src/string.c


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

#include "string.h"

void *memset( void *s, int c, size_t n )
{
	for( size_t i = 0; i < n; i++ ) {
		((char *)s)[i] = c;
	}
	
	return s;
}

void *memmove( void *d, const void *s, size_t n )
{
	const char *ss = (const char *)s;
	char *dd = (char *)d;
	
	if( dd == ss ) return d;
	
	if( dd <= ss ) {
		while( n-- ) {
			*dd++ = *ss++;
		}
	} else {
		dd += n;
		ss += n;
		while( n-- ) {
			*--dd = *--ss;
		}
	}
	
	return d;
}

size_t strlen( const char *s )
{
	size_t len;
	const char *p = s;
	
	for( len = 0; *p; len++, p++ );
	
	return len;
}