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db873f32 | 1 | /* Copyright (C) 1991, 1996, 1997, 1999 Free Software Foundation, Inc. |
c84142e8 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library 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 GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
22d57dd3 | 19 | #include <errno.h> |
28f540f4 | 20 | #include <grp.h> |
5107cf1d | 21 | #include <bits/libc-lock.h> |
db873f32 | 22 | #include <stdio.h> |
22d57dd3 | 23 | #include <stdlib.h> |
5f0e6fc7 RM |
24 | |
25 | ||
22d57dd3 UD |
26 | /* We need to protect the dynamic buffer handling. */ |
27 | __libc_lock_define_initialized (static, lock); | |
28 | ||
1dc3d266 UD |
29 | static char *buffer; |
30 | ||
5f0e6fc7 | 31 | /* Read one entry from the given stream. */ |
28f540f4 | 32 | struct group * |
5f0e6fc7 | 33 | fgetgrent (FILE *stream) |
28f540f4 | 34 | { |
22d57dd3 | 35 | static size_t buffer_size; |
ba1ffaa1 | 36 | static struct group resbuf; |
db873f32 | 37 | fpos_t pos; |
ba1ffaa1 | 38 | struct group *result; |
22d57dd3 UD |
39 | int save; |
40 | ||
db873f32 UD |
41 | if (fgetpos (stream, &pos) != 0) |
42 | return NULL; | |
43 | ||
22d57dd3 UD |
44 | /* Get lock. */ |
45 | __libc_lock_lock (lock); | |
46 | ||
47 | /* Allocate buffer if not yet available. */ | |
48 | if (buffer == NULL) | |
49 | { | |
50 | buffer_size = NSS_BUFLEN_GROUP; | |
51 | buffer = malloc (buffer_size); | |
52 | } | |
53 | ||
54 | while (buffer != NULL | |
e1c6ee83 UD |
55 | && (__fgetgrent_r (stream, &resbuf, buffer, buffer_size, &result) |
56 | == ERANGE)) | |
22d57dd3 UD |
57 | { |
58 | char *new_buf; | |
59 | buffer_size += NSS_BUFLEN_GROUP; | |
60 | new_buf = realloc (buffer, buffer_size); | |
61 | if (new_buf == NULL) | |
62 | { | |
63 | /* We are out of memory. Free the current buffer so that the | |
64 | process gets a chance for a normal termination. */ | |
65 | save = errno; | |
66 | free (buffer); | |
67 | __set_errno (save); | |
68 | } | |
69 | buffer = new_buf; | |
db873f32 UD |
70 | |
71 | /* Reset the stream. */ | |
72 | if (fsetpos (stream, &pos) != 0) | |
e1c6ee83 | 73 | buffer = NULL; |
22d57dd3 UD |
74 | } |
75 | ||
76 | if (buffer == NULL) | |
77 | result = NULL; | |
5f0e6fc7 | 78 | |
22d57dd3 UD |
79 | /* Release lock. Preserve error value. */ |
80 | save = errno; | |
81 | __libc_lock_unlock (lock); | |
82 | __set_errno (save); | |
ba1ffaa1 UD |
83 | |
84 | return result; | |
28f540f4 | 85 | } |
1dc3d266 UD |
86 | |
87 | ||
88 | /* Free all resources if necessary. */ | |
89 | static void __attribute__ ((unused)) | |
90 | free_mem (void) | |
91 | { | |
92 | if (buffer != NULL) | |
93 | free (buffer); | |
94 | } | |
95 | ||
96 | text_set_element (__libc_subfreeres, free_mem); |