Some comments about changes in revno 110444

[Eli Zaretskii <eliz@gnu.org>]

This hunk removes w32inevt from SOME_MACHINE_OBJECTS.  Why was that
needed?

   SOME_MACHINE_OBJECTS = dosfns.o msdos.o \
     xterm.o xfns.o xmenu.o xselect.o xrdb.o xsmfns.o fringe.o image.o \
  -  fontset.o dbusbind.o \
  +  fontset.o dbusbind.o cygw32.o \
     nsterm.o nsfns.o nsmenu.o nsselect.o nsimage.o nsfont.o \
  -  w32.o w32console.o w32fns.o w32heap.o w32inevt.o \
  +  w32.o w32console.o w32fns.o w32heap.o \
     w32menu.o w32proc.o w32reg.o w32select.o w32term.o w32xfns.o \
     w16select.o widget.o xfont.o ftfont.o xftfont.o ftxfont.o gtkutil.o \
     xsettings.o xgselect.o termcap.o

To avoid confusion, I suggest to change the name of the variable here:

  +  /* No, not utf-16-le: that one has a BOM.  */
  +  DEFSYM (Qutf_16_le, "utf-16le");

to Qutf_16le.

Isn't the below supposed to be done automagically by make-docfile,
which puts these in globals.h?

  +EXFUN (Fcygwin_convert_path_to_windows, 2);
  +EXFUN (Fcygwin_convert_path_from_windows, 2);

I don't think this (from w32select.h) is a good idea:

  +#define HAVE_W32SELECT 1

We only have definitions for HAVE_* macros in config.h and
conf_post.h.  Having them in other headers is confusing, IMO.  Can we
move this to conf_post.h instead?

You moved the definitions of these from w32heap.c to w32fns.c:

  +/* The major and minor versions of NT.  */
  +int w32_major_version;
  +int w32_minor_version;
  +int w32_build_number;

but they are still referenced by w32.c via get_* macros defined on
w32heap.h.  Can we clean this up, please?

Regarding this:

  +#ifdef NTGUI_UNICODE
  +  wchar_t filename_buf[MAX_PATH + 1];

I believe Unicode names on Windows are not limited to MAX_PATH
characters.

It looks like there are some unnecessary hops here:

  +    CHECK_STRING (prompt);
  +    CHECK_STRING (dir);
  +
  +    dir = Fexpand_file_name (dir, Qnil);
  +
  +    if (STRINGP (filename))
  +      filename = Ffile_name_nondirectory (filename);
  +    else
  +      filename = empty_unibyte_string;
  +
  +#ifdef CYGWIN
  +    dir = Fcygwin_convert_path_to_windows (dir, Qt);
  +    if (SCHARS (filename) > 0)
  +      filename = Fcygwin_convert_path_to_windows (filename, Qnil);
  +#endif

  +    CHECK_STRING (dir);
  +    CHECK_STRING (filename);
  +
  +    /* The code in file_dialog_callback that attempts to set the text
  +       of the file name edit window when handling the CDN_INITDONE
  +       WM_NOTIFY message does not work.  Setting filename to "Current
  +       Directory" in the only_dir_p case here does work however.  */
  +    if (SCHARS (filename) == 0 && ! NILP (only_dir_p))
  +      filename = build_string ("Current Directory");
  +
  +    /* Convert the values we've computed so far to system form.  */
  +#ifdef NTGUI_UNICODE
  +    to_unicode (prompt, &prompt);
  +    to_unicode (dir, &dir);
  +    to_unicode (filename, &filename);

AFAIU, inside Fcygwin_convert_path_to_windows, you convert the names
of the file and directory to UTF-16, then decode it back into a
multibyte string, and finally encode it again to UTF-16 when you call
to_unicode.  Perhaps the back and forth conversion to and from UTF-16
can be avoided?

In any case, a call to CHECK_STRING after we already checked the
arguments seems both redundant and user-unfriendly: these tests are
designed to reject errors in arguments passed to primitives, so
signaling an error because something went wrong in processing valid
arguments doesn't sound like a good idea.

This error will not report the offending file name:

  +    if (SBYTES (filename) + 1 > sizeof (filename_buf))
  +      error ("filename too long");

I think report_file_error is better here.

Why do you need the fprintf part here:

  #ifdef EMACSDEBUG
  void
  _DebPrint (const char *fmt, ...)
  {
    char buf[1024];
    va_list args;

    va_start (args, fmt);
    vsprintf (buf, fmt, args);
    va_end (args);
  #if CYGWIN
    fprintf (stderr, "%s", buf);
  #endif
    OutputDebugString (buf);
  }

What happened to number 21 in the change below?

   #define WM_EMACS_HIDE_CARET            (WM_EMACS_START + 18)
   #define WM_EMACS_SETCURSOR             (WM_EMACS_START + 19)
   #define WM_EMACS_PAINT                 (WM_EMACS_START + 20)
  -#define WM_EMACS_BRINGTOTOP            (WM_EMACS_START + 21)
  -#define WM_EMACS_END                   (WM_EMACS_START + 22)
  +#define WM_EMACS_BRINGTOTOP            (WM_EMACS_START + 22)
  +#define WM_EMACS_INPUT_READY           (WM_EMACS_START + 23)
  +#define WM_EMACS_END                   (WM_EMACS_START + 24)

Why did you need the call to notify_msg_ready below?

  @@ -285,7 +309,7 @@ prepend_msg (W32Msg *lpmsg)
     nQueue++;
     lpNew->lpNext = lpHead;
     lpHead = lpNew;
  -
  +  notify_msg_ready ();