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# Module [copt](../stc/copt.h): Command line argument parsing
This describes the API of string type *copt_get()* function for command line argument parsing.
## Types
```c
enum {
copt_no_argument = 0,
copt_required_argument = 1,
copt_optional_argument = 2
};
typedef struct {
int ind; /* equivalent to optind */
int opt; /* equivalent to optopt */
const char *arg; /* equivalent to optarg */
const char *faulty; /* points to the faulty option, if any */
int longindex; /* index of long option; or -1 if short */
...
} copt_t;
typedef struct {
const char *name;
int has_arg;
int val;
} copt_long_t;
const copt_t copt_inits;
```
## Methods
```c
copt_t copt_init(void);
int copt_get(copt_t *opt, int argc, char *argv[],
const char *shortopts, const copt_long_t *longopts);
```
## Example
```c
#include <stdio.h>
#include "stc/copt.h"
int main(int argc, char *argv[]) {
static copt_long_t long_options[] = {
{"verbose", copt_no_argument, 'V'},
{"help", copt_no_argument, 'H'},
{"add", copt_no_argument, 'a'},
{"append", copt_no_argument, 'b'},
{"delete", copt_required_argument, 'd'},
{"create", copt_required_argument, 'c'},
{"file", copt_required_argument, 'f'},
{NULL}
};
copt_t opt = copt_inits;
int c;
while ((c = copt_get(&opt, argc, argv, ":if:lr", long_options)) != -1) {
switch (c) {
case 'V': case 'H':
case 'a': case 'b':
case 'd': case 'c':
case 'i': case 'l':
case 'r':
printf("option: %c\n", c);
break;
case 'f':
printf("filename: %s\n", opt.arg);
break;
case ':':
printf("option %s needs a value\n", opt.faulty);
break;
case '?':
printf("unknown option: %s\n", opt.faulty);
break;
}
}
for (; opt.ind < argc; ++opt.ind) {
printf("extra arguments: %s\n", argv[opt.ind]);
}
return 0;
}
```
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