#include	"u.h"#include	"lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"io.h" voidinitq(IOQ *q){	lock(q);	unlock(q);	q->in = q->out = q->buf;	q->puts = puts;	q->putc = putc;} intputc(IOQ *q, int c){	uchar *nextin;	if(q->in >= &q->buf[sizeof(q->buf)-1])		nextin = q->buf;	else		nextin = q->in+1;	if(nextin == q->out)		return -1;	*q->in = c;	q->in = nextin;	return 0;} intgetc(IOQ *q){	int c; 	if(q->in == q->out)		return -1;	c = *q->out;	if(q->out == q->buf+sizeof(q->buf)-1)		q->out = q->buf;	else		q->out++;	return c;} voidputs(IOQ *q, void *buf, int n){	int m; uchar *nextin;	uchar *s = buf; 	while(n){		m = q->out - q->in - 1;		if(m < 0)			m = &q->buf[NQ] - q->in;		if(m == 0)			break;		if(m > n)			m = n;		memmove(q->in, s, m);		n -= m;		s += m;		nextin = q->in + m;		if(nextin >= &q->buf[NQ])			q->in = q->buf;		else			q->in = nextin;	}} intgets(IOQ *q, void *buf, int n){	int m, k = 0; uchar *nextout;	uchar *s = buf; 	while(n){		m = q->in - q->out;		if(m < 0)			m = &q->buf[NQ] - q->out;		if(m == 0)			return k;		if(m > n)			m = n;		memmove(s, q->out, m);		s += m;		k += m;		n -= m;		nextout = q->out + m;		if(nextout >= &q->buf[NQ])			q->out = q->buf;		else			q->out = nextout;	}	return k;} intcangetc(void *arg){	IOQ *q = (IOQ *)arg;	int n = q->in - q->out;	if (n < 0)		n += sizeof(q->buf);	return n;} intcanputc(void *arg){	IOQ *q = (IOQ *)arg;	return sizeof(q->buf)-cangetc(q)-1;}