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      1 /*	$NetBSD: copywin.c,v 1.22 2024/12/23 02:58:03 blymn Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998-1999 Brett Lymn
      5  *                         (blymn (at) baea.com.au, brett_lymn (at) yahoo.com.au)
      6  * All rights reserved.
      7  *
      8  * This code has been donated to The NetBSD Foundation by the Author.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  *
     29  *
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __RCSID("$NetBSD: copywin.c,v 1.22 2024/12/23 02:58:03 blymn Exp $");
     35 #endif				/* not lint */
     36 
     37 #include <ctype.h>
     38 #include <string.h>
     39 #include "curses.h"
     40 #include "curses_private.h"
     41 
     42 /*
     43  * copywin --
     44  *     Copy the box starting at (sminrow, smincol) with a size that
     45  *     matches the destination box (dminrow, dmincol) by (dmaxrow, dmaxcol)
     46  *     from the source window srcwin to the destination window dstwin.
     47  *     All these coordindinates are relative to the relevant window.
     48  *     If dooverlay is true then the copy is nondestructive otherwise the
     49  *     copy is destructive.
     50  */
     51 int copywin(const WINDOW *srcwin, WINDOW *dstwin,
     52 	    int sminrow, int smincol,
     53 	    int dminrow, int dmincol, int dmaxrow, int dmaxcol, int dooverlay)
     54 {
     55 	int dcol;
     56 	__LDATA *sp, *end;
     57 #ifdef HAVE_WCHAR
     58 	cchar_t cc;
     59 	nschar_t *np;
     60 #endif /* HAVE_WCHAR */
     61 
     62 	__CTRACE(__CTRACE_WINDOW,
     63 	    "copywin %s mode: from (%d,%d) to (%d,%d-%d,%d)\n",
     64 	    dooverlay ? "overlay" : "overwrite",
     65 	    sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol);
     66 
     67 	if ((srcwin == NULL) || (dstwin == NULL))
     68 		return ERR;
     69 
     70 	/* overwrite() and overlay() can come here with -ve srcwin coords */
     71 	if (sminrow < 0) {
     72 		dminrow -= sminrow;
     73 		sminrow = 0;
     74 	}
     75 	if (smincol < 0) {
     76 		dmincol -= smincol;
     77 		smincol = 0;
     78 	}
     79 
     80 	/* for symmetry allow dstwin coords to be -ve as well */
     81 	if (dminrow < 0) {
     82 		sminrow -= dminrow;
     83 		dminrow = 0;
     84 	}
     85 	if (dmincol < 0) {
     86 		smincol -= dmincol;
     87 		dmincol = 0;
     88 	}
     89 
     90 	/* Bound dmaxcol for both windows (should be ok for dstwin) */
     91 	if (dmaxcol >= dstwin->maxx)
     92 		dmaxcol = dstwin->maxx - 1;
     93 	if (smincol + (dmaxcol - dmincol) >= srcwin->maxx)
     94 		dmaxcol = srcwin->maxx + dmincol - smincol - 1;
     95 	if (dmaxcol < dmincol)
     96 		/* nothing in the intersection */
     97 		return OK;
     98 
     99 	/* Bound dmaxrow for both windows (should be ok for dstwin) */
    100 	if (dmaxrow >= dstwin->maxy)
    101 		dmaxrow = dstwin->maxy - 1;
    102 	if (sminrow + (dmaxrow - dminrow) >= srcwin->maxy)
    103 		dmaxrow = srcwin->maxy + dminrow - sminrow - 1;
    104 
    105 	__CTRACE(__CTRACE_WINDOW,
    106 	    "copywin %s mode: from (%d,%d) to (%d,%d-%d,%d)\n",
    107 	    dooverlay ? "overlay" : "overwrite",
    108 	    sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol);
    109 
    110 	for (; dminrow <= dmaxrow; sminrow++, dminrow++) {
    111 		sp = &srcwin->alines[sminrow]->line[smincol];
    112 		end = sp + dmaxcol - dmincol;
    113 	__CTRACE(__CTRACE_WINDOW, "copywin: row %d\n", sminrow);
    114 		for (dcol = dmincol; sp <= end; dcol++, sp++) {
    115 			/* XXX: Perhaps this should check for the
    116 			 * background character
    117 			 */
    118 			if ((dooverlay && !isspace(sp->ch)) || !dooverlay) {
    119 				wmove(dstwin, dminrow, dcol);
    120 	__CTRACE(__CTRACE_WINDOW, "copywin: dcol = %d\n", dcol);
    121 #ifndef HAVE_WCHAR
    122 				__waddch(dstwin, sp);
    123 #else
    124 				cc.vals[0] = sp->ch;
    125 				cc.attributes = sp->attr;
    126 				cc.elements = 1;
    127 				np = sp->nsp;
    128 				if (np) {
    129 					while (np && cc.elements <=
    130 					    CURSES_CCHAR_MAX) {
    131 						cc.vals[cc.elements++] = np->ch;
    132 						np = np->next;
    133 					}
    134 				}
    135 				wadd_wch(dstwin, &cc);
    136 #endif /* HAVE_WCHAR */
    137 			}
    138 		}
    139 	}
    140 	__touchwin(dstwin, 0);
    141 	return OK;
    142 }
    143