b91e2391 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: mdwopt.c,v 1.1 1999/05/05 19:23:47 mdw Exp $ |
4 | * |
5 | * Options parsing, similar to GNU @getopt_long@ |
6 | * |
7 | * (c) 1996 Mark Wooding |
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 |
25 | * License along with `mdwopt'; if not, write to the Free Software |
26 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: mdwopt.c,v $ |
32 | * Revision 1.1 1999/05/05 19:23:47 mdw |
33 | * Initial revision |
34 | * |
35 | * --- Previous lives --- |
36 | * |
37 | * %Log: mdwopt.c,v % |
38 | * Revision 1.7 1997/09/11 09:19:11 mdw |
39 | * (mo__nextWord): Arrrgh. Don't free the environment variable buffer! |
40 | * People are still using it! |
41 | * |
42 | * Revision 1.6 1997/09/11 09:05:54 mdw |
43 | * (mo__nextWord): Fix bug which returns too many words from environment |
44 | * variables. |
45 | * |
46 | * Revision 1.5 1997/08/09 20:27:59 mdw |
47 | * Fix spelling of `Licensing'. |
48 | * |
49 | * Revision 1.4 1997/07/29 21:11:35 mdw |
50 | * Reformatted. Fixed buffer overflow when dealing with environment |
51 | * variables. Included NT in list of daft operating systems with `\' as a |
52 | * path separator. Fixed address of the FSF. |
53 | * |
54 | * Revision 1.3 1997/02/26 00:41:10 mdw |
55 | * Added GPL notice to the top. Slight formatting changes. |
56 | * |
57 | * Revision 1.2 1996/10/28 13:12:13 mdw |
58 | * Fixed calls to ctype.h routines. Arguments are cast to unsigned char |
59 | * to avoid invoking undefined behaviour caused by signedness of chars. |
60 | * |
61 | * Revision 1.1 1996/09/24 18:01:28 mdw |
62 | * Initial revision |
63 | * |
64 | */ |
65 | |
66 | /*----- External dependencies ---------------------------------------------*/ |
67 | |
68 | #include <ctype.h> |
69 | #include <stdio.h> |
70 | #include <stdlib.h> |
71 | #include <string.h> |
72 | |
73 | #include "mdwopt.h" |
74 | |
75 | /*----- Configuration things ----------------------------------------------*/ |
76 | |
77 | #if defined(__riscos) |
78 | # define PATHSEP '.' |
79 | #elif defined(__OS2__) || defined(__MSDOS__) || defined(__WINNT__) |
80 | # define PATHSEP '\\' |
81 | #else /* Assume a sane filing system */ |
82 | # define PATHSEP '/' |
83 | #endif |
84 | |
85 | /*----- Global variables --------------------------------------------------*/ |
86 | |
87 | mdwopt_data mdwopt_global = {0, 0, 0, 1, 0, 0, 0, 0, 0}; |
88 | |
89 | enum { |
90 | ord__permute = 0, /* Permute the options (default) */ |
91 | ord__return = 1, /* Return non-option things */ |
92 | ord__posix = 2, /* Do POSIX-type hacking */ |
93 | ord__negate = 4 /* Magic negate-next-thing flag */ |
94 | }; |
95 | |
96 | /*----- Main code ---------------------------------------------------------*/ |
97 | |
98 | /* --- @mo__nextWord@ --- * |
99 | * |
100 | * Arguments: @int argc@ = number of command line options |
101 | * @char *argv[]@ = pointer to command line options |
102 | * @mdwopt_data *data@ = pointer to persistent state |
103 | * |
104 | * Returns: Pointer to the next word to handle, or 0 |
105 | * |
106 | * Use: Extracts the next word from the command line or environment |
107 | * variable. |
108 | */ |
109 | |
110 | static char *mo__nextWord(int argc, char *const *argv, mdwopt_data *data) |
111 | { |
112 | if (data->ind == -1) { |
113 | char *p = data->env; |
114 | char *q; |
115 | while (isspace((unsigned char)*p)) |
116 | p++; |
117 | q = p; |
118 | while (*p && !isspace((unsigned char)*p)) |
119 | p++; |
120 | data->env = p; |
121 | if (*p) |
122 | *p++ = 0; |
123 | if (p != q) |
124 | return (q); |
125 | data->env = 0; |
126 | data->ind = 1; |
127 | } |
128 | |
129 | if (data->next == argc) |
130 | return (0); |
131 | return (argv[data->next++]); |
132 | } |
133 | |
134 | /* --- @mo__permute@ --- * |
135 | * |
136 | * Arguments: @char *argv[]@ = pointer to command line arguments |
137 | * @mdwopt_data *data@ = pointer to persistent data |
138 | * |
139 | * Returns: -- |
140 | * |
141 | * Use: Moves a command line option into the right place. |
142 | */ |
143 | |
144 | static void mo__permute(char *const *argv, mdwopt_data *data) |
145 | { |
146 | char **v = (char **)argv; |
147 | if (data->ind != -1) { |
148 | int i = data->next - 1; |
149 | char *p = v[i]; |
150 | while (i > data->ind) { |
151 | v[i] = v[i - 1]; |
152 | i--; |
153 | } |
154 | v[i] = p; |
155 | data->ind++; |
156 | } |
157 | } |
158 | |
159 | /* --- @mo__findOpt@ --- * |
160 | * |
161 | * Arguments: @int o@ = which option to search for |
162 | * @const char *shortopt@ = short options string to search |
163 | * @mdwopt_data *data@ = pointer to persistant state |
164 | * |
165 | * Returns: Pointer to rest of short options string (including magic |
166 | * characters) |
167 | * |
168 | * Use: Looks up a short option in the given string. |
169 | */ |
170 | |
171 | static const char *mo__findOpt(int o, const char *shortopt, |
172 | mdwopt_data *data) |
173 | { |
174 | const char *p = shortopt; /* Point to short opts table */ |
175 | for (;;) { |
176 | if (!*p) /* No more options left */ |
177 | return (0); |
178 | |
179 | if (o != *p || (p[1] != '+' && data->order & ord__negate)) { |
180 | p++; /* Skip this option entry */ |
181 | while (*p == '+') /* Jump a `%|+|%' sign */ |
182 | p++; |
183 | while (*p == ':') /* And jump any `%|:|%' characters */ |
184 | p++; /* Just in case there are any */ |
185 | } |
186 | else |
187 | return (p + 1); |
188 | } |
189 | } |
190 | |
191 | /* --- @mdwopt@ --- * |
192 | * |
193 | * Arguments: @int argc@ = number of command line arguments |
194 | * @char * const *argv@ = pointer to command line arguments |
195 | * @const char *shortopt@ = pointer to short options information |
196 | * @const struct option *longopts@ = pointer to long opts info |
197 | * @int *longind@ = where to store matched longopt |
198 | * @mdwopt_data *data@ = persistent state for the parser |
199 | * @int flags@ = various useful flags |
200 | * |
201 | * Returns: Value of option found next, or an error character, or |
202 | * @EOF@ for the last thing. |
203 | * |
204 | * Use: Reads options. The routine should be more-or-less compatible |
205 | * with standard getopts, although it provides many more |
206 | * features even than the standard GNU implementation. |
207 | * |
208 | * The precise manner of options parsing is determined by |
209 | * various flag settings, which are described below. By setting |
210 | * flag values appropriately, you can achieve behaviour very |
211 | * similar to most other getopt routines. |
212 | * |
213 | * |
214 | * How options parsing appears to users |
215 | * |
216 | * A command line consists of a number of `words' (which may |
217 | * contain spaces, according to various shell quoting |
218 | * conventions). A word may be an option, an argument to an |
219 | * option, or a non-option. An option begins with a special |
220 | * character, usually `%|-|%', although `%|+|%' is also used |
221 | * sometimes. As special exceptions, the word containing only a |
222 | * `%|-|%' is considered to be a non-option, since it usually |
223 | * represents standard input or output as a filename, and the |
224 | * word containing a double-dash `%|--|%' is used to mark all |
225 | * following words as being non-options regardless of their |
226 | * initial character. |
227 | * |
228 | * Traditionally, all words after the first non-option have been |
229 | * considered to be non-options automatically, so that options |
230 | * must be specified before filenames. However, this |
231 | * implementation can extract all the options from the command |
232 | * line regardless of their position. This can usually be |
233 | * disabled by setting one of the environment variables |
234 | * `%|POSIXLY_CORRECT|%' or `%|_POSIX_OPTION_ORDER|%'. |
235 | * |
236 | * There are two different styles of options: `short' and |
237 | * `long'. |
238 | * |
239 | * Short options are the sort which Unix has known for ages: an |
240 | * option is a single letter, preceded by a `%|-|%'. Short |
241 | * options can be joined together to save space (and possibly to |
242 | * make silly words): e.g., instead of giving options |
243 | * `%|-x -y|%', a user could write `%|-xy|%'. Some short |
244 | * options can have arguments, which appear after the option |
245 | * letter, either immediately following, or in the next `word' |
246 | * (so an option with an argument could be written as |
247 | * `%|-o foo|%' or as `%|-ofoo|%'). Note that options with |
248 | * optional arguments must be written in the second style. |
249 | * |
250 | * When a short option controls a flag setting, it is sometimes |
251 | * possible to explicitly turn the flag off, as well as turning |
252 | * it on, (usually to override default options). This is |
253 | * usually done by using a `%|+|%' instead of a `%|-|%' to |
254 | * introduce the option. |
255 | * |
256 | * Long options, as popularised by the GNU utilities, are given |
257 | * long-ish memorable names, preceded by a double-dash `%|--|%'. |
258 | * Since their names are more than a single character, long |
259 | * options can't be combined in the same way as short options. |
260 | * Arguments to long options may be given either in the same |
261 | * `word', separated from the option name by an equals sign, or |
262 | * in the following `word'. |
263 | * |
264 | * Long option names can be abbreviated if necessary, as long |
265 | * as the abbreviation is unique. This means that options can |
266 | * have sensible and memorable names but still not require much |
267 | * typing from an experienced user. |
268 | * |
269 | * Like short options, long options can control flag settings. |
270 | * The options to manipulate these settings come in pairs: an |
271 | * option of the form `%|--set-flag|%' might set the flag, while |
272 | * an option of the form `%|--no-set-flag|%' might clear it. |
273 | * |
274 | * It is usual for applications to provide both short and long |
275 | * options with identical behaviour. Some applications with |
276 | * lots of options may only provide long options (although they |
277 | * will often be only two or three characters long). In this |
278 | * case, long options can be preceded with a single `%|-|%' |
279 | * character, and negated by a `%|+|%' character. |
280 | * |
281 | * Finally, some (older) programs accept arguments of the form |
282 | * `%%@.{"-"<number>}%%', to set some numerical parameter, |
283 | * typically a line count of some kind. |
284 | * |
285 | * |
286 | * How programs parse options |
287 | * |
288 | * An application parses its options by calling mdwopt |
289 | * repeatedly. Each time it is called, mdwopt returns a value |
290 | * describing the option just read, and stores information about |
291 | * the option in a data block. The value %$-1$% is returned |
292 | * when there are no more options to be read. The `%|?|%' |
293 | * character is returned when an error is encountered. |
294 | * |
295 | * Before starting to parse options, the value @data->ind@ must |
296 | * be set to 0 or 1. The value of @data->err@ can also be set, |
297 | * to choose whether errors are reported by mdwopt. |
298 | * |
299 | * The program's `@argc@' and `@argv@' arguments are passed to |
300 | * the options parser, so that it can read the command line. A |
301 | * flags word is also passed, allowing the program fine control |
302 | * over parsing. The flags are described above. |
303 | * |
304 | * Short options are described by a string, which once upon a |
305 | * time just contained the permitted option characters. Now the |
306 | * options string begins with a collection of flag characters, |
307 | * and various flag characters can be put after options |
308 | * characters to change their properties. |
309 | * |
310 | * If the first character of the short options string is |
311 | * `%|+|%', `%|-|%' or `%|!|%', the order in which options are |
312 | * read is modified, as follows: |
313 | * |
314 | * `%|+|%' forces the POSIX order to be used. As soon as a non- |
315 | * option is found, mdwopt returns %$-1$%. |
316 | * |
317 | * `%|-|%' makes mdwopt treat non-options as being `special' |
318 | * sorts of option. When a non-option word is found, the |
319 | * value 0 is returned, and the actual text of the word |
320 | * is stored as being the option's argument. |
321 | * |
322 | * `%|!|%' forces the default order to be used. The entire |
323 | * command line is scanned for options, which are |
324 | * returned in order. However, during this process, |
325 | * the options are moved in the @argv@ array, so that |
326 | * they appear before the non- options. |
327 | * |
328 | * A `%|:|%' character may be placed after the ordering flag (or |
329 | * at the very beginning if no ordering flag is given) which |
330 | * indicates that the character `%|:|%', rather than `%|?|%', |
331 | * should be returned if a missing argument error is detected. |
332 | * |
333 | * Each option in the string can be followed by a `%|+|%' sign, |
334 | * indicating that it can be negated, a `%|:|%' sign indicating |
335 | * that it requires an argument, or a `%|::|%' string, |
336 | * indicating an optional argument. Both `%|+|%' and `%|:|%' or |
337 | * `%|::|%' may be given, although the `%|+|%' must come first. |
338 | * |
339 | * If an option is found, the option character is returned to |
340 | * the caller. A pointer to an argument is stored in |
341 | * @data->arg@, or @NULL@ is stored if there was no argument. |
342 | * If a negated option was found, the option character is |
343 | * returned ORred with @gFlag_negated@ (bit 8 set). |
344 | * |
345 | * Long options are described in a table. Each entry in the |
346 | * table is of type @struct option@, and the table is terminated |
347 | * by an entry whose @name@ field is null. Each option has |
348 | * a flags word which, due to historical reasons, is called |
349 | * @has_arg@. This describes various properties of the option, |
350 | * such as what sort of argument it takes, and whether it can |
351 | * be negated. |
352 | * |
353 | * When mdwopt finds a long option, it looks the name up in the |
354 | * table. The index of the matching entry is stored in the |
355 | * @longind@ variable, passed to mdwopt (unless @longind@ is 0): |
356 | * a value of %$-1$% indicates that no long option was |
357 | * found. The behaviour is then dependent on the values in the |
358 | * table entry. If @flag@ is nonzero, it points to an integer |
359 | * to be modified by mdwopt. Usually the value in the @val@ |
360 | * field is simply stored in the @flag@ variable. If the flag |
361 | * @gFlag_switch@ is set, however, the value is combined with |
362 | * the existing value of the flags using a bitwise OR. If |
363 | * @gFlag_negate@ is set, then the flag bit will be cleared if a |
364 | * matching negated long option is found. The value 0 is |
365 | * returned. |
366 | * |
367 | * If @flag@ is zero, the value in @val@ is returned by mdwopt, |
368 | * possibly with bit 8 set if the option was negated. |
369 | * |
370 | * Arguments for long options are stored in @data->arg@, as |
371 | * before. |
372 | * |
373 | * Numeric options, if enabled, cause the value `%|#|%' to be |
374 | * returned, and the numeric value to be stored in @data->opt@. |
375 | * |
376 | * If the flag @gFlag_envVar@ is set on entry, options will be |
377 | * extracted from an environment variable whose name is built by |
378 | * capitalising all the letters of the program's name. (This |
379 | * allows a user to have different default settings for a |
380 | * program, by calling it through different symbolic links.) */ |
381 | |
382 | int mdwopt(int argc, char *const *argv, |
383 | const char *shortopt, |
384 | const struct option *longopts, int *longind, |
385 | mdwopt_data *data, int flags) |
386 | { |
387 | /* --- Local variables --- */ |
388 | |
389 | char *p, *q, *r; /* Some useful things to have */ |
390 | char *prefix; /* Prefix from this option */ |
391 | int i; /* Always useful */ |
392 | char noarg = '?'; /* Standard missing-arg char */ |
393 | |
394 | /* --- Sort out our data --- */ |
395 | |
396 | if (!data) /* If default data requested */ |
397 | data = &mdwopt_global; /* Then use the global stuff */ |
398 | |
399 | /* --- See if this is the first time --- */ |
400 | |
401 | if (data->ind == 0 || (data->ind == 1 && ~flags & gFlag_noProgName)) { |
402 | |
403 | /* --- Sort out default returning order --- */ |
404 | |
405 | if (getenv("_POSIX_OPTION_ORDER") || /* Examine environment for opts */ |
406 | getenv("POSIXLY_CORRECT")) /* To see if we disable features */ |
407 | data->order = ord__posix; /* If set, use POSIX ordering */ |
408 | else |
409 | data->order = ord__permute; /* Otherwise mangle the options */ |
410 | |
411 | /* --- Now see what the caller actually wants --- */ |
412 | |
413 | switch (shortopt[0]) { /* Look at the first character */ |
414 | case '-': /* `%|-|%' turns on in-orderness */ |
415 | data->order = ord__return; |
416 | break; |
417 | case '+': /* `%|+|%' turns on POSIXness */ |
418 | data->order = ord__posix; |
419 | break; |
420 | case '!': /* `%|!|%' ignores POSIXness */ |
421 | data->order = ord__permute; |
422 | break; |
423 | } |
424 | |
425 | /* --- Now decide on the program's name --- */ |
426 | |
427 | if (~flags & gFlag_noProgName) { |
428 | p = q = (char *)argv[0]; |
429 | while (*p) { |
430 | if (*p++ == PATHSEP) |
431 | q = p; |
432 | } |
433 | data->prog = q; |
434 | |
435 | data->ind = data->next = 1; |
436 | data->list = 0; |
437 | |
438 | /* --- See about environment variables --- * |
439 | * |
440 | * Be careful. The program may be setuid, and an attacker might have |
441 | * given us a long name in @argv[0]@. If the name is very long, don't |
442 | * support this option. |
443 | */ |
444 | |
445 | if (flags & gFlag_envVar && strlen(data->prog) < 48) { |
446 | |
447 | char buf[64]; |
448 | |
449 | /* --- For RISC OS, support a different format --- * |
450 | * |
451 | * Acorn's RISC OS tends to put settings in variables named |
452 | * `App$Options' rather than `APP'. Under RISC OS, I'll support |
453 | * both methods, just to avoid confuddlement. |
454 | */ |
455 | |
456 | #ifdef __riscos |
457 | sprintf(buf, "%s$Options", data->prog); |
458 | p = getenv(buf); |
459 | if (!p) { |
460 | #endif |
461 | |
462 | p = buf; /* Point to a buffer */ |
463 | q = data->prog; /* Point to program name */ |
464 | while (*q) /* While characters left here */ |
465 | *p++ = toupper(*q++); /* Copy and uppercase */ |
466 | *p++ = 0; /* Terminate my copy of this */ |
467 | p = getenv(buf); /* Get the value of the variable */ |
468 | |
469 | #ifdef __riscos |
470 | } |
471 | #endif |
472 | |
473 | /* --- Copy the options string into a buffer --- */ |
474 | |
475 | if (p) { /* If it is defined */ |
476 | q = malloc(strlen(p) + 1); /* Allocate space for a copy */ |
477 | if (!q) { /* If that failed */ |
478 | fprintf(stderr, /* Report a nice error */ |
479 | "%s: Not enough memory to read settings in " |
480 | "environment variable\n", |
481 | data->prog); |
482 | } else { /* Otherwise */ |
483 | strcpy(q, p); /* Copy the text over */ |
484 | data->ind = -1; /* Mark that we're parsing envvar */ |
485 | data->env = data->estart = q; /* And store the pointer away */ |
486 | } |
487 | } |
488 | |
489 | } |
490 | } |
491 | else |
492 | data->ind = data->next = 0; |
493 | } |
494 | |
495 | /* --- Do some initial bodgery --- * |
496 | * |
497 | * The @shortopt@ string can have some interesting characters at the |
498 | * beginning. We'll skip past them. |
499 | */ |
500 | |
501 | switch (shortopt[0]) { |
502 | case '+': |
503 | case '-': |
504 | case '!': |
505 | shortopt++; |
506 | break; |
507 | } |
508 | |
509 | if (shortopt[0] == ':') { |
510 | noarg = shortopt[0]; |
511 | shortopt++; |
512 | } |
513 | |
514 | if (longind) /* Allow longind to be null */ |
515 | *longind = -1; /* Clear this to avoid confusion */ |
516 | data->opt = -1; /* And this too */ |
517 | data->arg = 0; /* No option set up here */ |
518 | |
519 | /* --- Now go off and search for an option --- */ |
520 | |
521 | if (!data->list || !*data->list) { |
522 | data->order &= 3; /* Clear negation flag */ |
523 | |
524 | /* --- Now we need to find the next option --- * |
525 | * |
526 | * Exactly how we do this depends on the settings of the order variable. |
527 | * We identify options as being things starting with `%|-|%', and which |
528 | * aren't equal to `%|-|%' or `%|--|%'. We'll look for options until: |
529 | * |
530 | * * We find something which isn't an option AND @order == ord__posix@ |
531 | * * We find a `%|--|%' |
532 | * * We reach the end of the list |
533 | * |
534 | * There are some added little wrinkles, which we'll meet as we go. |
535 | */ |
536 | |
537 | for (;;) { /* Keep looping for a while */ |
538 | p = mo__nextWord(argc, argv, data); /* Get the next word out */ |
539 | if (!p) /* If there's no next word */ |
540 | return (EOF); /* There's no more now */ |
541 | |
542 | /* --- See if we've found an option --- */ |
543 | |
544 | if ((p[0] == '-' || (p[0] == '+' && flags & gFlag_negation)) && |
545 | p[1] != 0) { |
546 | if (strcmp(p, "--") == 0) { /* If this is the magic marker */ |
547 | mo__permute(argv, data); /* Stow the magic marker item */ |
548 | return (EOF); /* There's nothing else to do */ |
549 | } |
550 | break; /* We've found something! */ |
551 | } |
552 | |
553 | /* --- Figure out how to proceed --- */ |
554 | |
555 | switch (data->order & 3) { |
556 | case ord__posix: /* POSIX option order */ |
557 | return (EOF); /* This is easy */ |
558 | break; |
559 | case ord__permute: /* Permute the option order */ |
560 | break; |
561 | case ord__return: /* Return each argument */ |
562 | mo__permute(argv, data); /* Insert word in same place */ |
563 | data->arg = p; /* Point to the argument */ |
564 | return (0); /* Return the value */ |
565 | } |
566 | } |
567 | |
568 | /* --- We found an option --- */ |
569 | |
570 | mo__permute(argv, data); /* Do any permuting necessary */ |
571 | |
572 | /* --- Check for a numeric option --- * |
573 | * |
574 | * We only check the first character (or the second if the first is a |
575 | * sign). This ought to be enough. |
576 | */ |
577 | |
578 | if (flags & gFlag_numbers && (p[0] == '-' || flags & gFlag_negNumber)) { |
579 | if (((p[1] == '+' || p[1] == '-') && isdigit((unsigned char)p[2])) || |
580 | isdigit((unsigned char)p[1])) { |
581 | data->opt = strtol(p + 1, &data->arg, 10); |
582 | while (isspace((unsigned char)data->arg[0])) |
583 | data->arg++; |
584 | if (!data->arg[0]) |
585 | data->arg = 0; |
586 | return (p[0] == '-' ? '#' : '#' | gFlag_negated); |
587 | } |
588 | } |
589 | |
590 | /* --- Check for a long option --- */ |
591 | |
592 | if (p[0] == '+') |
593 | data->order |= ord__negate; |
594 | |
595 | if (((p[0] == '-' && p[1] == '-') || |
596 | (flags & gFlag_noShorts && !mo__findOpt(p[1], shortopt, data))) && |
597 | (~flags & gFlag_noLongs)) /* Is this a long option? */ |
598 | { |
599 | int match = -1; /* Count matches as we go */ |
600 | |
601 | if (p[0] == '+') { /* If it's negated */ |
602 | data->order |= ord__negate; /* Set the negate flag */ |
603 | p++; /* Point to the main text */ |
604 | prefix = "+"; /* Set the prefix string up */ |
605 | } else if (p[1] == '-') { /* If this is a `%|--|%' option */ |
606 | if ((flags & gFlag_negation) && strncmp(p + 2, "no-", 3) == 0) { |
607 | p += 5; /* Point to main text */ |
608 | prefix = "--no-"; /* And set the prefix */ |
609 | data->order |= ord__negate; /* Set the negatedness flag */ |
610 | } else { |
611 | p += 2; /* Point to the main text */ |
612 | prefix = "--"; /* Remember the prefix string */ |
613 | } |
614 | } else { |
615 | if ((flags & gFlag_negation) && strncmp(p + 1, "no-", 3) == 0) { |
616 | p += 4; /* Find the text */ |
617 | prefix = "-no-"; /* Set the prefix */ |
618 | data->order |= ord__negate; /* Set negatedness flag */ |
619 | } else { |
620 | p++; /* Otherwise find the text */ |
621 | prefix = "-"; /* And remember the prefix */ |
622 | } |
623 | } |
624 | |
625 | for (i = 0; longopts[i].name; i++) { /* Loop through the options */ |
626 | if ((data->order & ord__negate) && |
627 | (~longopts[i].has_arg & gFlag_negate)) |
628 | continue; /* If neg and opt doesn't allow */ |
629 | |
630 | r = (char *) longopts[i].name; /* Point to the name string */ |
631 | q = p; /* Point to the string start */ |
632 | for (;;) { /* Do a loop here */ |
633 | if (*q == 0 || *q == '=') { /* End of the option string? */ |
634 | if (*r == 0) { /* If end of other string */ |
635 | match = i; /* This is the match */ |
636 | goto botched; /* And exit the loop now */ |
637 | } |
638 | if (match == -1) { /* If no match currently */ |
639 | match = i; /* Then this is it, here */ |
640 | break; /* Stop looking now */ |
641 | } else { |
642 | match = -1; /* Else it's ambiguous */ |
643 | goto botched; /* So give up right now */ |
644 | } |
645 | } |
646 | else if (*q != *r) /* Otherwise if mismatch */ |
647 | break; /* Abort this loop */ |
648 | q++, r++; /* Increment the counters */ |
649 | } |
650 | } |
651 | |
652 | botched: |
653 | if (match == -1) { /* If we couldn't find a match */ |
654 | if (data->err) { |
655 | fprintf(stderr, "%s: unrecognised option `%s%s'\n", |
656 | data->prog, |
657 | prefix, p); |
658 | } |
659 | return ('?'); |
660 | } |
661 | |
662 | if (longind) /* Allow longind to be null */ |
663 | *longind = match; /* Store the match away */ |
664 | |
665 | /* --- Handle argument behaviour --- */ |
666 | |
667 | while (*p != 0 && *p != '=') /* Find the argument string */ |
668 | p++; |
669 | p = (*p ? p + 1 : 0); /* Sort out argument presence */ |
670 | q = (char *) longopts[match].name; /* Remember the name here */ |
671 | |
672 | switch (longopts[match].has_arg & 3) { |
673 | case no_argument: |
674 | if (p) { |
675 | if (data->err) { |
676 | fprintf(stderr, |
677 | "%s: option `%s%s' does not accept arguments\n", |
678 | data->prog, |
679 | prefix, q); |
680 | } |
681 | return ('?'); |
682 | } |
683 | break; |
684 | |
685 | case required_argument: |
686 | if (!p) { /* If no argument given */ |
687 | p = mo__nextWord(argc, argv, data); |
688 | |
689 | if (!p) { /* If no more arguments */ |
690 | if (data->err) { |
691 | fprintf(stderr, "%s: option `%s%s' requires an argument\n", |
692 | data->prog, |
693 | prefix, q); |
694 | } |
695 | return (noarg); |
696 | } |
697 | |
698 | mo__permute(argv, data); |
699 | } |
700 | break; |
701 | |
702 | case optional_argument: |
703 | /* Who cares? */ |
704 | break; |
705 | } |
706 | data->arg = p; |
707 | |
708 | /* --- Do correct things now we have a match --- */ |
709 | |
710 | if (longopts[match].flag) { /* If he has a @flag@ argument */ |
711 | if (longopts[match].has_arg & gFlag_switch) { |
712 | if (data->order & ord__negate) |
713 | *longopts[match].flag &= ~longopts[match].val; |
714 | else |
715 | *longopts[match].flag |= longopts[match].val; |
716 | } else { |
717 | if (data->order & ord__negate) |
718 | *longopts[match].flag = 0; |
719 | else |
720 | *longopts[match].flag = longopts[match].val; |
721 | } |
722 | return (0); /* And return something */ |
723 | } else { |
724 | if (data->order & ord__negate) |
725 | return (longopts[match].val | gFlag_negated); |
726 | else |
727 | return (longopts[match].val); |
728 | } |
729 | } |
730 | |
731 | /* --- Do short options things --- */ |
732 | |
733 | else { |
734 | if (p[0] == '+') /* If starts with a `%|+|%' */ |
735 | data->order |= ord__negate; |
736 | data->list = p + 1; /* Omit leading `%|-|%'/`%|+|%' */ |
737 | } |
738 | } |
739 | |
740 | /* --- Now process the short options --- */ |
741 | |
742 | i = *data->list++; /* Get the next option letter */ |
743 | data->opt = i; /* Store this away nicely */ |
744 | |
745 | p = (char *) mo__findOpt(i, shortopt, data); |
746 | if (!p) { /* No more options left */ |
747 | if (data->err) { |
748 | fprintf(stderr, "%s: unknown option `%c%c'\n", |
749 | data->prog, |
750 | data->order & ord__negate ? '+' : '-', |
751 | i); |
752 | } |
753 | return ('?'); |
754 | } |
755 | |
756 | data->opt = i; /* Store this for the caller */ |
757 | |
758 | /* --- Sort out an argument, if we expect one --- */ |
759 | |
760 | if (p[0] == ':') { /* If we expect an option */ |
761 | q = (data->list[0] ? data->list : 0); /* If argument expected, use it */ |
762 | data->list = 0; /* Kill the remaining options */ |
763 | if (p[1] != ':' && !q) { /* If no arg, and not optional */ |
764 | |
765 | /* --- Same code as before --- */ |
766 | |
767 | q = mo__nextWord(argc, argv, data); /* Read the next word */ |
768 | if (!q) { /* If no more arguments */ |
769 | if (data->err) { |
770 | fprintf(stderr, "%s: option `%c%c' requires an argument\n", |
771 | data->prog, |
772 | data->order & ord__negate ? '+' : '-', |
773 | i); |
774 | } |
775 | return (noarg); |
776 | } |
777 | mo__permute(argv, data); |
778 | } |
779 | |
780 | data->arg = q; |
781 | } |
782 | return ((data->order & ord__negate) ? i | gFlag_negated : i); |
783 | } |
784 | |
785 | /*----- That's all, folks -------------------------------------------------*/ |