/*      $NetBSD: insch.c,v 1.29 2024/12/23 02:58:03 blymn Exp $ */

/*
* Copyright (c) 1981, 1993, 1994
*      The Regents of the University of California.  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.
* 3. Neither the name of the University 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 REGENTS 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
#if 0
static char sccsid[] = "@(#)insch.c     8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: insch.c,v 1.29 2024/12/23 02:58:03 blymn Exp $");
#endif
#endif                          /* not lint */

#include <string.h>
#include <stdlib.h>

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

#ifndef _CURSES_USE_MACROS

/*
* insch --
*      Do an insert-char on the line, leaving (cury, curx) unchanged.
*/
int
insch(chtype ch)
{

       return winsch(stdscr, ch);
}

/*
* mvinsch --
*      Do an insert-char on the line at (y, x).
*/
int
mvinsch(int y, int x, chtype ch)
{

       return mvwinsch(stdscr, y, x, ch);
}

/*
* mvwinsch --
*      Do an insert-char on the line at (y, x) in the given window.
*/
int
mvwinsch(WINDOW *win, int y, int x, chtype ch)
{

       if (wmove(win, y, x) == ERR)
               return ERR;

       return winsch(win, ch);
}

#endif

/*
* winsch --
*      Do an insert-char on the line, leaving (cury, curx) unchanged.
*/
int
winsch(WINDOW *win, chtype ch)
{
       __LDATA *end, *temp1, *temp2;
       attr_t attr;

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

       if (__using_color)
               attr = win->battr & __COLOR;
       else
               attr = 0;
       end = &win->alines[win->cury]->line[win->curx];
       temp1 = &win->alines[win->cury]->line[win->maxx - 1];
       temp2 = temp1 - 1;
       while (temp1 > end) {
               (void)memcpy(temp1, temp2, sizeof(__LDATA));
               temp1--, temp2--;
       }
       temp1->ch = (wchar_t)ch & __CHARTEXT;
       if (temp1->ch == win->bch) {
               temp1->ch = win->bch;
               temp1->cflags &= ~CA_CONTINUATION;
               temp1->cflags |= CA_BACKGROUND;
       } else {
               temp1->cflags &= ~ CA_BACKGROUND;
       }

       temp1->attr = (attr_t) ch & __ATTRIBUTES;
       if (temp1->attr & __COLOR)
               temp1->attr |= (win->battr & ~__COLOR);
       else
               temp1->attr |= win->battr;
#ifdef HAVE_WCHAR
       if (_cursesi_copy_nsp(win->bnsp, temp1) == ERR)
               return ERR;
       temp1->wcols = 1;
#endif /* HAVE_WCHAR */
       __touchline(win, (int)win->cury, (int)win->curx, (int)win->maxx - 1);
       if (win->cury == LINES - 1 &&
           (win->alines[LINES - 1]->line[COLS - 1].ch != ' ' ||
               win->alines[LINES - 1]->line[COLS - 1].attr != attr)) {
               if (win->flags & __SCROLLOK) {
                       wrefresh(win);
                       scroll(win);
                       win->cury--;
               } else
                       return ERR;
       }
       return OK;
}