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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <ip.h>
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#include <plumb.h>
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#include <thread.h>
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#include <fcall.h>
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#include <9p.h>
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#include "dat.h"
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#include "fns.h"
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void
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initibuf(Ibuf *b, Ioproc *io, int fd)
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{
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	b->fd = fd;
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	b->io = io;
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	b->rp = b->wp = b->buf;
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}
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int
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readibuf(Ibuf *b, char *buf, int len)
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{
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	int n;
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	n = b->wp - b->rp;
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	if(n > 0){
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		if(n > len)
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			n = len;
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		memmove(buf, b->rp, n);
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		b->rp += n;
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		return n;
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	}
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	return ioreadn(b->io, b->fd, buf, len);
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}
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void
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unreadline(Ibuf *b, char *line)
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{
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	int i, n;
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	i = strlen(line);
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	n = b->wp - b->rp;
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	memmove(&b->buf[i+1], b->rp, n);
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	memmove(b->buf, line, i);
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	b->buf[i] = '\n';
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	b->rp = b->buf;
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	b->wp = b->rp+i+1+n;
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}
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int
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readline(Ibuf *b, char *buf, int len)
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{
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	int n;
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	char *p;
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	len--;
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	for(p = buf;;){
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		if(b->rp >= b->wp){
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			n = ioread(b->io, b->fd, b->wp, sizeof(b->buf)/2);
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			if(n < 0)
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				return -1;
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			if(n == 0)
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				break;
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			b->wp += n;
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		}
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		n = *b->rp++;
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		if(len > 0){
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			*p++ = n;
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			len--;
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		}
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		if(n == '\n')
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			break;
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	}
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	/* drop trailing white */
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	for(;;){
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		if(p <= buf)
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			break;
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		n = *(p-1);
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		if(n != ' ' && n != '\t' && n != '\r' && n != '\n')
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			break;
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		p--;
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	}
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	*p = 0;
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	return p-buf;
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}
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