/*   $NetBSD: add_wchstr.c,v 1.15 2024/12/23 02:58:03 blymn 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: add_wchstr.c,v 1.15 2024/12/23 02:58:03 blymn Exp $");
#endif                          /* not lint */

#include <stdlib.h>

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

/*
 * add_wchstr --
 *  Add a wide string to stdscr starting at (_cury, _curx).
 */
int
add_wchstr(const cchar_t *wchstr)
{
        return wadd_wchnstr(stdscr, wchstr, -1);
}


/*
 * wadd_wchstr --
 *      Add a string to the given window starting at (_cury, _curx).
 */
int
wadd_wchstr(WINDOW *win, const cchar_t *wchstr)
{
        return wadd_wchnstr(win, wchstr, -1);
}


/*
 * add_wchnstr --
 *      Add a string (at most n characters) to stdscr starting
 *      at (_cury, _curx).  If n is negative, add the entire string.
 */
int
add_wchnstr(const cchar_t *wchstr, int n)
{
        return wadd_wchnstr(stdscr, wchstr, n);
}


/*
 * mvadd_wchstr --
 *      Add a string to stdscr starting at (y, x)
 */
int
mvadd_wchstr(int y, int x, const cchar_t *wchstr)
{
        return mvwadd_wchnstr(stdscr, y, x, wchstr, -1);
}


/*
 * mvwadd_wchstr --
 *      Add a string to the given window starting at (y, x)
 */
int
mvwadd_wchstr(WINDOW *win, int y, int x, const cchar_t *wchstr)
{
        return mvwadd_wchnstr(win, y, x, wchstr, -1);
}


/*
 * mvadd_wchnstr --
 *      Add a string of at most n characters to stdscr
 *      starting at (y, x).
 */
int
mvadd_wchnstr(int y, int x, const cchar_t *wchstr, int n)
{
        return mvwadd_wchnstr(stdscr, y, x, wchstr, n);
}


/*
 * mvwadd_wchnstr --
 *      Add a string of at most n characters to the given window
 *      starting at (y, x).
 */
int
mvwadd_wchnstr(WINDOW *win, int y, int x, const cchar_t *wchstr, int n)
{
        if (wmove(win, y, x) == ERR)
                return ERR;

        return wadd_wchnstr(win, wchstr, n);
}


/*
 * wadd_wchnstr --
 *      Add a string (at most n wide characters) to the given window
 *      starting at (_cury, _curx).  If n is -1, add the entire string.
 */
int
wadd_wchnstr(WINDOW *win, const cchar_t *wchstr, int n)
{
        const cchar_t *chp;
        wchar_t wc;
        int cw, x, y, sx, ex, newx, i, cnt;
        __LDATA *lp, *tp;
        nschar_t *np, *tnp;
        __LINE *lnp;

        __CTRACE(__CTRACE_INPUT,
            "wadd_wchnstr: win = %p, wchstr = %p, n = %d\n", win, wchstr, n);

        if (__predict_false(win == NULL))
                return ERR;

        if (!wchstr)
                return OK;

        /* compute length of the cchar string */
        if (n < -1)
                return ERR;
        if (n >= 0)
                for (chp = wchstr, cnt = 0; n && chp->vals[0];
                        n--, chp++, ++cnt);
        else
                for (chp = wchstr, cnt = 0; chp->vals[0]; chp++, ++cnt);
        __CTRACE(__CTRACE_INPUT, "wadd_wchnstr: len=%d\n", cnt);
        chp = wchstr;
        x = win->curx;
        y = win->cury;
        lp = &win->alines[y]->line[x];
        lnp = win->alines[y];

        cw = (*lp).wcols;
        if (cw >= 0) {
                sx = x;
        } else {
                if (wcwidth(chp->vals[0])) {
                        /* clear the partial character before cursor */
                        for (tp = lp + cw; tp < lp; tp++) {
                                tp->ch = win->bch;
                                if (_cursesi_copy_nsp(win->bnsp, tp) == ERR)
                                        return ERR;
                                tp->attr = win->battr;
                                tp->wcols = 1;
                                tp->cflags = CA_BACKGROUND;
                                np = tp->nsp;
                        }
                } else {
                        /* move to the start of current char */
                        lp += cw;
                        x += cw;
                }
                sx = x + cw;
        }
        lnp->flags |= __ISDIRTY;
        newx = sx + win->ch_off;
        if (newx < *lnp->firstchp) 
                *lnp->firstchp = newx;

        /* add characters in the string */
        ex = x;
        while (cnt) {
                x = ex;
                wc = chp->vals[0];
                __CTRACE(__CTRACE_INPUT, "wadd_wchnstr: adding %x", wc);
                cw = wcwidth(wc);
                if (cw < 0)
                        cw = 1;
                if (cw) {
                        /* spacing character */
                        __CTRACE(__CTRACE_INPUT,
                            " as a spacing char(width=%d)\n", cw);
                        if (cw > win->maxx - ex) {
                                /* clear to EOL */
                                while (ex < win->maxx) {
                                        lp->ch = win->bch;
                                        if (_cursesi_copy_nsp(win->bnsp, lp)
                                            == ERR)
                                                return ERR;
                                        lp->attr = win->battr;
                                        lp->cflags = CA_BACKGROUND;
                                        (*lp).wcols = 1;
                                        lp++, ex++;
                                }
                                ex = win->maxx - 1;
                                break;
                        }
                        /* this could combine with the insertion of
                         * non-spacing char */
                        np = lp->nsp;
                        if (np) {
                                while (np) {
                                        tnp = np->next;
                                        free(np);
                                        np = tnp;
                                }
                                lp->nsp = NULL;
                        }
                        lp->ch = chp->vals[0];
                        lp->attr = chp->attributes & WA_ATTRIBUTES;
                        lp->cflags &= ~CA_BACKGROUND;
                        (*lp).wcols = cw;
                        if (chp->elements > 1) {
                                for (i = 1; i < chp->elements; i++) {
                                        np = (nschar_t *)
                                                malloc(sizeof(nschar_t));
                                        if (!np)
                                                return ERR;
                                        np->ch = chp->vals[i];
                                        np->next = lp->nsp;
                                        lp->nsp = np;
                                }
                        }
                        lp++, ex++;
                        __CTRACE(__CTRACE_INPUT,
                            "wadd_wchnstr: ex = %d, x = %d, cw = %d\n",
                            ex, x, cw);
                        while (ex - x <= cw - 1) {
                                np = lp->nsp;
                                if (np) {
                                        while (np) {
                                                tnp = np->next;
                                                free(np);
                                                np = tnp;
                                        }
                                        lp->nsp = NULL;
                                }
                                lp->ch = chp->vals[0];
                                lp->attr = chp->attributes & WA_ATTRIBUTES;
                                lp->cflags &= ~CA_BACKGROUND;
                                lp->cflags |= CA_CONTINUATION;
                                (*lp).wcols = x - ex;
                                lp++, ex++;
                        }
                } else {
                        /* non-spacing character */
                        __CTRACE(__CTRACE_INPUT,
                            "wadd_wchnstr: as non-spacing char");
                        for (i = 0; i < chp->elements; i++) {
                                np = malloc(sizeof(nschar_t));
                                if (!np)
                                        return ERR;
                                np->ch = chp->vals[i];
                                np->next = lp->nsp;
                                lp->nsp = np;
                        }
                }
                cnt--, chp++;
        }
#ifdef DEBUG
        for (i = sx; i < ex; i++) {
                __CTRACE(__CTRACE_INPUT, "wadd_wchnstr: (%d,%d)=(%x,%x,%p)\n",
                    win->cury, i, win->alines[win->cury]->line[i].ch,
                    win->alines[win->cury]->line[i].attr,
                    win->alines[win->cury]->line[i].nsp);
        }
#endif /* DEBUG */
        lnp->flags |= __ISDIRTY;
        newx = ex + win->ch_off;
        if (newx > *lnp->lastchp)
                *lnp->lastchp = newx;
        __touchline(win, y, sx, ex);

        return OK;
}