53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <bio.h>
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int32_t
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Bwrite(Biobufhdr *bp, void *ap, int32_t count)
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{
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int32_t c;
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uint8_t *p;
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int i, n, oc;
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char errbuf[ERRMAX];
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p = ap;
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c = count;
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oc = bp->ocount;
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while(c > 0) {
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n = -oc;
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if(n > c)
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n = c;
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if(n == 0) {
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if(bp->state != Bwactive)
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return Beof;
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i = write(bp->fid, bp->bbuf, bp->bsize);
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if(i != bp->bsize) {
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errstr(errbuf, sizeof errbuf);
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if(strstr(errbuf, "interrupt") == nil)
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bp->state = Binactive;
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errstr(errbuf, sizeof errbuf);
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return Beof;
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}
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bp->offset += i;
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oc = -bp->bsize;
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continue;
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}
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memmove(bp->ebuf+oc, p, n);
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oc += n;
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c -= n;
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p += n;
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}
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bp->ocount = oc;
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return count-c;
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}
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