2 * Copyright (C) 2008 Free Software Foundation
3 * Written by Eric Blake
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/>. */
26 #define ASSERT(expr) \
31 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
41 char *input = malloc (n);
46 memset (input + 2, 'c', 1024);
47 memset (input + 1026, 'd', n - 1028);
51 ASSERT (memchr2 (input, 'a', 'b', n) == input);
52 ASSERT (memchr2 (input, 'b', 'a', n) == input);
54 ASSERT (memchr2 (input, 'a', 'b', 0) == NULL);
55 ASSERT (memchr2 (NULL, 'a', 'b', 0) == NULL);
57 ASSERT (memchr2 (input, 'b', 'd', n) == input + 1);
58 ASSERT (memchr2 (input + 2, 'b', 'd', n - 2) == input + 1026);
60 ASSERT (memchr2 (input, 'd', 'e', n) == input + 1026);
61 ASSERT (memchr2 (input, 'e', 'd', n) == input + 1026);
63 ASSERT (memchr2 (input + 1, 'a', 'e', n - 1) == input + n - 2);
64 ASSERT (memchr2 (input + 1, 'e', 'a', n - 1) == input + n - 2);
66 ASSERT (memchr2 (input, 'f', 'g', n) == NULL);
67 ASSERT (memchr2 (input, 'f', '\0', n) == NULL);
69 ASSERT (memchr2 (input, 'a', 'a', n) == input);
70 ASSERT (memchr2 (input + 1, 'a', 'a', n - 1) == input + n - 1);
71 ASSERT (memchr2 (input, 'f', 'f', n) == NULL);
73 /* Check that a very long haystack is handled quickly if one of the
74 two bytes is found near the beginning. */
76 size_t repeat = 10000;
77 for (; repeat > 0; repeat--)
79 ASSERT (memchr2 (input, 'c', 'e', n) == input + 2);
80 ASSERT (memchr2 (input, 'e', 'c', n) == input + 2);
81 ASSERT (memchr2 (input, 'c', '\0', n) == input + 2);
82 ASSERT (memchr2 (input, '\0', 'c', n) == input + 2);