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Using getopt() to parse input arguments in C

/ Published in: C
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This is a simple bit of code to show how you can use the "getopt()" function to parse input arguments without headaches.

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  1. void print_help()
  2. {
  3.         printf("usage:\n") ;
  4.         printf("\t\t-i set input file\n") ;
  5.         printf("\t\t-o set output file\n") ;
  6.         printf("\t\t-c set config file\n") ;
  7.         printf("\t\t-h print this help information\n") ;
  8.         printf("\t\t-v print version\n") ;
  9. }
  10.  char* input_file = NULL ;
  11.         char *query=NULL;
  12.           char opt_char=0;
  13.         while ((opt_char = getopt(argc, argv, "i:q:vh")) != -1)
  14.         {
  15.                 switch(opt_char)
  16.                 {
  17.                         case 'h':
  18.                                 print_help();
  19.                                 exit(-1);
  20.                                 break;
  21.                         case 'v':
  22.                                 print_version() ;
  23.                                 exit(-1) ;
  24.                                 break ;
  25.                         case 'i':
  26.                                 input_file= optarg ;
  27.                                 break ;
  28.                         case 'q':
  29.                                 query= optarg ;
  30.                                 break ;
  31.                         default:
  32.                                 print_help();
  33.                                 exit(-1);
  34.                                 break;
  35.                 }
  36.         }

URL: http://snippets.dzone.com/posts/show/6850

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