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#include <filesystem.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
size_t get_file_size(FILE* file) {
assert(file);
const long int starting_pos = ftell(file);
if (starting_pos == -1) {
return (size_t)-1;
}
if (fseek(file, 0, SEEK_END) != 0) {
return (size_t)-1;
}
const size_t file_size = ftell(file);
if (file_size == (size_t)-1) {
return (size_t)-1;
}
if (fseek(file, starting_pos, SEEK_SET) != 0) {
return (size_t)-1;
}
return file_size;
}
void* read_file(const char* filepath) {
assert(filepath);
void* data = 0;
FILE* file = fopen(filepath, "rb");
if (!file) {
return 0;
}
const size_t file_size = get_file_size(file);
if (file_size == (size_t)-1) {
goto cleanup;
}
data = calloc(1, file_size);
if (!data) {
goto cleanup;
}
if (fread(data, 1, file_size, file) != file_size) {
goto cleanup;
}
return data;
cleanup:
fclose(file);
if (data) {
free(data);
}
return 0;
}
bool make_relative_path(
const char* filepath, const char* path, char* relative,
size_t relative_length) {
assert(filepath);
assert(path);
assert(relative);
const size_t filepath_len = strlen(filepath);
const size_t path_len = strlen(path);
assert(filepath_len < relative_length);
assert(path_len < relative_length);
// Handle empty filepath.
if (filepath_len == 0) {
memcpy(relative, path, path_len);
return true;
}
// Search for the last / in the tile map file path to get its parent
// directory.
assert(filepath_len > 0);
size_t tm_dir_len = 0;
for (tm_dir_len = strlen(filepath) - 1; tm_dir_len > 0; --tm_dir_len) {
if (filepath[tm_dir_len] == '/') {
break;
}
}
tm_dir_len++; // Preserve the backslash.
// Copy the tile set file path where the parent dir ends.
// Make sure there is enough space in the output.
if ((tm_dir_len + path_len + 1) >= relative_length) {
return false;
}
memcpy(relative, filepath, tm_dir_len);
memcpy(&relative[tm_dir_len], path, path_len);
return true;
}
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