/*   $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 <ruibiao@arl.wustl.edu,ruibiao@gmail.com>.
 *
 *
 * 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;
}