Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / getcwd.c
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1/*
2 * Copyright (c) 1989, 1991, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: src/lib/libc/gen/getcwd.c,v 1.18 1999/09/28 13:24:13 marcel Exp $
4763229c 34 * $DragonFly: src/lib/libc/gen/getcwd.c,v 1.6 2005/04/26 06:04:56 joerg Exp $
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35 *
36 * @(#)getcwd.c 8.5 (Berkeley) 2/7/95
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37 */
38
984263bc 39#include <sys/param.h>
984263bc 40#include <stdlib.h>
984263bc 41#include <unistd.h>
984263bc 42
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43int __getcwd(char *pt, size_t size);
44
984263bc 45char *
f6625211 46getcwd(char *pt, size_t size)
984263bc 47{
4763229c 48 int allocated = 0, ret;
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49
50 /*
51 * If no buffer specified by the user, allocate one as necessary.
984263bc 52 */
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53 if (pt == NULL) {
54 size = MAXPATHLEN;
55 if ((pt = malloc(MAXPATHLEN)) == NULL)
56 return(NULL);
57 allocated = 1;
984263bc 58 }
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59 ret = __getcwd(pt, size);
60 if (ret == 0)
61 return (pt);
62 if (allocated)
984263bc 63 free(pt);
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64 return (NULL);
65}