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Re: wide characters, get_wch() and form_driver() - cannot get them worki

From: Adam Spragg
Subject: Re: wide characters, get_wch() and form_driver() - cannot get them working together.
Date: Thu, 19 Jun 2008 14:08:38 +0100
User-agent: KMail/1.9.9


On Thursday 19 June 2008 00:37:58 Thomas Dickey wrote:
> Using ncurses's trace, I can see that the form_driver is seeing the
> parameter passed to it as sign-extended.  That's happening in this
> line:
>                      if ((i = form_driver(form, buf[j])) != E_OK) {
> since 'buf' is a (by default on some platforms) signed char.
> A quick check with that changed to unsigned char seems to work.

Ah - that fixes it for me too. Thanks!

I can't see anything about needing to cast the "i" parameter of 
form_driver() to "unsigned char" in any of the guides, the FAQ, the 
form_driver(3) man page, the get_wch(3) man page (might this be needed 
for other functions in order for them to accept wide characters?), or 
the general ncurses(3) man page. Is it documented somewhere that I 

If not, might this be worth adding do the documentation? Perhaps with a 
note that you also need to convert the wide character you get from 
get_wch() to a multibyte sequence with wctomb(3) or wcrtomb(3) first, 
before the bytes can be passed as unsigned chars to form_driver().


Adam Spragg                      mailto:address@hidden
Octal Telecom                           http://www.octaltelecom.co.uk/

It reverses the logical flow of conversation!
> Why?
> > No.
> > > Should I top post?


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