116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 not,
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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 <errno.h>
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#include <bits/libc-lock.h>
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#include <stdlib.h>
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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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|* GETFUNC_NAME - name of the non-reentrant getXXXent function *|
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|* *|
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|* BUFLEN - size of static buffer *|
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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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\*******************************************************************/
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/* To make the real sources a bit prettier. */
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#define REENTRANT_GETNAME APPEND_R (GETFUNC_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 INTERNAL(name) INTERNAL1 (name)
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#define INTERNAL1(name) __##name
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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_errno
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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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/* Prototype of the reentrant version. */
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extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer,
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size_t buflen, LOOKUP_TYPE **result
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H_ERRNO_PARM);
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/* We need to protect the dynamic buffer handling. */
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__libc_lock_define_initialized (static, lock);
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LOOKUP_TYPE *
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GETFUNC_NAME (void)
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{
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static char *buffer;
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static size_t buffer_size;
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static LOOKUP_TYPE resbuf;
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LOOKUP_TYPE *result;
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int save;
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/* Get lock. */
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__libc_lock_lock (lock);
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if (buffer == NULL)
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{
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buffer_size = BUFLEN;
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buffer = malloc (buffer_size);
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}
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while (buffer != NULL
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&& INTERNAL (REENTRANT_GETNAME) (&resbuf, buffer, buffer_size, &result
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H_ERRNO_VAR) != 0
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#ifdef NEED_H_ERRNO
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&& h_errno == NETDB_INTERNAL
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#endif
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&& errno == ERANGE)
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{
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char *new_buf;
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buffer_size += BUFLEN;
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new_buf = realloc (buffer, buffer_size);
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if (new_buf == NULL)
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{
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/* We are out of memory. Free the current buffer so that the
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process gets a chance for a normal termination. */
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save = errno;
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free (buffer);
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__set_errno (save);
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}
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buffer = new_buf;
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}
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if (buffer == NULL)
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result = NULL;
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/* Release lock. Preserve error value. */
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save = errno;
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__libc_lock_unlock (lock);
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__set_errno (save);
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return result;
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}
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