gists/c-programming/strings/portable_basename.c

/*
 * portable_basename.c
 *
 * Author: Intel A80486DX2-66
 * License: Unlicense
 */

#include "portable_basename.h"

static char* correct_slashes(const char* path) {
	char* new_path = strdup(path);
	if (new_path == NULL)
		return NULL;

	char* ptr = new_path;
	while (*ptr != '\0') {
		if (*ptr == '\\')
			*ptr = '/';
		ptr++;
	}

	return new_path;
}

char* portable_basename(const char* raw_path) {
	char* path = correct_slashes(raw_path);
	if (path == NULL)
		return NULL;

	char* base = malloc(FILENAME_MAX * sizeof(char));
	if (base == NULL) {
		free(path);
		return NULL;
	}

	size_t fname_len = strlen(path);

	const char* last_slash = strrchr(path, '/');
	if (last_slash != NULL)
		fname_len = strlen(last_slash + 1);

	memcpy(base, last_slash + 1, fname_len);
	base[fname_len] = '\0';

	return base;
}