1 /* Copyright (C) 1996-2021 Free Software Foundation, Inc.
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
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.
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
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include "nsswitch.h"
19
20 /*******************************************************************\
21 |* Here we assume one symbol to be defined: *|
22 |* *|
23 |* DATABASE_NAME - name of the database the function accesses *|
24 |* (e.g., hosts, services, ...) *|
25 |* *|
26 |* One additional symbol may optionally be defined: *|
27 |* *|
28 |* ALTERNATE_NAME - name of another service which is examined in *|
29 |* case DATABASE_NAME is not found *|
30 |* *|
31 |* DEFAULT_CONFIG - string for default conf (e.g. "files dns") *|
32 |* *|
33 \*******************************************************************/
34
35 #define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2)
36 #define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
37 #define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
38
39 #define DATABASE_NAME_ID CONCAT2_1 (nss_database_, DATABASE_NAME)
40 #define CONCAT2_1(Pre, Name) CONCAT2_2 (Pre, Name)
41 #define CONCAT2_2(Pre, Name) Pre##Name
42
43 #define DATABASE_NAME_SYMBOL CONCAT3_1 (__nss_, DATABASE_NAME, _database)
44 #define DATABASE_NAME_STRING STRINGIFY1 (DATABASE_NAME)
45 #define STRINGIFY1(Name) STRINGIFY2 (Name)
46 #define STRINGIFY2(Name) #Name
47
48 int
DB_LOOKUP_FCT(nss_action_list * ni,const char * fct_name,const char * fct2_name,void ** fctp)49 DB_LOOKUP_FCT (nss_action_list *ni, const char *fct_name, const char *fct2_name,
50 void **fctp)
51 {
52 if (! __nss_database_get (DATABASE_NAME_ID, &DATABASE_NAME_SYMBOL))
53 return -1;
54
55 *ni = DATABASE_NAME_SYMBOL;
56
57 return __nss_lookup (ni, fct_name, fct2_name, fctp);
58 }
59 libc_hidden_def (DB_LOOKUP_FCT)
60