opt.c

/*
    macro version of getopt()
    toggles:
        -vkeq | -v -k -e -q # or any other order
    arguments:
        -p ARG | -vkeqp ARG | -pARG | -vkeqpARG

    additional macros can be added too, to
    conveniently get optional arguments, or to get a variable amount of arguments.

    the final syntax feels like an interpreted language :D
*/

#ifndef OPT_C
#define OPT_C

//specify option requires argument
#define require \
  optarg = opt_pointer + 1; \
  if (*optarg == '\0') \
  { \
    if (++optind == argc) \
      goto opt_err_arg; \
    else \
      optarg = argv[optind]; \
  } \
  opt_pointer = opt_null_terminator;

//start processing argv
#define opt \
int   optind                 = 1; \
char *opt_pointer            = argv[1]; \
char *optarg                 = NULL; \
char  opt_null_terminator[2] = {'\0','\0'}; \
if (0) \
{ \
  opt_err_arg: \
    fprintf(stderr,"option %c requires argument.\n",*opt_pointer); \
    return 1; \
  opt_err_opt: \
    fprintf(stderr,"option %c is invalid.\n",*opt_pointer); \
    return 1; \
} \
for (; optind < argc; opt_pointer = argv[++optind]) \
  if (*opt_pointer++ == '-') \
  { \
    for (;;++opt_pointer) \
      switch (*opt_pointer) \
      {

//stop processing argv
#define done \
      default: \
        if (*opt_pointer != '\0') \
          goto opt_err_opt; \
        else \
          goto opt_next; \
        break; \
      } \
    opt_next:; \
  }
#endif

#include <stdio.h>
int
main (int argc, char **argv)
{
  opt
  case 'h':
    puts ("Help");
    break;
  case 'v':
    puts ("Version");
    break;
  case 'f':require
    puts (optarg);
    break;
  done
  else puts (argv[optind]); //any non-option arguments

  return 0;
}