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136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/* Test for reallocarray.
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Copyright (C) 2017-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <malloc.h>
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#include <string.h>
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#include <support/check.h>
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#include <libc-diag.h>
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static void *
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reallocarray_nowarn (void *ptr, size_t nmemb, size_t size)
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{
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#if __GNUC_PREREQ (7, 0)
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/* GCC 7 warns about too-large allocations; here we want to test
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that they fail. */
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DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
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#endif
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void *ret = reallocarray (ptr, nmemb, size);
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#if __GNUC_PREREQ (7, 0)
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DIAG_POP_NEEDS_COMMENT;
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#endif
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return ret;
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}
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static int
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do_test (void)
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{
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void *ptr = NULL;
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void *ptr2 = NULL;
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unsigned char *c;
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size_t i;
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int ok;
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const size_t max = ~(size_t)0;
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size_t a, b;
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/* Test overflow detection. */
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errno = 0;
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ptr = reallocarray_nowarn (NULL, max, 2);
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TEST_VERIFY (!ptr);
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TEST_VERIFY (errno == ENOMEM);
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errno = 0;
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ptr = reallocarray_nowarn (NULL, 2, max);
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TEST_VERIFY (!ptr);
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TEST_VERIFY (errno == ENOMEM);
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a = 65537;
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b = max/65537 + 1;
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errno = 0;
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ptr = reallocarray_nowarn (NULL, a, b);
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TEST_VERIFY (!ptr);
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TEST_VERIFY (errno == ENOMEM);
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errno = 0;
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ptr = reallocarray_nowarn (NULL, b, a);
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TEST_VERIFY (!ptr);
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TEST_VERIFY (errno == ENOMEM);
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/* Test realloc-like behavior. */
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/* Allocate memory like malloc. */
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ptr = reallocarray (NULL, 10, 2);
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TEST_VERIFY_EXIT (ptr);
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TEST_VERIFY_EXIT (malloc_usable_size (ptr) >= 10*2);
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memset (ptr, 0xAF, 10*2);
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/* Enlarge buffer. */
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ptr2 = reallocarray (ptr, 20, 2);
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TEST_VERIFY (ptr2);
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if (ptr2)
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ptr = ptr2;
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TEST_VERIFY (malloc_usable_size (ptr) >= 20*2);
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c = ptr;
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ok = 1;
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for (i = 0; i < 10*2; ++i)
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{
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if (c[i] != 0xAF)
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ok = 0;
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}
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TEST_VERIFY (ok);
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/* Decrease buffer size. */
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ptr2 = reallocarray (ptr, 5, 3);
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TEST_VERIFY (ptr2);
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if (ptr2)
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ptr = ptr2;
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TEST_VERIFY_EXIT (malloc_usable_size (ptr) >= 5*3);
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c = ptr;
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ok = 1;
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for (i = 0; i < 5*3; ++i)
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{
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if (c[i] != 0xAF)
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ok = 0;
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}
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TEST_VERIFY (ok);
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/* Overflow should leave buffer untouched. */
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errno = 0;
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ptr2 = reallocarray_nowarn (ptr, 2, ~(size_t)0);
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TEST_VERIFY (!ptr2);
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TEST_VERIFY (errno == ENOMEM);
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c = ptr;
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ok = 1;
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for (i = 0; i < 5*3; ++i)
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{
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if (c[i] != 0xAF)
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ok = 0;
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}
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TEST_VERIFY (ok);
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free (ptr);
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return 0;
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}
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#include <support/test-driver.c>
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