1 /* Test and measure memrchr functions.
2 Copyright (C) 2013-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #define TEST_NAME "memrchr"
21 #include "test-string.h"
23 typedef char *(*proto_t) (const char *, int, size_t);
27 /* Also check the generic implementation. */
29 #define weak_alias(a, b)
30 #define MEMRCHR __memrchr_default
31 #include "string/memrchr.c"
32 IMPL (__memrchr_default, 1)
34 /* Naive implementation to verify results. */
36 simple_memrchr (const char *s, int c, size_t n)
46 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
48 char *res = CALL (impl, s, c, n);
51 error (0, 0, "Wrong result in function %s %p %p", impl->name,
59 do_test (size_t align, size_t pos, size_t len, int seek_char)
65 if (align + len >= page_size)
68 for (i = 0; i < len; ++i)
70 buf1[align + i] = 1 + 23 * i % 127;
71 if (buf1[align + i] == seek_char)
72 buf1[align + i] = seek_char + 1;
74 buf1[align + len] = 0;
78 buf1[align + pos] = seek_char;
79 buf1[align + len] = -seek_char;
80 result = (char *) (buf1 + align + pos);
85 buf1[align + len] = seek_char;
88 FOR_EACH_IMPL (impl, 0)
89 do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
93 do_random_tests (void)
95 size_t i, j, n, align, pos, len;
98 unsigned char *p = buf1 + page_size - 512;
100 for (n = 0; n < ITERATIONS; n++)
102 align = random () & 15;
103 pos = random () & 511;
104 if (pos + align >= 512)
105 pos = 511 - align - (random () & 7);
106 len = random () & 511;
108 len = pos + (random () & 7);
109 if (len + align >= 512)
110 len = 512 - align - (random () & 7);
111 seek_char = random () & 255;
112 j = len + align + 64;
116 for (i = 0; i < j; i++)
118 if (i == pos + align)
122 p[i] = random () & 255;
123 if (p[i] == seek_char)
124 p[i] = seek_char + 13;
129 result = (char *) (p + pos + align);
133 FOR_EACH_IMPL (impl, 1)
134 if (CALL (impl, (char *) (p + align), seek_char, len) != result)
136 error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
137 n, impl->name, align, seek_char, len, pos,
138 CALL (impl, (char *) (p + align), seek_char, len),
153 FOR_EACH_IMPL (impl, 0)
154 printf ("\t%s", impl->name);
157 for (i = 1; i < 8; ++i)
160 do_test (i, i, 0, 0);
161 do_test (i, i, 0, 23);
163 do_test (0, 16 << i, 2048, 23);
164 do_test (i, 64, 256, 23);
165 do_test (0, 16 << i, 2048, 0);
166 do_test (i, 64, 256, 0);
168 do_test (0, i, 256, 23);
169 do_test (0, i, 256, 0);
170 do_test (i, i, 256, 23);
171 do_test (i, i, 256, 0);
174 for (i = 1; i < 32; ++i)
176 do_test (0, i, i + 1, 23);
177 do_test (0, i, i + 1, 0);
178 do_test (i, i, i + 1, 23);
179 do_test (i, i, i + 1, 0);
181 do_test (0, 1, i + 1, 23);
182 do_test (0, 2, i + 1, 0);
183 do_test (i, 1, i + 1, 23);
184 do_test (i, 2, i + 1, 0);
191 #include <support/test-driver.c>