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calloc.c

/* calloc() function that is glibc compatible.
   This wrapper function is required at least on Tru64 UNIX 5.1 and mingw.
   Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* written by Jim Meyering and Bruno Haible */

#include <config.h>
/* Only the AC_FUNC_CALLOC macro defines 'calloc' already in config.h.  */
#ifdef calloc
# define NEED_CALLOC_GNU
# undef calloc
#endif

/* Specification.  */
#include <stdlib.h>

#include <errno.h>

/* Call the system's calloc below.  */
#undef calloc

/* Allocate and zero-fill an NxS-byte block of memory from the heap.
   If N or S is zero, allocate and zero-fill a 1-byte block.  */

void *
rpl_calloc (size_t n, size_t s)
{
  void *result;

#ifdef NEED_CALLOC_GNU
  if (n == 0 || s == 0)
    {
      n = 1;
      s = 1;
    }
  else
    {
      /* Defend against buggy calloc implementations that mishandle
       size_t overflow.  */
      size_t bytes = n * s;
      if (bytes / s != n)
      {
        errno = ENOMEM;
        return NULL;
      }
    }
#endif

  result = calloc (n, s);

#if !HAVE_CALLOC_POSIX
  if (result == NULL)
    errno = ENOMEM;
#endif

  return result;
}

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