port/locale/fix_grouping.c

/*
 * 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.
 */

/*
 * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include "lint.h"
#include <ctype.h>
#include <limits.h>
#include <stddef.h>

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

/*
 * Internal helper used to convert grouping sequences from string
 * representation into POSIX specified form, i.e.
 *
 * "3;3;-1" -> "\003\003\177\000"
 */

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);
}