Thread: Ncurses restore color on endwin()

I have colors=256.

echo $TERM
xterm-256color
-->display full color change on my last program post
TERM=xterm
echo $TERM
xterm
-->display color 0 to 7 only.

This display Error on color 7, 8 and 9

Code:

#include <ncurses.h>
  
const short colors[] =
{
    COLOR_RED, COLOR_GREEN, COLOR_YELLOW,
    COLOR_BLUE, COLOR_MAGENTA, COLOR_CYAN, COLOR_WHITE
};
 
const int num_colors = sizeof(colors) / sizeof(*colors);

WINDOW *w;
  
void set_colors(void)
{
    int i;
    initscr();
    start_color();
    use_default_colors();

    for (i = 0; i < num_colors; ++i)
    {
        init_pair(i, colors[i], COLOR_BLACK);
        attron(COLOR_PAIR(i));
        printw("COLOR %hd\n", i);
        refresh();
    }
    int j;
    for(;i<21;i++)
    {
        j=(i-10)*100;
        int r=init_color(i, 500, 1000, j);
        if (r==ERR)
            printw("ERROR COLOR %hd\n", i);
        init_pair(i, i, COLOR_BLACK);
        attron(COLOR_PAIR(i));
        printw("COLOR %hd\n", i);
        refresh();
    }
    standend();
    getch();
    endwin();
}
  
int main(void)
{
    set_colors();
    return 0;
}