| /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "nsswitch.h" |
| |
| /*******************************************************************\ |
| |* Here we assume several symbols to be defined: *| |
| |* *| |
| |* LOOKUP_TYPE - the return type of the function *| |
| |* *| |
| |* FUNCTION_NAME - name of the non-reentrant function *| |
| |* *| |
| |* DATABASE_NAME - name of the database the function accesses *| |
| |* (e.g., host, services, ...) *| |
| |* *| |
| |* ADD_PARAMS - additional parameter, can vary in number *| |
| |* *| |
| |* ADD_VARIABLES - names of additional parameter *| |
| |* *| |
| |* Optionally the following vars can be defined: *| |
| |* *| |
| |* NEED_H_ERRNO - an extra parameter will be passed to point to *| |
| |* the global `h_errno' variable. *| |
| |* *| |
| |* NEED__RES - the global _res variable might be used so we *| |
| |* will have to initialize it if necessary *| |
| |* *| |
| \*******************************************************************/ |
| |
| /* To make the real sources a bit prettier. */ |
| #define REENTRANT_NAME APPEND_R (FUNCTION_NAME) |
| #define APPEND_R(name) APPEND_R1 (name) |
| #define APPEND_R1(name) name##_r |
| #define INTERNAL(name) INTERNAL1 (name) |
| #define INTERNAL1(name) __##name |
| |
| #define FUNCTION_NAME_STRING STRINGIZE (FUNCTION_NAME) |
| #define REENTRANT_NAME_STRING STRINGIZE (REENTRANT_NAME) |
| #define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME) |
| #define STRINGIZE(name) STRINGIZE1 (name) |
| #define STRINGIZE1(name) #name |
| |
| #define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup) |
| #define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post) |
| #define CONCAT3_2(Pre, Name, Post) Pre##Name##Post |
| |
| /* Sometimes we need to store error codes in the `h_errno' variable. */ |
| #ifdef NEED_H_ERRNO |
| # define H_ERRNO_PARM , int *h_errnop |
| # define H_ERRNO_VAR , h_errnop |
| #else |
| # define H_ERRNO_PARM |
| # define H_ERRNO_VAR |
| #endif |
| |
| |
| /* Type of the lookup function we need here. */ |
| typedef int (*lookup_function) (ADD_PARAMS, LOOKUP_TYPE *, char *, size_t |
| H_ERRNO_PARM); |
| |
| /* Some usages of this file might use this variable. */ |
| extern struct __res_state _res; |
| |
| /* The lookup function for the first entry of this service. */ |
| extern int DB_LOOKUP_FCT (service_user **nip, const char *name, void **fctp); |
| |
| |
| |
| int |
| INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, char *buffer, |
| size_t buflen, LOOKUP_TYPE **result H_ERRNO_PARM) |
| { |
| static service_user *startp = NULL; |
| static lookup_function start_fct; |
| service_user *nip; |
| lookup_function fct; |
| int no_more; |
| enum nss_status status = NSS_STATUS_UNAVAIL; |
| |
| #ifdef HANDLE_DIGITS_DOTS |
| # include "digits_dots.c" |
| #endif |
| |
| if (startp == NULL) |
| { |
| no_more = DB_LOOKUP_FCT (&nip, REENTRANT_NAME_STRING, (void **) &fct); |
| if (no_more) |
| startp = (service_user *) -1l; |
| else |
| { |
| startp = nip; |
| start_fct = fct; |
| |
| #ifdef NEED__RES |
| /* The resolver code will really be used so we have to |
| initialize it. */ |
| if ((_res.options & RES_INIT) == 0 && res_init () == -1) |
| { |
| *h_errnop = NETDB_INTERNAL; |
| *result = NULL; |
| return -1; |
| } |
| #endif /* need _res */ |
| } |
| } |
| else |
| { |
| fct = start_fct; |
| no_more = (nip = startp) == (service_user *) -1l; |
| } |
| |
| while (no_more == 0) |
| { |
| status = (*fct) (ADD_VARIABLES, resbuf, buffer, buflen H_ERRNO_VAR); |
| |
| no_more = __nss_next (&nip, REENTRANT_NAME_STRING, |
| (void **) &fct, status, 0); |
| } |
| |
| #ifdef HANDLE_DIGITS_DOTS |
| done: |
| #endif |
| *result = status == NSS_STATUS_SUCCESS ? resbuf : NULL; |
| return status == NSS_STATUS_SUCCESS ? 0 : -1; |
| } |
| |
| #define do_weak_alias(n1, n2) weak_alias ((n1), (n2)) |
| do_weak_alias (INTERNAL (REENTRANT_NAME), REENTRANT_NAME) |