1 /* Test and measure memrchr functions.
2 Copyright (C) 2013-2021 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 #define TEST_MAIN
20 #define TEST_NAME "memrchr"
21 #include "test-string.h"
22
23 typedef char *(*proto_t) (const char *, int, size_t);
24 char *simple_memrchr (const char *, int, size_t);
25
26 IMPL (simple_memrchr, 0)
27 IMPL (memrchr, 1)
28
29 char *
simple_memrchr(const char * s,int c,size_t n)30 simple_memrchr (const char *s, int c, size_t n)
31 {
32 s = s + n;
33 while (n--)
34 if (*--s == (char) c)
35 return (char *) s;
36 return NULL;
37 }
38
39 static void
do_one_test(impl_t * impl,const char * s,int c,size_t n,char * exp_res)40 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
41 {
42 char *res = CALL (impl, s, c, n);
43 if (res != exp_res)
44 {
45 error (0, 0, "Wrong result in function %s %p %p", impl->name,
46 res, exp_res);
47 ret = 1;
48 return;
49 }
50 }
51
52 static void
do_test(size_t align,size_t pos,size_t len,int seek_char)53 do_test (size_t align, size_t pos, size_t len, int seek_char)
54 {
55 size_t i;
56 char *result;
57
58 align &= 7;
59 if (align + len >= page_size)
60 return;
61
62 for (i = 0; i < len; ++i)
63 {
64 buf1[align + i] = 1 + 23 * i % 127;
65 if (buf1[align + i] == seek_char)
66 buf1[align + i] = seek_char + 1;
67 }
68 buf1[align + len] = 0;
69
70 if (pos < len)
71 {
72 buf1[align + pos] = seek_char;
73 buf1[align + len] = -seek_char;
74 result = (char *) (buf1 + align + pos);
75 }
76 else
77 {
78 result = NULL;
79 buf1[align + len] = seek_char;
80 }
81
82 FOR_EACH_IMPL (impl, 0)
83 do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
84 }
85
86 static void
do_random_tests(void)87 do_random_tests (void)
88 {
89 size_t i, j, n, align, pos, len;
90 int seek_char;
91 char *result;
92 unsigned char *p = buf1 + page_size - 512;
93
94 for (n = 0; n < ITERATIONS; n++)
95 {
96 align = random () & 15;
97 pos = random () & 511;
98 if (pos + align >= 512)
99 pos = 511 - align - (random () & 7);
100 len = random () & 511;
101 if (pos >= len)
102 len = pos + (random () & 7);
103 if (len + align >= 512)
104 len = 512 - align - (random () & 7);
105 seek_char = random () & 255;
106 j = len + align + 64;
107 if (j > 512)
108 j = 512;
109
110 for (i = 0; i < j; i++)
111 {
112 if (i == pos + align)
113 p[i] = seek_char;
114 else
115 {
116 p[i] = random () & 255;
117 if (p[i] == seek_char)
118 p[i] = seek_char + 13;
119 }
120 }
121
122 if (pos < len)
123 result = (char *) (p + pos + align);
124 else
125 result = NULL;
126
127 FOR_EACH_IMPL (impl, 1)
128 if (CALL (impl, (char *) (p + align), seek_char, len) != result)
129 {
130 error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
131 n, impl->name, align, seek_char, len, pos,
132 CALL (impl, (char *) (p + align), seek_char, len),
133 result, p);
134 ret = 1;
135 }
136 }
137 }
138
139 int
test_main(void)140 test_main (void)
141 {
142 size_t i;
143
144 test_init ();
145
146 printf ("%20s", "");
147 FOR_EACH_IMPL (impl, 0)
148 printf ("\t%s", impl->name);
149 putchar ('\n');
150
151 for (i = 1; i < 8; ++i)
152 {
153 /* Test len == 0. */
154 do_test (i, i, 0, 0);
155 do_test (i, i, 0, 23);
156
157 do_test (0, 16 << i, 2048, 23);
158 do_test (i, 64, 256, 23);
159 do_test (0, 16 << i, 2048, 0);
160 do_test (i, 64, 256, 0);
161
162 do_test (0, i, 256, 23);
163 do_test (0, i, 256, 0);
164 do_test (i, i, 256, 23);
165 do_test (i, i, 256, 0);
166
167 }
168 for (i = 1; i < 32; ++i)
169 {
170 do_test (0, i, i + 1, 23);
171 do_test (0, i, i + 1, 0);
172 do_test (i, i, i + 1, 23);
173 do_test (i, i, i + 1, 0);
174
175 do_test (0, 1, i + 1, 23);
176 do_test (0, 2, i + 1, 0);
177 do_test (i, 1, i + 1, 23);
178 do_test (i, 2, i + 1, 0);
179 }
180
181 do_random_tests ();
182 return ret;
183 }
184
185 #include <support/test-driver.c>
186