ASCII Truck Generator

truckgen.c

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>

void print_n(const char *, const char *, const char *, int);

int main(int argc, char ** argv) {
  unsigned wheels = 12;
  char opt;

  while((opt = getopt(argc, argv, "hw:")) != -1) {
    switch(opt) {
      case '?':
      case ':':
      case 'h':
        fprintf(stderr, "Usage: %s [-w number of wheels]\n", * argv);
        exit(opt == 'h' ? EXIT_SUCCESS : EXIT_FAILURE);
        break;

      case 'w':
        wheels = atol(optarg);
        break;
    }
  }

  if(wheels < 4) {
    // raise(SIGSEGV);
    * ((unsigned *) 0xdeadbeef) = 0;
  }

  print_n("/", "", "--", (wheels - 2));
  print_n("|", "\\", " ", (wheels - 2) * 2);
  print_n("|", "|", " ", (wheels - 2) * 2);
  print_n("|", "~~~|", " ", (wheels - 2) * 2);
  print_n("|", "|", " ", wheels * 2 - 1);
  print_n("|", "|", "_", wheels * 2 - 1);
  print_n("", "", " O", wheels);
}

void print_n(const char * prefix, const char * suffix, const char * repeated, int n) {
  fputs(prefix, stdout);

  while(n--)
    fputs(repeated, stdout);

  fputs(suffix, stdout);
  fputs("\n", stdout);
}