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74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/* Test of calloc function.
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Copyright (C) 2010-2023 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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#include <config.h>
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/* Specification. */
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#include <stdlib.h>
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#include <errno.h>
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#include <stdint.h>
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#include "macros.h"
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/* Return N.
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Usual compilers are not able to infer something about the return value. */
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static size_t
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identity (size_t n)
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{
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unsigned int x = rand ();
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unsigned int y = x * x * x * x;
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x++; y |= x * x * x * x;
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x++; y |= x * x * x * x;
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x++; y |= x * x * x * x;
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y = y >> 1;
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y &= -y;
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y -= 8;
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/* At this point Y is zero but GCC doesn't infer this. */
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return n + y;
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}
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int
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main ()
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{
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/* Check that calloc (0, 0) is not a NULL pointer. */
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{
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void * volatile p = calloc (0, 0);
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ASSERT (p != NULL);
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free (p);
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}
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/* Check that calloc fails when requested to allocate a block of memory
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larger than PTRDIFF_MAX or SIZE_MAX bytes.
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Use 'identity' to avoid a compiler warning from GCC 7.
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'volatile' is needed to defeat an incorrect optimization by clang 10,
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see <https://bugs.llvm.org/show_bug.cgi?id=46055>. */
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{
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for (size_t n = 2; n != 0; n <<= 1)
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{
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void *volatile p = calloc (PTRDIFF_MAX / n + 1, identity (n));
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ASSERT (p == NULL);
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ASSERT (errno == ENOMEM);
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p = calloc (SIZE_MAX / n + 1, identity (n));
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ASSERT (p == NULL);
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ASSERT (errno == ENOMEM);
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}
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}
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return 0;
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}
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