understanding getopt_long()

[kristy]

I have used getopt() quite a few times, and understand the basics. I decided to look into the getopt_long() function, but there's something seriously wrong with my code. Every time the following application runs, the default option is chosen. Why isn't the case 0 chosen if it's run with --help?

#include <stdio.h>
#include <getopt.h>

extern char *optarg;
extern int optind;

int main(int argc, char *argv[]) {

	int c;
	int index = 0;
	
	static struct option opts[] = {
		{"help", 0, 0, 0},
		{0, 0, 0, 0}
	};
	
	while((c = getopt_long(argc, argv, "h", opts, &index) != -1)) {
	
		switch(c) {
			
			/*
			 * if getopt_long returned 0 a long option was chosen
			 */
			case 0:
				printf("option %s\n", opts[index].name);
				break;
				
			case 'h':
				printf("option h\n");
				break;
				
			default:
				 printf ("?? getopt returned character code %i\n", c);
				break;
		
		}
		
	}
	
	return 0;
}