1 /* Test and measure memmem functions.
2 Copyright (C) 2008-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2008.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
21 #define TEST_NAME "memmem"
23 #define ITERATIONS 500
24 #include "test-string.h"
26 typedef char *(*proto_t) (const void *, size_t, const void *, size_t);
27 void *simple_memmem (const void *, size_t, const void *, size_t);
29 IMPL (simple_memmem, 0)
33 simple_memmem (const void *haystack, size_t haystack_len, const void *needle,
37 const char *const last_possible
38 = (const char *) haystack + haystack_len - needle_len;
41 /* The first occurrence of the empty string is deemed to occur at
42 the beginning of the string. */
43 return (void *) haystack;
45 /* Sanity check, otherwise the loop might search through the whole
47 if (__glibc_unlikely (haystack_len < needle_len))
50 for (begin = (const char *) haystack; begin <= last_possible; ++begin)
51 if (begin[0] == ((const char *) needle)[0] &&
52 !memcmp ((const void *) &begin[1],
53 (const void *) ((const char *) needle + 1),
55 return (void *) begin;
61 check_result (impl_t *impl, const void *haystack, size_t haystack_len,
62 const void *needle, size_t needle_len, const void *expected)
66 res = CALL (impl, haystack, haystack_len, needle, needle_len);
69 error (0, 0, "Wrong result in function %s %p %p", impl->name,
79 do_one_test (impl_t *impl, const void *haystack, size_t haystack_len,
80 const void *needle, size_t needle_len, const void *expected)
82 if (check_result (impl, haystack, haystack_len, needle, needle_len,
88 do_test (const char *str, size_t len, size_t idx)
92 memcpy (tmpbuf, buf1 + idx, len);
93 memcpy (buf1 + idx, str, len);
95 FOR_EACH_IMPL (impl, 0)
96 do_one_test (impl, buf1, BUF1PAGES * page_size, str, len, buf1 + idx);
98 memcpy (buf1 + idx, tmpbuf, len);
102 do_random_tests (void)
104 for (size_t n = 0; n < ITERATIONS; ++n)
108 size_t shift = random () % 11;
109 size_t rel = random () % ((2 << (shift + 1)) * 64);
110 size_t idx = MIN ((2 << shift) * 64 + rel, BUF1PAGES * page_size - 2);
111 size_t len = random () % (sizeof (tmpbuf) - 1) + 1;
112 len = MIN (len, BUF1PAGES * page_size - idx - 1);
113 memcpy (tmpbuf, buf1 + idx, len);
114 for (size_t i = random () % len / 2 + 1; i > 0; --i)
116 size_t off = random () % len;
117 char ch = '0' + random () % 10;
119 buf1[idx + off] = ch;
122 FOR_EACH_IMPL (impl, 0)
123 do_one_test (impl, buf1, BUF1PAGES * page_size, buf1 + idx, len,
126 memcpy (buf1 + idx, tmpbuf, len);
134 const char search_buf_data[5] = { 0x56, 0x34, 0x12, 0x78, 0x78 };
135 const char pattern[2] = { 0x78, 0x56 };
136 void *search_buf = (void *) buf1 + page_size - sizeof search_buf_data;
139 memcpy (search_buf, search_buf_data, sizeof search_buf_data);
140 exp_result = simple_memmem (search_buf, sizeof search_buf_data,
141 pattern, sizeof pattern);
142 FOR_EACH_IMPL (impl, 0)
143 check_result (impl, search_buf, sizeof search_buf_data,
144 pattern, sizeof pattern, exp_result);
147 static const char *const strs[] =
149 "00000", "00112233", "0123456789", "0000111100001111",
150 "00000111110000022222", "012345678901234567890",
151 "abc0", "aaaa0", "abcabc0"
165 FOR_EACH_IMPL (impl, 0)
166 printf ("\t%s", impl->name);
169 for (i = 0; i < BUF1PAGES * page_size; ++i)
170 buf1[i] = 60 + random () % 32;
172 for (i = 0; i < sizeof (strs) / sizeof (strs[0]); ++i)
173 for (size_t j = 0; j < 120; j += 7)
175 size_t len = strlen (strs[i]);
177 do_test (strs[i], len, j);
184 #include "../test-skeleton.c"