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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: mdwopt.c,v 1.2 1999/05/13 22:57:23 mdw Exp $ |
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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 $ |
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32 | * Revision 1.2 1999/05/13 22:57:23 mdw |
33 | * Change `-ise' to `-ize' throughout. |
34 | * |
35 | * Revision 1.1.1.1 1999/05/05 19:23:47 mdw |
36 | * New import. The old CVS repository was lost in a disk disaster. |
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37 | * |
38 | * --- Previous lives --- |
39 | * |
40 | * %Log: mdwopt.c,v % |
41 | * Revision 1.7 1997/09/11 09:19:11 mdw |
42 | * (mo__nextWord): Arrrgh. Don't free the environment variable buffer! |
43 | * People are still using it! |
44 | * |
45 | * Revision 1.6 1997/09/11 09:05:54 mdw |
46 | * (mo__nextWord): Fix bug which returns too many words from environment |
47 | * variables. |
48 | * |
49 | * Revision 1.5 1997/08/09 20:27:59 mdw |
50 | * Fix spelling of `Licensing'. |
51 | * |
52 | * Revision 1.4 1997/07/29 21:11:35 mdw |
53 | * Reformatted. Fixed buffer overflow when dealing with environment |
54 | * variables. Included NT in list of daft operating systems with `\' as a |
55 | * path separator. Fixed address of the FSF. |
56 | * |
57 | * Revision 1.3 1997/02/26 00:41:10 mdw |
58 | * Added GPL notice to the top. Slight formatting changes. |
59 | * |
60 | * Revision 1.2 1996/10/28 13:12:13 mdw |
61 | * Fixed calls to ctype.h routines. Arguments are cast to unsigned char |
62 | * to avoid invoking undefined behaviour caused by signedness of chars. |
63 | * |
64 | * Revision 1.1 1996/09/24 18:01:28 mdw |
65 | * Initial revision |
66 | * |
67 | */ |
68 | |
69 | /*----- External dependencies ---------------------------------------------*/ |
70 | |
71 | #include <ctype.h> |
72 | #include <stdio.h> |
73 | #include <stdlib.h> |
74 | #include <string.h> |
75 | |
76 | #include "mdwopt.h" |
77 | |
78 | /*----- Configuration things ----------------------------------------------*/ |
79 | |
80 | #if defined(__riscos) |
81 | # define PATHSEP '.' |
82 | #elif defined(__OS2__) || defined(__MSDOS__) || defined(__WINNT__) |
83 | # define PATHSEP '\\' |
84 | #else /* Assume a sane filing system */ |
85 | # define PATHSEP '/' |
86 | #endif |
87 | |
88 | /*----- Global variables --------------------------------------------------*/ |
89 | |
90 | mdwopt_data mdwopt_global = {0, 0, 0, 1, 0, 0, 0, 0, 0}; |
91 | |
92 | enum { |
93 | ord__permute = 0, /* Permute the options (default) */ |
94 | ord__return = 1, /* Return non-option things */ |
95 | ord__posix = 2, /* Do POSIX-type hacking */ |
96 | ord__negate = 4 /* Magic negate-next-thing flag */ |
97 | }; |
98 | |
99 | /*----- Main code ---------------------------------------------------------*/ |
100 | |
101 | /* --- @mo__nextWord@ --- * |
102 | * |
103 | * Arguments: @int argc@ = number of command line options |
104 | * @char *argv[]@ = pointer to command line options |
105 | * @mdwopt_data *data@ = pointer to persistent state |
106 | * |
107 | * Returns: Pointer to the next word to handle, or 0 |
108 | * |
109 | * Use: Extracts the next word from the command line or environment |
110 | * variable. |
111 | */ |
112 | |
113 | static char *mo__nextWord(int argc, char *const *argv, mdwopt_data *data) |
114 | { |
115 | if (data->ind == -1) { |
116 | char *p = data->env; |
117 | char *q; |
118 | while (isspace((unsigned char)*p)) |
119 | p++; |
120 | q = p; |
121 | while (*p && !isspace((unsigned char)*p)) |
122 | p++; |
123 | data->env = p; |
124 | if (*p) |
125 | *p++ = 0; |
126 | if (p != q) |
127 | return (q); |
128 | data->env = 0; |
129 | data->ind = 1; |
130 | } |
131 | |
132 | if (data->next == argc) |
133 | return (0); |
134 | return (argv[data->next++]); |
135 | } |
136 | |
137 | /* --- @mo__permute@ --- * |
138 | * |
139 | * Arguments: @char *argv[]@ = pointer to command line arguments |
140 | * @mdwopt_data *data@ = pointer to persistent data |
141 | * |
142 | * Returns: -- |
143 | * |
144 | * Use: Moves a command line option into the right place. |
145 | */ |
146 | |
147 | static void mo__permute(char *const *argv, mdwopt_data *data) |
148 | { |
149 | char **v = (char **)argv; |
150 | if (data->ind != -1) { |
151 | int i = data->next - 1; |
152 | char *p = v[i]; |
153 | while (i > data->ind) { |
154 | v[i] = v[i - 1]; |
155 | i--; |
156 | } |
157 | v[i] = p; |
158 | data->ind++; |
159 | } |
160 | } |
161 | |
162 | /* --- @mo__findOpt@ --- * |
163 | * |
164 | * Arguments: @int o@ = which option to search for |
165 | * @const char *shortopt@ = short options string to search |
166 | * @mdwopt_data *data@ = pointer to persistant state |
167 | * |
168 | * Returns: Pointer to rest of short options string (including magic |
169 | * characters) |
170 | * |
171 | * Use: Looks up a short option in the given string. |
172 | */ |
173 | |
174 | static const char *mo__findOpt(int o, const char *shortopt, |
175 | mdwopt_data *data) |
176 | { |
177 | const char *p = shortopt; /* Point to short opts table */ |
178 | for (;;) { |
179 | if (!*p) /* No more options left */ |
180 | return (0); |
181 | |
182 | if (o != *p || (p[1] != '+' && data->order & ord__negate)) { |
183 | p++; /* Skip this option entry */ |
184 | while (*p == '+') /* Jump a `%|+|%' sign */ |
185 | p++; |
186 | while (*p == ':') /* And jump any `%|:|%' characters */ |
187 | p++; /* Just in case there are any */ |
188 | } |
189 | else |
190 | return (p + 1); |
191 | } |
192 | } |
193 | |
194 | /* --- @mdwopt@ --- * |
195 | * |
196 | * Arguments: @int argc@ = number of command line arguments |
197 | * @char * const *argv@ = pointer to command line arguments |
198 | * @const char *shortopt@ = pointer to short options information |
199 | * @const struct option *longopts@ = pointer to long opts info |
200 | * @int *longind@ = where to store matched longopt |
201 | * @mdwopt_data *data@ = persistent state for the parser |
202 | * @int flags@ = various useful flags |
203 | * |
204 | * Returns: Value of option found next, or an error character, or |
205 | * @EOF@ for the last thing. |
206 | * |
207 | * Use: Reads options. The routine should be more-or-less compatible |
208 | * with standard getopts, although it provides many more |
209 | * features even than the standard GNU implementation. |
210 | * |
211 | * The precise manner of options parsing is determined by |
212 | * various flag settings, which are described below. By setting |
213 | * flag values appropriately, you can achieve behaviour very |
214 | * similar to most other getopt routines. |
215 | * |
216 | * |
217 | * How options parsing appears to users |
218 | * |
219 | * A command line consists of a number of `words' (which may |
220 | * contain spaces, according to various shell quoting |
221 | * conventions). A word may be an option, an argument to an |
222 | * option, or a non-option. An option begins with a special |
223 | * character, usually `%|-|%', although `%|+|%' is also used |
224 | * sometimes. As special exceptions, the word containing only a |
225 | * `%|-|%' is considered to be a non-option, since it usually |
226 | * represents standard input or output as a filename, and the |
227 | * word containing a double-dash `%|--|%' is used to mark all |
228 | * following words as being non-options regardless of their |
229 | * initial character. |
230 | * |
231 | * Traditionally, all words after the first non-option have been |
232 | * considered to be non-options automatically, so that options |
233 | * must be specified before filenames. However, this |
234 | * implementation can extract all the options from the command |
235 | * line regardless of their position. This can usually be |
236 | * disabled by setting one of the environment variables |
237 | * `%|POSIXLY_CORRECT|%' or `%|_POSIX_OPTION_ORDER|%'. |
238 | * |
239 | * There are two different styles of options: `short' and |
240 | * `long'. |
241 | * |
242 | * Short options are the sort which Unix has known for ages: an |
243 | * option is a single letter, preceded by a `%|-|%'. Short |
244 | * options can be joined together to save space (and possibly to |
245 | * make silly words): e.g., instead of giving options |
246 | * `%|-x -y|%', a user could write `%|-xy|%'. Some short |
247 | * options can have arguments, which appear after the option |
248 | * letter, either immediately following, or in the next `word' |
249 | * (so an option with an argument could be written as |
250 | * `%|-o foo|%' or as `%|-ofoo|%'). Note that options with |
251 | * optional arguments must be written in the second style. |
252 | * |
253 | * When a short option controls a flag setting, it is sometimes |
254 | * possible to explicitly turn the flag off, as well as turning |
255 | * it on, (usually to override default options). This is |
256 | * usually done by using a `%|+|%' instead of a `%|-|%' to |
257 | * introduce the option. |
258 | * |
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259 | * Long options, as popularized by the GNU utilities, are given |
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260 | * long-ish memorable names, preceded by a double-dash `%|--|%'. |
261 | * Since their names are more than a single character, long |
262 | * options can't be combined in the same way as short options. |
263 | * Arguments to long options may be given either in the same |
264 | * `word', separated from the option name by an equals sign, or |
265 | * in the following `word'. |
266 | * |
267 | * Long option names can be abbreviated if necessary, as long |
268 | * as the abbreviation is unique. This means that options can |
269 | * have sensible and memorable names but still not require much |
270 | * typing from an experienced user. |
271 | * |
272 | * Like short options, long options can control flag settings. |
273 | * The options to manipulate these settings come in pairs: an |
274 | * option of the form `%|--set-flag|%' might set the flag, while |
275 | * an option of the form `%|--no-set-flag|%' might clear it. |
276 | * |
277 | * It is usual for applications to provide both short and long |
278 | * options with identical behaviour. Some applications with |
279 | * lots of options may only provide long options (although they |
280 | * will often be only two or three characters long). In this |
281 | * case, long options can be preceded with a single `%|-|%' |
282 | * character, and negated by a `%|+|%' character. |
283 | * |
284 | * Finally, some (older) programs accept arguments of the form |
285 | * `%%@.{"-"<number>}%%', to set some numerical parameter, |
286 | * typically a line count of some kind. |
287 | * |
288 | * |
289 | * How programs parse options |
290 | * |
291 | * An application parses its options by calling mdwopt |
292 | * repeatedly. Each time it is called, mdwopt returns a value |
293 | * describing the option just read, and stores information about |
294 | * the option in a data block. The value %$-1$% is returned |
295 | * when there are no more options to be read. The `%|?|%' |
296 | * character is returned when an error is encountered. |
297 | * |
298 | * Before starting to parse options, the value @data->ind@ must |
299 | * be set to 0 or 1. The value of @data->err@ can also be set, |
300 | * to choose whether errors are reported by mdwopt. |
301 | * |
302 | * The program's `@argc@' and `@argv@' arguments are passed to |
303 | * the options parser, so that it can read the command line. A |
304 | * flags word is also passed, allowing the program fine control |
305 | * over parsing. The flags are described above. |
306 | * |
307 | * Short options are described by a string, which once upon a |
308 | * time just contained the permitted option characters. Now the |
309 | * options string begins with a collection of flag characters, |
310 | * and various flag characters can be put after options |
311 | * characters to change their properties. |
312 | * |
313 | * If the first character of the short options string is |
314 | * `%|+|%', `%|-|%' or `%|!|%', the order in which options are |
315 | * read is modified, as follows: |
316 | * |
317 | * `%|+|%' forces the POSIX order to be used. As soon as a non- |
318 | * option is found, mdwopt returns %$-1$%. |
319 | * |
320 | * `%|-|%' makes mdwopt treat non-options as being `special' |
321 | * sorts of option. When a non-option word is found, the |
322 | * value 0 is returned, and the actual text of the word |
323 | * is stored as being the option's argument. |
324 | * |
325 | * `%|!|%' forces the default order to be used. The entire |
326 | * command line is scanned for options, which are |
327 | * returned in order. However, during this process, |
328 | * the options are moved in the @argv@ array, so that |
329 | * they appear before the non- options. |
330 | * |
331 | * A `%|:|%' character may be placed after the ordering flag (or |
332 | * at the very beginning if no ordering flag is given) which |
333 | * indicates that the character `%|:|%', rather than `%|?|%', |
334 | * should be returned if a missing argument error is detected. |
335 | * |
336 | * Each option in the string can be followed by a `%|+|%' sign, |
337 | * indicating that it can be negated, a `%|:|%' sign indicating |
338 | * that it requires an argument, or a `%|::|%' string, |
339 | * indicating an optional argument. Both `%|+|%' and `%|:|%' or |
340 | * `%|::|%' may be given, although the `%|+|%' must come first. |
341 | * |
342 | * If an option is found, the option character is returned to |
343 | * the caller. A pointer to an argument is stored in |
344 | * @data->arg@, or @NULL@ is stored if there was no argument. |
345 | * If a negated option was found, the option character is |
346 | * returned ORred with @gFlag_negated@ (bit 8 set). |
347 | * |
348 | * Long options are described in a table. Each entry in the |
349 | * table is of type @struct option@, and the table is terminated |
350 | * by an entry whose @name@ field is null. Each option has |
351 | * a flags word which, due to historical reasons, is called |
352 | * @has_arg@. This describes various properties of the option, |
353 | * such as what sort of argument it takes, and whether it can |
354 | * be negated. |
355 | * |
356 | * When mdwopt finds a long option, it looks the name up in the |
357 | * table. The index of the matching entry is stored in the |
358 | * @longind@ variable, passed to mdwopt (unless @longind@ is 0): |
359 | * a value of %$-1$% indicates that no long option was |
360 | * found. The behaviour is then dependent on the values in the |
361 | * table entry. If @flag@ is nonzero, it points to an integer |
362 | * to be modified by mdwopt. Usually the value in the @val@ |
363 | * field is simply stored in the @flag@ variable. If the flag |
364 | * @gFlag_switch@ is set, however, the value is combined with |
365 | * the existing value of the flags using a bitwise OR. If |
366 | * @gFlag_negate@ is set, then the flag bit will be cleared if a |
367 | * matching negated long option is found. The value 0 is |
368 | * returned. |
369 | * |
370 | * If @flag@ is zero, the value in @val@ is returned by mdwopt, |
371 | * possibly with bit 8 set if the option was negated. |
372 | * |
373 | * Arguments for long options are stored in @data->arg@, as |
374 | * before. |
375 | * |
376 | * Numeric options, if enabled, cause the value `%|#|%' to be |
377 | * returned, and the numeric value to be stored in @data->opt@. |
378 | * |
379 | * If the flag @gFlag_envVar@ is set on entry, options will be |
380 | * extracted from an environment variable whose name is built by |
381 | * capitalising all the letters of the program's name. (This |
382 | * allows a user to have different default settings for a |
383 | * program, by calling it through different symbolic links.) */ |
384 | |
385 | int mdwopt(int argc, char *const *argv, |
386 | const char *shortopt, |
387 | const struct option *longopts, int *longind, |
388 | mdwopt_data *data, int flags) |
389 | { |
390 | /* --- Local variables --- */ |
391 | |
392 | char *p, *q, *r; /* Some useful things to have */ |
393 | char *prefix; /* Prefix from this option */ |
394 | int i; /* Always useful */ |
395 | char noarg = '?'; /* Standard missing-arg char */ |
396 | |
397 | /* --- Sort out our data --- */ |
398 | |
399 | if (!data) /* If default data requested */ |
400 | data = &mdwopt_global; /* Then use the global stuff */ |
401 | |
402 | /* --- See if this is the first time --- */ |
403 | |
404 | if (data->ind == 0 || (data->ind == 1 && ~flags & gFlag_noProgName)) { |
405 | |
406 | /* --- Sort out default returning order --- */ |
407 | |
408 | if (getenv("_POSIX_OPTION_ORDER") || /* Examine environment for opts */ |
409 | getenv("POSIXLY_CORRECT")) /* To see if we disable features */ |
410 | data->order = ord__posix; /* If set, use POSIX ordering */ |
411 | else |
412 | data->order = ord__permute; /* Otherwise mangle the options */ |
413 | |
414 | /* --- Now see what the caller actually wants --- */ |
415 | |
416 | switch (shortopt[0]) { /* Look at the first character */ |
417 | case '-': /* `%|-|%' turns on in-orderness */ |
418 | data->order = ord__return; |
419 | break; |
420 | case '+': /* `%|+|%' turns on POSIXness */ |
421 | data->order = ord__posix; |
422 | break; |
423 | case '!': /* `%|!|%' ignores POSIXness */ |
424 | data->order = ord__permute; |
425 | break; |
426 | } |
427 | |
428 | /* --- Now decide on the program's name --- */ |
429 | |
430 | if (~flags & gFlag_noProgName) { |
431 | p = q = (char *)argv[0]; |
432 | while (*p) { |
433 | if (*p++ == PATHSEP) |
434 | q = p; |
435 | } |
436 | data->prog = q; |
437 | |
438 | data->ind = data->next = 1; |
439 | data->list = 0; |
440 | |
441 | /* --- See about environment variables --- * |
442 | * |
443 | * Be careful. The program may be setuid, and an attacker might have |
444 | * given us a long name in @argv[0]@. If the name is very long, don't |
445 | * support this option. |
446 | */ |
447 | |
448 | if (flags & gFlag_envVar && strlen(data->prog) < 48) { |
449 | |
450 | char buf[64]; |
451 | |
452 | /* --- For RISC OS, support a different format --- * |
453 | * |
454 | * Acorn's RISC OS tends to put settings in variables named |
455 | * `App$Options' rather than `APP'. Under RISC OS, I'll support |
456 | * both methods, just to avoid confuddlement. |
457 | */ |
458 | |
459 | #ifdef __riscos |
460 | sprintf(buf, "%s$Options", data->prog); |
461 | p = getenv(buf); |
462 | if (!p) { |
463 | #endif |
464 | |
465 | p = buf; /* Point to a buffer */ |
466 | q = data->prog; /* Point to program name */ |
467 | while (*q) /* While characters left here */ |
468 | *p++ = toupper(*q++); /* Copy and uppercase */ |
469 | *p++ = 0; /* Terminate my copy of this */ |
470 | p = getenv(buf); /* Get the value of the variable */ |
471 | |
472 | #ifdef __riscos |
473 | } |
474 | #endif |
475 | |
476 | /* --- Copy the options string into a buffer --- */ |
477 | |
478 | if (p) { /* If it is defined */ |
479 | q = malloc(strlen(p) + 1); /* Allocate space for a copy */ |
480 | if (!q) { /* If that failed */ |
481 | fprintf(stderr, /* Report a nice error */ |
482 | "%s: Not enough memory to read settings in " |
483 | "environment variable\n", |
484 | data->prog); |
485 | } else { /* Otherwise */ |
486 | strcpy(q, p); /* Copy the text over */ |
487 | data->ind = -1; /* Mark that we're parsing envvar */ |
488 | data->env = data->estart = q; /* And store the pointer away */ |
489 | } |
490 | } |
491 | |
492 | } |
493 | } |
494 | else |
495 | data->ind = data->next = 0; |
496 | } |
497 | |
498 | /* --- Do some initial bodgery --- * |
499 | * |
500 | * The @shortopt@ string can have some interesting characters at the |
501 | * beginning. We'll skip past them. |
502 | */ |
503 | |
504 | switch (shortopt[0]) { |
505 | case '+': |
506 | case '-': |
507 | case '!': |
508 | shortopt++; |
509 | break; |
510 | } |
511 | |
512 | if (shortopt[0] == ':') { |
513 | noarg = shortopt[0]; |
514 | shortopt++; |
515 | } |
516 | |
517 | if (longind) /* Allow longind to be null */ |
518 | *longind = -1; /* Clear this to avoid confusion */ |
519 | data->opt = -1; /* And this too */ |
520 | data->arg = 0; /* No option set up here */ |
521 | |
522 | /* --- Now go off and search for an option --- */ |
523 | |
524 | if (!data->list || !*data->list) { |
525 | data->order &= 3; /* Clear negation flag */ |
526 | |
527 | /* --- Now we need to find the next option --- * |
528 | * |
529 | * Exactly how we do this depends on the settings of the order variable. |
530 | * We identify options as being things starting with `%|-|%', and which |
531 | * aren't equal to `%|-|%' or `%|--|%'. We'll look for options until: |
532 | * |
533 | * * We find something which isn't an option AND @order == ord__posix@ |
534 | * * We find a `%|--|%' |
535 | * * We reach the end of the list |
536 | * |
537 | * There are some added little wrinkles, which we'll meet as we go. |
538 | */ |
539 | |
540 | for (;;) { /* Keep looping for a while */ |
541 | p = mo__nextWord(argc, argv, data); /* Get the next word out */ |
542 | if (!p) /* If there's no next word */ |
543 | return (EOF); /* There's no more now */ |
544 | |
545 | /* --- See if we've found an option --- */ |
546 | |
547 | if ((p[0] == '-' || (p[0] == '+' && flags & gFlag_negation)) && |
548 | p[1] != 0) { |
549 | if (strcmp(p, "--") == 0) { /* If this is the magic marker */ |
550 | mo__permute(argv, data); /* Stow the magic marker item */ |
551 | return (EOF); /* There's nothing else to do */ |
552 | } |
553 | break; /* We've found something! */ |
554 | } |
555 | |
556 | /* --- Figure out how to proceed --- */ |
557 | |
558 | switch (data->order & 3) { |
559 | case ord__posix: /* POSIX option order */ |
560 | return (EOF); /* This is easy */ |
561 | break; |
562 | case ord__permute: /* Permute the option order */ |
563 | break; |
564 | case ord__return: /* Return each argument */ |
565 | mo__permute(argv, data); /* Insert word in same place */ |
566 | data->arg = p; /* Point to the argument */ |
567 | return (0); /* Return the value */ |
568 | } |
569 | } |
570 | |
571 | /* --- We found an option --- */ |
572 | |
573 | mo__permute(argv, data); /* Do any permuting necessary */ |
574 | |
575 | /* --- Check for a numeric option --- * |
576 | * |
577 | * We only check the first character (or the second if the first is a |
578 | * sign). This ought to be enough. |
579 | */ |
580 | |
581 | if (flags & gFlag_numbers && (p[0] == '-' || flags & gFlag_negNumber)) { |
582 | if (((p[1] == '+' || p[1] == '-') && isdigit((unsigned char)p[2])) || |
583 | isdigit((unsigned char)p[1])) { |
584 | data->opt = strtol(p + 1, &data->arg, 10); |
585 | while (isspace((unsigned char)data->arg[0])) |
586 | data->arg++; |
587 | if (!data->arg[0]) |
588 | data->arg = 0; |
589 | return (p[0] == '-' ? '#' : '#' | gFlag_negated); |
590 | } |
591 | } |
592 | |
593 | /* --- Check for a long option --- */ |
594 | |
595 | if (p[0] == '+') |
596 | data->order |= ord__negate; |
597 | |
598 | if (((p[0] == '-' && p[1] == '-') || |
599 | (flags & gFlag_noShorts && !mo__findOpt(p[1], shortopt, data))) && |
600 | (~flags & gFlag_noLongs)) /* Is this a long option? */ |
601 | { |
602 | int match = -1; /* Count matches as we go */ |
603 | |
604 | if (p[0] == '+') { /* If it's negated */ |
605 | data->order |= ord__negate; /* Set the negate flag */ |
606 | p++; /* Point to the main text */ |
607 | prefix = "+"; /* Set the prefix string up */ |
608 | } else if (p[1] == '-') { /* If this is a `%|--|%' option */ |
609 | if ((flags & gFlag_negation) && strncmp(p + 2, "no-", 3) == 0) { |
610 | p += 5; /* Point to main text */ |
611 | prefix = "--no-"; /* And set the prefix */ |
612 | data->order |= ord__negate; /* Set the negatedness flag */ |
613 | } else { |
614 | p += 2; /* Point to the main text */ |
615 | prefix = "--"; /* Remember the prefix string */ |
616 | } |
617 | } else { |
618 | if ((flags & gFlag_negation) && strncmp(p + 1, "no-", 3) == 0) { |
619 | p += 4; /* Find the text */ |
620 | prefix = "-no-"; /* Set the prefix */ |
621 | data->order |= ord__negate; /* Set negatedness flag */ |
622 | } else { |
623 | p++; /* Otherwise find the text */ |
624 | prefix = "-"; /* And remember the prefix */ |
625 | } |
626 | } |
627 | |
628 | for (i = 0; longopts[i].name; i++) { /* Loop through the options */ |
629 | if ((data->order & ord__negate) && |
630 | (~longopts[i].has_arg & gFlag_negate)) |
631 | continue; /* If neg and opt doesn't allow */ |
632 | |
633 | r = (char *) longopts[i].name; /* Point to the name string */ |
634 | q = p; /* Point to the string start */ |
635 | for (;;) { /* Do a loop here */ |
636 | if (*q == 0 || *q == '=') { /* End of the option string? */ |
637 | if (*r == 0) { /* If end of other string */ |
638 | match = i; /* This is the match */ |
639 | goto botched; /* And exit the loop now */ |
640 | } |
641 | if (match == -1) { /* If no match currently */ |
642 | match = i; /* Then this is it, here */ |
643 | break; /* Stop looking now */ |
644 | } else { |
645 | match = -1; /* Else it's ambiguous */ |
646 | goto botched; /* So give up right now */ |
647 | } |
648 | } |
649 | else if (*q != *r) /* Otherwise if mismatch */ |
650 | break; /* Abort this loop */ |
651 | q++, r++; /* Increment the counters */ |
652 | } |
653 | } |
654 | |
655 | botched: |
656 | if (match == -1) { /* If we couldn't find a match */ |
657 | if (data->err) { |
5b59e227 |
658 | fprintf(stderr, "%s: unrecognized option `%s%s'\n", |
b91e2391 |
659 | data->prog, |
660 | prefix, p); |
661 | } |
662 | return ('?'); |
663 | } |
664 | |
665 | if (longind) /* Allow longind to be null */ |
666 | *longind = match; /* Store the match away */ |
667 | |
668 | /* --- Handle argument behaviour --- */ |
669 | |
670 | while (*p != 0 && *p != '=') /* Find the argument string */ |
671 | p++; |
672 | p = (*p ? p + 1 : 0); /* Sort out argument presence */ |
673 | q = (char *) longopts[match].name; /* Remember the name here */ |
674 | |
675 | switch (longopts[match].has_arg & 3) { |
676 | case no_argument: |
677 | if (p) { |
678 | if (data->err) { |
679 | fprintf(stderr, |
680 | "%s: option `%s%s' does not accept arguments\n", |
681 | data->prog, |
682 | prefix, q); |
683 | } |
684 | return ('?'); |
685 | } |
686 | break; |
687 | |
688 | case required_argument: |
689 | if (!p) { /* If no argument given */ |
690 | p = mo__nextWord(argc, argv, data); |
691 | |
692 | if (!p) { /* If no more arguments */ |
693 | if (data->err) { |
694 | fprintf(stderr, "%s: option `%s%s' requires an argument\n", |
695 | data->prog, |
696 | prefix, q); |
697 | } |
698 | return (noarg); |
699 | } |
700 | |
701 | mo__permute(argv, data); |
702 | } |
703 | break; |
704 | |
705 | case optional_argument: |
706 | /* Who cares? */ |
707 | break; |
708 | } |
709 | data->arg = p; |
710 | |
711 | /* --- Do correct things now we have a match --- */ |
712 | |
713 | if (longopts[match].flag) { /* If he has a @flag@ argument */ |
714 | if (longopts[match].has_arg & gFlag_switch) { |
715 | if (data->order & ord__negate) |
716 | *longopts[match].flag &= ~longopts[match].val; |
717 | else |
718 | *longopts[match].flag |= longopts[match].val; |
719 | } else { |
720 | if (data->order & ord__negate) |
721 | *longopts[match].flag = 0; |
722 | else |
723 | *longopts[match].flag = longopts[match].val; |
724 | } |
725 | return (0); /* And return something */ |
726 | } else { |
727 | if (data->order & ord__negate) |
728 | return (longopts[match].val | gFlag_negated); |
729 | else |
730 | return (longopts[match].val); |
731 | } |
732 | } |
733 | |
734 | /* --- Do short options things --- */ |
735 | |
736 | else { |
737 | if (p[0] == '+') /* If starts with a `%|+|%' */ |
738 | data->order |= ord__negate; |
739 | data->list = p + 1; /* Omit leading `%|-|%'/`%|+|%' */ |
740 | } |
741 | } |
742 | |
743 | /* --- Now process the short options --- */ |
744 | |
745 | i = *data->list++; /* Get the next option letter */ |
746 | data->opt = i; /* Store this away nicely */ |
747 | |
748 | p = (char *) mo__findOpt(i, shortopt, data); |
749 | if (!p) { /* No more options left */ |
750 | if (data->err) { |
751 | fprintf(stderr, "%s: unknown option `%c%c'\n", |
752 | data->prog, |
753 | data->order & ord__negate ? '+' : '-', |
754 | i); |
755 | } |
756 | return ('?'); |
757 | } |
758 | |
759 | data->opt = i; /* Store this for the caller */ |
760 | |
761 | /* --- Sort out an argument, if we expect one --- */ |
762 | |
763 | if (p[0] == ':') { /* If we expect an option */ |
764 | q = (data->list[0] ? data->list : 0); /* If argument expected, use it */ |
765 | data->list = 0; /* Kill the remaining options */ |
766 | if (p[1] != ':' && !q) { /* If no arg, and not optional */ |
767 | |
768 | /* --- Same code as before --- */ |
769 | |
770 | q = mo__nextWord(argc, argv, data); /* Read the next word */ |
771 | if (!q) { /* If no more arguments */ |
772 | if (data->err) { |
773 | fprintf(stderr, "%s: option `%c%c' requires an argument\n", |
774 | data->prog, |
775 | data->order & ord__negate ? '+' : '-', |
776 | i); |
777 | } |
778 | return (noarg); |
779 | } |
780 | mo__permute(argv, data); |
781 | } |
782 | |
783 | data->arg = q; |
784 | } |
785 | return ((data->order & ord__negate) ? i | gFlag_negated : i); |
786 | } |
787 | |
788 | /*----- That's all, folks -------------------------------------------------*/ |