nss/getXXbyYY.c

   1 /* Copyright (C) 1996 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 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.
   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 Library General Public License for more details.
  13
  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
  16 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 Boston, MA 02111-1307, USA.  */
  18
  19 #include "../nss/nsswitch.h"
  20
  21 /*******************************************************************\
  22 |* Here we assume several symbols to be defined:                   *|
  23 |*                                                                 *|
  24 |* LOOKUP_TYPE   - the return type of the function                 *|
  25 |*                                                                 *|
  26 |* FUNCTION_NAME - name of the non-reentrant function              *|
  27 |*                                                                 *|
  28 |* DATABASE_NAME - name of the database the function accesses      *|
  29 |*                 (e.g., host, services, ...)                     *|
  30 |*                                                                 *|
  31 |* ADD_PARAMS    - additional parameter, can vary in number        *|
  32 |*                                                                 *|
  33 |* ADD_VARIABLES - names of additional parameter                   *|
  34 |*                                                                 *|
  35 |* BUFLEN        - length of buffer allocated for the non          *|
  36 |*                 reentrant version                               *|
  37 |*                                                                 *|
  38 |* Optionally the following vars can be defined:                   *|
  39 |*                                                                 *|
  40 |* NEED_H_ERRNO  - an extra parameter will be passed to point to   *|
  41 |*                 the global `h_errno' variable.                  *|
  42 |*                                                                 *|
  43 \*******************************************************************/
  44
  45 /* To make the real sources a bit prettier.  */
  46 #define REENTRANT_NAME APPEND_R (FUNCTION_NAME)
  47 #define APPEND_R(name) APPEND_R1 (name)
  48 #define APPEND_R1(name) name##_r
  49
  50 /* Sometimes we need to store error codes in the `h_errno' variable.  */
  51 #ifdef NEED_H_ERRNO
  52 # define H_ERRNO_PARM , int *h_errnop
  53 # define H_ERRNO_VAR , &h_errno
  54 #else
  55 # define H_ERRNO_PARM
  56 # define H_ERRNO_VAR
  57 #endif
  58
  59
  60 /* Prototype for reentrant version we use here.  */
  61 extern LOOKUP_TYPE *REENTRANT_NAME (ADD_PARAMS, LOOKUP_TYPE *result,
  62                                     char *buffer, int buflen H_ERRNO_PARM);
  63
  64 LOOKUP_TYPE *
  65 FUNCTION_NAME (ADD_PARAMS)
  66 {
  67   static LOOKUP_TYPE result;
  68   static char buffer[BUFLEN];
  69
  70   return REENTRANT_NAME (ADD_VARIABLES, &result, buffer, BUFLEN H_ERRNO_VAR);
  71 }