/*
 * Copyright 1998-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

#ifdef __linux__
#include <stdio.h>
#include <ctype.h>
#endif
#include <pwd.h>
#include <locale.h>
#ifndef ARCHPROPNAME
#error "The macro ARCHPROPNAME has not been defined"
#endif
#include <sys/utsname.h>        /* For os_name and os_version */
#include <langinfo.h>           /* For nl_langinfo */
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/param.h>
#include <time.h>
#include <errno.h>

#include "locale_str.h"
#include "java_props.h"

#ifdef __linux__
#define CODESET _NL_CTYPE_CODESET_NAME
#else
#ifdef ALT_CODESET_KEY
#define CODESET ALT_CODESET_KEY
#endif
#endif

/* Take an array of string pairs (map of key->value) and a string (key).
 * Examine each pair in the map to see if the first string (key) matches the
 * string.  If so, store the second string of the pair (value) in the value and
 * return 1.  Otherwise do nothing and return 0.  The end of the map is
 * indicated by an empty string at the start of a pair (key of "").
 */
static int
mapLookup(char* map[], const char* key, char** value) {
    int i;
    for (i = 0; strcmp(map[i], ""); i += 2){
        if (!strcmp(key, map[i])){
            *value = map[i + 1];
            return 1;
        }
    }
    return 0;
}

/* This function sets an environment variable using envstring.
 * The format of envstring is "name=value".
 * If the name has already existed, it will append value to the name.
 */
static void
setPathEnvironment(char *envstring)
{
    char name[20], *value, *current;

    value = strchr(envstring, '='); /* locate name and value separator */

    if (! value)
        return; /* not a valid environment setting */

    /* copy first part as environment name */
    strncpy(name, envstring, value - envstring);
    name[value-envstring] = '\0';

    value++; /* set value point to value of the envstring */

    current = getenv(name);
    if (current) {
        if (! strstr(current, value)) {
            /* value is not found in current environment, append it */
            char *temp = malloc(strlen(envstring) + strlen(current) + 2);
        strcpy(temp, name);
        strcat(temp, "=");
        strcat(temp, current);
        strcat(temp, ":");
        strcat(temp, value);
        putenv(temp);
        }
        /* else the value has already been set, do nothing */
    }
    else {
        /* environment variable is not found */
        putenv(envstring);
    }
}

#ifndef P_tmpdir
#define P_tmpdir "/var/tmp"
#endif

/* This function gets called very early, before VM_CALLS are setup.
 * Do not use any of the VM_CALLS entries!!!
 */
java_props_t *
GetJavaProperties(JNIEnv *env)
{
    static java_props_t sprops = {0};
    char *v; /* tmp var */

    if (sprops.user_dir) {
        return &sprops;
    }

    /* tmp dir */
    sprops.tmp_dir = P_tmpdir;

    /* Printing properties */
    sprops.printerJob = "sun.print.PSPrinterJob";

    /* patches/service packs installed */
    sprops.patch_level = "unknown";

    /* Java 2D properties */
    sprops.graphics_env = "sun.awt.X11GraphicsEnvironment";
    sprops.awt_toolkit = NULL;

    /* This is used only for debugging of font problems. */
    v = getenv("JAVA2D_FONTPATH");
    sprops.font_dir = v ? v : NULL;

#ifdef SI_ISALIST
    /* supported instruction sets */
    {
        char list[258];
        sysinfo(SI_ISALIST, list, sizeof(list));
        sprops.cpu_isalist = strdup(list);
    }
#else
    sprops.cpu_isalist = NULL;
#endif

    /* endianness of platform */
    {
        unsigned int endianTest = 0xff000000;
        if (((char*)(&endianTest))[0] != 0)
            sprops.cpu_endian = "big";
        else
            sprops.cpu_endian = "little";
    }

    /* os properties */
    {
        struct utsname name;
        uname(&name);
        sprops.os_name = strdup(name.sysname);
        sprops.os_version = strdup(name.release);

        sprops.os_arch = ARCHPROPNAME;

        if (getenv("GNOME_DESKTOP_SESSION_ID") != NULL) {
            sprops.desktop = "gnome";
        }
        else {
            sprops.desktop = NULL;
        }
    }

    /* Determine the language, country, variant, and encoding from the host,
     * and store these in the user.language, user.country, user.variant and
     * file.encoding system properties. */
    {
        char *lc;
        lc = setlocale(LC_CTYPE, "");
#ifndef __linux__
        if (lc == NULL) {
            /*
             * 'lc == null' means system doesn't support user's environment
             * variable's locale.
             */
          setlocale(LC_ALL, "C");
          sprops.language = "en";
          sprops.encoding = "ISO8859-1";
          sprops.sun_jnu_encoding = sprops.encoding;
        } else {
#else
        if (lc == NULL || !strcmp(lc, "C") || !strcmp(lc, "POSIX")) {
            lc = "en_US";
        }
        {
#endif

            /*
             * locale string format in Solaris is
             * <language name>_<country name>.<encoding name>@<variant name>
             * <country name>, <encoding name>, and <variant name> are optional.
             */
            char temp[64];
            char *language = NULL, *country = NULL, *variant = NULL,
                 *encoding = NULL;
            char *std_language = NULL, *std_country = NULL, *std_variant = NULL,
                 *std_encoding = NULL;
            char *p, encoding_variant[64];
            int i, found;

#ifndef __linux__
            /*
             * Workaround for Solaris bug 4201684: Xlib doesn't like @euro
             * locales. Since we don't depend on the libc @euro behavior,
             * we just remove the qualifier.
             * On Linux, the bug doesn't occur; on the other hand, @euro
             * is needed there because it's a shortcut that also determines
             * the encoding - without it, we wouldn't get ISO-8859-15.
             * Therefore, this code section is Solaris-specific.
             */
            lc = strdup(lc);    /* keep a copy, setlocale trashes original. */
            strcpy(temp, lc);
            p = strstr(temp, "@euro");
            if (p != NULL)
                *p = '\0';
            setlocale(LC_ALL, temp);
#endif

            strcpy(temp, lc);

            /* Parse the language, country, encoding, and variant from the
             * locale.  Any of the elements may be missing, but they must occur
             * in the order language_country.encoding@variant, and must be
             * preceded by their delimiter (except for language).
             *
             * If the locale name (without .encoding@variant, if any) matches
             * any of the names in the locale_aliases list, map it to the
             * corresponding full locale name.  Most of the entries in the
             * locale_aliases list are locales that include a language name but
             * no country name, and this facility is used to map each language
             * to a default country if that's possible.  It's also used to map
             * the Solaris locale aliases to their proper Java locale IDs.
             */
            if ((p = strchr(temp, '.')) != NULL) {
                strcpy(encoding_variant, p); /* Copy the leading '.' */
                *p = '\0';
            } else if ((p = strchr(temp, '@')) != NULL) {
                 strcpy(encoding_variant, p); /* Copy the leading '@' */
                 *p = '\0';
            } else {
                *encoding_variant = '\0';
            }

            if (mapLookup(locale_aliases, temp, &p)) {
                strcpy(temp, p);
            }

            language = temp;
            if ((country = strchr(temp, '_')) != NULL) {
                *country++ = '\0';
            }

            p = encoding_variant;
            if ((encoding = strchr(p, '.')) != NULL) {
                p[encoding++ - p] = '\0';
                p = encoding;
            }
            if ((variant = strchr(p, '@')) != NULL) {
                p[variant++ - p] = '\0';
            }

            /* Normalize the language name */
            std_language = "en";
            if (language != NULL) {
                mapLookup(language_names, language, &std_language);
            }
            sprops.language = std_language;

            /* Normalize the country name */
            if (country != NULL) {
                std_country = country;
                mapLookup(country_names, country, &std_country);
                sprops.country = strdup(std_country);
            }

            /* Normalize the variant name.  Note that we only use
             * variants listed in the mapping array; others are ignored. */
            if (variant != NULL) {
                mapLookup(variant_names, variant, &std_variant);
                sprops.variant = std_variant;
            }

            /* Normalize the encoding name.  Note that we IGNORE the string
             * 'encoding' extracted from the locale name above.  Instead, we use the
             * more reliable method of calling nl_langinfo(CODESET).  This function
             * returns an empty string if no encoding is set for the given locale
             * (e.g., the C or POSIX locales); we use the default ISO 8859-1
             * converter for such locales.
             */

            /* OK, not so reliable - nl_langinfo() gives wrong answers on
             * Euro locales, in particular. */
            if (strcmp(p, "ISO8859-15") == 0)
                p = "ISO8859-15";
            else
                p = nl_langinfo(CODESET);

            /* Convert the bare "646" used on Solaris to a proper IANA name */
            if (strcmp(p, "646") == 0)
                p = "ISO646-US";

            /* return same result nl_langinfo would return for en_UK,
             * in order to use optimizations. */
            std_encoding = (*p != '\0') ? p : "ISO8859-1";


#ifdef __linux__
            /*
             * Remap the encoding string to a different value for japanese
             * locales on linux so that customized converters are used instead
             * of the default converter for "EUC-JP". The customized converters
             * omit support for the JIS0212 encoding which is not supported by
             * the variant of "EUC-JP" encoding used on linux
             */
            if (strcmp(p, "EUC-JP") == 0) {
                std_encoding = "EUC-JP-LINUX";
            }
#else
            /* For Solaris use customized vendor defined character
             * customized EUC-JP converter
             */
            if (strcmp(p,"eucJP") == 0) {
                std_encoding = "eucJP-open";
            }
#endif
#ifndef __linux__
            /*
             * Remap the encoding string to Big5_Solaris which augments
             * the default converter for Solaris Big5 locales to include
             * seven additional ideographic characters beyond those included
             * in the Java "Big5" converter.
             */
            if (strcmp(p, "Big5") == 0) {
                    std_encoding = "Big5_Solaris";
            }
#endif
            sprops.encoding = std_encoding;
            sprops.sun_jnu_encoding = sprops.encoding;
        }
    }

#ifdef __linux__
#if __BYTE_ORDER == __LITTLE_ENDIAN
    sprops.unicode_encoding = "UnicodeLittle";
#else
    sprops.unicode_encoding = "UnicodeBig";
#endif
#else
    sprops.unicode_encoding = "UnicodeBig";
#endif

    /* user properties */
    {
        struct passwd *pwent = getpwuid(getuid());
        sprops.user_name = pwent ? strdup(pwent->pw_name) : "?";
        sprops.user_home = pwent ? strdup(pwent->pw_dir) : "?";
    }

    /* User TIMEZONE */
    {
        /*
         * We defer setting up timezone until it's actually necessary.
         * Refer to TimeZone.getDefault(). However, the system
         * property is necessary to be able to be set by the command
         * line interface -D. Here temporarily set a null string to
         * timezone.
         */
        tzset();        /* for compatibility */
        sprops.timezone = "";
    }

    /* Current directory */
    {
        char buf[MAXPATHLEN];
        errno = 0;
        if (getcwd(buf, sizeof(buf))  == NULL)
            JNU_ThrowByName(env, "java/lang/Error",
             "Properties init: Could not determine current working directory.");
        else
            sprops.user_dir = strdup(buf);
    }

    sprops.file_separator = "/";
    sprops.path_separator = ":";
    sprops.line_separator = "\n";

    /* Append CDE message and resource search path to NLSPATH and
     * XFILESEARCHPATH, in order to pick localized message for
     * FileSelectionDialog window (Bug 4173641).
     */
    setPathEnvironment("NLSPATH=/usr/dt/lib/nls/msg/%L/%N.cat");
    setPathEnvironment("XFILESEARCHPATH=/usr/dt/app-defaults/%L/Dt");

    return &sprops;
}