2 * Copyright (C) 2008 Free Software Foundation
3 * Written by Eric Blake and Bruno Haible
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or
8 * (at your option) any later version.
10 * This program 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
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 #define ASSERT(expr) \
30 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
37 /* Calculating void * + int is not portable, so this wrapper converts
38 to char * to make the tests easier to write. */
39 #define MEMCHR (char *) memchr
45 char *input = malloc (n);
50 memset (input + 2, 'c', 1024);
51 memset (input + 1026, 'd', n - 1028);
55 /* Basic behavior tests. */
56 ASSERT (MEMCHR (input, 'a', n) == input);
58 ASSERT (MEMCHR (input, 'a', 0) == NULL);
59 ASSERT (MEMCHR (NULL, 'a', 0) == NULL);
61 ASSERT (MEMCHR (input, 'b', n) == input + 1);
62 ASSERT (MEMCHR (input, 'c', n) == input + 2);
63 ASSERT (MEMCHR (input, 'd', n) == input + 1026);
65 ASSERT (MEMCHR (input + 1, 'a', n - 1) == input + n - 1);
66 ASSERT (MEMCHR (input + 1, 'e', n - 1) == input + n - 2);
68 ASSERT (MEMCHR (input, 'f', n) == NULL);
69 ASSERT (MEMCHR (input, '\0', n) == NULL);
71 /* Check that a very long haystack is handled quickly if the byte is
72 found near the beginning. */
74 size_t repeat = 10000;
75 for (; repeat > 0; repeat--)
77 ASSERT (MEMCHR (input, 'c', n) == input + 2);
81 /* Alignment tests. */
84 for (i = 0; i < 32; i++)
86 for (j = 0; j < 256; j++)
88 for (j = 0; j < 256; j++)
90 ASSERT (MEMCHR (input + i, j, 256) == input + i + j);