Hi AlanI was looking for a previous email you sent about testing Tcl and found
this, which I realised that I can now shed some extra light on, although I have
changed the subject as the topic has changed somewhat - I have just been
looking at some Unicode things while building (and finding bugs in) other
libraries related to Unicode builds. When searching about this things I found
someone posting saying that it is impossible to reliably create string literals
in VC++ with UTF8 encoding. Setting the source code file to UTF-8 does not
guarantee this and apparently the compiler will change string literals to
UTF-16. See
http://stackoverflow.com/questions/688760/how-to-create-a-utf-8-string-literal-in-visual-c-2008
for details. I have in the past passed Unicode string literals to plplot and
it has worked. However I don't know if that is still the case as the post say
this behaviour has changed with VC++ versions. I will check. If it doesn't then
I don't know if there is anything that we can (or should) do about it. Phil
From: Alan W. Irwin <ir...@beluga.phys.uvic.ca>
To: Arjen Markus <arjen.mar...@deltares.nl>
Cc: Phil Rosenberg <philip_rosenb...@yahoo.com>; PLplot development list
<Plplot-devel@lists.sourceforge.net>
Sent: Tuesday, 23 September 2014, 16:39
Subject: Re: [Plplot-devel] tcl build problem
On 2014-09-23 10:36-0000 Arjen Markus wrote:
> Hi Phil,
> I will definitely try these changes with Cygwin and MinGW. Pairs of
functions for handling ASCII and UNICODE strings are ubiquitous under
Windows and I do not expect trouble like Cygwin or MinGW not
supporting the two flavours. Still, that needs to be checked.
To Arjen and Phil:
To interject one additional consideration here, user input to PLplot
on both Unix and Windows should be in the UTF-8 encoding of unicode,
but the actual strings containing those UTF-8 bytes are assumed by our
code to be contained in ordinary char * strings and NOT wide
characters. That's the whole point of UTF-8, it doesn't require wide
characters to contain it. Instead, the number of UTF-8 characters
encoded as bytes in a normal string is sometimes less (if two or more
bytes are used in a character encoding) than the number of bytes in
the string, but that is not an issue for us since all our string
processing of user input simply requires a NULL byte at the end to
mark the end of the UTF-8 string.
Note, we actually do no internal text rendering using the raw user
UTF-8 input. Instead, in all cases we immediately translate that char
* user input from UTF-8 to PLUNICODE (32-byte integer) arrays, and use
those PLUNICODE arrays internally for the text rendering.
So I am virtually positive when there is a Windows macro choice
between normal (so-called ascii) and wide characters anywhere in our
code, than in most (or all?) cases, that choice should be replaced by
the definite narrow version similar to the change Phil just did for
the src/ltdl_win32.c case.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________
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