port/locale/euc.c

	euc.c revision 9d04e500a2b8dcd13abf3d813c6796aecd7a9689
/*
 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved.
 * Copyright (c) 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Paul Borman at Krystal Technologies.
 *
 * 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <sys/types.h>
#include <sys/euc.h>
#include "runetype.h"
#include "mblocal.h"

static size_t   _EUC_mbrtowc_impl(wchar_t *_RESTRICT_KYWD,
    const char *_RESTRICT_KYWD,
    size_t, mbstate_t *_RESTRICT_KYWD, uint8_t, uint8_t, uint8_t, uint8_t);
static size_t   _EUC_wcrtomb_impl(char *_RESTRICT_KYWD, wchar_t,
    mbstate_t *_RESTRICT_KYWD, uint8_t, uint8_t, uint8_t, uint8_t);

static size_t   _EUC_CN_mbrtowc(wchar_t *_RESTRICT_KYWD,
            const char *_RESTRICT_KYWD,
            size_t, mbstate_t *_RESTRICT_KYWD);
static size_t   _EUC_JP_mbrtowc(wchar_t *_RESTRICT_KYWD,
            const char *_RESTRICT_KYWD,
            size_t, mbstate_t *_RESTRICT_KYWD);
static size_t   _EUC_KR_mbrtowc(wchar_t *_RESTRICT_KYWD,
            const char *_RESTRICT_KYWD,
            size_t, mbstate_t *_RESTRICT_KYWD);
static size_t   _EUC_TW_mbrtowc(wchar_t *_RESTRICT_KYWD,
            const char *_RESTRICT_KYWD,
            size_t, mbstate_t *_RESTRICT_KYWD);
static size_t   _EUC_CN_wcrtomb(char *_RESTRICT_KYWD, wchar_t,
            mbstate_t *_RESTRICT_KYWD);
static size_t   _EUC_JP_wcrtomb(char *_RESTRICT_KYWD, wchar_t,
            mbstate_t *_RESTRICT_KYWD);
static size_t   _EUC_KR_wcrtomb(char *_RESTRICT_KYWD, wchar_t,
            mbstate_t *_RESTRICT_KYWD);
static size_t   _EUC_TW_wcrtomb(char *_RESTRICT_KYWD, wchar_t,
            mbstate_t *_RESTRICT_KYWD);
static int  _EUC_mbsinit(const mbstate_t *);

typedef struct {
    wchar_t ch;
    int set;
    int want;
} _EucState;

static int
_EUC_mbsinit(const mbstate_t *ps)
{

    return (ps == NULL || ((const _EucState *)ps)->want == 0);
}

/*
 * EUC-CN uses CS0, CS1 and CS2 (4 bytes).
 */
int
_EUC_CN_init(_RuneLocale *rl)
{
    __mbrtowc = _EUC_CN_mbrtowc;
    __wcrtomb = _EUC_CN_wcrtomb;
    __mbsinit = _EUC_mbsinit;

    _CurrentRuneLocale = rl;

    __ctype[520] = 4;
    charset_is_ascii = 0;
    return (0);
}

static size_t
_EUC_CN_mbrtowc(wchar_t *_RESTRICT_KYWD pwc, const char *_RESTRICT_KYWD s,
    size_t n, mbstate_t *_RESTRICT_KYWD ps)
{
    return (_EUC_mbrtowc_impl(pwc, s, n, ps, SS2, 4, 0, 0));
}

static size_t
_EUC_CN_wcrtomb(char *_RESTRICT_KYWD s, wchar_t wc,
    mbstate_t *_RESTRICT_KYWD ps)
{
    return (_EUC_wcrtomb_impl(s, wc, ps, SS2, 4, 0, 0));
}

/*
 * EUC-KR uses only CS0 and CS1.
 */
int
_EUC_KR_init(_RuneLocale *rl)
{
    __mbrtowc = _EUC_KR_mbrtowc;
    __wcrtomb = _EUC_KR_wcrtomb;
    __mbsinit = _EUC_mbsinit;

    _CurrentRuneLocale = rl;

    __ctype[520] = 2;
    charset_is_ascii = 0;
    return (0);
}

static size_t
_EUC_KR_mbrtowc(wchar_t *_RESTRICT_KYWD pwc, const char *_RESTRICT_KYWD s,
    size_t n, mbstate_t *_RESTRICT_KYWD ps)
{
    return (_EUC_mbrtowc_impl(pwc, s, n, ps, 0, 0, 0, 0));
}

static size_t
_EUC_KR_wcrtomb(char *_RESTRICT_KYWD s, wchar_t wc,
    mbstate_t *_RESTRICT_KYWD ps)
{
    return (_EUC_wcrtomb_impl(s, wc, ps, 0, 0, 0, 0));
}

/*
 * EUC-JP uses CS0, CS1, CS2, and CS3.
 */
int
_EUC_JP_init(_RuneLocale *rl)
{
    __mbrtowc = _EUC_JP_mbrtowc;
    __wcrtomb = _EUC_JP_wcrtomb;
    __mbsinit = _EUC_mbsinit;

    _CurrentRuneLocale = rl;

    __ctype[520] = 3;
    charset_is_ascii = 0;
    return (0);
}

static size_t
_EUC_JP_mbrtowc(wchar_t *_RESTRICT_KYWD pwc, const char *_RESTRICT_KYWD s,
    size_t n, mbstate_t *_RESTRICT_KYWD ps)
{
    return (_EUC_mbrtowc_impl(pwc, s, n, ps, SS2, 2, SS3, 3));
}

static size_t
_EUC_JP_wcrtomb(char *_RESTRICT_KYWD s, wchar_t wc,
    mbstate_t *_RESTRICT_KYWD ps)
{
    return (_EUC_wcrtomb_impl(s, wc, ps, SS2, 2, SS3, 3));
}

/*
 * EUC-TW uses CS0, CS1, and CS2.
 */
int
_EUC_TW_init(_RuneLocale *rl)
{
    __mbrtowc = _EUC_TW_mbrtowc;
    __wcrtomb = _EUC_TW_wcrtomb;
    __mbsinit = _EUC_mbsinit;

    _CurrentRuneLocale = rl;

    __ctype[520] = 4;
    charset_is_ascii = 0;
    return (0);
}

static size_t
_EUC_TW_mbrtowc(wchar_t *_RESTRICT_KYWD pwc, const char *_RESTRICT_KYWD s,
    size_t n, mbstate_t *_RESTRICT_KYWD ps)
{
    return (_EUC_mbrtowc_impl(pwc, s, n, ps, SS2, 4, 0, 0));
}

static size_t
_EUC_TW_wcrtomb(char *_RESTRICT_KYWD s, wchar_t wc,
    mbstate_t *_RESTRICT_KYWD ps)
{
    return (_EUC_wcrtomb_impl(s, wc, ps, SS2, 4, 0, 0));
}

/*
 * Common EUC code.
 */

static size_t
_EUC_mbrtowc_impl(wchar_t *_RESTRICT_KYWD pwc, const char *_RESTRICT_KYWD s,
    size_t n, mbstate_t *_RESTRICT_KYWD ps,
    uint8_t cs2, uint8_t cs2width, uint8_t cs3, uint8_t cs3width)
{
    _EucState *es;
    int i, want;
    wchar_t wc;
    unsigned char ch;

    es = (_EucState *)ps;

    if (es->want < 0 || es->want > MB_CUR_MAX) {
        errno = EINVAL;
        return ((size_t)-1);
    }

    if (s == NULL) {
        s = "";
        n = 1;
        pwc = NULL;
    }

    if (n == 0)
        /* Incomplete multibyte sequence */
        return ((size_t)-2);

    if (es->want == 0) {
        /* Fast path for plain ASCII (CS0) */
        if (((ch = (unsigned char)*s) & 0x80) == 0) {
            if (pwc != NULL)
                *pwc = ch;
            return (ch != '\0' ? 1 : 0);
        }

        if (ch >= 0xa1) {
            /* CS1 */
            want = 2;
        } else if (ch == cs2) {
            want = cs2width;
        } else if (ch == cs3) {
            want = cs3width;
        } else {
            errno = EILSEQ;
            return ((size_t)-1);
        }


        es->want = want;
        es->ch = 0;
    } else {
        want = es->want;
        wc = es->ch;
    }

    for (i = 0; i < MIN(want, n); i++) {
        wc <<= 8;
        wc |= *s;
        s++;
    }
    if (i < want) {
        /* Incomplete multibyte sequence */
        es->want = want - i;
        es->ch = wc;
        return ((size_t)-2);
    }
    if (pwc != NULL)
        *pwc = wc;
    es->want = 0;
    return (wc == L'\0' ? 0 : want);
}

static size_t
_EUC_wcrtomb_impl(char *_RESTRICT_KYWD s, wchar_t wc,
    mbstate_t *_RESTRICT_KYWD ps,
    uint8_t cs2, uint8_t cs2width, uint8_t cs3, uint8_t cs3width)
{
    _EucState *es;
    int i, len;
    wchar_t nm;

    es = (_EucState *)ps;

    if (es->want != 0) {
        errno = EINVAL;
        return ((size_t)-1);
    }

    if (s == NULL)
        /* Reset to initial shift state (no-op) */
        return (1);

    if ((wc & ~0x7f) == 0) {
        /* Fast path for plain ASCII (CS0) */
        *s = (char)wc;
        return (1);
    }

    /* Determine the "length" */
    if ((unsigned)wc > 0xffffff) {
        len = 4;
    } else if ((unsigned)wc > 0xffff) {
        len = 3;
    } else if ((unsigned)wc > 0xff) {
        len = 2;
    } else {
        len = 1;
    }

    if (len > MB_CUR_MAX) {
        errno = EILSEQ;
        return ((size_t)-1);
    }

    /* This first check excludes CS1, which is implicitly valid. */
    if ((wc < 0xa100) || (wc > 0xffff)) {
        /* Check for valid CS2 or CS3 */
        nm = (wc >> ((len - 1) * 8));
        if (nm == cs2) {
            if (len != cs2width) {
                errno = EILSEQ;
                return ((size_t)-1);
            }
        } else if (nm == cs3) {
            if (len != cs3width) {
                errno = EILSEQ;
                return ((size_t)-1);
            }
        } else {
            errno = EILSEQ;
            return ((size_t)-1);
        }
    }

    /* Stash the bytes, least significant last */
    for (i = len - 1; i >= 0; i--) {
        s[i] = (wc & 0xff);
        wc >>= 8;
    }
    return (len);
}