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comparison libiberty/getcwd.c @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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-1:000000000000 0:a06113de4d67
1 /* Emulate getcwd using getwd.
2 This function is in the public domain. */
3
4 /*
5
6 @deftypefn Supplemental char* getcwd (char *@var{pathname}, int @var{len})
7
8 Copy the absolute pathname for the current working directory into
9 @var{pathname}, which is assumed to point to a buffer of at least
10 @var{len} bytes, and return a pointer to the buffer. If the current
11 directory's path doesn't fit in @var{len} characters, the result is
12 @code{NULL} and @code{errno} is set. If @var{pathname} is a null pointer,
13 @code{getcwd} will obtain @var{len} bytes of space using
14 @code{malloc}.
15
16 @end deftypefn
17
18 */
19
20 #include "config.h"
21
22 #ifdef HAVE_SYS_PARAM_H
23 #include <sys/param.h>
24 #endif
25 #include <errno.h>
26 #ifdef HAVE_STRING_H
27 #include <string.h>
28 #endif
29 #ifdef HAVE_STDLIB_H
30 #include <stdlib.h>
31 #endif
32
33 extern char *getwd ();
34 extern int errno;
35
36 #ifndef MAXPATHLEN
37 #define MAXPATHLEN 1024
38 #endif
39
40 char *
41 getcwd (char *buf, size_t len)
42 {
43 char ourbuf[MAXPATHLEN];
44 char *result;
45
46 result = getwd (ourbuf);
47 if (result) {
48 if (strlen (ourbuf) >= len) {
49 errno = ERANGE;
50 return 0;
51 }
52 if (!buf) {
53 buf = (char*)malloc(len);
54 if (!buf) {
55 errno = ENOMEM;
56 return 0;
57 }
58 }
59 strcpy (buf, ourbuf);
60 }
61 return buf;
62 }