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, 2009-2012 Free Software Foundation, Inc. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program 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 General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 /* written by Jim Meyering and Bruno Haible */ 19 20 #include <config.h> 21 /* Only the AC_FUNC_CALLOC macro defines 'calloc' already in config.h. */ 22 #ifdef calloc 23 # define NEED_CALLOC_GNU 1 24 # undef calloc 25 /* Whereas the gnulib module 'calloc-gnu' defines HAVE_CALLOC_GNU. */ 26 #elif GNULIB_CALLOC_GNU && !HAVE_CALLOC_GNU 27 # define NEED_CALLOC_GNU 1 28 #endif 29 30 /* Specification. */ 31 #include <stdlib.h> 32 33 #include <errno.h> 34 35 /* Call the system's calloc below. */ 36 #undef calloc 37 38 /* Allocate and zero-fill an NxS-byte block of memory from the heap. 39 If N or S is zero, allocate and zero-fill a 1-byte block. */ 40 41 void * 42 rpl_calloc (size_t n, size_t s) 43 { 44 void *result; 45 46 #if NEED_CALLOC_GNU 47 if (n == 0 || s == 0) 48 { 49 n = 1; 50 s = 1; 51 } 52 else 53 { 54 /* Defend against buggy calloc implementations that mishandle 55 size_t overflow. */ 56 size_t bytes = n * s; 57 if (bytes / s != n) 58 { 59 errno = ENOMEM; 60 return NULL; 61 } 62 } 63 #endif 64 65 result = calloc (n, s); 66 67 #if !HAVE_CALLOC_POSIX 68 if (result == NULL) 69 errno = ENOMEM; 70 #endif 71 72 return result; 73 } 74
