t_strlen.c revision 314817 
1/* $NetBSD: t_strlen.c,v 1.6 2017/01/14 20:49:24 christos 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	void *dl_handle;
44	/* try to trick the compiler */
45	size_t (*strlen_fn)(const char *);
46
47	unsigned int a, t;
48	size_t len;
49	char buf[64];
50
51	struct tab {
52		const char*	val;
53		size_t		len;
54	};
55
56	const struct tab tab[] = {
57		/*
58		 * patterns that check for all combinations of leading and
59		 * trailing unaligned characters (on a 64 bit processor)
60		 */
61
62		{ "",				0 },
63		{ "a",				1 },
64		{ "ab",				2 },
65		{ "abc",			3 },
66		{ "abcd",			4 },
67		{ "abcde",			5 },
68		{ "abcdef",			6 },
69		{ "abcdefg",			7 },
70		{ "abcdefgh",			8 },
71		{ "abcdefghi",			9 },
72		{ "abcdefghij",			10 },
73		{ "abcdefghijk",		11 },
74		{ "abcdefghijkl",		12 },
75		{ "abcdefghijklm",		13 },
76		{ "abcdefghijklmn",		14 },
77		{ "abcdefghijklmno",		15 },
78		{ "abcdefghijklmnop",		16 },
79		{ "abcdefghijklmnopq",		17 },
80		{ "abcdefghijklmnopqr",		18 },
81		{ "abcdefghijklmnopqrs",	19 },
82		{ "abcdefghijklmnopqrst",	20 },
83		{ "abcdefghijklmnopqrstu",	21 },
84		{ "abcdefghijklmnopqrstuv",	22 },
85		{ "abcdefghijklmnopqrstuvw",	23 },
86
87		/*
88		 * patterns that check for the cases where the expression:
89		 *
90		 *	((word - 0x7f7f..7f) & 0x8080..80)
91		 *
92		 * returns non-zero even though there are no zero bytes in
93		 * the word.
94		 */
95
96		{ "" "\xff\xff\xff\xff\xff\xff\xff\xff" "abcdefgh",	16 },
97		{ "a" "\xff\xff\xff\xff\xff\xff\xff\xff" "bcdefgh",	16 },
98		{ "ab" "\xff\xff\xff\xff\xff\xff\xff\xff" "cdefgh",	16 },
99		{ "abc" "\xff\xff\xff\xff\xff\xff\xff\xff" "defgh",	16 },
100		{ "abcd" "\xff\xff\xff\xff\xff\xff\xff\xff" "efgh",	16 },
101		{ "abcde" "\xff\xff\xff\xff\xff\xff\xff\xff" "fgh",	16 },
102		{ "abcdef" "\xff\xff\xff\xff\xff\xff\xff\xff" "gh",	16 },
103		{ "abcdefg" "\xff\xff\xff\xff\xff\xff\xff\xff" "h",	16 },
104		{ "abcdefgh" "\xff\xff\xff\xff\xff\xff\xff\xff" "",	16 },
105	};
106
107	/*
108	 * During testing it is useful have the rest of the program
109	 * use a known good version!
110	 */
111	dl_handle = dlopen(NULL, RTLD_LAZY);
112	strlen_fn = dlsym(dl_handle, "test_strlen");
113	if (!strlen_fn)
114		strlen_fn = strlen;
115
116	for (a = 0; a < sizeof(long); ++a) {
117		for (t = 0; t < (sizeof(tab) / sizeof(tab[0])); ++t) {
118
119			memcpy(&buf[a], tab[t].val, tab[t].len + 1);
120			len = strlen_fn(&buf[a]);
121
122			if (len != tab[t].len) {
123				/* Write error without using printf / strlen */
124				write(2, "alignment ", 10);
125				write_num(a);
126				write(2, ", test ", 7);
127				write_num(t);
128				write(2, ", got len ", 10);
129				write_num(len);
130				write(2, ", not ", 6);
131				write_num(tab[t].len);
132				write(2, ", for '", 7);
133				write(2, tab[t].val, tab[t].len);
134				write(2, "'\n", 2);
135				atf_tc_fail("See stderr for details");
136			}
137		}
138	}
139	(void)dlclose(dl_handle);
140}
141
142ATF_TC(strlen_huge);
143ATF_TC_HEAD(strlen_huge, tc)
144{
145        atf_tc_set_md_var(tc, "descr", "Test strlen(3) with huge strings");
146}
147
148ATF_TC_BODY(strlen_huge, tc)
149{
150	long page;
151	char *str;
152	size_t i;
153
154	page = sysconf(_SC_PAGESIZE);
155	ATF_REQUIRE(page >= 0);
156
157	for (i = 1; i < 1000; i = i + 100) {
158
159		str = malloc(i * page + 1);
160
161		if (str == NULL)
162			continue;
163
164		(void)memset(str, 'x', i * page);
165		str[i * page] = '\0';
166
167		ATF_REQUIRE(strlen(str) == i * page);
168		free(str);
169	}
170}
171
172ATF_TC(strnlen_basic);
173ATF_TC_HEAD(strnlen_basic, tc)
174{
175        atf_tc_set_md_var(tc, "descr", "A naive test of strnlen(3)");
176}
177
178ATF_TC_BODY(strnlen_basic, tc)
179{
180	char buf[1];
181
182	buf[0] = '\0';
183
184	ATF_CHECK(strnlen(buf, 000) == 0);
185	ATF_CHECK(strnlen(buf, 111) == 0);
186
187	ATF_CHECK(strnlen("xxx", 0) == 0);
188	ATF_CHECK(strnlen("xxx", 1) == 1);
189	ATF_CHECK(strnlen("xxx", 2) == 2);
190	ATF_CHECK(strnlen("xxx", 3) == 3);
191	ATF_CHECK(strnlen("xxx", 9) == 3);
192}
193
194ATF_TP_ADD_TCS(tp)
195{
196
197	ATF_TP_ADD_TC(tp, strlen_basic);
198	ATF_TP_ADD_TC(tp, strlen_huge);
199	ATF_TP_ADD_TC(tp, strnlen_basic);
200
201	return atf_no_error();
202}
203