port/locale/wcsxfrm.c

	wcsxfrm.c revision 4297a3b0d0a35d80f86fff155e288e885a100e6d
/*
 * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
 *      at Electronni Visti IA, Kiev, Ukraine.
 *          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 ``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 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 <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "collate.h"

static char *__mbsdup(const wchar_t *);

/*
 * Placeholder wcsxfrm() implementation. See wcscoll.c for a description of
 * the logic used.
 */
size_t
wcsxfrm(wchar_t *_RESTRICT_KYWD dest,
    const wchar_t *_RESTRICT_KYWD src, size_t len)
{
    int prim, sec, l;
    size_t slen;
    char *mbsrc, *s, *ss;

    if (*src == L'\0') {
        if (len != 0)
            *dest = L'\0';
        return (0);
    }

    if (__collate_load_error || MB_CUR_MAX > 1) {
        slen = wcslen(src);
        if (len > 0) {
            if (slen < len)
                (void) wcscpy(dest, src);
            else {
                (void) wcsncpy(dest, src, len - 1);
                dest[len - 1] = L'\0';
            }
        }
        return (slen);
    }

    mbsrc = __mbsdup(src);
    slen = 0;
    prim = sec = 0;
    ss = s = __collate_substitute(mbsrc);
    while (*s != '\0') {
        while (*s != '\0' && prim == 0) {
            __collate_lookup(s, &l, &prim, &sec);
            s += l;
        }
        if (prim != 0) {
            if (len > 1) {
                *dest++ = (wchar_t)prim;
                len--;
            }
            slen++;
            prim = 0;
        }
    }
    free(ss);
    free(mbsrc);
    if (len != 0)
        *dest = L'\0';

    return (slen);
}

static char *
__mbsdup(const wchar_t *ws)
{
    static const mbstate_t initial = { 0 };
    mbstate_t st;
    const wchar_t *wcp;
    size_t len;
    char *mbs;

    wcp = ws;
    st = initial;
    if ((len = wcsrtombs(NULL, &wcp, 0, &st)) == (size_t)-1)
        return (NULL);
    if ((mbs = malloc(len + 1)) == NULL)
        return (NULL);
    st = initial;
    (void) wcsrtombs(mbs, &ws, len + 1, &st);

    return (mbs);
}