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/* nls.c -- skeletal internationalization code. */
/* Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU Readline Library, a library for
reading lines of text with interactive input and history editing.
The GNU Readline Library is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 1, or
(at your option) any later version.
The GNU Readline Library is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty
of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
675 Mass Ave, Cambridge, MA 02139, USA. */
#define READLINE_LIBRARY
#if defined (HAVE_CONFIG_H)
# include <config.h>
#endif
#include <sys/types.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if defined (HAVE_STDLIB_H)
# include <stdlib.h>
#else
# include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */
#if defined (HAVE_LOCALE_H)
# include <locale.h>
#endif
#include <ctype.h>
#include "rldefs.h"
extern int _rl_convert_meta_chars_to_ascii;
extern int _rl_output_meta_chars;
extern int _rl_meta_flag;
/* Functions imported from shell.c */
extern char *get_env_value ();
#if !defined (HAVE_SETLOCALE)
/* A list of legal values for the LANG or LC_CTYPE environment variables.
If a locale name in this list is the value for the LC_ALL, LC_CTYPE,
or LANG environment variable (using the first of those with a value),
readline eight-bit mode is enabled. */
static char *legal_lang_values[] =
{
"iso88591",
"iso88592",
"iso88593",
"iso88594",
"iso88595",
"iso88596",
"iso88597",
"iso88598",
"iso88599",
"iso885910",
"koi8r",
"koi8-r",
0
};
static char *normalize_codeset ();
static char *find_codeset ();
#endif /* !HAVE_SETLOCALE */
/* Check for LC_ALL, LC_CTYPE, and LANG and use the first with a value
to decide the defaults for 8-bit character input and output. Returns
1 if we set eight-bit mode. */
int
_rl_init_eightbit ()
{
/* If we have setlocale(3), just check the current LC_CTYPE category
value, and go into eight-bit mode if it's not C or POSIX. */
#if defined (HAVE_SETLOCALE)
char *t;
/* Set the LC_CTYPE locale category from environment variables. */
t = setlocale (LC_CTYPE, "");
if (t && *t && (t[0] != 'C' || t[1]) && (STREQ (t, "POSIX") == 0))
{
_rl_meta_flag = 1;
_rl_convert_meta_chars_to_ascii = 0;
_rl_output_meta_chars = 1;
return (1);
}
else
return (0);
#else /* !HAVE_SETLOCALE */
char *lspec, *t;
int i;
/* We don't have setlocale. Finesse it. Check the environment for the
appropriate variables and set eight-bit mode if they have the right
values. */
lspec = get_env_value ("LC_ALL");
if (lspec == 0) lspec = get_env_value ("LC_CTYPE");
if (lspec == 0) lspec = get_env_value ("LANG");
if (lspec == 0 || (t = normalize_codeset (lspec)) == 0)
return (0);
for (i = 0; t && legal_lang_values[i]; i++)
if (STREQ (t, legal_lang_values[i]))
{
_rl_meta_flag = 1;
_rl_convert_meta_chars_to_ascii = 0;
_rl_output_meta_chars = 1;
break;
}
free (t);
return (legal_lang_values[i] ? 1 : 0);
#endif /* !HAVE_SETLOCALE */
}
#if !defined (HAVE_SETLOCALE)
static char *
normalize_codeset (codeset)
char *codeset;
{
size_t namelen, i;
int len, all_digits;
char *wp, *retval;
codeset = find_codeset (codeset, &namelen);
if (codeset == 0)
return (codeset);
all_digits = 1;
for (len = 0, i = 0; i < namelen; i++)
{
if (isalnum (codeset[i]))
{
len++;
all_digits &= isdigit (codeset[i]);
}
}
retval = (char *)malloc ((all_digits ? 3 : 0) + len + 1);
if (retval == 0)
return ((char *)0);
wp = retval;
/* Add `iso' to beginning of an all-digit codeset */
if (all_digits)
{
*wp++ = 'i';
*wp++ = 's';
*wp++ = 'o';
}
for (i = 0; i < namelen; i++)
if (isalpha (codeset[i]))
*wp++ = (isupper (codeset[i])) ? tolower (codeset[i]) : codeset[i];
else if (isdigit (codeset[i]))
*wp++ = codeset[i];
*wp = '\0';
return retval;
}
/* Isolate codeset portion of locale specification. */
static char *
find_codeset (name, lenp)
char *name;
size_t *lenp;
{
char *cp, *language, *result;
cp = language = name;
result = (char *)0;
while (*cp && *cp != '_' && *cp != '@' && *cp != '+' && *cp != ',')
cp++;
/* This does not make sense: language has to be specified. As
an exception we allow the variable to contain only the codeset
name. Perhaps there are funny codeset names. */
if (language == cp)
{
*lenp = strlen (language);
result = language;
}
else
{
/* Next is the territory. */
if (*cp == '_')
do
++cp;
while (*cp && *cp != '.' && *cp != '@' && *cp != '+' && *cp != ',' && *cp != '_');
/* Now, finally, is the codeset. */
result = cp;
if (*cp == '.')
do
++cp;
while (*cp && *cp != '@');
if (cp - result > 2)
{
result++;
*lenp = cp - result;
}
else
{
*lenp = strlen (language);
result = language;
}
}
return result;
}
#endif /* !HAVE_SETLOCALE */
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