130 lines
4.1 KiB
C
130 lines
4.1 KiB
C
/* Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "nsswitch.h"
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/*******************************************************************\
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|* Here we assume several symbols to be defined: *|
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|* *|
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|* LOOKUP_TYPE - the return type of the function *|
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|* *|
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|* FUNCTION_NAME - name of the non-reentrant function *|
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|* *|
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|* DATABASE_NAME - name of the database the function accesses *|
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|* (e.g., host, services, ...) *|
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|* *|
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|* ADD_PARAMS - additional parameter, can vary in number *|
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|* *|
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|* ADD_VARIABLES - names of additional parameter *|
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|* *|
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|* Optionally the following vars can be defined: *|
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|* *|
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|* NEED_H_ERRNO - an extra parameter will be passed to point to *|
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|* the global `h_errno' variable. *|
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|* *|
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|* NEED__RES - the global _res variable might be used so we *|
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|* will have to initialize it if necessary *|
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|* *|
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\*******************************************************************/
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/* To make the real sources a bit prettier. */
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#define REENTRANT_NAME APPEND_R (FUNCTION_NAME)
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#define APPEND_R(name) APPEND_R1 (name)
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#define APPEND_R1(name) name##_r
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#define FUNCTION_NAME_STRING STRINGIZE (FUNCTION_NAME)
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#define REENTRANT_NAME_STRING STRINGIZE (REENTRANT_NAME)
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#define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME)
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#define STRINGIZE(name) STRINGIZE1 (name)
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#define STRINGIZE1(name) #name
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#define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
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#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
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#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
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/* Sometimes we need to store error codes in the `h_errno' variable. */
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#ifdef NEED_H_ERRNO
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# define H_ERRNO_PARM , int *h_errnop
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# define H_ERRNO_VAR , h_errnop
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#else
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# define H_ERRNO_PARM
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# define H_ERRNO_VAR
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#endif
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/* Type of the lookup function we need here. */
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typedef int (*lookup_function) (ADD_PARAMS, LOOKUP_TYPE *, char *, int
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H_ERRNO_PARM);
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/* Some usages of this file might use this variable. */
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extern struct __res_state _res;
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/* The lookup function for the first entry of this service. */
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extern int DB_LOOKUP_FCT (service_user **nip, const char *name, void **fctp);
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LOOKUP_TYPE *
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REENTRANT_NAME (ADD_PARAMS, LOOKUP_TYPE *result, char *buffer, int buflen
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H_ERRNO_PARM)
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{
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static service_user *startp = NULL;
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static lookup_function start_fct;
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service_user *nip;
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lookup_function fct;
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int no_more;
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enum nss_status status = NSS_STATUS_UNAVAIL;
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if (startp == NULL)
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{
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no_more = DB_LOOKUP_FCT (&nip, REENTRANT_NAME_STRING, (void **) &fct);
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if (no_more)
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startp = (service_user *) -1;
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else
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{
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startp = nip;
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start_fct = fct;
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#ifdef NEED__RES
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/* The resolver code will really be used so we have to
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initialize it. */
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if ((_res.options & RES_INIT) == 0 && res_init () == -1)
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{
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h_errno = NETDB_INTERNAL;
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return NULL;
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}
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#endif /* need _res */
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}
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}
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else
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{
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fct = start_fct;
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no_more = (nip = startp) == (service_user *) -1;
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}
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while (no_more == 0)
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{
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status = (*fct) (ADD_VARIABLES, result, buffer, buflen H_ERRNO_VAR);
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no_more = __nss_next (&nip, REENTRANT_NAME_STRING, &fct, status, 0);
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}
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return status == NSS_STATUS_SUCCESS ? result : NULL;
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}
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