glibc/grp/fgetgrent.c
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

96 lines
2.4 KiB
C

/* Copyright (C) 1991, 1996, 1997, 1999, 2000 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <grp.h>
#include <bits/libc-lock.h>
#include <stdio.h>
#include <stdlib.h>
/* We need to protect the dynamic buffer handling. */
__libc_lock_define_initialized (static, lock);
static char *buffer;
/* Read one entry from the given stream. */
struct group *
fgetgrent (FILE *stream)
{
static size_t buffer_size;
static struct group resbuf;
fpos_t pos;
struct group *result;
int save;
if (__builtin_expect (fgetpos (stream, &pos), 0) != 0)
return NULL;
/* Get lock. */
__libc_lock_lock (lock);
/* Allocate buffer if not yet available. */
if (buffer == NULL)
{
buffer_size = NSS_BUFLEN_GROUP;
buffer = malloc (buffer_size);
}
while (buffer != NULL
&& (__fgetgrent_r (stream, &resbuf, buffer, buffer_size, &result)
== ERANGE))
{
char *new_buf;
buffer_size += NSS_BUFLEN_GROUP;
new_buf = realloc (buffer, buffer_size);
if (__builtin_expect (new_buf == NULL, 0))
{
/* 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;
/* Reset the stream. */
if (fsetpos (stream, &pos) != 0)
buffer = NULL;
}
if (buffer == NULL)
result = NULL;
/* Release lock. Preserve error value. */
save = errno;
__libc_lock_unlock (lock);
__set_errno (save);
return result;
}
/* Free all resources if necessary. */
static void __attribute__ ((unused))
free_mem (void)
{
free (buffer);
}
text_set_element (__libc_subfreeres, free_mem);