recursive mkdir()

recursive_mkdir.c

int recursive_mkdir(const char *dir, mode_t mode)
{
	assert(dir && *dir);

	// already exist
	if (access(dir, F_OK) == 0) {
		return 0;
	}

	size_t len;
	len = strlen(dir);

	char* tmp = (char*) malloc(len);
	strcpy(tmp, dir);
	if (tmp[len - 1] == '/')
		tmp[len - 1] = '\0';

	char *p = NULL;
	for (p = tmp + 1; *p; p++) {
		if (*p == '/') {
			*p = 0;
			if (mkdir(tmp, mode) == -1) {
				if (errno != EEXIST) {
					return -1;
				}
			}
			*p = '/';
		}
	}

	// No need to check existence here, because we've checked at start.
	if (mkdir(tmp, mode) == -1)
		return -1;

	return 0;
}