#include "string.h"
#include "arena.h"

char *memset( void *s, int c, int n )
{
	char *p;
	
	p = s;
	while( n > 0 ) {
		*p = c;
		p++;
		n--;
	}
	
	return s;
}

char *strcat( char *d, char *s )
{
	char *p;
	
	for( p = d; *p != '\0'; p++ );
	
	while( *s ) {
		*p = *s;
		p++;
		s++;
	}
	
	*p = '\0';
	
	return d;
}

char *strcat_c( char *s, int c )
{
	char *p;
	
	for( p = s; *p != '\0'; p++ );
	
	*p++ = (char)c;
	*p = '\0';
	
	return s;
}

char *strcpy( char *d, char *s )
{
	char *p;
	
	p = d;
	while( *s ) {
		*p = *s;
		p++;
		s++;
	}
	
	*p = '\0';
	
	return d;		
}

int strlen( char *s )
{
	char *p;
	int len;
	
	p = s;
	len = 0;
	while( *p ) {
		p++;
		len++;
	}
	
	return len;
}

int strcmp( char *s1, char *s2 )
{
	while( *s1 && *s2 && *s1 == *s2 ) {
		s1++; 
		s2++;
	}
	
	return *s1 - *s2;
}

char *strdup( char *s )
{
	char *p;
	
	p = (char *)allocate( strlen( s ) + 1 );
	if( !p ) {
		return 0;
	}
	strcpy( p, s );
	
	return p;
}