1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
#ifndef TEST
void *
libsimple_memelem(const void *hay_, size_t hayn, const void *sub_, size_t subn)
{
if (!subn)
return (void *)hay_;
switch (subn) {
case 1:
return memchr(hay_, hayn, *(char *)sub_);
case 2:
{
uint16_t *hay = (void *)hay_;
uint16_t sub = *(uint16_t *)sub_;
for (; hayn--; hay++)
if (*hay == sub)
return hay;
break;
}
case 4:
{
uint32_t *hay = (void *)hay_;
uint32_t sub = *(uint32_t *)sub_;
for (; hayn--; hay++)
if (*hay == sub)
return hay;
break;
}
case 8:
{
uint64_t *hay = (void *)hay_;
uint64_t sub = *(uint64_t *)sub_;
for (; hayn--; hay++)
if (*hay == sub)
return hay;
break;
}
default:
{
char *hay = (void *)hay_;
const char *sub = sub_;
for (; hayn--; hay += subn)
if (!memcmp(hay, sub, subn))
return hay;
break;
}
}
return NULL;
}
#else
#include "test.h"
int
main(void)
{
assert(!strcmpnul(libsimple_memelem("12345634", 4, "", 0), "12345634"));
assert(!strcmpnul(libsimple_memelem("12345634", 4, "34", 2), "345634"));
assert(!libsimple_memelem("12345634", 4, "xx", 2));
assert(!libsimple_memelem("13456342", 4, "34", 2));
assert(!libsimple_memelem("12345634", 0, "34", 2));
assert(!strcmpnul(libsimple_memelem("12345634", 0, "34", 0), "12345634"));
return 0;
}
#endif
|
