1 /* Test and measure memchr functions.
2 Copyright (C) 1999-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <assert.h>
20
21 #define TEST_MAIN
22 #define TEST_NAME "rawmemchr"
23 #include "test-string.h"
24
25 typedef char *(*proto_t) (const char *, int);
26 char *simple_rawmemchr (const char *, int);
27
28 IMPL (simple_rawmemchr, 0)
29 IMPL (rawmemchr, 1)
30
31 char *
simple_rawmemchr(const char * s,int c)32 simple_rawmemchr (const char *s, int c)
33 {
34 while (1)
35 if (*s++ == (char) c)
36 return (char *) s - 1;
37 return NULL;
38 }
39
40 static void
do_one_test(impl_t * impl,const char * s,int c,char * exp_res)41 do_one_test (impl_t *impl, const char *s, int c, char *exp_res)
42 {
43 char *res = CALL (impl, s, c);
44 if (res != exp_res)
45 {
46 error (0, 0, "Wrong result in function %s %p %p", impl->name,
47 res, exp_res);
48 ret = 1;
49 return;
50 }
51 }
52
53 static void
do_test(size_t align,size_t pos,size_t len,int seek_char)54 do_test (size_t align, size_t pos, size_t len, int seek_char)
55 {
56 size_t i;
57 char *result;
58
59 align &= 7;
60 if (align + len >= page_size)
61 return;
62
63 for (i = 0; i < len; ++i)
64 {
65 buf1[align + i] = 1 + 23 * i % 127;
66 if (buf1[align + i] == seek_char)
67 buf1[align + i] = seek_char + 1;
68 }
69 buf1[align + len] = 0;
70
71 assert (pos < len);
72
73 buf1[align + pos] = seek_char;
74 buf1[align + len] = -seek_char;
75 result = (char *) (buf1 + align + pos);
76
77 FOR_EACH_IMPL (impl, 0)
78 do_one_test (impl, (char *) (buf1 + align), seek_char, result);
79 }
80
81 static void
do_random_tests(void)82 do_random_tests (void)
83 {
84 size_t i, j, n, align, pos, len;
85 int seek_char;
86 char *result;
87 unsigned char *p = buf1 + page_size - 512;
88
89 for (n = 0; n < ITERATIONS; n++)
90 {
91 align = random () & 15;
92 pos = random () & 511;
93 if (pos + align >= 512)
94 pos = 511 - align - (random () & 7);
95 len = random () & 511;
96 if (len + align >= 512)
97 len = 512 - align - (random () & 7);
98 if (pos >= len)
99 continue;
100 seek_char = random () & 255;
101 j = len + align + 64;
102 if (j > 512)
103 j = 512;
104
105 for (i = 0; i < j; i++)
106 {
107 if (i == pos + align)
108 p[i] = seek_char;
109 else
110 {
111 p[i] = random () & 255;
112 if (i < pos + align && p[i] == seek_char)
113 p[i] = seek_char + 13;
114 }
115 }
116
117 assert (pos < len);
118 size_t r = random ();
119 if ((r & 31) == 0)
120 len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
121 result = (char *) (p + pos + align);
122
123 FOR_EACH_IMPL (impl, 1)
124 if (CALL (impl, (char *) (p + align), seek_char) != result)
125 {
126 error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
127 n, impl->name, align, seek_char, len, pos,
128 CALL (impl, (char *) (p + align), seek_char),
129 result, p);
130 ret = 1;
131 }
132 }
133 }
134
135 int
test_main(void)136 test_main (void)
137 {
138 size_t i;
139
140 test_init ();
141
142 printf ("%20s", "");
143 FOR_EACH_IMPL (impl, 0)
144 printf ("\t%s", impl->name);
145 putchar ('\n');
146
147 for (i = 1; i < 7; ++i)
148 {
149 do_test (0, 16 << i, 2048, 23);
150 do_test (i, 64, 256, 23);
151 do_test (0, 16 << i, 2048, 0);
152 do_test (i, 64, 256, 0);
153 }
154 for (i = 1; i < 32; ++i)
155 {
156 do_test (0, i, i + 1, 23);
157 do_test (0, i, i + 1, 0);
158 }
159
160 do_random_tests ();
161 return ret;
162 }
163
164 #include <support/test-driver.c>
165