Update.
[glibc.git] / nss / getXXent.c
blob0c8bcb4d4da7a141c4b9fb96f9e95d38fbf8ccf8
1 /* Copyright (C) 1996, 1997, 1999, 2000 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 |* 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 \*******************************************************************/
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
45 #define INTERNAL(name) INTERNAL1 (name)
46 #define INTERNAL1(name) __##name
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 NULL
55 #endif
57 /* Prototype of the reentrant version. */
58 extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer,
59 size_t buflen, LOOKUP_TYPE **result
60 H_ERRNO_PARM);
62 /* We need to protect the dynamic buffer handling. */
63 __libc_lock_define_initialized (static, lock);
65 /* This points to the static buffer used. */
66 static char *buffer;
69 LOOKUP_TYPE *
70 GETFUNC_NAME (void)
72 static size_t buffer_size;
73 static LOOKUP_TYPE resbuf;
74 LOOKUP_TYPE *result;
75 int save;
77 /* Get lock. */
78 __libc_lock_lock (lock);
80 result = (LOOKUP_TYPE *)
81 __nss_getent ((getent_r_function) INTERNAL (REENTRANT_GETNAME),
82 (void **) &resbuf, &buffer, BUFLEN, &buffer_size,
83 H_ERRNO_VAR);
85 save = errno;
86 __libc_lock_unlock (lock);
87 __set_errno (save);
88 return result;
92 /* Free all resources if necessary. */
93 static void __attribute__ ((unused))
94 free_mem (void)
96 free (buffer);
99 text_set_element (__libc_subfreeres, free_mem);