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* fhandler.cc (fhandler_base::open): Always add GENERIC_READ access

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when opening raw disk devices.
        * fhandler_floppy.cc (fhandler_dev_floppy::lseek): Implement bytewise
        access.
        * fhandler_raw.cc (fhandler_dev_raw::open): Always open raw disk device
        binary.
        (fhandler_dev_raw::raw_write): Don't drop read buffer content when
        writing after read.
This commit is contained in:
Corinna Vinschen
2001-02-05 16:10:06 +00:00
parent cada03f92f
commit ae9b22c69b
4 changed files with 101 additions and 6 deletions
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79
winsup/cygwin/fhandler_floppy.cc
View File

@@ -15,6 +15,7 @@ details. */
#include <errno.h>
#include <unistd.h>
#include "fhandler.h"
#include "cygerrno.h"
/**********************************************************************/
/* fhandler_dev_floppy */
@@ -78,9 +79,81 @@ fhandler_dev_floppy::close (void)
off_t
fhandler_dev_floppy::lseek (off_t offset, int whence)
{
/* FIXME: Need to implement better. */
offset = (offset / 512) * 512;
return fhandler_base::lseek (offset, whence);
int ret;
DWORD off;
char buf[512];
if (whence == SEEK_SET)
{
if (offset < 0)
{
set_errno (EINVAL);
return -1;
}
/* Invalidate buffer. */
ret = writebuf ();
if (ret)
return ret;
devbufstart = devbufend = 0;
off = (offset / 512) * 512;
if (SetFilePointer (get_handle (), off, NULL, FILE_BEGIN)
== INVALID_SET_FILE_POINTER)
{
__seterrno ();
return -1;
}
return raw_read (buf, offset - off);
}
else if (whence == SEEK_CUR)
{
DWORD low;
LONG high = 0;
low = SetFilePointer (get_handle (), 0, &high, FILE_CURRENT);
if (low == INVALID_SET_FILE_POINTER && GetLastError ())
{
__seterrno ();
return -1;
}
long long cur = (long long) high << 32 + low;
if (is_writing)
cur += devbufend - devbufstart;
else
cur -= devbufend - devbufstart;
/* Invalidate buffer. */
ret = writebuf ();
if (ret)
return ret;
devbufstart = devbufend = 0;
cur += offset;
if (cur < 0)
{
set_errno (EINVAL);
return -1;
}
long long set = (cur / 512) * 512;
high = set >> 32;
low = set & 0xffffffff;
off = cur - set;
low = SetFilePointer (get_handle (), low, &high, FILE_BEGIN);
if (low == INVALID_SET_FILE_POINTER && GetLastError ())
{
__seterrno ();
return -1;
}
return raw_read (buf, off);
}
/* SEEK_END is not supported on raw disk devices. */
set_errno (EINVAL);
return -1;
}
int