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.
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 /* Also check the generic implementation. */
28 #undef weak_alias
29 #define weak_alias(a, b)
30 #define MEMRCHR __memrchr_default
31 #include "string/memrchr.c"
32 IMPL (__memrchr_default, 1)
33
34 /* Naive implementation to verify results. */
35 char *
36 simple_memrchr (const char *s, int c, size_t n)
37 {
38 s = s + n;
39 while (n--)
40 if (*--s == (char) c)
41 return (char *) s;
42 return NULL;
43 }
44
45 static void
46 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
47 {
48 char *res = CALL (impl, s, c, n);
49 if (res != exp_res)
50 {
51 error (0, 0, "Wrong result in function %s %p %p", impl->name,
52 res, exp_res);
53 ret = 1;
54 return;
55 }
56 }
57
58 static void
59 do_test (size_t align, size_t pos, size_t len, int seek_char)
60 {
61 size_t i;
62 char *result;
63
64 align &= 7;
65 if (align + len >= page_size)
66 return;
67
68 for (i = 0; i < len; ++i)
69 {
70 buf1[align + i] = 1 + 23 * i % 127;
71 if (buf1[align + i] == seek_char)
72 buf1[align + i] = seek_char + 1;
73 }
74 buf1[align + len] = 0;
75
76 if (pos < len)
77 {
78 buf1[align + pos] = seek_char;
79 buf1[align + len] = -seek_char;
80 result = (char *) (buf1 + align + pos);
81 }
82 else
83 {
84 result = NULL;
85 buf1[align + len] = seek_char;
86 }
87
88 FOR_EACH_IMPL (impl, 0)
89 do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
90 }
91
92 static void
93 do_random_tests (void)
94 {
95 size_t i, j, n, align, pos, len;
96 int seek_char;
97 char *result;
98 unsigned char *p = buf1 + page_size - 512;
99
100 for (n = 0; n < ITERATIONS; n++)
101 {
102 align = random () & 15;
103 pos = random () & 511;
104 if (pos + align >= 512)
105 pos = 511 - align - (random () & 7);
106 len = random () & 511;
107 if (pos >= len)
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;
113 if (j > 512)
114 j = 512;
115
116 for (i = 0; i < j; i++)
117 {
118 if (i == pos + align)
119 p[i] = seek_char;
120 else
121 {
122 p[i] = random () & 255;
123 if (p[i] == seek_char)
124 p[i] = seek_char + 13;
125 }
126 }
127
128 if (pos < len)
129 result = (char *) (p + pos + align);
130 else
131 result = NULL;
132
133 FOR_EACH_IMPL (impl, 1)
134 if (CALL (impl, (char *) (p + align), seek_char, len) != result)
135 {
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),
139 result, p);
140 ret = 1;
141 }
142 }
143 }
144
145 int
146 test_main (void)
147 {
148 size_t i;
149
150 test_init ();
151
152 printf ("%20s", "");
153 FOR_EACH_IMPL (impl, 0)
154 printf ("\t%s", impl->name);
155 putchar ('\n');
156
157 for (i = 1; i < 8; ++i)
158 {
159 /* Test len == 0. */
160 do_test (i, i, 0, 0);
161 do_test (i, i, 0, 23);
162
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);
167
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);
172
173 }
174 for (i = 1; i < 32; ++i)
175 {
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);
180
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);
185 }
186
187 do_random_tests ();
188 return ret;
189 }
190
191 #include <support/test-driver.c>