程序代码：#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main (int argc, char **argv) {
int aflag = 0;
int bflag = 0;
char *cvalue = NULL;
int index;
int c;
opterr = 0;
while ((c = getopt (argc, argv, "abc:")) != -1)
switch (c) {
case 'a':
aflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'c':
cvalue = optarg;
break;
case '?':
if (optopt == 'c')
fprintf (stderr, "Option -%c requires an argument.\n", optopt);
else if (isprint (optopt))
fprintf (stderr, "Unknown option `-%c'.\n", optopt);
else
fprintf (stderr, "Unknown option character `\\x%x'.\n", optopt);
return 1;
default:
abort ();
}
printf ("aflag = %d, bflag = %d, cvalue = %s\n", aflag, bflag, cvalue);
for (index = optind; index < argc; index++) {
printf("%d\t",index);
printf ("Non-option argument %s\n", argv[index]);
}
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main (int argc, char **argv) {
int aflag = 0;
int bflag = 0;
char *cvalue = NULL;
int index;
int c;
opterr = 0;
while ((c = getopt (argc, argv, "abc:")) != -1)
switch (c) {
case 'a':
aflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'c':
cvalue = optarg;
break;
case '?':
if (optopt == 'c')
fprintf (stderr, "Option -%c requires an argument.\n", optopt);
else if (isprint (optopt))
fprintf (stderr, "Unknown option `-%c'.\n", optopt);
else
fprintf (stderr, "Unknown option character `\\x%x'.\n", optopt);
return 1;
default:
abort ();
}
printf ("aflag = %d, bflag = %d, cvalue = %s\n", aflag, bflag, cvalue);
for (index = optind; index < argc; index++) {
printf("%d\t",index);
printf ("Non-option argument %s\n", argv[index]);
}
return 0;
}
$ ./a.out -a abc -c ddd eee
aflag = 1, bflag = 0, cvalue = (null)
2 Non-option argument abc
3 Non-option argument -c
4 Non-option argument ddd
5 Non-option argument eee
$ ./a.out -c abc -a ddd eee
aflag = 1, bflag = 0, cvalue = abc
4 Non-option argument ddd
5 Non-option argument eee
前面的数字示明 optind 的变化
[ 本帖最后由 madfrogme 于 2012-8-25 09:10 编辑 ]