void*

#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 = bp->iof(bp, ip, bp->bsize-i);
if(j < 0)
Berror(bp, "read error: %r");
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;
}

int
Blinelen(Biobufhdr *bp)
{

return bp->rdline;
}