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comparison: src/getopt.c

src/getopt.c

branch
cpw.khc.msnp14
changeset 20472
6a6d2ef151e6
parent 13912
463b4fa9f067
parent 20469
b2836a24d81e
child 20473
91e1b3a49d10
equal deleted inserted replaced
13912:463b4fa9f067 20472:6a6d2ef151e6
1 /* Getopt for GNU.
2 NOTE: getopt is now part of the C library, so if you don't know what
3 "Keep this file name-space clean" means, talk to roland@gnu.ai.mit.edu
4 before changing it!
5
6 Gaim is the legal property of its developers, whose names are too numerous
7 to list here. Please refer to the COPYRIGHT file distributed with this
8 source distribution.
9
10 This program is free software; you can redistribute it and/or modify it
11 under the terms of the GNU General Public License as published by the
12 Free Software Foundation; either version 2, or (at your option) any
13 later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
23
24 /* NOTE!!! AIX requires this to be the first thing in the file.
25 Do not put ANYTHING before it! */
26 #if !defined (__GNUC__) && defined (_AIX)
27 #pragma alloca
28 #endif
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 /* Alver says we need this for IRIX. */
35 #if HAVE_STRING_H
36 #include "string.h"
37 #endif
38
39 #ifdef __GNUC__
40 #define alloca __builtin_alloca
41 #else /* not __GNUC__ */
42 #if defined (HAVE_ALLOCA_H) || (defined(sparc) && (defined(sun) || (!defined(USG) && !defined(SVR4) && !defined(__svr4__))))
43 #include <alloca.h>
44 #else
45 #ifndef _AIX
46 char *alloca ();
47 #endif
48 #endif /* alloca.h */
49 #endif /* not __GNUC__ */
50
51 #if !__STDC__ && !defined(const) && IN_GCC
52 #define const
53 #endif
54
55 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>. */
56 #ifndef _NO_PROTO
57 #define _NO_PROTO
58 #endif
59
60 #include <stdio.h>
61
62 /* Comment out all this code if we are using the GNU C Library, and are not
63 actually compiling the library itself. This code is part of the GNU C
64 Library, but also included in many other GNU distributions. Compiling
65 and linking in this code is a waste when using the GNU C library
66 (especially if it is a shared library). Rather than having every GNU
67 program understand `configure --with-gnu-libc' and omit the object files,
68 it is simpler to just do this in the source for each such file. */
69
70 #if defined (_LIBC) || !defined (__GNU_LIBRARY__)
71
72
73 /* This needs to come after some library #include
74 to get __GNU_LIBRARY__ defined. */
75 #ifdef __GNU_LIBRARY__
76 #undef alloca
77 /* Don't include stdlib.h for non-GNU C libraries because some of them
78 contain conflicting prototypes for getopt. */
79 #include <stdlib.h>
80 #else /* Not GNU C library. */
81 #define __alloca alloca
82 #endif /* GNU C library. */
83
84 /* If GETOPT_COMPAT is defined, `+' as well as `--' can introduce a
85 long-named option. Because this is not POSIX.2 compliant, it is
86 being phased out. */
87 /* #define GETOPT_COMPAT */
88
89 /* This version of `getopt' appears to the caller like standard Unix `getopt'
90 but it behaves differently for the user, since it allows the user
91 to intersperse the options with the other arguments.
92
93 As `getopt' works, it permutes the elements of ARGV so that,
94 when it is done, all the options precede everything else. Thus
95 all application programs are extended to handle flexible argument order.
96
97 Setting the environment variable POSIXLY_CORRECT disables permutation.
98 Then the behavior is completely standard.
99
100 GNU application programs can use a third alternative mode in which
101 they can distinguish the relative order of options and other arguments. */
102
103 #include "getopt.h"
104
105 /* For communication from `getopt' to the caller.
106 When `getopt' finds an option that takes an argument,
107 the argument value is returned here.
108 Also, when `ordering' is RETURN_IN_ORDER,
109 each non-option ARGV-element is returned here. */
110
111 char *optarg = 0;
112
113 /* Index in ARGV of the next element to be scanned.
114 This is used for communication to and from the caller
115 and for communication between successive calls to `getopt'.
116
117 On entry to `getopt', zero means this is the first call; initialize.
118
119 When `getopt' returns EOF, this is the index of the first of the
120 non-option elements that the caller should itself scan.
121
122 Otherwise, `optind' communicates from one call to the next
123 how much of ARGV has been scanned so far. */
124
125 /* XXX 1003.2 says this must be 1 before any call. */
126 int optind = 0;
127
128 /* The next char to be scanned in the option-element
129 in which the last option character we returned was found.
130 This allows us to pick up the scan where we left off.
131
132 If this is zero, or a null string, it means resume the scan
133 by advancing to the next ARGV-element. */
134
135 static char *nextchar;
136
137 /* Callers store zero here to inhibit the error message
138 for unrecognized options. */
139
140 int opterr = 1;
141
142 /* Set to an option character which was unrecognized.
143 This must be initialized on some systems to avoid linking in the
144 system's own getopt implementation. */
145
146 int optopt = '?';
147
148 /* Describe how to deal with options that follow non-option ARGV-elements.
149
150 If the caller did not specify anything,
151 the default is REQUIRE_ORDER if the environment variable
152 POSIXLY_CORRECT is defined, PERMUTE otherwise.
153
154 REQUIRE_ORDER means don't recognize them as options;
155 stop option processing when the first non-option is seen.
156 This is what Unix does.
157 This mode of operation is selected by either setting the environment
158 variable POSIXLY_CORRECT, or using `+' as the first character
159 of the list of option characters.
160
161 PERMUTE is the default. We permute the contents of ARGV as we scan,
162 so that eventually all the non-options are at the end. This allows options
163 to be given in any order, even with programs that were not written to
164 expect this.
165
166 RETURN_IN_ORDER is an option available to programs that were written
167 to expect options and other ARGV-elements in any order and that care about
168 the ordering of the two. We describe each non-option ARGV-element
169 as if it were the argument of an option with character code 1.
170 Using `-' as the first character of the list of option characters
171 selects this mode of operation.
172
173 The special argument `--' forces an end of option-scanning regardless
174 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
175 `--' can cause `getopt' to return EOF with `optind' != ARGC. */
176
177 static enum
178 {
179 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
180 } ordering;
181
182 #ifdef __GNU_LIBRARY__
183 /* We want to avoid inclusion of string.h with non-GNU libraries
184 because there are many ways it can cause trouble.
185 On some systems, it contains special magic macros that don't work
186 in GCC. */
187 #include <string.h>
188 #define my_index strchr
189 #define my_bcopy(src, dst, n) memcpy ((dst), (src), (n))
190 #else
191
192 /* Avoid depending on library functions or files
193 whose names are inconsistent. */
194
195 char *getenv ();
196
197 static char *
198 my_index (str, chr)
199 const char *str;
200 int chr;
201 {
202 while (*str)
203 {
204 if (*str == chr)
205 return (char *) str;
206 str++;
207 }
208 return 0;
209 }
210
211 static void
212 my_bcopy (from, to, size)
213 const char *from;
214 char *to;
215 int size;
216 {
217 int i;
218 for (i = 0; i < size; i++)
219 to[i] = from[i];
220 }
221 #endif /* GNU C library. */
222
223 /* Handle permutation of arguments. */
224
225 /* Describe the part of ARGV that contains non-options that have
226 been skipped. `first_nonopt' is the index in ARGV of the first of them;
227 `last_nonopt' is the index after the last of them. */
228
229 static int first_nonopt;
230 static int last_nonopt;
231
232 /* Exchange two adjacent subsequences of ARGV.
233 One subsequence is elements [first_nonopt,last_nonopt)
234 which contains all the non-options that have been skipped so far.
235 The other is elements [last_nonopt,optind), which contains all
236 the options processed since those non-options were skipped.
237
238 `first_nonopt' and `last_nonopt' are relocated so that they describe
239 the new indices of the non-options in ARGV after they are moved. */
240
241 static void
242 exchange (argv)
243 char **argv;
244 {
245 int nonopts_size = (last_nonopt - first_nonopt) * sizeof (char *);
246 char **temp = (char **) __alloca (nonopts_size);
247
248 /* Interchange the two blocks of data in ARGV. */
249
250 my_bcopy ((char *) &argv[first_nonopt], (char *) temp, nonopts_size);
251 my_bcopy ((char *) &argv[last_nonopt], (char *) &argv[first_nonopt],
252 (optind - last_nonopt) * sizeof (char *));
253 my_bcopy ((char *) temp,
254 (char *) &argv[first_nonopt + optind - last_nonopt],
255 nonopts_size);
256
257 /* Update records for the slots the non-options now occupy. */
258
259 first_nonopt += (optind - last_nonopt);
260 last_nonopt = optind;
261 }
262
263 /* Scan elements of ARGV (whose length is ARGC) for option characters
264 given in OPTSTRING.
265
266 If an element of ARGV starts with '-', and is not exactly "-" or "--",
267 then it is an option element. The characters of this element
268 (aside from the initial '-') are option characters. If `getopt'
269 is called repeatedly, it returns successively each of the option characters
270 from each of the option elements.
271
272 If `getopt' finds another option character, it returns that character,
273 updating `optind' and `nextchar' so that the next call to `getopt' can
274 resume the scan with the following option character or ARGV-element.
275
276 If there are no more option characters, `getopt' returns `EOF'.
277 Then `optind' is the index in ARGV of the first ARGV-element
278 that is not an option. (The ARGV-elements have been permuted
279 so that those that are not options now come last.)
280
281 OPTSTRING is a string containing the legitimate option characters.
282 If an option character is seen that is not listed in OPTSTRING,
283 return '?' after printing an error message. If you set `opterr' to
284 zero, the error message is suppressed but we still return '?'.
285
286 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
287 so the following text in the same ARGV-element, or the text of the following
288 ARGV-element, is returned in `optarg'. Two colons mean an option that
289 wants an optional arg; if there is text in the current ARGV-element,
290 it is returned in `optarg', otherwise `optarg' is set to zero.
291
292 If OPTSTRING starts with `-' or `+', it requests different methods of
293 handling the non-option ARGV-elements.
294 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
295
296 Long-named options begin with `--' instead of `-'.
297 Their names may be abbreviated as long as the abbreviation is unique
298 or is an exact match for some defined option. If they have an
299 argument, it follows the option name in the same ARGV-element, separated
300 from the option name by a `=', or else the in next ARGV-element.
301 When `getopt' finds a long-named option, it returns 0 if that option's
302 `flag' field is nonzero, the value of the option's `val' field
303 if the `flag' field is zero.
304
305 The elements of ARGV aren't really const, because we permute them.
306 But we pretend they're const in the prototype to be compatible
307 with other systems.
308
309 LONGOPTS is a vector of `struct option' terminated by an
310 element containing a name which is zero.
311
312 LONGIND returns the index in LONGOPT of the long-named option found.
313 It is only valid when a long-named option has been found by the most
314 recent call.
315
316 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
317 long-named options. */
318
319 int
320 _getopt_internal (argc, argv, optstring, longopts, longind, long_only)
321 int argc;
322 char *const *argv;
323 const char *optstring;
324 const struct option *longopts;
325 int *longind;
326 int long_only;
327 {
328 int option_index;
329
330 optarg = 0;
331
332 /* Initialize the internal data when the first call is made.
333 Start processing options with ARGV-element 1 (since ARGV-element 0
334 is the program name); the sequence of previously skipped
335 non-option ARGV-elements is empty. */
336
337 if (optind == 0)
338 {
339 first_nonopt = last_nonopt = optind = 1;
340
341 nextchar = NULL;
342
343 /* Determine how to handle the ordering of options and nonoptions. */
344
345 if (optstring[0] == '-')
346 {
347 ordering = RETURN_IN_ORDER;
348 ++optstring;
349 }
350 else if (optstring[0] == '+')
351 {
352 ordering = REQUIRE_ORDER;
353 ++optstring;
354 }
355 else if (getenv ("POSIXLY_CORRECT") != NULL)
356 ordering = REQUIRE_ORDER;
357 else
358 ordering = PERMUTE;
359 }
360
361 if (nextchar == NULL || *nextchar == '\0')
362 {
363 if (ordering == PERMUTE)
364 {
365 /* If we have just processed some options following some non-options,
366 exchange them so that the options come first. */
367
368 if (first_nonopt != last_nonopt && last_nonopt != optind)
369 exchange ((char **) argv);
370 else if (last_nonopt != optind)
371 first_nonopt = optind;
372
373 /* Now skip any additional non-options
374 and extend the range of non-options previously skipped. */
375
376 while (optind < argc
377 && (argv[optind][0] != '-' || argv[optind][1] == '\0')
378 #ifdef GETOPT_COMPAT
379 && (longopts == NULL
380 || argv[optind][0] != '+' || argv[optind][1] == '\0')
381 #endif /* GETOPT_COMPAT */
382 )
383 optind++;
384 last_nonopt = optind;
385 }
386
387 /* Special ARGV-element `--' means premature end of options.
388 Skip it like a null option,
389 then exchange with previous non-options as if it were an option,
390 then skip everything else like a non-option. */
391
392 if (optind != argc && !strcmp (argv[optind], "--"))
393 {
394 optind++;
395
396 if (first_nonopt != last_nonopt && last_nonopt != optind)
397 exchange ((char **) argv);
398 else if (first_nonopt == last_nonopt)
399 first_nonopt = optind;
400 last_nonopt = argc;
401
402 optind = argc;
403 }
404
405 /* If we have done all the ARGV-elements, stop the scan
406 and back over any non-options that we skipped and permuted. */
407
408 if (optind == argc)
409 {
410 /* Set the next-arg-index to point at the non-options
411 that we previously skipped, so the caller will digest them. */
412 if (first_nonopt != last_nonopt)
413 optind = first_nonopt;
414 return EOF;
415 }
416
417 /* If we have come to a non-option and did not permute it,
418 either stop the scan or describe it to the caller and pass it by. */
419
420 if ((argv[optind][0] != '-' || argv[optind][1] == '\0')
421 #ifdef GETOPT_COMPAT
422 && (longopts == NULL
423 || argv[optind][0] != '+' || argv[optind][1] == '\0')
424 #endif /* GETOPT_COMPAT */
425 )
426 {
427 if (ordering == REQUIRE_ORDER)
428 return EOF;
429 optarg = argv[optind++];
430 return 1;
431 }
432
433 /* We have found another option-ARGV-element.
434 Start decoding its characters. */
435
436 nextchar = (argv[optind] + 1
437 + (longopts != NULL && argv[optind][1] == '-'));
438 }
439
440 if (longopts != NULL
441 && ((argv[optind][0] == '-'
442 && (argv[optind][1] == '-' || long_only))
443 #ifdef GETOPT_COMPAT
444 || argv[optind][0] == '+'
445 #endif /* GETOPT_COMPAT */
446 ))
447 {
448 const struct option *p;
449 char *s = nextchar;
450 int exact = 0;
451 int ambig = 0;
452 const struct option *pfound = NULL;
453 int indfound;
454
455 while (*s && *s != '=')
456 s++;
457
458 /* Test all options for either exact match or abbreviated matches. */
459 for (p = longopts, option_index = 0; p->name;
460 p++, option_index++)
461 if (!strncmp (p->name, nextchar, s - nextchar))
462 {
463 if (s - nextchar == strlen (p->name))
464 {
465 /* Exact match found. */
466 pfound = p;
467 indfound = option_index;
468 exact = 1;
469 break;
470 }
471 else if (pfound == NULL)
472 {
473 /* First nonexact match found. */
474 pfound = p;
475 indfound = option_index;
476 }
477 else
478 /* Second nonexact match found. */
479 ambig = 1;
480 }
481
482 if (ambig && !exact)
483 {
484 if (opterr)
485 fprintf (stderr, "%s: option `%s' is ambiguous\n",
486 argv[0], argv[optind]);
487 nextchar += strlen (nextchar);
488 optind++;
489 return '?';
490 }
491
492 if (pfound != NULL)
493 {
494 option_index = indfound;
495 optind++;
496 if (*s)
497 {
498 /* Don't test has_arg with >, because some C compilers don't
499 allow it to be used on enums. */
500 if (pfound->has_arg)
501 optarg = s + 1;
502 else
503 {
504 if (opterr)
505 {
506 if (argv[optind - 1][1] == '-')
507 /* --option */
508 fprintf (stderr,
509 "%s: option `--%s' doesn't allow an argument\n",
510 argv[0], pfound->name);
511 else
512 /* +option or -option */
513 fprintf (stderr,
514 "%s: option `%c%s' doesn't allow an argument\n",
515 argv[0], argv[optind - 1][0], pfound->name);
516 }
517 nextchar += strlen (nextchar);
518 return '?';
519 }
520 }
521 else if (pfound->has_arg == 1)
522 {
523 if (optind < argc)
524 optarg = argv[optind++];
525 else
526 {
527 if (opterr)
528 fprintf (stderr, "%s: option `%s' requires an argument\n",
529 argv[0], argv[optind - 1]);
530 nextchar += strlen (nextchar);
531 return optstring[0] == ':' ? ':' : '?';
532 }
533 }
534 nextchar += strlen (nextchar);
535 if (longind != NULL)
536 *longind = option_index;
537 if (pfound->flag)
538 {
539 *(pfound->flag) = pfound->val;
540 return 0;
541 }
542 return pfound->val;
543 }
544 /* Can't find it as a long option. If this is not getopt_long_only,
545 or the option starts with '--' or is not a valid short
546 option, then it's an error.
547 Otherwise interpret it as a short option. */
548 if (!long_only || argv[optind][1] == '-'
549 #ifdef GETOPT_COMPAT
550 || argv[optind][0] == '+'
551 #endif /* GETOPT_COMPAT */
552 || my_index (optstring, *nextchar) == NULL)
553 {
554 if (opterr)
555 {
556 if (argv[optind][1] == '-')
557 /* --option */
558 fprintf (stderr, "%s: unrecognized option `--%s'\n",
559 argv[0], nextchar);
560 else
561 /* +option or -option */
562 fprintf (stderr, "%s: unrecognized option `%c%s'\n",
563 argv[0], argv[optind][0], nextchar);
564 }
565 nextchar = (char *) "";
566 optind++;
567 return '?';
568 }
569 }
570
571 /* Look at and handle the next option-character. */
572
573 {
574 char c = *nextchar++;
575 char *temp = my_index (optstring, c);
576
577 /* Increment `optind' when we start to process its last character. */
578 if (*nextchar == '\0')
579 ++optind;
580
581 if (temp == NULL || c == ':')
582 {
583 if (opterr)
584 {
585 #if 0
586 if (c < 040 || c >= 0177)
587 fprintf (stderr, "%s: unrecognized option, character code 0%o\n",
588 argv[0], c);
589 else
590 fprintf (stderr, "%s: unrecognized option `-%c'\n", argv[0], c);
591 #else
592 /* 1003.2 specifies the format of this message. */
593 fprintf (stderr, "%s: illegal option -- %c\n", argv[0], c);
594 #endif
595 }
596 optopt = c;
597 return '?';
598 }
599 if (temp[1] == ':')
600 {
601 if (temp[2] == ':')
602 {
603 /* This is an option that accepts an argument optionally. */
604 if (*nextchar != '\0')
605 {
606 optarg = nextchar;
607 optind++;
608 }
609 else
610 optarg = 0;
611 nextchar = NULL;
612 }
613 else
614 {
615 /* This is an option that requires an argument. */
616 if (*nextchar != '\0')
617 {
618 optarg = nextchar;
619 /* If we end this ARGV-element by taking the rest as an arg,
620 we must advance to the next element now. */
621 optind++;
622 }
623 else if (optind == argc)
624 {
625 if (opterr)
626 {
627 #if 0
628 fprintf (stderr, "%s: option `-%c' requires an argument\n",
629 argv[0], c);
630 #else
631 /* 1003.2 specifies the format of this message. */
632 fprintf (stderr, "%s: option requires an argument -- %c\n",
633 argv[0], c);
634 #endif
635 }
636 optopt = c;
637 if (optstring[0] == ':')
638 c = ':';
639 else
640 c = '?';
641 }
642 else
643 /* We already incremented `optind' once;
644 increment it again when taking next ARGV-elt as argument. */
645 optarg = argv[optind++];
646 nextchar = NULL;
647 }
648 }
649 return c;
650 }
651 }
652
653 int
654 getopt (argc, argv, optstring)
655 int argc;
656 char *const *argv;
657 const char *optstring;
658 {
659 return _getopt_internal (argc, argv, optstring,
660 (const struct option *) 0,
661 (int *) 0,
662 0);
663 }
664
665 #endif /* _LIBC or not __GNU_LIBRARY__. */
666
667 #ifdef TEST
668
669 /* Compile with -DTEST to make an executable for use in testing
670 the above definition of `getopt'. */
671
672 int
673 main (argc, argv)
674 int argc;
675 char **argv;
676 {
677 int c;
678 int digit_optind = 0;
679
680 while (1)
681 {
682 int this_option_optind = optind ? optind : 1;
683
684 c = getopt (argc, argv, "abc:d:0123456789");
685 if (c == EOF)
686 break;
687
688 switch (c)
689 {
690 case '0':
691 case '1':
692 case '2':
693 case '3':
694 case '4':
695 case '5':
696 case '6':
697 case '7':
698 case '8':
699 case '9':
700 if (digit_optind != 0 && digit_optind != this_option_optind)
701 printf ("digits occur in two different argv-elements.\n");
702 digit_optind = this_option_optind;
703 printf ("option %c\n", c);
704 break;
705
706 case 'a':
707 printf ("option a\n");
708 break;
709
710 case 'b':
711 printf ("option b\n");
712 break;
713
714 case 'c':
715 printf ("option c with value `%s'\n", optarg);
716 break;
717
718 case '?':
719 break;
720
721 default:
722 printf ("?? getopt returned character code 0%o ??\n", c);
723 }
724 }
725
726 if (optind < argc)
727 {
728 printf ("non-option ARGV-elements: ");
729 while (optind < argc)
730 printf ("%s ", argv[optind++]);
731 printf ("\n");
732 }
733
734 exit (0);
735 }
736
737 #endif /* TEST */

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