port/locale/wcsnrtombs.c

	wcsnrtombs.c revision 6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648
/*
 * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 2002-2004 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 <limits.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "mblocal.h"

size_t
wcsnrtombs(char *_RESTRICT_KYWD dst, const wchar_t **_RESTRICT_KYWD src,
    size_t nwc, size_t len, mbstate_t *_RESTRICT_KYWD ps)
{
    static mbstate_t mbs;

    if (ps == NULL)
        ps = &mbs;
    return (__wcsnrtombs(dst, src, nwc, len, ps));
}

size_t
__wcsnrtombs_std(char *_RESTRICT_KYWD dst, const wchar_t **_RESTRICT_KYWD src,
    size_t nwc, size_t len, mbstate_t *_RESTRICT_KYWD ps)
{
    mbstate_t mbsbak;
    char buf[MB_LEN_MAX];
    const wchar_t *s;
    size_t nbytes;
    size_t nb;

    s = *src;
    nbytes = 0;

    if (dst == NULL) {
        while (nwc-- > 0) {
            if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1)
                /* Invalid character - wcrtomb() sets errno. */
                return ((size_t)-1);
            else if (*s == L'\0')
                return (nbytes + nb - 1);
            s++;
            nbytes += nb;
        }
        return (nbytes);
    }

    while (len > 0 && nwc-- > 0) {
        if (len > (size_t)MB_CUR_MAX) {
            /* Enough space to translate in-place. */
            if ((nb = __wcrtomb(dst, *s, ps)) == (size_t)-1) {
                *src = s;
                return ((size_t)-1);
            }
        } else {
            /*
             * May not be enough space; use temp. buffer.
             *
             * We need to save a copy of the conversion state
             * here so we can restore it if the multibyte
             * character is too long for the buffer.
             */
            mbsbak = *ps;
            if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1) {
                *src = s;
                return ((size_t)-1);
            }
            if (nb > (int)len) {
                /* MB sequence for character won't fit. */
                *ps = mbsbak;
                break;
            }
            (void) memcpy(dst, buf, nb);
        }
        if (*s == L'\0') {
            *src = NULL;
            return (nbytes + nb - 1);
        }
        s++;
        dst += nb;
        len -= nb;
        nbytes += nb;
    }
    *src = s;
    return (nbytes);
}