minix/lib/libcurses/copywin.c
Lionel Sambuc ffba9c2def Fix out of array bounds errors with -O3
When compiling with -O3 gcc seems to be a lot stricter on its checks for
index out of bounds error.

Change-Id: I5a63e1db6aa2375223ff13c6352643a9804fa93d
2013-10-08 11:43:31 +02:00

136 lines
4.2 KiB
C

/* $NetBSD: copywin.c,v 1.15 2009/07/22 16:57:14 roy Exp $ */
/*-
* Copyright (c) 1998-1999 Brett Lymn
* (blymn@baea.com.au, brett_lymn@yahoo.com.au)
* All rights reserved.
*
* This code has been donated to The NetBSD Foundation by the Author.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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: copywin.c,v 1.15 2009/07/22 16:57:14 roy Exp $");
#endif /* not lint */
#include <ctype.h>
#include <string.h>
#include "curses.h"
#include "curses_private.h"
/*
* copywin --
* Copy the box starting at (sminrow, smincol) with a size that
* matches the destination box (dminrow, dmincol) by (dmaxrow, dmaxcol)
* from the source window srcwin to the destination window dstwin.
* All these coordindinates are relative to the relevant window.
* If dooverlay is true then the copy is nondestructive otherwise the
* copy is destructive.
*/
int copywin(const WINDOW *srcwin, WINDOW *dstwin,
int sminrow, int smincol,
int dminrow, int dmincol, int dmaxrow, int dmaxcol, int dooverlay)
{
int dcol;
__LDATA *sp, *end;
#ifdef HAVE_WCHAR
cchar_t cc;
nschar_t *np;
#endif /* HAVE_WCHAR */
/* overwrite() and overlay() can come here with -ve srcwin coords */
if (sminrow < 0) {
dminrow -= sminrow;
sminrow = 0;
}
if (smincol < 0) {
dmincol -= smincol;
smincol = 0;
}
/* for symmetry allow dstwin coords to be -ve as well */
if (dminrow < 0) {
sminrow -= dminrow;
dminrow = 0;
}
if (dmincol < 0) {
smincol -= dmincol;
dmincol = 0;
}
/* Bound dmaxcol for both windows (should be ok for dstwin) */
if (dmaxcol >= dstwin->maxx)
dmaxcol = dstwin->maxx - 1;
if (smincol + (dmaxcol - dmincol) >= srcwin->maxx)
dmaxcol = srcwin->maxx + dmincol - smincol - 1;
if (dmaxcol < dmincol)
/* nothing in the intersection */
return OK;
/* Bound dmaxrow for both windows (should be ok for dstwin) */
if (dmaxrow >= dstwin->maxy)
dmaxrow = dstwin->maxy - 1;
if (sminrow + (dmaxrow - dminrow) >= srcwin->maxy)
dmaxrow = srcwin->maxy + dminrow - sminrow - 1;
#ifdef DEBUG
__CTRACE(__CTRACE_WINDOW,
"copywin %s mode: from (%d,%d) to (%d,%d-%d,%d)\n",
dooverlay ? "overlay" : "overwrite",
sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol);
#endif
for (; dminrow <= dmaxrow; sminrow++, dminrow++) {
sp = &srcwin->alines[sminrow]->line[smincol];
end = sp + dmaxcol - dmincol;
for (dcol = dmincol; sp <= end; dcol++, sp++) {
/* XXX: Perhaps this should check for the
* background character
*/
if ((dooverlay && !isspace(sp->ch)) || !dooverlay) {
wmove(dstwin, dminrow, dcol);
#ifndef HAVE_WCHAR
__waddch(dstwin, sp);
#else
cc.vals[0] = sp->ch;
cc.attributes = sp->attr;
cc.elements = 1;
np = sp->nsp;
if (np) {
/* MINIX: off-by one error, has to be strictly less than. */
while (np && cc.elements <
CURSES_CCHAR_MAX) {
cc.vals[cc.elements++] = np->ch;
np = np->next;
}
}
wadd_wch(dstwin, &cc);
#endif /* HAVE_WCHAR */
}
}
}
__touchwin(dstwin);
return OK;
}