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#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 > 0 ) {
*dd++ = *ss++;
n--;
}
} else {
dd += n;
ss += n;
while( n > 0 ) {
*--dd = *--ss;
n--;
}
}
return d;
}
void *memcpy( void *d, const void *s, size_t n )
{
const char *ss = (const char *)s;
char *dd = (char *)d;
if( dd == ss ) return d;
while( n > 0 ) {
*dd++ = *ss++;
n--;
}
return d;
}
size_t strlen( const char *s )
{
size_t len;
const char *p = s;
for( len = 0; *p; len++, p++ );
return len;
}
int strcmp( const char *s1, const char *s2 )
{
while( *s1 && *s2 && *s1 == *s2 ) {
s1++;
s2++;
}
return *s1 - *s2;
}
size_t strlcpy( char *d, const char *s, size_t n )
{
size_t len = 0;
while( len < n && s[len] != '\0' ) {
d[len] = s[len];
len++;
}
d[len] = '\0';
while( s[len] != '\0' ) {
len++;
}
if( len >= n ) {
d[n-1] = '\0';
}
return len;
}
size_t strlcat( char *d, const char *s, size_t n )
{
size_t len = 0;
const char *ss = s;
char *dd = d;
while( len < n && *dd != '\0' ) {
len++;
dd++;
}
if( len == n ) {
return len + strlen( s );
}
while( len + 1 < n && ( *dd++ = *ss++ ) ) {
len++;
}
*dd = '\0';
return len;
}
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