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/*

 * Copyright (c) 2000, 2001 Alexey Zelkin <phantom@FreeBSD.org>

 * All rights reserved.

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 */

#include <sys/cdefs.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/syslimits.h>

#include <fcntl.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "setlocale.h"

#include "ldpart.h"

static int split_lines(char *, const char *);

static void set_from_buf(const char *, int, const char **);

int

__part_load_locale(const char *name,

                int *using_locale,

                char *locale_buf,

                const char *category_filename,

                int locale_buf_size_max,

                int locale_buf_size_min,

                const char **dst_localebuf) {

        static char             locale_buf_C[] = "C";

        static int              num_lines;

        int                      fd;

        char                    *lbuf;

        char                    *p;

        const char              *plim;

        char                     filename[PATH_MAX];

#ifdef __USE_INTERNAL_STAT64

        struct stat64            st;

#else

        struct stat              st;

#endif

        size_t                   namesize;

        size_t                   bufsize;

        int                      save_using_locale;

        char *nptr;

        save_using_locale = *using_locale;

        *using_locale = 0;

        if (name == NULL)

                goto no_locale;

        if (!strcmp(name, "C") || !strcmp(name, "POSIX"))

                return 0;

        /*

         * If the locale name is the same as our cache, use the cache.

         */

        lbuf = locale_buf;

        if (lbuf != NULL && strcmp(name, lbuf) == 0) {

                set_from_buf(lbuf, num_lines, dst_localebuf);

                *using_locale = 1;

                return 0;

        }

        /*

         * Slurp the locale file into the cache.

         */

        namesize = strlen(name) + 1;

        if (!_PathLocale)

                goto no_locale;

        /* Range checking not needed, 'name' size is limited */

        strcpy(filename, _PathLocale);

        strcat(filename, "/");

        strcat(filename, name);

        strcat(filename, "/");

        strcat(filename, category_filename);

        fd = open(filename, O_RDONLY);

        if (fd < 0)

                goto no_locale;

#ifdef __USE_INTERNAL_STAT64

        if (fstat64(fd, &st) != 0)

#else

        if (fstat(fd, &st) != 0)

#endif

                goto bad_locale;

        if (st.st_size <= 0)

                goto bad_locale;

        bufsize = namesize + st.st_size;

        locale_buf = NULL;

        if (lbuf == NULL || lbuf == locale_buf_C)

          {

            lbuf = malloc(bufsize);

          }

        else

          {

            nptr = realloc(lbuf, bufsize);

            if (!nptr && lbuf)

              free (lbuf);

            lbuf = nptr;

          }

        if (lbuf == NULL)

                goto bad_locale;

        (void) strcpy(lbuf, name);

        p = lbuf + namesize;

        plim = p + st.st_size;

        if (read(fd, p, (size_t) st.st_size) != st.st_size)

                goto bad_lbuf;

        if (close(fd) != 0)

                goto bad_lbuf;

        /*

         * Parse the locale file into localebuf.

         */

        if (plim[-1] != '\n')

                goto bad_lbuf;

        num_lines = split_lines(p, plim);

        if (num_lines >= locale_buf_size_max)

                num_lines = locale_buf_size_max;

        else if (num_lines >= locale_buf_size_min)

                num_lines = locale_buf_size_min;

        else

                goto reset_locale;

        set_from_buf(lbuf, num_lines, dst_localebuf);

        /*

         * Record the successful parse in the cache.

         */

        locale_buf = lbuf;

        *using_locale = 1;

        return 0;

reset_locale:

        locale_buf = locale_buf_C;

        save_using_locale = 0;

bad_lbuf:

        free(lbuf);

bad_locale:

        (void)close(fd);

no_locale:

        *using_locale = save_using_locale;

        return -1;

}

static int

split_lines(char *p, const char *plim) {

        int i;

        for (i = 0; p < plim; i++) {

                p = strchr(p, '\n');

                *p++ = '\0';

        }

        return i;

}

static void

set_from_buf(const char *p, int num_lines, const char **dst_localebuf) {

        const char **ap;

        int i;

        for (ap = dst_localebuf, i = 0; i < num_lines; ++ap, ++i)

                *ap = p += strlen(p) + 1;

}