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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
|
/* Copyright (C) 2006-2009 G.P. Halkes
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License version 3, as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef OPTIONMACROS_H
#define OPTIONMACROS_H
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
/* INSTRUCTIONS:
- A fatal routine should be provided.
- If gettext is required, define the _ macro. Otherwise, the empty definition
here will be used. However, if the macro USE_GETTEXT is defined, the automatic
definition in this file will not be used to make sure a wrong order of
definitions is detected.
- Option parsing may change the argument vector. If this should not happen,
define the macro OPTION_STRDUP such that it allocates a copy of the string
passed to it.
- The current option (or the non-option argument) is available in the variable
optcurrent. Arguments to options are stored in optArg.
- Printing options should be done by using the "%.*s" format and
"(int) optlength, optcurrent" arguments or even better, the OPTFMT format
macro and OPTPRARG arg.
- Checking the current option can be delegated to a child parser. This can be
defined by using CHILD_PARSE_FUNCTION (forward declaraction by
CHILD_PARSE_FUNCTION_DECL). To attempt checking with the child parser, use
the macro CALL_CHILD. If the child parser handles the option, no further
option checks will be done.
A simple example argument parser is shown below:
PARSE_FUNCTION(parse_options)
OPTIONS
OPTION('f', "long-f", REQUIRED_ARG)
END_OPTION
DOUBLE_DASH
NO_MORE_OPTIONS;
END_OPTION
printf("Unknown option " OPTFMT "\n", OPTPRARG);
NO_OPTION
printf("Non-option argument: %s\n", optcurrent);
END_OPTIONS
END_FUNCTION
*/
/* Definitions to make the macro's work regardless of configuration. */
#if !defined _ && !defined USE_GETTEXT
#define _(_x) (_x)
#endif
#ifndef OPTION_STRDUP
#define OPTION_STRDUP(_x) (_x)
#define OPTION_FREE(_x) (void)optptr
#else
#define OPTION_FREE(_x) free(_x)
#endif
/** Format string for printing options. */
#define OPTFMT "%.*s"
/** Arguments for printf style functions, to be used in combination with @a OPTFMT. */
#define OPTPRARG (int)optlength, optcurrent
/** Define an option parsing function.
@param name The name of the function to define.
*/
#define PARSE_FUNCTION(name) \
void name(int argc, char **argv) { \
char *optArg; \
int optargind; \
int optnomore = 0;
/** Declare a child option parsing function.
@param name The name of the function to define.
*/
#define CHILD_PARSE_FUNCTION_DECL(name) \
int name(int argc, char **argv, char *optcurrent, char *optArg, size_t optlength, \
ArgType opttype, int _optargind);
/** Define a child option parsing function.
@param name The name of the function to define.
*/
#define CHILD_PARSE_FUNCTION(name) \
int name(int argc, char **argv, char *optcurrent, char *optArg, size_t optlength, \
ArgType opttype, int _optargind) { \
int optargind = _optargind, optcontrol = 0;
/** Signal the end of a child option parsing function. */
#define END_CHILD_FUNCTION \
return -1; \
check_next: \
if (optargind != _optargind) return 4; \
return optcontrol; \
}
/** Call a child option parsing function.
@param name The name of the function to call.
*/
#define CALL_CHILD(name) \
do { \
int retval = name(argc, argv, optcurrent, optArg, optlength, opttype, optargind); \
if (retval == -1) \
break; \
else if (retval == 4) \
optargind++; \
else if (retval == 1) \
optcontrol++; \
goto check_next; \
} while (0)
/** Indicate the start of option processing.
This is separate from @a PARSE_FUNCTION so that local variables can be defined.
*/
#define OPTIONS \
for (optargind = 1; optargind < argc; optargind++) { \
char optcontrol = 0; \
char *optcurrent, *optptr; \
(void)optptr; \
optcurrent = argv[optargind]; \
if (optcurrent[0] == '-' && !optnomore) { \
size_t optlength; \
ArgType opttype; \
\
if (optcurrent[1] == '-') { \
if ((optArg = strchr(optcurrent, '=')) == NULL) { \
optlength = strlen(optcurrent); \
} else { \
optlength = optArg - optcurrent; \
optArg++; \
} \
opttype = LONG; \
} else { \
optlength = 2; \
if (optcurrent[1] != 0 && optcurrent[2] != 0) \
optArg = optcurrent + 2; \
else \
optArg = NULL; \
opttype = SHORT; \
} \
if (optlength > INT_MAX) optlength = INT_MAX; \
next_opt:
/* The last line above is to make sure the cast to int in error messages does not overflow. */
/** Signal the start of non-switch option processing. */
#define NO_OPTION \
} \
else {
/** Signal the end of option processing. */
#define END_OPTIONS \
check_next: \
if (optcontrol == 1 || optcontrol == 3) { \
if (optcontrol == 1) { \
optptr = optcurrent = OPTION_STRDUP(optcurrent); \
} \
optcontrol = 2; \
optcurrent++; \
optcurrent[0] = '-'; \
optArg = optcurrent[2] != 0 ? optcurrent + 2 : NULL; \
goto next_opt; \
} else if (optcontrol == 2) { \
OPTION_FREE(optptr); \
} \
} \
} \
goto stop_opt_parse; \
stop_opt_parse:;
/** Signal the end of the option processing function. */
#define END_FUNCTION }
/** Internal macro to check whether the requirements regarding option arguments
have been met. */
#define CHECK_ARG(argReq) \
switch (argReq) { \
case NO_ARG: \
if (optArg != NULL) { \
if (opttype == SHORT) { \
optcontrol++; \
optArg = NULL; \
} else { \
fatal(_("Option " OPTFMT " does not take an argument\n"), OPTPRARG); \
} \
} \
break; \
case REQUIRED_ARG: \
if (optArg == NULL && (optargind + 1 >= argc)) { \
fatal(_("Option " OPTFMT " requires an argument\n"), OPTPRARG); \
} \
if (optArg == NULL) optArg = argv[++optargind]; \
break; \
default: \
break; \
}
/** Check for a short style (-o) option.
@param shortName The name of the short style option.
@param argReq Whether or not an argument is required/allowed. One of NO_ARG,
OPTIONAL_ARG or REQUIRED_ARG.
*/
#define SHORT_OPTION(shortName, argReq) \
if (opttype == SHORT && optcurrent[1] == shortName) { \
CHECK_ARG(argReq) {
/** Check for a single dash as option.
This is usually used to signal standard input/output.
*/
#define SINGLE_DASH SHORT_OPTION('\0', NO_ARG)
/** Check for a double dash as option.
This is usually used to signal the end of options.
*/
#define DOUBLE_DASH LONG_OPTION("", NO_ARG)
/** Check for a short style (-o) or long style (--option) option.
@param shortName The name of the short style option.
@param longName The name of the long style option.
@param argReq Whether or not an argument is required/allowed. One of NO_ARG,
OPTIONAL_ARG or REQUIRED_ARG.
*/
#define OPTION(shortName, longName, argReq) \
if ((opttype == SHORT && optcurrent[1] == shortName) || \
(opttype == LONG && strlen(longName) == optlength - 2 && \
strncmp(optcurrent + 2, longName, optlength - 2) == 0)) { \
CHECK_ARG(argReq) {
/** Check for a long style (--option) option.
@param longName The name of the long style option.
@param argReq Whether or not an argument is required/allowed. One of NO_ARG,
OPTIONAL_ARG or REQUIRED_ARG.
*/
#define LONG_OPTION(longName, argReq) \
if (opttype == LONG && strlen(longName) == optlength - 2 && \
strncmp(optcurrent + 2, longName, optlength - 2) == 0) { \
CHECK_ARG(argReq) {
/** Signal the end of processing for the previous (SHORT_|LONG_)OPTION. */
#define END_OPTION \
} \
goto check_next; \
}
/** Check for presence of a short style (-o) option and set the variable if so.
@param shortName The name of the short style option.
@param var The variable to set.
*/
#define BOOLEAN_SHORT_OPTION(shortName, var) \
SHORT_OPTION(shortName, NO_ARG) var = 1; \
END_OPTION
/** Check for presence of a long style (--option) option and set the variable if so.
@param longName The name of the long style option.
@param var The variable to set.
*/
#define BOOLEAN_LONG_OPTION(longName, var) \
LONG_OPTION(longName, NO_ARG) var = 1; \
END_OPTION
/** Check for presence of a short style (-o) or long style (--option) option
and set the variable if so.
@param shortName The name of the short style option.
@param longName The name of the long style option.
@param var The variable to set.
*/
#define BOOLEAN_OPTION(shortName, longName, var) \
OPTION(shortName, longName, NO_ARG) var = 1; \
END_OPTION
/** Tell option processor that all further arguments are non-option arguments. */
#define NO_MORE_OPTIONS \
do { \
optnomore = 1; \
} while (0)
/** Tell option processor to jump out of option processing. */
#define STOP_OPTION_PROCESSING \
do { \
goto stop_opt_parse; \
} while (0)
/** Check an option argument for an integer value.
@param var The variable to store the result in.
@param min The minimum allowable value.
@param max The maximum allowable value.
*/
#define PARSE_INT(var, min, max) \
do { \
char *endptr; \
long value; \
errno = 0; \
\
value = strtol(optArg, &endptr, 10); \
if (*endptr != 0) { \
fatal(_("Garbage after value for " OPTFMT " option\n"), OPTPRARG); \
} \
if (errno != 0 || value < min || value > max) { \
fatal(_("Value for " OPTFMT " option (%ld) is out of range\n"), OPTPRARG, value); \
} \
var = (int)value; \
} while (0)
/** Check an option argument for a double value.
@param var The variable to store the result in.
@param min The minimum allowable value.
@param max The maximum allowable value.
*/
#define PARSE_DOUBLE(var, min, max) \
do { \
char *endptr; \
double value; \
errno = 0; \
\
value = strtod(optArg, &endptr); \
if (*endptr != 0) { \
fatal(_("Garbage after value for " OPTFMT " option\n"), OPTPRARG); \
} \
if (errno != 0 || value < min || value > max) { \
fatal(_("Value for " OPTFMT " option (%f) is out of range\n"), OPTPRARG, value); \
} \
var = value; \
} while (0)
/** Check an option argument for a boolean value.
@param var The variable to store the result in.
*/
#define PARSE_BOOLEAN(var) \
do { \
if (optArg == NULL || strcmp(optArg, "true") == 0 || strcmp(optArg, "t") == 0 || \
strcmp(optArg, "yes") == 0 || strcmp(optArg, "y") == 0 || strcmp(optArg, "1") == 0) \
(var) = 1; \
else if (strcmp(optArg, "false") == 0 || strcmp(optArg, "f") == 0 || \
strcmp(optArg, "no") == 0 || strcmp(optArg, "n") == 0 || strcmp(optArg, "0") == 0) \
(var) = 0; \
else \
fatal(_("Value for " OPTFMT " option (%s) is not a valid boolean value\n"), OPTPRARG, \
optArg); \
} while (0)
typedef enum { SHORT, LONG } ArgType;
enum { NO_ARG, OPTIONAL_ARG, REQUIRED_ARG };
#endif
|
