diff options
Diffstat (limited to 'nss/getXXbyYY_r.c')
| -rw-r--r-- | nss/getXXbyYY_r.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/nss/getXXbyYY_r.c b/nss/getXXbyYY_r.c new file mode 100644 index 0000000000..42092361be --- /dev/null +++ b/nss/getXXbyYY_r.c @@ -0,0 +1,129 @@ +/* Copyright (C) 1996 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 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 *, int + 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); + + + +LOOKUP_TYPE * +REENTRANT_NAME (ADD_PARAMS, LOOKUP_TYPE *result, char *buffer, int buflen + 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; + + if (startp == NULL) + { + no_more = DB_LOOKUP_FCT (&nip, REENTRANT_NAME_STRING, (void **) &fct); + if (no_more) + startp = (service_user *) -1; + 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_errno = NETDB_INTERNAL; + return NULL; + } +#endif /* need _res */ + } + } + else + { + fct = start_fct; + no_more = (nip = startp) == (service_user *) -1; + } + + while (no_more == 0) + { + status = (*fct) (ADD_VARIABLES, result, buffer, buflen H_ERRNO_VAR); + + no_more = __nss_next (&nip, REENTRANT_NAME_STRING, &fct, status, 0); + } + + return status == NSS_STATUS_SUCCESS ? result : NULL; +} |