1 /* Copyright (C) 2002 Free Software Foundation.
2
3 Test strncmp with various combinations of pointer alignments and lengths to
4 make sure any optimizations in the library are correct.
5
6 Written by Michael Meissner, March 9, 2002. */
7
8 #include <string.h>
9 #include <stddef.h>
10
11 #ifndef MAX_OFFSET
12 #define MAX_OFFSET (sizeof (long long))
13 #endif
14
15 #ifndef MAX_TEST
16 #define MAX_TEST (8 * sizeof (long long))
17 #endif
18
19 #ifndef MAX_EXTRA
20 #define MAX_EXTRA (sizeof (long long))
21 #endif
22
23 #define MAX_LENGTH (MAX_OFFSET + MAX_TEST + MAX_EXTRA)
24
25 static union {
26 unsigned char buf[MAX_LENGTH];
27 long long align_int;
28 long double align_fp;
29 } u1, u2;
30
31 void
test(const unsigned char * s1,const unsigned char * s2,size_t len,int expected)32 test (const unsigned char *s1, const unsigned char *s2, size_t len, int expected)
33 {
34 int value = strncmp ((char *) s1, (char *) s2, len);
35
36 if (expected < 0 && value >= 0)
37 abort ();
38 else if (expected == 0 && value != 0)
39 abort ();
40 else if (expected > 0 && value <= 0)
41 abort ();
42 }
43
main()44 main ()
45 {
46 size_t off1, off2, len, i;
47 unsigned char *buf1, *buf2;
48 unsigned char *mod1, *mod2;
49 unsigned char *p1, *p2;
50
51 for (off1 = 0; off1 < MAX_OFFSET; off1++)
52 for (off2 = 0; off2 < MAX_OFFSET; off2++)
53 for (len = 0; len < MAX_TEST; len++)
54 {
55 p1 = u1.buf;
56 for (i = 0; i < off1; i++)
57 *p1++ = '\0';
58
59 buf1 = p1;
60 for (i = 0; i < len; i++)
61 *p1++ = 'a';
62
63 mod1 = p1;
64 for (i = 0; i < MAX_EXTRA; i++)
65 *p1++ = 'x';
66
67 p2 = u2.buf;
68 for (i = 0; i < off2; i++)
69 *p2++ = '\0';
70
71 buf2 = p2;
72 for (i = 0; i < len; i++)
73 *p2++ = 'a';
74
75 mod2 = p2;
76 for (i = 0; i < MAX_EXTRA; i++)
77 *p2++ = 'x';
78
79 mod1[0] = '\0';
80 mod2[0] = '\0';
81 test (buf1, buf2, MAX_LENGTH, 0);
82 test (buf1, buf2, len, 0);
83
84 mod1[0] = 'a';
85 mod1[1] = '\0';
86 mod2[0] = '\0';
87 test (buf1, buf2, MAX_LENGTH, +1);
88 test (buf1, buf2, len, 0);
89
90 mod1[0] = '\0';
91 mod2[0] = 'a';
92 mod2[1] = '\0';
93 test (buf1, buf2, MAX_LENGTH, -1);
94 test (buf1, buf2, len, 0);
95
96 mod1[0] = 'b';
97 mod1[1] = '\0';
98 mod2[0] = 'c';
99 mod2[1] = '\0';
100 test (buf1, buf2, MAX_LENGTH, -1);
101 test (buf1, buf2, len, 0);
102
103 mod1[0] = 'c';
104 mod1[1] = '\0';
105 mod2[0] = 'b';
106 mod2[1] = '\0';
107 test (buf1, buf2, MAX_LENGTH, +1);
108 test (buf1, buf2, len, 0);
109
110 mod1[0] = 'b';
111 mod1[1] = '\0';
112 mod2[0] = (unsigned char)'\251';
113 mod2[1] = '\0';
114 test (buf1, buf2, MAX_LENGTH, -1);
115 test (buf1, buf2, len, 0);
116
117 mod1[0] = (unsigned char)'\251';
118 mod1[1] = '\0';
119 mod2[0] = 'b';
120 mod2[1] = '\0';
121 test (buf1, buf2, MAX_LENGTH, +1);
122 test (buf1, buf2, len, 0);
123
124 mod1[0] = (unsigned char)'\251';
125 mod1[1] = '\0';
126 mod2[0] = (unsigned char)'\252';
127 mod2[1] = '\0';
128 test (buf1, buf2, MAX_LENGTH, -1);
129 test (buf1, buf2, len, 0);
130
131 mod1[0] = (unsigned char)'\252';
132 mod1[1] = '\0';
133 mod2[0] = (unsigned char)'\251';
134 mod2[1] = '\0';
135 test (buf1, buf2, MAX_LENGTH, +1);
136 test (buf1, buf2, len, 0);
137 }
138
139 exit (0);
140 }
141