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	bgetc.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	---
	bgetc.c (927B)
	---
	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 }