lib/libc/locale/setlocale.c

/*
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Paul Borman at Krystal Technologies.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)setlocale.c 8.1 (Berkeley) 7/4/93";
#endif /* LIBC_SCCS and not lint */

#include <limits.h>
#include <locale.h>
#include <rune.h>
#include <stdlib.h>
#include <string.h>

/*
 * Category names for getenv()
 */
static char *categories[_LC_LAST] = {
    "LC_ALL",
    "LC_COLLATE",
    "LC_CTYPE",
    "LC_MONETARY",
    "LC_NUMERIC",
    "LC_TIME",
};

/*
 * Current locales for each category
 */
static char current_categories[_LC_LAST][32] = {
    "C",
    "C",
    "C",
    "C",
    "C",
    "C",
};

/*
 * The locales we are going to try and load
 */
static char new_categories[_LC_LAST][32];

static char current_locale_string[_LC_LAST * 33];
static char *PathLocale;

static char     *currentlocale __P((void));
static char     *loadlocale __P((int));

char *
setlocale(category, locale)
        int category;
        const char *locale;
{
        int found, i, len;
        char *env, *r;

        if (!PathLocale && !(PathLocale = getenv("PATH_LOCALE")))
                PathLocale = _PATH_LOCALE;

        if (category < 0 || category >= _LC_LAST)
                return (NULL);

        if (!locale)
                return (category ?
                    current_categories[category] : currentlocale());

        /*
         * Default to the current locale for everything.
         */
        for (i = 1; i < _LC_LAST; ++i)
                (void)strcpy(new_categories[i], current_categories[i]);

        /*
         * Now go fill up new_categories from the locale argument
         */
        if (!*locale) {
                env = getenv(categories[category]);

                if (!env)
                        env = getenv(categories[0]);

                if (!env)
                        env = getenv("LANG");

                if (!env)
                        env = "C";

                (void) strncpy(new_categories[category], env, 31);
                new_categories[category][31] = 0;
                if (!category) {
                        for (i = 1; i < _LC_LAST; ++i) {
                                if (!(env = getenv(categories[i])))
                                        env = new_categories[0];
                                (void)strncpy(new_categories[i], env, 31);
                                new_categories[i][31] = 0;
                        }
                }
        } else if (category)  {
                (void)strncpy(new_categories[category], locale, 31);
                new_categories[category][31] = 0;
        } else {
                if ((r = strchr(locale, '/')) == 0) {
                        for (i = 1; i < _LC_LAST; ++i) {
                                (void)strncpy(new_categories[i], locale, 31);
                                new_categories[i][31] = 0;
                        }
                } else {
                        for (i = 1; r[1] == '/'; ++r);
                        if (!r[1])
                                return (NULL);  /* Hmm, just slashes... */
                        do {
                                len = r - locale > 31 ? 31 : r - locale;
                                (void)strncpy(new_categories[i++], locale, len);
                                new_categories[i++][len] = 0;
                                locale = r;
                                while (*locale == '/')
                                    ++locale;
                                while (*++r && *r != '/');
                        } while (*locale);
                        while (i < _LC_LAST)
                                (void)strcpy(new_categories[i],
                                    new_categories[i-1]);
                }
        }

        if (category)
                return (loadlocale(category));

        found = 0;
        for (i = 1; i < _LC_LAST; ++i)
                if (loadlocale(i) != NULL)
                        found = 1;
        if (found)
            return (currentlocale());
        return (NULL);
}

static char *
currentlocale()
{
        int i;

        (void)strcpy(current_locale_string, current_categories[1]);

        for (i = 2; i < _LC_LAST; ++i)
                if (strcmp(current_categories[1], current_categories[i])) {
                        (void)snprintf(current_locale_string,
                            sizeof(current_locale_string), "%s/%s/%s/%s/%s",
                            current_categories[1], current_categories[2],
                            current_categories[3], current_categories[4],
                            current_categories[5]);
                        break;
                }
        return (current_locale_string);
}

static char *
loadlocale(category)
        int category;
{
        char name[PATH_MAX];

        if (strcmp(new_categories[category],
            current_categories[category]) == 0)
                return (current_categories[category]);

        if (category == LC_CTYPE) {
                if (setrunelocale(new_categories[LC_CTYPE]))
                        return (NULL);
                (void)strcpy(current_categories[LC_CTYPE],
                    new_categories[LC_CTYPE]);
                return (current_categories[LC_CTYPE]);
        }

        if (!strcmp(new_categories[category], "C") ||
                !strcmp(new_categories[category], "POSIX")) {

                /*
                 * Some day this will need to reset the locale to the default
                 * C locale.  Since we have no way to change them as of yet,
                 * there is no need to reset them.
                 */
                (void)strcpy(current_categories[category],
                    new_categories[category]);
                return (current_categories[category]);
        }

        /*
         * Some day we will actually look at this file.
         */
        (void)snprintf(name, sizeof(name), "%s/%s/%s",
            PathLocale, new_categories[category], categories[category]);

        switch (category) {
                case LC_COLLATE:
                case LC_MONETARY:
                case LC_NUMERIC:
                case LC_TIME:
                        return (NULL);
        }
}