#include <u.h>#include <libc.h>#include <bio.h>#include "String.h" enum{	Minread=	256,}; /* Append up to 'len' input bytes to the string 'to'. * * Returns the number of characters read. */ extern ints_read(Biobuf *fp, String *to, int len){	int rv;	int n; 	if(to->ref > 1)		sysfatal("can't s_read a shared string");	for(rv = 0; rv < len; rv += n){		n = to->end - to->ptr;		if(n < Minread){			s_grow(to, Minread);			n = to->end - to->ptr;		}		if(n > len - rv)			n = len - rv;		n = Bread(fp, to->ptr, n);		if(n <= 0)			break;		to->ptr += n;	}	s_terminate(to);	return rv;}