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6b9fecdc | 1 | /* Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc. |
19361cb7 | 2 | This file is part of the GNU C Library. |
267ca16a | 3 | |
19361cb7 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
267ca16a | 8 | |
19361cb7 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
267ca16a | 13 | |
41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
267ca16a | 18 | |
22d57dd3 | 19 | #include <errno.h> |
5107cf1d | 20 | #include <bits/libc-lock.h> |
267ca16a | 21 | #include <shadow.h> |
e1c6ee83 | 22 | #include <stdio.h> |
22d57dd3 | 23 | #include <stdlib.h> |
267ca16a UD |
24 | |
25 | ||
22d57dd3 UD |
26 | /* A reasonable size for a buffer to start with. */ |
27 | #define BUFLEN_SPWD 1024 | |
28 | ||
29 | /* We need to protect the dynamic buffer handling. */ | |
30 | __libc_lock_define_initialized (static, lock); | |
31 | ||
e1c6ee83 UD |
32 | static char *buffer; |
33 | ||
267ca16a UD |
34 | /* Read one shadow entry from the given stream. */ |
35 | struct spwd * | |
36 | fgetspent (FILE *stream) | |
37 | { | |
22d57dd3 | 38 | static size_t buffer_size; |
ba1ffaa1 | 39 | static struct spwd resbuf; |
e1c6ee83 | 40 | fpos_t pos; |
ba1ffaa1 | 41 | struct spwd *result; |
22d57dd3 UD |
42 | int save; |
43 | ||
e1c6ee83 UD |
44 | if (fgetpos (stream, &pos) != 0) |
45 | return NULL; | |
46 | ||
22d57dd3 UD |
47 | /* Get lock. */ |
48 | __libc_lock_lock (lock); | |
49 | ||
50 | /* Allocate buffer if not yet available. */ | |
51 | if (buffer == NULL) | |
52 | { | |
53 | buffer_size = BUFLEN_SPWD; | |
54 | buffer = malloc (buffer_size); | |
55 | } | |
56 | ||
57 | while (buffer != NULL | |
e1c6ee83 UD |
58 | && (__fgetspent_r (stream, &resbuf, buffer, buffer_size, &result) |
59 | == ERANGE)) | |
22d57dd3 UD |
60 | { |
61 | char *new_buf; | |
62 | buffer_size += BUFLEN_SPWD; | |
63 | new_buf = realloc (buffer, buffer_size); | |
64 | if (new_buf == NULL) | |
65 | { | |
66 | /* We are out of memory. Free the current buffer so that the | |
67 | process gets a chance for a normal termination. */ | |
68 | save = errno; | |
69 | free (buffer); | |
70 | __set_errno (save); | |
71 | } | |
72 | buffer = new_buf; | |
e1c6ee83 UD |
73 | |
74 | /* Reset the stream. */ | |
75 | if (fsetpos (stream, &pos) != 0) | |
76 | buffer = NULL; | |
22d57dd3 UD |
77 | } |
78 | ||
79 | if (buffer == NULL) | |
80 | result = NULL; | |
81 | ||
82 | /* Release lock. Preserve error value. */ | |
83 | save = errno; | |
84 | __libc_lock_unlock (lock); | |
85 | __set_errno (save); | |
267ca16a | 86 | |
22d57dd3 | 87 | return result; |
267ca16a | 88 | } |
e1c6ee83 UD |
89 | |
90 | ||
91 | /* Free all resources if necessary. */ | |
92 | static void __attribute__ ((unused)) | |
93 | free_mem (void) | |
94 | { | |
6b9fecdc | 95 | free (buffer); |
e1c6ee83 UD |
96 | } |
97 | ||
98 | text_set_element (__libc_subfreeres, free_mem); |