Update dbl_list functionality

Reviewed-on: #2
Co-authored-by: Abdelrahman <said.abdelrahman89@gmail.com>
Co-committed-by: Abdelrahman <said.abdelrahman89@gmail.com>

.gitignore

@@ -3,8 +3,11 @@
 test
 test.*
 *.dSYM
+.DS_Store
 *.pdb
 *.obj
 compile_commands.json
 libwapp-build
 libwapp.so
+*.vs
+__pycache__

Makefile

@@ -0,0 +1,63 @@
+CC           = clang
+BUILD_TYPE   = debug
+CFLAGS       = -Wall -Wextra -Werror -pedantic
+LIBFLAGS     = -fPIC -shared
+KERNEL       = $(shell uname -s)
+MACHINE      = $(shell uname -m)
+PLATFORM     = $(KERNEL)_$(MACHINE)
+TEST_INCLUDE = -Isrc $(shell find tests -type d | xargs -I{} echo -n "-I{} ")
+TEST_SRC     = src/wapp.c $(shell find tests -type f -name "*.c" | xargs -I{} echo -n "{} ")
+BUILD_DIR    = libwapp-build/$(PLATFORM)-$(BUILD_TYPE)
+LIB_OUT      = $(BUILD_DIR)/libwapp.so
+TEST_OUT     = $(BUILD_DIR)/wapptest
+
+ifeq ($(BUILD_TYPE),debug)
+	CFLAGS += -g -fsanitize=address,undefined
+else ifeq ($(BUILD_TYPE),release)
+	CFLAGS += -O3
+else
+	$(error Invalid BUILD type '$(BUILD_TYPE)'. Use 'debug' or 'release')
+endif
+
+ifeq ($(CC),gcc)
+  # Used to disable the "ASan runtime does not come first in initial library list" error when compiling with gcc
+  export ASAN_OPTIONS=verify_asan_link_order=0
+endif
+
+.PHONY: all clean builddir build-test run-test build-lib full prng testing uuid core containers
+
+all: clean builddir run-test full
+
+clean:
+	@rm -rf $(BUILD_DIR)
+
+builddir:
+	@mkdir -p $(BUILD_DIR)
+
+build-test:
+	$(CC) $(CFLAGS) $(TEST_INCLUDE) $(TEST_SRC) -o $(TEST_OUT)
+
+run-test: build-test
+	@$(TEST_OUT)
+	@rm $(TEST_OUT)
+
+build-lib:
+	$(CC) $(CFLAGS) $(LIBFLAGS) $(LIB_SRC) -o $(LIB_OUT)
+
+full: LIB_SRC = src/wapp.c
+full: build-lib
+
+prng: LIB_SRC = src/prng/wapp_prng.c
+prng: build-lib
+
+testing: LIB_SRC = src/testing/wapp_testing.c
+testing: build-lib
+
+uuid: LIB_SRC = src/uuid/wapp_uuid.c
+uuid: build-lib
+
+core: LIB_SRC = src/core/wapp_core.c
+core: build-lib
+
+containers: LIB_SRC = src/core/wapp_containers.c
+containers: build-lib

build

@@ -1,3 +1,20 @@
 #!/bin/bash
 
-bear -- ./compile $@
+BUILD_TYPE="debug"
+ARGS=""
+
+while [[ $# > 0 ]];do
+  case $1 in
+    --release)
+      BUILD_TYPE="release"
+      shift
+      ;;
+    *|-*|--*)
+      rest=("$@")
+      ARGS+=" ${rest[0]}"
+      shift
+      ;;
+  esac
+done
+
+bear -- make BUILD_TYPE=$BUILD_TYPE $ARGS

build.ps1

@@ -1,5 +1,5 @@
 Param(
-	[switch]$Release
+  [switch]$Release
 )
 
 $Compiler = "cl.exe"
@@ -7,21 +7,25 @@ $Compiler = "cl.exe"
 $GeneralFlags = "/Wall /WX /wd4996"
 $LibraryFlags = "/LD"
 
-$IncludeDirs = Get-ChildItem -Path src -Recurse -Directory -ErrorAction SilentlyContinue -Force | %{$("/I " + '"' + $_.FullName + '"')}
-$SrcFiles = Get-ChildItem -Path src -Recurse -Filter *.c -ErrorAction SilentlyContinue -Force | %{$('"' + $_.FullName + '"')}
+$Kernel = (Get-ChildItem Env:OS).Value
+$Machine = (Get-ChildItem Env:PROCESSOR_ARCHITECTURE).Value
+$Platform = "${Kernel}_${Machine}"
+
+$IncludeDirs = "/I src"
+$SrcFiles = "src/wapp.c"
 
 $TestIncludeDirs = Get-ChildItem -Path tests -Recurse -Directory -ErrorAction SilentlyContinue -Force | %{$("/I " + '"' + $_.FullName + '"')}
 $TestSrcFiles = Get-ChildItem -Path tests -Recurse -Filter *.c -ErrorAction SilentlyContinue -Force | %{$('"' + $_.FullName + '"')}
 
 If ($Release -eq $True) {
-	$GeneralFlags += " /O2 /Og"
-	$BuildType = "release"
+  $GeneralFlags += " /O2 /Og"
+  $BuildType = "release"
 } Else {
-	$GeneralFlags += " /Zi /Od /fsanitize=address"
-	$BuildType = "debug"
+  $GeneralFlags += " /Zi /Od /fsanitize=address"
+  $BuildType = "debug"
 }
 
-$BuildDir = "./libwapp-build/windows-$BuildType"
+$BuildDir = "./libwapp-build/${Platform}-${BuildType}"
 $ObjDir = "$BuildDir/objects"
 $OutDir = "$BuildDir/output"
 $TestsDir = "$BuildDir/tests"
@@ -34,13 +38,16 @@ $TestOutBasename = "wapptest"
 $TestOutputs = "/Fo:$TestsDir/ /Fe:$TestsDir/$TestOutBasename"
 
 If (Test-Path $BuildDir) {
-	Remove-Item $BuildDir -Recurse -Force
+  Remove-Item $BuildDir -Recurse -Force
 }
 
 mkdir -p $ObjDir > $null
 mkdir -p $OutDir > $null
 mkdir -p $TestsDir > $null
 
+# Run code generation
+Invoke-Expression "python3 -m codegen"
+
 # Build and run tests
 Invoke-Expression "$Compiler $GeneralFlags $IncludeDirs $TestIncludeDirs $SrcFiles $TestSrcFiles $TestOutputs" -ErrorAction Stop
 
@@ -50,9 +57,9 @@ $Status = $LASTEXITCODE
 Remove-Item $TestsDir -Recurse -Force
 
 If ($Status -ne 0) {
-	Write-Error "Tests failed"
-	Exit 1
+  Write-Error "Tests failed"
+  Exit 1
 }
 
 # Build library
-Invoke-Expression "$Compiler $GeneralFlags $LibraryFlags $IncludeDirs $SrcFiles $Objects $Outputs"
+Invoke-Expression "$Compiler $GeneralFlags $LibraryFlags $SrcFiles $Objects $Outputs"

compile

@@ -1,61 +0,0 @@
-#!/bin/bash
-
-BUILD_TYPE="debug"
-
-while [[ $# > 0 ]];do
-  case $1 in
-    --release)
-      BUILD_TYPE="release"
-      shift
-      ;;
-    *|-*|--*)
-      echo "Unknown option $1"
-      exit 1
-      ;;
-  esac
-done
-
-CC=clang
-CFLAGS="-Wall -Werror -pedantic "
-LIBFLAGS="-fPIC -shared"
-
-INCLUDE="$(find src -type d | xargs -I{} echo -n "-I{} ")"
-SRC="$(find src -type f -name "*.c" | xargs -I{} echo -n "{} ")"
-
-TEST_INCLUDE="$(find tests -type d | xargs -I{} echo -n "-I{} ")"
-TEST_SRC="$(find tests -type f -name "*.c" | xargs -I{} echo -n "{} ")"
-
-BUILD_DIR="libwapp-build/posix-$BUILD_TYPE"
-if [[ -d $BUILD_DIR ]]; then
-	rm -rf $BUILD_DIR
-fi
-mkdir -p $BUILD_DIR
-
-if [[ $BUILD_TYPE == "release" ]]; then
-  CFLAGS+="-O3"
-else
-  CFLAGS+="-g -fsanitize=address -fsanitize=undefined"
-fi
-
-OUT="$BUILD_DIR/libwapp.so"
-TEST_OUT="$BUILD_DIR/wapptest"
-
-# Compile tests
-if [[ $(echo $TEST_SRC | xargs) != "" ]]; then
-  (set -x ; $CC $CFLAGS $INCLUDE $TEST_INCLUDE $SRC $TEST_SRC -o $TEST_OUT)
-fi
-
-# Run tests and exit on failure
-if [[ -f $TEST_OUT ]]; then
-  $TEST_OUT
-  STATUS="$?"
-
-  rm $TEST_OUT
-
-  if [[ $STATUS != "0" ]]; then
-    exit 1
-  fi
-fi
-
-# Compile library
-(set -x ; $CC $CFLAGS $LIBFLAGS $INCLUDE $SRC -o $OUT)

src/common/aliases/aliases.h

@@ -3,6 +3,10 @@
 
 #include <stdint.h>
 
+#define c8 uint8_t
+#define c16 uint16_t
+#define c32 uint32_t
+
 #define u8 uint8_t
 #define u16 uint16_t
 #define u32 uint32_t
@@ -20,11 +24,14 @@
 #define uptr uintptr_t
 #define iptr intptr_t
 
+#define external extern
 #define internal static
 #define persistent static
 
 #ifdef __cplusplus
 #define class_mem static
+#define BEGIN_C_LINKAGE extern "C" {
+#define END_C_LINKAGE }
 #endif // __cplusplus
 
 #endif // !ALIASES_H

src/common/mem_utils/mem_utils.c

@@ -1,115 +0,0 @@
-#include "mem_utils.h"
-#include "aliases.h"
-#include "platform.h"
-#include <assert.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-
-#if defined(WAPP_PLATFORM_WINDOWS)
-#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
-#include <memoryapi.h>
-
-internal const i32 access_types[] = {
-    [WAPP_MEM_ACCESS_NONE] = PAGE_NOACCESS,
-    [WAPP_MEM_ACCESS_READ_ONLY] = PAGE_READONLY,
-    [WAPP_MEM_ACCESS_EXEC_ONLY] = PAGE_EXECUTE,
-    [WAPP_MEM_ACCESS_READ_WRITE] = PAGE_READWRITE,
-    [WAPP_MEM_ACCESS_READ_EXEC] = PAGE_EXECUTE_READ,
-    [WAPP_MEM_ACCESS_READ_WRITE_EXEC] = PAGE_EXECUTE_READWRITE,
-};
-
-internal inline void *alloc_windows(void *addr, u64 size, MemAccess access,
-                                    MemAllocFlags flags);
-#elif defined(WAPP_PLATFORM_POSIX)
-#include <sys/mman.h>
-
-internal const i32 access_types[] = {
-    [WAPP_MEM_ACCESS_NONE] = PROT_NONE,
-    [WAPP_MEM_ACCESS_READ_ONLY] = PROT_READ,
-    [WAPP_MEM_ACCESS_EXEC_ONLY] = PROT_EXEC,
-    [WAPP_MEM_ACCESS_READ_WRITE] = PROT_READ | PROT_WRITE,
-    [WAPP_MEM_ACCESS_READ_EXEC] = PROT_READ | PROT_EXEC,
-    [WAPP_MEM_ACCESS_READ_WRITE_EXEC] = PROT_READ | PROT_WRITE | PROT_EXEC,
-};
-
-internal inline void *alloc_posix(void *addr, u64 size, MemAccess access,
-                                  MemAllocFlags flags);
-#else
-#error "Unrecognised platform"
-#endif
-
-internal bool is_power_of_two(u64 num) { return (num & (num - 1)) == 0; }
-
-void *wapp_mem_util_align_forward(void *ptr, u64 alignment) {
-  if (!ptr) {
-    return NULL;
-  }
-
-  assert(is_power_of_two(alignment));
-
-  uptr p = (uptr)ptr;
-  uptr align = (uptr)alignment;
-
-  // Similar to p % align, but it's a faster implementation that works fine
-  // because align is guaranteed to be a power of 2
-  uptr modulo = p & (align - 1);
-
-  if (modulo != 0) {
-    p += align - modulo;
-  }
-
-  return (void *)p;
-}
-
-void *wapp_mem_util_alloc(void *addr, u64 size, MemAccess access,
-                          MemAllocFlags flags, MemInitType type) {
-#if defined(WAPP_PLATFORM_WINDOWS)
-  // Ensure memory is committed if it's meant to be initialised
-  if (type == WAPP_MEM_INIT_INITIALISED) {
-    flags |= WAPP_MEM_ALLOC_COMMIT;
-  }
-
-  void *output = alloc_windows(addr, size, access, flags);
-#elif defined(WAPP_PLATFORM_POSIX)
-  void *output = alloc_posix(addr, size, access, flags);
-#else
-  return NULL;
-#endif
-
-  if (type == WAPP_MEM_INIT_INITIALISED) {
-    memset(output, 0, size);
-  }
-
-  return output;
-}
-
-void wapp_mem_util_free(void *ptr, u64 size) {
-#if defined(WAPP_PLATFORM_WINDOWS)
-  VirtualFree(ptr, size, MEM_RELEASE);
-#elif defined(WAPP_PLATFORM_POSIX)
-  munmap(ptr, size);
-#endif
-}
-
-#ifdef WAPP_PLATFORM_WINDOWS
-internal inline void *alloc_windows(void *addr, u64 size, MemAccess access,
-                                    MemAllocFlags flags) {
-  return VirtualAlloc(addr, (SIZE_T)size, flags, access_types[access]);
-}
-#endif
-
-#if defined(WAPP_PLATFORM_POSIX)
-internal inline void *alloc_posix(void *addr, u64 size, MemAccess access,
-                                  MemAllocFlags flags) {
-  i32 alloc_flags = flags | MAP_ANON | MAP_PRIVATE;
-
-#if defined(WAPP_PLATFORM_LINUX) || defined(WAPP_PLATFORM_GNU) ||              \
-    defined(WAPP_PLATFORM_NET_BSD)
-  alloc_flags |= MAP_NORESERVE;
-#endif
-
-  return mmap(addr, size, access_types[access], alloc_flags, -1, 0);
-}
-#endif

src/common/mem_utils/mem_utils.h

@@ -1,61 +0,0 @@
-#ifndef MEM_UTILS_H
-#define MEM_UTILS_H
-
-#include "aliases.h"
-#include "platform.h"
-
-#if defined(WAPP_PLATFORM_WINDOWS)
-#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
-#include <memoryapi.h>
-#elif defined(WAPP_PLATFORM_POSIX)
-#include <sys/mman.h>
-#else
-#error "Unrecognised platform"
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
-
-typedef enum mem_access {
-  WAPP_MEM_ACCESS_NONE,
-  WAPP_MEM_ACCESS_READ_ONLY,
-  WAPP_MEM_ACCESS_EXEC_ONLY,
-  WAPP_MEM_ACCESS_READ_WRITE,
-  WAPP_MEM_ACCESS_READ_EXEC,
-  WAPP_MEM_ACCESS_READ_WRITE_EXEC,
-} MemAccess;
-
-typedef enum mem_alloc_flags {
-#if defined(WAPP_PLATFORM_WINDOWS)
-  WAPP_MEM_ALLOC_RESERVE = MEM_RESERVE,
-  WAPP_MEM_ALLOC_COMMIT = MEM_COMMIT,
-#elif defined(WAPP_PLATFORM_LINUX) || defined(WAPP_PLATFORM_GNU)
-  WAPP_MEM_ALLOC_RESERVE = 0,
-  WAPP_MEM_ALLOC_COMMIT = MAP_POPULATE,
-#elif defined(WAPP_PLATFORM_FREE_BSD)
-  WAPP_MEM_ALLOC_RESERVE = 0,
-  WAPP_MEM_ALLOC_COMMIT = MAP_PREFAULT_READ,
-#elif defined(WAPP_PLATFORM_BSD) || defined(WAPP_PLATFORM_UNIX) ||             \
-    defined(WAPP_PLATFORM_APPLE)
-  WAPP_MEM_ALLOC_RESERVE = 0,
-  WAPP_MEM_ALLOC_COMMIT = 0,
-#endif
-} MemAllocFlags;
-
-typedef enum mem_init_type {
-  WAPP_MEM_INIT_UNINITIALISED,
-  WAPP_MEM_INIT_INITIALISED,
-} MemInitType;
-
-void *wapp_mem_util_align_forward(void *ptr, u64 alignment);
-void *wapp_mem_util_alloc(void *addr, u64 size, MemAccess access,
-                          MemAllocFlags flags, MemInitType type);
-void wapp_mem_util_free(void *ptr, u64 size);
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-
-#endif // !MEM_UTILS_H

src/common/misc/misc_utils.h

@@ -1,9 +1,13 @@
 #ifndef MISC_UTILS_H
 #define MISC_UTILS_H
 
-#include "aliases.h"
+#include "../aliases/aliases.h"
 
-#define wapp_misc_utils_padding_size(SIZE)                                     \
-  u8 reserved_padding[sizeof(void *) - ((SIZE) % sizeof(void *))]
+#define KB(SIZE) (SIZE * 1024ull)
+#define MB(SIZE) (KB(SIZE) * 1024)
+#define GB(SIZE) (MB(SIZE) * 1024)
+#define TB(SIZE) (GB(SIZE) * 1024)
+
+#define wapp_misc_utils_padding_size(SIZE) u8 reserved_padding[sizeof(void *) - ((SIZE) % sizeof(void *))]
 
 #endif // !MISC_UTILS_H

src/common/platform/platform.h

@@ -1,7 +1,6 @@
 #ifndef PLATFORM_H
 #define PLATFORM_H
 
-// clang-format off
 #if defined(__ANDROID__)
   #define WAPP_PLATFORM_ANDROID
   #define WAPP_PLATFORM_POSIX
@@ -58,6 +57,5 @@
 #else
   #error "Unrecognised platform"
 #endif
-// clang-format on
 
 #endif // !PLATFORM_H

src/common/shell/commander/commander.c

@@ -1,132 +0,0 @@
-#include "commander.h"
-#include "aliases.h"
-#include "shell_utils.h"
-#include <stdarg.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define CMD_BUF_LEN 8192
-#define OUT_BUF_LEN 4096
-
-internal inline CMDError build_command_from_args(char *cmd, u64 buf_len,
-                                                 va_list args);
-internal inline CMDResult execute_command(const char *cmd,
-                                          CMDOutHandling out_handling,
-                                          char *out_buf, u64 buf_size);
-internal inline CMDError get_command_output(FILE *fp,
-                                            CMDOutHandling out_handling,
-                                            char *out_buf, u64 buf_size);
-internal inline CMDError get_output_status(FILE *fp, i32 *status_out);
-
-// clang-format off
-CMDResult run_command(CMDOutHandling out_handling, char *out_buf, u64 buf_size, ...) { // clang-format on
-  va_list args;
-  va_start(args, buf_size);
-
-  char cmd[CMD_BUF_LEN] = {0};
-  CMDError err = build_command_from_args(cmd, CMD_BUF_LEN, args);
-  if (err > SHELL_ERR_NO_ERROR) {
-    va_end(args);
-    return CMD_NO_EXIT(err);
-  }
-
-  va_end(args);
-
-  return execute_command(cmd, out_handling, out_buf, buf_size);
-}
-
-internal inline CMDError build_command_from_args(char *cmd, u64 buf_len,
-                                                 va_list args) {
-  u64 size = 0;
-  u64 arg_len = 0;
-
-  const char *arg;
-  while ((arg = va_arg(args, const char *))) {
-    arg_len = strlen(arg);
-    if (arg_len >= buf_len - size) {
-      return SHELL_ERR_CMD_BUF_FULL;
-    }
-
-    strcat(cmd, arg);
-    cmd[size + arg_len] = ' ';
-
-    size += arg_len + 1;
-  }
-
-  return SHELL_ERR_NO_ERROR;
-}
-
-internal inline CMDResult execute_command(const char *cmd,
-                                          CMDOutHandling out_handling,
-                                          char *out_buf, u64 buf_size) {
-  FILE *fp = wapp_shell_utils_popen(cmd, "r");
-  if (!fp) {
-    return CMD_NO_EXIT(SHELL_ERR_PROC_START_FAIL);
-  }
-
-  CMDError err = get_command_output(fp, out_handling, out_buf, buf_size);
-  if (err > SHELL_ERR_NO_ERROR) {
-    // Ensure process is closed on failure
-    wapp_shell_utils_pclose(fp);
-    return CMD_NO_EXIT(err);
-  }
-
-  i32 st = EXIT_SUCCESS;
-  err = get_output_status(fp, &st);
-  if (err > SHELL_ERR_NO_ERROR) {
-    return CMD_NO_EXIT(err);
-  }
-
-  return (CMDResult){
-      .exited = true,
-      .exit_code = st,
-      .error = SHELL_ERR_NO_ERROR,
-  };
-}
-
-internal inline CMDError get_command_output(FILE *fp,
-                                            CMDOutHandling out_handling,
-                                            char *out_buf, u64 buf_size) {
-  char out[OUT_BUF_LEN] = {0};
-  u64 max_out_length = OUT_BUF_LEN - 1;
-
-  u64 buf_filled = 0;
-  while (fgets(out, max_out_length, fp)) {
-    if (out_handling == SHELL_OUTPUT_CAPTURE && out_buf != NULL) {
-      buf_filled += strlen(out);
-      if (buf_filled >= buf_size) {
-        return SHELL_ERR_OUT_BUF_FULL;
-      }
-
-      strcat(out_buf, out);
-    } else {
-      printf("%s", out);
-    }
-  }
-
-  return SHELL_ERR_NO_ERROR;
-}
-
-internal inline CMDError get_output_status(FILE *fp, i32 *status_out) {
-#ifdef WAPP_PLATFORM_WINDOWS
-  if (!feof(fp)) {
-    // Ensure process is closed on failure
-    wapp_shell_utils_pclose(fp);
-    return SHELL_ERR_PROC_EXIT_FAIL;
-  }
-#endif /* ifdef WAPP_PLATFORM_WINDOWS */
-
-  *status_out = wapp_shell_utils_pclose(fp);
-
-#ifdef WAPP_PLATFORM_POSIX
-  if (!WIFEXITED(*status_out)) {
-    return SHELL_ERR_PROC_EXIT_FAIL;
-  }
-
-  *status_out = WEXITSTATUS(*status_out);
-#endif /* ifdef WAPP_PLATFORM_WINDOWS */
-
-  return SHELL_ERR_NO_ERROR;
-}

src/common/shell/commander/commander.h

@@ -1,45 +0,0 @@
-#ifndef COMMANDER_H
-#define COMMANDER_H
-
-#include "aliases.h"
-#include <stdbool.h>
-#include <stdlib.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
-
-#define CMD_NO_EXIT(ERR)                                                       \
-  ((CMDResult){.exited = false, .exit_code = EXIT_FAILURE})
-#define wapp_shell_commander_execute(HANDLE_OUTPUT, OUT_BUF, BUF_SIZE, ...)    \
-  run_command(HANDLE_OUTPUT, OUT_BUF, BUF_SIZE, __VA_ARGS__, NULL)
-
-typedef enum {
-  SHELL_OUTPUT_PRINT,
-  SHELL_OUTPUT_CAPTURE,
-} CMDOutHandling;
-
-typedef enum {
-  SHELL_ERR_NO_ERROR,
-  SHELL_ERR_CMD_BUF_FULL,
-  SHELL_ERR_PROC_START_FAIL,
-  SHELL_ERR_OUT_BUF_FULL,
-  SHELL_ERR_PROC_EXIT_FAIL,
-} CMDError;
-
-typedef struct commander_result CMDResult;
-struct commander_result {
-  bool exited;
-  int exit_code;
-  CMDError error;
-};
-
-// clang-format off
-CMDResult run_command(CMDOutHandling out_handling, char *out_buf, u64 buf_size, ...);
-// clang-format on
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-
-#endif // !COMMANDER_H

src/common/shell/termcolour/termcolour.c

@@ -1,101 +0,0 @@
-#include "termcolour.h"
-#include "aliases.h"
-#include "platform.h"
-#include <stdio.h>
-
-internal void print_coloured_text(const TerminalColourist *colourist,
-                                  const char *text);
-
-#ifdef WAPP_PLATFORM_WINDOWS
-#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
-
-internal WORD colours[COUNT_TERM_COLOUR] = {
-    [WAPP_TERM_COLOUR_FG_BLACK] = 0,
-    [WAPP_TERM_COLOUR_FG_RED] = FOREGROUND_RED,
-    [WAPP_TERM_COLOUR_FG_GREEN] = FOREGROUND_GREEN,
-    [WAPP_TERM_COLOUR_FG_BLUE] = FOREGROUND_BLUE,
-    [WAPP_TERM_COLOUR_FG_CYAN] = FOREGROUND_GREEN | FOREGROUND_BLUE,
-    [WAPP_TERM_COLOUR_FG_MAGENTA] = FOREGROUND_RED | FOREGROUND_BLUE,
-    [WAPP_TERM_COLOUR_FG_YELLOW] = FOREGROUND_RED | FOREGROUND_GREEN,
-    [WAPP_TERM_COLOUR_FG_WHITE] =
-        FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE,
-    [WAPP_TERM_COLOUR_FG_BR_BLACK] = FOREGROUND_INTENSITY,
-    [WAPP_TERM_COLOUR_FG_BR_RED] = FOREGROUND_RED | FOREGROUND_INTENSITY,
-    [WAPP_TERM_COLOUR_FG_BR_GREEN] = FOREGROUND_GREEN | FOREGROUND_INTENSITY,
-    [WAPP_TERM_COLOUR_FG_BR_BLUE] = FOREGROUND_BLUE | FOREGROUND_INTENSITY,
-    [WAPP_TERM_COLOUR_FG_BR_CYAN] =
-        FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY,
-    [WAPP_TERM_COLOUR_FG_BR_MAGENTA] =
-        FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_INTENSITY,
-    [WAPP_TERM_COLOUR_FG_BR_YELLOW] =
-        FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_INTENSITY,
-    [WAPP_TERM_COLOUR_FG_BR_WHITE] = FOREGROUND_RED | FOREGROUND_GREEN |
-                                     FOREGROUND_BLUE | FOREGROUND_INTENSITY,
-};
-#else
-internal const char *colours[COUNT_TERM_COLOUR] = {
-    [WAPP_TERM_COLOUR_FG_BLACK] = "\033[30m",
-    [WAPP_TERM_COLOUR_FG_RED] = "\033[31m",
-    [WAPP_TERM_COLOUR_FG_GREEN] = "\033[32m",
-    [WAPP_TERM_COLOUR_FG_BLUE] = "\033[34m",
-    [WAPP_TERM_COLOUR_FG_CYAN] = "\033[36m",
-    [WAPP_TERM_COLOUR_FG_MAGENTA] = "\033[35m",
-    [WAPP_TERM_COLOUR_FG_YELLOW] = "\033[33m",
-    [WAPP_TERM_COLOUR_FG_WHITE] = "\033[37m",
-    [WAPP_TERM_COLOUR_FG_BR_BLACK] = "\033[90m",
-    [WAPP_TERM_COLOUR_FG_BR_RED] = "\033[91m",
-    [WAPP_TERM_COLOUR_FG_BR_GREEN] = "\033[92m",
-    [WAPP_TERM_COLOUR_FG_BR_BLUE] = "\033[94m",
-    [WAPP_TERM_COLOUR_FG_BR_CYAN] = "\033[96m",
-    [WAPP_TERM_COLOUR_FG_BR_MAGENTA] = "\033[95m",
-    [WAPP_TERM_COLOUR_FG_BR_YELLOW] = "\033[93m",
-    [WAPP_TERM_COLOUR_FG_BR_WHITE] = "\033[97m",
-};
-#endif /* ifdef WAPP_PLATFORM_WINDOWS */
-
-TerminalColourist wapp_shell_termcolour_get_colourist(void) {
-  TerminalColourist colourist;
-
-#ifdef WAPP_PLATFORM_WINDOWS
-  // create handle
-  colourist.handle = GetStdHandle(STD_OUTPUT_HANDLE);
-
-  // get console colour information
-  CONSOLE_SCREEN_BUFFER_INFO csbi;
-  GetConsoleScreenBufferInfo(colourist.handle, &csbi);
-  colourist.default_colour = csbi.wAttributes;
-#else
-  colourist.default_colour = "\033[0m";
-#endif // ifdef WAPP_PLATFORM_WINDOWS
-
-  colourist.current_colour = colourist.default_colour;
-
-  return colourist;
-}
-
-void wapp_shell_termcolour_print_text(TerminalColourist *colourist,
-                                      const char *text, TerminalColour colour) {
-  if (colour < WAPP_TERM_COLOUR_FG_BLACK ||
-      colour > WAPP_TERM_COLOUR_FG_BR_WHITE) {
-    return;
-  }
-
-  colourist->current_colour = colours[colour];
-  print_coloured_text(colourist, text);
-}
-
-void wapp_shell_termcolour_clear_colour(TerminalColourist *colourist) {
-  colourist->current_colour = colourist->default_colour;
-  print_coloured_text(colourist, "");
-}
-
-internal void print_coloured_text(const TerminalColourist *colourist,
-                                  const char *text) {
-#ifdef WAPP_PLATFORM_WINDOWS
-  SetConsoleTextAttribute(colourist->handle, colourist->current_colour);
-  printf("%s", text);
-#else
-  printf("%s%s", colourist->current_colour, text);
-#endif // ifdef WAPP_PLATFORM_WINDOWS
-}

src/common/shell/termcolour/termcolour.h

@@ -1,64 +0,0 @@
-#ifndef TERM_COLOUR_H
-#define TERM_COLOUR_H
-
-#include "aliases.h"
-#include "misc_utils.h"
-#include "platform.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
-
-typedef enum {
-  WAPP_TERM_COLOUR_FG_BLACK,
-  WAPP_TERM_COLOUR_FG_RED,
-  WAPP_TERM_COLOUR_FG_GREEN,
-  WAPP_TERM_COLOUR_FG_BLUE,
-  WAPP_TERM_COLOUR_FG_CYAN,
-  WAPP_TERM_COLOUR_FG_MAGENTA,
-  WAPP_TERM_COLOUR_FG_YELLOW,
-  WAPP_TERM_COLOUR_FG_WHITE,
-  WAPP_TERM_COLOUR_FG_BR_BLACK,
-  WAPP_TERM_COLOUR_FG_BR_RED,
-  WAPP_TERM_COLOUR_FG_BR_GREEN,
-  WAPP_TERM_COLOUR_FG_BR_BLUE,
-  WAPP_TERM_COLOUR_FG_BR_CYAN,
-  WAPP_TERM_COLOUR_FG_BR_MAGENTA,
-  WAPP_TERM_COLOUR_FG_BR_YELLOW,
-  WAPP_TERM_COLOUR_FG_BR_WHITE,
-
-  COUNT_TERM_COLOUR,
-} TerminalColour;
-
-typedef struct terminal_colourist TerminalColourist;
-
-// clang-format off
-#ifdef WAPP_PLATFORM_WINDOWS
-#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
-#include <WinCon.h>
-
-struct terminal_colourist {
-  HANDLE handle;
-  WORD default_colour;
-  WORD current_colour;
-  wapp_misc_utils_padding_size(sizeof(HANDLE) + sizeof(WORD) + sizeof(WORD));
-};
-#else
-struct terminal_colourist {
-  const char *default_colour;
-  const char *current_colour;
-};
-#endif // WAPP_PLATFORM_WINDOWS
-// clang-format on
-
-TerminalColourist wapp_shell_termcolour_get_colourist(void);
-void wapp_shell_termcolour_print_text(TerminalColourist *colourist,
-                                      const char *text, TerminalColour colour);
-void wapp_shell_termcolour_clear_colour(TerminalColourist *colourist);
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-
-#endif // !TERM_COLOUR_H

src/common/wapp_common.h

@@ -0,0 +1,8 @@
+#ifndef WAPP_COMMON_H
+#define WAPP_COMMON_H
+
+#include "aliases/aliases.h"
+#include "misc/misc_utils.h"
+#include "platform/platform.h"
+
+#endif // !WAPP_COMMON_H

src/containers/dbl_list/dbl_list.c

@@ -0,0 +1,209 @@
+#include "./dbl_list.h"
+#include "../../common/aliases/aliases.h"
+#include <stddef.h>
+
+internal DBL_LIST(void) node_to_list(DBL_NODE(void) *node);
+
+DBL_NODE(void) *_dbl_list_get(const DBL_LIST(void) *list, u64 index) {
+  if (index >= list->node_count) {
+    return NULL;
+  }
+
+  DBL_NODE(void) *output  = NULL;
+  DBL_NODE(void) *current = list->first;
+  for (u64 i = 1; i <= index; ++i) {
+    current = current->next;
+  }
+
+  output = current;
+
+  return output;
+
+}
+
+void _dbl_list_push_front(DBL_LIST(void) *list, DBL_NODE(void) *node) {
+  if (!list || !node || !(node->item)) {
+    return;
+  }
+
+  DBL_LIST(void) node_list = node_to_list(node);
+
+  if (list->node_count == 0) {
+    *list = node_list;
+    return;
+  }
+
+  list->node_count += node_list.node_count;
+
+  DBL_NODE(void) *first = list->first;
+  if (first) {
+    first->prev = node_list.last;
+  }
+
+  list->first = node_list.first;
+  node_list.last->next = first;
+
+}
+
+void _dbl_list_push_back(DBL_LIST(void) *list, DBL_NODE(void) *node) {
+  if (!list || !node || !(node->item)) {
+    return;
+  }
+
+  DBL_LIST(void) node_list = node_to_list(node);
+
+  if (list->node_count == 0) {
+    *list = node_list;
+    return;
+  }
+
+  list->node_count += node_list.node_count;
+
+  DBL_NODE(void) *last = list->last;
+  if (last) {
+    last->next = node_list.first;
+  }
+
+  list->last = node_list.last;
+  node_list.first->prev = last;
+
+}
+
+void _dbl_list_insert(DBL_LIST(void) *list, DBL_NODE(void) *node, u64 index) {
+  if (!list || !node || !(node->item)) {
+    return;
+  }
+
+  if (index == 0) {
+    _dbl_list_push_front(list, node);
+    return;
+  } else if (index == list->node_count) {
+    _dbl_list_push_back(list, node);
+    return;
+  }
+
+  DBL_NODE(void) *dst_node = _dbl_list_get(list, index);
+  if (!dst_node) {
+    return;
+  }
+
+  DBL_LIST(void) node_list = node_to_list(node);
+
+  list->node_count += node_list.node_count;
+
+  DBL_NODE(void) *prev = dst_node->prev;
+
+  dst_node->prev = node_list.last;
+  prev->next     = node_list.first;
+
+  node_list.first->prev = prev;
+  node_list.last->next  = dst_node;
+
+}
+
+DBL_NODE(void) *_dbl_list_pop_front(DBL_LIST(void) *list) {
+  DBL_NODE(void) *output = NULL;
+
+  if (!list || list->node_count == 0) {
+    goto RETURN_STR8_LIST_POP_FRONT;
+  }
+
+  output = list->first;
+
+  if (list->node_count == 1) {
+    *list = (DBL_LIST(void)){0};
+    goto RETURN_STR8_LIST_POP_FRONT;
+  }
+
+  --(list->node_count);
+  list->first = output->next;
+
+  output->prev = output->next = NULL;
+
+RETURN_STR8_LIST_POP_FRONT:
+  return output;
+
+}
+
+DBL_NODE(void) *_dbl_list_pop_back(DBL_LIST(void) *list) {
+  DBL_NODE(void) *output = NULL;
+
+  if (!list || list->node_count == 0) {
+    goto RETURN_STR8_LIST_POP_BACK;
+  }
+
+  output = list->last;
+
+  if (list->node_count == 1) {
+    *list = (DBL_LIST(void)){0};
+    goto RETURN_STR8_LIST_POP_BACK;
+  }
+
+  --(list->node_count);
+  list->last = output->prev;
+
+  output->prev = output->next = NULL;
+
+RETURN_STR8_LIST_POP_BACK:
+  return output;
+
+}
+
+DBL_NODE(void) *_dbl_list_remove(DBL_LIST(void) *list, u64 index) {
+  DBL_NODE(void) *output = NULL;
+  if (!list) {
+    goto RETURN_STR8_LIST_REMOVE;
+  }
+
+  if (index == 0) {
+    output = _dbl_list_pop_front(list);
+    goto RETURN_STR8_LIST_REMOVE;
+  } else if (index == list->node_count) {
+    output = _dbl_list_pop_back(list);
+    goto RETURN_STR8_LIST_REMOVE;
+  }
+
+  output = _dbl_list_get(list, index);
+  if (!output) {
+    goto RETURN_STR8_LIST_REMOVE;
+  }
+
+  output->prev->next = output->next;
+  output->next->prev = output->prev;
+
+  --(list->node_count);
+
+  output->prev = output->next = NULL;
+
+RETURN_STR8_LIST_REMOVE:
+  return output;
+
+}
+
+void _dbl_list_empty(DBL_LIST(void) *list) {
+  if (!list) {
+    return;
+  }
+
+  u64 count = list->node_count;
+  for (u64 i = 0; i < count; ++i) {
+    _dbl_list_pop_back(list);
+  }
+
+}
+
+internal DBL_LIST(void) node_to_list(DBL_NODE(void) *node) {
+  DBL_LIST(void) output = {.first = node, .last = node, .node_count = 1};
+
+  while (output.first->prev != NULL) {
+    output.first = output.first->prev;
+    ++(output.node_count);
+  }
+
+  while (output.last->next != NULL) {
+    output.last = output.last->next;
+    ++(output.node_count);
+  }
+
+  return output;
+}

src/containers/dbl_list/dbl_list.h

@@ -0,0 +1,75 @@
+#ifndef DBL_LIST_H
+#define DBL_LIST_H
+
+#include "../../common/aliases/aliases.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // !__cplusplus
+
+#define DBL_NODE(T) T##Node
+#define DBL_LIST(T) T##List
+
+#define CAST_NODE(NODE) ((DBL_NODE(void))(NODE))
+#define CAST_LIST(LIST) ((DBL_LIST(void))(LIST))
+
+#define CAST_NODE_PTR(NODE_PTR) ((DBL_NODE(void)*)(NODE_PTR))
+#define CAST_LIST_PTR(LIST_PTR) ((DBL_LIST(void)*)(LIST_PTR))
+
+#define DBL_LIST_DECL(T) typedef struct DBL_NODE(T) DBL_NODE(T); \
+  struct DBL_NODE(T) {                                           \
+    T *item;                                                     \
+    DBL_NODE(T) *prev;                                           \
+    DBL_NODE(T) *next;                                           \
+  };                                                             \
+                                                                 \
+  typedef struct DBL_LIST(T) DBL_LIST(T);                        \
+  struct DBL_LIST(T) {                                           \
+    DBL_NODE(T) *first;                                          \
+    DBL_NODE(T) *last;                                           \
+    u64 node_count;                                              \
+  }
+
+DBL_LIST_DECL(void);
+
+#define wapp_dbl_list_node_from_item(T, ITEM_PTR) \
+    ((DBL_NODE(T)){ .item = ITEM_PTR })
+
+#define wapp_dbl_list_get(T, LIST_PTR, INDEX) \
+    (DBL_NODE(T)*)_dbl_list_get(CAST_LIST_PTR(LIST_PTR), INDEX)
+
+#define wapp_dbl_list_push_front(LIST_PTR, NODE_PTR) \
+    _dbl_list_push_front(CAST_LIST_PTR(LIST_PTR), CAST_NODE_PTR(NODE_PTR))
+
+#define wapp_dbl_list_push_back(LIST_PTR, NODE_PTR) \
+    _dbl_list_push_back(CAST_LIST_PTR(LIST_PTR), CAST_NODE_PTR(NODE_PTR))
+
+#define wapp_dbl_list_insert(LIST_PTR, NODE_PTR, INDEX) \
+    _dbl_list_insert(CAST_LIST_PTR(LIST_PTR), CAST_NODE_PTR(NODE_PTR), INDEX)
+
+#define wapp_dbl_list_pop_front(T, LIST_PTR) \
+    (DBL_NODE(T)*)_dbl_list_pop_front(CAST_LIST_PTR(LIST_PTR))
+
+#define wapp_dbl_list_pop_back(T, LIST_PTR) \
+    (DBL_NODE(T)*)_dbl_list_pop_back(CAST_LIST_PTR(LIST_PTR))
+
+#define wapp_dbl_list_remove(T, LIST_PTR, INDEX) \
+    (DBL_NODE(T)*)_dbl_list_remove(CAST_LIST_PTR(LIST_PTR), INDEX)
+
+#define wapp_dbl_list_empty(LIST_PTR) \
+    _dbl_list_empty(CAST_LIST_PTR(LIST_PTR))
+
+DBL_NODE(void) *_dbl_list_get(const DBL_LIST(void) *list, u64 index);
+void            _dbl_list_push_front(DBL_LIST(void) *list, DBL_NODE(void) *node);
+void            _dbl_list_push_back(DBL_LIST(void) *list, DBL_NODE(void) *node);
+void            _dbl_list_insert(DBL_LIST(void) *list, DBL_NODE(void) *node, u64 index);
+DBL_NODE(void) *_dbl_list_pop_front(DBL_LIST(void) *list);
+DBL_NODE(void) *_dbl_list_pop_back(DBL_LIST(void) *list);
+DBL_NODE(void) *_dbl_list_remove(DBL_LIST(void) *list, u64 index);
+void            _dbl_list_empty(DBL_LIST(void) *list);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // !__cplusplus
+
+#endif // !DBL_LIST_H

src/containers/wapp_containers.c

@@ -0,0 +1,6 @@
+#ifndef WAPP_CONTAINERS_C
+#define WAPP_CONTAINERS_C
+
+#include "dbl_list/dbl_list.c"
+
+#endif // !WAPP_CONTAINERS_C

src/containers/wapp_containers.h

@@ -0,0 +1,7 @@
+#ifndef WAPP_CONTAINERS_H
+#define WAPP_CONTAINERS_H
+
+#include "dbl_list/dbl_list.h"
+#include "../common/wapp_common.h"
+
+#endif // !WAPP_CONTAINERS_H

src/core/cpath/cpath.c

@@ -1,87 +0,0 @@
-#include "cpath.h"
-#include "aliases.h"
-#include <stdarg.h>
-#include <stdio.h>
-#include <string.h>
-
-#if defined(__unix__) || defined(__APPLE__) || defined(__ANDROID__)
-internal char path_sep = '/';
-#elif defined(_WIN32) || defined(_WIN64)
-internal char path_sep = '\\';
-#endif
-
-void join_root_and_leaf(const char *root, const char *leaf, char *dst);
-
-void join_path(char *dst, u64 count, ...) {
-  va_list args;
-
-  va_start(args, count);
-
-  for (u64 i = 0; i < count; ++i) {
-    join_root_and_leaf(dst, va_arg(args, const char *), dst);
-  }
-
-  va_end(args);
-}
-
-void dirup(char *dst, u64 levels, const char *path) {
-  if (levels < 1) {
-    return;
-  }
-
-  u64 end_index = 0;
-  u64 sep_count = 0;
-
-  u64 full_length;
-  u64 length;
-  length = full_length = strlen(path);
-
-  if (path[length - 1] == path_sep) {
-    --length;
-  }
-
-  for (i64 i = length - 1; i >= 0; --i) {
-    if (path[i] == path_sep) {
-      ++sep_count;
-      end_index = i;
-
-      if (sep_count == levels) {
-        break;
-      }
-    }
-  }
-
-  if (sep_count < levels) {
-    end_index = 0;
-  }
-
-  if (dst == path) {
-    memset(&dst[end_index], 0, full_length - end_index);
-  } else {
-    u64 dst_length = strlen(dst);
-    memset(dst, 0, dst_length);
-    strncpy(dst, path, end_index);
-  }
-}
-
-void join_root_and_leaf(const char *root, const char *leaf, char *dst) {
-  u64 root_length = strlen(root);
-  u64 root_end = root_length - 1;
-
-  u64 leaf_length = strlen(leaf);
-  u64 leaf_start = 0;
-
-  if (root[root_end] == path_sep) {
-    --root_end;
-  }
-
-  if (leaf[leaf_start] == path_sep) {
-    ++leaf_start;
-  }
-
-  memcpy(dst, root, ++root_end);
-
-  dst[root_end] = path_sep;
-
-  memcpy(&(dst[++root_end]), &(leaf[leaf_start]), leaf_length - leaf_start);
-}

src/core/cpath/cpath.h

@@ -1,25 +0,0 @@
-#ifndef PATH_UTILS_H
-#define PATH_UTILS_H
-
-#include "aliases.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
-
-#define NUMPARTS(...)                                                          \
-  (sizeof((const char *[]){"", __VA_ARGS__}) / sizeof(const char *) - 1)
-
-#define wapp_cpath_join_path(DST, ...)                                         \
-  join_path(DST, NUMPARTS(__VA_ARGS__), __VA_ARGS__)
-#define wapp_cpath_dirname(DST, PATH) dirup(DST, 1, PATH)
-#define wapp_cpath_dirup(DST, COUNT, PATH) dirup(DST, COUNT, PATH)
-
-void join_path(char *dst, u64 count, ...);
-void dirup(char *dst, u64 levels, const char *path);
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-
-#endif // !PATH_UTILS_H

src/core/mem/allocator/mem_allocator.c

@@ -0,0 +1,44 @@
+#include "mem_allocator.h"
+#include "../../../common/aliases/aliases.h"
+#include <stdlib.h>
+
+void *wapp_mem_allocator_alloc(const Allocator *allocator, u64 size) {
+  if (!allocator || !(allocator->alloc)) {
+    return NULL;
+  }
+
+  return allocator->alloc(size, allocator->obj);
+}
+
+void *wapp_mem_allocator_alloc_aligned(const Allocator *allocator, u64 size, u64 alignment) {
+  if (!allocator || !(allocator->alloc_aligned)) {
+    return NULL;
+  }
+
+  return allocator->alloc_aligned(size, alignment, allocator->obj);
+}
+
+void *wapp_mem_allocator_realloc(const Allocator *allocator, void *ptr, u64 old_size, u64 new_size) {
+  if (!allocator || !(allocator->realloc)) {
+    return NULL;
+  }
+
+  return allocator->realloc(ptr, old_size, new_size, allocator->obj);
+}
+
+void *wapp_mem_allocator_realloc_aligned(const Allocator *allocator, void *ptr, u64 old_size,
+                                         u64 new_size, u64 alignment) {
+  if (!allocator || !(allocator->realloc_aligned)) {
+    return NULL;
+  }
+
+  return allocator->realloc_aligned(ptr, old_size, new_size, alignment, allocator->obj);
+}
+
+void wapp_mem_allocator_free(const Allocator *allocator, void **ptr, u64 size) {
+  if (!allocator || !(allocator->free)) {
+    return;
+  }
+
+  allocator->free(ptr, size, allocator->obj);
+}

src/core/mem/allocator/mem_allocator.h

@@ -0,0 +1,42 @@
+#ifndef MEM_ALLOCATOR_H
+#define MEM_ALLOCATOR_H
+
+#include "../../../common/aliases/aliases.h"
+#include <string.h>
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+typedef void *(MemAllocFunc)(u64 size, void *alloc_obj);
+typedef void *(MemAllocAlignedFunc)(u64 size, u64 alignment, void *alloc_obj);
+typedef void *(MemReallocFunc)(void *ptr, u64 old_size, u64 new_size, void *alloc_obj);
+typedef void *(MemReallocAlignedFunc)(void *ptr, u64 old_size, u64 new_size, u64 alignment, void *alloc_obj);
+typedef void  (MemFreeFunc)(void **ptr, u64 size, void *alloc_obj);
+
+
+typedef struct allocator Allocator;
+struct allocator {
+  void *obj;
+  MemAllocFunc *alloc;
+  MemAllocAlignedFunc *alloc_aligned;
+  MemReallocFunc *realloc;
+  MemReallocAlignedFunc *realloc_aligned;
+  MemFreeFunc *free;
+};
+
+#define wapp_mem_allocator_invalid(ALLOCATOR) (memcmp(ALLOCATOR, &((Allocator){0}), sizeof(Allocator)) == 0)
+
+
+void *wapp_mem_allocator_alloc(const Allocator *allocator, u64 size);
+void *wapp_mem_allocator_alloc_aligned(const Allocator *allocator, u64 size, u64 alignment);
+void *wapp_mem_allocator_realloc(const Allocator *allocator, void *ptr, u64 old_size, u64 new_size);
+void *wapp_mem_allocator_realloc_aligned(const Allocator *allocator, void *ptr, u64 old_size,
+                                         u64 new_size, u64 alignment);
+void wapp_mem_allocator_free(const Allocator *allocator, void **ptr, u64 size);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !MEM_ALLOCATOR_H

src/core/mem/arena/mem_arena.c

@@ -1,7 +1,7 @@
 #include "mem_arena.h"
-#include "aliases.h"
-#include "mem_utils.h"
-#include "misc_utils.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../common/misc/misc_utils.h"
+#include "../../os/mem/mem_os.h"
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
@@ -12,7 +12,7 @@
 #define DEFAULT_ALIGNMENT (2 * sizeof(void *))
 #endif /* ifndef DEFAULT_ALIGNMENT */
 
-#define ARENA_MINIMUM_CAPACITY 1024
+#define ARENA_MINIMUM_CAPACITY KB(16) // Allocate minimum of 4 pages
 
 struct arena {
   u8 *buf;
@@ -25,10 +25,7 @@ struct arena {
 #endif // ifdef WAPP_PLATFORM_WINDOWS
 };
 
-// PUBLIC API
-
-bool wapp_mem_arena_init(Arena **arena, u64 base_capacity, MemAllocFlags flags,
-                         bool zero_buffer) {
+bool wapp_mem_arena_init_custom(Arena **arena, u64 base_capacity, MemAllocFlags flags, bool zero_buffer) {
   if (!arena || *arena || base_capacity == 0) {
     return false;
   }
@@ -39,23 +36,19 @@ bool wapp_mem_arena_init(Arena **arena, u64 base_capacity, MemAllocFlags flags,
     return false;
   }
 
-  u64 arena_capacity = base_capacity >= ARENA_MINIMUM_CAPACITY
-                           ? base_capacity
-                           : ARENA_MINIMUM_CAPACITY;
+  u64 arena_capacity = base_capacity >= ARENA_MINIMUM_CAPACITY ? base_capacity : ARENA_MINIMUM_CAPACITY;
 
-  arena_ptr->buf = (u8 *)wapp_mem_util_alloc(
-      NULL, arena_capacity, WAPP_MEM_ACCESS_READ_WRITE, flags,
-      zero_buffer ? WAPP_MEM_INIT_INITIALISED : WAPP_MEM_INIT_UNINITIALISED);
+  arena_ptr->buf = (u8 *)wapp_mem_util_alloc(NULL, arena_capacity, WAPP_MEM_ACCESS_READ_WRITE, flags,
+                                             zero_buffer ? WAPP_MEM_INIT_INITIALISED : WAPP_MEM_INIT_UNINITIALISED);
 
   if (!(arena_ptr->buf)) {
     wapp_mem_arena_destroy(arena);
     return false;
   }
 
-  arena_ptr->capacity = arena_capacity;
-  arena_ptr->offset = arena_ptr->buf;
-  arena_ptr->committed =
-      (flags & WAPP_MEM_ALLOC_COMMIT) == WAPP_MEM_ALLOC_COMMIT;
+  arena_ptr->capacity  = arena_capacity;
+  arena_ptr->offset    = arena_ptr->buf;
+  arena_ptr->committed = (flags & WAPP_MEM_ALLOC_COMMIT) == WAPP_MEM_ALLOC_COMMIT;
 
   return true;
 }
@@ -80,18 +73,51 @@ void *wapp_mem_arena_alloc_aligned(Arena *arena, u64 size, u64 alignment) {
 
 #ifdef WAPP_PLATFORM_WINDOWS
   if (!(arena->committed)) {
-    output = (u8 *)wapp_mem_util_alloc(
-        alloc_start, (uptr)(arena->offset) - (uptr)(alloc_start),
-        WAPP_MEM_ACCESS_READ_WRITE, WAPP_MEM_ALLOC_COMMIT,
-        WAPP_MEM_INIT_INITIALISED);
+    wapp_mem_util_alloc(alloc_start, (uptr)(arena->offset) - (uptr)(alloc_start),
+                        WAPP_MEM_ACCESS_READ_WRITE, WAPP_MEM_ALLOC_COMMIT,
+                        WAPP_MEM_INIT_UNINITIALISED);
   }
-#else
-  memset(output, 0, size);
 #endif // ifdef WAPP_PLATFORM_WINDOWS
 
+  memset(output, 0, size);
+
   return (void *)output;
 }
 
+void *wapp_mem_arena_realloc(Arena *arena, void *ptr, u64 old_size, u64 new_size) {
+  if ((u8*)ptr < arena->buf || (u8*)ptr > arena->offset ||
+      arena->offset + new_size >= arena->buf + arena->capacity) {
+    return NULL;
+  }
+
+  void *new_ptr = wapp_mem_arena_alloc(arena, new_size);
+  if (!new_ptr) {
+    return NULL;
+  }
+
+  u64 copy_size = new_size <= old_size ? new_size : old_size;
+  memcpy(new_ptr, ptr, copy_size);
+
+  return new_ptr;
+}
+
+void *wapp_mem_arena_realloc_aligned(Arena *arena, void *ptr, u64 old_size, u64 new_size, u64 alignment) {
+  if ((u8*)ptr < arena->buf || (u8*)ptr > arena->offset ||
+      arena->offset + new_size >= arena->buf + arena->capacity) {
+    return NULL;
+  }
+
+  void *new_ptr = wapp_mem_arena_alloc_aligned(arena, new_size, alignment);
+  if (!new_ptr) {
+    return NULL;
+  }
+
+  u64 copy_size = new_size <= old_size ? new_size : old_size;
+  memcpy(new_ptr, ptr, copy_size);
+
+  return new_ptr;
+}
+
 void wapp_mem_arena_clear(Arena *arena) {
   if (!arena) {
     return;

src/core/mem/arena/mem_arena.h

@@ -1,37 +1,40 @@
 #ifndef MEM_ARENA_H
 #define MEM_ARENA_H
 
-#include "aliases.h"
-#include "mem_utils.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../os/mem/mem_os.h"
 #include <stdbool.h>
 
 #ifdef __cplusplus
-extern "C" {
+BEGIN_C_LINKAGE
 #endif // __cplusplus
 
 typedef struct arena Arena;
 
-#define wapp_mem_arena_init_default(arena_dptr, base_capacity)                 \
-  (wapp_mem_arena_init(arena_dptr, base_capacity, WAPP_MEM_ALLOC_RESERVE,      \
-                       false))
+#define wapp_mem_arena_init(arena_dptr, base_capacity)                         \
+  (wapp_mem_arena_init_custom(arena_dptr, base_capacity, WAPP_MEM_ALLOC_RESERVE, false))
 #define wapp_mem_arena_init_commit(arena_dptr, base_capacity)                  \
-  (wapp_mem_arena_init(arena_dptr, base_capacity,                              \
-                       WAPP_MEM_ALLOC_RESERVE | WAPP_MEM_ALLOC_COMMIT, false))
+  (wapp_mem_arena_init_custom(arena_dptr, base_capacity, WAPP_MEM_ALLOC_RESERVE | WAPP_MEM_ALLOC_COMMIT, false))
 #define wapp_mem_arena_init_zero(arena_dptr, base_capacity)                    \
-  (wapp_mem_arena_init(arena_dptr, base_capacity, WAPP_MEM_ALLOC_RESERVE, true))
+  (wapp_mem_arena_init_custom(arena_dptr, base_capacity, WAPP_MEM_ALLOC_RESERVE, true))
 #define wapp_mem_arena_init_commit_and_zero(arena_dptr, base_capacity)         \
-  (wapp_mem_arena_init(arena_dptr, base_capacity,                              \
-                       WAPP_MEM_ALLOC_RESERVE | WAPP_MEM_ALLOC_COMMIT, true))
+  (wapp_mem_arena_init_custom(arena_dptr, base_capacity, WAPP_MEM_ALLOC_RESERVE | WAPP_MEM_ALLOC_COMMIT, true))
 
-bool wapp_mem_arena_init(Arena **arena, u64 base_capacity, MemAllocFlags flags,
-                         bool zero_buffer);
+/**
+ * Arena initialisation function. `wapp_mem_arena_init_custom` provides the most
+ * control over how the Arena is initialised. Wrapper macros are provided for
+ * easier use.
+ */
+bool wapp_mem_arena_init_custom(Arena **arena, u64 base_capacity, MemAllocFlags flags, bool zero_buffer);
 void *wapp_mem_arena_alloc(Arena *arena, u64 size);
 void *wapp_mem_arena_alloc_aligned(Arena *arena, u64 size, u64 alignment);
+void *wapp_mem_arena_realloc(Arena *arena, void *ptr, u64 old_size, u64 new_size);
+void *wapp_mem_arena_realloc_aligned(Arena *arena, void *ptr, u64 old_size, u64 new_size, u64 alignment);
 void wapp_mem_arena_clear(Arena *arena);
 void wapp_mem_arena_destroy(Arena **arena);
 
 #ifdef __cplusplus
-}
+END_C_LINKAGE
 #endif // __cplusplus
 
 #endif // !MEM_ARENA_H

src/core/mem/arena/mem_arena_allocator.c

@@ -0,0 +1,57 @@
+#include "mem_arena_allocator.h"
+#include "mem_arena.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../os/mem/mem_os.h"
+
+internal inline void *mem_arena_alloc(u64 size, void *alloc_obj);
+internal inline void *mem_arena_alloc_aligned(u64 size, u64 alignment, void *alloc_obj);
+internal inline void *mem_arena_realloc(void *ptr, u64 old_size, u64 new_size, void *alloc_obj);
+internal inline void *mem_arena_realloc_aligned(void *ptr, u64 old_size, u64 new_size, u64 alignment,
+                                                void *alloc_obj);
+
+
+Allocator wapp_mem_arena_allocator_init_custom(u64 base_capacity, MemAllocFlags flags, bool zero_buffer) {
+  Allocator allocator = {0};
+  bool initialised = wapp_mem_arena_init_custom((Arena **)(&allocator.obj), base_capacity, flags, zero_buffer);
+  if (!initialised) {
+    return allocator;
+  }
+
+  allocator.alloc           = mem_arena_alloc;
+  allocator.alloc_aligned   = mem_arena_alloc_aligned;
+  allocator.realloc         = mem_arena_realloc;
+  allocator.realloc_aligned = mem_arena_realloc_aligned;
+
+  return allocator;
+}
+
+void wapp_mem_arena_allocator_clear(Allocator *allocator) {
+  wapp_mem_arena_clear((Arena *)(allocator->obj));
+}
+
+void wapp_mem_arena_allocator_destroy(Allocator *allocator) {
+  wapp_mem_arena_destroy((Arena **)(&(allocator->obj)));
+  *allocator = (Allocator){0};
+}
+
+
+internal inline void *mem_arena_alloc(u64 size, void *alloc_obj) {
+  Arena *arena = (Arena *)alloc_obj;
+  return wapp_mem_arena_alloc(arena, size);
+}
+
+internal inline void *mem_arena_alloc_aligned(u64 size, u64 alignment, void *alloc_obj) {
+  Arena *arena = (Arena *)alloc_obj;
+  return wapp_mem_arena_alloc_aligned(arena, size, alignment);
+}
+
+internal inline void *mem_arena_realloc(void *ptr, u64 old_size, u64 new_size, void *alloc_obj) {
+  Arena *arena = (Arena *)alloc_obj;
+  return wapp_mem_arena_realloc(arena, ptr, old_size, new_size);
+}
+
+internal inline void *mem_arena_realloc_aligned(void *ptr, u64 old_size, u64 new_size, u64 alignment,
+                                                void *alloc_obj) {
+  Arena *arena = (Arena *)alloc_obj;
+  return wapp_mem_arena_realloc_aligned(arena, ptr, old_size, new_size, alignment);
+}

src/core/mem/arena/mem_arena_allocator.h

@@ -0,0 +1,41 @@
+#ifndef MEM_ARENA_ALLOCATOR_H
+#define MEM_ARENA_ALLOCATOR_H
+
+#include "../../../common/aliases/aliases.h"
+#include "../allocator/mem_allocator.h"
+#include "../../os/mem/mem_os.h"
+#include <stdbool.h>
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+#define wapp_mem_arena_allocator_init(base_capacity)                           \
+  (wapp_mem_arena_allocator_init_custom(base_capacity, WAPP_MEM_ALLOC_RESERVE, false))
+#define wapp_mem_arena_allocator_init_commit(base_capacity)                    \
+  (wapp_mem_arena_allocator_init_custom(base_capacity, WAPP_MEM_ALLOC_RESERVE | WAPP_MEM_ALLOC_COMMIT, false))
+#define wapp_mem_arena_allocator_init_zero(base_capacity)                      \
+  (wapp_mem_arena_allocator_init_custom(base_capacity, WAPP_MEM_ALLOC_RESERVE, true))
+#define wapp_mem_arena_allocator_init_commit_and_zero(base_capacity)           \
+  (wapp_mem_arena_allocator_init_custom(base_capacity, WAPP_MEM_ALLOC_RESERVE | WAPP_MEM_ALLOC_COMMIT, true))
+
+/**
+ * Wraps an Arena in an Allocator object. It attempts to initialise the Arena
+ * and, if successful, defines the operations supported by it to be used by the
+ * Allocator.
+ *
+ * An Arena allocator only supports normal allocation and aligned allocation.
+ * Reallocation, aligned reallocation and freeing aren't implemented.
+ *
+ * The `wapp_mem_arena_allocator_init_custom` provides the most control over how
+ * the Arena is initialised. Wrapper macros are provided for easier use.
+ */
+Allocator wapp_mem_arena_allocator_init_custom(u64 base_capacity, MemAllocFlags flags, bool zero_buffer);
+void wapp_mem_arena_allocator_clear(Allocator *allocator);
+void wapp_mem_arena_allocator_destroy(Allocator *allocator);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !MEM_ARENA_ALLOCATOR_H

src/core/mem/utils/mem_utils.c

@@ -0,0 +1,28 @@
+#include "mem_utils.h"
+#include "../../../common/aliases/aliases.h"
+#include <stdbool.h>
+#include <stddef.h>
+#include <assert.h>
+
+internal bool is_power_of_two(u64 num) { return (num & (num - 1)) == 0; }
+
+void *wapp_mem_util_align_forward(void *ptr, u64 alignment) {
+  if (!ptr) {
+    return NULL;
+  }
+
+  assert(is_power_of_two(alignment));
+
+  uptr p = (uptr)ptr;
+  uptr align = (uptr)alignment;
+
+  // Similar to p % align, but it's a faster implementation that works fine
+  // because align is guaranteed to be a power of 2
+  uptr modulo = p & (align - 1);
+
+  if (modulo != 0) {
+    p += align - modulo;
+  }
+
+  return (void *)p;
+}

src/core/mem/utils/mem_utils.h

@@ -0,0 +1,16 @@
+#ifndef MEM_UTILS_H
+#define MEM_UTILS_H
+
+#include "../../../common/aliases/aliases.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+void *wapp_mem_util_align_forward(void *ptr, u64 alignment);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !MEM_UTILS_H

src/core/os/cpath/cpath.c

@@ -0,0 +1,134 @@
+#include "cpath.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../common/misc/misc_utils.h"
+#include "../../mem/allocator/mem_allocator.h"
+#include "../../mem/arena/mem_arena_allocator.h"
+#include "../../strings/str8/str8.h"
+#include "../../strings/str8/str8_list.h"
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+u32 wapp_cpath_join_path(Str8 *dst, const DBL_LIST(Str8) *parts) {
+  if (!dst || !parts) {
+    return CPATH_JOIN_INVALID_ARGS;
+  }
+
+  if (parts->node_count == 0) {
+    return CPATH_JOIN_EMPTY_PARTS;
+  }
+
+  Str8 separator = wapp_str8_buf(4);
+  wapp_str8_push_back(&separator, PATH_SEP);
+
+  u64 required_capacity = parts->node_count * separator.size + wapp_str8_list_total_size(parts);
+  if (dst->capacity < required_capacity) {
+    return CPATH_JOIN_INSUFFICIENT_DST_CAPACITY;
+  }
+
+  // Handle first node
+  const DBL_NODE(Str8) *first_node = wapp_dbl_list_get(Str8, parts, 0);
+  wapp_str8_copy_str8_capped(dst, first_node->item);
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  const DBL_NODE(Str8) *node = first_node;
+  u64 node_index       = 1;
+  bool running         = true;
+  while (running && node->next) {
+    node = node->next;
+    if (node->item->size == 0) {
+      continue;
+    }
+
+    if (dst->size > 0) {
+      char dst_last = wapp_str8_get(dst, dst->size - 1);
+      char node_start = wapp_str8_get(node->item, 0);
+      bool add_path_sep = dst_last != PATH_SEP && node_start != PATH_SEP;
+
+      if (add_path_sep) {
+        wapp_str8_concat_capped(dst, &separator);
+      }
+    }
+
+    wapp_str8_concat_capped(dst, node->item);
+
+    ++node_index;
+    running = node_index < parts->node_count;
+  }
+
+  return CPATH_JOIN_SUCCESS;
+}
+
+Str8 *dirup(const Allocator *allocator, Str8RO *path, u64 levels) {
+  Str8 *output = NULL;
+  if (!allocator || !path) {
+    goto RETURN_DIRUP;
+  }
+
+  bool absolute  = wapp_str8_get(path, 0) == PATH_SEP;
+  Str8 separator = wapp_str8_buf(4);
+  wapp_str8_push_back(&separator, PATH_SEP);
+
+  if (path->size == 0) {
+    output = wapp_str8_alloc_buf(allocator, 16);
+    if (!output) {
+      goto RETURN_DIRUP;
+    }
+
+    wapp_str8_push_back(output, absolute ? PATH_SEP : '.');
+    goto RETURN_DIRUP;
+  }
+
+  if (levels < 1) {
+    output = wapp_str8_alloc_str8(allocator, path);
+    goto RETURN_DIRUP;
+  }
+
+  Allocator tmp_arena = wapp_mem_arena_allocator_init(MB(8));
+  if (wapp_mem_allocator_invalid(&tmp_arena)) {
+    goto RETURN_DIRUP;
+  }
+
+  DBL_LIST(Str8) *parts = wapp_str8_split(&tmp_arena, path, &separator);
+  if (!parts) {
+    goto RETURN_DIRUP;
+  }
+
+  if (levels >= parts->node_count) {
+    output = wapp_str8_alloc_buf(allocator, 16);
+    if (!output) {
+      goto LIST_CLEANUP_DIRUP;
+    }
+
+    wapp_str8_push_back(output, absolute ? PATH_SEP : '.');
+  } else {
+    for (u64 i = 0; i < levels; ++i) {
+      wapp_dbl_list_pop_back(Str8, parts);
+    }
+    
+    u64 alignment  = sizeof(void *) * 2;
+    u64 alloc_size = wapp_str8_list_total_size(parts) + parts->node_count * separator.size;
+    u64 modulo     = alloc_size & (alignment - 1);
+    alloc_size    += alignment - modulo;
+
+    output = wapp_str8_alloc_buf(allocator, alloc_size);
+    if (output) {
+      if (absolute) {
+        wapp_str8_push_back(output, PATH_SEP);
+      }
+
+      Str8 *joined = wapp_str8_join(&tmp_arena, parts, &separator);
+      if (joined) {
+        wapp_str8_concat_capped(output, joined);
+      }
+    }
+  }
+
+LIST_CLEANUP_DIRUP:
+  wapp_mem_arena_allocator_destroy(&tmp_arena);
+
+RETURN_DIRUP:
+  return output;
+}

src/core/os/cpath/cpath.h

@@ -0,0 +1,38 @@
+#ifndef CPATH_H
+#define CPATH_H
+
+#include "../../../common/aliases/aliases.h"
+#include "../../../common/platform/platform.h"
+#include "../../mem/allocator/mem_allocator.h"
+#include "../../strings/str8/str8.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+#ifdef WAPP_PLATFORM_POSIX
+#define PATH_SEP '/'
+#elif defined(WAPP_PLATFORM_WINDOWS)
+#define PATH_SEP '\\'
+#else
+#error "Unrecognised platform"
+#endif
+
+#define wapp_cpath_dirname(ALLOCATOR, PATH) dirup(ALLOCATOR, PATH, 1)
+#define wapp_cpath_dirup(ALLOCATOR, PATH, COUNT) dirup(ALLOCATOR, PATH, COUNT)
+
+enum {
+  CPATH_JOIN_SUCCESS = 0,
+  CPATH_JOIN_INVALID_ARGS,
+  CPATH_JOIN_EMPTY_PARTS,
+  CPATH_JOIN_INSUFFICIENT_DST_CAPACITY,
+};
+
+u32  wapp_cpath_join_path(Str8 *dst, const DBL_LIST(Str8) *parts);
+Str8 *dirup(const Allocator *allocator, Str8RO *path, u64 levels);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !CPATH_H

src/core/os/mem/mem_os.c

@@ -0,0 +1,29 @@
+#include "mem_os.h"
+#include "mem_os_ops.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../common/platform/platform.h"
+#include <assert.h>
+#include <stdbool.h>
+#include <string.h>
+
+#if defined(WAPP_PLATFORM_WINDOWS)
+#include "win/mem_os_win.h"
+#elif defined(WAPP_PLATFORM_POSIX)
+#include "posix/mem_os_posix.h"
+#else
+#error "Unrecognised platform"
+#endif
+
+void *wapp_mem_util_alloc(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type) {
+  void *output = mem_util_allocate(addr, size, access, flags, type);
+
+  if (type == WAPP_MEM_INIT_INITIALISED) {
+    memset(output, 0, size);
+  }
+
+  return output;
+}
+
+void wapp_mem_util_free(void *ptr, u64 size) {
+  mem_util_free(ptr, size);
+}

src/core/os/mem/mem_os.h

@@ -0,0 +1,32 @@
+#ifndef MEM_OS_H
+#define MEM_OS_H
+
+#include "../../../common/aliases/aliases.h"
+#include "../../../common/platform/platform.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+#include "mem_os_ops.h"
+
+#if defined(WAPP_PLATFORM_WINDOWS)
+#include "win/mem_os_win.h"
+#elif defined(WAPP_PLATFORM_POSIX)
+#include "posix/mem_os_posix.h"
+#else
+#error "Unrecognised platform"
+#endif
+
+void *wapp_mem_util_align_forward(void *ptr, u64 alignment);
+void *wapp_mem_util_alloc(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type);
+void wapp_mem_util_free(void *ptr, u64 size);
+
+external void *mem_util_allocate(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type);
+external void mem_util_free(void *ptr, u64 size);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !MEM_OS_H

src/core/os/mem/mem_os_ops.h

@@ -0,0 +1,26 @@
+#ifndef MEM_OS_OPS_H
+#define MEM_OS_OPS_H
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+typedef enum mem_access {
+  WAPP_MEM_ACCESS_NONE,
+  WAPP_MEM_ACCESS_READ_ONLY,
+  WAPP_MEM_ACCESS_EXEC_ONLY,
+  WAPP_MEM_ACCESS_READ_WRITE,
+  WAPP_MEM_ACCESS_READ_EXEC,
+  WAPP_MEM_ACCESS_READ_WRITE_EXEC,
+} MemAccess;
+
+typedef enum mem_init_type {
+  WAPP_MEM_INIT_UNINITIALISED,
+  WAPP_MEM_INIT_INITIALISED,
+} MemInitType;
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !MEM_OS_OPS_H

src/core/os/mem/posix/mem_os_posix.c

@@ -0,0 +1,34 @@
+#include "../../../../common/aliases/aliases.h"
+#include "../../../../common/platform/platform.h"
+
+#ifdef WAPP_PLATFORM_POSIX
+
+#include "mem_os_posix.h"
+#include "../mem_os_ops.h"
+#include <sys/mman.h>
+
+internal const i32 access_types[] = {
+    [WAPP_MEM_ACCESS_NONE]            = PROT_NONE,
+    [WAPP_MEM_ACCESS_READ_ONLY]       = PROT_READ,
+    [WAPP_MEM_ACCESS_EXEC_ONLY]       = PROT_EXEC,
+    [WAPP_MEM_ACCESS_READ_WRITE]      = PROT_READ | PROT_WRITE,
+    [WAPP_MEM_ACCESS_READ_EXEC]       = PROT_READ | PROT_EXEC,
+    [WAPP_MEM_ACCESS_READ_WRITE_EXEC] = PROT_READ | PROT_WRITE | PROT_EXEC,
+};
+
+void *mem_util_allocate(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type) {
+  (void)type;
+  i32 alloc_flags = flags | MAP_ANON | MAP_PRIVATE;
+
+#if defined(WAPP_PLATFORM_LINUX) || defined(WAPP_PLATFORM_GNU) || defined(WAPP_PLATFORM_NET_BSD)
+  alloc_flags |= MAP_NORESERVE;
+#endif
+
+  return mmap(addr, size, access_types[access], alloc_flags, -1, 0);
+}
+
+void mem_util_free(void *ptr, u64 size) {
+  munmap(ptr, size);
+}
+
+#endif // !WAPP_PLATFORM_POSIX

src/core/os/mem/posix/mem_os_posix.h

@@ -0,0 +1,33 @@
+#ifndef MEM_OS_POSIX_H
+#define MEM_OS_POSIX_H
+
+#include "../../../../common/platform/platform.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // !__cplusplus
+
+#ifdef WAPP_PLATFORM_POSIX
+
+#include <sys/mman.h>
+
+typedef enum mem_alloc_flags {
+#if defined(WAPP_PLATFORM_LINUX) || defined(WAPP_PLATFORM_GNU)
+  WAPP_MEM_ALLOC_RESERVE = 0,
+  WAPP_MEM_ALLOC_COMMIT  = MAP_POPULATE,
+#elif defined(WAPP_PLATFORM_FREE_BSD)
+  WAPP_MEM_ALLOC_RESERVE = 0,
+  WAPP_MEM_ALLOC_COMMIT  = MAP_PREFAULT_READ,
+#elif defined(WAPP_PLATFORM_BSD) || defined(WAPP_PLATFORM_UNIX) || defined(WAPP_PLATFORM_APPLE)
+  WAPP_MEM_ALLOC_RESERVE = 0,
+  WAPP_MEM_ALLOC_COMMIT  = 0,
+#endif
+} MemAllocFlags;
+
+#endif // !WAPP_PLATFORM_POSIX
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // !__cplusplus
+
+#endif // !MEM_OS_POSIX_H

src/core/os/mem/win/mem_os_win.c

@@ -0,0 +1,35 @@
+#include "../../../../common/aliases/aliases.h"
+#include "../../../../common/platform/platform.h"
+
+#ifdef WAPP_PLATFORM_WINDOWS
+
+#include "mem_os_win.h"
+#include "../mem_os_ops.h"
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#include <memoryapi.h>
+
+internal const i32 access_types[] = {
+    [WAPP_MEM_ACCESS_NONE]            = PAGE_NOACCESS,
+    [WAPP_MEM_ACCESS_READ_ONLY]       = PAGE_READONLY,
+    [WAPP_MEM_ACCESS_EXEC_ONLY]       = PAGE_EXECUTE,
+    [WAPP_MEM_ACCESS_READ_WRITE]      = PAGE_READWRITE,
+    [WAPP_MEM_ACCESS_READ_EXEC]       = PAGE_EXECUTE_READ,
+    [WAPP_MEM_ACCESS_READ_WRITE_EXEC] = PAGE_EXECUTE_READWRITE,
+};
+
+void *mem_util_allocate(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type) {
+  // Ensure memory is committed if it's meant to be initialised
+  if (type == WAPP_MEM_INIT_INITIALISED) {
+    flags |= WAPP_MEM_ALLOC_COMMIT;
+  }
+
+  return VirtualAlloc(addr, (SIZE_T)size, flags, access_types[access]);
+}
+
+void mem_util_free(void *ptr, u64 size) {
+  VirtualFree(ptr, size, MEM_RELEASE);
+}
+
+#endif // !WAPP_PLATFORM_WINDOWS

src/core/os/mem/win/mem_os_win.h

@@ -0,0 +1,27 @@
+#ifndef MEM_OS_WIN_H
+#define MEM_OS_WIN_H
+
+#include "../../../../common/platform/platform.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // !__cplusplus
+
+#ifdef WAPP_PLATFORM_WINDOWS
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#include <memoryapi.h>
+
+typedef enum mem_alloc_flags {
+  WAPP_MEM_ALLOC_RESERVE = MEM_RESERVE,
+  WAPP_MEM_ALLOC_COMMIT  = MEM_COMMIT,
+} MemAllocFlags;
+
+#endif // !WAPP_PLATFORM_WINDOWS
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // !__cplusplus
+
+#endif // !MEM_OS_WIN_H

src/core/os/shell/commander/commander.c

@@ -0,0 +1,99 @@
+#include "commander.h"
+#include "commander_output.h"
+#include "../utils/shell_utils.h"
+#include "../../../mem/allocator/mem_allocator.h"
+#include "../../../mem/arena/mem_arena_allocator.h"
+#include "../../../strings/str8/str8.h"
+#include "../../../../common/aliases/aliases.h"
+#include "../../../../common/misc/misc_utils.h"
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define CMD_BUF_LEN 8192
+#define OUT_BUF_LEN 4096
+
+internal inline CMDResult execute_command(Str8RO *cmd, CMDOutHandling out_handling, Str8 *out_buf);
+internal inline CMDError get_command_output(FILE *fp, CMDOutHandling out_handling, Str8 *out_buf);
+
+CMDResult wapp_shell_commander_execute(CMDOutHandling out_handling, Str8 *out_buf, const DBL_LIST(Str8) *cmd) {
+  if (!cmd) {
+    return CMD_NO_EXIT(SHELL_ERR_INVALID_ARGS);
+  }
+
+  Allocator arena = wapp_mem_arena_allocator_init(KB(500));
+
+  Str8 *cmd_str = wapp_str8_join(&arena, cmd, &wapp_str8_lit_ro(" "));
+  if (!cmd_str) {
+    wapp_mem_arena_allocator_destroy(&arena);
+    return CMD_NO_EXIT(SHELL_ERR_ALLOCATION_FAIL);
+  }
+
+  // Redirect output
+  cmd_str = wapp_str8_alloc_concat(&arena, cmd_str, &wapp_str8_lit_ro(" 2>&1"));
+
+  CMDResult output = execute_command(cmd_str, out_handling, out_buf);
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return output;
+}
+
+internal inline CMDResult execute_command(Str8RO *cmd, CMDOutHandling out_handling, Str8 *out_buf) {
+  char cmd_buf[CMD_BUF_LEN] = {0};
+  wapp_str8_copy_to_cstr(cmd_buf, cmd, CMD_BUF_LEN);
+
+  FILE *fp = wapp_shell_utils_popen(cmd_buf, "r");
+  if (!fp) {
+    return CMD_NO_EXIT(SHELL_ERR_PROC_START_FAIL);
+  }
+
+  CMDResult output;
+
+  CMDError err = get_command_output(fp, out_handling, out_buf);
+  if (err > SHELL_ERR_NO_ERROR) {
+    output = CMD_NO_EXIT(err);
+    goto EXECUTE_COMMAND_CLOSE;
+  }
+
+  i32 st = EXIT_SUCCESS;
+  err = get_output_status(fp, &st);
+  if (err > SHELL_ERR_NO_ERROR) {
+    output = CMD_NO_EXIT(err);
+    goto EXECUTE_COMMAND_CLOSE;
+  }
+
+  // Process is already closed in get_output_status
+  fp = NULL;
+
+  output = (CMDResult){
+      .exited = true,
+      .exit_code = st,
+      .error = SHELL_ERR_NO_ERROR,
+  };
+
+EXECUTE_COMMAND_CLOSE:
+  if (fp) {
+    wapp_shell_utils_pclose(fp);
+  }
+  return output;
+}
+
+internal inline CMDError get_command_output(FILE *fp, CMDOutHandling out_handling, Str8 *out_buf) {
+  Str8 out = wapp_str8_buf(OUT_BUF_LEN);
+
+  out.size = fread((void *)out.buf, sizeof(u8), out.capacity, fp);
+  if (out_handling == SHELL_OUTPUT_CAPTURE && out_buf != NULL) {
+    if (out.size >= out_buf->capacity) {
+      return SHELL_ERR_OUT_BUF_FULL;
+    }
+
+    wapp_str8_concat_capped(out_buf, &out);
+  } else if (out_handling == SHELL_OUTPUT_PRINT) {
+    printf(WAPP_STR8_SPEC, wapp_str8_varg(out));
+  }
+
+  return SHELL_ERR_NO_ERROR;
+}

src/core/os/shell/commander/commander.h

@@ -0,0 +1,25 @@
+#ifndef COMMANDER_H
+#define COMMANDER_H
+
+#include "commander_output.h"
+#include "../../../../common/aliases/aliases.h"
+#include "../../../strings/str8/str8.h"
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+#define CMD_NO_EXIT(ERR) ((CMDResult){.exited = false, .exit_code = EXIT_FAILURE, .error = ERR})
+
+CMDResult wapp_shell_commander_execute(CMDOutHandling out_handling, Str8 *out_buf, const DBL_LIST(Str8) *cmd);
+
+external CMDError get_output_status(FILE *fp, i32 *status_out);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !COMMANDER_H

src/core/os/shell/commander/commander_output.h

@@ -0,0 +1,43 @@
+#ifndef COMMANDER_OUTPUT_H
+#define COMMANDER_OUTPUT_H
+
+#include "../../../../common/aliases/aliases.h"
+#include "../../../../common/platform/platform.h"
+#include <stdbool.h>
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+typedef enum {
+  SHELL_OUTPUT_DISCARD,
+  SHELL_OUTPUT_PRINT,
+  SHELL_OUTPUT_CAPTURE,
+} CMDOutHandling;
+
+typedef enum {
+  SHELL_ERR_NO_ERROR,
+  SHELL_ERR_INVALID_ARGS,
+  SHELL_ERR_ALLOCATION_FAIL,
+  SHELL_ERR_PROC_START_FAIL,
+  SHELL_ERR_OUT_BUF_FULL,
+  SHELL_ERR_PROC_EXIT_FAIL,
+} CMDError;
+
+typedef struct commander_result CMDResult;
+struct commander_result {
+  i32 exit_code;
+  CMDError error;
+  bool exited;
+
+#ifdef WAPP_PLATFORM_WINDOWS
+  #include "misc_utils.h"
+  wapp_misc_utils_padding_size(sizeof(bool) + sizeof(i32) + sizeof(CMDError));
+#endif // !WAPP_PLATFORM_WINDOWS
+};
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !COMMANDER_OUTPUT_H

src/core/os/shell/commander/posix/commander_posix.c

@@ -0,0 +1,23 @@
+#include "../../../../../common/aliases/aliases.h"
+#include "../../../../../common/platform/platform.h"
+
+#ifdef WAPP_PLATFORM_POSIX
+
+#include "../commander_output.h"
+#include "../../utils/shell_utils.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+CMDError get_output_status(FILE *fp, i32 *status_out) {
+  *status_out = wapp_shell_utils_pclose(fp);
+
+  if (!WIFEXITED(*status_out)) {
+    return SHELL_ERR_PROC_EXIT_FAIL;
+  }
+
+  *status_out = WEXITSTATUS(*status_out);
+
+  return SHELL_ERR_NO_ERROR;
+}
+
+#endif // !WAPP_PLATFORM_POSIX

src/core/os/shell/commander/win/commander_win.c

@@ -0,0 +1,22 @@
+#include "../../../../../common/aliases/aliases.h"
+#include "../../../../../common/platform/platform.h"
+
+#ifdef WAPP_PLATFORM_WINDOWS
+
+#include "../commander_output.h"
+#include "../../utils/shell_utils.h"
+#include <stdio.h>
+
+CMDError get_output_status(FILE *fp, i32 *status_out) {
+  if (!feof(fp)) {
+    // Ensure process is closed on failure
+    wapp_shell_utils_pclose(fp);
+    return SHELL_ERR_PROC_EXIT_FAIL;
+  }
+
+  *status_out = wapp_shell_utils_pclose(fp);
+
+  return SHELL_ERR_NO_ERROR;
+}
+
+#endif // !WAPP_PLATFORM_WINDOWS

src/core/os/shell/termcolour/posix/termcolour_posix.c

@@ -0,0 +1,34 @@
+#include "../../../../../common/aliases/aliases.h"
+#include "../../../../../common/platform/platform.h"
+#include "../../../../strings/str8/str8.h"
+
+#ifdef WAPP_PLATFORM_POSIX
+
+#include "../terminal_colours.h"
+#include <stdio.h>
+
+internal Str8RO colours[COUNT_TERM_COLOUR] = {
+    [WAPP_TERM_COLOUR_FG_BLACK]      = wapp_str8_lit_ro_initialiser_list("\033[30m"),
+    [WAPP_TERM_COLOUR_FG_RED]        = wapp_str8_lit_ro_initialiser_list("\033[31m"),
+    [WAPP_TERM_COLOUR_FG_GREEN]      = wapp_str8_lit_ro_initialiser_list("\033[32m"),
+    [WAPP_TERM_COLOUR_FG_BLUE]       = wapp_str8_lit_ro_initialiser_list("\033[34m"),
+    [WAPP_TERM_COLOUR_FG_CYAN]       = wapp_str8_lit_ro_initialiser_list("\033[36m"),
+    [WAPP_TERM_COLOUR_FG_MAGENTA]    = wapp_str8_lit_ro_initialiser_list("\033[35m"),
+    [WAPP_TERM_COLOUR_FG_YELLOW]     = wapp_str8_lit_ro_initialiser_list("\033[33m"),
+    [WAPP_TERM_COLOUR_FG_WHITE]      = wapp_str8_lit_ro_initialiser_list("\033[37m"),
+    [WAPP_TERM_COLOUR_FG_BR_BLACK]   = wapp_str8_lit_ro_initialiser_list("\033[90m"),
+    [WAPP_TERM_COLOUR_FG_BR_RED]     = wapp_str8_lit_ro_initialiser_list("\033[91m"),
+    [WAPP_TERM_COLOUR_FG_BR_GREEN]   = wapp_str8_lit_ro_initialiser_list("\033[92m"),
+    [WAPP_TERM_COLOUR_FG_BR_BLUE]    = wapp_str8_lit_ro_initialiser_list("\033[94m"),
+    [WAPP_TERM_COLOUR_FG_BR_CYAN]    = wapp_str8_lit_ro_initialiser_list("\033[96m"),
+    [WAPP_TERM_COLOUR_FG_BR_MAGENTA] = wapp_str8_lit_ro_initialiser_list("\033[95m"),
+    [WAPP_TERM_COLOUR_FG_BR_YELLOW]  = wapp_str8_lit_ro_initialiser_list("\033[93m"),
+    [WAPP_TERM_COLOUR_FG_BR_WHITE]   = wapp_str8_lit_ro_initialiser_list("\033[97m"),
+    [WAPP_TERM_COLOUR_CLEAR]         = wapp_str8_lit_ro_initialiser_list("\033[0m"),
+};
+
+void print_coloured_text(Str8RO *text, TerminalColour colour) {
+  printf(WAPP_STR8_SPEC WAPP_STR8_SPEC, wapp_str8_varg(colours[colour]), wapp_str8_varg((*text)));
+}
+
+#endif // !WAPP_PLATFORM_POSIX

src/core/os/shell/termcolour/termcolour.c

@@ -0,0 +1,16 @@
+#include "termcolour.h"
+#include "terminal_colours.h"
+#include "../../../strings/str8/str8.h"
+
+void wapp_shell_termcolour_print_text(Str8RO *text, TerminalColour colour) {
+  if (colour < WAPP_TERM_COLOUR_FG_BLACK || colour > WAPP_TERM_COLOUR_FG_BR_WHITE) {
+    return;
+  }
+
+  print_coloured_text(text, colour);
+}
+
+void wapp_shell_termcolour_clear_colour(void) {
+  Str8RO empty = wapp_str8_lit_ro("");
+  print_coloured_text(&empty, WAPP_TERM_COLOUR_CLEAR);
+}

src/core/os/shell/termcolour/termcolour.h

@@ -0,0 +1,21 @@
+#ifndef TERM_COLOUR_H
+#define TERM_COLOUR_H
+
+#include "terminal_colours.h"
+#include "../../../../common/aliases/aliases.h"
+#include "../../../strings/str8/str8.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+void wapp_shell_termcolour_print_text(Str8RO *text, TerminalColour colour);
+void wapp_shell_termcolour_clear_colour(void);
+
+external void print_coloured_text(Str8RO *text, TerminalColour colour);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !TERM_COLOUR_H

src/core/os/shell/termcolour/terminal_colours.h

@@ -0,0 +1,34 @@
+#ifndef TERMINAL_COLOURS_H
+#define TERMINAL_COLOURS_H
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+typedef enum {
+  WAPP_TERM_COLOUR_FG_BLACK,
+  WAPP_TERM_COLOUR_FG_RED,
+  WAPP_TERM_COLOUR_FG_GREEN,
+  WAPP_TERM_COLOUR_FG_BLUE,
+  WAPP_TERM_COLOUR_FG_CYAN,
+  WAPP_TERM_COLOUR_FG_MAGENTA,
+  WAPP_TERM_COLOUR_FG_YELLOW,
+  WAPP_TERM_COLOUR_FG_WHITE,
+  WAPP_TERM_COLOUR_FG_BR_BLACK,
+  WAPP_TERM_COLOUR_FG_BR_RED,
+  WAPP_TERM_COLOUR_FG_BR_GREEN,
+  WAPP_TERM_COLOUR_FG_BR_BLUE,
+  WAPP_TERM_COLOUR_FG_BR_CYAN,
+  WAPP_TERM_COLOUR_FG_BR_MAGENTA,
+  WAPP_TERM_COLOUR_FG_BR_YELLOW,
+  WAPP_TERM_COLOUR_FG_BR_WHITE,
+  WAPP_TERM_COLOUR_CLEAR,
+
+  COUNT_TERM_COLOUR,
+} TerminalColour;
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !TERMINAL_COLOURS_H

src/core/os/shell/termcolour/win/termcolour_win.c

@@ -0,0 +1,71 @@
+#include "../../../../../common/aliases/aliases.h"
+#include "../../../../../common/platform/platform.h"
+#include "../../../../strings/str8/str8.h"
+
+#ifdef WAPP_PLATFORM_WINDOWS
+
+#include "../terminal_colours.h"
+#include "../../../../../common/misc/misc_utils.h"
+#include <stdio.h>
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+
+typedef struct termcolour_data TermcolourData;
+struct termcolour_data {
+  HANDLE handle;
+  WORD   default_colour;
+  WORD   current_colour;
+
+  wapp_misc_utils_padding_size(sizeof(HANDLE) + sizeof(WORD) + sizeof(WORD));
+};
+
+internal void init_data(TermcolourData *data);
+
+internal WORD colours[COUNT_TERM_COLOUR] = {
+    [WAPP_TERM_COLOUR_FG_BLACK]      = 0,
+    [WAPP_TERM_COLOUR_FG_RED]        = FOREGROUND_RED,
+    [WAPP_TERM_COLOUR_FG_GREEN]      = FOREGROUND_GREEN,
+    [WAPP_TERM_COLOUR_FG_BLUE]       = FOREGROUND_BLUE,
+    [WAPP_TERM_COLOUR_FG_CYAN]       = FOREGROUND_GREEN | FOREGROUND_BLUE,
+    [WAPP_TERM_COLOUR_FG_MAGENTA]    = FOREGROUND_RED | FOREGROUND_BLUE,
+    [WAPP_TERM_COLOUR_FG_YELLOW]     = FOREGROUND_RED | FOREGROUND_GREEN,
+    [WAPP_TERM_COLOUR_FG_WHITE]      = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE,
+    [WAPP_TERM_COLOUR_FG_BR_BLACK]   = FOREGROUND_INTENSITY,
+    [WAPP_TERM_COLOUR_FG_BR_RED]     = FOREGROUND_RED | FOREGROUND_INTENSITY,
+    [WAPP_TERM_COLOUR_FG_BR_GREEN]   = FOREGROUND_GREEN | FOREGROUND_INTENSITY,
+    [WAPP_TERM_COLOUR_FG_BR_BLUE]    = FOREGROUND_BLUE | FOREGROUND_INTENSITY,
+    [WAPP_TERM_COLOUR_FG_BR_CYAN]    = FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY,
+    [WAPP_TERM_COLOUR_FG_BR_MAGENTA] = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_INTENSITY,
+    [WAPP_TERM_COLOUR_FG_BR_YELLOW]  = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_INTENSITY,
+    [WAPP_TERM_COLOUR_FG_BR_WHITE]   = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY,
+};
+
+void print_coloured_text(Str8RO *text, TerminalColour colour) {
+  persistent TermcolourData data = {0};
+  if (data.handle == 0) {
+    init_data(&data);
+  }
+
+  if (colour == WAPP_TERM_COLOUR_CLEAR) {
+    data.current_colour = data.default_colour;
+  } else {
+    data.current_colour = colours[colour];
+  }
+
+  SetConsoleTextAttribute(data.handle, data.current_colour);
+  printf(WAPP_STR8_SPEC, wapp_str8_varg((*text)));
+}
+
+internal void init_data(TermcolourData *data) {
+  // create handle
+  data->handle = GetStdHandle(STD_OUTPUT_HANDLE);
+
+  // get console colour information
+  CONSOLE_SCREEN_BUFFER_INFO csbi;
+  GetConsoleScreenBufferInfo(data->handle, &csbi);
+  data->default_colour = csbi.wAttributes;
+  data->current_colour = data->default_colour;
+}
+
+#endif // !WAPP_PLATFORM_WINDOWS

src/core/os/shell/utils/shell_utils.h

@@ -1,16 +1,15 @@
 #ifndef SHELL_UTILS_H
 #define SHELL_UTILS_H
 
-#include "platform.h"
+#include "../../../../common/platform/platform.h"
+#include <stdio.h>
 
-// clang-format off
 #ifdef WAPP_PLATFORM_WINDOWS
-  #define wapp_shell_utils_popen _popen
+  #define wapp_shell_utils_popen  _popen
   #define wapp_shell_utils_pclose _pclose
 #else
-  #define wapp_shell_utils_popen popen
+  #define wapp_shell_utils_popen  popen
   #define wapp_shell_utils_pclose pclose
 #endif /* ifdef WAPP_PLATFORM_WINDOWS */
-// clang-format on
 
 #endif // !SHELL_UTILS_H

src/core/strings/basic_strings/basic_strings.h

@@ -1,34 +0,0 @@
-#ifndef BASIC_STRING_H
-#define BASIC_STRING_H
-
-#include "aliases.h"
-#include <stdio.h>
-#include <string.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
-
-typedef struct bstr BasicString;
-struct bstr {
-  u64 size;
-  const char *buf;
-};
-
-typedef struct strvw StringView;
-struct strvw {
-  const u64 size;
-  const char *buf;
-};
-
-#define new_string(STR)                                                        \
-  { .size = strlen(STR), .buf = STR }
-#define wapp_bstr_new(STR) ((BasicString)new_string(STR))
-#define wapp_strvw_new(STR) ((StringView)new_string(STR))
-#define wapp_string_print(STR) (printf("%.*s\n", (i32)STR.size, STR.buf))
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-
-#endif // !BASIC_STRING_H

src/core/strings/dstr/dstr.c

@@ -1,191 +0,0 @@
-#include "dstr.h"
-#include "aliases.h"
-#include "mem_arena.h"
-#include "platform.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-// Use this scalar to allocate extra memory in order to avoid having to
-// constantly reallocate
-#define CAPACITY_SCALAR 8
-#define MINIMUM_DSTR_CAPACITY 1024
-
-struct dstr {
-  u64 capacity;
-  u64 size;
-
-#ifdef WAPP_PLATFORM_WINDOWS
-  char *buf;
-#else
-  char buf[];
-#endif // WAPP_PLATFORM_WINDOWS
-};
-
-String *wapp_dstr_with_capacity(u64 capacity, Arena *arena) {
-  if (!arena) {
-    return NULL;
-  }
-
-  String *out =
-      (String *)wapp_mem_arena_alloc(arena, sizeof(String) + capacity + 1);
-  if (!out) {
-    return NULL;
-  }
-
-  out->capacity = capacity;
-  out->size = 0;
-
-  return out;
-}
-
-String *wapp_dstr_from_string(const char *str, Arena *arena) {
-  if (!str || !arena) {
-    return NULL;
-  }
-
-  u64 length = strlen(str);
-  u64 capacity = length * CAPACITY_SCALAR;
-  capacity =
-      capacity >= MINIMUM_DSTR_CAPACITY ? capacity : MINIMUM_DSTR_CAPACITY;
-
-  String *out = wapp_dstr_with_capacity(capacity, arena);
-  if (!out) {
-    return NULL;
-  }
-
-  out->size = length;
-  strncpy(out->buf, str, length + 1);
-
-  return out;
-}
-
-StringUpdate wapp_dstr_update(String **dst, const char *src, Arena *arena) {
-  if (!dst || !(*dst)) {
-    return (StringUpdate){.updated = false, .str = *dst};
-  }
-
-  u64 length = strlen(src);
-
-  String *str = *dst;
-
-  if (length >= str->capacity) {
-    if (!arena) {
-      return (StringUpdate){.updated = false, .str = *dst};
-    }
-
-    String *new_str = wapp_dstr_from_string(src, arena);
-    if (!new_str) {
-      return (StringUpdate){.updated = false, .str = *dst};
-    }
-
-    return (StringUpdate){.updated = true, .str = new_str};
-  }
-
-  memset(str->buf, 0, str->capacity);
-
-  str->size = length;
-
-  strncpy(str->buf, src, length + 1);
-
-  return (StringUpdate){.updated = true, .str = *dst};
-}
-
-StringUpdate wapp_dstr_concat(String **dst, const char *src, Arena *arena) {
-  if (!dst || !(*dst)) {
-    return (StringUpdate){.updated = false, .str = *dst};
-  }
-
-  u64 src_length = strlen(src);
-  if (src_length == 0) {
-    return (StringUpdate){.updated = false, .str = *dst};
-  }
-
-  u64 new_length = (*dst)->size + src_length;
-
-#ifdef WAPP_PLATFORM_WINDOWS
-  char *str =
-      wapp_mem_util_alloc(NULL, new_length + 1, WAPP_MEM_ACCESS_READ_WRITE,
-                          WAPP_MEM_ALLOC_RESERVE | WAPP_MEM_ALLOC_COMMIT,
-                          WAPP_MEM_INIT_INITIALISED);
-
-  if (!str) {
-    return (StringUpdate){.updated = false, .str = *dst};
-  }
-#else
-  char str[new_length + 1];
-  memset(str, 0, new_length + 1);
-#endif /* ifdef WAPP_PLATFORM_WINDOWS */
-
-  strncpy(str, (*dst)->buf, (*dst)->size);
-  strncat(str, src, new_length + 1 - (*dst)->size);
-
-  return wapp_dstr_update(dst, str, arena);
-}
-
-void wapp_dstr_clear(String *str) {
-  if (!str || str->size == 0) {
-    return;
-  }
-
-  memset(str->buf, 0, str->capacity);
-  str->size = 0;
-}
-
-void wapp_dstr_print(const String *str) {
-  if (!str) {
-    return;
-  }
-
-  printf("%.*s\n", (i32)str->size, str->buf);
-}
-
-i64 wapp_dstr_find(const String *str, const char *substr) {
-  if (!str || !substr) {
-    return -1;
-  }
-
-  u64 substr_length = strlen(substr);
-  if (substr_length == 0 || substr_length > str->size) {
-    return -1;
-  }
-
-  const char *s1;
-  for (u64 i = 0; i < str->size; ++i) {
-    if (i + substr_length > str->size) {
-      break;
-    }
-
-    s1 = &(str->buf[i]);
-
-    if (strncmp(s1, substr, substr_length) == 0) {
-      return i;
-    }
-  }
-
-  return -1;
-}
-
-u64 wapp_dstr_length(const String *str) {
-  if (!str) {
-    return 0;
-  }
-
-  return str->size;
-}
-
-u64 wapp_dstr_capacity(const String *str) {
-  if (!str) {
-    return 0;
-  }
-
-  return str->capacity;
-}
-
-const char *wapp_dstr_to_cstr(const String *str) {
-  if (!str) {
-    return "";
-  }
-
-  return str->buf;
-}

src/core/strings/dstr/dstr.h

@@ -1,41 +0,0 @@
-#ifndef DSTR_H
-#define DSTR_H
-
-#include "aliases.h"
-#include "mem_arena.h"
-#include "misc_utils.h"
-#include "platform.h"
-#include <stdbool.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
-
-typedef struct dstr String;
-
-typedef struct string_update StringUpdate;
-struct string_update {
-  String *str;
-  bool updated;
-
-#ifdef WAPP_PLATFORM_WINDOWS
-  wapp_misc_utils_padding_size(sizeof(bool) + sizeof(String *));
-#endif // WAPP_PLATFORM_WINDOWS
-};
-
-String *wapp_dstr_with_capacity(u64 capacity, Arena *arena);
-String *wapp_dstr_from_string(const char *str, Arena *arena);
-StringUpdate wapp_dstr_update(String **dst, const char *src, Arena *arena);
-StringUpdate wapp_dstr_concat(String **dst, const char *src, Arena *arena);
-void wapp_dstr_clear(String *str);
-void wapp_dstr_print(const String *str);
-i64 wapp_dstr_find(const String *str, const char *substr);
-u64 wapp_dstr_length(const String *str);
-u64 wapp_dstr_capacity(const String *str);
-const char *wapp_dstr_to_cstr(const String *str);
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-
-#endif // !DSTR_H

src/core/strings/str8/str8.c

@@ -0,0 +1,437 @@
+#include "str8.h"
+#include "str8_list.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../containers/dbl_list/dbl_list.h"
+#include "../../mem/allocator/mem_allocator.h"
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+
+#define STR8_BUF_ALLOC_SIZE(CAPACITY) (sizeof(Str8) + sizeof(c8) * CAPACITY)
+
+Str8 *wapp_str8_alloc_buf(const Allocator *allocator, u64 capacity) {
+  Str8 *str = NULL;
+
+  if (!allocator) {
+    goto RETURN_STR8;
+  }
+
+  str = wapp_mem_allocator_alloc(allocator, STR8_BUF_ALLOC_SIZE(capacity));
+  if (!str) {
+    goto RETURN_STR8;
+  }
+
+  str->buf      = (u8 *)str + sizeof(Str8);
+  str->size     = 0;
+  str->capacity = capacity;
+
+RETURN_STR8:
+  return str;
+}
+
+Str8 *wapp_str8_alloc_cstr(const Allocator *allocator, const char *str) {
+  Str8 *output = NULL;
+
+  if (!allocator || !str) {
+    goto RETURN_ALLOC_CSTR;
+  }
+
+  u64 length = strlen(str);
+  output     = wapp_str8_alloc_buf(allocator, length * 2);
+  if (!output) {
+    goto RETURN_ALLOC_CSTR;
+  }
+
+  output->size = length;
+  memcpy(output->buf, str, length);
+
+RETURN_ALLOC_CSTR:
+  return output;
+}
+
+Str8 *wapp_str8_alloc_str8(const Allocator *allocator, Str8RO *str) {
+  Str8 *output = NULL;
+
+  if (!allocator || !str) {
+    goto RETURN_ALLOC_STR8;
+  }
+
+  output = wapp_str8_alloc_buf(allocator, str->capacity);
+  if (!output) {
+    goto RETURN_ALLOC_STR8;
+  }
+
+  output->size = str->size;
+  memcpy(output->buf, str->buf, str->size);
+
+RETURN_ALLOC_STR8:
+  return output;
+}
+
+Str8 *wapp_str8_alloc_substr(const Allocator *allocator, Str8RO *str, u64 start, u64 end) {
+  Str8 *output = NULL;
+  if (!allocator || !str) {
+    goto RETURN_ALLOC_SUBSTR;
+  }
+
+  if (start >= str->size || start >= end) {
+    goto RETURN_ALLOC_SUBSTR;
+  }
+
+  if (end > str->size) {
+    end = str->size;
+  }
+
+  output = wapp_str8_alloc_buf(allocator, str->capacity);
+  if (!output) {
+    goto RETURN_ALLOC_SUBSTR;
+  }
+
+  output->size = end - start;
+  memcpy(output->buf, str->buf + start, output->size);
+
+RETURN_ALLOC_SUBSTR:
+  return output;
+}
+
+void wapp_str8_dealloc_buf(const Allocator *allocator, Str8 **str) {
+  if (!allocator || !str || !(*str)) {
+    return;
+  }
+
+  wapp_mem_allocator_free(allocator, (void **)str, STR8_BUF_ALLOC_SIZE((*str)->capacity));
+}
+
+c8 wapp_str8_get(const Str8 *str, u64 index) {
+  if (index >= str->size) {
+    return '\0';
+  }
+
+  return str->buf[index];
+}
+
+void wapp_str8_set(Str8 *str, u64 index, c8 c) {
+  if (index >= str->size) {
+    return;
+  }
+
+  str->buf[index] = c;
+}
+
+void wapp_str8_push_back(Str8 *str, c8 c) {
+  if (!(str->size < str->capacity)) {
+    return;
+  }
+
+  u64 index = (str->size)++;
+  wapp_str8_set(str, index, c);
+}
+
+bool wapp_str8_equal(Str8RO *s1, Str8RO *s2) {
+  if (s1->size != s2->size) {
+    return false;
+  }
+
+  return wapp_str8_equal_to_count(s1, s2, s1->size);
+}
+
+bool wapp_str8_equal_to_count(Str8RO* s1, Str8RO* s2, u64 count) {
+    if (!s1 || !s2) {
+        return false;
+    }
+
+    return memcmp(s1->buf, s2->buf, count) == 0;
+}
+
+Str8 wapp_str8_slice(Str8RO *str, u64 start, u64 end) {
+  if (start >= str->size || start >= end) {
+    start = str->size;
+    end   = str->size;
+  }
+
+  if (end > str->size) {
+    end = str->size;
+  }
+
+  return (Str8RO){
+    .capacity = end - start,
+    .size     = end - start,
+    .buf      = str->buf + start,
+  };
+}
+
+Str8 *wapp_str8_alloc_concat(const Allocator *allocator, Str8 *dst, Str8RO *src) {
+  if (!allocator || !dst || !src) {
+    return NULL;
+  }
+
+  Str8 *output  = NULL;
+  u64 remaining = dst->capacity - dst->size;
+  if (src->size <= remaining) {
+    output = dst;
+    goto COPY_STRING_STR8_CONCAT;
+  }
+
+  u64 capacity = dst->capacity + src->size;
+
+  output = wapp_str8_alloc_buf(allocator, capacity);
+  if (!output) {
+    goto RETURN_STR8_CONCAT;
+  }
+
+  wapp_str8_concat_capped(output, dst);
+
+COPY_STRING_STR8_CONCAT:
+  wapp_str8_concat_capped(output, src);
+
+RETURN_STR8_CONCAT:
+  return output;
+}
+
+void wapp_str8_concat_capped(Str8 *dst, Str8RO *src) {
+  if (!dst || !src) {
+    return;
+  }
+
+  u64 remaining = dst->capacity - dst->size;
+  u64 to_copy   = remaining < src->size ? remaining : src->size;
+
+  memcpy(dst->buf + dst->size, src->buf, to_copy);
+  dst->size += to_copy;
+}
+
+void wapp_str8_copy_cstr_capped(Str8 *dst, const char *src) {
+  if (!dst || !src) {
+    return;
+  }
+
+  u64 length  = strlen(src);
+  u64 to_copy = length <= dst->capacity ? length : dst->capacity;
+
+  memset(dst->buf, 0, dst->size);
+  memcpy(dst->buf, src, to_copy);
+  dst->size = to_copy;
+}
+
+void wapp_str8_copy_str8_capped(Str8 *dst, Str8RO *src) {
+  if (!dst || !src) {
+    return;
+  }
+
+  u64 to_copy = src->size <= dst->capacity ? src->size : dst->capacity;
+
+  memset(dst->buf, 0, dst->size);
+  memcpy(dst->buf, src->buf, to_copy);
+  dst->size = to_copy;
+}
+
+void wapp_str8_copy_to_cstr(char *dst, Str8RO *src, u64 dst_capacity) {
+  if (!dst || !src) {
+    return;
+  }
+
+  u64 to_copy = src->size < dst_capacity ? src->size : dst_capacity - 1;
+
+  memset(dst, 0, dst_capacity);
+  memcpy(dst, src->buf, to_copy);
+}
+
+void wapp_str8_format(Str8 *dst, const char *format, ...) {
+  if (!dst || !format) {
+    return;
+  }
+
+  va_list args1;
+  va_list args2;
+
+  va_start(args1, format);
+  va_copy(args2, args1);
+
+  u64 total_size = vsnprintf(NULL, 0, format, args1);
+  dst->size      = total_size <= dst->capacity ? total_size : dst->capacity;
+
+  vsnprintf((char *)(dst->buf), dst->capacity, format, args2);
+
+  va_end(args1);
+  va_end(args2);
+}
+
+i64 wapp_str8_find(Str8RO *str, Str8RO substr) {
+  if (!str || substr.size > str->size) {
+    return -1;
+  }
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  u64 char_index = 0;
+  bool running   = true;
+  while (running) {
+    const c8 *sub = str->buf + char_index;
+    if (memcmp(sub, substr.buf, substr.size) == 0) {
+      return char_index;
+    }
+
+    ++char_index;
+    running = char_index < str->size;
+  }
+
+  return -1;
+}
+
+i64 wapp_str8_rfind(Str8RO *str, Str8RO substr) {
+  if (!str || substr.size > str->size) {
+    return -1;
+  }
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  i64 char_index = str->size - substr.size;
+  bool running   = true;
+  while (running) {
+    const c8 *sub = str->buf + char_index;
+    if (memcmp(sub, substr.buf, substr.size) == 0) {
+      return char_index;
+    }
+
+    --char_index;
+    running = char_index >= 0;
+  }
+
+  return -1;
+}
+
+DBL_LIST(Str8) *wapp_str8_split_with_max(const Allocator *allocator, Str8RO *str, Str8RO *delimiter, i64 max_splits) {
+  if (!allocator || !str || !delimiter) {
+    return NULL;
+  }
+
+  DBL_LIST(Str8) *output = wapp_mem_allocator_alloc(allocator, sizeof(DBL_LIST(Str8)));
+
+  if (delimiter->size > str->size) {
+    Str8 *full     = wapp_str8_alloc_str8(allocator, str);
+    DBL_NODE(Str8) *node = wapp_mem_allocator_alloc(allocator, sizeof(DBL_NODE(Str8)));
+    if (node) {
+      node->item = full;
+      wapp_dbl_list_push_back(output, node);
+    }
+
+    goto RETURN_STR8_SPLIT;
+  }
+
+  i64 start   = 0;
+  i64 end     = 0;
+  i64 splits  = 0;
+  Str8 *rest = wapp_str8_alloc_str8(allocator, str);
+  Str8 *before_str;
+
+  while ((end = wapp_str8_find(rest, *delimiter)) != -1) {
+    if (max_splits > 0 && splits >= max_splits) {
+      break;
+    }
+
+    before_str     = wapp_str8_alloc_substr(allocator, str, start, start + end);
+    DBL_NODE(Str8) *node = wapp_mem_allocator_alloc(allocator, sizeof(DBL_NODE(Str8)));
+    if (node) {
+      node->item = before_str;
+      wapp_dbl_list_push_back(output, node);
+    }
+
+    wapp_mem_allocator_free(allocator, (void **)&rest, sizeof(Str8));
+    rest   = wapp_str8_alloc_substr(allocator, str, start + end + delimiter->size, str->size);
+    start += end + delimiter->size;
+
+    ++splits;
+  }
+
+  // Ensure the last part of the string after the delimiter is added to the list
+  rest                 = wapp_str8_alloc_substr(allocator, str, start, str->size);
+  DBL_NODE(Str8) *node = wapp_mem_allocator_alloc(allocator, sizeof(DBL_NODE(Str8)));
+  if (node) {
+    node->item = rest;
+    wapp_dbl_list_push_back(output, node);
+  }
+
+RETURN_STR8_SPLIT:
+  return output;
+}
+
+DBL_LIST(Str8) *wapp_str8_rsplit_with_max(const Allocator *allocator, Str8RO *str, Str8RO *delimiter, i64 max_splits) {
+  if (!allocator || !str || !delimiter) {
+    return NULL;
+  }
+
+  DBL_LIST(Str8) *output = wapp_mem_allocator_alloc(allocator, sizeof(DBL_LIST(Str8)));
+
+  if (delimiter->size > str->size) {
+    Str8 *full     = wapp_str8_alloc_str8(allocator, str);
+    DBL_NODE(Str8) *node = wapp_mem_allocator_alloc(allocator, sizeof(DBL_NODE(Str8)));
+    if (node) {
+      node->item = full;
+      wapp_dbl_list_push_back(output, node);
+    }
+
+    goto RETURN_STR8_SPLIT;
+  }
+
+  i64 end     = 0;
+  i64 splits  = 0;
+  Str8 *rest = wapp_str8_alloc_str8(allocator, str);
+  Str8 *after_str;
+
+  while ((end = wapp_str8_rfind(rest, *delimiter)) != -1) {
+    if (max_splits > 0 && splits >= max_splits) {
+      break;
+    }
+
+    after_str     = wapp_str8_alloc_substr(allocator, rest, end + delimiter->size, str->size);
+    DBL_NODE(Str8) *node = wapp_mem_allocator_alloc(allocator, sizeof(DBL_NODE(Str8)));
+    if (node) {
+      node->item = after_str;
+      wapp_dbl_list_push_front(output, node);
+    }
+
+    wapp_mem_allocator_free(allocator, (void **)&rest, sizeof(Str8));
+    rest   = wapp_str8_alloc_substr(allocator, rest, 0, end);
+
+    ++splits;
+  }
+
+  rest           = wapp_str8_alloc_substr(allocator, str, 0, rest->size);
+  DBL_NODE(Str8) *node = wapp_mem_allocator_alloc(allocator, sizeof(DBL_NODE(Str8)));
+  if (node) {
+    node->item = rest;
+    wapp_dbl_list_push_front(output, node);
+  }
+
+RETURN_STR8_SPLIT:
+  return output;
+}
+
+Str8 *wapp_str8_join(const Allocator *allocator, const DBL_LIST(Str8) *list, Str8RO *delimiter) {
+  if (!allocator || !list || !delimiter) {
+    return NULL;
+  }
+
+  u64 capacity = wapp_str8_list_total_size(list) + (delimiter->size * (list->node_count - 1));
+  Str8 *output = wapp_str8_alloc_buf(allocator, capacity * 2);
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  DBL_NODE(Str8) *node;
+  u64 node_index = 0;
+  bool running   = true;
+  while (running) {
+    node = wapp_dbl_list_get(Str8, list, node_index);
+    wapp_str8_concat_capped(output, node->item);
+    if (node_index + 1 < list->node_count) {
+      wapp_str8_concat_capped(output, delimiter);
+    }
+
+    ++node_index;
+    running = node_index < list->node_count;
+  }
+
+  return output;
+}

src/core/strings/str8/str8.h

@@ -0,0 +1,102 @@
+#ifndef STR8_H
+#define STR8_H
+
+#include "./str8_list.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../containers/dbl_list/dbl_list.h"
+#include "../../mem/allocator/mem_allocator.h"
+#include <string.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // !__cplusplus
+
+typedef struct str8 Str8;
+struct str8 {
+  u64 capacity;
+  u64 size;
+  c8 *buf;
+};
+
+typedef const Str8 Str8RO;
+
+/**
+ * Utilities to be used with printf functions
+ */
+#define WAPP_STR8_SPEC "%.*s"
+#define wapp_str8_varg(STRING) (int)((STRING).size), (STRING).buf
+
+/**
+ * Str8 stack buffers
+ */
+#define wapp_str8_buf(CAPACITY) ((Str8){.capacity = CAPACITY, .size = 0, .buf = (c8[CAPACITY]){0}})
+
+// Utilises the fact that memcpy returns pointer to dest buffer and that getting
+// address of compound literals is valid in C to create a string on the stack
+#define wapp_str8_lit(STRING) ((Str8){.capacity = (sizeof(STRING) - 1) * 2, \
+                                      .size     = sizeof(STRING) - 1,       \
+                                      .buf      = memcpy(&((c8 [sizeof(STRING) * 2]){0}), STRING, sizeof(STRING))})
+#define wapp_str8_lit_ro(STRING) ((Str8RO){.capacity = sizeof(STRING) - 1, \
+                                           .size     = sizeof(STRING) - 1, \
+                                           .buf      = (c8 *)STRING})
+// To be used only when initialising a static storage variable in compilers that don't support
+// initialisers with the syntax of wapp_str8_lit_ro (e.g. gcc). Should only be used when necessary
+// and only be assigned to a Str8RO variable to avoid any attempt at modifying the string
+#define wapp_str8_lit_ro_initialiser_list(STRING) {.capacity = sizeof(STRING) - 1, \
+                                                   .size     = sizeof(STRING) - 1, \
+                                                   .buf      = (c8 *)STRING}
+
+/**
+ * Str8 allocated buffers
+ */
+Str8 *wapp_str8_alloc_buf(const Allocator *allocator, u64 capacity);
+Str8 *wapp_str8_alloc_cstr(const Allocator *allocator, const char *str);
+Str8 *wapp_str8_alloc_str8(const Allocator *allocator, Str8RO *str);
+Str8 *wapp_str8_alloc_substr(const Allocator *allocator, Str8RO *str, u64 start, u64 end);
+Str8 *wapp_str8_alloc_concat(const Allocator *allocator, Str8 *dst, Str8RO *src);
+// Only needed for allocators like malloc where each allocation has to be freed on its own.
+// No need to use it for allocators like Arena.
+void wapp_str8_dealloc_buf(const Allocator *allocator, Str8 **str);
+
+/**
+ * Str8 utilities
+ */
+c8   wapp_str8_get(Str8RO *str, u64 index);
+void wapp_str8_set(Str8 *str, u64 index, c8 c);
+void wapp_str8_push_back(Str8 *str, c8 c);
+bool wapp_str8_equal(Str8RO *s1, Str8RO *s2);
+bool wapp_str8_equal_to_count(Str8RO* s1, Str8RO* s2, u64 count);
+Str8 wapp_str8_slice(Str8RO *str, u64 start, u64 end);
+void wapp_str8_concat_capped(Str8 *dst, Str8RO *src);
+void wapp_str8_copy_cstr_capped(Str8 *dst, const char *src);
+void wapp_str8_copy_str8_capped(Str8 *dst, Str8RO *src);
+void wapp_str8_copy_to_cstr(char *dst, Str8RO *src, u64 dst_capacity);
+void wapp_str8_format(Str8 *dst, const char *format, ...);
+
+/**
+ * Str8 find functions
+ */
+i64 wapp_str8_find(Str8RO *str, Str8RO substr);
+i64 wapp_str8_rfind(Str8RO *str, Str8RO substr);
+
+/**
+ * Str8 split and join
+ */
+#define wapp_str8_split(ALLOCATOR, STR, DELIMITER) wapp_str8_split_with_max(ALLOCATOR, STR, DELIMITER, -1)
+#define wapp_str8_rsplit(ALLOCATOR, STR, DELIMITER) wapp_str8_rsplit_with_max(ALLOCATOR, STR, DELIMITER, -1)
+DBL_LIST(Str8) *wapp_str8_split_with_max(const Allocator *allocator, Str8RO *str, Str8RO *delimiter, i64 max_splits);
+DBL_LIST(Str8) *wapp_str8_rsplit_with_max(const Allocator *allocator, Str8RO *str, Str8RO *delimiter, i64 max_splits);
+Str8           *wapp_str8_join(const Allocator *allocator, const DBL_LIST(Str8) *list, Str8RO *delimiter);
+
+/**
+ * Str8 list utilities
+ */
+#define wapp_str8_node_from_cstr(STRING) wapp_dbl_list_node_from_item(Str8, &wapp_str8_lit(STRING))
+#define wapp_str8_node_from_str8(STRING) wapp_dbl_list_node_from_item(Str8, &(STRING))
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // !__cplusplus
+
+#endif // !STR8_H

src/core/strings/str8/str8_list.c

@@ -0,0 +1,18 @@
+#include "./str8_list.h"
+#include "./str8.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../containers/dbl_list/dbl_list.h"
+
+u64 wapp_str8_list_total_size(const DBL_LIST(Str8) *list) {
+	if (!list) {
+		return 0;
+	}
+
+	u64 output = 0;
+	for (u64 i = 0; i < list->node_count; ++i) {
+		DBL_NODE(Str8) *node = wapp_dbl_list_get(Str8, list, i);
+		output += node->item->size;
+	}
+
+	return output;
+}

src/core/strings/str8/str8_list.h

@@ -0,0 +1,25 @@
+/**
+ * THIS FILE IS AUTOMATICALLY GENERATED. ANY MODIFICATIONS TO IT WILL BE OVERWRITTEN
+ */
+
+#ifndef STR8_LIST_H
+#define STR8_LIST_H
+
+#include "../../../common/aliases/aliases.h"
+#include "../../../containers/dbl_list/dbl_list.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // !__cplusplus
+
+typedef struct str8 Str8;
+
+DBL_LIST_DECL(Str8);
+
+u64 wapp_str8_list_total_size(const DBL_LIST(Str8) *list);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // !__cplusplus
+
+#endif // !STR8_LIST_H

src/core/wapp_core.c

@@ -0,0 +1,22 @@
+#ifndef WAPP_CORE_C
+#define WAPP_CORE_C
+
+#include "wapp_core.h"
+#include "strings/str8/str8.c"
+#include "strings/str8/str8_list.c"
+#include "os/shell/termcolour/posix/termcolour_posix.c"
+#include "os/shell/termcolour/win/termcolour_win.c"
+#include "os/shell/termcolour/termcolour.c"
+#include "os/shell/commander/posix/commander_posix.c"
+#include "os/shell/commander/win/commander_win.c"
+#include "os/shell/commander/commander.c"
+#include "os/cpath/cpath.c"
+#include "os/mem/posix/mem_os_posix.c"
+#include "os/mem/win/mem_os_win.c"
+#include "os/mem/mem_os.c"
+#include "mem/utils/mem_utils.c"
+#include "mem/allocator/mem_allocator.c"
+#include "mem/arena/mem_arena.c"
+#include "mem/arena/mem_arena_allocator.c"
+
+#endif // !WAPP_CORE_C

src/core/wapp_core.h

@@ -0,0 +1,22 @@
+#ifndef WAPP_CORE_H
+#define WAPP_CORE_H
+
+#include "strings/str8/str8.h"
+#include "strings/str8/str8_list.h"
+#include "os/shell/termcolour/termcolour.h"
+#include "os/shell/termcolour/terminal_colours.h"
+#include "os/shell/commander/commander.h"
+#include "os/shell/commander/commander_output.h"
+#include "os/shell/utils/shell_utils.h"
+#include "os/cpath/cpath.h"
+#include "os/mem/posix/mem_os_posix.h"
+#include "os/mem/win/mem_os_win.h"
+#include "os/mem/mem_os_ops.h"
+#include "os/mem/mem_os.h"
+#include "mem/utils/mem_utils.h"
+#include "mem/allocator/mem_allocator.h"
+#include "mem/arena/mem_arena_allocator.h"
+#include "mem/arena/mem_arena.h"
+#include "../common/wapp_common.h"
+
+#endif // !WAPP_CORE_H

src/prng/wapp_prng.c

@@ -0,0 +1,6 @@
+#ifndef WAPP_PRNG_C
+#define WAPP_PRNG_C
+
+#include "xorshift/xorshift.c"
+
+#endif // !WAPP_PRNG_C

src/prng/wapp_prng.h

@@ -0,0 +1,7 @@
+#ifndef WAPP_PRNG_H
+#define WAPP_PRNG_H
+
+#include "xorshift/xorshift.h"
+#include "../common/wapp_common.h"
+
+#endif // !WAPP_PRNG_H

src/prng/xorshift/xorshift.c

@@ -0,0 +1,89 @@
+#include "xorshift.h"
+#include "../../common/aliases/aliases.h"
+#include <stdbool.h>
+#include <stdlib.h>
+#include <time.h>
+
+typedef struct split_mix_64_state SplitMix64State;
+struct split_mix_64_state {
+  u64 seed;
+};
+
+internal u64 rol64(u64 x, u64 bits);
+internal u64 split_mix_64(SplitMix64State *state);
+
+XOR256State wapp_prng_xorshift_init_state(void) {
+  persistent bool seeded = false;
+  if (!seeded) {
+    seeded = true;
+
+    struct timespec ts = {0};
+    clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+
+    srand48(ts.tv_nsec);
+  }
+
+  SplitMix64State sm64 = {.seed = lrand48()};
+
+  return (XOR256State){
+      .x = split_mix_64(&sm64),
+      .y = split_mix_64(&sm64),
+      .z = split_mix_64(&sm64),
+      .w = split_mix_64(&sm64),
+  };
+}
+
+u64 wapp_prng_xorshift_256(XOR256State *state) {
+  u64 t = state->x ^ (state->x << 11);
+
+  state->x = state->y;
+  state->y = state->z;
+  state->z = state->w;
+  state->w = (state->w ^ (state->w >> 19)) ^ (t ^ (t >> 8));
+
+  return state->w;
+}
+
+u64 wapp_prng_xorshift_256ss(XOR256State *state) {
+  const u64 result = rol64(state->z * 5, 7) * 9;
+  const u64 t = state->z << 17;
+
+  state->y ^= state->w;
+  state->x ^= state->z;
+  state->z ^= state->y;
+  state->w ^= state->x;
+
+  state->y ^= t;
+  state->x = rol64(state->x, 45);
+
+  return result;
+}
+
+u64 wapp_prng_xorshift_256p(XOR256State *state) {
+  const u64 result = state->w + state->x;
+  const u64 t = state->z << 17;
+
+  state->y ^= state->w;
+  state->x ^= state->z;
+  state->z ^= state->y;
+  state->w ^= state->x;
+
+  state->y ^= t;
+  state->x = rol64(state->x, 45);
+
+  return result;
+}
+
+internal u64 rol64(u64 x, u64 bits) {
+  return (x << bits) | (x >> (64 - bits));
+}
+
+internal u64 split_mix_64(SplitMix64State *state) {
+  state->seed += 0x9E3779B97f4A7C15;
+
+  u64 result = state->seed;
+  result = (result ^ (result >> 30)) * 0xBF58476D1CE4E5B9;
+  result = (result ^ (result >> 27)) * 0x94D049BB133111EB;
+
+  return result ^ (result >> 31);
+}

src/prng/xorshift/xorshift.h

@@ -0,0 +1,27 @@
+#ifndef XORSHIFT_H
+#define XORSHIFT_H
+
+#include "../../common/aliases/aliases.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+typedef struct xor_256_state XOR256State;
+struct xor_256_state {
+  u64 x;
+  u64 y;
+  u64 z;
+  u64 w;
+};
+
+XOR256State wapp_prng_xorshift_init_state(void);
+u64 wapp_prng_xorshift_256(XOR256State *state);
+u64 wapp_prng_xorshift_256ss(XOR256State *state);
+u64 wapp_prng_xorshift_256p(XOR256State *state);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !XORSHIFT_H

src/tester/tester.c

@@ -1,57 +0,0 @@
-#include "tester.h"
-#include "aliases.h"
-#include "platform.h"
-#include "termcolour.h"
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-internal void handle_test_result(TerminalColourist *colourist,
-                                 TestFuncResult result);
-
-void run_tests(TestFunc *func1, ...) {
-  TerminalColourist colourist = wapp_shell_termcolour_get_colourist();
-
-  printf("\n");
-
-  handle_test_result(&colourist, func1());
-
-  va_list args;
-  va_start(args, func1);
-
-  TestFunc *func = va_arg(args, TestFunc *);
-
-  while (func) {
-    TestFuncResult result = func();
-    handle_test_result(&colourist, result);
-
-    func = va_arg(args, TestFunc *);
-  }
-
-  va_end(args);
-
-  printf("\n");
-}
-
-internal void handle_test_result(TerminalColourist *colourist,
-                                 TestFuncResult result) {
-  TerminalColour colour;
-  const char *result_text;
-
-  if (result.passed) {
-    colour = WAPP_TERM_COLOUR_FG_BR_GREEN;
-    result_text = "PASSED";
-  } else {
-    colour = WAPP_TERM_COLOUR_FG_BR_RED;
-    result_text = "FAILED";
-  }
-
-  printf("[");
-  wapp_shell_termcolour_print_text(colourist, result_text, colour);
-  wapp_shell_termcolour_clear_colour(colourist);
-  printf("] %s\n", result.name);
-
-  if (!result.passed) {
-    exit(EXIT_FAILURE);
-  }
-}

src/testing/tester/tester.c

@@ -0,0 +1,53 @@
+#include "tester.h"
+#include "../../common/aliases/aliases.h"
+#include "../../core/os/shell/termcolour/termcolour.h"
+#include "../../core/strings/str8/str8.h"
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+internal void handle_test_result(TestFuncResult result);
+
+void run_tests(TestFunc *func1, ...) {
+  printf("\n");
+
+  handle_test_result(func1());
+
+  va_list args;
+  va_start(args, func1);
+
+  TestFunc *func = va_arg(args, TestFunc *);
+
+  while (func) {
+    TestFuncResult result = func();
+    handle_test_result(result);
+
+    func = va_arg(args, TestFunc *);
+  }
+
+  va_end(args);
+
+  printf("\n");
+}
+
+internal void handle_test_result(TestFuncResult result) {
+  TerminalColour colour;
+  Str8 result_text = wapp_str8_buf(64);
+
+  if (result.passed) {
+    colour = WAPP_TERM_COLOUR_FG_BR_GREEN;
+    wapp_str8_copy_cstr_capped(&result_text, "PASSED");
+  } else {
+    colour = WAPP_TERM_COLOUR_FG_BR_RED;
+    wapp_str8_copy_cstr_capped(&result_text, "FAILED");
+  }
+
+  printf("[");
+  wapp_shell_termcolour_print_text(&result_text, colour);
+  wapp_shell_termcolour_clear_colour();
+  printf("] " WAPP_STR8_SPEC "\n", wapp_str8_varg(result.name));
+
+  if (!result.passed) {
+    exit(EXIT_FAILURE);
+  }
+}

src/testing/tester/tester.h

@@ -1,25 +1,25 @@
 #ifndef TESTER_H
 #define TESTER_H
 
-#include "misc_utils.h"
-#include "platform.h"
+#include "../../common/misc/misc_utils.h"
+#include "../../common/platform/platform.h"
+#include "../../core/strings/str8/str8.h"
 #include <stdbool.h>
 
 #ifdef __cplusplus
-extern "C" {
+BEGIN_C_LINKAGE
 #endif // __cplusplus
 
-#define wapp_tester_result(PASSED)                                             \
-  ((TestFuncResult){.name = __func__, .passed = PASSED})
+#define wapp_tester_result(PASSED) ((TestFuncResult){.name = wapp_str8_lit_ro(__func__), .passed = PASSED})
 #define wapp_tester_run_tests(...) run_tests(__VA_ARGS__, NULL)
 
 typedef struct test_func_result TestFuncResult;
 struct test_func_result {
-  const char *name;
+  Str8RO name;
   bool passed;
 
 #ifdef WAPP_PLATFORM_WINDOWS
-  wapp_misc_utils_padding_size(sizeof(const char *) + sizeof(bool));
+  wapp_misc_utils_padding_size(sizeof(Str8RO) + sizeof(bool));
 #endif // WAPP_PLATFORM_WINDOWS
 };
 
@@ -28,7 +28,7 @@ typedef TestFuncResult(TestFunc)(void);
 void run_tests(TestFunc *func1, ...);
 
 #ifdef __cplusplus
-}
+END_C_LINKAGE
 #endif // __cplusplus
 
 #endif // !TESTER_H

src/testing/wapp_testing.c

@@ -0,0 +1,8 @@
+#ifndef WAPP_TESTING_C
+#define WAPP_TESTING_C
+
+#include "wapp_testing.h"
+#include "tester/tester.c"
+#include "../core/wapp_core.c"
+
+#endif // !WAPP_TESTING_C

src/testing/wapp_testing.h

@@ -0,0 +1,8 @@
+#ifndef WAPP_TESTING_H
+#define WAPP_TESTING_H
+
+#include "tester/tester.h"
+#include "../common/wapp_common.h"
+#include "../core/wapp_core.h"
+
+#endif // !WAPP_TESTING_H

src/uuid/uuid.c

@@ -0,0 +1,59 @@
+#include "uuid.h"
+#include "../common/aliases/aliases.h"
+#include "../core/strings/str8/str8.h"
+#include "../prng/xorshift/xorshift.h"
+#include <stdbool.h>
+#include <inttypes.h>
+
+#define UUID_STR_FORMAT ("%.8" PRIx64 "-%.4" PRIx64 "-%.4" PRIx64 "-%.4" PRIx64 "-%.12" PRIx64)
+
+typedef struct uuid4 UUID4;
+struct uuid4 {
+  u64 high;
+  u64 low;
+};
+
+internal UUID4 generate_uuid4(void);
+internal void  uuid4_to_uuid(const UUID4* uuid4, UUID *uuid);
+
+UUID *wapp_uuid_init_uuid4(UUID *uuid) {
+	if (!uuid) {
+		goto RETURN_INIT_UUID4;
+	}
+
+  UUID4 uuid4 = generate_uuid4();
+  uuid4_to_uuid(&uuid4, uuid);
+
+RETURN_INIT_UUID4:
+	return uuid;
+}
+
+internal UUID4 generate_uuid4(void) {
+  persistent XOR256State state = {0};
+  persistent bool initialised = false;
+
+  if (!initialised) {
+    initialised = true;
+    state       = wapp_prng_xorshift_init_state();
+  }
+
+  UUID4 uuid = (UUID4){
+    .high = wapp_prng_xorshift_256(&state),
+    .low  = wapp_prng_xorshift_256(&state),
+  };
+
+  uuid.high = (uuid.high & 0xffffffffffff0fff) | 0x0000000000004000;
+  uuid.low  = (uuid.low  & 0x3fffffffffffffff) | 0x8000000000000000;
+
+  return uuid;
+}
+
+internal void uuid4_to_uuid(const UUID4* uuid4, UUID *uuid) {
+  u64 grp1 = uuid4->high >> 32;
+  u64 grp2 = (uuid4->high << 32) >> 48;
+  u64 grp3 = (uuid4->high << 48) >> 48;
+  u64 grp4 = uuid4->low >> 48;
+  u64 grp5 = (uuid4->low << 16) >> 16;
+
+  wapp_str8_format(&(uuid->uuid), UUID_STR_FORMAT, grp1, grp2, grp3, grp4, grp5);
+}

src/uuid/uuid.h

@@ -0,0 +1,34 @@
+#ifndef UUID_H
+#define UUID_H
+
+#include "../common/aliases/aliases.h"
+#include "../core/strings/str8/str8.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+#define UUID_BUF_LENGTH 48
+#define WAPP_UUID_SPEC WAPP_STR8_SPEC
+#define wapp_uuid_varg(UUID) wapp_str8_varg((UUID).uuid)
+
+typedef struct uuid UUID;
+struct uuid {
+  Str8 uuid;
+};
+
+#define wapp_uuid_gen_uuid4() *(wapp_uuid_init_uuid4(&wapp_uuid_create()))
+
+/* Low level UUID API */
+
+#define wapp_uuid_create() ((UUID){.uuid = wapp_str8_buf(UUID_BUF_LENGTH)})
+
+// Just returns the same pointer that was passed in with the UUID initialised.
+// If the pointer is NULL, it skips initialisation.
+UUID *wapp_uuid_init_uuid4(UUID *uuid);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !UUID_H

src/uuid/wapp_uuid.c

@@ -0,0 +1,8 @@
+#ifndef WAPP_UUID_C
+#define WAPP_UUID_C
+
+#include "uuid.c"
+#include "../core/wapp_core.c"
+#include "../prng/wapp_prng.c"
+
+#endif // !WAPP_UUID_C

src/uuid/wapp_uuid.h

@@ -0,0 +1,9 @@
+#ifndef WAPP_UUID_H
+#define WAPP_UUID_H
+
+#include "uuid.h"
+#include "../common/wapp_common.h"
+#include "../core/wapp_core.h"
+#include "../prng/wapp_prng.h"
+
+#endif // !WAPP_UUID_H

src/wapp.c

@@ -0,0 +1,11 @@
+#ifndef WAPP_C
+#define WAPP_C
+
+#include "wapp.h"
+#include "containers/wapp_containers.c"
+#include "core/wapp_core.c"
+#include "prng/wapp_prng.c"
+#include "uuid/uuid.c"
+#include "testing/wapp_testing.c"
+
+#endif // !WAPP_C

src/wapp.h

@@ -0,0 +1,11 @@
+#ifndef WAPP_H
+#define WAPP_H
+
+#include "common/wapp_common.h"
+#include "containers/wapp_containers.h"
+#include "core/wapp_core.h"
+#include "prng/wapp_prng.h"
+#include "uuid/wapp_uuid.h"
+#include "testing/wapp_testing.h"
+
+#endif // !WAPP_H

tests/allocator/test_allocator.c

@@ -0,0 +1,18 @@
+#include "test_allocator.h"
+#include "wapp.h"
+#include <stdbool.h>
+#include <stdlib.h>
+
+TestFuncResult test_arena_allocator(void) {
+  Allocator allocator = wapp_mem_arena_allocator_init(4096);
+  bool result         = allocator.obj != NULL && allocator.alloc != NULL &&
+                        allocator.alloc_aligned != NULL &&
+                        allocator.realloc != NULL && allocator.realloc_aligned != NULL &&
+                        allocator.free == NULL;
+  void *ptr           = wapp_mem_allocator_alloc(&allocator, 20);
+  result              = result && (ptr != NULL);
+
+  wapp_mem_arena_allocator_destroy(&allocator);
+
+  return wapp_tester_result(result);
+}

tests/allocator/test_allocator.h

@@ -0,0 +1,16 @@
+#ifndef TEST_ALLOCATOR_H
+#define TEST_ALLOCATOR_H
+
+#include "wapp.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+TestFuncResult test_arena_allocator(void);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !TEST_ALLOCATOR_H

tests/arena/test_arena.c

@@ -1,27 +1,24 @@
 #include "test_arena.h"
-#include "aliases.h"
-#include "mem_arena.h"
-#include "tester.h"
+#include "wapp.h"
 #include <stdbool.h>
 #include <stdlib.h>
 
-#define ARENA_CAPACITY 1024
+#define ARENA_CAPACITY KB(16)
 
 internal Arena *arena = NULL;
-internal i32 count = 20;
-internal i32 *array = NULL;
+internal i32 count    = 20;
+internal i32 *array   = NULL;
 
 TestFuncResult test_arena_init(void) {
-  bool result = wapp_mem_arena_init_default(&arena, ARENA_CAPACITY);
+  bool result = wapp_mem_arena_init(&arena, ARENA_CAPACITY);
 
   return wapp_tester_result(result);
 }
 
 TestFuncResult test_arena_init_succeeds_when_reserving_very_large_size(void) {
   Arena *large_arena = NULL;
-  u64 capacity = 512ull * 1024ull * 1024ull * 1024ull;
-  bool result = wapp_mem_arena_init(&large_arena, capacity,
-                                    WAPP_MEM_ALLOC_RESERVE, false);
+  u64 capacity       = GB(512);
+  bool result        = wapp_mem_arena_init(&large_arena, capacity);
   if (result) {
     wapp_mem_arena_destroy(&large_arena);
   }
@@ -30,7 +27,7 @@ TestFuncResult test_arena_init_succeeds_when_reserving_very_large_size(void) {
 }
 
 TestFuncResult test_arena_alloc_succeeds_when_within_capacity(void) {
-  array = wapp_mem_arena_alloc(arena, count * sizeof(i32));
+  array       = wapp_mem_arena_alloc(arena, count * sizeof(i32));
   bool result = array != NULL;
 
   for (i32 i = 0; i < count; ++i) {
@@ -41,12 +38,58 @@ TestFuncResult test_arena_alloc_succeeds_when_within_capacity(void) {
 }
 
 TestFuncResult test_arena_alloc_fails_when_over_capacity(void) {
-  u8 *bytes = wapp_mem_arena_alloc(arena, ARENA_CAPACITY * 2);
+  u8 *bytes   = wapp_mem_arena_alloc(arena, ARENA_CAPACITY * 2);
   bool result = bytes == NULL;
 
   return wapp_tester_result(result);
 }
 
+TestFuncResult test_arena_realloc_bigger_size(void) {
+  u64 old_count = 10;
+  u64 new_count = 20;
+  i32 *bytes    = wapp_mem_arena_alloc(arena, old_count * sizeof(i32));
+
+  for (u64 i = 0; i < old_count; ++i) {
+    bytes[i] = (i32)i;
+  }
+
+  i32 *new_bytes = wapp_mem_arena_realloc(arena, bytes, old_count * sizeof(i32), new_count * sizeof(i32));
+  if (!new_bytes) {
+    return wapp_tester_result(false);
+  }
+
+  for (u64 i = 0; i < new_count; ++i) {
+    if (i < old_count && new_bytes[i] != bytes[i]) {
+      return wapp_tester_result(false);
+    }
+  }
+
+  return wapp_tester_result(true);
+}
+
+TestFuncResult test_arena_realloc_smaller_size(void) {
+  u64 old_count = 10;
+  u64 new_count = 5;
+  i32 *bytes    = wapp_mem_arena_alloc(arena, old_count * sizeof(i32));
+
+  for (u64 i = 0; i < old_count; ++i) {
+    bytes[i] = (i32)i;
+  }
+
+  i32 *new_bytes = wapp_mem_arena_realloc(arena, bytes, old_count * sizeof(i32), new_count * sizeof(i32));
+  if (!new_bytes) {
+    return wapp_tester_result(false);
+  }
+
+  for (u64 i = 0; i < new_count; ++i) {
+    if (i < new_count && new_bytes[i] != bytes[i]) {
+      return wapp_tester_result(false);
+    }
+  }
+
+  return wapp_tester_result(true);
+}
+
 TestFuncResult test_arena_clear(void) {
   wapp_mem_arena_clear(arena);
   bool result = true;

tests/arena/test_arena.h

@@ -1,21 +1,23 @@
 #ifndef TEST_ARENA_H
 #define TEST_ARENA_H
 
-#include "tester.h"
+#include "wapp.h"
 
 #ifdef __cplusplus
-extern "C" {
+BEGIN_C_LINKAGE
 #endif // __cplusplus
 
 TestFuncResult test_arena_init(void);
 TestFuncResult test_arena_init_succeeds_when_reserving_very_large_size(void);
 TestFuncResult test_arena_alloc_succeeds_when_within_capacity(void);
 TestFuncResult test_arena_alloc_fails_when_over_capacity(void);
+TestFuncResult test_arena_realloc_bigger_size(void);
+TestFuncResult test_arena_realloc_smaller_size(void);
 TestFuncResult test_arena_clear(void);
 TestFuncResult test_arena_destroy(void);
 
 #ifdef __cplusplus
-}
+END_C_LINKAGE
 #endif // __cplusplus
 
 #endif // !TEST_ARENA_H

tests/cpath/test_cpath.c

@@ -0,0 +1,182 @@
+#include "test_cpath.h"
+#include "wapp.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+#define MAIN_BUF_SIZE 4096
+#define TMP_BUF_SIZE  1024
+
+TestFuncResult test_cpath_join_path(void) {
+  bool result;
+
+  Str8 expected = wapp_str8_buf(MAIN_BUF_SIZE);
+  Str8 out      = wapp_str8_buf(MAIN_BUF_SIZE);
+  Str8 tmp      = wapp_str8_buf(TMP_BUF_SIZE);
+
+  wapp_str8_format(&expected, "%chome%cabdelrahman%cDocuments", PATH_SEP, PATH_SEP, PATH_SEP);
+  wapp_str8_format(&tmp, "%c", PATH_SEP);
+
+  DBL_LIST(Str8) parts = {0};
+  wapp_dbl_list_push_back(&parts, &wapp_str8_node_from_str8(tmp));
+  wapp_dbl_list_push_back(&parts, &wapp_str8_node_from_cstr("home"));
+  wapp_dbl_list_push_back(&parts, &wapp_str8_node_from_cstr("abdelrahman"));
+  wapp_dbl_list_push_back(&parts, &wapp_str8_node_from_cstr("Documents"));
+
+  wapp_cpath_join_path(&out, &parts);
+  result = wapp_str8_equal(&out, &expected);
+
+  wapp_dbl_list_pop_front(Str8, &parts);
+
+  wapp_str8_format(&expected, "home%cabdelrahman%cDocuments", PATH_SEP, PATH_SEP);
+
+  wapp_cpath_join_path(&out, &parts);
+  result = result && wapp_str8_equal(&out, &expected);
+
+  wapp_str8_concat_capped(&tmp, &wapp_str8_lit_ro("home"));
+  wapp_dbl_list_pop_front(Str8, &parts);
+  wapp_dbl_list_push_front(&parts, &wapp_str8_node_from_str8(tmp));
+
+  wapp_str8_format(&expected, "%chome%cabdelrahman%cDocuments", PATH_SEP, PATH_SEP, PATH_SEP);
+
+  wapp_cpath_join_path(&out, &parts);
+  result = result && wapp_str8_equal(&out, &expected);
+
+  wapp_str8_format(&tmp, "home%c", PATH_SEP);
+  wapp_dbl_list_pop_front(Str8, &parts);
+  wapp_dbl_list_push_front(&parts, &wapp_str8_node_from_cstr("home"));
+
+  wapp_str8_format(&expected, "home%cabdelrahman%cDocuments", PATH_SEP, PATH_SEP);
+
+  wapp_cpath_join_path(&out, &parts);
+  result = result && wapp_str8_equal(&out, &expected);
+
+  wapp_dbl_list_empty(&parts);
+
+  wapp_str8_format(&tmp, "%chome", PATH_SEP);
+  wapp_dbl_list_push_back(&parts, &wapp_str8_node_from_str8(tmp));
+  wapp_dbl_list_push_back(&parts, &wapp_str8_node_from_cstr(""));
+
+  wapp_str8_format(&expected, "%chome", PATH_SEP);
+
+  wapp_cpath_join_path(&out, &parts);
+  result = result && wapp_str8_equal(&out, &expected);
+
+  wapp_dbl_list_pop_front(Str8, &parts);
+  wapp_dbl_list_push_back(&parts, &wapp_str8_node_from_cstr(""));
+
+  wapp_str8_format(&expected, "%s", "");
+
+  wapp_cpath_join_path(&out, &parts);
+  result = result && wapp_str8_equal(&out, &expected);
+
+  wapp_dbl_list_pop_back(Str8, &parts);
+  wapp_dbl_list_push_back(&parts, &wapp_str8_node_from_cstr("home"));
+
+  wapp_str8_copy_cstr_capped(&expected, "home");
+
+  wapp_cpath_join_path(&out, &parts);
+  result = result && wapp_str8_equal(&out, &expected);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_cpath_dirname(void) {
+  Allocator arena = wapp_mem_arena_allocator_init(MB(8));
+  if (wapp_mem_allocator_invalid(&arena)) {
+    return wapp_tester_result(false);
+  }
+
+  bool result;
+  Str8 *output = NULL;
+
+  Str8 expected = wapp_str8_buf(MAIN_BUF_SIZE);
+  Str8 tmp      = wapp_str8_buf(TMP_BUF_SIZE);
+
+  // CASE 1
+  wapp_str8_format(&tmp, "%c", PATH_SEP);
+  wapp_str8_format(&expected, "%c", PATH_SEP);
+
+  output = wapp_cpath_dirname(&arena, &tmp);
+  result = output != NULL && wapp_str8_equal(output, &expected);
+
+  // CASE 2
+  wapp_str8_format(&expected, "%s", ".");
+
+  output = wapp_cpath_dirname(&arena, &wapp_str8_lit("home"));
+  result = result && output != NULL && wapp_str8_equal(output, &expected);
+
+  // CASE 3
+  output = wapp_cpath_dirname(&arena, &wapp_str8_lit(""));
+  result = result && output != NULL && wapp_str8_equal(output, &expected);
+
+  // CASE 4
+  wapp_str8_format(&tmp, "%chome%ctest", PATH_SEP, PATH_SEP);
+  wapp_str8_format(&expected, "%chome", PATH_SEP);
+
+  output = wapp_cpath_dirname(&arena, &tmp);
+  result = result && output != NULL && wapp_str8_equal(output, &expected);
+
+  // CASE 5
+  wapp_str8_format(&tmp, "%chome%ctest%c", PATH_SEP, PATH_SEP, PATH_SEP);
+  wapp_str8_format(&expected, "%chome", PATH_SEP);
+
+  output = wapp_cpath_dirname(&arena, &tmp);
+  result = result && output != NULL && wapp_str8_equal(output, &expected);
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_cpath_dirup(void) {
+  Allocator arena = wapp_mem_arena_allocator_init(MB(8));
+  if (wapp_mem_allocator_invalid(&arena)) {
+    return wapp_tester_result(false);
+  }
+
+  bool result;
+  Str8 *output = NULL;
+
+  Str8 expected = wapp_str8_buf(MAIN_BUF_SIZE);
+  Str8 tmp      = wapp_str8_buf(TMP_BUF_SIZE);
+
+  // CASE 1
+  wapp_str8_format(&tmp, "%c", PATH_SEP);
+  wapp_str8_format(&expected, "%c", PATH_SEP);
+
+  output = wapp_cpath_dirup(&arena, &tmp, 3);
+  result = output != NULL && wapp_str8_equal(output, &expected);
+
+  // CASE 2
+  wapp_str8_format(&tmp, "%chome%cabdelrahman%cDocuments", PATH_SEP, PATH_SEP, PATH_SEP);
+  wapp_str8_format(&expected, "%c", PATH_SEP);
+
+  output = wapp_cpath_dirup(&arena, &tmp, 3);
+  result = result && output != NULL && wapp_str8_equal(output, &expected);
+
+  // CASE 3
+  wapp_str8_format(&tmp, "home%cabdelrahman%cDocuments", PATH_SEP, PATH_SEP);
+  wapp_str8_copy_cstr_capped(&expected, ".");
+
+  output = wapp_cpath_dirup(&arena, &tmp, 3);
+  result = result && output != NULL && wapp_str8_equal(output, &expected);
+
+  // CASE 4
+  wapp_str8_format(&tmp, "%chome%cabdelrahman%cDocuments", PATH_SEP, PATH_SEP, PATH_SEP);
+  wapp_str8_format(&expected, "%chome", PATH_SEP);
+
+  output = wapp_cpath_dirup(&arena, &tmp, 2);
+  result = result && output != NULL && wapp_str8_equal(output, &expected);
+
+  // CASE 5
+  wapp_str8_format(&tmp, "home%cabdelrahman%cDocuments", PATH_SEP, PATH_SEP);
+  wapp_str8_copy_cstr_capped(&expected, "home");
+
+  output = wapp_cpath_dirup(&arena, &tmp, 2);
+  result = result && output != NULL && wapp_str8_equal(output, &expected);
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return wapp_tester_result(result);
+}

tests/cpath/test_cpath.h

@@ -0,0 +1,18 @@
+#ifndef TEST_CPATH_H
+#define TEST_CPATH_H
+
+#include "wapp.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+TestFuncResult test_cpath_join_path(void);
+TestFuncResult test_cpath_dirname(void);
+TestFuncResult test_cpath_dirup(void);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !TEST_CPATH_H

tests/shell_commander/test_shell_commander.c

@@ -0,0 +1,63 @@
+#include "test_shell_commander.h"
+#include "wapp.h"
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+TestFuncResult test_commander_cmd_success(void) {
+  DBL_LIST(Str8) cmd = {0};
+  wapp_dbl_list_push_back(&cmd, &wapp_str8_node_from_cstr("echo"));
+  wapp_dbl_list_push_back(&cmd, &wapp_str8_node_from_cstr("hello world"));
+
+  CMDResult result = wapp_shell_commander_execute(SHELL_OUTPUT_DISCARD, NULL, &cmd);
+  bool succeeded   = result.exited && result.exit_code == EXIT_SUCCESS &&
+                     result.error == SHELL_ERR_NO_ERROR;
+
+  return wapp_tester_result(succeeded);
+}
+
+TestFuncResult test_commander_cmd_failure(void) {
+  DBL_LIST(Str8) cmd = {0};
+  wapp_dbl_list_push_back(&cmd, &wapp_str8_node_from_cstr("grep"));
+
+  CMDResult result = wapp_shell_commander_execute(SHELL_OUTPUT_DISCARD, NULL, &cmd);
+  bool failed      = result.exited && result.exit_code != EXIT_SUCCESS &&
+                     result.error == SHELL_ERR_NO_ERROR;
+
+  return wapp_tester_result(failed);
+}
+
+TestFuncResult test_commander_cmd_out_buf_success(void) {
+  Str8 buf          = wapp_str8_buf(64);
+  Str8 expected     = wapp_str8_buf(64);
+  char msg[]        = "hello world";
+  wapp_str8_copy_cstr_capped(&expected, msg);
+
+  DBL_LIST(Str8) cmd = {0};
+  wapp_dbl_list_push_back(&cmd, &wapp_str8_node_from_cstr("echo"));
+  wapp_dbl_list_push_back(&cmd, &wapp_str8_node_from_cstr(msg));
+
+  CMDResult result = wapp_shell_commander_execute(SHELL_OUTPUT_CAPTURE, &buf, &cmd);
+  bool succeeded   = result.exited && result.exit_code == EXIT_SUCCESS &&
+                     result.error == SHELL_ERR_NO_ERROR && wapp_str8_equal_to_count(&buf, &expected, strlen(msg));
+
+  return wapp_tester_result(succeeded);
+}
+
+TestFuncResult test_commander_cmd_out_buf_failure(void) {
+  Str8 buf         = wapp_str8_buf(4);
+  Str8 expected    = wapp_str8_buf(64);
+  char msg[]       = "hello world";
+  wapp_str8_copy_cstr_capped(&expected, msg);
+
+  DBL_LIST(Str8) cmd = {0};
+  wapp_dbl_list_push_back(&cmd, &wapp_str8_node_from_cstr("echo"));
+  wapp_dbl_list_push_back(&cmd, &wapp_str8_node_from_cstr(msg));
+
+  CMDResult result = wapp_shell_commander_execute(SHELL_OUTPUT_CAPTURE, &buf, &cmd);
+  bool failed      = !result.exited && result.exit_code != EXIT_SUCCESS &&
+                     result.error == SHELL_ERR_OUT_BUF_FULL && !wapp_str8_equal(&buf, &expected);
+
+  return wapp_tester_result(failed);
+}

tests/shell_commander/test_shell_commander.h

@@ -0,0 +1,19 @@
+#ifndef TEST_SHELL_COMMANDER_H
+#define TEST_SHELL_COMMANDER_H
+
+#include "wapp.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+TestFuncResult test_commander_cmd_success(void);
+TestFuncResult test_commander_cmd_failure(void);
+TestFuncResult test_commander_cmd_out_buf_success(void);
+TestFuncResult test_commander_cmd_out_buf_failure(void);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !TEST_SHELL_COMMANDER_H

tests/str8/test_str8.c

@@ -0,0 +1,614 @@
+#include "test_str8.h"
+#include "wapp.h"
+#include <stdbool.h>
+
+#define ARRLEN(ARR) (sizeof(ARR) / sizeof(ARR[0]))
+
+TestFuncResult test_str8_lit(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("Hello world");
+  result  = s1.capacity == 22 && s1.capacity != s1.size;
+
+  Str8 s2 = wapp_str8_lit("Different strokes for different folks");
+  result  = result && s2.capacity == 74 && s2.capacity != s2.size;
+
+  Str8 s3 = wapp_str8_lit("Discretion is the better part of valour");
+  result  = result && s3.capacity == 78 && s3.capacity != s3.size;
+
+  Str8 s4 = wapp_str8_lit("Distance lends enchantment to the view");
+  result  = result && s4.capacity == 76 && s4.capacity != s4.size;
+
+  Str8 s5 = wapp_str8_lit("Do as I say, not as I do");
+  result  = result && s5.capacity == 48 && s5.capacity != s5.size;
+
+  Str8 s6 = wapp_str8_lit("Do as you would be done by");
+  result  = result && s6.capacity == 52 && s6.capacity != s6.size;
+
+  Str8 s7 = wapp_str8_lit("Do unto others as you would have them do to you");
+  result  = result && s7.capacity == 94 && s7.capacity != s7.size;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_lit_ro(void) {
+  bool result;
+
+  Str8RO s1 = wapp_str8_lit_ro("Hello world");
+  result    = s1.capacity == 11 && s1.capacity == s1.size;
+
+  Str8RO s2 = wapp_str8_lit_ro("Different strokes for different folks");
+  result    = result && s2.capacity == 37 && s2.capacity == s2.size;
+
+  Str8RO s3 = wapp_str8_lit_ro("Discretion is the better part of valour");
+  result    = result && s3.capacity == 39 && s3.capacity == s3.size;
+
+  Str8RO s4 = wapp_str8_lit_ro("Distance lends enchantment to the view");
+  result    = result && s4.capacity == 38 && s4.capacity == s4.size;
+
+  Str8RO s5 = wapp_str8_lit_ro("Do as I say, not as I do");
+  result    = result && s5.capacity == 24 && s5.capacity == s5.size;
+
+  Str8RO s6 = wapp_str8_lit_ro("Do as you would be done by");
+  result    = result && s6.capacity == 26 && s6.capacity == s6.size;
+
+  Str8RO s7 = wapp_str8_lit_ro("Do unto others as you would have them do to you");
+  result    = result && s7.capacity == 47 && s7.capacity == s7.size;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_buf(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_buf(1024);
+  result  = s1.capacity == 1024 && s1.size == 0;
+
+  Str8 s2 = wapp_str8_buf(2048);
+  result  = result && s2.capacity == 2048 && s2.size == 0;
+
+  Str8 s3 = wapp_str8_buf(4096);
+  result  = result && s3.capacity == 4096 && s3.size == 0;
+
+  Str8 s4 = wapp_str8_buf(8192);
+  result  = result && s4.capacity == 8192 && s4.size == 0;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_alloc_buf(void) {
+  bool result;
+  Allocator allocator = wapp_mem_arena_allocator_init(KB(100));
+  if (wapp_mem_allocator_invalid(&allocator)) {
+    return wapp_tester_result(false);
+  }
+
+  u64 capacity = 4096;
+
+  Str8 *s = wapp_str8_alloc_buf(&allocator, capacity);
+  if (!s) {
+    result = false;
+    goto TEST_ALLOC_BUF_CLEANUP;
+  }
+
+  result  = s->capacity == capacity;
+
+  const char *cstr = "My name is Abdelrahman";
+  wapp_str8_copy_cstr_capped(s, cstr);
+
+  result = result && s->capacity == capacity && s->size == strlen(cstr) && memcmp(s->buf, cstr, s->size) == 0;
+
+TEST_ALLOC_BUF_CLEANUP:
+  wapp_mem_arena_allocator_destroy(&allocator);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_alloc_cstr(void) {
+  bool result;
+  Allocator allocator = wapp_mem_arena_allocator_init(KB(100));
+  if (wapp_mem_allocator_invalid(&allocator)) {
+    return wapp_tester_result(false);
+  }
+
+  char *str  = "Abdelrahman";
+  u64 length = strlen(str);
+  Str8 *s    = wapp_str8_alloc_cstr(&allocator, str);
+  if (!s) {
+    return wapp_tester_result(false);
+  }
+
+  result = s->size == length && memcmp(s->buf, str, length) == 0;
+
+  wapp_mem_arena_allocator_destroy(&allocator);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_alloc_str8(void) {
+  bool result;
+  Allocator allocator = wapp_mem_arena_allocator_init(KB(100));
+  if (wapp_mem_allocator_invalid(&allocator)) {
+    return wapp_tester_result(false);
+  }
+
+  Str8 str = wapp_str8_lit("Abdelrahman");
+  Str8 *s  = wapp_str8_alloc_str8(&allocator, &str);
+  if (!s) {
+    return wapp_tester_result(false);
+  }
+
+  result = wapp_str8_equal(s, &str);
+
+  wapp_mem_arena_allocator_destroy(&allocator);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_alloc_substr(void) {
+  bool result;
+  Allocator allocator = wapp_mem_arena_allocator_init(KB(100));
+  if (wapp_mem_allocator_invalid(&allocator)) {
+    return wapp_tester_result(false);
+  }
+
+  Str8 str = wapp_str8_lit("Abdelrahman");
+  Str8 *s  = wapp_str8_alloc_substr(&allocator, &str, 3, 8);
+  if (!s) {
+    return wapp_tester_result(false);
+  }
+
+  result = s->size == 5 && memcmp(s->buf, "elrah", s->size) == 0;
+
+  wapp_mem_arena_allocator_destroy(&allocator);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_get_index_within_bounds(void) {
+  bool result;
+
+  Str8RO s1 = wapp_str8_lit_ro("Hello world");
+  result    = wapp_str8_get(&s1, 4) == 'o';
+
+  Str8RO s2 = wapp_str8_lit_ro("Different strokes for different folks");
+  result    = result && wapp_str8_get(&s2, 0) == 'D';
+
+  Str8RO s3 = wapp_str8_lit_ro("Discretion is the better part of valour");
+  result    = result && wapp_str8_get(&s3, 13) == ' ';
+
+  Str8RO s4 = wapp_str8_lit_ro("Distance lends enchantment to the view");
+  result    = result && wapp_str8_get(&s4, 20) == 'n';
+
+  Str8RO s5 = wapp_str8_lit_ro("Do as I say, not as I do");
+  result    = result && wapp_str8_get(&s5, 11) == ',';
+
+  Str8RO s6 = wapp_str8_lit_ro("Do as you would be done by");
+  result    = result && wapp_str8_get(&s6, 25) == 'y';
+
+  Str8RO s7 = wapp_str8_lit_ro("Do unto others as you would have them do to you");
+  result    = result && wapp_str8_get(&s7, 16) == 's';
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_get_index_out_of_bounds(void) {
+  Str8 s1      = wapp_str8_lit("Hello world");
+  bool result  = wapp_str8_get(&s1, 20) == '\0';
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_set(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("Hello world");
+  wapp_str8_set(&s1, 4, 'f');
+  result  = wapp_str8_get(&s1, 4) == 'f';
+
+  Str8 s2 = wapp_str8_lit("Different strokes for different folks");
+  wapp_str8_set(&s2, 0, 'A');
+  result  = result && wapp_str8_get(&s2, 0) == 'A';
+
+  Str8 s3 = wapp_str8_lit("Discretion is the better part of valour");
+  wapp_str8_set(&s3, 13, 'u');
+  result  = result && wapp_str8_get(&s3, 13) == 'u';
+
+  Str8 s4 = wapp_str8_lit("Distance lends enchantment to the view");
+  wapp_str8_set(&s4, 20, 'R');
+  result  = result && wapp_str8_get(&s4, 20) == 'R';
+
+  Str8 s5 = wapp_str8_lit("Do as I say, not as I do");
+  wapp_str8_set(&s5, 11, '.');
+  result  = result && wapp_str8_get(&s5, 11) == '.';
+
+  Str8 s6 = wapp_str8_lit("Do as you would be done by");
+  wapp_str8_set(&s6, 25, 'w');
+  result  = result && wapp_str8_get(&s6, 25) == 'w';
+
+  Str8 s7 = wapp_str8_lit("Do unto others as you would have them do to you");
+  wapp_str8_set(&s7, 16, 'i');
+  result  = result && wapp_str8_get(&s7, 16) == 'i';
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_push_back(void) {
+  bool result;
+
+  Str8 expected = wapp_str8_lit("Abdelrahman");
+  Str8 buf      = wapp_str8_buf(64);
+  wapp_str8_push_back(&buf, 'A');
+  wapp_str8_push_back(&buf, 'b');
+  wapp_str8_push_back(&buf, 'd');
+  wapp_str8_push_back(&buf, 'e');
+  wapp_str8_push_back(&buf, 'l');
+  wapp_str8_push_back(&buf, 'r');
+  wapp_str8_push_back(&buf, 'a');
+  wapp_str8_push_back(&buf, 'h');
+  wapp_str8_push_back(&buf, 'm');
+  wapp_str8_push_back(&buf, 'a');
+  wapp_str8_push_back(&buf, 'n');
+
+  result = wapp_str8_equal(&buf, &expected);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_equal(void) {
+  bool result;
+
+  Str8RO s1 = wapp_str8_lit_ro("hello");
+  Str8RO s2 = wapp_str8_lit_ro("hell");
+  Str8RO s3 = wapp_str8_lit_ro("hello");
+  Str8RO s4 = wapp_str8_lit_ro("goodbye");
+
+  result = wapp_str8_equal(&s1, &s2) == false;
+  result = result && wapp_str8_equal(&s1, &s3) == true;
+  result = result && wapp_str8_equal(&s1, &s4) == false;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_slice(void) {
+  bool result;
+  Str8 s = wapp_str8_lit("Different strokes for different folks");
+
+  Str8RO sub1 = wapp_str8_slice(&s, 3, 9);
+  result = sub1.size == 6 && sub1.capacity == 6;
+
+  Str8RO sub2 = wapp_str8_slice(&s, 18, 21);
+  result = result && sub2.size == 3 && sub2.capacity == 3;
+
+  Str8RO sub3 = wapp_str8_slice(&s, 5, 1);
+  result = result && sub3.size == 0 && sub3.capacity == 0;
+
+  Str8RO sub4 = wapp_str8_slice(&s, 70, 80);
+  result = result && sub4.size == 0 && sub4.capacity == 0;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_alloc_concat(void) {
+  bool result;
+  Allocator arena = wapp_mem_arena_allocator_init(KB(100));
+
+  Str8 str     = wapp_str8_lit("Hello world");
+  Str8 suffix1 = wapp_str8_lit(" from me.");
+  Str8 suffix2 = wapp_str8_lit(" This is my code.");
+  Str8 concat1 = wapp_str8_lit("Hello world from me.");
+  Str8 concat2 = wapp_str8_lit("Hello world from me. This is my code.");
+
+  Str8 *output;
+
+  output = wapp_str8_alloc_concat(&arena, &str, &suffix1);
+  result = output->size == concat1.size && wapp_str8_equal(output, &concat1);
+
+  output = wapp_str8_alloc_concat(&arena, output, &suffix2);
+  result = result && output->size == concat2.size && wapp_str8_equal(output, &concat2);
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_concat_capped(void) {
+  bool result;
+
+  Str8 str     = wapp_str8_lit("Hello world");
+  Str8 suffix1 = wapp_str8_lit(" from me.");
+  Str8 suffix2 = wapp_str8_lit(" This is my code.");
+  Str8 concat1 = wapp_str8_lit("Hello world from me.");
+  Str8 concat2 = wapp_str8_lit("Hello world from me. T");
+
+  wapp_str8_concat_capped(&str, &suffix1);
+  result = str.size == concat1.size && wapp_str8_equal(&str, &concat1);
+
+  wapp_str8_concat_capped(&str, &suffix2);
+  result = result && str.size == concat2.size && wapp_str8_equal(&str, &concat2);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_copy_cstr_capped(void) {
+  bool result;
+
+  Str8 buf         = wapp_str8_buf(32);
+  const char *src1 = "Hello world";
+  const char *src2 = "Hello world from the Wizard Apprentice standard library";
+  Str8RO src1_cp   = wapp_str8_lit_ro("Hello world");
+  Str8RO src2_cp   = wapp_str8_lit_ro("Hello world from the Wizard Appr");
+
+  wapp_str8_copy_cstr_capped(&buf, src1);
+  result = buf.size == src1_cp.size && wapp_str8_equal(&buf, &src1_cp);
+
+  wapp_str8_copy_cstr_capped(&buf, src2);
+  result = result && buf.size == src2_cp.size && buf.size == buf.capacity && wapp_str8_equal(&buf, &src2_cp);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_copy_str8_capped(void) {
+  bool result;
+
+  Str8 buf       = wapp_str8_buf(32);
+  Str8RO src1    = wapp_str8_lit_ro("Hello world");
+  Str8RO src2    = wapp_str8_lit_ro("Hello world from the Wizard Apprentice standard library");
+  Str8RO src2_cp = wapp_str8_lit_ro("Hello world from the Wizard Appr");
+
+  wapp_str8_copy_str8_capped(&buf, &src1);
+  result = buf.size == src1.size && wapp_str8_equal(&buf, &src1);
+
+  wapp_str8_copy_str8_capped(&buf, &src2);
+  result = result && buf.size < src2.size && buf.size == buf.capacity && wapp_str8_equal(&buf, &src2_cp);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_format(void) {
+  bool result;
+
+  Str8 buf      = wapp_str8_buf(128);
+  Str8 expected = wapp_str8_lit("My name is Abdelrahman and I am 35 years old");
+
+  wapp_str8_format(&buf, "My name is %s and I am %u years old", "Abdelrahman", 35);
+
+  result = wapp_str8_equal(&buf, &expected);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_find(void) {
+  bool result;
+  Str8RO s = wapp_str8_lit("Do as I say, not as I do");
+
+  result = wapp_str8_find(&s, wapp_str8_lit_ro("d")) != -1;
+  result = result && (wapp_str8_find(&s, wapp_str8_lit_ro("not")) != -1);
+  result = result && (wapp_str8_find(&s, wapp_str8_lit_ro("as I say")) != -1);
+
+  result = result && (wapp_str8_find(&s, wapp_str8_lit_ro("f")) == -1);
+  result = result && (wapp_str8_find(&s, wapp_str8_lit_ro("hello")) == -1);
+  result = result && (wapp_str8_find(&s, wapp_str8_lit_ro("not sa I")) == -1);
+  result = result && (wapp_str8_find(&s, wapp_str8_lit_ro("Do unto others as you would have them do to you")) == -1);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_rfind(void) {
+  bool result;
+  Str8RO s = wapp_str8_lit("Do as I say, not as I do");
+
+  result = wapp_str8_rfind(&s, wapp_str8_lit_ro("d")) != -1;
+  result = result && (wapp_str8_rfind(&s, wapp_str8_lit_ro("not")) != -1);
+  result = result && (wapp_str8_rfind(&s, wapp_str8_lit_ro("as I say")) != -1);
+
+  result = result && (wapp_str8_rfind(&s, wapp_str8_lit_ro("f")) == -1);
+  result = result && (wapp_str8_rfind(&s, wapp_str8_lit_ro("hello")) == -1);
+  result = result && (wapp_str8_rfind(&s, wapp_str8_lit_ro("not sa I")) == -1);
+  result = result && (wapp_str8_rfind(&s, wapp_str8_lit_ro("Do unto others as you would have them do to you")) == -1);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_split(void) {
+  bool result;
+  Allocator arena = wapp_mem_arena_allocator_init(KB(100));
+
+  Str8 str        = wapp_str8_lit("hello world from me");
+  Str8 delim1     = wapp_str8_lit(" ");
+  Str8 delim2     = wapp_str8_lit("from");
+  DBL_LIST(Str8) *list1 = wapp_str8_split(&arena, &str, &delim1);
+  DBL_LIST(Str8) *list2 = wapp_str8_split(&arena, &str, &delim2);
+
+  Str8RO splits1[] = {
+    wapp_str8_slice(&str, 0, 5),
+    wapp_str8_slice(&str, 6, 11),
+    wapp_str8_slice(&str, 12, 16),
+    wapp_str8_slice(&str, 17, 19),
+  };
+  Str8RO splits2[] = {
+    wapp_str8_slice(&str, 0, 12),
+    wapp_str8_slice(&str, 16, 19),
+  };
+
+  u64 index1    = 0;
+  u64 count1    = ARRLEN(splits1);
+  bool running1 = true;
+
+  u64 index2    = 0;
+  u64 count2    = ARRLEN(splits2);
+  bool running2 = true;
+
+  result = list1->node_count == count1 && wapp_str8_list_total_size(list1) == str.size - 3;
+  result = result && list2->node_count == count2 && wapp_str8_list_total_size(list2) == str.size - 4;
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  while (running1) {
+    DBL_NODE(Str8) *node = wapp_dbl_list_get(Str8, list1, index1);
+    result = result && wapp_str8_equal(node->item, &(splits1[index1]));
+
+    ++index1;
+    running1 = index1 < count1;
+  }
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  while (running2) {
+    DBL_NODE(Str8) *node = wapp_dbl_list_get(Str8, list2, index2);
+    result = result && wapp_str8_equal(node->item, &(splits2[index2]));
+
+    ++index2;
+    running2 = index2 < count2;
+  }
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_split_with_max(void) {
+  bool result;
+  Allocator arena = wapp_mem_arena_allocator_init(KB(100));
+
+  Str8 str       = wapp_str8_lit("hello world from me");
+  Str8 delim     = wapp_str8_lit(" ");
+  DBL_LIST(Str8) *list = wapp_str8_split_with_max(&arena, &str, &delim, 2);
+
+  Str8RO splits[] = {
+    wapp_str8_slice(&str, 0, 5),
+    wapp_str8_slice(&str, 6, 11),
+    wapp_str8_slice(&str, 12, 19),
+  };
+
+  u64 index    = 0;
+  u64 count    = ARRLEN(splits);
+  bool running = true;
+
+  result = list->node_count == count && wapp_str8_list_total_size(list) == str.size - 2;
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  while (running) {
+    DBL_NODE(Str8) *node = wapp_dbl_list_get(Str8, list, index);
+    result = result && wapp_str8_equal(node->item, &(splits[index]));
+
+    ++index;
+    running = index < count;
+  }
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_rsplit(void) {
+  bool result;
+  Allocator arena = wapp_mem_arena_allocator_init(KB(100));
+
+  Str8 str        = wapp_str8_lit("hello world from me");
+  Str8 delim1     = wapp_str8_lit(" ");
+  Str8 delim2     = wapp_str8_lit("from");
+  DBL_LIST(Str8) *list1 = wapp_str8_rsplit(&arena, &str, &delim1);
+  DBL_LIST(Str8) *list2 = wapp_str8_rsplit(&arena, &str, &delim2);
+
+  Str8RO splits1[] = {
+    wapp_str8_slice(&str, 0, 5),
+    wapp_str8_slice(&str, 6, 11),
+    wapp_str8_slice(&str, 12, 16),
+    wapp_str8_slice(&str, 17, 19),
+  };
+  Str8RO splits2[] = {
+    wapp_str8_slice(&str, 0, 12),
+    wapp_str8_slice(&str, 16, 19),
+  };
+
+  u64 index1    = 0;
+  u64 count1    = ARRLEN(splits1);
+  bool running1 = true;
+
+  u64 index2    = 0;
+  u64 count2    = ARRLEN(splits2);
+  bool running2 = true;
+
+  result = list1->node_count == count1 && wapp_str8_list_total_size(list1) == str.size - 3;
+  result = result && list2->node_count == count2 && wapp_str8_list_total_size(list2) == str.size - 4;
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  while (running1) {
+    DBL_NODE(Str8) *node = wapp_dbl_list_get(Str8, list1, index1);
+    result = result && wapp_str8_equal(node->item, &(splits1[index1]));
+
+    ++index1;
+    running1 = index1 < count1;
+  }
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  while (running2) {
+    DBL_NODE(Str8) *node = wapp_dbl_list_get(Str8, list2, index2);
+    result = result && wapp_str8_equal(node->item, &(splits2[index2]));
+
+    ++index2;
+    running2 = index2 < count2;
+  }
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_rsplit_with_max(void) {
+  bool result;
+  Allocator arena = wapp_mem_arena_allocator_init(KB(100));
+
+  Str8 str       = wapp_str8_lit("hello world from me");
+  Str8 delim     = wapp_str8_lit(" ");
+  DBL_LIST(Str8) *list = wapp_str8_rsplit_with_max(&arena, &str, &delim, 2);
+
+  Str8RO splits[] = {
+    wapp_str8_slice(&str, 0, 11),
+    wapp_str8_slice(&str, 12, 16),
+    wapp_str8_slice(&str, 17, 19),
+  };
+
+  u64 index    = 0;
+  u64 count    = ARRLEN(splits);
+  bool running = true;
+
+  result = list->node_count == count && wapp_str8_list_total_size(list) == str.size - 2;
+
+  // NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
+  // MSVC Spectre mitigation warnings
+  while (running) {
+    DBL_NODE(Str8) *node = wapp_dbl_list_get(Str8, list, index);
+    result = result && wapp_str8_equal(node->item, &(splits[index]));
+
+    ++index;
+    running = index < count;
+  }
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_join(void) {
+  bool result;
+  Allocator arena = wapp_mem_arena_allocator_init(KB(100));
+
+  Str8 str        = wapp_str8_lit("hello world from me");
+  Str8 delim1     = wapp_str8_lit(" ");
+  Str8 delim2     = wapp_str8_lit("from");
+  DBL_LIST(Str8) *list1 = wapp_str8_rsplit(&arena, &str, &delim1);
+  DBL_LIST(Str8) *list2 = wapp_str8_rsplit(&arena, &str, &delim2);
+  Str8 *join1     = wapp_str8_join(&arena, list1, &delim1);
+  Str8 *join2     = wapp_str8_join(&arena, list2, &delim2);
+
+  result = join1->size == str.size && wapp_str8_equal(join1, &str);
+  result = result && join2->size == str.size && wapp_str8_equal(join2, &str);
+
+  wapp_mem_arena_allocator_destroy(&arena);
+
+  return wapp_tester_result(result);
+}

tests/str8/test_str8.h

@@ -0,0 +1,40 @@
+#ifndef TEST_STR8_H
+#define TEST_STR8_H
+
+#include "wapp.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+TestFuncResult test_str8_lit(void);
+TestFuncResult test_str8_lit_ro(void);
+TestFuncResult test_str8_buf(void);
+TestFuncResult test_str8_alloc_buf(void);
+TestFuncResult test_str8_alloc_cstr(void);
+TestFuncResult test_str8_alloc_str8(void);
+TestFuncResult test_str8_alloc_substr(void);
+TestFuncResult test_str8_alloc_concat(void);
+TestFuncResult test_str8_get_index_within_bounds(void);
+TestFuncResult test_str8_get_index_out_of_bounds(void);
+TestFuncResult test_str8_set(void);
+TestFuncResult test_str8_push_back(void);
+TestFuncResult test_str8_equal(void);
+TestFuncResult test_str8_slice(void);
+TestFuncResult test_str8_concat_capped(void);
+TestFuncResult test_str8_copy_cstr_capped(void);
+TestFuncResult test_str8_copy_str8_capped(void);
+TestFuncResult test_str8_format(void);
+TestFuncResult test_str8_find(void);
+TestFuncResult test_str8_rfind(void);
+TestFuncResult test_str8_split(void);
+TestFuncResult test_str8_split_with_max(void);
+TestFuncResult test_str8_rsplit(void);
+TestFuncResult test_str8_rsplit_with_max(void);
+TestFuncResult test_str8_join(void);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !TEST_STR8_H

tests/str8/test_str8_list.c

@@ -0,0 +1,263 @@
+#include "test_str8_list.h"
+#include "wapp.h"
+
+TestFuncResult test_str8_list_get(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("1");
+  Str8 s2 = wapp_str8_lit("2");
+  Str8 s3 = wapp_str8_lit("3");
+  Str8 s4 = wapp_str8_lit("4");
+  Str8 s5 = wapp_str8_lit("5");
+
+  DBL_LIST(Str8) list = {0};
+  DBL_NODE(Str8) n1   = { .item = &s1 };
+  DBL_NODE(Str8) n2   = { .item = &s2 };
+  DBL_NODE(Str8) n3   = { .item = &s3 };
+  DBL_NODE(Str8) n4   = { .item = &s4 };
+  DBL_NODE(Str8) n5   = { .item = &s5 };
+
+  wapp_dbl_list_push_back(&list, &n1);
+  wapp_dbl_list_push_back(&list, &n2);
+  wapp_dbl_list_push_back(&list, &n3);
+  wapp_dbl_list_push_back(&list, &n4);
+  wapp_dbl_list_push_back(&list, &n5);
+
+  DBL_NODE(Str8) *node = wapp_dbl_list_get(Str8, &list, 0);
+  result = node->item == &s1 && wapp_str8_equal(node->item, &s1);
+
+  node = wapp_dbl_list_get(Str8, &list, 1);
+  result = result && node->item == &s2 && wapp_str8_equal(node->item, &s2);
+
+  node = wapp_dbl_list_get(Str8, &list, 2);
+  result = result && node->item == &s3 && wapp_str8_equal(node->item, &s3);
+
+  node = wapp_dbl_list_get(Str8, &list, 3);
+  result = result && node->item == &s4 && wapp_str8_equal(node->item, &s4);
+
+  node = wapp_dbl_list_get(Str8, &list, 4);
+  result = result && node->item == &s5 && wapp_str8_equal(node->item, &s5);
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_list_push_front(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("1");
+  Str8 s2 = wapp_str8_lit("2");
+  Str8 s3 = wapp_str8_lit("3");
+
+  DBL_LIST(Str8) list = {0};
+  DBL_NODE(Str8) n1   = { .item = &s1 };
+  DBL_NODE(Str8) n2   = { .item = &s2 };
+  DBL_NODE(Str8) n3   = { .item = &s3 };
+
+  wapp_dbl_list_push_front(&list, &n1);
+  result = list.first == list.last && list.first == &n1 && list.first->item == &s1 && wapp_str8_list_total_size(&list) == 1 && list.node_count == 1;
+
+  wapp_dbl_list_push_front(&list, &n2);
+  result = result && list.first == &n2 && list.first->item == &s2 && wapp_str8_list_total_size(&list) == 2 && list.node_count == 2;
+
+  wapp_dbl_list_push_front(&list, &n3);
+  result = result && list.first == &n3 && list.first->item == &s3 && wapp_str8_list_total_size(&list) == 3 && list.node_count == 3;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_list_push_back(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("1");
+  Str8 s2 = wapp_str8_lit("2");
+  Str8 s3 = wapp_str8_lit("3");
+
+  DBL_LIST(Str8) list = {0};
+  DBL_NODE(Str8) n1   = { .item = &s1 };
+  DBL_NODE(Str8) n2   = { .item = &s2 };
+  DBL_NODE(Str8) n3   = { .item = &s3 };
+
+  wapp_dbl_list_push_back(&list, &n1);
+  result = list.first == list.last && list.last == &n1 && list.last->item == &s1 && wapp_str8_list_total_size(&list) == 1 && list.node_count == 1;
+
+  wapp_dbl_list_push_back(&list, &n2);
+  result = result && list.last == &n2 && list.last->item == &s2 && wapp_str8_list_total_size(&list) == 2 && list.node_count == 2;
+
+  wapp_dbl_list_push_back(&list, &n3);
+  result = result && list.last == &n3 && list.last->item == &s3 && wapp_str8_list_total_size(&list) == 3 && list.node_count == 3;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_list_insert(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("1");
+  Str8 s2 = wapp_str8_lit("2");
+  Str8 s3 = wapp_str8_lit("3");
+  Str8 s4 = wapp_str8_lit("4");
+  Str8 s5 = wapp_str8_lit("5");
+  Str8 s6 = wapp_str8_lit("6");
+  Str8 s7 = wapp_str8_lit("7");
+
+  DBL_LIST(Str8) list = {0};
+  DBL_NODE(Str8) n1   = { .item = &s1 };
+  DBL_NODE(Str8) n2   = { .item = &s2 };
+  DBL_NODE(Str8) n3   = { .item = &s3 };
+  DBL_NODE(Str8) n4   = { .item = &s4 };
+  DBL_NODE(Str8) n5   = { .item = &s5 };
+  DBL_NODE(Str8) n6   = { .item = &s6 };
+  DBL_NODE(Str8) n7   = { .item = &s7 };
+
+  wapp_dbl_list_push_back(&list, &n1);
+  wapp_dbl_list_push_back(&list, &n2);
+  wapp_dbl_list_push_back(&list, &n3);
+  wapp_dbl_list_push_back(&list, &n4);
+  wapp_dbl_list_push_back(&list, &n5);
+
+  DBL_NODE(Str8) *node;
+  wapp_dbl_list_insert(&list, &n6, 2);
+  node   = wapp_dbl_list_get(Str8, &list, 2);
+  result = node != NULL && node->item == &s6 && wapp_str8_list_total_size(&list) == 6 && list.node_count == 6;
+  wapp_dbl_list_insert(&list, &n7, 5);
+  node   = wapp_dbl_list_get(Str8, &list, 5);
+  result = result && node != NULL && node->item == &s7 && wapp_str8_list_total_size(&list) == 7 && list.node_count == 7;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_list_pop_front(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("1");
+  Str8 s2 = wapp_str8_lit("2");
+  Str8 s3 = wapp_str8_lit("3");
+  Str8 s4 = wapp_str8_lit("4");
+  Str8 s5 = wapp_str8_lit("5");
+
+  DBL_LIST(Str8) list = {0};
+  DBL_NODE(Str8) n1   = { .item = &s1 };
+  DBL_NODE(Str8) n2   = { .item = &s2 };
+  DBL_NODE(Str8) n3   = { .item = &s3 };
+  DBL_NODE(Str8) n4   = { .item = &s4 };
+  DBL_NODE(Str8) n5   = { .item = &s5 };
+
+  wapp_dbl_list_push_back(&list, &n1);
+  wapp_dbl_list_push_back(&list, &n2);
+  wapp_dbl_list_push_back(&list, &n3);
+  wapp_dbl_list_push_back(&list, &n4);
+  wapp_dbl_list_push_back(&list, &n5);
+
+  DBL_NODE(Str8) *node = wapp_dbl_list_pop_front(Str8, &list);
+  result = node == &n1 && node->item == &s1 && wapp_str8_equal(node->item, &s1) && wapp_str8_list_total_size(&list) == 4 && list.node_count == 4;
+
+  node = wapp_dbl_list_pop_front(Str8, &list);
+  result = result && node == &n2 && node->item == &s2 && wapp_str8_equal(node->item, &s2) && wapp_str8_list_total_size(&list) == 3 && list.node_count == 3;
+
+  node = wapp_dbl_list_pop_front(Str8, &list);
+  result = result && node == &n3 && node->item == &s3 && wapp_str8_equal(node->item, &s3) && wapp_str8_list_total_size(&list) == 2 && list.node_count == 2;
+
+  node = wapp_dbl_list_pop_front(Str8, &list);
+  result = result && node == &n4 && node->item == &s4 && wapp_str8_equal(node->item, &s4) && wapp_str8_list_total_size(&list) == 1 && list.node_count == 1;
+
+  node = wapp_dbl_list_pop_front(Str8, &list);
+  result = result && node == &n5 && node->item == &s5 && wapp_str8_equal(node->item, &s5) && wapp_str8_list_total_size(&list) == 0 && list.node_count == 0;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_list_pop_back(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("1");
+  Str8 s2 = wapp_str8_lit("2");
+  Str8 s3 = wapp_str8_lit("3");
+  Str8 s4 = wapp_str8_lit("4");
+  Str8 s5 = wapp_str8_lit("5");
+
+  DBL_LIST(Str8) list = {0};
+  DBL_NODE(Str8) n1   = { .item = &s1 };
+  DBL_NODE(Str8) n2   = { .item = &s2 };
+  DBL_NODE(Str8) n3   = { .item = &s3 };
+  DBL_NODE(Str8) n4   = { .item = &s4 };
+  DBL_NODE(Str8) n5   = { .item = &s5 };
+
+  wapp_dbl_list_push_front(&list, &n1);
+  wapp_dbl_list_push_front(&list, &n2);
+  wapp_dbl_list_push_front(&list, &n3);
+  wapp_dbl_list_push_front(&list, &n4);
+  wapp_dbl_list_push_front(&list, &n5);
+
+  DBL_NODE(Str8) *node = wapp_dbl_list_pop_back(Str8, &list);
+  result = node == &n1 && node->item == &s1 && wapp_str8_equal(node->item, &s1) && wapp_str8_list_total_size(&list) == 4 && list.node_count == 4;
+
+  node = wapp_dbl_list_pop_back(Str8, &list);
+  result = result && node == &n2 && node->item == &s2 && wapp_str8_equal(node->item, &s2) && wapp_str8_list_total_size(&list) == 3 && list.node_count == 3;
+
+  node = wapp_dbl_list_pop_back(Str8, &list);
+  result = result && node == &n3 && node->item == &s3 && wapp_str8_equal(node->item, &s3) && wapp_str8_list_total_size(&list) == 2 && list.node_count == 2;
+
+  node = wapp_dbl_list_pop_back(Str8, &list);
+  result = result && node == &n4 && node->item == &s4 && wapp_str8_equal(node->item, &s4) && wapp_str8_list_total_size(&list) == 1 && list.node_count == 1;
+
+  node = wapp_dbl_list_pop_back(Str8, &list);
+  result = result && node == &n5 && node->item == &s5 && wapp_str8_equal(node->item, &s5) && wapp_str8_list_total_size(&list) == 0 && list.node_count == 0;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_list_remove(void) {
+  bool result;
+
+  Str8 s1 = wapp_str8_lit("1");
+  Str8 s2 = wapp_str8_lit("2");
+  Str8 s3 = wapp_str8_lit("3");
+  Str8 s4 = wapp_str8_lit("4");
+  Str8 s5 = wapp_str8_lit("5");
+
+  DBL_LIST(Str8) list = {0};
+  DBL_NODE(Str8) n1   = { .item = &s1 };
+  DBL_NODE(Str8) n2   = { .item = &s2 };
+  DBL_NODE(Str8) n3   = { .item = &s3 };
+  DBL_NODE(Str8) n4   = { .item = &s4 };
+  DBL_NODE(Str8) n5   = { .item = &s5 };
+
+  wapp_dbl_list_push_back(&list, &n1);
+  wapp_dbl_list_push_back(&list, &n2);
+  wapp_dbl_list_push_back(&list, &n3);
+  wapp_dbl_list_push_back(&list, &n4);
+  wapp_dbl_list_push_back(&list, &n5);
+
+  DBL_NODE(Str8) *node = wapp_dbl_list_remove(Str8, &list, 0);
+  result = node == &n1 && node->item == &s1 && wapp_str8_equal(node->item, &s1) && wapp_str8_list_total_size(&list) == 4 && list.node_count == 4;
+
+  node = wapp_dbl_list_remove(Str8, &list, 0);
+  result = result && node == &n2 && node->item == &s2 && wapp_str8_equal(node->item, &s2) && wapp_str8_list_total_size(&list) == 3 && list.node_count == 3;
+
+  node = wapp_dbl_list_remove(Str8, &list, 0);
+  result = result && node == &n3 && node->item == &s3 && wapp_str8_equal(node->item, &s3) && wapp_str8_list_total_size(&list) == 2 && list.node_count == 2;
+
+  node = wapp_dbl_list_remove(Str8, &list, 0);
+  result = result && node == &n4 && node->item == &s4 && wapp_str8_equal(node->item, &s4) && wapp_str8_list_total_size(&list) == 1 && list.node_count == 1;
+
+  node = wapp_dbl_list_remove(Str8, &list, 0);
+  result = result && node == &n5 && node->item == &s5 && wapp_str8_equal(node->item, &s5) && wapp_str8_list_total_size(&list) == 0 && list.node_count == 0;
+
+  return wapp_tester_result(result);
+}
+
+TestFuncResult test_str8_list_empty(void) {
+  bool result;
+
+  DBL_LIST(Str8) list = {0};
+  wapp_dbl_list_push_back(&list, &wapp_str8_node_from_cstr("Hello"));
+  wapp_dbl_list_push_back(&list, &wapp_str8_node_from_cstr("from"));
+  wapp_dbl_list_push_back(&list, &wapp_str8_node_from_cstr("wizapp"));
+  wapp_dbl_list_push_back(&list, &wapp_str8_node_from_cstr("stdlib"));
+
+  wapp_dbl_list_empty(&list);
+
+  result = list.first == NULL && list.last == NULL && list.node_count == 0 && wapp_str8_list_total_size(&list) == 0;
+
+  return wapp_tester_result(result);
+}

tests/str8/test_str8_list.h

@@ -0,0 +1,23 @@
+#ifndef TEST_STR8_LIST_H
+#define TEST_STR8_LIST_H
+
+#include "wapp.h"
+
+#ifdef __cplusplus
+BEGIN_C_LINKAGE
+#endif // __cplusplus
+
+TestFuncResult test_str8_list_get(void);
+TestFuncResult test_str8_list_push_front(void);
+TestFuncResult test_str8_list_push_back(void);
+TestFuncResult test_str8_list_insert(void);
+TestFuncResult test_str8_list_pop_front(void);
+TestFuncResult test_str8_list_pop_back(void);
+TestFuncResult test_str8_list_remove(void);
+TestFuncResult test_str8_list_empty(void);
+
+#ifdef __cplusplus
+END_C_LINKAGE
+#endif // __cplusplus
+
+#endif // !TEST_STR8_LIST_H

tests/wapptest.c

@@ -1,13 +1,61 @@
+#include "test_str8.h"
+#include "test_str8_list.h"
+#include "test_allocator.h"
 #include "test_arena.h"
-#include "tester.h"
+#include "test_cpath.h"
+#include "test_shell_commander.h"
+#include "wapp.h"
 #include <stdlib.h>
 
 int main(void) {
-  wapp_tester_run_tests(test_arena_init,
+  wapp_tester_run_tests(test_arena_allocator,
+                        test_arena_init,
                         test_arena_init_succeeds_when_reserving_very_large_size,
                         test_arena_alloc_succeeds_when_within_capacity,
                         test_arena_alloc_fails_when_over_capacity,
-                        test_arena_clear, test_arena_destroy);
+                        test_arena_realloc_bigger_size,
+                        test_arena_realloc_smaller_size,
+                        test_arena_clear,
+                        test_arena_destroy,
+                        test_str8_lit,
+                        test_str8_lit_ro,
+                        test_str8_buf,
+                        test_str8_alloc_buf,
+                        test_str8_alloc_cstr,
+                        test_str8_alloc_str8,
+                        test_str8_alloc_substr,
+                        test_str8_alloc_concat,
+                        test_str8_get_index_within_bounds,
+                        test_str8_get_index_out_of_bounds,
+                        test_str8_set,
+                        test_str8_equal,
+                        test_str8_slice,
+                        test_str8_concat_capped,
+                        test_str8_copy_cstr_capped,
+                        test_str8_copy_str8_capped,
+                        test_str8_format,
+                        test_str8_find,
+                        test_str8_rfind,
+                        test_str8_split,
+                        test_str8_split_with_max,
+                        test_str8_rsplit,
+                        test_str8_rsplit_with_max,
+                        test_str8_join,
+                        test_str8_list_get,
+                        test_str8_list_push_front,
+                        test_str8_list_push_back,
+                        test_str8_list_insert,
+                        test_str8_list_pop_front,
+                        test_str8_list_pop_back,
+                        test_str8_list_remove,
+                        test_str8_list_empty,
+                        test_cpath_join_path,
+                        test_cpath_dirname,
+                        test_cpath_dirup,
+                        test_commander_cmd_success,
+                        test_commander_cmd_failure,
+                        test_commander_cmd_out_buf_success,
+                        test_commander_cmd_out_buf_failure);
 
   return EXIT_SUCCESS;
 }