Initial file operations implementation

src/core/file/file.c

@@ -0,0 +1,103 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "file.h"
+#include "../os/cpath/cpath.h"
+#include "../../common/assert/assert.h"
+#include "../../common/aliases/aliases.h"
+#include "../../primitives/array/array.h"
+#include "../../primitives/strings/str8/str8.h"
+#include <stdio.h>
+
+File *wapp_file_open(Str8RO *filepath, FileAccessMode mode) {
+  persistent const char *modes[FILE_ACCESS_MODE_COUNT] = {
+    [WAPP_FA_MODE_R]      = "r",
+    [WAPP_FA_MODE_W]      = "w",
+    [WAPP_FA_MODE_A]      = "a",
+    [WAPP_FA_MODE_R_EX]   = "r+",
+    [WAPP_FA_MODE_W_EX]   = "w+",
+    [WAPP_FA_MODE_A_EX]   = "a+",
+    [WAPP_FA_MODE_RB]     = "rb",
+    [WAPP_FA_MODE_WB]     = "wb",
+    [WAPP_FA_MODE_AB]     = "ab",
+    [WAPP_FA_MODE_RB_EX]  = "rb+",
+    [WAPP_FA_MODE_WB_EX]  = "wb+",
+    [WAPP_FA_MODE_AB_EX]  = "ab+",
+    [WAPP_FA_MODE_WX]     = "wx",
+    [WAPP_FA_MODE_WX_EX]  = "wx+",
+    [WAPP_FA_MODE_WBX]    = "wbx",
+    [WAPP_FA_MODE_WBX_EX] = "wbx+",
+  };
+  persistent c8 tmp[WAPP_PATH_MAX] = {0};
+  wapp_debug_assert(filepath->size < WAPP_PATH_MAX, "`filepath` exceeds max path limit.");
+
+  memset(tmp, 0, WAPP_PATH_MAX);
+  memcpy(tmp, filepath->buf, filepath->size);
+
+  return fopen((const char *)tmp, modes[mode]);
+}
+
+u64 wapp_file_get_current_position(File *file) {
+  wapp_debug_assert(file != NULL, "`file` should not be NULL.");
+  return (u64)ftell(file);
+}
+
+i32 wapp_file_seek(File *file, u64 offset, FileSeekOrigin origin) {
+  wapp_debug_assert(file != NULL, "`file` should not be NULL.");
+  return fseek(file, offset, origin);
+}
+
+u64 wapp_file_get_length(File *file) {
+  wapp_debug_assert(file != NULL, "`file` should not be NULL.");
+
+  u64 current = wapp_file_get_current_position(file);
+
+  wapp_file_seek(file, 0, WAPP_SEEK_END);
+
+  u64 output = ftell(file);
+
+  // Restore position
+  wapp_file_seek(file, current, WAPP_SEEK_START);
+
+  return output;
+}
+
+u64 wapp_file_read(GenericArray *dst, File *file, u64 item_count) {
+  wapp_debug_assert(dst != NULL && dst->items != NULL && file != NULL,
+                    "`dst`, `dst->items` and `file` should not be NULL.");
+
+  u64 file_length       = wapp_file_get_length(file);
+  u64 dst_byte_capacity = dst->item_size * dst->capacity;
+  u64 req_byte_count    = item_count * dst->item_size;
+  u64 copy_byte_count   = 0;
+
+  if (req_byte_count <= file_length && req_byte_count <= dst_byte_capacity) {
+    copy_byte_count = req_byte_count;
+  } else {
+    copy_byte_count = file_length <= dst_byte_capacity ? file_length : dst_byte_capacity;
+  }
+
+  dst->count = fread(dst->items, sizeof(u8), copy_byte_count, file) / dst->item_size;
+
+  return dst->count;
+}
+
+u64 wapp_file_write(const GenericArray *src, File *file, u64 item_count) {
+  wapp_debug_assert(src != NULL && src->items != NULL && file != NULL,
+                    "`src`, `src->items` and `file` should not be NULL.");
+
+  u64 src_byte_count = src->count * src->item_size;
+  u64 req_byte_count = item_count * src->item_size;
+  u64 to_copy        = req_byte_count <= src_byte_count ? req_byte_count : src_byte_count;
+
+  return fwrite(src->items, sizeof(u8), to_copy, file);
+}
+
+i32 wapp_file_flush(File *file) {
+  wapp_debug_assert(file != NULL, "`file` should not be NULL.");
+  return fflush(file);
+}
+
+i32 wapp_file_close(File *file) {
+  wapp_debug_assert(file != NULL, "`file` should not be NULL.");
+  return fclose(file);
+}

src/core/file/file.h

@@ -0,0 +1,57 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef FILE_H
+#define FILE_H
+
+#include "../../common/aliases/aliases.h"
+#include "../../primitives/array/array.h"
+#include "../../primitives/strings/str8/str8.h"
+#include <stdio.h>
+
+#ifdef WAPP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
+typedef FILE File;
+
+typedef enum {
+  WAPP_FA_MODE_R,      // Equivalent to r
+  WAPP_FA_MODE_W,      // Equivalent to w
+  WAPP_FA_MODE_A,      // Equivalent to a
+  WAPP_FA_MODE_R_EX,   // Equivalent to r+
+  WAPP_FA_MODE_W_EX,   // Equivalent to w+
+  WAPP_FA_MODE_A_EX,   // Equivalent to a+
+  WAPP_FA_MODE_RB,     // Equivalent to rb
+  WAPP_FA_MODE_WB,     // Equivalent to wb
+  WAPP_FA_MODE_AB,     // Equivalent to ab
+  WAPP_FA_MODE_RB_EX,  // Equivalent to rb+
+  WAPP_FA_MODE_WB_EX,  // Equivalent to wb+
+  WAPP_FA_MODE_AB_EX,  // Equivalent to ab+
+  WAPP_FA_MODE_WX,     // Equivalent to wx
+  WAPP_FA_MODE_WX_EX,  // Equivalent to wx+
+  WAPP_FA_MODE_WBX,    // Equivalent to wbx
+  WAPP_FA_MODE_WBX_EX, // Equivalent to wbx+
+
+  FILE_ACCESS_MODE_COUNT,
+} FileAccessMode;
+
+typedef enum {
+  WAPP_SEEK_START   = SEEK_SET,
+  WAPP_SEEK_CURRENT = SEEK_CUR,
+  WAPP_SEEK_END     = SEEK_END,
+} FileSeekOrigin;
+
+File *wapp_file_open(Str8RO *filename, FileAccessMode mode);
+u64   wapp_file_get_current_position(File *file);
+i32   wapp_file_seek(File *file, u64 offset, FileSeekOrigin origin);
+u64   wapp_file_get_length(File *file);
+u64   wapp_file_read(GenericArray *dst, File *file, u64 item_count);
+u64   wapp_file_write(const GenericArray *src, File *file, u64 item_count);
+i32   wapp_file_flush(File *file);
+i32   wapp_file_close(File *file);
+
+#ifdef WAPP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
+#endif // !FILE_H

src/core/wapp_core.c

@@ -4,6 +4,7 @@
 #define WAPP_CORE_C
 
 #include "wapp_core.h"
+#include "file/file.c"
 #include "os/shell/termcolour/posix/termcolour_posix.c"
 #include "os/shell/termcolour/win/termcolour_win.c"
 #include "os/shell/termcolour/termcolour.c"

src/core/wapp_core.h

@@ -3,6 +3,7 @@
 #ifndef WAPP_CORE_H
 #define WAPP_CORE_H
 
+#include "file/file.h"
 #include "os/shell/termcolour/termcolour.h"
 #include "os/shell/termcolour/terminal_colours.h"
 #include "os/shell/commander/commander.h"