source: bootcd/isolinux/syslinux-6.03/gpxe/src/hci/mucurses/colour.c

#include <curses.h>

FILE_LICENCE ( GPL2_OR_LATER );

struct colour_pair {
        short fcol;
        short bcol;
};

static struct colour_pair cpairs[COLOUR_PAIRS] = {
        [0] = { COLOUR_WHITE, COLOUR_BLACK },
};

/**
 * Identify the RGB components of a given colour value
 *
 * @v colour    colour value
 * @v *red      address to store red component
 * @v *green    address to store green component
 * @v *blue     address to store blue component
 * @ret rc      return status code
 */
int colour_content ( short colour, short *red, short *green, short *blue ) {
        *red = ( ( colour & COLOUR_RED ) ? 1 : 0 );
        *green = ( ( colour & COLOUR_GREEN ) ? 1 : 0 );
        *blue = ( ( colour & COLOUR_BLUE ) ? 1 : 0 );
        return OK;
}

/**
 * Initialise colour pair
 *
 * @v pair      colour pair number
 * @v fcol      foreground colour
 * @v bcol      background colour
 */
int init_pair ( short pair, short fcol, short bcol ) {
        struct colour_pair *cpair;

        if ( ( pair < 1 ) || ( pair >= COLOUR_PAIRS ) )
                return ERR;
        
        cpair = &cpairs[pair];
        cpair->fcol = fcol;
        cpair->bcol = bcol;
        return OK;
}

/**
 * Get colours of colour pair
 *
 * @v pair      colour pair number
 * @ret fcol    foreground colour
 * @ret bcol    background colour
 */
int pair_content ( short pair, short *fcol, short *bcol ) {
        struct colour_pair *cpair;

        if ( ( pair < 0 ) || ( pair >= COLOUR_PAIRS ) )
                return ERR;
        
        cpair = &cpairs[pair];
        *fcol = cpair->fcol;
        *bcol = cpair->bcol;
        return OK;
}