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Re: [bug-ncurses] export _mouse_fd for select(2)

From: sgerwk
Subject: Re: [bug-ncurses] export _mouse_fd for select(2)
Date: Fri, 28 Jun 2019 11:46:26 +0000 (UTC)

Once there was this option to disable html email and just send plain text. It doesn't seem to exist any longer on the web interface...

Anyway, here is the patch as an attachment

-----Original Message-----
From: Dr. Werner Fink <address@hidden>
To: bug-ncurses <address@hidden>
Sent: Fri, Jun 28, 2019 9:06 am
Subject: Re: [bug-ncurses] export _mouse_fd for select(2)

On 2019/06/27 13:03:19 +0000, address@hidden wrote:

> > Currently, one can include STDIN_FILENO in a select(2), and then call getch() if input is available on stdin. This allows for a main loop that also wait on other file descriptors, signals and a timeout. Unfortunataly, the mouse cannot be included  in this select because the _mouse_fd field of the SCREEN structure is private. 
> > A workaroud is to have a thread call getch() in blocking mode and then serve the result on a pipe whose other end goes in the select. But this solution seems awkward to me, especially considering that STDIN_FILENO is instead always available to the application, and compared with having a function like getmousefd() that returns _mouse_fd. 
> > This function would be similar to ConnectionNumber(Display *) in XWindow: it returns a file descriptor to be used in a select, so that the application may then call XNextEvent() or similar if something can be read there. I believe it is not supposed to be used in any other way. 
> Here is a patch for doing this:
> --- ncurses-6.1/include/curses.tail 2016-02-13 17:37:45.000000000 +0100+++ ncurses-6.1-withmousefd/include/curses.tail 2019-06-26 10:57:05.755049847 +0200@@ -95,6 +95,7 @@ MEVENT;  extern NCURSES_EXPORT(bool)    has_mouse(void);+extern NCURSES_EXPORT(int)     getmousefd(void); extern NCURSES_EXPORT(int)     getmouse (MEVENT *); extern NCURSES_EXPORT(int)     ungetmouse (MEVENT *); extern NCURSES_EXPORT(mmask_t) mousemask (mmask_t, mmask_t *);@@ -105,6 +106,7 @@  #if NCURSES_SP_FUNCS extern NCURSES_EXPORT(bool)    NCURSES_SP_NAME(has_mouse) (SCREEN*);+extern NCURSES_EXPORT(int)     NCURSES_SP_NAME(getmousefd) (SCREEN*); extern NCURSES_EXPORT(int)     NCURSES_SP_NAME(getmouse) (SCREEN*, MEVENT *); extern NCURSES_EXPORT(int)     NCURSES_SP_NAME(ungetmouse) (SCREEN*,MEVENT *); extern NCURSES_EXPORT(mmask_t) NCURSES_SP_NAME(mousemask) (SCREEN*, mmask_t, mmask_t *);--- ncurses-6.1/ncurses/base/lib_mouse.c 2017-11-18 23:12:06.000000000 +0100+++ ncurses-6.1-withmousefd/ncurses/base/lib_mouse.c 2019-06-26 10:56:53.138048893 +0200@@ -2005,3 +2005,17 @@     }     returnBool(result); }++NCURSES_EXPORT(int)+_nc_getmousefd(SCREEN *scr) {+ return scr->_mouse_fd;+}++#if NCURSES_SP_FUNCS+NCURSES_EXPORT(int)+getmousefd(void)+{+    return _nc_getmousefd(CURRENT_SCREEN);+}+#endif+

Please attach patches as separate text file instead of including them within HTML
text container of your e-mail ;)

Even if readed the HTML part of your mail with an HTML viewer with correct word
wrap and line break, the spaces and tabulators do also survive in a real text
file of mime type text/x-patch or text/plain

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