/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <bio.h>#include <ip.h>#include <plumb.h>#include <thread.h>#include <fcall.h>#include <9p.h>#include "dat.h"#include "fns.h" voidinitibuf(Ibuf *b, Ioproc *io, int fd){	b->fd = fd;	b->io = io;	b->rp = b->wp = b->buf;} intreadibuf(Ibuf *b, char *buf, int len){	int n; 	n = b->wp - b->rp;	if(n > 0){		if(n > len)			n = len;		memmove(buf, b->rp, n);		b->rp += n;		return n;	}	return ioreadn(b->io, b->fd, buf, len);} voidunreadline(Ibuf *b, char *line){	int i, n; 	i = strlen(line);	n = b->wp - b->rp;	memmove(&b->buf[i+1], b->rp, n);	memmove(b->buf, line, i);	b->buf[i] = '\n';	b->rp = b->buf;	b->wp = b->rp+i+1+n;} intreadline(Ibuf *b, char *buf, int len){	int n;	char *p; 	len--; 	for(p = buf;;){		if(b->rp >= b->wp){			n = ioread(b->io, b->fd, b->wp, sizeof(b->buf)/2);			if(n < 0)				return -1;			if(n == 0)				break;			b->wp += n;		}		n = *b->rp++;		if(len > 0){			*p++ = n;			len--;		}		if(n == '\n')			break;	} 	/* drop trailing white */	for(;;){		if(p <= buf)			break;		n = *(p-1);		if(n != ' ' && n != '\t' && n != '\r' && n != '\n')			break;		p--;	} 	*p = 0;	return p-buf;}