Ying Wang | 0543663 | 2013-04-05 16:01:00 -0700 | [diff] [blame] | 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 | } |