busybox/libbb/concat_path_file.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) many different people.
 * If you wrote this, please acknowledge your work.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */
#include "libbb.h"

/* Concatenate path and filename to new allocated buffer.
 * Add '/' only as needed (no duplicate // are produced).
 * If path is NULL, it is assumed to be "/".
 * filename should not be NULL.
 */

char* FAST_FUNC concat_path_file(const char *path, const char *filename)
{
	char *lc;

	if (!path)
		path = "";
	lc = last_char_is(path, '/');
	while (*filename == '/')
		filename++;
	return xasprintf("%s%s%s", path, (lc==NULL ? "/" : ""), filename);
}