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/*
* Copyright (C) 2008-2026 Free Software Foundation, Inc.
* Written by Eric Blake and Bruno Haible
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <string.h>
#include "signature.h"
SIGNATURE_CHECK (strchrnul, char *, (char const *, int));
#include <stdlib.h>
#include "macros.h"
int
main (void)
{
size_t n = 0x100000;
char *input = malloc (n + 1);
ASSERT (input);
input[0] = 'a';
input[1] = 'b';
memset (input + 2, 'c', 1024);
memset (input + 1026, 'd', n - 1028);
input[n - 2] = 'e';
input[n - 1] = 'a';
input[n] = '\0';
/* Basic behavior tests. */
ASSERT (strchrnul (input, 'a') == input);
ASSERT (strchrnul (input, 'b') == input + 1);
ASSERT (strchrnul (input, 'c') == input + 2);
ASSERT (strchrnul (input, 'd') == input + 1026);
ASSERT (strchrnul (input + 1, 'a') == input + n - 1);
ASSERT (strchrnul (input + 1, 'e') == input + n - 2);
ASSERT (strchrnul (input, 'f') == input + n);
ASSERT (strchrnul (input, '\0') == input + n);
/* Check that a very long haystack is handled quickly if the byte is
found near the beginning. */
{
size_t repeat = 10000;
for (; repeat > 0; repeat--)
{
ASSERT (strchrnul (input, 'c') == input + 2);
}
}
/* Alignment tests. */
for (int i = 0; i < 32; i++)
{
for (int j = 0; j < 256; j++)
input[i + j] = (j + 1) & 0xff;
for (int j = 1; j < 256; j++)
{
ASSERT (strchrnul (input + i, j) == input + i + j - 1);
input[i + j - 1] = (j == 1 ? 2 : 1);
ASSERT (strchrnul (input + i, j) == input + i + 255);
input[i + j - 1] = j;
}
}
free (input);
return test_exit_status;
}
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