C > Miscellaneous

Convert hexcolor to rgb decimal

Convert hexcolor to rgb decimal

#include <stdio.h>
#include <string.h>

#define PACKAGE "colconv"

int main(int argc, char *argv[]) {
 char color[7]; 
 char red[2], green[2], blue[2];
 int r, g, b;

 r = g = b = 0;

 if(argc == 1)
  fprintf(stdout, "usage: %s HEXCOLOR\n", PACKAGE), exit(1);

 if(strlen(argv[1]) != 6)
  printf("Invalid nr: %s\n", argv[1]), exit(1);
 else
  strncpy(color, argv[1], 6);

 red[0] = color[0], red[1] = color[1], red[2] = '\0';
 sscanf(red, "%X", &r); 
 printf("Red   : %d\n", r);

 green[0] = color[2], green[1] = color[3], green[2] = '\0';
 sscanf(green, "%X", &g);
 printf("Green : %d\n", g);

 blue[0] = color[4], blue[1] = color[5], blue[2] = '\0';
 sscanf(blue, "%X", &b);
 printf("Blue  : %d\n", b);

 return 0;
}