getopt.c

   1 /*
   2  * This material, written by Henry Spencer, was released by him
   3  * into the public domain and is thus not subject to any copyright.
   4  */
   5
   6 #define _XOPEN_SOURCE 700
   7
   8 #include <errno.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12
  13 int
  14 main(int argc, char *argv[])
  15 {
  16         int c;
  17         int status = 0;
  18
  19         if (argc < 2) {
  20                 fprintf(stderr, "%s: no arguments given\n", argv[0]);
  21                 exit(2);
  22         }
  23
  24         optind = 2;     /* Past the program name and the option letters. */
  25         while ((c = getopt(argc, argv, argv[1])) != -1) {
  26                 switch (c) {
  27                 case '?':
  28                         status = 1;     /* getopt routine gave message */
  29                         break;
  30                 default:
  31                         if (optarg != NULL)
  32                                 printf(" -%c %s", c, optarg);
  33                         else
  34                                 printf(" -%c", c);
  35                         break;
  36                 }
  37         }
  38
  39         printf(" --");
  40         for (; optind < argc; optind++)
  41                 printf(" %s", argv[optind]);
  42         printf("\n");
  43
  44         return status;
  45 }