shadow/sgetspent.c

   1 /* Copyright (C) 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <shadow.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24
  25 #define MAX(a, b) ((a) > (b) ? (a) : (b))
  26
  27 /* Read one shadow entry from the given stream.  */
  28 struct spwd *
  29 sgetspent (const char *string)
  30 {
  31   static struct spwd resbuf;
  32   static int max_size = 0;
  33   static char *buffer = NULL;
  34   struct spwd *result;
  35   int len;
  36
  37   len = strlen (string) + 1;
  38   if (len > max_size)
  39     {
  40       max_size = MAX (128, len + 32);
  41       buffer = realloc (buffer, max_size);
  42       if (buffer == NULL)
  43         return NULL;
  44     }
  45
  46   return __sgetspent_r (string, &resbuf, buffer, max_size, &result)
  47     ? NULL : result;
  48 }