blob: 0614719335eacb8d679973432134d3430b8763df (
plain)
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
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/BuiltinWrappers.h>
#include <assert.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
extern "C" {
void bzero(void* dest, size_t n)
{
memset(dest, 0, n);
}
void bcopy(void const* src, void* dest, size_t n)
{
memmove(dest, src, n);
}
static char foldcase(char ch)
{
if (isalpha(ch))
return tolower(ch);
return ch;
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/strcasecmp.html
int strcasecmp(char const* s1, char const* s2)
{
for (; foldcase(*s1) == foldcase(*s2); ++s1, ++s2) {
if (*s1 == 0)
return 0;
}
return foldcase(*(unsigned char const*)s1) < foldcase(*(unsigned char const*)s2) ? -1 : 1;
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/strncasecmp.html
int strncasecmp(char const* s1, char const* s2, size_t n)
{
if (!n)
return 0;
do {
if (foldcase(*s1) != foldcase(*s2++))
return foldcase(*(unsigned char const*)s1) - foldcase(*(unsigned char const*)--s2);
if (*s1++ == 0)
break;
} while (--n);
return 0;
}
// https://pubs.opengroup.org/onlinepubs/009696799/functions/ffs.html
int ffs(int i)
{
return bit_scan_forward(i);
}
// https://linux.die.net/man/3/ffsl (GNU extension)
int ffsl(long int i)
{
return bit_scan_forward(i);
}
// https://linux.die.net/man/3/ffsll (GNU extension)
int ffsll(long long int i)
{
return bit_scan_forward(i);
}
}
|
