xref: /openbsd-src/regress/lib/libc/strchr/strchrtest.c (revision c13ff7ac6c9d7ada6c41f3c3e389cb815654d94e)
1 /*	$OpenBSD: strchrtest.c,v 1.2 2021/09/01 09:26:32 jasper Exp $	*/
2 
3 /*
4  * Copyright (c) 2021 Visa Hankala
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include <assert.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24 
25 int
main(void)26 main(void)
27 {
28 	char *buf;
29 	size_t bufsize;
30 
31 	/* Allocate buffer with guard pages. */
32 	bufsize = getpagesize();
33 	buf = malloc(bufsize);
34 	if (buf == NULL) {
35 		fprintf(stderr, "unable to allocate memory\n");
36 		return 1;
37 	}
38 
39 	memset(buf, 0, bufsize);
40 	assert(strchr(buf, 'a') == NULL);
41 	assert(strchr(buf, '\0') == buf);
42 	assert(strrchr(buf, 'a') == NULL);
43 	assert(strrchr(buf, '\0') == buf);
44 
45 	memcpy(buf, "haystack\xcf\x80", 10);
46 	assert(strchr(buf, 'a') == buf + 1);
47 	assert(strchr(buf, '\x80') == buf + 9);
48 	assert(strchr(buf, 0x180) == buf + 9);
49 	assert(strchr(buf, '\0') == buf + 10);
50 	assert(strrchr(buf, 'a') == buf + 5);
51 	assert(strrchr(buf, '\xcf') == buf + 8);
52 	assert(strrchr(buf, 0x3cf) == buf + 8);
53 	assert(strrchr(buf, '\0') == buf + 10);
54 
55 	memset(buf, 'a', bufsize - 2);
56 	buf[0] = 'b';
57 	buf[bufsize - 2] = 'b';
58 	assert(strchr(buf, 'b') == buf);
59 	assert(strchr(buf, 'c') == NULL);
60 	assert(strchr(buf, '\0') == buf + bufsize - 1);
61 	assert(strrchr(buf, 'b') == buf + bufsize - 2);
62 	assert(strrchr(buf, 'c') == NULL);
63 	assert(strrchr(buf, '\0') == buf + bufsize - 1);
64 
65 	return 0;
66 }
67