/*      $NetBSD: citrus_none.c,v 1.23 2019/07/28 13:52:23 christos Exp $        */

/*-
 * Copyright (c)2002 Citrus Project,
 * 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 <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_none.c,v 1.23 2019/07/28 13:52:23 christos Exp $");
#endif /* LIBC_SCCS and not lint */

#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <wchar.h>
#include <sys/types.h>

#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_ctype.h"
#include "citrus_none.h"
#include "citrus_stdenc.h"

/* ---------------------------------------------------------------------- */

_CITRUS_CTYPE_DECLS(NONE);
_CITRUS_CTYPE_DEF_OPS(NONE);


/* ---------------------------------------------------------------------- */

static int
/*ARGSUSED*/
_citrus_NONE_ctype_init(void ** __restrict cl, void * __restrict var,
                        size_t lenvar, size_t lenps)
{
        *cl = NULL;
        return (0);
}

static void
/*ARGSUSED*/
_citrus_NONE_ctype_uninit(void *cl)
{
}

static unsigned
/*ARGSUSED*/
_citrus_NONE_ctype_get_mb_cur_max(void *cl)
{
        return (1);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_mblen(void * __restrict cl, const char * __restrict s,
                         size_t n, int * __restrict nresult)
{
        if (!s) {
                *nresult = 0; /* state independent */
                return (0);
        }
        if (n==0) {
                *nresult = -1;
                return (EILSEQ);
        }
        *nresult = (*s == 0) ? 0 : 1;
        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_mbrlen(void * __restrict cl, const char * __restrict s,
                          size_t n, void * __restrict pspriv,
                          size_t * __restrict nresult)
{
        if (!s) {
                *nresult = 0;
                return (0);
        }
        if (n==0) {
                *nresult = (size_t)-2;
                return (0);
        }
        *nresult = (*s == 0) ? 0 : 1;
        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_mbrtowc(void * __restrict cl, wchar_t * __restrict pwc,
                           const char * __restrict s, size_t n,
                           void * __restrict pspriv,
                           size_t * __restrict nresult)
{
        if (s == NULL) {
                *nresult = 0;
                return (0);
        }
        if (n == 0) {
                *nresult = (size_t)-2;
                return (0);
        }

        if (pwc != NULL)
                *pwc = (wchar_t)(unsigned char) *s;

        *nresult = *s == '\0' ? 0 : 1;
        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_mbsinit(void * __restrict cl,
                           const void * __restrict pspriv,
                           int * __restrict nresult)
{
        *nresult = 1;  /* always initial state */
        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_mbsrtowcs(void * __restrict cl, wchar_t * __restrict pwcs,
                             const char ** __restrict s, size_t n,
                             void * __restrict pspriv,
                             size_t * __restrict nresult)
{
        int cnt;
        const char *s0;

        /* if pwcs is NULL, ignore n */
        if (pwcs == NULL)
                n = 1; /* arbitrary >0 value */

        cnt = 0;
        s0 = *s; /* to keep *s unchanged for now, use copy instead. */
        while (n > 0) {
                if (pwcs != NULL) {
                        *pwcs = (wchar_t)(unsigned char)*s0;
                }
                if (*s0 == '\0') {
                        s0 = NULL;
                        break;
                }
                s0++;
                if (pwcs != NULL) {
                        pwcs++;
                        n--;
                }
                cnt++;
        }
        if (pwcs)
                *s = s0;

        *nresult = (size_t)cnt;

        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_mbsnrtowcs(_citrus_ctype_rec_t * __restrict cc,
                             wchar_t * __restrict pwcs,
                             const char ** __restrict s, size_t in, size_t n,
                             void * __restrict pspriv,
                             size_t * __restrict nresult)
{
        int cnt;
        const char *s0;

        /* if pwcs is NULL, ignore n */
        if (pwcs == NULL)
                n = 1; /* arbitrary >0 value */

        cnt = 0;
        s0 = *s; /* to keep *s unchanged for now, use copy instead. */
        while (in > 0 && n > 0) {
                if (pwcs != NULL) {
                        *pwcs = (wchar_t)(unsigned char)*s0;
                }
                if (*s0 == '\0') {
                        s0 = NULL;
                        break;
                }
                s0++;
                --in;
                if (pwcs != NULL) {
                        pwcs++;
                        n--;
                }
                cnt++;
        }
        if (pwcs)
                *s = s0;

        *nresult = (size_t)cnt;

        return (0);
}

static int
_citrus_NONE_ctype_mbstowcs(void * __restrict cl, wchar_t * __restrict wcs,
                            const char * __restrict s, size_t n,
                            size_t * __restrict nresult)
{
        const char *rs = s;

        return (_citrus_NONE_ctype_mbsrtowcs(cl, wcs, &rs, n, NULL, nresult));
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_mbtowc(void * __restrict cl, wchar_t * __restrict pwc,
                          const char * __restrict s, size_t n,
                          int * __restrict nresult)
{

        if (s == NULL) {
                *nresult = 0; /* state independent */
                return (0);
        }
        if (n == 0) {
                return (EILSEQ);
        }
        if (pwc == NULL) {
                if (*s == '\0') {
                        *nresult = 0;
                } else {
                        *nresult = 1;
                }
                return (0);
        }

        *pwc = (wchar_t)(unsigned char)*s;
        *nresult = *s == '\0' ? 0 : 1;

        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_wcrtomb(void * __restrict cl, char * __restrict s,
                           wchar_t wc, void * __restrict pspriv,
                           size_t * __restrict nresult)
{
        if ((wc&~0xFFU) != 0) {
                *nresult = (size_t)-1;
                return (EILSEQ);
        }

        *nresult = 1;
        if (s!=NULL)
                *s = (char)wc;

        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_wcsrtombs(void * __restrict cl, char * __restrict s,
                             const wchar_t ** __restrict pwcs, size_t n,
                             void * __restrict pspriv,
                             size_t * __restrict nresult)
{
        size_t count;
        const wchar_t *pwcs0;

        pwcs0 = *pwcs;
        count = 0;

        if (s == NULL)
                n = 1;

        while (n > 0) {
                if ((*pwcs0 & ~0xFFU) != 0) {
                        *pwcs = pwcs0;
                        *nresult = (size_t)-1;
                        return (EILSEQ);
                }
                if (s != NULL) {
                        *s++ = (char)*pwcs0;
                        n--;
                }
                if (*pwcs0 == L'\0') {
                        pwcs0 = NULL;
                        break;
                }
                count++;
                pwcs0++;
        }
        if (s != NULL)
                *pwcs = pwcs0;

        *nresult = count;

        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_wcsnrtombs(_citrus_ctype_rec_t * __restrict cc,
                             char * __restrict s,
                             const wchar_t ** __restrict pwcs, size_t in,
                             size_t n, void * __restrict pspriv,
                             size_t * __restrict nresult)
{
        size_t count;
        const wchar_t *pwcs0;

        pwcs0 = *pwcs;
        count = 0;

        if (s == NULL)
                n = 1;

        while (in > 0 && n > 0) {
                if ((*pwcs0 & ~0xFFU) != 0) {
                        *nresult = (size_t)-1;
                        return (EILSEQ);
                }
                if (s != NULL) {
                        *s++ = (char)*pwcs0;
                        n--;
                }
                if (*pwcs0 == L'\0') {
                        pwcs0 = NULL;
                        break;
                }
                count++;
                pwcs0++;
                --in;
        }
        if (s != NULL)
                *pwcs = pwcs0;

        *nresult = count;

        return (0);
}

static int
_citrus_NONE_ctype_wcstombs(void * __restrict cl, char * __restrict s,
                            const wchar_t * __restrict pwcs, size_t n,
                            size_t * __restrict nresult)
{
        const wchar_t *rpwcs = pwcs;

        return (_citrus_NONE_ctype_wcsrtombs(cl, s, &rpwcs, n, NULL, nresult));
}

static int
_citrus_NONE_ctype_wctomb(void * __restrict cl, char * __restrict s,
                          wchar_t wc, int * __restrict nresult)
{
        int ret;
        size_t nr;

        if (s == 0) {
                /*
                 * initialize state here.
                 * (nothing to do for us.)
                 */
                *nresult = 0; /* we're state independent */
                return (0);
        }

        ret = _citrus_NONE_ctype_wcrtomb(cl, s, wc, NULL, &nr);
        *nresult = (int)nr;

        return (ret);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_btowc(_citrus_ctype_rec_t * __restrict cc,
                         int c, wint_t * __restrict wcresult)
{
        if (c == EOF || c & ~0xFF)
                *wcresult = WEOF;
        else
                *wcresult = (wint_t)c;
        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_ctype_wctob(_citrus_ctype_rec_t * __restrict cc,
                         wint_t wc, int * __restrict cresult)
{
        if (wc == WEOF || wc & ~0xFF)
                *cresult = EOF;
        else
                *cresult = (int)wc;
        return (0);
}

/* ---------------------------------------------------------------------- */

_CITRUS_STDENC_DECLS(NONE);
_CITRUS_STDENC_DEF_OPS(NONE);
struct _citrus_stdenc_traits _citrus_NONE_stdenc_traits = {
        0,      /* et_state_size */
        1,      /* mb_cur_max */
};

static int
/*ARGSUSED*/
_citrus_NONE_stdenc_init(struct _citrus_stdenc * __restrict ce,
                         const void *var, size_t lenvar,
                         struct _citrus_stdenc_traits * __restrict et)
{

        et->et_state_size = 0;
        et->et_mb_cur_max = 1;

        ce->ce_closure = NULL;

        return (0);
}

static void
/*ARGSUSED*/
_citrus_NONE_stdenc_uninit(struct _citrus_stdenc *ce)
{
}

static int
/*ARGSUSED*/
_citrus_NONE_stdenc_init_state(struct _citrus_stdenc * __restrict ce,
                               void * __restrict ps)
{
        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_stdenc_mbtocs(struct _citrus_stdenc * __restrict ce,
                           _csid_t *csid, _index_t *idx,
                           const char **s, size_t n,
                           void *ps, size_t *nresult)
{

        _DIAGASSERT(csid != NULL && idx != NULL);

        if (n<1) {
                *nresult = (size_t)-2;
                return (0);
        }

        *csid = 0;
        *idx = (_index_t)(unsigned char)*(*s)++;
        *nresult = *idx == 0 ? 0 : 1;

        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_stdenc_cstomb(struct _citrus_stdenc * __restrict ce,
                           char *s, size_t n,
                           _csid_t csid, _index_t idx,
                           void *ps, size_t *nresult)
{

        if (csid == _CITRUS_CSID_INVALID) {
                *nresult = 0;
                return (0);
        }
        if (n<1) {
                *nresult = (size_t)-1;
                return (E2BIG);
        }
        if (csid != 0 || (idx&0xFF) != idx)
                return (EILSEQ);

        *s = (char)idx;
        *nresult = 1;

        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_stdenc_mbtowc(struct _citrus_stdenc * __restrict ce,
                           _wc_t * __restrict pwc,
                           const char ** __restrict s, size_t n,
                           void * __restrict pspriv,
                           size_t * __restrict nresult)
{

        _DIAGASSERT(s != NULL);

        if (*s == NULL) {
                *nresult = 0;
                return (0);
        }
        if (n == 0) {
                *nresult = (size_t)-2;
                return (0);
        }

        if (pwc != NULL)
                *pwc = (_wc_t)(unsigned char) **s;

        *nresult = **s == '\0' ? 0 : 1;
        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_stdenc_wctomb(struct _citrus_stdenc * __restrict ce,
                           char * __restrict s, size_t n,
                           _wc_t wc, void * __restrict pspriv,
                           size_t * __restrict nresult)
{
        if ((wc&~0xFFU) != 0) {
                *nresult = (size_t)-1;
                return (EILSEQ);
        }
        if (n==0) {
                *nresult = (size_t)-1;
                return (E2BIG);
        }

        *nresult = 1;
        if (s!=NULL && n>0)
                *s = (char)wc;

        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_stdenc_put_state_reset(struct _citrus_stdenc * __restrict ce,
                                    char * __restrict s, size_t n,
                                    void * __restrict pspriv,
                                    size_t * __restrict nresult)
{

        *nresult = 0;

        return (0);
}

static int
/*ARGSUSED*/
_citrus_NONE_stdenc_get_state_desc(struct _stdenc * __restrict ce,
                                   void * __restrict ps,
                                   int id,
                                   struct _stdenc_state_desc * __restrict d)
{
        int ret = 0;

        switch (id) {
        case _STDENC_SDID_GENERIC:
                d->u.generic.state = _STDENC_SDGEN_INITIAL;
                break;
        default:
                ret = EOPNOTSUPP;
        }

        return ret;
}