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Bugzilla bug #70765: added more comments and use the byte count returned

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by WriteFile as opposed to the len argument, just in case WriteFile writes
fewer bytes than requested.
This commit is contained in:
wtc%netscape.com 2001-05-05 04:59:38 +00:00
parent 533d5bad5b
commit bcaa5cf548
1 changed files with 9 additions and 3 deletions
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12
nsprpub/pr/src/md/windows/ntio.c
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@ -2329,7 +2329,7 @@ _PR_MD_WRITE(PRFileDesc *fd, void *buf, PRInt32 len)
int rv, err;
LONG hiOffset = 0;
LONG loOffset;
LARGE_INTEGER offset; /* use for a normalized add of len to offset */
LARGE_INTEGER offset; /* use for the calculation of the new offset */
if (!fd->secret->md.sync_file_io) {
PRThread *me = _PR_MD_CURRENT_THREAD();
@ -2434,10 +2434,16 @@ _PR_MD_WRITE(PRFileDesc *fd, void *buf, PRInt32 len)
return -1;
}
/* add, normalized, len to the initial file offset for new offset */
/*
* Moving the file pointer by a relative offset (FILE_CURRENT)
* does not work with a file on a network drive exported by a
* Win2K system. We still don't know why. A workaround is to
* move the file pointer by an absolute offset (FILE_BEGIN).
* (Bugzilla bug 70765)
*/
offset.LowPart = me->md.overlapped.overlapped.Offset;
offset.HighPart = me->md.overlapped.overlapped.OffsetHigh;
offset.QuadPart += len;
offset.QuadPart += me->md.blocked_io_bytes;
SetFilePointer((HANDLE)f, offset.LowPart, &offset.HighPart, FILE_BEGIN);