| /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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 <errno.h> |
| #include <libc-lock.h> |
| #include <stdlib.h> |
| |
| #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 *| |
| |* *| |
| |* BUFLEN - length of buffer allocated for the non *| |
| |* reentrant version *| |
| |* *| |
| |* Optionally the following vars can be defined: *| |
| |* *| |
| |* NEED_H_ERRNO - an extra parameter will be passed to point to *| |
| |* the global `h_errno' variable. *| |
| |* *| |
| \*******************************************************************/ |
| |
| /* 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 |
| |
| /* 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_errno_tmp |
| #else |
| # define H_ERRNO_PARM |
| # define H_ERRNO_VAR |
| #endif |
| |
| |
| /* Prototype for reentrant version we use here. */ |
| extern int INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, |
| char *buffer, size_t buflen, |
| LOOKUP_TYPE **result H_ERRNO_PARM); |
| |
| /* We need to protect the dynamic buffer handling. */ |
| __libc_lock_define_initialized (static, lock); |
| |
| |
| LOOKUP_TYPE * |
| FUNCTION_NAME (ADD_PARAMS) |
| { |
| static char *buffer; |
| static size_t buffer_size; |
| static LOOKUP_TYPE resbuf; |
| LOOKUP_TYPE *result; |
| int save; |
| #ifdef NEED_H_ERRNO |
| int h_errno_tmp = 0; |
| #endif |
| |
| /* Get lock. */ |
| __libc_lock_lock (lock); |
| |
| if (buffer == NULL) |
| { |
| buffer_size = BUFLEN; |
| buffer = malloc (buffer_size); |
| } |
| |
| if (buffer != NULL) |
| { |
| #ifdef HANDLE_DIGITS_DOTS |
| # include "digits_dots.c" |
| #endif |
| } |
| |
| while (buffer != NULL |
| && INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer, |
| buffer_size, &result H_ERRNO_VAR) != 0 |
| #ifdef NEED_H_ERRNO |
| && h_errno_tmp == NETDB_INTERNAL |
| #endif |
| && errno == ERANGE) |
| { |
| char *new_buf; |
| buffer_size += BUFLEN; |
| new_buf = realloc (buffer, buffer_size); |
| if (new_buf == NULL) |
| { |
| /* We are out of memory. Free the current buffer so that the |
| process gets a chance for a normal termination. */ |
| save = errno; |
| free (buffer); |
| __set_errno (save); |
| } |
| buffer = new_buf; |
| } |
| |
| if (buffer == NULL) |
| result = NULL; |
| |
| #ifdef HANDLE_DIGITS_DOTS |
| done: |
| #endif |
| /* Release lock. Preserve error value. */ |
| save = errno; |
| __libc_lock_unlock (lock); |
| __set_errno (save); |
| |
| #ifdef NEED_H_ERRNO |
| if (h_errno_tmp != 0) |
| __set_h_errno (h_errno_tmp); |
| #endif |
| |
| return result; |
| } |