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2b778ceb | 1 | /* Copyright (C) 2000-2021 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 | |
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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. | |
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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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
55f44129 | 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/>. */ |
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17 | |
18 | #include <errno.h> | |
19 | #include <stdlib.h> | |
20 | #include <netdb.h> | |
21 | #include "nsswitch.h" | |
22 | ||
23 | void * | |
24 | __nss_getent (getent_r_function func, void **resbuf, char **buffer, | |
25 | size_t buflen, size_t *buffer_size, int *h_errnop) | |
26 | { | |
27 | void *result; | |
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28 | |
29 | if (*buffer == NULL) | |
30 | { | |
31 | *buffer_size = buflen; | |
32 | *buffer = malloc (*buffer_size); | |
33 | } | |
34 | ||
6a9b9c02 | 35 | while (*buffer != NULL |
1d5c2feb | 36 | && func (resbuf, *buffer, *buffer_size, &result, h_errnop) == ERANGE |
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37 | && (h_errnop == NULL || *h_errnop == NETDB_INTERNAL)) |
38 | { | |
39 | char *new_buf; | |
e1b27ffb | 40 | *buffer_size *= 2; |
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41 | new_buf = realloc (*buffer, *buffer_size); |
42 | if (new_buf == NULL) | |
43 | { | |
44 | /* We are out of memory. Free the current buffer so that the | |
45 | process gets a chance for a normal termination. */ | |
1d5c2feb | 46 | int save = errno; |
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47 | free (*buffer); |
48 | __set_errno (save); | |
49 | } | |
50 | *buffer = new_buf; | |
51 | } | |
52 | ||
53 | if (*buffer == NULL) | |
54 | result = NULL; | |
55 | ||
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56 | return result; |
57 | } |