Re: lua for unicode

[Roberto Ierusalimschy <roberto@...>]

> What issues would be involved getting lua to natively use the MS Windows 
> 16-bit unicode effort?

Mainly you have to change all calls (from str* to wstr*, but also from
fopen to _wfopen etc etc), redefine `char' to wchar_t, add "L" to all
literal strings in the code, add "L" to all literal characters in the
code, and then redefine some other stuff (such as EOF). We tried to
automate that in Lua, using lots of macros (I think some of 4.1 work
versions have it). It did work (I sussessfully compiled and ran Lua in
Windows using that stuff), but it was lots of pain to keep (mainly the
macros to put the "L"s), so we removed those macros.

Currently we try to facilitate the task, without explicit support. Among
other things, we avoid using "..." or '.' inside comments, we try to use
"char" only for characters (otherwise we use lu_byte), and we try to
keep the code independent of the fact that sizeof(char)==1. (I think
Luiz has some code to add "L" to your literals.)

Attached follows a list of what is (or was, for Lua 4.1w) involved in
the translation.

-- Roberto

#ifndef wwwc_h
#define wwc_h


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#include <locale.h>

#define L_CHAR	wchar_t
#define l_charint	wint_t

#define uchar(c)	(c)


#define l_c(x)	L##x
#define l_saux(x)	L##x
#define l_s(x)		l_saux(x)

#undef EOF
#define EOF		WEOF

#define	strcspn		wcscspn
#define fgetc		fgetwc
#define fgets		fgetws
#define fprintf		fwprintf
#define fputs		fputws
#define fscanf		fwscanf
#define printf		wprintf
#define sprintf		swprintf
#define strchr		wcschr
#define strcmp		wcscmp
#define strcoll		wcscoll
#define strcpy		wcscpy
#define strftime	wcsftime
#define strlen		wcslen
#define strncpy		wcsncpy
#define strpbrk		wcspbrk
#define strtod		wcstod
#define strtol		wcstol
#define strtoul		wcstoul
#define vsprintf	vswprintf


#define fopen		_wfopen
#define strerror(x)	L"system error"
#define system		_wsystem
#define remove		_wremove
#define rename		_wrename
#define tmpnam		_wtmpnam
#define getenv		_wgetenv
#define setlocale	_wsetlocale
#define perror		_wperror

#undef isalnum
#define	isalnum		iswalnum
#undef isalpha
#define	isalpha		iswalpha
#undef iscntrl
#define	iscntrl		iswcntrl
#undef isdigit
#define	isdigit		iswdigit
#undef islower
#define	islower		iswlower
#undef ispunct
#define	ispunct		iswpunct
#undef isspace
#define	isspace		iswspace
#undef isupper
#define	isupper		iswupper
#undef isxdigit
#define	isxdigit	iswxdigit

#define main	wmain

#endif