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100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/* Copyright (C) 1991, 1996, 1997, 1999 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 <grp.h>
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#include <bits/libc-lock.h>
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#include <stdio.h>
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#include <stdlib.h>
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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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static char *buffer;
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/* Read one entry from the given stream. */
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struct group *
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fgetgrent (FILE *stream)
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{
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static size_t buffer_size;
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static struct group resbuf;
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fpos_t pos;
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struct group *result;
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int save;
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if (fgetpos (stream, &pos) != 0)
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return NULL;
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/* Get lock. */
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__libc_lock_lock (lock);
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/* Allocate buffer if not yet available. */
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if (buffer == NULL)
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{
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buffer_size = NSS_BUFLEN_GROUP;
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buffer = malloc (buffer_size);
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}
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while (buffer != NULL
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&& __fgetgrent_r (stream, &resbuf, buffer, buffer_size, &result) != 0
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&& errno == ERANGE)
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{
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char *new_buf;
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buffer_size += NSS_BUFLEN_GROUP;
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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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/* Reset the stream. */
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if (fsetpos (stream, &pos) != 0)
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{
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buffer = NULL;
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break;
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}
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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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/* Free all resources if necessary. */
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static void __attribute__ ((unused))
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free_mem (void)
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{
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if (buffer != NULL)
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free (buffer);
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}
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text_set_element (__libc_subfreeres, free_mem);
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