tmake sure a write of 0 bytes does a 0-length write. - plan9port - [fork] Plan 9 from user space
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       ---
 (DIR) commit 493f3d0fbf548303a8f468ffffca8476607ee2cd
 (DIR) parent 298f6bd657fd2c0cd6c1fc049be9e2a139e2ae05
 (HTM) Author: rsc <devnull@localhost>
       Date:   Fri, 22 Oct 2004 17:14:17 +0000
       
       make sure a write of 0 bytes does a 0-length write.
       
       Diffstat:
         M src/libfs/write.c                   |       6 ++++--
       
       1 file changed, 4 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/src/libfs/write.c b/src/libfs/write.c
       t@@ -43,16 +43,18 @@ _fspwrite(Fid *fid, void *buf, long n, vlong offset)
        long
        fspwrite(Fid *fid, void *buf, long n, vlong offset)
        {
       -        long tot, want, got;
       +        long tot, want, got, first;
                uint msize;
        
                msize = fid->fs->msize - IOHDRSZ;
                tot = 0;
       -        while(tot < n){
       +        first = 1;
       +        while(tot < n || first){
                        want = n - tot;
                        if(want > msize)
                                want = msize;
                        got = _fspwrite(fid, buf, want, offset);
       +                first = 0;
                        if(got < 0){
                                if(tot == 0)
                                        return got;