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	bread.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	bread.c (681B)
	---
	1 #include "lib9.h"
	2 #include <bio.h>
	3
	4 long
	5 Bread(Biobuf bp, void ap, long count)
	6 {
	7 long c;
	8 unsigned char *p;
	9 int i, n, ic;
	10
	11 p = ap;
	12 c = count;
	13 ic = bp->icount;
	14
	15 while(c > 0) {
	16 n = -ic;
	17 if(n > c)
	18 n = c;
	19 if(n == 0) {
	20 if(bp->state != Bractive)
	21 break;
	22 i = read(bp->fid, bp->bbuf, bp->bsize);
	23 if(i <= 0) {
	24 bp->state = Bracteof;
	25 if(i < 0)
	26 bp->state = Binactive;
	27 break;
	28 }
	29 bp->gbuf = bp->bbuf;
	30 bp->offset += i;
	31 if(i < bp->bsize) {
	32 memmove(bp->ebuf-i, bp->bbuf, i);
	33 bp->gbuf = bp->ebuf-i;
	34 }
	35 ic = -i;
	36 continue;
	37 }
	38 memmove(p, bp->ebuf+ic, n);
	39 c -= n;
	40 ic += n;
	41 p += n;
	42 }
	43 bp->icount = ic;
	44 return count-c;
	45 }