summaryrefslogtreecommitdiffstats
path: root/lib/globtest.c
blob: d8e97d43b905a3002c6d49d4792a76a8d8d91c02 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/*
 * Extracted fronm glob.c
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/glob.h>
#include <linux/printk.h>

/* Boot with "glob.verbose=1" to show successful tests, too */
static bool verbose = false;
module_param(verbose, bool, 0);

struct glob_test {
	char const *pat, *str;
	bool expected;
};

static bool __pure __init test(char const *pat, char const *str, bool expected)
{
	bool match = glob_match(pat, str);
	bool success = match == expected;

	/* Can't get string literals into a particular section, so... */
	static char const msg_error[] __initconst =
		KERN_ERR "glob: \"%s\" vs. \"%s\": %s *** ERROR ***\n";
	static char const msg_ok[] __initconst =
		KERN_DEBUG "glob: \"%s\" vs. \"%s\": %s OK\n";
	static char const mismatch[] __initconst = "mismatch";
	char const *message;

	if (!success)
		message = msg_error;
	else if (verbose)
		message = msg_ok;
	else
		return success;

	printk(message, pat, str, mismatch + 3*match);
	return success;
}

/*
 * The tests are all jammed together in one array to make it simpler
 * to place that array in the .init.rodata section.  The obvious
 * "array of structures containing char *" has no way to force the
 * pointed-to strings to be in a particular section.
 *
 * Anyway, a test consists of:
 * 1. Expected glob_match result: '1' or '0'.
 * 2. Pattern to match: null-terminated string
 * 3. String to match against: null-terminated string
 *
 * The list of tests is terminated with a final '\0' instead of
 * a glob_match result character.
 */
static char const glob_tests[] __initconst =
	/* Some basic tests */
	"1" "a\0" "a\0"
	"0" "a\0" "b\0"
	"0" "a\0" "aa\0"
	"0" "a\0" "\0"
	"1" "\0" "\0"
	"0" "\0" "a\0"
	/* Simple character class tests */
	"1" "[a]\0" "a\0"
	"0" "[a]\0" "b\0"
	"0" "[!a]\0" "a\0"
	"1" "[!a]\0" "b\0"
	"1" "[ab]\0" "a\0"
	"1" "[ab]\0" "b\0"
	"0" "[ab]\0" "c\0"
	"1" "[!ab]\0" "c\0"
	"1" "[a-c]\0" "b\0"
	"0" "[a-c]\0" "d\0"
	/* Corner cases in character class parsing */
	"1" "[a-c-e-g]\0" "-\0"
	"0" "[a-c-e-g]\0" "d\0"
	"1" "[a-c-e-g]\0" "f\0"
	"1" "[]a-ceg-ik[]\0" "a\0"
	"1" "[]a-ceg-ik[]\0" "]\0"
	"1" "[]a-ceg-ik[]\0" "[\0"
	"1" "[]a-ceg-ik[]\0" "h\0"
	"0" "[]a-ceg-ik[]\0" "f\0"
	"0" "[!]a-ceg-ik[]\0" "h\0"
	"0" "[!]a-ceg-ik[]\0" "]\0"
	"1" "[!]a-ceg-ik[]\0" "f\0"
	/* Simple wild cards */
	"1" "?\0" "a\0"
	"0" "?\0" "aa\0"
	"0" "??\0" "a\0"
	"1" "?x?\0" "axb\0"
	"0" "?x?\0" "abx\0"
	"0" "?x?\0" "xab\0"
	/* Asterisk wild cards (backtracking) */
	"0" "*??\0" "a\0"
	"1" "*??\0" "ab\0"
	"1" "*??\0" "abc\0"
	"1" "*??\0" "abcd\0"
	"0" "??*\0" "a\0"
	"1" "??*\0" "ab\0"
	"1" "??*\0" "abc\0"
	"1" "??*\0" "abcd\0"
	"0" "?*?\0" "a\0"
	"1" "?*?\0" "ab\0"
	"1" "?*?\0" "abc\0"
	"1" "?*?\0" "abcd\0"
	"1" "*b\0" "b\0"
	"1" "*b\0" "ab\0"
	"0" "*b\0" "ba\0"
	"1" "*b\0" "bb\0"
	"1" "*b\0" "abb\0"
	"1" "*b\0" "bab\0"
	"1" "*bc\0" "abbc\0"
	"1" "*bc\0" "bc\0"
	"1" "*bc\0" "bbc\0"
	"1" "*bc\0" "bcbc\0"
	/* Multiple asterisks (complex backtracking) */
	"1" "*ac*\0" "abacadaeafag\0"
	"1" "*ac*ae*ag*\0" "abacadaeafag\0"
	"1" "*a*b*[bc]*[ef]*g*\0" "abacadaeafag\0"
	"0" "*a*b*[ef]*[cd]*g*\0" "abacadaeafag\0"
	"1" "*abcd*\0" "abcabcabcabcdefg\0"
	"1" "*ab*cd*\0" "abcabcabcabcdefg\0"
	"1" "*abcd*abcdef*\0" "abcabcdabcdeabcdefg\0"
	"0" "*abcd*\0" "abcabcabcabcefg\0"
	"0" "*ab*cd*\0" "abcabcabcabcefg\0";

static int __init glob_init(void)
{
	unsigned successes = 0;
	unsigned n = 0;
	char const *p = glob_tests;
	static char const message[] __initconst =
		KERN_INFO "glob: %u self-tests passed, %u failed\n";

	/*
	 * Tests are jammed together in a string.  The first byte is '1'
	 * or '0' to indicate the expected outcome, or '\0' to indicate the
	 * end of the tests.  Then come two null-terminated strings: the
	 * pattern and the string to match it against.
	 */
	while (*p) {
		bool expected = *p++ & 1;
		char const *pat = p;

		p += strlen(p) + 1;
		successes += test(pat, p, expected);
		p += strlen(p) + 1;
		n++;
	}

	n -= successes;
	printk(message, successes, n);

	/* What's the errno for "kernel bug detected"?  Guess... */
	return n ? -ECANCELED : 0;
}

/* We need a dummy exit function to allow unload */
static void __exit glob_fini(void) { }

module_init(glob_init);
module_exit(glob_fini);

MODULE_DESCRIPTION("glob(7) matching tests");
MODULE_LICENSE("Dual MIT/GPL");
OpenPOWER on IntegriCloud