Implement the functions

compile_commands.json

@@ -0,0 +1,79 @@
+[
+  {
+    "arguments": [
+      "/usr/bin/clang",
+      "-c",
+      "-I./include",
+      "-fPIC",
+      "-o",
+      "dstring.so",
+      "src/dstring.c"
+    ],
+    "directory": "/mnt/3A5CDF785CDF2CFF/Users/abdoo/dev/dstring",
+    "file": "/mnt/3A5CDF785CDF2CFF/Users/abdoo/dev/dstring/src/dstring.c",
+    "output": "/mnt/3A5CDF785CDF2CFF/Users/abdoo/dev/dstring/dstring.so"
+  },
+  {
+    "arguments": [
+      "/usr/bin/clang-16",
+      "-cc1",
+      "-triple",
+      "x86_64-redhat-linux-gnu",
+      "-emit-obj",
+      "-mrelax-all",
+      "-disable-free",
+      "-clear-ast-before-backend",
+      "-disable-llvm-verifier",
+      "-discard-value-names",
+      "-main-file-name",
+      "-mrelocation-model",
+      "pic",
+      "-pic-level",
+      "2",
+      "-fhalf-no-semantic-interposition",
+      "-mframe-pointer=all",
+      "-fmath-errno",
+      "-ffp-contract=on",
+      "-fno-rounding-math",
+      "-mconstructor-aliases",
+      "-funwind-tables=2",
+      "-target-cpu",
+      "x86-64",
+      "-tune-cpu",
+      "generic",
+      "-mllvm",
+      "-treat-scalable-fixed-error-as-warning",
+      "-debugger-tuning=gdb",
+      "-fcoverage-compilation-dir=/mnt/3A5CDF785CDF2CFF/Users/abdoo/dev/dstring",
+      "-resource-dir",
+      "/usr/lib64/clang/16",
+      "-I",
+      "./include",
+      "-internal-isystem",
+      "/usr/lib64/clang/16/include",
+      "-internal-isystem",
+      "/usr/local/include",
+      "-internal-isystem",
+      "/usr/bin/../lib/gcc/x86_64-redhat-linux/13/../../../../x86_64-redhat-linux/include",
+      "-internal-externc-isystem",
+      "/include",
+      "-internal-externc-isystem",
+      "/usr/include",
+      "-fdebug-compilation-dir=/mnt/3A5CDF785CDF2CFF/Users/abdoo/dev/dstring",
+      "-ferror-limit",
+      "19",
+      "-fgnuc-version=4.2.1",
+      "-fcolor-diagnostics",
+      "-faddrsig",
+      "-D__GCC_HAVE_DWARF2_CFI_ASM=1",
+      "-x",
+      "c",
+      "-o",
+      "/tmp/dstring-694812.o",
+      "src/dstring.c"
+    ],
+    "directory": "/mnt/3A5CDF785CDF2CFF/Users/abdoo/dev/dstring",
+    "file": "/mnt/3A5CDF785CDF2CFF/Users/abdoo/dev/dstring/src/dstring.c",
+    "output": "/tmp/dstring-694812.o"
+  }
+]

src/dstring.c

@@ -0,0 +1,211 @@
+#include "dstring.h"
+#include "aliases.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
+
+struct dstring {
+  u64 capacity;
+  u64 size;
+  char buf[];
+};
+
+dstr_t *dstr_with_capacity(u64 capacity) {
+  dstr_t *out = (dstr_t *)malloc(sizeof(dstr_t) + capacity + 1);
+
+  if (!out) {
+    return NULL;
+  }
+
+  out->capacity = capacity;
+  out->size = 0;
+  memset(out->buf, 0, capacity + 1);
+
+  return out;
+}
+
+dstr_t *dstr_from_string(const char *str) {
+  u64 length = strlen(str);
+
+  u64 capacity = length * CAPACITY_SCALAR;
+
+  dstr_t *out = dstr_with_capacity(capacity);
+
+  if (!out) {
+    return NULL;
+  }
+
+  out->size = length;
+  strncpy(out->buf, str, length);
+
+  return out;
+}
+
+void dstr_update(dstr_t **dst, const char *src) {
+  if (!(*dst)) {
+    return;
+  }
+
+  u64 length = strlen(src);
+
+  dstr_t *str = *dst;
+
+  if (length <= str->capacity) {
+    memset(str->buf, 0, str->capacity);
+
+    str->size = length;
+
+    strncpy(str->buf, src, length);
+  } else {
+    u64 capacity = length * CAPACITY_SCALAR;
+
+    dstr_t *tmp = (dstr_t *)realloc(*dst, sizeof(dstr_t) + capacity + 1);
+
+    if (!tmp) {
+      return;
+    }
+
+    tmp->capacity = capacity;
+    tmp->size = length;
+    strncpy(tmp->buf, src, length);
+
+    *dst = tmp;
+  }
+}
+
+void dstr_free(dstr_t **str) {
+  if (!(*str)) {
+    return;
+  }
+
+  free(*str);
+  *str = NULL;
+}
+
+void dstr_concat(dstr_t **dst, const char *src) {
+  if (!(*dst)) {
+    return;
+  }
+
+  u64 src_length = strlen(src);
+
+  if (src_length == 0) {
+    return;
+  }
+
+  u64 new_length = (*dst)->size + src_length;
+
+  char str[new_length + 1];
+  memset(str, 0, new_length + 1);
+
+  strncpy(str, (*dst)->buf, (*dst)->size);
+  strncat(str, src, src_length);
+
+  dstr_update(dst, str);
+}
+
+void dstr_append(dstr_t **dst, char c) {
+  if (!(*dst)) {
+    return;
+  }
+
+  u64 new_length = (*dst)->size + 1;
+
+  char str[new_length + 1];
+  memset(str, 0, new_length + 1);
+
+  strncpy(str, (*dst)->buf, (*dst)->size);
+  str[(*dst)->size] = c;
+
+  dstr_update(dst, str);
+}
+
+void dstr_resize(dstr_t **str) {
+  u64 capacity = (*str)->size;
+
+  dstr_t *tmp = (dstr_t *)realloc(*str, sizeof(dstr_t) + capacity + 1);
+
+  if (!tmp) {
+    return;
+  }
+
+  tmp->capacity = capacity;
+
+  *str = tmp;
+}
+
+void dstr_clear(dstr_t *str) {
+  if (!str || str->size == 0) {
+    return;
+  }
+
+  memset(str->buf, 0, str->capacity);
+  str->size = 0;
+}
+
+void dstr_print(const dstr_t *str) {
+  if (!str) {
+    return;
+  }
+
+  printf("%s\n", str->buf);
+}
+
+i64 dstr_find(const dstr_t *str, const char *substr) {
+  if (!str || !substr) {
+    return -1;
+  }
+
+  u64 substr_length = strlen(substr);
+
+  if (substr_length == 0 || substr_length > str->size) {
+    return -1;
+  }
+
+  char buf[substr_length + 1];
+  memset(buf, 0, substr_length + 1);
+
+  for (i64 i = 0; i < str->size; ++i) {
+    if (i + substr_length >= str->size) {
+      break;
+    }
+
+    for (u64 j = 0; j < substr_length; ++j) {
+      buf[j] = str->buf[i + j];
+    }
+
+    if (strcmp(buf, substr) == 0) {
+      return i;
+    }
+  }
+
+  return -1;
+}
+
+u64 dstr_length(const dstr_t *str) {
+  if (!str) {
+    return 0;
+  }
+
+  return str->size;
+}
+
+u64 dstr_capacity(const dstr_t *str) {
+  if (!str) {
+    return 0;
+  }
+
+  return str->capacity;
+}
+
+const char *dstr_to_cstr(const dstr_t *str) {
+  if (!str) {
+    return "";
+  }
+
+  return str->buf;
+}