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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: mdwopt.h,v 1.4 1999/05/15 10:25:38 mdw Exp $ |
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4 | * |
5 | * Options parsing, similar to GNU @getopt_long@ |
6 | * |
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7 | * (c) 1996 Straylight/Edgeware |
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8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of many programs. |
13 | * |
14 | * `mdwopt' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * `mdwopt' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
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25 | * License along with `mdwopt'; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
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28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: mdwopt.h,v $ |
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33 | * Revision 1.4 1999/05/15 10:25:38 mdw |
34 | * Fix copyright information. |
35 | * |
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36 | * Revision 1.3 1999/05/14 18:51:42 mdw |
37 | * Reformat the LGPL notice slightly. |
38 | * |
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39 | * Revision 1.2 1999/05/13 22:57:23 mdw |
40 | * Change `-ise' to `-ize' throughout. |
41 | * |
42 | * Revision 1.1.1.1 1999/05/05 19:23:47 mdw |
43 | * New import. The old CVS repository was lost in a disk disaster. |
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44 | * |
45 | * --- Previous lives --- |
46 | * |
47 | * %Log: mdwopt.h,v % |
48 | * Revision 1.5 1997/08/09 20:27:59 mdw |
49 | * Fix spelling of `Licensing'. |
50 | * |
51 | * Revision 1.4 1997/07/29 21:11:49 mdw |
52 | * Fixed address of the FSF. |
53 | * |
54 | * Revision 1.3 1996/12/31 19:41:33 mdw |
55 | * Formatting changes. |
56 | * |
57 | * Revision 1.2 1996/11/23 00:47:25 mdw |
58 | * Added `MdwOpt' object from the `anagram' source code. |
59 | * |
60 | * Revision 1.1 1996/09/24 18:01:43 mdw |
61 | * Initial revision |
62 | * |
63 | */ |
64 | |
65 | #ifndef MDWOPT_H |
66 | #define MDWOPT_H |
67 | |
68 | /*----- Options handling structures ---------------------------------------*/ |
69 | |
70 | #ifdef __cplusplus |
71 | extern "C" { |
72 | #endif |
73 | |
74 | /* --- @mdwopt_data@ --- * |
75 | * |
76 | * Contains all the information needed by the @mdwopt@ routine to do its |
77 | * work. |
78 | */ |
79 | |
80 | typedef struct { |
81 | /* --- Public variables --- */ |
82 | |
83 | char *arg; /* Arg of current option, or 0 */ |
84 | int opt; /* Value of current option */ |
85 | int ind; /* 0 for init, index when done */ |
86 | int err; /* Set nonzero for error messages */ |
87 | char *prog; /* Program name (from @argv[0]@) */ |
88 | |
89 | /* --- Private variables --- * |
90 | * |
91 | * Don't play with these, please. |
92 | */ |
93 | |
94 | char *list; /* Current short options pointer */ |
95 | int next; /* Next argument, unpermuted */ |
96 | int order; /* Ordering of options, flags */ |
97 | char *env; /* Where we are in the env var */ |
98 | char *estart; /* Pointer to env var buffer */ |
99 | } |
100 | mdwopt_data; |
101 | |
102 | /*----- Global variables --------------------------------------------------*/ |
103 | |
104 | extern mdwopt_data mdwopt_global; /* The default global data */ |
105 | |
106 | /* --- For compatibility with older programs (and prettiness) --- * |
107 | * |
108 | * The macros here access the global structure defined above. I consider it |
109 | * to be perfectly acceptable to use these macros in new code, because it |
110 | * looks nicer than playing with @mdwopt_global@. |
111 | */ |
112 | |
113 | #define optarg (mdwopt_global.arg) /* Argument of current option */ |
114 | #define optopt (mdwopt_global.opt) /* Code of current option */ |
115 | #define opterr (mdwopt_global.err) /* Zero to report error messages */ |
116 | #define optind (mdwopt_global.ind) /* Index of first non-option */ |
117 | #define optprog (mdwopt_global.prog) /* Pointer to program name */ |
118 | |
119 | /*----- Type definitions --------------------------------------------------*/ |
120 | |
121 | /* --- Long options definition table --- */ |
122 | |
123 | struct option { |
124 | const char *name; /* Name of the long option */ |
125 | int has_arg; /* Does it have an argument? */ |
126 | int *flag; /* Address of flag variable */ |
127 | int val; /* Value to store/return */ |
128 | }; |
129 | |
130 | /* --- Old-style names for argument flags in long options table --- */ |
131 | |
132 | enum { |
133 | no_argument, /* No argument required */ |
134 | required_argument, /* User must specify argument */ |
135 | optional_argument /* Argument is optional */ |
136 | }; |
137 | |
138 | /* --- New style flag names --- */ |
139 | |
140 | enum { |
141 | gFlag_argReq = 1, /* Required argument */ |
142 | gFlag_argOpt = 2, /* Optional argument */ |
143 | gFlag_switch = 4, /* OR val into flag, don't store */ |
144 | gFlag_negate = 8, /* Allow long option to be negated */ |
145 | gFlag__last_long_opt_flag = 0 /* Dummy value */ |
146 | }; |
147 | |
148 | enum { |
149 | gFlag_noLongs = 1, /* Don't read long options */ |
150 | gFlag_noShorts = 2, /* Don't read short options */ |
151 | gFlag_numbers = 4, /* Read numeric options */ |
152 | gFlag_negation = 8, /* Allow `%|+|%' for negations */ |
153 | gFlag_envVar = 16, /* Parse options from env var */ |
154 | gFlag_noProgName = 32, /* Don't set @optprog@ */ |
155 | gFlag_negNumber = 64, /* Allow negated number options */ |
156 | gFlag__last_mdwopt_flag = 0 /* Dummy value */ |
157 | }; |
158 | |
159 | enum { |
160 | gFlag_negated = 256, /* Option flag was negated by user */ |
161 | gFlag__last_return_flag = 0 /* Dummy value */ |
162 | }; |
163 | |
164 | /*----- Main code ---------------------------------------------------------*/ |
165 | |
166 | /* --- @mdwopt@ --- * |
167 | * |
168 | * Arguments: @int argc@ = number of command line arguments |
169 | * @char * const *argv@ = pointer to command line arguments |
170 | * @const char *shortopt@ = pointer to short options information |
171 | * @const struct option *longopts@ = pointer to long opts info |
172 | * @int *longind@ = where to store matched longopt |
173 | * @mdwopt_data *data@ = persistent state for the parser |
174 | * @int flags@ = various useful flags |
175 | * |
176 | * Returns: Value of option found next, or an error character, or |
177 | * @EOF@ for the last thing. |
178 | * |
179 | * Use: Reads options. The routine should be more-or-less compatible |
180 | * with standard getopts, although it provides many more |
181 | * features even than the standard GNU implementation. |
182 | * |
183 | * The precise manner of options parsing is determined by |
184 | * various flag settings, which are described below. By setting |
185 | * flag values appropriately, you can achieve behaviour very |
186 | * similar to most other getopt routines. |
187 | * |
188 | * |
189 | * How options parsing appears to users |
190 | * |
191 | * A command line consists of a number of `words' (which may |
192 | * contain spaces, according to various shell quoting |
193 | * conventions). A word may be an option, an argument to an |
194 | * option, or a non-option. An option begins with a special |
195 | * character, usually `%|-|%', although `%|+|%' is also used |
196 | * sometimes. As special exceptions, the word containing only a |
197 | * `%|-|%' is considered to be a non-option, since it usually |
198 | * represents standard input or output as a filename, and the |
199 | * word containing a double-dash `%|--|%' is used to mark all |
200 | * following words as being non-options regardless of their |
201 | * initial character. |
202 | * |
203 | * Traditionally, all words after the first non-option have been |
204 | * considered to be non-options automatically, so that options |
205 | * must be specified before filenames. However, this |
206 | * implementation can extract all the options from the command |
207 | * line regardless of their position. This can usually be |
208 | * disabled by setting one of the environment variables |
209 | * `%|POSIXLY_CORRECT|%' or `%|_POSIX_OPTION_ORDER|%'. |
210 | * |
211 | * There are two different styles of options: `short' and |
212 | * `long'. |
213 | * |
214 | * Short options are the sort which Unix has known for ages: an |
215 | * option is a single letter, preceded by a `%|-|%'. Short |
216 | * options can be joined together to save space (and possibly to |
217 | * make silly words): e.g., instead of giving options |
218 | * `%|-x.-y|%', a user could write `%|-xy|%'. Some short |
219 | * options can have arguments, which appear after the option |
220 | * letter, either immediately following, or in the next `word' |
221 | * (so an option with an argument could be written as |
222 | * `%|-o foo|%' or as `%|-ofoo|%'). Note that options with |
223 | * optional arguments must be written in the second style. |
224 | * |
225 | * When a short option controls a flag setting, it is sometimes |
226 | * possible to explicitly turn the flag off, as well as turning |
227 | * it on, (usually to override default options). This is |
228 | * usually done by using a `%|+|%' instead of a `%|-|%' to |
229 | * introduce the option. |
230 | * |
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231 | * Long options, as popularized by the GNU utilities, are given |
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232 | * long-ish memorable names, preceded by a double-dash `%|--|%'. |
233 | * Since their names are more than a single character, long |
234 | * options can't be combined in the same way as short options. |
235 | * Arguments to long options may be given either in the same |
236 | * `word', separated from the option name by an equals sign, or |
237 | * in the following `word'. |
238 | * |
239 | * Long option names can be abbreviated if necessary, as long |
240 | * as the abbreviation is unique. This means that options can |
241 | * have sensible and memorable names but still not require much |
242 | * typing from an experienced user. |
243 | * |
244 | * Like short options, long options can control flag settings. |
245 | * The options to manipulate these settings come in pairs: an |
246 | * option of the form `%|--set-flag|%' might set the flag, while |
247 | * an option of the form `%|--no-set-flag|%' might clear it. |
248 | * |
249 | * It is usual for applications to provide both short and long |
250 | * options with identical behaviour. Some applications with |
251 | * lots of options may only provide long options (although they |
252 | * will often be only two or three characters long). In this |
253 | * case, long options can be preceded with a single `%|-|%' |
254 | * character, and negated by a `%|+|%' character. |
255 | * |
256 | * Finally, some (older) programs accept arguments of the form |
257 | * `%%@.{"-"<number>}%%', to set some numerical parameter, |
258 | * typically a line count of some kind. |
259 | * |
260 | * |
261 | * How programs parse options |
262 | * |
263 | * An application parses its options by calling mdwopt |
264 | * repeatedly. Each time it is called, mdwopt returns a value |
265 | * describing the option just read, and stores information about |
266 | * the option in a data block. The value %$-1$% is returned |
267 | * when there are no more options to be read. The `%|?|%' |
268 | * character is returned when an error is encountered. |
269 | * |
270 | * Before starting to parse options, the value @data->ind@ must |
271 | * be set to 0 or 1. The value of @data->err@ can also be set, |
272 | * to choose whether errors are reported by mdwopt. |
273 | * |
274 | * The program's `@argc@' and `@argv@' arguments are passed to |
275 | * the options parser, so that it can read the command line. A |
276 | * flags word is also passed, allowing the program fine control |
277 | * over parsing. The flags are described above. |
278 | * |
279 | * Short options are described by a string, which once upon a |
280 | * time just contained the permitted option characters. Now the |
281 | * options string begins with a collection of flag characters, |
282 | * and various flag characters can be put after options |
283 | * characters to change their properties. |
284 | * |
285 | * If the first character of the short options string is |
286 | * `%|+|%', `%|-|%' or `%|!|%', the order in which options are |
287 | * read is modified, as follows: |
288 | * |
289 | * `%|+|%' forces the POSIX order to be used. As soon as a non- |
290 | * option is found, mdwopt returns %$-1$%. |
291 | * |
292 | * `%|-|%' makes mdwopt treat non-options as being `special' |
293 | * sorts of option. When a non-option word is found, the |
294 | * value 0 is returned, and the actual text of the word |
295 | * is stored as being the option's argument. |
296 | * |
297 | * `%|!|%' forces the default order to be used. The entire |
298 | * command line is scanned for options, which are |
299 | * returned in order. However, during this process, |
300 | * the options are moved in the @argv@ array, so that |
301 | * they appear before the non- options. |
302 | * |
303 | * A `%|:|%' character may be placed after the ordering flag (or |
304 | * at the very beginning if no ordering flag is given) which |
305 | * indicates that the character `%|:|%', rather than `%|?|%', |
306 | * should be returned if a missing argument error is detected. |
307 | * |
308 | * Each option in the string can be followed by a `%|+|%' sign, |
309 | * indicating that it can be negated, a `%|:|%' sign indicating |
310 | * that it requires an argument, or a `%|::|%' string, |
311 | * indicating an optional argument. Both `%|+|%' and `%|:|%' or |
312 | * `%|::|%' may be given, although the `%|+|%' must come first. |
313 | * |
314 | * If an option is found, the option character is returned to |
315 | * the caller. A pointer to an argument is stored in |
316 | * @data->arg@, or @NULL@ is stored if there was no argument. |
317 | * If a negated option was found, the option character is |
318 | * returned ORred with @gFlag_negated@ (bit 8 set). |
319 | * |
320 | * Long options are described in a table. Each entry in the |
321 | * table is of type @struct option@, and the table is terminated |
322 | * by an entry whose @name@ field is null. Each option has |
323 | * a flags word which, due to historical reasons, is called |
324 | * @has_arg@. This describes various properties of the option, |
325 | * such as what sort of argument it takes, and whether it can |
326 | * be negated. |
327 | * |
328 | * When mdwopt finds a long option, it looks the name up in the |
329 | * table. The index of the matching entry is stored in the |
330 | * @longind@ variable, passed to mdwopt (unless @longind@ is 0): |
331 | * a value of %$-1$% indicates that no long option was |
332 | * found. The behaviour is then dependent on the values in the |
333 | * table entry. If @flag@ is nonzero, it points to an integer |
334 | * to be modified by mdwopt. Usually the value in the @val@ |
335 | * field is simply stored in the @flag@ variable. If the flag |
336 | * @gFlag_switch@ is set, however, the value is combined with |
337 | * the existing value of the flags using a bitwise OR. If |
338 | * @gFlag_negate@ is set, then the flag bit will be cleared if a |
339 | * matching negated long option is found. The value 0 is |
340 | * returned. |
341 | * |
342 | * If @flag@ is zero, the value in @val@ is returned by mdwopt, |
343 | * possibly with bit 8 set if the option was negated. |
344 | * |
345 | * Arguments for long options are stored in @data->arg@, as |
346 | * before. |
347 | * |
348 | * Numeric options, if enabled, cause the value `%|#|%' to be |
349 | * returned, and the numeric value to be stored in @data->opt@. |
350 | * |
351 | * If the flag @gFlag_envVar@ is set on entry, options will be |
352 | * extracted from an environment variable whose name is built by |
353 | * capitalising all the letters of the program's name. (This |
354 | * allows a user to have different default settings for a |
355 | * program, by calling it through different symbolic links.) */ |
356 | |
357 | extern int mdwopt(int /*argc*/, char *const */*argv*/, |
358 | const char */*shortopt*/, |
359 | const struct option */*longopts*/, int */*longind*/, |
360 | mdwopt_data */*data*/, int /*flags*/); |
361 | |
362 | /* --- Macros for more commonly used routines --- */ |
363 | |
364 | #define getopt(c, v, o) mdwopt(c, v, o, 0, 0, 0, gFlag_noLongs) |
365 | #define getopt_long(c, v, o, l, li) mdwopt(c, v, o, l, li, 0, 0) |
366 | #define getopt_long_only(c, v, o, l, li) \ |
367 | mdwopt(c, v, o, l, li, 0, gFlag_noShorts) |
368 | |
369 | #ifdef __cplusplus |
370 | } |
371 | #endif |
372 | |
373 | /*----- C++ wrapper class -------------------------------------------------*/ |
374 | |
375 | #ifdef __cplusplus |
376 | |
377 | /* --- Class: @MdwOpt@ --- * |
378 | * |
379 | * Parent: --- |
380 | * |
381 | * Methods: @MdwOpt@ -- construct a new mdwopt object with the given |
382 | * arguments. These are remembered for later use. |
383 | * @arg@ -- return the argument of the current option |
384 | * arguments. These are remembered for later use. |
385 | * @arg@ -- return the argument of the current option |
386 | * @opt@ -- return the value of the current option |
387 | * @ind@ -- return the index of the next unread argument |
388 | * @longind@ -- return index of current long option in table |
389 | * @errors@ -- return or set whether we report errors to the |
390 | * user |
391 | * @prog@ -- return program name from @argv[0]@ |
392 | * @next@ -- return next option read from the table |
393 | * |
394 | * Use: A simple C++ class for encapsulating the options parser. |
395 | * The methods are all nice and simple, and extremely similar |
396 | * to the normal C interface described above. |
397 | */ |
398 | |
399 | class MdwOpt { |
400 | protected: |
401 | int argc; |
402 | char * const *argv; |
403 | const char *shortopts; |
404 | const struct option *longopts; |
405 | int long_ind; |
406 | int flags; |
407 | |
408 | mdwopt_data data; |
409 | |
410 | public: |
411 | MdwOpt(int c, char * const *v, const char *so, |
412 | const struct option *lo, int f=0) : |
413 | argc(c), argv(v), shortopts(so), longopts(lo), flags(f) { |
414 | data.ind = 0; |
415 | data.err = 1; |
416 | } |
417 | |
418 | const char *arg(void) const { return (data.arg); } |
419 | int opt(void) const { return (data.opt); } |
420 | int errors(void) const { return (data.err); } |
421 | int errors(int e) { int oe = data.err; data.err = e; return (oe); } |
422 | int ind(void) const { return (data.ind); } |
423 | int longind(void) const { return (long_ind); } |
424 | const char *prog(void) const { return (data.prog); } |
425 | |
426 | int next(void) { |
427 | return (mdwopt(argc, argv, shortopts, |
428 | longopts, &long_ind, &data, flags)); |
429 | } |
430 | }; |
431 | |
432 | #endif |
433 | |
434 | /*----- That's all, folks -------------------------------------------------*/ |
435 | |
436 | #endif |