* fhandler_floppy.cc (fhandler_dev_floppy::lseek): Remove lloffset.

	Use offset directly.  Add shortcut for lseek(fd, 0, SEEK_CUR) case.
	(fhandler_dev_floppy::ioctl): Drop wrong RDSETBLK case.
	* fhandler_raw.cc (fhandler_dev_raw::ioctl): Revamp RDSETBLK code.

3 files changed, 34 insertions, 38 deletions

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index a466259..aa98868 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,10 @@
+2012-10-16  Corinna Vinschen  <corinna@vinschen.de>
+
+	* fhandler_floppy.cc (fhandler_dev_floppy::lseek): Remove lloffset.
+	Use offset directly.  Add shortcut for lseek(fd, 0, SEEK_CUR) case.
+	(fhandler_dev_floppy::ioctl): Drop wrong RDSETBLK case.
+	* fhandler_raw.cc (fhandler_dev_raw::ioctl): Revamp RDSETBLK code.
+
 2012-10-15  Christopher Faylor  <me.cygwin2012@cgf.cx>
 
 	* fhandler_tty.cc (fhandler_pty_slave::write): Fix potential exit from
diff --git a/winsup/cygwin/fhandler_floppy.cc b/winsup/cygwin/fhandler_floppy.cc
index 01b7c9d..eaa7f6a 100644
--- a/winsup/cygwin/fhandler_floppy.cc
+++ b/winsup/cygwin/fhandler_floppy.cc
@@ -668,24 +668,27 @@ _off64_t
 fhandler_dev_floppy::lseek (_off64_t offset, int whence)
 {
   char buf[bytes_per_sector];
-  _off64_t lloffset = offset;
   _off64_t current_pos = (_off64_t) -1;
   LARGE_INTEGER sector_aligned_offset;
   size_t bytes_left;
 
   if (whence == SEEK_END)
     {
-      lloffset += drive_size;
+      offset += drive_size;
       whence = SEEK_SET;
     }
   else if (whence == SEEK_CUR)
     {
       current_pos = get_current_position ();
-      lloffset += current_pos - (devbufend - devbufstart);
+      _off64_t exact_pos = current_pos - (devbufend - devbufstart);
+      /* Shortcut when used to get current position. */
+      if (offset == 0)
+      	return exact_pos;
+      offset += exact_pos;
       whence = SEEK_SET;
     }
 
-  if (whence != SEEK_SET || lloffset < 0 || lloffset > drive_size)
+  if (whence != SEEK_SET || offset < 0 || offset > drive_size)
     {
       set_errno (EINVAL);
       return -1;
@@ -696,15 +699,15 @@ fhandler_dev_floppy::lseek (_off64_t offset, int whence)
     {
       if (current_pos == (_off64_t) -1)
 	current_pos = get_current_position ();
-      if (current_pos - devbufend <= lloffset && lloffset <= current_pos)
+      if (current_pos - devbufend <= offset && offset <= current_pos)
 	{
-	  devbufstart = devbufend - (current_pos - lloffset);
-	  return lloffset;
+	  devbufstart = devbufend - (current_pos - offset);
+	  return offset;
 	}
     }
 
-  sector_aligned_offset.QuadPart = rounddown (lloffset, bytes_per_sector);
-  bytes_left = lloffset - sector_aligned_offset.QuadPart;
+  sector_aligned_offset.QuadPart = rounddown (offset, bytes_per_sector);
+  bytes_left = offset - sector_aligned_offset.QuadPart;
 
   /* Invalidate buffer. */
   devbufstart = devbufend = 0;
@@ -779,17 +782,6 @@ fhandler_dev_floppy::ioctl (unsigned int cmd, void *buf)
       debug_printf ("BLKALIGNOFF");
       *(int *)buf = 0;
       break;
-    case RDSETBLK:
-      /* Just check the restriction that blocksize must be a multiple
-	 of the sector size of the underlying volume sector size,
-	 then fall through to fhandler_dev_raw::ioctl. */
-      debug_printf ("RDSETBLK");
-      if (((struct rdop *) buf)->rd_parm % bytes_per_sector)
-	{
-	  set_errno (EINVAL);
-	  return -1;
-	}
-      /*FALLTHRU*/
     default:
       ret = fhandler_dev_raw::ioctl (cmd, buf);
       break;
diff --git a/winsup/cygwin/fhandler_raw.cc b/winsup/cygwin/fhandler_raw.cc
index 61981a4..cb88295 100644
--- a/winsup/cygwin/fhandler_raw.cc
+++ b/winsup/cygwin/fhandler_raw.cc
@@ -11,6 +11,7 @@
 
 #include "winsup.h"
 
+#include <unistd.h>
 #include <cygwin/rdevio.h>
 #include <sys/mtio.h>
 #include <sys/param.h>
@@ -151,36 +152,32 @@ fhandler_dev_raw::ioctl (unsigned int cmd, void *buf)
 		mop.mt_count = op->rd_parm;
 		ret = ioctl (MTIOCTOP, &mop);
 	      }
-	    else if ((devbuf && ((op->rd_parm <= 1 && (devbufend - devbufstart))
-				 || op->rd_parm < devbufend - devbufstart))
-		     || (op->rd_parm > 1 && (op->rd_parm % 512))
+	    else if ((op->rd_parm <= 1 && get_major () != DEV_TAPE_MAJOR)
+		     || (op->rd_parm > 1 && (op->rd_parm % devbufalign))
 		     || (get_flags () & O_DIRECT))
-	      /* The conditions for a *valid* parameter are these:
-		 - If there's still data in the current buffer, it must
-		   fit in the new buffer.
-		 - The new size is either 0 or 1, both indicating unbufferd
-		   I/O, or the new buffersize must be a multiple of 512.
+	      /* The conditions for a valid parameter are:
+		 - The new size is either 0 or 1, both indicating unbuffered
+		   I/O, and the device is a tape device.
+		 - Or, the new buffersize must be a multiple of the
+		   required buffer alignment.
 		 - In the O_DIRECT case, the whole request is invalid. */
 	      ret = ERROR_INVALID_PARAMETER;
 	    else if (!devbuf || op->rd_parm != devbufsiz)
 	      {
 		char *buf = NULL;
+		_off64_t curpos = lseek (0, SEEK_CUR);
+
 		if (op->rd_parm > 1L)
-		  buf = new char [op->rd_parm];
-		if (buf && devbufsiz > 1L)
-		  {
-		    memcpy (buf, devbuf + devbufstart, devbufend - devbufstart);
-		    devbufend -= devbufstart;
-		  }
-		else
-		  devbufend = 0;
+		  buf = new char [op->rd_parm + devbufalign];
 
 		if (devbufsiz > 1L)
 		  delete [] devbufalloc;
 
-		devbufstart = 0;
-		devbuf = buf;
+		devbufalloc = buf;
+		devbuf = (char *) roundup2 ((uintptr_t) buf, devbufalign);
 		devbufsiz = op->rd_parm ?: 1L;
+		devbufstart = devbufend = 0;
+		lseek (curpos, SEEK_SET);
 	      }
 	    break;
 	  default: