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bfff8b1b | 1 | /* Copyright (C) 2009-2017 Free Software Foundation, Inc. |
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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 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. | |
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 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
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15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
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17 | |
18 | #include <errno.h> | |
ec999b8e | 19 | #include <libc-lock.h> |
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20 | #include <gshadow.h> |
21 | #include <stdlib.h> | |
22 | ||
23 | ||
24 | /* A reasonable size for a buffer to start with. */ | |
25 | #define BUFLEN_SPWD 1024 | |
26 | ||
27 | /* We need to protect the dynamic buffer handling. */ | |
28 | __libc_lock_define_initialized (static, lock); | |
29 | ||
30 | /* Read one shadow entry from the given stream. */ | |
31 | struct sgrp * | |
32 | sgetsgent (const char *string) | |
33 | { | |
34 | static char *buffer; | |
35 | static size_t buffer_size; | |
36 | static struct sgrp resbuf; | |
37 | struct sgrp *result; | |
38 | int save; | |
39 | ||
40 | /* Get lock. */ | |
41 | __libc_lock_lock (lock); | |
42 | ||
43 | /* Allocate buffer if not yet available. */ | |
44 | if (buffer == NULL) | |
45 | { | |
46 | buffer_size = BUFLEN_SPWD; | |
47 | buffer = malloc (buffer_size); | |
48 | } | |
49 | ||
50 | while (buffer != NULL | |
51 | && __sgetsgent_r (string, &resbuf, buffer, buffer_size, &result) != 0 | |
52 | && errno == ERANGE) | |
53 | { | |
54 | char *new_buf; | |
55 | buffer_size += BUFLEN_SPWD; | |
56 | new_buf = realloc (buffer, buffer_size); | |
57 | if (new_buf == NULL) | |
58 | { | |
59 | /* We are out of memory. Free the current buffer so that the | |
60 | process gets a chance for a normal termination. */ | |
61 | save = errno; | |
62 | free (buffer); | |
63 | __set_errno (save); | |
64 | } | |
65 | buffer = new_buf; | |
66 | } | |
67 | ||
68 | if (buffer == NULL) | |
69 | result = NULL; | |
70 | ||
71 | /* Release lock. Preserve error value. */ | |
72 | save = errno; | |
73 | __libc_lock_unlock (lock); | |
74 | __set_errno (save); | |
75 | ||
76 | return result; | |
77 | } |