]>
Commit | Line | Data |
---|---|---|
04277e02 | 1 | /* Copyright (C) 1996-2019 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 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
267ca16a | 17 | |
22d57dd3 | 18 | #include <errno.h> |
ec999b8e | 19 | #include <libc-lock.h> |
267ca16a | 20 | #include <shadow.h> |
e1c6ee83 | 21 | #include <stdio.h> |
22d57dd3 | 22 | #include <stdlib.h> |
267ca16a UD |
23 | |
24 | ||
22d57dd3 UD |
25 | /* A reasonable size for a buffer to start with. */ |
26 | #define BUFLEN_SPWD 1024 | |
27 | ||
28 | /* We need to protect the dynamic buffer handling. */ | |
29 | __libc_lock_define_initialized (static, lock); | |
30 | ||
c877418f | 31 | libc_freeres_ptr (static char *buffer); |
e1c6ee83 | 32 | |
267ca16a UD |
33 | /* Read one shadow entry from the given stream. */ |
34 | struct spwd * | |
35 | fgetspent (FILE *stream) | |
36 | { | |
22d57dd3 | 37 | static size_t buffer_size; |
ba1ffaa1 | 38 | static struct spwd resbuf; |
e1c6ee83 | 39 | fpos_t pos; |
ba1ffaa1 | 40 | struct spwd *result; |
22d57dd3 UD |
41 | int save; |
42 | ||
e1c6ee83 UD |
43 | if (fgetpos (stream, &pos) != 0) |
44 | return NULL; | |
45 | ||
22d57dd3 UD |
46 | /* Get lock. */ |
47 | __libc_lock_lock (lock); | |
48 | ||
49 | /* Allocate buffer if not yet available. */ | |
50 | if (buffer == NULL) | |
51 | { | |
52 | buffer_size = BUFLEN_SPWD; | |
53 | buffer = malloc (buffer_size); | |
54 | } | |
55 | ||
56 | while (buffer != NULL | |
e1c6ee83 UD |
57 | && (__fgetspent_r (stream, &resbuf, buffer, buffer_size, &result) |
58 | == ERANGE)) | |
22d57dd3 UD |
59 | { |
60 | char *new_buf; | |
61 | buffer_size += BUFLEN_SPWD; | |
62 | new_buf = realloc (buffer, buffer_size); | |
63 | if (new_buf == NULL) | |
64 | { | |
65 | /* We are out of memory. Free the current buffer so that the | |
66 | process gets a chance for a normal termination. */ | |
67 | save = errno; | |
68 | free (buffer); | |
69 | __set_errno (save); | |
70 | } | |
71 | buffer = new_buf; | |
e1c6ee83 UD |
72 | |
73 | /* Reset the stream. */ | |
74 | if (fsetpos (stream, &pos) != 0) | |
75 | buffer = NULL; | |
22d57dd3 UD |
76 | } |
77 | ||
78 | if (buffer == NULL) | |
79 | result = NULL; | |
80 | ||
81 | /* Release lock. Preserve error value. */ | |
82 | save = errno; | |
83 | __libc_lock_unlock (lock); | |
84 | __set_errno (save); | |
267ca16a | 85 | |
22d57dd3 | 86 | return result; |
267ca16a | 87 | } |