Subversion Repositories planix.SVN

#include        <u.h>
#include        <libc.h>
#include        <bio.h>

long
Bwrite(Biobufhdr *bp, void *ap, long count)
{
        long c;
        uchar *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;
}