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22d57dd3 | 1 | /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
26761c28 | 2 | This file is part of the GNU C Library. |
5f0e6fc7 | 3 | |
26761c28 UD |
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. | |
5f0e6fc7 | 8 | |
26761c28 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 | |
12 | Library General Public License for more details. | |
5f0e6fc7 | 13 | |
26761c28 UD |
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. */ | |
18 | ||
19 | #include <errno.h> | |
5107cf1d | 20 | #include <bits/libc-lock.h> |
26761c28 | 21 | #include <stdlib.h> |
5f0e6fc7 RM |
22 | |
23 | #include "nsswitch.h" | |
24 | ||
25 | /*******************************************************************\ | |
26 | |* Here we assume several symbols to be defined: *| | |
27 | |* *| | |
28 | |* LOOKUP_TYPE - the return type of the function *| | |
29 | |* *| | |
30 | |* GETFUNC_NAME - name of the non-reentrant getXXXent function *| | |
31 | |* *| | |
32 | |* BUFLEN - size of static buffer *| | |
33 | |* *| | |
34 | |* Optionally the following vars can be defined: *| | |
35 | |* *| | |
36 | |* NEED_H_ERRNO - an extra parameter will be passed to point to *| | |
37 | |* the global `h_errno' variable. *| | |
38 | |* *| | |
39 | \*******************************************************************/ | |
40 | ||
41 | /* To make the real sources a bit prettier. */ | |
42 | #define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME) | |
43 | #define APPEND_R(name) APPEND_R1 (name) | |
44 | #define APPEND_R1(name) name##_r | |
23396375 UD |
45 | #define INTERNAL(name) INTERNAL1 (name) |
46 | #define INTERNAL1(name) __##name | |
5f0e6fc7 RM |
47 | |
48 | /* Sometimes we need to store error codes in the `h_errno' variable. */ | |
49 | #ifdef NEED_H_ERRNO | |
50 | # define H_ERRNO_PARM , int *h_errnop | |
51 | # define H_ERRNO_VAR , &h_errno | |
52 | #else | |
53 | # define H_ERRNO_PARM | |
54 | # define H_ERRNO_VAR | |
55 | #endif | |
56 | ||
57 | /* Prototype of the reentrant version. */ | |
ba1ffaa1 UD |
58 | extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, |
59 | size_t buflen, LOOKUP_TYPE **result | |
60 | H_ERRNO_PARM); | |
5f0e6fc7 | 61 | |
26761c28 UD |
62 | /* We need to protect the dynamic buffer handling. */ |
63 | __libc_lock_define_initialized (static, lock); | |
64 | ||
5f0e6fc7 RM |
65 | |
66 | LOOKUP_TYPE * | |
67 | GETFUNC_NAME (void) | |
68 | { | |
26761c28 UD |
69 | static char *buffer; |
70 | static size_t buffer_size; | |
ba1ffaa1 | 71 | static LOOKUP_TYPE resbuf; |
22d57dd3 | 72 | LOOKUP_TYPE *result; |
26761c28 UD |
73 | int save; |
74 | ||
75 | /* Get lock. */ | |
76 | __libc_lock_lock (lock); | |
77 | ||
78 | if (buffer == NULL) | |
79 | { | |
80 | buffer_size = BUFLEN; | |
81 | buffer = malloc (buffer_size); | |
82 | } | |
83 | ||
84 | while (buffer != NULL | |
85 | && INTERNAL (REENTRANT_GETNAME) (&resbuf, buffer, buffer_size, &result | |
86 | H_ERRNO_VAR) != 0 | |
e4cf5070 UD |
87 | #ifdef NEED_H_ERRNO |
88 | && h_errno == NETDB_INTERNAL | |
89 | #endif | |
26761c28 UD |
90 | && errno == ERANGE) |
91 | { | |
92 | char *new_buf; | |
93 | buffer_size += BUFLEN; | |
94 | new_buf = realloc (buffer, buffer_size); | |
95 | if (new_buf == NULL) | |
e4cf5070 UD |
96 | { |
97 | /* We are out of memory. Free the current buffer so that the | |
98 | process gets a chance for a normal termination. */ | |
99 | save = errno; | |
100 | free (buffer); | |
101 | __set_errno (save); | |
102 | } | |
26761c28 UD |
103 | buffer = new_buf; |
104 | } | |
5f0e6fc7 | 105 | |
22d57dd3 UD |
106 | if (buffer == NULL) |
107 | result = NULL; | |
108 | ||
26761c28 UD |
109 | /* Release lock. Preserve error value. */ |
110 | save = errno; | |
111 | __libc_lock_unlock (lock); | |
112 | __set_errno (save); | |
ba1ffaa1 UD |
113 | |
114 | return result; | |
5f0e6fc7 | 115 | } |