sortix--sortix/libc/unistd/getcwd.c

/*
 * Copyright (c) 2011, 2012, 2014 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * unistd/getcwd.c
 * Returns the current working directory.
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

char* getcwd(char* buf, size_t size)
{
	char* cwd = canonicalize_file_name(".");
	if ( !cwd )
		return NULL;
	if ( !buf )
		return cwd;
	if ( size <= strlcpy(buf, cwd, size) )
	{
		free(cwd);
		errno = ERANGE;
		return NULL;
	}
	free(cwd);
	return buf;
}