Optimize a bit by using mempcpy.
[kopensolaris-gnu/glibc.git] / nss / XXX-lookup.c
1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
4
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Library General Public License as
7    published by the Free Software Foundation; either version 2 of the
8    License, or (at your option) any later version.
9
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Library General Public License for more details.
14
15    You should have received a copy of the GNU Library General Public
16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18    Boston, MA 02111-1307, USA.  */
19
20 #include "nsswitch.h"
21
22 /*******************************************************************\
23 |* Here we assume one symbol to be defined:                        *|
24 |*                                                                 *|
25 |* DATABASE_NAME - name of the database the function accesses      *|
26 |*                 (e.g., hosts, services, ...)                    *|
27 |*                                                                 *|
28 |* One additional symbol may optionally be defined:                *|
29 |*                                                                 *|
30 |* ALTERNATE_NAME - name of another service which is examined in   *|
31 |*                  case DATABASE_NAME is not found                *|
32 |*                                                                 *|
33 |* DEFAULT_CONFIG - string for default conf (e.g. "dns files")     *|
34 |*                                                                 *|
35 \*******************************************************************/
36
37 #define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
38 #define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
39 #define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
40
41 #define DATABASE_NAME_SYMBOL CONCAT3_1 (__nss_, DATABASE_NAME, _database)
42 #define DATABASE_NAME_STRING STRINGIFY1 (DATABASE_NAME)
43 #define STRINGIFY1(Name) STRINGIFY2 (Name)
44 #define STRINGIFY2(Name) #Name
45
46 #ifdef ALTERNATE_NAME
47 #define ALTERNATE_NAME_STRING STRINGIFY1 (ALTERNATE_NAME)
48 #else
49 #define ALTERNATE_NAME_STRING NULL
50 #endif
51
52 #ifndef DEFAULT_CONFIG
53 #define DEFAULT_CONFIG NULL
54 #endif
55
56 service_user *DATABASE_NAME_SYMBOL = NULL;
57
58 int
59 DB_LOOKUP_FCT (service_user **ni, const char *fct_name, void **fctp)
60 {
61   if (DATABASE_NAME_SYMBOL == NULL
62       && __nss_database_lookup (DATABASE_NAME_STRING, ALTERNATE_NAME_STRING,
63                                 DEFAULT_CONFIG, &DATABASE_NAME_SYMBOL) < 0)
64     return -1;
65
66   *ni = DATABASE_NAME_SYMBOL;
67
68   return __nss_lookup (ni, fct_name, fctp);
69 }