/*   $NetBSD: cchar.c,v 1.12 2020/07/02 23:43:01 uwe Exp $ */

/*
* Copyright (c) 2005 The NetBSD Foundation Inc.
* All rights reserved.
*
* This code is derived from code donated to the NetBSD Foundation
* by Ruibiao Qiu <[email protected],[email protected]>.
*
*
* 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.
* 3. Neither the name of the NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: cchar.c,v 1.12 2020/07/02 23:43:01 uwe Exp $");
#endif                                            /* not lint */

#include <string.h>

#include "curses.h"
#include "curses_private.h"

/*
* getcchar --
*      get a wide-character string and rendition from a cchar_t
*/
int
getcchar(const cchar_t *wcval, wchar_t *wch, attr_t *attrs,
        short *color_pair, void *opts)
{
       wchar_t *wp;
       size_t len;

       if (__predict_false(opts != NULL))
               return ERR;

       wp = wmemchr(wcval->vals, L'\0', CCHARW_MAX);
       len = wp ? wp - wcval->vals : CCHARW_MAX;

       if (wch == NULL)
               return (int)len;

       if (attrs == NULL || color_pair == NULL)
               return ERR;

       if (len > 0) {
               *attrs = wcval->attributes;
               if (__using_color)
                       *color_pair = PAIR_NUMBER(wcval->attributes);
               else
                       *color_pair = 0;
               wmemcpy(wch, wcval->vals, len);
               wch[len] = L'\0';
       }
       return OK;
}

/*
* setcchar --
*      set cchar_t from a wide-character string and rendition
*/
int
setcchar(cchar_t *wcval, const wchar_t *wch, const attr_t attrs,
        short color_pair, const void *opts)
{
       int i;
       size_t len;

       if (__predict_false(opts != NULL))
               return ERR;

       len = wcslen(wch);
       if (len > CCHARW_MAX || (len > 1 && wcwidth(wch[0]) < 0))
               return ERR;

       /*
        * If we have a following spacing-character, stop at that point.  We
        * are only interested in adding non-spacing characters.
        */
       for (i = 1; i < len; ++i) {
               if (wcwidth(wch[i]) != 0) {
                       len = i;
                       break;
               }
       }

       memset(wcval, 0, sizeof(*wcval));
       if (len != 0) {
               wcval->attributes = attrs & ~__COLOR;
               if (__using_color && color_pair)
                       wcval->attributes |= COLOR_PAIR(color_pair);
               wcval->elements = len;
               memcpy(&wcval->vals, wch, len * sizeof(wchar_t));
       }

       return OK;
}

void
__cursesi_chtype_to_cchar(chtype in, cchar_t *out)
{
       unsigned int idx;

       if (in & __ACS_IS_WACS) {
               idx = in & __CHARTEXT;
               if (idx < NUM_ACS) {
                       memcpy(out, &_wacs_char[idx], sizeof(cchar_t));
                       out->attributes |= in & __ATTRIBUTES;
                       return;
               }
       }
       out->vals[0] = in & __CHARTEXT;
       out->attributes = in & __ATTRIBUTES;
       out->elements = 1;
}