int
replace( struct proc *p, void *v, register_t *retval )
{
/*      Replaces every occurance of from with to.
        Return's pos */


	int err,
		size,
		i;

	struct replace_args *params = v;

	char  	newstring[MAX_STR_LENGTH+1],
			from,
			to;

	err = copyinstr( SCARG(params, string), &newstring, MAX_STR_LENGTH, &size );
	if (err == EFAULT)
	    return( err );

	from = SCARG(params, from);
	to = SCARG(params, to);


	for(i=0; i<size; i++)
	{
                if(newstring[i] == from)
                        newstring[i] = to;

    }

	copyoutstr(newstring, retval, MAX_STR_LENGTH+1, &size );
    return (0);

}