2 * Copyright (C) 2008-2009 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/>. */
22 #include "signature.h"
23 SIGNATURE_CHECK (memchr, void *, (void const *, int, size_t));
28 #include "zerosize-ptr.h"
30 #define ASSERT(expr) \
35 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
42 /* Calculating void * + int is not portable, so this wrapper converts
43 to char * to make the tests easier to write. */
44 #define MEMCHR (char *) memchr
50 char *input = malloc (n);
55 memset (input + 2, 'c', 1024);
56 memset (input + 1026, 'd', n - 1028);
60 /* Basic behavior tests. */
61 ASSERT (MEMCHR (input, 'a', n) == input);
63 ASSERT (MEMCHR (input, 'a', 0) == NULL);
64 ASSERT (MEMCHR (zerosize_ptr (), 'a', 0) == NULL);
66 ASSERT (MEMCHR (input, 'b', n) == input + 1);
67 ASSERT (MEMCHR (input, 'c', n) == input + 2);
68 ASSERT (MEMCHR (input, 'd', n) == input + 1026);
70 ASSERT (MEMCHR (input + 1, 'a', n - 1) == input + n - 1);
71 ASSERT (MEMCHR (input + 1, 'e', n - 1) == input + n - 2);
73 ASSERT (MEMCHR (input, 'f', n) == NULL);
74 ASSERT (MEMCHR (input, '\0', n) == NULL);
76 /* Check that a very long haystack is handled quickly if the byte is
77 found near the beginning. */
79 size_t repeat = 10000;
80 for (; repeat > 0; repeat--)
82 ASSERT (MEMCHR (input, 'c', n) == input + 2);
86 /* Alignment tests. */
89 for (i = 0; i < 32; i++)
91 for (j = 0; j < 256; j++)
93 for (j = 0; j < 256; j++)
95 ASSERT (MEMCHR (input + i, j, 256) == input + i + j);
100 /* Check that memchr() does not read past the first occurrence of the
101 byte being searched. See the Austin Group's clarification
102 <http://www.opengroup.org/austin/docs/austin_454.txt>. */
104 char *page_boundary = (char *) zerosize_ptr ();
106 if (page_boundary != NULL)
108 for (n = 1; n <= 500; n++)
110 char *mem = page_boundary - n;
111 memset (mem, 'X', n);
112 ASSERT (MEMCHR (mem, 'U', n) == NULL);
117 for (i = 0; i < n; i++)
120 ASSERT (MEMCHR (mem, 'U', 4000) == mem + i);