/*      $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;
}

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