95 lines
1.5 KiB
C
95 lines
1.5 KiB
C
#include "lib9.h"
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#include <bio.h>
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void*
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Brdline(Biobuf *bp, int delim)
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{
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char *ip, *ep;
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int i, j;
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i = -bp->icount;
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if(i == 0) {
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/*
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* eof or other error
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*/
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if(bp->state != Bractive) {
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if(bp->state == Bracteof)
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bp->state = Bractive;
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bp->rdline = 0;
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bp->gbuf = bp->ebuf;
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return 0;
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}
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}
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/*
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* first try in remainder of buffer (gbuf doesn't change)
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*/
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ip = (char*)bp->ebuf - i;
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ep = memchr(ip, delim, i);
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if(ep) {
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j = (ep - ip) + 1;
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bp->rdline = j;
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bp->icount += j;
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return ip;
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}
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/*
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* copy data to beginning of buffer
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*/
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if(i < bp->bsize)
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memmove(bp->bbuf, ip, i);
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bp->gbuf = bp->bbuf;
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/*
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* append to buffer looking for the delim
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*/
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ip = (char*)bp->bbuf + i;
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while(i < bp->bsize) {
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j = read(bp->fid, ip, bp->bsize-i);
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if(j <= 0) {
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/*
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* end of file with no delim
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*/
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memmove(bp->ebuf-i, bp->bbuf, i);
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bp->rdline = i;
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bp->icount = -i;
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bp->gbuf = bp->ebuf-i;
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return 0;
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}
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bp->offset += j;
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i += j;
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ep = memchr(ip, delim, j);
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if(ep) {
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/*
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* found in new piece
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* copy back up and reset everything
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*/
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ip = (char*)bp->ebuf - i;
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if(i < bp->bsize){
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memmove(ip, bp->bbuf, i);
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bp->gbuf = (unsigned char*)ip;
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}
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j = (ep - (char*)bp->bbuf) + 1;
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bp->rdline = j;
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bp->icount = j - i;
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return ip;
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}
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ip += j;
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}
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/*
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* full buffer without finding
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*/
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bp->rdline = bp->bsize;
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bp->icount = -bp->bsize;
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bp->gbuf = bp->bbuf;
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return 0;
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}
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int
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Blinelen(Biobuf *bp)
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{
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return bp->rdline;
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}
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