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Posted By

tandouri on 08/21/09


Tagged

command line cmd parsing Getopt


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getopt example

 / Published in: C
 
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  1. int parseCMD(int argc, char** argv)
  2.  
  3. {
  4.   /* variables for getopt*/
  5.   int c;
  6.   int index;
  7.  
  8.   /* configs for cmd-args*/
  9.   int aflag = 0;
  10.   int bflag = 0;
  11.   char *cvalue = NULL;
  12.  
  13.   /* this is where the magic happens*/
  14.   opterr = 0;
  15.  
  16.   while ((c = getopt (argc, argv, "xbc:")) != -1)	{
  17.     switch (c)
  18.       {
  19.       case 'x':
  20.         aflag = 1;
  21.         break;
  22.       case 'b':
  23.         bflag = 1;
  24.         break;
  25.       case 'c':
  26.         cvalue = optarg;
  27.         break;
  28.       case '?':
  29.         if (optopt == 'c')	{
  30.           fprintf (stderr, "Option -%c requires an argument.\n", optopt);
  31.         } else if (isprint (optopt))	{
  32.           fprintf (stderr, "Unknown option `-%c'.\n", optopt);
  33.         } else	{
  34.           fprintf (stderr,
  35.                   "Unknown option character `\\x%x'.\n",
  36.                   optopt);
  37.         }
  38.         return -1;
  39.       default:
  40.         abort ();
  41.       }
  42.   }
  43.  
  44.   /* check what was recognized */
  45.   printf ("aflag = %d, bflag = %d, cvalue = %s\n",
  46.           aflag,
  47.           bflag,
  48.           cvalue);
  49.  
  50.   /* error if argument not found */
  51.   for (index = optind; index < argc; index++)	{
  52.     printf ("Non-option argument %s\n", argv[index]);
  53.   }
  54.  
  55.   return 0;
  56. }

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