/*  * 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> void*Brdline(Biobufhdr *bp, int delim){	char *ip, *ep;	int i, j; 	i = -bp->icount;	if(i == 0) {		/*		 * eof or other error		 */		if(bp->state != Bractive) {			if(bp->state == Bracteof)				bp->state = Bractive;			bp->rdline = 0;			bp->gbuf = bp->ebuf;			return 0;		}	} 	/*	 * first try in remainder of buffer (gbuf doesn't change)	 */	ip = (char*)bp->ebuf - i;	ep = memchr(ip, delim, i);	if(ep) {		j = (ep - ip) + 1;		bp->rdline = j;		bp->icount += j;		return ip;	} 	/*	 * copy data to beginning of buffer	 */	if(i < bp->bsize)		memmove(bp->bbuf, ip, i);	bp->gbuf = bp->bbuf; 	/*	 * append to buffer looking for the delim	 */	ip = (char*)bp->bbuf + i;	while(i < bp->bsize) {		j = read(bp->fid, ip, bp->bsize-i);		if(j <= 0) {			/*			 * end of file with no delim			 */			memmove(bp->ebuf-i, bp->bbuf, i);			bp->rdline = i;			bp->icount = -i;			bp->gbuf = bp->ebuf-i;			return 0;		}		bp->offset += j;		i += j;		ep = memchr(ip, delim, j);		if(ep) {			/*			 * found in new piece			 * copy back up and reset everything			 */			ip = (char*)bp->ebuf - i;			if(i < bp->bsize){				memmove(ip, bp->bbuf, i);				bp->gbuf = (uchar*)ip;			}			j = (ep - (char*)bp->bbuf) + 1;			bp->rdline = j;			bp->icount = j - i;			return ip;		}		ip += j;	} 	/*	 * full buffer without finding	 */	bp->rdline = bp->bsize;	bp->icount = -bp->bsize;	bp->gbuf = bp->bbuf;	return 0;} intBlinelen(Biobufhdr *bp){ 	return bp->rdline;}