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	bwrite.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	bwrite.c (553B)
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	1 #include "lib9.h"
	2 #include <bio.h>
	3
	4 long
	5 Bwrite(Biobuf bp, void ap, long count)
	6 {
	7 long c;
	8 unsigned char *p;
	9 int i, n, oc;
	10
	11 p = ap;
	12 c = count;
	13 oc = bp->ocount;
	14
	15 while(c > 0) {
	16 n = -oc;
	17 if(n > c)
	18 n = c;
	19 if(n == 0) {
	20 if(bp->state != Bwactive)
	21 return Beof;
	22 i = write(bp->fid, bp->bbuf, bp->bsize);
	23 if(i != bp->bsize) {
	24 bp->state = Binactive;
	25 return Beof;
	26 }
	27 bp->offset += i;
	28 oc = -bp->bsize;
	29 continue;
	30 }
	31 memmove(bp->ebuf+oc, p, n);
	32 oc += n;
	33 c -= n;
	34 p += n;
	35 }
	36 bp->ocount = oc;
	37 return count-c;
	38 }