template for a switchable command line utility (portable C)

switchtemp.c

/*
 *  switchtemp.c
 *
 *  Coded by Stefan Vogt, revised Feb 19, 2011.
 *  Released under the FreeBSD license.
 *  http://www.byteproject.net
 *
 *  template for a switchable command line utility
 *
 */

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

#define VERSION "[version 1.0]"
#define FALSE 0
#define TRUE  1
#define SWITCHCOUNT 2

// basic function
void function(void) {
	printf("\nYour function output!\n\n");
}
/* help output */
void show_help(void) {
	printf("\nUsage: switchtemp -[SWITCH] \n"\
		   "Placeholder for help text or app description.\n"\
		   "Please use one of the following switches:\n\n"\
		   "\t-f  function\n"\
		   "\t-h  help\n"\
		   "\t-v  version\n\n");
}
/* Valid switch given? */
int getopt(const char *argument, const char *option) {
	if( argument[0]=='-' && argument[1]==option[0] )
		return TRUE;
	return FALSE;
}
int main (int argc, const char * argv[]) {
	/* Call without a switch or with switch 'h'? */
	if(argc == 1 || getopt(argv[1],"h") == TRUE ) {
		show_help();
		return EXIT_FAILURE;
	}
	/* shows the application version */
	else if(getopt(argv[1],"v") == TRUE) {
		printf("\n" VERSION "\n\n");
		return EXIT_SUCCESS;
	}
	/* Switch 'f' and the correct amount of arguments? */
	else if(getopt(argv[1],"f") == TRUE &&
			(argc < SWITCHCOUNT || argc > SWITCHCOUNT) != TRUE) {
		function();
	}
	/* all other cases */
	else {
		show_help();
	}
	return EXIT_SUCCESS;
}