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[thirdparty/glibc.git] / shadow / sgetspent.c

/* Copyright (C) 1996 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., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <shadow.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#define MAX(a, b) ((a) > (b) ? (a) : (b))

/* Read one shadow entry from the given stream.  */
struct spwd *
sgetspent (const char *string)
{
  static struct spwd resbuf;
  static int max_size = 0;
  static char *buffer = NULL;
  struct spwd *result;
  int len;

  len = strlen (string) + 1;
  if (len > max_size)
    {
      max_size = MAX (128, len + 32);
      buffer = realloc (buffer, max_size);
      if (buffer == NULL)
	return NULL;
    }

  return __sgetspent_r (string, &resbuf, buffer, max_size, &result)
    ? NULL : result;
}