lib/libcurses/copywin.c

   1 /*      $NetBSD: copywin.c,v 1.15 2009/07/22 16:57:14 roy Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1998-1999 Brett Lymn
   5  *                         (blymn@baea.com.au, brett_lymn@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 1.15 2009/07/22 16:57:14 roy 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         /* overwrite() and overlay() can come here with -ve srcwin coords */
  63         if (sminrow < 0) {
  64                 dminrow -= sminrow;
  65                 sminrow = 0;
  66         }
  67         if (smincol < 0) {
  68                 dmincol -= smincol;
  69                 smincol = 0;
  70         }
  71
  72         /* for symmetry allow dstwin coords to be -ve as well */
  73         if (dminrow < 0) {
  74                 sminrow -= dminrow;
  75                 dminrow = 0;
  76         }
  77         if (dmincol < 0) {
  78                 smincol -= dmincol;
  79                 dmincol = 0;
  80         }
  81
  82         /* Bound dmaxcol for both windows (should be ok for dstwin) */
  83         if (dmaxcol >= dstwin->maxx)
  84                 dmaxcol = dstwin->maxx - 1;
  85         if (smincol + (dmaxcol - dmincol) >= srcwin->maxx)
  86                 dmaxcol = srcwin->maxx + dmincol - smincol - 1;
  87         if (dmaxcol < dmincol)
  88                 /* nothing in the intersection */
  89                 return OK;
  90
  91         /* Bound dmaxrow for both windows (should be ok for dstwin) */
  92         if (dmaxrow >= dstwin->maxy)
  93                 dmaxrow = dstwin->maxy - 1;
  94         if (sminrow + (dmaxrow - dminrow) >= srcwin->maxy)
  95                 dmaxrow = srcwin->maxy + dminrow - sminrow - 1;
  96
  97 #ifdef DEBUG
  98         __CTRACE(__CTRACE_WINDOW,
  99             "copywin %s mode: from (%d,%d) to (%d,%d-%d,%d)\n",
 100             dooverlay ? "overlay" : "overwrite",
 101             sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol);
 102 #endif
 103
 104         for (; dminrow <= dmaxrow; sminrow++, dminrow++) {
 105                 sp = &srcwin->alines[sminrow]->line[smincol];
 106                 end = sp + dmaxcol - dmincol;
 107                 for (dcol = dmincol; sp <= end; dcol++, sp++) {
 108                         /* XXX: Perhaps this should check for the
 109                          * background character
 110                          */
 111                         if ((dooverlay && !isspace(sp->ch)) || !dooverlay) {
 112                                 wmove(dstwin, dminrow, dcol);
 113 #ifndef HAVE_WCHAR
 114                                 __waddch(dstwin, sp);
 115 #else
 116                                 cc.vals[0] = sp->ch;
 117                                 cc.attributes = sp->attr;
 118                                 cc.elements = 1;
 119                                 np = sp->nsp;
 120                                 if (np) {
 121                                         /* MINIX: off by one error, has to be strictly less than. */
 122                                         while (np && cc.elements <
 123                                             CURSES_CCHAR_MAX) {
 124                                                 cc.vals[cc.elements++] = np->ch;
 125                                                 np = np->next;
 126                                         }
 127                                 }
 128                                 wadd_wch(dstwin, &cc);
 129 #endif /* HAVE_WCHAR */
 130                         }
 131                 }
 132         }
 133         __touchwin(dstwin);
 134         return OK;
 135 }
 136