nss/XXX-lookup.c

   1 /* Copyright (C) 1996, 1997, 1999, 2000, 2002, 2007 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    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, _lookup2)
  38 #define DB_COMPAT_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
  39 #define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
  40 #define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
  41
  42 #define DATABASE_NAME_SYMBOL CONCAT3_1 (__nss_, DATABASE_NAME, _database)
  43 #define DATABASE_NAME_STRING STRINGIFY1 (DATABASE_NAME)
  44 #define STRINGIFY1(Name) STRINGIFY2 (Name)
  45 #define STRINGIFY2(Name) #Name
  46
  47 #ifdef ALTERNATE_NAME
  48 #define ALTERNATE_NAME_STRING STRINGIFY1 (ALTERNATE_NAME)
  49 #else
  50 #define ALTERNATE_NAME_STRING NULL
  51 #endif
  52
  53 #ifndef DEFAULT_CONFIG
  54 #define DEFAULT_CONFIG NULL
  55 #endif
  56
  57 service_user *DATABASE_NAME_SYMBOL attribute_hidden;
  58
  59 extern int DB_LOOKUP_FCT (service_user **ni, const char *fct_name,
  60                           const char *fct2_name, void **fctp)
  61   internal_function;
  62 libc_hidden_proto (DB_LOOKUP_FCT)
  63
  64 int
  65 internal_function
  66 DB_LOOKUP_FCT (service_user **ni, const char *fct_name, const char *fct2_name,
  67                void **fctp)
  68 {
  69   if (DATABASE_NAME_SYMBOL == NULL
  70       && __nss_database_lookup (DATABASE_NAME_STRING, ALTERNATE_NAME_STRING,
  71                                 DEFAULT_CONFIG, &DATABASE_NAME_SYMBOL) < 0)
  72     return -1;
  73
  74   *ni = DATABASE_NAME_SYMBOL;
  75
  76   return __nss_lookup (ni, fct_name, fct2_name, fctp);
  77 }
  78 libc_hidden_def (DB_LOOKUP_FCT)
  79
  80
  81 #ifndef NO_COMPAT
  82 int
  83 internal_function attribute_compat_text_section
  84 DB_COMPAT_FCT (service_user **ni, const char *fct_name, void **fctp)
  85 {
  86   return DB_LOOKUP_FCT (ni, fct_name, NULL, fctp);
  87 }
  88 #endif