getattrs() may return 0 when window pointer is null

[Midolikawa H.]

Thank you for developing, maintaining and supporting ncurses.

...And I have noticed that
the manual page sais getattrs() returns ERR when window pointer is null,
but in fact, this routine may return 0.

Test code (legacy_test2.c) is here:
----------------------------------------
#include <curses.h>
#include <locale.h>
#include <stdlib.h>

//compile:
// gcc -I/usr/include/ncursesw/ -D_XOPEN_SOURCE_EXTENDED legacy_test2.c 
-lncursesw

int main()
{
int ret, ret2, ret3;
//int ret4, ret5, ret6, ret7, ret8, ret9, ret10, ret11;

setlocale(LC_ALL,"");
initscr();
start_color();
cbreak(); noecho(); halfdelay(100);

printw("%s\n\n", curses_version() );

printw("sizeof(int)   %ld\n", sizeof(int));
printw("sizeof(short) %ld\n", sizeof(short));
printw("sizeof(long)  %ld\n", sizeof(long));
printw("sizeof(char)  %ld\n\n", sizeof(char));

printw("TRUE  %d\n", TRUE);
printw("FALSE %d\n", FALSE);
printw("OK    %d\n", OK);
printw("ERR   %d\n\n", ERR);

printw("attrset(...)            :%d\n", ret = attrset(WA_UNDERLINE | 
WA_REVERSE | WA_BOLD ));
printw("getattrs(stdscr)         : %d (%08X)\n", ret2 = 
getattrs(stdscr), ret2);
printw("getattrs((WINDOW *)NULL) : %d (%08X)\n", ret3 = getattrs((WINDOW 
*)NULL), ret3);
//printw("getbegx((WINDOW *)NULL) : %d (%08X)\n", ret4  = 
getbegx((WINDOW *)NULL), ret4 );
//printw("getbegy((WINDOW *)NULL) : %d (%08X)\n", ret5  = 
getbegy((WINDOW *)NULL), ret5 );
//printw("getcurx((WINDOW *)NULL) : %d (%08X)\n", ret6  = 
getcurx((WINDOW *)NULL), ret6 );
//printw("getcury((WINDOW *)NULL) : %d (%08X)\n", ret7  = 
getcury((WINDOW *)NULL), ret7 );
//printw("getmaxx((WINDOW *)NULL) : %d (%08X)\n", ret8  = 
getmaxx((WINDOW *)NULL), ret8 );
//printw("getmaxy((WINDOW *)NULL) : %d (%08X)\n", ret9  = 
getmaxy((WINDOW *)NULL), ret9 );
//printw("getparx((WINDOW *)NULL) : %d (%08X)\n", ret10 = 
getparx((WINDOW *)NULL), ret10);
//printw("getpary((WINDOW *)NULL) : %d (%08X)\n", ret11 = 
getpary((WINDOW *)NULL), ret11);

refresh();
getch();

endwin();

//printf("attrset(...) %d\n", ret);
//printf("getattrs(stdscr)         : %d (%08X)\n", ret2, ret2);
//printf("getattrs((WINDOW *)NULL) : %d (%08X)\n", ret3, ret3);

return(0);
}
----------------------------------------

PC:  DELL OPTIPLEX780
OS:  Ubuntu 16.04 LTS 64bit (Japanese Remix by Japanese Team)
APP: GNOME Terminal 3.18.3 / XTerm
VER: ncurses 6.0.20160213

Thanks foward,

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