74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
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/* calloc() function that is glibc compatible.
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This wrapper function is required at least on Tru64 UNIX 5.1 and mingw.
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Copyright (C) 2004-2007, 2009-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* written by Jim Meyering and Bruno Haible */
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#include <config.h>
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/* Only the AC_FUNC_CALLOC macro defines 'calloc' already in config.h. */
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#ifdef calloc
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# define NEED_CALLOC_GNU 1
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# undef calloc
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/* Whereas the gnulib module 'calloc-gnu' defines HAVE_CALLOC_GNU. */
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#elif GNULIB_CALLOC_GNU && !HAVE_CALLOC_GNU
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# define NEED_CALLOC_GNU 1
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#endif
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/* Specification. */
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#include <stdlib.h>
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#include <errno.h>
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/* Call the system's calloc below. */
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#undef calloc
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/* Allocate and zero-fill an NxS-byte block of memory from the heap.
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If N or S is zero, allocate and zero-fill a 1-byte block. */
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void *
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rpl_calloc (size_t n, size_t s)
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{
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void *result;
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#if NEED_CALLOC_GNU
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if (n == 0 || s == 0)
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{
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n = 1;
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s = 1;
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}
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else
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{
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/* Defend against buggy calloc implementations that mishandle
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size_t overflow. */
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size_t bytes = n * s;
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if (bytes / s != n)
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{
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errno = ENOMEM;
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return NULL;
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}
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}
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#endif
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result = calloc (n, s);
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#if !HAVE_CALLOC_POSIX
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if (result == NULL)
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errno = ENOMEM;
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#endif
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return result;
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}
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