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source: kBuild/vendor/grep/2.12/lib/getcwd-lgpl.c@ 2595

Last change on this file since 2595 was 2595, checked in by bird, 12 years ago

gnu grep version 2.12 (grep-2.12.tar.xz, md5sum=8d2f0346d08b13c18afb81f0e8aa1e2f)

  • Property svn:eol-style set to native
File size: 3.0 KB
Line 
1/* Copyright (C) 2011-2012 Free Software Foundation, Inc.
2 This file is part of gnulib.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
16
17#include <config.h>
18
19/* Specification */
20#include <unistd.h>
21
22#include <errno.h>
23#include <string.h>
24
25#if GNULIB_GETCWD
26/* Favor GPL getcwd.c if both getcwd and getcwd-lgpl modules are in use. */
27typedef int dummy;
28#else
29
30/* Get the name of the current working directory, and put it in SIZE
31 bytes of BUF. Returns NULL if the directory couldn't be determined
32 (perhaps because the absolute name was longer than PATH_MAX, or
33 because of missing read/search permissions on parent directories)
34 or SIZE was too small. If successful, returns BUF. If BUF is
35 NULL, an array is allocated with 'malloc'; the array is SIZE bytes
36 long, unless SIZE == 0, in which case it is as big as
37 necessary. */
38
39# undef getcwd
40char *
41rpl_getcwd (char *buf, size_t size)
42{
43 char *ptr;
44 char *result;
45
46 /* Handle single size operations. */
47 if (buf)
48 {
49 if (!size)
50 {
51 errno = EINVAL;
52 return NULL;
53 }
54 return getcwd (buf, size);
55 }
56
57 if (size)
58 {
59 buf = malloc (size);
60 if (!buf)
61 {
62 errno = ENOMEM;
63 return NULL;
64 }
65 result = getcwd (buf, size);
66 if (!result)
67 {
68 int saved_errno = errno;
69 free (buf);
70 errno = saved_errno;
71 }
72 return result;
73 }
74
75 /* Flexible sizing requested. Avoid over-allocation for the common
76 case of a name that fits within a 4k page, minus some space for
77 local variables, to be sure we don't skip over a guard page. */
78 {
79 char tmp[4032];
80 size = sizeof tmp;
81 ptr = getcwd (tmp, size);
82 if (ptr)
83 {
84 result = strdup (ptr);
85 if (!result)
86 errno = ENOMEM;
87 return result;
88 }
89 if (errno != ERANGE)
90 return NULL;
91 }
92
93 /* My what a large directory name we have. */
94 do
95 {
96 size <<= 1;
97 ptr = realloc (buf, size);
98 if (ptr == NULL)
99 {
100 free (buf);
101 errno = ENOMEM;
102 return NULL;
103 }
104 buf = ptr;
105 result = getcwd (buf, size);
106 }
107 while (!result && errno == ERANGE);
108
109 if (!result)
110 {
111 int saved_errno = errno;
112 free (buf);
113 errno = saved_errno;
114 }
115 else
116 {
117 /* Trim to fit, if possible. */
118 result = realloc (buf, strlen (buf) + 1);
119 if (!result)
120 result = buf;
121 }
122 return result;
123}
124
125#endif
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