/*      $OpenBSD: strchrtest.c,v 1.2 2021/09/01 09:26:32 jasper Exp $   */

/*
 * Copyright (c) 2021 Visa Hankala
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int
main(void)
{
        char *buf;
        size_t bufsize;

        /* Allocate buffer with guard pages. */
        bufsize = getpagesize();
        buf = malloc(bufsize);
        if (buf == NULL) {
                fprintf(stderr, "unable to allocate memory\n");
                return 1;
        }

        memset(buf, 0, bufsize);
        assert(strchr(buf, 'a') == NULL);
        assert(strchr(buf, '\0') == buf);
        assert(strrchr(buf, 'a') == NULL);
        assert(strrchr(buf, '\0') == buf);

        memcpy(buf, "haystack\xcf\x80", 10);
        assert(strchr(buf, 'a') == buf + 1);
        assert(strchr(buf, '\x80') == buf + 9);
        assert(strchr(buf, 0x180) == buf + 9);
        assert(strchr(buf, '\0') == buf + 10);
        assert(strrchr(buf, 'a') == buf + 5);
        assert(strrchr(buf, '\xcf') == buf + 8);
        assert(strrchr(buf, 0x3cf) == buf + 8);
        assert(strrchr(buf, '\0') == buf + 10);

        memset(buf, 'a', bufsize - 2);
        buf[0] = 'b';
        buf[bufsize - 2] = 'b';
        assert(strchr(buf, 'b') == buf);
        assert(strchr(buf, 'c') == NULL);
        assert(strchr(buf, '\0') == buf + bufsize - 1);
        assert(strrchr(buf, 'b') == buf + bufsize - 2);
        assert(strrchr(buf, 'c') == NULL);
        assert(strrchr(buf, '\0') == buf + bufsize - 1);

        return 0;
}