1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
#ifndef _IPXE_PARSEOPT_H
#define _IPXE_PARSEOPT_H
/** @file
*
* Command line option parsing
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stddef.h>
struct net_device;
struct image;
/** A command-line option descriptor */
struct option_descriptor {
/** Long option name, if any */
const char *longopt;
/** Short option name */
char shortopt;
/** Argument requirement (as for @c struct @c option) */
uint8_t has_arg;
/** Offset of field within options structure */
uint16_t offset;
/** Parse option
*
* @v text Option text
* @v value Option value to fill in
* @ret rc Return status code
*/
int ( * parse ) ( const char *text, void *value );
};
/**
* Construct option parser
*
* @v _struct Options structure type
* @v _field Field within options structure
* @v _parse Field type-specific option parser
* @ret _parse Generic option parser
*/
#define OPTION_PARSER( _struct, _field, _parse ) \
( ( int ( * ) ( const char *text, void *value ) ) \
( ( ( ( typeof ( _parse ) * ) NULL ) == \
( ( int ( * ) ( const char *text, \
typeof ( ( ( _struct * ) NULL )->_field ) * ) ) \
NULL ) ) ? _parse : _parse ) )
/**
* Construct option descriptor
*
* @v _longopt Long option name, if any
* @v _shortopt Short option name, if any
* @v _has_arg Argument requirement
* @v _struct Options structure type
* @v _field Field within options structure
* @v _parse Field type-specific option parser
* @ret _option Option descriptor
*/
#define OPTION_DESC( _longopt, _shortopt, _has_arg, _struct, _field, _parse ) \
{ \
.longopt = _longopt, \
.shortopt = _shortopt, \
.has_arg = _has_arg, \
.offset = offsetof ( _struct, _field ), \
.parse = OPTION_PARSER ( _struct, _field, _parse ), \
}
/** A command descriptor */
struct command_descriptor {
/** Option descriptors */
struct option_descriptor *options;
/** Number of option descriptors */
uint8_t num_options;
/** Length of option structure */
uint8_t len;
/** Minimum number of non-option arguments */
uint8_t min_args;
/** Maximum number of non-option arguments */
uint8_t max_args;
/** Command usage and description
*
* This excludes the literal "Usage:" and the command name,
* which will be prepended automatically.
*/
const char *usage_description;
};
/** No maximum number of arguments */
#define MAX_ARGUMENTS 0xff
/**
* Construct command descriptor
*
* @v _struct Options structure type
* @v _options Option descriptor array
* @v _check_args Remaining argument checker
* @v _usage Command usage
* @v _description Command description
* @ret _command Command descriptor
*/
#define COMMAND_DESC( _struct, _options, _min_args, _max_args, _usage, \
_description ) \
{ \
.options = ( ( ( ( typeof ( _options[0] ) * ) NULL ) == \
( ( struct option_descriptor * ) NULL ) ) ? \
_options : _options ), \
.num_options = ( sizeof ( _options ) / \
sizeof ( _options[0] ) ), \
.len = sizeof ( _struct ), \
.min_args = _min_args, \
.max_args = _max_args, \
.usage_description = _usage "\n\n" _description, \
}
extern int parse_string ( const char *text, const char **value );
extern int parse_integer ( const char *text, unsigned int *value );
extern int parse_netdev ( const char *text, struct net_device **netdev );
extern int parse_image ( const char *text, struct image **image );
extern void print_usage ( struct command_descriptor *cmd, char **argv );
extern int parse_options ( int argc, char **argv,
struct command_descriptor *cmd, void *opts );
#endif /* _IPXE_PARSEOPT_H */
|
