281 lines
6.5 KiB
C
281 lines
6.5 KiB
C
/* nls.c -- skeletal internationalization code. */
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/* Copyright (C) 1996-2009 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library (Readline), a library
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for reading lines of text with interactive input and history editing.
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Readline is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Readline is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Readline. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include <stdio.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#if defined (HAVE_LOCALE_H)
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# include <locale.h>
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#endif
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#if defined (HAVE_LANGINFO_CODESET)
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# include <langinfo.h>
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#endif
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#include <ctype.h>
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#include "rldefs.h"
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#include "readline.h"
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#include "rlshell.h"
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#include "rlprivate.h"
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static int utf8locale PARAMS((char *));
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#if !defined (HAVE_SETLOCALE)
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/* A list of legal values for the LANG or LC_CTYPE environment variables.
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If a locale name in this list is the value for the LC_ALL, LC_CTYPE,
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or LANG environment variable (using the first of those with a value),
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readline eight-bit mode is enabled. */
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static char *legal_lang_values[] =
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{
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"iso88591",
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"iso88592",
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"iso88593",
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"iso88594",
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"iso88595",
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"iso88596",
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"iso88597",
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"iso88598",
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"iso88599",
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"iso885910",
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"koi8r",
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0
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};
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static char *normalize_codeset PARAMS((char *));
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#endif /* !HAVE_SETLOCALE */
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static char *find_codeset PARAMS((char *, size_t *));
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static char *_rl_get_locale_var PARAMS((const char *));
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static char *
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_rl_get_locale_var (v)
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const char *v;
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{
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char *lspec;
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lspec = sh_get_env_value ("LC_ALL");
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if (lspec == 0 || *lspec == 0)
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lspec = sh_get_env_value (v);
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if (lspec == 0 || *lspec == 0)
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lspec = sh_get_env_value ("LANG");
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return lspec;
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}
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static int
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utf8locale (lspec)
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char *lspec;
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{
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char *cp;
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size_t len;
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#if HAVE_LANGINFO_CODESET
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cp = nl_langinfo (CODESET);
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return (STREQ (cp, "UTF-8") || STREQ (cp, "utf8"));
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#else
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cp = find_codeset (lspec, &len);
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if (cp == 0 || len < 4 || len > 5)
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return 0;
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return ((len == 5) ? strncmp (cp, "UTF-8", len) == 0 : strncmp (cp, "utf8", 4) == 0);
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#endif
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}
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/* Check for LC_ALL, LC_CTYPE, and LANG and use the first with a value
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to decide the defaults for 8-bit character input and output. Returns
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1 if we set eight-bit mode. */
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int
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_rl_init_eightbit ()
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{
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/* If we have setlocale(3), just check the current LC_CTYPE category
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value, and go into eight-bit mode if it's not C or POSIX. */
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#if defined (HAVE_SETLOCALE)
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char *lspec, *t;
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/* Set the LC_CTYPE locale category from environment variables. */
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lspec = _rl_get_locale_var ("LC_CTYPE");
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/* Since _rl_get_locale_var queries the right environment variables,
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we query the current locale settings with setlocale(), and, if
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that doesn't return anything, we set lspec to the empty string to
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force the subsequent call to setlocale() to define the `native'
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environment. */
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if (lspec == 0 || *lspec == 0)
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lspec = setlocale (LC_CTYPE, (char *)NULL);
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if (lspec == 0)
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lspec = "";
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t = setlocale (LC_CTYPE, lspec);
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if (t && *t)
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_rl_utf8locale = utf8locale (t);
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if (t && *t && (t[0] != 'C' || t[1]) && (STREQ (t, "POSIX") == 0))
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{
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_rl_meta_flag = 1;
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_rl_convert_meta_chars_to_ascii = 0;
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_rl_output_meta_chars = 1;
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return (1);
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}
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else
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return (0);
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#else /* !HAVE_SETLOCALE */
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char *lspec, *t;
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int i;
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/* We don't have setlocale. Finesse it. Check the environment for the
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appropriate variables and set eight-bit mode if they have the right
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values. */
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lspec = _rl_get_locale_var ("LC_CTYPE");
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if (lspec == 0 || (t = normalize_codeset (lspec)) == 0)
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return (0);
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for (i = 0; t && legal_lang_values[i]; i++)
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if (STREQ (t, legal_lang_values[i]))
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{
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_rl_meta_flag = 1;
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_rl_convert_meta_chars_to_ascii = 0;
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_rl_output_meta_chars = 1;
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break;
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}
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xfree (t);
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return (legal_lang_values[i] ? 1 : 0);
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#endif /* !HAVE_SETLOCALE */
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}
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#if !defined (HAVE_SETLOCALE)
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static char *
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normalize_codeset (codeset)
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char *codeset;
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{
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size_t namelen, i;
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int len, all_digits;
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char *wp, *retval;
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codeset = find_codeset (codeset, &namelen);
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if (codeset == 0)
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return (codeset);
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all_digits = 1;
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for (len = 0, i = 0; i < namelen; i++)
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{
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if (ISALNUM ((unsigned char)codeset[i]))
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{
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len++;
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all_digits &= _rl_digit_p (codeset[i]);
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}
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}
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retval = (char *)malloc ((all_digits ? 3 : 0) + len + 1);
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if (retval == 0)
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return ((char *)0);
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wp = retval;
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/* Add `iso' to beginning of an all-digit codeset */
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if (all_digits)
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{
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*wp++ = 'i';
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*wp++ = 's';
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*wp++ = 'o';
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}
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for (i = 0; i < namelen; i++)
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if (ISALPHA ((unsigned char)codeset[i]))
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*wp++ = _rl_to_lower (codeset[i]);
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else if (_rl_digit_p (codeset[i]))
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*wp++ = codeset[i];
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*wp = '\0';
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return retval;
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}
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#endif /* !HAVE_SETLOCALE */
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/* Isolate codeset portion of locale specification. */
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static char *
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find_codeset (name, lenp)
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char *name;
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size_t *lenp;
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{
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char *cp, *language, *result;
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cp = language = name;
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result = (char *)0;
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while (*cp && *cp != '_' && *cp != '@' && *cp != '+' && *cp != ',')
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cp++;
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/* This does not make sense: language has to be specified. As
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an exception we allow the variable to contain only the codeset
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name. Perhaps there are funny codeset names. */
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if (language == cp)
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{
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*lenp = strlen (language);
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result = language;
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}
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else
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{
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/* Next is the territory. */
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if (*cp == '_')
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do
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++cp;
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while (*cp && *cp != '.' && *cp != '@' && *cp != '+' && *cp != ',' && *cp != '_');
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/* Now, finally, is the codeset. */
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result = cp;
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if (*cp == '.')
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do
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++cp;
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while (*cp && *cp != '@');
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if (cp - result > 2)
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{
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result++;
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*lenp = cp - result;
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}
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else
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{
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*lenp = strlen (language);
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result = language;
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}
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}
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return result;
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}
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