mirror of https://github.com/cppla/ServerStatus
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
#ifndef ARGPARSE_H
|
|
#define ARGPARSE_H
|
|
|
|
/**
|
|
* Command-line arguments parsing library.
|
|
*
|
|
* This module is inspired by parse-options.c (git) and python's argparse
|
|
* module.
|
|
*
|
|
* Arguments parsing is common task in cli program, but traditional `getopt`
|
|
* libraries are not easy to use. This library provides high-level arguments
|
|
* parsing solutions.
|
|
*
|
|
* The program defines what arguments it requires, and `argparse` will figure
|
|
* out how to parse those out of `argc` and `argv`, it also automatically
|
|
* generates help and usage messages and issues errors when users give the
|
|
* program invalid arguments.
|
|
*
|
|
* Reserved namespaces:
|
|
* argparse
|
|
* OPT
|
|
* Author: Yecheng Fu <cofyc.jackson@gmail.com>
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
struct argparse;
|
|
struct argparse_option;
|
|
|
|
typedef int argparse_callback(struct argparse *this_,
|
|
const struct argparse_option *option);
|
|
|
|
enum argparse_flag {
|
|
ARGPARSE_STOP_AT_NON_OPTION = 1,
|
|
};
|
|
|
|
enum argparse_option_type {
|
|
/* special */
|
|
ARGPARSE_OPT_END,
|
|
/* options with no arguments */
|
|
ARGPARSE_OPT_BOOLEAN,
|
|
ARGPARSE_OPT_BIT,
|
|
/* options with arguments (optional or required) */
|
|
ARGPARSE_OPT_INTEGER,
|
|
ARGPARSE_OPT_STRING,
|
|
};
|
|
|
|
enum argparse_option_flags {
|
|
OPT_NONEG = 1, /* Negation disabled. */
|
|
};
|
|
|
|
/*
|
|
* Argparse option struct.
|
|
*
|
|
* `type`:
|
|
* holds the type of the option, you must have an ARGPARSE_OPT_END last in your
|
|
* array.
|
|
*
|
|
* `short_name`:
|
|
* the character to use as a short option name, '\0' if none.
|
|
*
|
|
* `long_name`:
|
|
* the long option name, without the leading dash, NULL if none.
|
|
*
|
|
* `value`:
|
|
* stores pointer to the value to be filled.
|
|
*
|
|
* `help`:
|
|
* the short help message associated to what the option does.
|
|
* Must never be NULL (except for ARGPARSE_OPT_END).
|
|
*
|
|
* `callback`:
|
|
* function is called when corresponding argument is parsed.
|
|
*
|
|
* `data`:
|
|
* associated data. Callbacks can use it like they want.
|
|
*
|
|
* `flags`:
|
|
* option flags.
|
|
*
|
|
*/
|
|
struct argparse_option {
|
|
enum argparse_option_type type;
|
|
const char short_name;
|
|
const char *long_name;
|
|
void *value;
|
|
const char *help;
|
|
argparse_callback *callback;
|
|
intptr_t data;
|
|
int flags;
|
|
};
|
|
|
|
/*
|
|
* argpparse
|
|
*/
|
|
struct argparse {
|
|
// user supplied
|
|
const struct argparse_option *options;
|
|
const char *usage;
|
|
int flags;
|
|
// internal context
|
|
int argc;
|
|
const char **argv;
|
|
const char **out;
|
|
int cpidx;
|
|
const char *optvalue; // current option value
|
|
};
|
|
|
|
// builtin callbacks
|
|
int argparse_help_cb(struct argparse *this_,
|
|
const struct argparse_option *option);
|
|
|
|
// builtin option macros
|
|
#define OPT_END() { ARGPARSE_OPT_END, 0 }
|
|
#define OPT_BOOLEAN(...) { ARGPARSE_OPT_BOOLEAN, __VA_ARGS__ }
|
|
#define OPT_BIT(...) { ARGPARSE_OPT_BIT, __VA_ARGS__ }
|
|
#define OPT_INTEGER(...) { ARGPARSE_OPT_INTEGER, __VA_ARGS__ }
|
|
#define OPT_STRING(...) { ARGPARSE_OPT_STRING, __VA_ARGS__ }
|
|
#define OPT_HELP() OPT_BOOLEAN('h', "help", 0, "Show this help message and exit", argparse_help_cb)
|
|
|
|
int argparse_init(struct argparse *this_, struct argparse_option *options,
|
|
const char *usage, int flags);
|
|
int argparse_parse(struct argparse *this_, int argc, const char **argv);
|
|
void argparse_usage(struct argparse *this_);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|