lib/calloc.c

   1 /* calloc() function that is glibc compatible.
   2    This wrapper function is required at least on Tru64 UNIX 5.1 and mingw.
   3    Copyright (C) 2004-2007, 2009-2024 Free Software Foundation, Inc.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    This file is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* written by Jim Meyering and Bruno Haible */
  19
  20 #include <config.h>
  21
  22 /* Specification.  */
  23 #include <stdlib.h>
  24
  25 #include <errno.h>
  26
  27 #include "xalloc-oversized.h"
  28
  29 /* Call the system's calloc below.  */
  30 #undef calloc
  31
  32 /* Allocate and zero-fill an NxS-byte block of memory from the heap,
  33    even if N or S is zero.  */
  34
  35 void *
  36 rpl_calloc (size_t n, size_t s)
  37 {
  38   if (n == 0 || s == 0)
  39     n = s = 1;
  40
  41   if (xalloc_oversized (n, s))
  42     {
  43       errno = ENOMEM;
  44       return NULL;
  45     }
  46
  47   void *result = calloc (n, s);
  48
  49 #if !HAVE_MALLOC_POSIX
  50   if (result == NULL)
  51     errno = ENOMEM;
  52 #endif
  53
  54   return result;
  55 }