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/*

 * Copyright (c) 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 <ctype.h>

#include <limits.h>

#include <stddef.h>

static const char nogrouping[] = { CHAR_MAX, '\0' };

/*

 * "3;3;-1" -> "\003\003\177"

 */

const char *

__fix_locale_grouping_str(const char *str) {

        char *src, *dst;

        char n;

        if (str == NULL || *str == '\0') {

                return nogrouping;

        }

        for (src = (char*)str, dst = (char*)str; *src != '\0'; src++) {

                /* input string examples: "3;3", "3;2;-1" */

                if (*src == ';')

                        continue;

                if (*src == '-' && *(src+1) == '1') {

                        *dst++ = CHAR_MAX;

                        src++;

                        continue;

                }

                if (!isdigit((unsigned char)*src)) {

                        /* broken grouping string */

                        return nogrouping;

                }

                /* assume all numbers <= 99 */

                n = *src - '0';

                if (isdigit((unsigned char)*(src+1))) {

                        src++;

                        n *= 10;

                        n += *src - '0';

                }

                *dst = n;

                /* NOTE: assume all input started with "0" as 'no grouping' */

                if (*dst == '\0')

                        return (dst == (char*)str) ? nogrouping : str;

                dst++;

        }

        *dst = '\0';

        return str;

}