struct palette_entry {
	unsigned char r;
	unsigned char g;
	unsigned char b;
};

struct palette_entry palette[256];

for (i=0; i<256; i++) {
	somecoolcolorvalue = [...]a cool color generator formula[...];
	palette[i].r = somecoolcolorvalue;
	palette[i].g = somecoolcolorvalue;
	palette[i].b = somecoolcolorvalue;
}

#include <stdio.h>

typedef struct {
    unsigned char r;
    unsigned char g;
    unsigned char b;
} color_triplet;

int main()
{
    int i;
    int red, green, blue;
    color_triplet table[256] = {{0,0,0}}; /* Initialize to all black */

    const color_triplet black = {0,0,0};
    const color_triplet white = {255,255,255};

    table[0]   = white; /* Windows reserves first color for white */
    table[255] = black; /* Windows reserves last color as black   */

    i = 20; /* first 20 and last 20 are reserved */
    for (red = 0; red <= 255; red+= 51) {/* the six values of red */
        for (green = 0; green <= 255; green += 51) {
            for (blue = 0; blue <= 255; blue+= 51) {
                table[i].r = red;
                table[i].g = green;
                table[i].b = blue;
                ++i;
            }
        }
    }
    /* 
       As far as applications are concerned, it's not really necessary
       to define first and last entries, since windows will ignore them,
       but for program purposes, I like to document them (and for
       non-windows applications, these are the values that I would
       probably select anyhow).
     */
    table[0]   = white; /* Windows reserves first color for white */
    table[255] = black; /* Windows reserves last color as black   */

    printf("Here are \"Safety Palette\" color table hexadecimal rgb entries\n");
    printf("for table values 20 through 235.\n");
    printf("(The first 20 and last 20 are reserved.)\n\n");
    printf("Reference:\n");
    printf("  http://msdn.microsoft.com/en-us/library/bb250466(VS.85).aspx\n\n");
    for (i = 20; i < 236; i++) {
        if ((i % 6) == 2) {
            printf("\n%3d: ", i);
        }
        printf(" %02x%02x%02x", table[i].r,table[i].g,table[i].b);
    }
    printf("\n");
    return 0;
}