1 b2cfc4e2 2003-09-30 devnull #include "lib9.h"
2 b2cfc4e2 2003-09-30 devnull #include <bio.h>
5 b2cfc4e2 2003-09-30 devnull Bgetc(Biobuf *bp)
10 b2cfc4e2 2003-09-30 devnull i = bp->icount;
11 b2cfc4e2 2003-09-30 devnull if(i != 0) {
12 b2cfc4e2 2003-09-30 devnull bp->icount = i+1;
13 b2cfc4e2 2003-09-30 devnull return bp->ebuf[i];
15 b2cfc4e2 2003-09-30 devnull if(bp->state != Bractive) {
16 b2cfc4e2 2003-09-30 devnull if(bp->state == Bracteof)
17 b2cfc4e2 2003-09-30 devnull bp->state = Bractive;
18 b2cfc4e2 2003-09-30 devnull return Beof;
21 b2cfc4e2 2003-09-30 devnull * get next buffer, try to keep Bungetsize
22 b2cfc4e2 2003-09-30 devnull * characters pre-catenated from the previous
23 b2cfc4e2 2003-09-30 devnull * buffer to allow that many ungets.
25 b2cfc4e2 2003-09-30 devnull memmove(bp->bbuf-Bungetsize, bp->ebuf-Bungetsize, Bungetsize);
26 b2cfc4e2 2003-09-30 devnull i = read(bp->fid, bp->bbuf, bp->bsize);
27 b2cfc4e2 2003-09-30 devnull bp->gbuf = bp->bbuf;
28 b2cfc4e2 2003-09-30 devnull if(i <= 0) {
29 4dd07e01 2004-12-28 devnull bp->state = Bracteof;
30 b2cfc4e2 2003-09-30 devnull if(i < 0)
31 b2cfc4e2 2003-09-30 devnull bp->state = Binactive;
32 b2cfc4e2 2003-09-30 devnull return Beof;
34 b2cfc4e2 2003-09-30 devnull if(i < bp->bsize) {
35 b2cfc4e2 2003-09-30 devnull memmove(bp->ebuf-i-Bungetsize, bp->bbuf-Bungetsize, i+Bungetsize);
36 b2cfc4e2 2003-09-30 devnull bp->gbuf = bp->ebuf-i;
38 b2cfc4e2 2003-09-30 devnull bp->icount = -i;
39 b2cfc4e2 2003-09-30 devnull bp->offset += i;
40 b2cfc4e2 2003-09-30 devnull goto loop;
44 b2cfc4e2 2003-09-30 devnull Bungetc(Biobuf *bp)
47 b2cfc4e2 2003-09-30 devnull if(bp->state == Bracteof)
48 b2cfc4e2 2003-09-30 devnull bp->state = Bractive;
49 b2cfc4e2 2003-09-30 devnull if(bp->state != Bractive)
50 b2cfc4e2 2003-09-30 devnull return Beof;
51 b2cfc4e2 2003-09-30 devnull bp->icount--;
52 b2cfc4e2 2003-09-30 devnull return 1;