Parsing command line options with multiple arguments [getopt?]
c, command-line-arguments, parsing
Solution
Your code was actually very, very close to working. The only thing you were missing is that `getopt` only expects you to consume one argument after `-l`, and therefore continues command line parsing following the first argument to `-l`. Since you're going behind its back and pulling off more arguments, you have to tell `getopt` where to start parsing the command line again.
`getopt` stores that information in the global variable `optind`. When I added the line:
optind = index - 1;
before the `break;` in your `l` case, your code started working.
Problem
I need my program to get several arguments from command line, the syntax is as follows: ``` getpwd -l user1 user2 ... -L -X -S... ``` So, I need to get the users behind the `-l` option. I tried using `getopt`, but without much luck, it only works when I place the other options before the `-l`: ``` getpwd -L -X -S ... -l user1 user2 ... ``` My code (for `-l` and `-S`): ``` while((c = getopt(argc, argv, "l:S")) != -1){ switch(c){ case 'l': index = optind-1; while(index < argc){ next = strdup(argv[index]); /* get login */ index++; if(next[0] != '-'){ /* check if optarg is next switch */ login[lcount++] = next; } else break; } break; case 'S': sflag++; /* other option */ break; case ':': /* error - missing operand */ fprintf(stderr, "Option -%c requires an operand\n", optopt); break; case '?': /* error - unknown option */ fprintf(stderr,"Unrecognized option: -%c\n", optopt); break; } } ``` `optopt` and `optind` are `extern int`. So, the question is: Can I use the `getopt()` function (or `getopt_long()`) ? Or do I have to write my own parser to get what I need ?