/*
 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
 * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
 * 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 "lint.h"
#include "file64.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>

#include "libc.h"
#include "ldpart.h"
#include "setlocale.h"

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

int
__part_load_locale(const char *name,
    char **locale_buf, const char *category_filename,
    int locale_buf_size_max, int locale_buf_size_min,
    const char **dst_localebuf)
{
        int             saverr, fd, i, num_lines;
        char            *lbuf, *p;
        const char      *plim;
        char            filename[PATH_MAX];
        struct stat     st;
        size_t          namesize, bufsize;

        /*
         * Slurp the locale file into the cache.
         */
        namesize = strlen(name) + 1;

        /* 'PathLocale' must be already set & checked. */

        (void) snprintf(filename, sizeof (filename), "%s/%s/%s/LCL_DATA",
            _PathLocale, name, category_filename);

        if ((fd = open(filename, O_RDONLY)) < 0)
                return (_LDP_ERROR);
        if (fstat(fd, &st) != 0)
                goto bad_locale;
        if (st.st_size <= 0) {
                errno = EINVAL;
                goto bad_locale;
        }
        bufsize = namesize + st.st_size;
        if ((lbuf = libc_malloc(bufsize)) == NULL) {
                errno = ENOMEM;
                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;
        /*
         * Parse the locale file into localebuf.
         */
        if (plim[-1] != '\n') {
                errno = EINVAL;
                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 {
                errno = EINVAL;
                goto bad_lbuf;
        }
        (void) close(fd);
        /*
         * Record the successful parse in the cache.
         */
        *locale_buf = lbuf;
        for (p = *locale_buf, i = 0; i < num_lines; i++)
                dst_localebuf[i] = (p += strlen(p) + 1);
        for (i = num_lines; i < locale_buf_size_max; i++)
                dst_localebuf[i] = NULL;

        return (_LDP_LOADED);

bad_lbuf:
        saverr = errno;
        free(lbuf);
        errno = saverr;
bad_locale:
        saverr = errno;
        (void) close(fd);
        errno = saverr;

        return (_LDP_ERROR);
}

static int
split_lines(char *p, const char *plim)
{
        int i;

        i = 0;
        while (p < plim) {
                if (*p == '\n') {
                        *p = '\0';
                        i++;
                }
                p++;
        }
        return (i);
}