123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/* Test of strncpy() function.
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Copyright (C) 2010-2026 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 <string.h>
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#include <stddef.h>
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#include "zerosize-ptr.h"
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#include "macros.h"
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/* Test the library, not the compiler+library. */
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static char *
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lib_strncpy (char *s1, char const *s2, size_t n)
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{
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return strncpy (s1, s2, n);
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}
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static char *(*volatile volatile_strncpy) (char *, char const *, size_t)
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= lib_strncpy;
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#undef strncpy
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#define strncpy volatile_strncpy
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#define MAGIC (char)0xBA
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static void
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check_single (const char *input, size_t length, size_t n)
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{
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char *dest;
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char *result;
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dest = (char *) malloc (1 + n + 1);
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ASSERT (dest != NULL);
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for (size_t i = 0; i < 1 + n + 1; i++)
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dest[i] = MAGIC;
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result = strncpy (dest + 1, input, n);
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ASSERT (result == dest + 1);
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ASSERT (dest[0] == MAGIC);
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{
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size_t i;
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for (i = 0; i < (n <= length ? n : length + 1); i++)
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ASSERT (dest[1 + i] == input[i]);
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for (; i < n; i++)
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ASSERT (dest[1 + i] == 0);
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}
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ASSERT (dest[1 + n] == MAGIC);
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free (dest);
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}
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static void
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check (const char *input, size_t input_length)
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{
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size_t length;
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ASSERT (input_length > 0);
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ASSERT (input[input_length - 1] == 0);
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length = input_length - 1; /* = strlen (input) */
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for (size_t n = 0; n <= 2 * length + 2; n++)
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check_single (input, length, n);
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/* Check that strncpy (D, S, N) does not look at more than
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MIN (strlen (S) + 1, N) units. */
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{
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char *page_boundary = (char *) zerosize_ptr ();
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if (page_boundary != NULL)
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{
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for (size_t n = 0; n <= 2 * length + 2; n++)
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{
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size_t n_to_copy = (n <= length ? n : length + 1);
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char *copy;
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copy = (char *) page_boundary - n_to_copy;
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for (size_t i = 0; i < n_to_copy; i++)
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copy[i] = input[i];
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check_single (copy, length, n);
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}
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}
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}
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}
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int
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main (void)
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{
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/* Simple string. */
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{ /* "Grüß Gott." */
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static const char input[] = "Gr\303\274\303\237 Gott.";
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check (input, SIZEOF (input));
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}
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/* Test zero-length operations on NULL pointers, allowed by
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<https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf>. */
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ASSERT (strncpy (NULL, "x", 0) == NULL);
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{
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char y[1];
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ASSERT (strncpy (y, NULL, 0) == y);
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}
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return test_exit_status;
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}
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