svn commit: r189765 - in head: . lib/libc lib/libc/nls

[Gábor Kövesdán]

> Nice!  I need to find some time to learn how to use NLS.
>
> Now, you only need to revive the BSD-licensed libiconv[1].  :)  I am 
> kidding;  I do not want to start adding more stuff to your plate.  
> Thank you for strengthening FreeBSD's i18n support.
>
> Out of curiosity, how does enabling NLS in libc interact with the 
> devel/gettext port?
Well, it's not a bad idea, actually I'm thinking of generating some more 
catalogs automatically but the problem is that we don't have iconv in 
the base system. For example, we could easily make a hu_HU.UTF-8 catalog 
from hu_HU.ISO8859-2 by just converting the encoding of the catalog 
file. And the same applies to a bunch of locales...

I don't really know gettext so I don't know how they can interact. 
Afaik, gettext is based on some text replacement, while in POSIX.1 NLS, 
you arrange strings into sets and you identify them with a number inside 
the sets. Some people think gettext is easier to use but I suspect that 
it uses a more complex process of building the application itself to 
process its catalogs. POSIX.1 NLS only needs some additional lines. Here 
are some code snippets from BSD grep, which uses a single set with 10 
messages:

grep.h:
================
#ifdef WITHOUT_NLS
#define getstr(n)        errstr[n]
#else
#include <nl_types.h>

extern nl_catd           catalog;
#define getstr(n)        catgets(catalog, 1, n, errstr[n])
#endif

extern char             *errstr[];

grep.c:
================

#ifndef WITHOUT_NLS
#include <nl_types.h>
nl_catd  catalog;
#endif

/*
 * Default messags to use when NLS is disabled or no catalogue
 * is found.
 */
char    *errstr[] = {
        "",
/* 1*/  "(standard input)",
/* 2*/  "cannot read bzip2 compressed file",
/* 3*/  "unknown --color option",
/* 4*/  "usage: %s [-abcDEFGHhIiJLlmnOoPqRSsUVvwxZ] [-A num] [-B num] 
[-C[num]]\n",
/* 5*/  "\t[-e pattern] [-f file] [--binary-files=value] [--color=when]\n",
/* 6*/  "\t[--context[=num]] [--directories=action] [--label] 
[--line-buffered]\n",
/* 7*/  "\t[--null] [pattern] [file ...]\n",
/* 8*/  "unknown --binary-files option",
/* 9*/  "Binary file %s matches\n"
/*10*/  "%s (BSD grep) %s\n",
};


And then you can simply use getstr(n), where n is the number of the 
string you want to use. It will work with catalogs and with NLS 
disables, as well.

-- 
Gabor Kovesdan
FreeBSD Volunteer

EMAIL: gabor at FreeBSD.org .:|:. gabor at kovesdan.org
WEB:   http://people.FreeBSD.org/~gabor .:|:. http://kovesdan.org