1/* $NetBSD: t_strlen.c,v 1.4 2011/07/12 12:08:07 njoly Exp $ */
2
3/*
4 * Written by J.T. Conklin <jtc@acorntoolworks.com>
5 * Public domain.
6 */
7
8#include <atf-c.h>
9#include <string.h>
10#include <unistd.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <dlfcn.h>
14#include <unistd.h>
15
16static void	write_num(int);
17
18static void
19write_num(int val)
20{
21	char buf[20];
22	int i;
23
24	for (i = sizeof buf; --i >= 0;) {
25		buf[i] = '0' + val % 10;
26		val /= 10;
27		if (val == 0) {
28			write(2, buf + i, sizeof buf - i);
29			return;
30		}
31	}
32	write(2, "overflow", 8);
33}
34
35ATF_TC(strlen_basic);
36ATF_TC_HEAD(strlen_basic, tc)
37{
38        atf_tc_set_md_var(tc, "descr", "Test strlen(3) results");
39}
40
41ATF_TC_BODY(strlen_basic, tc)
42{
43	/* try to trick the compiler */
44	size_t (*strlen_fn)(const char *);
45
46	unsigned int a, t;
47	size_t len;
48	char buf[64];
49
50	struct tab {
51		const char*	val;
52		size_t		len;
53	};
54
55	const struct tab tab[] = {
56		/*
57		 * patterns that check for all combinations of leading and
58		 * trailing unaligned characters (on a 64 bit processor)
59		 */
60
61		{ "",				0 },
62		{ "a",				1 },
63		{ "ab",				2 },
64		{ "abc",			3 },
65		{ "abcd",			4 },
66		{ "abcde",			5 },
67		{ "abcdef",			6 },
68		{ "abcdefg",			7 },
69		{ "abcdefgh",			8 },
70		{ "abcdefghi",			9 },
71		{ "abcdefghij",			10 },
72		{ "abcdefghijk",		11 },
73		{ "abcdefghijkl",		12 },
74		{ "abcdefghijklm",		13 },
75		{ "abcdefghijklmn",		14 },
76		{ "abcdefghijklmno",		15 },
77		{ "abcdefghijklmnop",		16 },
78		{ "abcdefghijklmnopq",		17 },
79		{ "abcdefghijklmnopqr",		18 },
80		{ "abcdefghijklmnopqrs",	19 },
81		{ "abcdefghijklmnopqrst",	20 },
82		{ "abcdefghijklmnopqrstu",	21 },
83		{ "abcdefghijklmnopqrstuv",	22 },
84		{ "abcdefghijklmnopqrstuvw",	23 },
85
86		/*
87		 * patterns that check for the cases where the expression:
88		 *
89		 *	((word - 0x7f7f..7f) & 0x8080..80)
90		 *
91		 * returns non-zero even though there are no zero bytes in
92		 * the word.
93		 */
94
95		{ "" "\xff\xff\xff\xff\xff\xff\xff\xff" "abcdefgh",	16 },
96		{ "a" "\xff\xff\xff\xff\xff\xff\xff\xff" "bcdefgh",	16 },
97		{ "ab" "\xff\xff\xff\xff\xff\xff\xff\xff" "cdefgh",	16 },
98		{ "abc" "\xff\xff\xff\xff\xff\xff\xff\xff" "defgh",	16 },
99		{ "abcd" "\xff\xff\xff\xff\xff\xff\xff\xff" "efgh",	16 },
100		{ "abcde" "\xff\xff\xff\xff\xff\xff\xff\xff" "fgh",	16 },
101		{ "abcdef" "\xff\xff\xff\xff\xff\xff\xff\xff" "gh",	16 },
102		{ "abcdefg" "\xff\xff\xff\xff\xff\xff\xff\xff" "h",	16 },
103		{ "abcdefgh" "\xff\xff\xff\xff\xff\xff\xff\xff" "",	16 },
104	};
105
106	/*
107	 * During testing it is useful have the rest of the program
108	 * use a known good version!
109	 */
110	strlen_fn = dlsym(dlopen(NULL, RTLD_LAZY), "test_strlen");
111	if (!strlen_fn)
112		strlen_fn = strlen;
113
114	for (a = 0; a < sizeof(long); ++a) {
115		for (t = 0; t < (sizeof(tab) / sizeof(tab[0])); ++t) {
116
117			memcpy(&buf[a], tab[t].val, tab[t].len + 1);
118			len = strlen_fn(&buf[a]);
119
120			if (len != tab[t].len) {
121				/* Write error without using printf / strlen */
122				write(2, "alignment ", 10);
123				write_num(a);
124				write(2, ", test ", 7);
125				write_num(t);
126				write(2, ", got len ", 10);
127				write_num(len);
128				write(2, ", not ", 6);
129				write_num(tab[t].len);
130				write(2, ", for '", 7);
131				write(2, tab[t].val, tab[t].len);
132				write(2, "'\n", 2);
133				atf_tc_fail("See stderr for details");
134			}
135		}
136	}
137}
138
139ATF_TC(strlen_huge);
140ATF_TC_HEAD(strlen_huge, tc)
141{
142        atf_tc_set_md_var(tc, "descr", "Test strlen(3) with huge strings");
143}
144
145ATF_TC_BODY(strlen_huge, tc)
146{
147	long page;
148	char *str;
149	size_t i;
150
151	page = sysconf(_SC_PAGESIZE);
152	ATF_REQUIRE(page >= 0);
153
154	for (i = 1; i < 1000; i = i + 100) {
155
156		str = malloc(i * page + 1);
157
158		if (str == NULL)
159			continue;
160
161		(void)memset(str, 'x', i * page);
162		str[i * page] = '\0';
163
164		ATF_REQUIRE(strlen(str) == i * page);
165		free(str);
166	}
167}
168
169ATF_TC(strnlen_basic);
170ATF_TC_HEAD(strnlen_basic, tc)
171{
172        atf_tc_set_md_var(tc, "descr", "A naive test of strnlen(3)");
173}
174
175ATF_TC_BODY(strnlen_basic, tc)
176{
177	char buf[1];
178
179	buf[0] = '\0';
180
181	ATF_CHECK(strnlen(buf, 000) == 0);
182	ATF_CHECK(strnlen(buf, 111) == 0);
183
184	ATF_CHECK(strnlen("xxx", 0) == 0);
185	ATF_CHECK(strnlen("xxx", 1) == 1);
186	ATF_CHECK(strnlen("xxx", 2) == 2);
187	ATF_CHECK(strnlen("xxx", 3) == 3);
188	ATF_CHECK(strnlen("xxx", 9) == 3);
189}
190
191ATF_TP_ADD_TCS(tp)
192{
193
194	ATF_TP_ADD_TC(tp, strlen_basic);
195	ATF_TP_ADD_TC(tp, strlen_huge);
196	ATF_TP_ADD_TC(tp, strnlen_basic);
197
198	return atf_no_error();
199}
200