path: root/iconv-detect.c

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Jeffrey Stedfast <fejj@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <iconv.h>

enum {
    ISO_UNSUPPORTED          = 0,

    /* iso-8859-1 */
    ISO_DASH_D_DASH_D_LOWER  = (1 << 0),
    ISO_DASH_D_DASH_D        = (1 << 1),
    ISO_D_DASH_D             = (1 << 2),
    ISO_D_D                  = (1 << 3),
    ISO_UNDER_D_DASH_D       = (1 << 4),
    NO_ISO_D_DASH_D          = (1 << 5),

    /* iso-10646-1 */
    /*ISO_DASH_D_DASH_D_LOWER  = (1 << 0),*/
    /*ISO_DASH_D_DASH_D        = (1 << 1),*/
    /*ISO_D_DASH_D             = (1 << 2),*/
    ISO_DASH_D_LOWER           = (1 << 3),
    ISO_DASH_D                 = (1 << 4),
    ISO_D                      = (1 << 5),
    UCS4                       = (1 << 6),

    /* iso-2022-jp */
    ISO_DASH_D_DASH_S_LOWER  = (1 << 0),
    ISO_DASH_D_DASH_S        = (1 << 1),
    ISO_D_DASH_S             = (1 << 2),
};


typedef struct {
    gchar *charset;
    gchar *format;
    gint id;
} CharInfo;


static CharInfo iso8859_tests[] = {
    { "iso-8859-1",  "iso-%d-%d", ISO_DASH_D_DASH_D_LOWER },
    { "ISO-8859-1",  "ISO-%d-%d", ISO_DASH_D_DASH_D },
    { "ISO8859-1",   "ISO%d-%d",  ISO_D_DASH_D },
    { "ISO88591",    "ISO%d%d",   ISO_D_D },
    { "ISO_8859-1",  "ISO_%d-%d", ISO_UNDER_D_DASH_D },
    { "8859-1",      "%d-%d",     NO_ISO_D_DASH_D },
};

static gint num_iso8859_tests = sizeof (iso8859_tests) / sizeof (CharInfo);

static CharInfo iso2022_tests[] = {
    { "iso-2022-jp", "iso-%d-%s", ISO_DASH_D_DASH_S_LOWER },
    { "ISO-2022-JP", "ISO-%d-%s", ISO_DASH_D_DASH_S },
    { "ISO2022-JP",  "ISO%d-%s",  ISO_D_DASH_S },
};

static gint num_iso2022_tests = sizeof (iso2022_tests) / sizeof (CharInfo);

static CharInfo iso10646_tests[] = {
    { "iso-10646-1", "iso-%d-%d",  ISO_DASH_D_DASH_D_LOWER },
    { "ISO-10646-1", "ISO-%d-%d",  ISO_DASH_D_DASH_D },
    { "ISO10646-1",  "ISO%d-%d",   ISO_D_DASH_D },
    { "iso-10646",   "iso-%d",     ISO_DASH_D_LOWER },
    { "ISO-10646",   "ISO-%d",     ISO_DASH_D },
    { "ISO10646",    "ISO%d",      ISO_D },
    { "UCS-4BE",     "UCS-4BE",    UCS4 },
};

static gint num_iso10646_tests = sizeof (iso10646_tests) / sizeof (CharInfo);


gint main (gint argc, gchar **argv)
{
    guint iso8859, iso2022, iso10646;
    CharInfo *info;
    iconv_t cd;
    FILE *fp;
    gint i;

    fp = fopen ("iconv-detect.h", "w");
    if (fp == NULL)
        exit (255);

    fprintf (fp, "/* This is an auto-generated header, DO NOT EDIT! */\n\n");

    iso8859 = ISO_UNSUPPORTED;
    info = iso8859_tests;
    /*printf ("#define DEFAULT_ISO_FORMAT(iso,codepage)\t");*/
    for (i = 0; i < num_iso8859_tests; i++) {
        cd = iconv_open (info[i].charset, "UTF-8");
        if (cd != (iconv_t) -1) {
            iconv_close (cd);
            /*printf ("(\"%s\", (iso), (codepage))\n", info[i].format);*/
            fprintf (stderr, "System prefers %s\n", info[i].charset);
            iso8859 = info[i].id;
            break;
        }
    }

    if (iso8859 == ISO_UNSUPPORTED) {
        fprintf (stderr, "System doesn't support any ISO-8859-1 formats\n");
        fprintf (fp, "#define ICONV_ISO_D_FORMAT \"%s\"\n", info[0].format);
#ifdef CONFIGURE_IN
        exit (1);
#endif
    } else {
        fprintf (fp, "#define ICONV_ISO_D_FORMAT \"%s\"\n", info[i].format);
    }

    iso2022 = ISO_UNSUPPORTED;
    info = iso2022_tests;
    /*printf ("#define ISO_2022_FORMAT(iso,codepage)\t");*/
    for (i = 0; i < num_iso2022_tests; i++) {
        cd = iconv_open (info[i].charset, "UTF-8");
        if (cd != (iconv_t) -1) {
            iconv_close (cd);
            /*printf ("(\"%s\", (iso), (codepage))\n", info[i].format);*/
            fprintf (stderr, "System prefers %s\n", info[i].charset);
            iso2022 = info[i].id;
            break;
        }
    }

    if (iso2022 == ISO_UNSUPPORTED) {
        fprintf (stderr, "System doesn't support any ISO-2022 formats\n");
        fprintf (fp, "#define ICONV_ISO_S_FORMAT \"%s\"\n", info[0].format);
#ifdef CONFIGURE_IN
        exit (3);
#endif
    } else {
        fprintf (fp, "#define ICONV_ISO_S_FORMAT \"%s\"\n", info[i].format);
    }

    iso10646 = ISO_UNSUPPORTED;
    info = iso10646_tests;
    /*printf ("#define ISO_10646_FORMAT(iso,codepage)\t");*/
    for (i = 0; i < num_iso10646_tests; i++) {
        cd = iconv_open (info[i].charset, "UTF-8");
        if (cd != (iconv_t) -1) {
            iconv_close (cd);
            /*if (info[i].id < ISO_DASH_D_LOWER)
                printf ("(\"%s\", (iso), (codepage))\n", info[i].format);
            else
            printf ("(\"%s\", (iso))\n", info[i].format);*/
            fprintf (stderr, "System prefers %s\n", info[i].charset);
            iso10646 = info[i].id;
            break;
        }
    }

    /* we don't need a printf format for iso-10646 because there is only 1 */
    if (iso10646 == ISO_UNSUPPORTED) {
        fprintf (stderr, "System doesn't support any ISO-10646-1 formats\n");
        fprintf (fp, "#define ICONV_10646 \"%s\"\n", info[0].charset);
#ifdef CONFIGURE_IN
        exit (2);
#endif
    } else {
        fprintf (fp, "#define ICONV_10646 \"%s\"\n", info[i].charset);
    }

    fclose (fp);

    exit (0);
}