port/locale/nextwctype.c

	nextwctype.c revision 163bd69b3c164dda2a59c7f08ca788e7d6ba9bea
/*
 * Copyright (c) 2004 Tim J. Robbins.
 * 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 "runetype.h"
#include <wchar.h>
#include <wctype.h>

wint_t
__nextwctype(wint_t wc, wctype_t wct)
{
    size_t lim;
    _RuneRange *rr = &_CurrentRuneLocale->__runetype_ext;
    _RuneEntry *base, *re;
    int noinc;

    noinc = 0;
    if (wc < _CACHED_RUNES) {
        wc++;
        while (wc < _CACHED_RUNES) {
            if (_CurrentRuneLocale->__runetype[wc] & wct)
                return (wc);
            wc++;
        }
        wc--;
    }
    if (rr->__ranges != NULL && wc < rr->__ranges[0].__min) {
        wc = rr->__ranges[0].__min;
        noinc = 1;
    }

    /* Binary search -- see bsearch.c for explanation. */
    base = rr->__ranges;
    for (lim = rr->__nranges; lim != 0; lim >>= 1) {
        re = base + (lim >> 1);
        if (re->__min <= wc && wc <= re->__max)
            goto found;
        else if (wc > re->__max) {
            base = re + 1;
            lim--;
        }
    }
    return (-1);
found:
    if (!noinc)
        wc++;
    if (re->__min <= wc && wc <= re->__max) {
        if (re->__types != NULL) {
            for (; wc <= re->__max; wc++)
                if (re->__types[wc - re->__min] & wct)
                    return (wc);
        } else if (re->__map & wct)
            return (wc);
    }
    while (++re < rr->__ranges + rr->__nranges) {
        wc = re->__min;
        if (re->__types != NULL) {
            for (; wc <= re->__max; wc++)
                if (re->__types[wc - re->__min] & wct)
                    return (wc);
        } else if (re->__map & wct)
            return (wc);
    }
    return (-1);
}