port/locale/ldpart.c

/*
 * 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);
}