1 /* Test and measure memrchr functions.
2 Copyright (C) 2013-2022 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
25 IMPL (memrchr, 1)
26
27 /* Naive implementation to verify results. */
28 char *
simple_memrchr(const char * s,int c,size_t n)29 simple_memrchr (const char *s, int c, size_t n)
30 {
31 s = s + n;
32 while (n--)
33 if (*--s == (char) c)
34 return (char *) s;
35 return NULL;
36 }
37
38 static void
do_one_test(impl_t * impl,const char * s,int c,size_t n,char * exp_res)39 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
40 {
41 char *res = CALL (impl, s, c, n);
42 if (res != exp_res)
43 {
44 error (0, 0, "Wrong result in function %s %p %p", impl->name,
45 res, exp_res);
46 ret = 1;
47 return;
48 }
49 }
50
51 static void
do_test(size_t align,size_t pos,size_t len,int seek_char)52 do_test (size_t align, size_t pos, size_t len, int seek_char)
53 {
54 size_t i;
55 char *result;
56
57 align &= 7;
58 if (align + len >= page_size)
59 return;
60
61 for (i = 0; i < len; ++i)
62 {
63 buf1[align + i] = 1 + 23 * i % 127;
64 if (buf1[align + i] == seek_char)
65 buf1[align + i] = seek_char + 1;
66 }
67 buf1[align + len] = 0;
68
69 if (pos < len)
70 {
71 buf1[align + pos] = seek_char;
72 buf1[align + len] = -seek_char;
73 result = (char *) (buf1 + align + pos);
74 }
75 else
76 {
77 result = NULL;
78 buf1[align + len] = seek_char;
79 }
80
81 FOR_EACH_IMPL (impl, 0)
82 do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
83 }
84
85 static void
do_random_tests(void)86 do_random_tests (void)
87 {
88 size_t i, j, n, align, pos, len;
89 int seek_char;
90 char *result;
91 unsigned char *p = buf1 + page_size - 512;
92
93 for (n = 0; n < ITERATIONS; n++)
94 {
95 align = random () & 15;
96 pos = random () & 511;
97 if (pos + align >= 512)
98 pos = 511 - align - (random () & 7);
99 len = random () & 511;
100 if (pos >= len)
101 len = pos + (random () & 7);
102 if (len + align >= 512)
103 len = 512 - align - (random () & 7);
104 seek_char = random () & 255;
105 j = len + align + 64;
106 if (j > 512)
107 j = 512;
108
109 for (i = 0; i < j; i++)
110 {
111 if (i == pos + align)
112 p[i] = seek_char;
113 else
114 {
115 p[i] = random () & 255;
116 if (p[i] == seek_char)
117 p[i] = seek_char + 13;
118 }
119 }
120
121 if (pos < len)
122 result = (char *) (p + pos + align);
123 else
124 result = NULL;
125
126 FOR_EACH_IMPL (impl, 1)
127 if (CALL (impl, (char *) (p + align), seek_char, len) != result)
128 {
129 error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
130 n, impl->name, align, seek_char, len, pos,
131 CALL (impl, (char *) (p + align), seek_char, len),
132 result, p);
133 ret = 1;
134 }
135 }
136 }
137
138 int
test_main(void)139 test_main (void)
140 {
141 size_t i;
142
143 test_init ();
144
145 printf ("%20s", "");
146 FOR_EACH_IMPL (impl, 0)
147 printf ("\t%s", impl->name);
148 putchar ('\n');
149
150 for (i = 1; i < 8; ++i)
151 {
152 /* Test len == 0. */
153 do_test (i, i, 0, 0);
154 do_test (i, i, 0, 23);
155
156 do_test (0, 16 << i, 2048, 23);
157 do_test (i, 64, 256, 23);
158 do_test (0, 16 << i, 2048, 0);
159 do_test (i, 64, 256, 0);
160
161 do_test (0, i, 256, 23);
162 do_test (0, i, 256, 0);
163 do_test (i, i, 256, 23);
164 do_test (i, i, 256, 0);
165
166 }
167 for (i = 1; i < 32; ++i)
168 {
169 do_test (0, i, i + 1, 23);
170 do_test (0, i, i + 1, 0);
171 do_test (i, i, i + 1, 23);
172 do_test (i, i, i + 1, 0);
173
174 do_test (0, 1, i + 1, 23);
175 do_test (0, 2, i + 1, 0);
176 do_test (i, 1, i + 1, 23);
177 do_test (i, 2, i + 1, 0);
178 }
179
180 do_random_tests ();
181 return ret;
182 }
183
184 #include <support/test-driver.c>
185