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lib/55496: [libcurses] bkgrnd() doesn't works as expected
>Number: 55496
>Category: lib
>Synopsis: [libcurses] bkgrnd() doesn't works as expected
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: lib-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Jul 18 20:05:00 +0000 2020
>Originator: Naman Jain
>Release: NetBSD 9.0
>Organization:
IIT Kanpur
>Environment:
NetBSD localhost 9.0 NetBSD 9.0 (GENERIC) #0: Fri Feb 14 00:06:28 UTC 2020 mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
bkgrnd() does not work as expected.
Expected:
bkgrnd(wch) followed by refresh() should update the rendition for all the characters.
Observed:
It does not update the screen, instead just updates the value of background character.
See bkgd() for more details, which is expected to behave similarly. bkgd() works correctly.
>How-To-Repeat:
A simple program like:
#include <curses.h>
#include <wchar.h>
int main() {
initscr();
cchar_t ch;
wchar_t wstr[] = {0x61, L'\0'};
setcchar(&ch, wstr, 0x100, 0, NULL);
//bkgd(0x61);
bkgrnd(&ch);
refresh();
getch();
endwin();
return 0;
}
>Fix:
wbkgrnd() needs to update window similar(though not exactly) to what is done in wbkgd() https://github.com/NetBSD/src/blob/599004e121bc2a54553b4fd7eb35303ba09956b1/lib/libcurses/background.c#L102
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