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      1 /*	$NetBSD: insch.c,v 1.29 2024/12/23 02:58:03 blymn Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1981, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)insch.c	8.2 (Berkeley) 5/4/94";
     36 #else
     37 __RCSID("$NetBSD: insch.c,v 1.29 2024/12/23 02:58:03 blymn Exp $");
     38 #endif
     39 #endif				/* not lint */
     40 
     41 #include <string.h>
     42 #include <stdlib.h>
     43 
     44 #include "curses.h"
     45 #include "curses_private.h"
     46 
     47 #ifndef _CURSES_USE_MACROS
     48 
     49 /*
     50  * insch --
     51  *	Do an insert-char on the line, leaving (cury, curx) unchanged.
     52  */
     53 int
     54 insch(chtype ch)
     55 {
     56 
     57 	return winsch(stdscr, ch);
     58 }
     59 
     60 /*
     61  * mvinsch --
     62  *	Do an insert-char on the line at (y, x).
     63  */
     64 int
     65 mvinsch(int y, int x, chtype ch)
     66 {
     67 
     68 	return mvwinsch(stdscr, y, x, ch);
     69 }
     70 
     71 /*
     72  * mvwinsch --
     73  *	Do an insert-char on the line at (y, x) in the given window.
     74  */
     75 int
     76 mvwinsch(WINDOW *win, int y, int x, chtype ch)
     77 {
     78 
     79 	if (wmove(win, y, x) == ERR)
     80 		return ERR;
     81 
     82 	return winsch(win, ch);
     83 }
     84 
     85 #endif
     86 
     87 /*
     88  * winsch --
     89  *	Do an insert-char on the line, leaving (cury, curx) unchanged.
     90  */
     91 int
     92 winsch(WINDOW *win, chtype ch)
     93 {
     94 	__LDATA	*end, *temp1, *temp2;
     95 	attr_t attr;
     96 
     97 	if (__predict_false(win == NULL))
     98 		return ERR;
     99 
    100 	if (__using_color)
    101 		attr = win->battr & __COLOR;
    102 	else
    103 		attr = 0;
    104 	end = &win->alines[win->cury]->line[win->curx];
    105 	temp1 = &win->alines[win->cury]->line[win->maxx - 1];
    106 	temp2 = temp1 - 1;
    107 	while (temp1 > end) {
    108 		(void)memcpy(temp1, temp2, sizeof(__LDATA));
    109 		temp1--, temp2--;
    110 	}
    111 	temp1->ch = (wchar_t)ch & __CHARTEXT;
    112 	if (temp1->ch == win->bch) {
    113 		temp1->ch = win->bch;
    114 		temp1->cflags &= ~CA_CONTINUATION;
    115 		temp1->cflags |= CA_BACKGROUND;
    116 	} else {
    117 		temp1->cflags &= ~ CA_BACKGROUND;
    118 	}
    119 
    120 	temp1->attr = (attr_t) ch & __ATTRIBUTES;
    121 	if (temp1->attr & __COLOR)
    122 		temp1->attr |= (win->battr & ~__COLOR);
    123 	else
    124 		temp1->attr |= win->battr;
    125 #ifdef HAVE_WCHAR
    126 	if (_cursesi_copy_nsp(win->bnsp, temp1) == ERR)
    127 		return ERR;
    128 	temp1->wcols = 1;
    129 #endif /* HAVE_WCHAR */
    130 	__touchline(win, (int)win->cury, (int)win->curx, (int)win->maxx - 1);
    131 	if (win->cury == LINES - 1 &&
    132 	    (win->alines[LINES - 1]->line[COLS - 1].ch != ' ' ||
    133 		win->alines[LINES - 1]->line[COLS - 1].attr != attr)) {
    134 		if (win->flags & __SCROLLOK) {
    135 			wrefresh(win);
    136 			scroll(win);
    137 			win->cury--;
    138 		} else
    139 			return ERR;
    140 	}
    141 	return OK;
    142 }
    143