In article
<1507925951.56433.1479909932210.javamail.ngm...@webmail12.arcor-online.net>,
Carsten Kunze <carsten.ku...@arcor.de> wrote:
>Brett Lymn <bl...@internode.on.net> wrote:
>
>> On Mon, Nov 21, 2016 at 10:46:50PM +0100, Carsten Kunze wrote:
>> >
>> > I want to do further tests with new hints I got from Brett. If it doesn't
>> work I'll try again to prepare a minimum example from scratch.
>> >
>>
>> Just for the record, what I suggested was try a touchwin() or touch on
>> the subwin lines in the parent window before doing the refresh on the
>> parent. The subtlety with using subwin() is that the child window
>> shares the data structures with the parent but updates on the subwin
>> don't mark the parent lines for update. This sounds a bit
>> counterintuitive but I think this was a deliberate ploy to push the
>> logic of overlapping window refresh back to the application instead of
>> building it into the library.
>
>I did use subwin() to save some bytes of memory since I don't use
>stdscr directly. If I now have to use additional touchwin() subwin()
>has performance drawbacks for me. It is fine how it is implemented
>on NetBSD, but for my use case newwin() is now better suited.
>
>So I changed all subwin() to newwin(), now the situation is the other
>way round: First tests don't show any curses issue, but now ncurses
>is unusable if wide char text is displayed (but ncurses works fine on
>OpenBSD and FreeBSD). This is OT here and would be a topic for the
>pkgsrc list of course.
>
>But there is still one general issue with curses:
>
>When I use option -fsanitize=address with gcc (nb1 20160606) 5.4.0
>a curses program crashes with heap-buffer-overflow.
>
>This time I have a small test case:
>
>Makefile:
>
>LDADD= -lcurses
>
>a.out: main.o
> $(CC) -fsanitize=address main.o $(LDADD)
>
>clean:
> rm -f main.o a.out
>
>.c.o:
> $(CC) -c $(CFLAGS) -fsanitize=address $<
>
>main.c:
>
>#include <curses.h>
>
>int
>main()
>{
> initscr();
> endwin();
> return 0;
>}
I used this as the Makefile, and I can't reproduce it (current/amd64)
$ cat Makefile
LDFLAGS=-lcurses
CFLAGS=-g -fsanitize=address
all: main
clean:
rm -f main
