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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <bio.h>
- int32_t
- Bwrite(Biobufhdr *bp, void *ap, int32_t count)
- {
- int32_t c;
- uint8_t *p;
- int i, n, oc;
- char errbuf[ERRMAX];
- p = ap;
- c = count;
- oc = bp->ocount;
- while(c > 0) {
- n = -oc;
- if(n > c)
- n = c;
- if(n == 0) {
- if(bp->state != Bwactive)
- return Beof;
- i = write(bp->fid, bp->bbuf, bp->bsize);
- if(i != bp->bsize) {
- errstr(errbuf, sizeof errbuf);
- if(strstr(errbuf, "interrupt") == nil)
- bp->state = Binactive;
- errstr(errbuf, sizeof errbuf);
- return Beof;
- }
- bp->offset += i;
- oc = -bp->bsize;
- continue;
- }
- memmove(bp->ebuf+oc, p, n);
- oc += n;
- c -= n;
- p += n;
- }
- bp->ocount = oc;
- return count-c;
- }
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