nss/XXX-lookup.c

   1 /* Copyright (C) 1996 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
  17 not, 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, servicess, ...)                   *|
  27 |*                                                                 *|
  28 |* One additional symbol may optionally be defined:                *|
  29 |*                                                                 *|
  30 |* DEFAULT_CONFIG - string for default conf (e.g. "dns files")     *|
  31 |*                                                                 *|
  32 \*******************************************************************/
  33
  34 #define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
  35 #define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
  36 #define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
  37
  38 #define DATABASE_NAME_SYMBOL CONCAT3_1 (__nss_, DATABASE_NAME, _database)
  39 #define DATABASE_NAME_STRING STRINGIFY1 (DATABASE_NAME)
  40 #define STRINGIFY1(Name) STRINGIFY2 (Name)
  41 #define STRINGIFY2(Name) #Name
  42
  43 #ifndef DEFAULT_CONFIG
  44 #define DEFAULT_CONFIG NULL
  45 #endif
  46
  47 service_user *DATABASE_NAME_SYMBOL = NULL;
  48
  49 int
  50 DB_LOOKUP_FCT (service_user **ni, const char *fct_name, void **fctp)
  51 {
  52   if (DATABASE_NAME_SYMBOL == NULL
  53       && __nss_database_lookup (DATABASE_NAME_STRING, DEFAULT_CONFIG,
  54                                 &DATABASE_NAME_SYMBOL) < 0)
  55     return -1;
  56
  57   *ni = DATABASE_NAME_SYMBOL;
  58
  59   return __nss_lookup (ni, fct_name, fctp);
  60 }