blob: 697e1189772bb1c01610edeae3365a9bea85090a [file] [log] [blame]
/* Copyright (C) 1996-2014 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
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, see
<>. */
#include <errno.h>
#include <bits/libc-lock.h>
#include <shadow.h>
#include <stdio.h>
#include <stdlib.h>
/* A reasonable size for a buffer to start with. */
#define BUFLEN_SPWD 1024
/* We need to protect the dynamic buffer handling. */
__libc_lock_define_initialized (static, lock);
libc_freeres_ptr (static char *buffer);
/* Read one shadow entry from the given stream. */
struct spwd *
fgetspent (FILE *stream)
static size_t buffer_size;
static struct spwd resbuf;
fpos_t pos;
struct spwd *result;
int save;
if (fgetpos (stream, &pos) != 0)
return NULL;
/* Get lock. */
__libc_lock_lock (lock);
/* Allocate buffer if not yet available. */
if (buffer == NULL)
buffer_size = BUFLEN_SPWD;
buffer = malloc (buffer_size);
while (buffer != NULL
&& (__fgetspent_r (stream, &resbuf, buffer, buffer_size, &result)
char *new_buf;
buffer_size += BUFLEN_SPWD;
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;
/* 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;