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bgetc.c - 9base - revived minimalist port of Plan 9 userland to Unix
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bgetc.c (927B)
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1 #include "lib9.h"
2 #include <bio.h>
3
4 int
5 Bgetc(Biobuf *bp)
6 {
7 int i;
8
9 loop:
10 i = bp->icount;
11 if(i != 0) {
12 bp->icount = i+1;
13 return bp->ebuf[i];
14 }
15 if(bp->state != Bractive) {
16 if(bp->state == Bracteof)
17 bp->state = Bractive;
18 return Beof;
19 }
20 /*
21 * get next buffer, try to keep Bungetsize
22 * characters pre-catenated from the previous
23 * buffer to allow that many ungets.
24 */
25 memmove(bp->bbuf-Bungetsize, bp->ebuf-Bungetsize, Bungetsize);
26 i = read(bp->fid, bp->bbuf, bp->bsize);
27 bp->gbuf = bp->bbuf;
28 if(i <= 0) {
29 bp->state = Bracteof;
30 if(i < 0)
31 bp->state = Binactive;
32 return Beof;
33 }
34 if(i < bp->bsize) {
35 memmove(bp->ebuf-i-Bungetsize, bp->bbuf-Bungetsize, i+Bu…
36 bp->gbuf = bp->ebuf-i;
37 }
38 bp->icount = -i;
39 bp->offset += i;
40 goto loop;
41 }
42
43 int
44 Bungetc(Biobuf *bp)
45 {
46
47 if(bp->state == Bracteof)
48 bp->state = Bractive;
49 if(bp->state != Bractive)
50 return Beof;
51 bp->icount--;
52 return 1;
53 }
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