curhell2.c

/*

  CURHELL2.C
  ==========
  (c) Copyright Paul Griffiths 1999
  Email: mail@paulgriffiths.net

  "Hello, world!", ncurses style (now in colour!)

*/


#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>                  /*  for sleep()  */
#include <curses.h>


int main(void) {

    WINDOW * mainwin;


    /*  Initialize ncurses  */

    if ( (mainwin = initscr()) == NULL ) {
	fprintf(stderr, "Error initialising ncurses.\n");
	exit(EXIT_FAILURE);
    }

    start_color();                    /*  Initialize colours  */


    /*  Print message  */

    mvaddstr(6, 32, " Hello, world! ");


    /*  Make sure we are able to do what we want. If
	has_colors() returns FALSE, we cannot use colours.
	COLOR_PAIRS is the maximum number of colour pairs
	we can use. We use 13 in this program, so we check
	to make sure we have enough available.               */

    if ( has_colors() && COLOR_PAIRS >= 13 ) {

	int n = 1;


	/*  Initialize a bunch of colour pairs, where:

	        init_pair(pair number, foreground, background);

	    specifies the pair.                                  */

	init_pair(1,  COLOR_RED,     COLOR_BLACK);
	init_pair(2,  COLOR_GREEN,   COLOR_BLACK);
	init_pair(3,  COLOR_YELLOW,  COLOR_BLACK);
	init_pair(4,  COLOR_BLUE,    COLOR_BLACK);
	init_pair(5,  COLOR_MAGENTA, COLOR_BLACK);
	init_pair(6,  COLOR_CYAN,    COLOR_BLACK);
	init_pair(7,  COLOR_BLUE,    COLOR_WHITE);
	init_pair(8,  COLOR_WHITE,   COLOR_RED);
	init_pair(9,  COLOR_BLACK,   COLOR_GREEN);
	init_pair(10, COLOR_BLUE,    COLOR_YELLOW);
	init_pair(11, COLOR_WHITE,   COLOR_BLUE);
	init_pair(12, COLOR_WHITE,   COLOR_MAGENTA);
	init_pair(13, COLOR_BLACK,   COLOR_CYAN);


	/*  Use them to print of bunch of "Hello, world!"s  */

	while ( n <= 13 ) {
	    color_set(n, NULL);
	    mvaddstr(6 + n, 32, " Hello, world! ");
	    n++;
	}
    }


    /*  Refresh the screen and sleep for a
	while to get the full screen effect  */

    refresh();
    sleep(3);
    

    /*  Clean up after ourselves  */

    delwin(mainwin);
    endwin();
    refresh();

    return EXIT_SUCCESS;
}