(dl-routines, elide-routines.os, rtld-routines): Undo last change.
[glibc.git] / nss / getXXbyYY.c
blob0df916b1edea1a5e38f2bad70c4c736dbec0dcda
1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
19 #include <errno.h>
20 #include <bits/libc-lock.h>
21 #include <stdlib.h>
23 #include "nsswitch.h"
25 /*******************************************************************\
26 |* Here we assume several symbols to be defined: *|
27 |* *|
28 |* LOOKUP_TYPE - the return type of the function *|
29 |* *|
30 |* FUNCTION_NAME - name of the non-reentrant function *|
31 |* *|
32 |* DATABASE_NAME - name of the database the function accesses *|
33 |* (e.g., host, services, ...) *|
34 |* *|
35 |* ADD_PARAMS - additional parameter, can vary in number *|
36 |* *|
37 |* ADD_VARIABLES - names of additional parameter *|
38 |* *|
39 |* BUFLEN - length of buffer allocated for the non *|
40 |* reentrant version *|
41 |* *|
42 |* Optionally the following vars can be defined: *|
43 |* *|
44 |* NEED_H_ERRNO - an extra parameter will be passed to point to *|
45 |* the global `h_errno' variable. *|
46 |* *|
47 \*******************************************************************/
49 /* To make the real sources a bit prettier. */
50 #define REENTRANT_NAME APPEND_R (FUNCTION_NAME)
51 #define APPEND_R(name) APPEND_R1 (name)
52 #define APPEND_R1(name) name##_r
53 #define INTERNAL(name) INTERNAL1 (name)
54 #define INTERNAL1(name) __##name
56 /* Sometimes we need to store error codes in the `h_errno' variable. */
57 #ifdef NEED_H_ERRNO
58 # define H_ERRNO_PARM , int *h_errnop
59 # define H_ERRNO_VAR , &h_errno_tmp
60 #else
61 # define H_ERRNO_PARM
62 # define H_ERRNO_VAR
63 #endif
66 /* Prototype for reentrant version we use here. */
67 extern int INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf,
68 char *buffer, size_t buflen,
69 LOOKUP_TYPE **result H_ERRNO_PARM);
71 /* We need to protect the dynamic buffer handling. */
72 __libc_lock_define_initialized (static, lock);
75 LOOKUP_TYPE *
76 FUNCTION_NAME (ADD_PARAMS)
78 static char *buffer;
79 static size_t buffer_size;
80 static LOOKUP_TYPE resbuf;
81 LOOKUP_TYPE *result;
82 int save;
83 #ifdef NEED_H_ERRNO
84 int h_errno_tmp = 0;
85 #endif
87 /* Get lock. */
88 __libc_lock_lock (lock);
90 if (buffer == NULL)
92 buffer_size = BUFLEN;
93 buffer = malloc (buffer_size);
96 if (buffer != NULL)
98 #ifdef HANDLE_DIGITS_DOTS
99 # include "digits_dots.c"
100 #endif
103 while (buffer != NULL
104 && INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer,
105 buffer_size, &result H_ERRNO_VAR) != 0
106 #ifdef NEED_H_ERRNO
107 && h_errno_tmp == NETDB_INTERNAL
108 #endif
109 && errno == ERANGE)
111 char *new_buf;
112 buffer_size += BUFLEN;
113 new_buf = realloc (buffer, buffer_size);
114 if (new_buf == NULL)
116 /* We are out of memory. Free the current buffer so that the
117 process gets a chance for a normal termination. */
118 save = errno;
119 free (buffer);
120 buffer = NULL;
121 __set_errno (save);
123 buffer = new_buf;
126 if (buffer == NULL)
127 result = NULL;
129 #ifdef HANDLE_DIGITS_DOTS
130 done:
131 #endif
132 /* Release lock. Preserve error value. */
133 save = errno;
134 __libc_lock_unlock (lock);
135 __set_errno (save);
137 #ifdef NEED_H_ERRNO
138 if (h_errno_tmp != 0)
139 __set_h_errno (h_errno_tmp);
140 #endif
142 return result;