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#include <unistd.h>
#include <stdio.h>
#include <getopt.h>
int
main (int argc, char **argv)
{
static const struct option options[] =
{
{"required", required_argument, NULL, 'r'},
{"optional", optional_argument, NULL, 'o'},
{"none", no_argument, NULL, 'n'},
{NULL, 0, NULL, 0 }
};
int aflag = 0;
int bflag = 0;
char *cvalue = NULL;
int index;
int c;
while ((c = getopt_long (argc, argv, "abc:", options, NULL)) >= 0)
switch (c)
{
case 'a':
aflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'c':
cvalue = optarg;
break;
case '?':
fputs ("Unknown option.\n", stderr);
return 1;
default:
fprintf (stderr, "This should never happen!\n");
return 1;
case 'r':
printf ("--required %s\n", optarg);
break;
case 'o':
printf ("--optional %s\n", optarg);
break;
case 'n':
puts ("--none");
break;
}
printf ("aflag = %d, bflag = %d, cvalue = %s\n", aflag, bflag, cvalue);
for (index = optind; index < argc; index++)
printf ("Non-option argument %s\n", argv[index]);
return 0;
}
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