Annotation of embedaddon/mtr/portability/getopt.c, revision 1.1.1.1
1.1 misho 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: Copyright (C) 1987, 88, 89, 90, 91, 92, 93, 94, 95
7: Free Software Foundation, Inc.
8:
9: This program is free software; you can redistribute it and/or modify it
10: under the terms of the GNU General Public License as published by the
11: Free Software Foundation; either version 2, or (at your option) any
12: later version.
13:
14: This program is distributed in the hope that it will be useful,
15: but WITHOUT ANY WARRANTY; without even the implied warranty of
16: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: GNU General Public License for more details.
18:
19: You should have received a copy of the GNU General Public License
20: along with this program; if not, write to the Free Software
21: Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
22:
23: /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
24: Ditto for AIX 3.2 and <stdlib.h>. */
25: #ifndef _NO_PROTO
26: #define _NO_PROTO
27: #endif
28:
29: #ifdef HAVE_CONFIG_H
30: #include "config.h"
31: #endif
32:
33: #if !defined (__STDC__) || !__STDC__
34: /* This is a separate conditional since some stdc systems
35: reject `defined (const)'. */
36: #ifndef const
37: #define const
38: #endif
39: #endif
40:
41: #include <stdio.h>
42: #include <string.h>
43:
44: /* Comment out all this code if we are using the GNU C Library, and are not
45: actually compiling the library itself. This code is part of the GNU C
46: Library, but also included in many other GNU distributions. Compiling
47: and linking in this code is a waste when using the GNU C library
48: (especially if it is a shared library). Rather than having every GNU
49: program understand `configure --with-gnu-libc' and omit the object files,
50: it is simpler to just do this in the source for each such file. */
51:
52: #if defined (_LIBC) || !defined (__GNU_LIBRARY__)
53:
54:
55: /* This needs to come after some library #include
56: to get __GNU_LIBRARY__ defined. */
57: #ifdef __GNU_LIBRARY__
58: /* Don't include stdlib.h for non-GNU C libraries because some of them
59: contain conflicting prototypes for getopt. */
60: #include <stdlib.h>
61: #endif /* GNU C library. */
62:
63: #ifndef _
64: /* This is for other GNU distributions with internationalized messages.
65: When compiling libc, the _ macro is predefined. */
66: #ifdef HAVE_LIBINTL_H
67: # include <libintl.h>
68: # define _(msgid) gettext (msgid)
69: #else
70: # define _(msgid) (msgid)
71: #endif
72: #endif
73:
74: /* This version of `getopt' appears to the caller like standard Unix `getopt'
75: but it behaves differently for the user, since it allows the user
76: to intersperse the options with the other arguments.
77:
78: As `getopt' works, it permutes the elements of ARGV so that,
79: when it is done, all the options precede everything else. Thus
80: all application programs are extended to handle flexible argument order.
81:
82: Setting the environment variable POSIXLY_CORRECT disables permutation.
83: Then the behavior is completely standard.
84:
85: GNU application programs can use a third alternative mode in which
86: they can distinguish the relative order of options and other arguments. */
87:
88: #include "getopt.h"
89:
90: /* For communication from `getopt' to the caller.
91: When `getopt' finds an option that takes an argument,
92: the argument value is returned here.
93: Also, when `ordering' is RETURN_IN_ORDER,
94: each non-option ARGV-element is returned here. */
95:
96: char *optarg = NULL;
97:
98: /* Index in ARGV of the next element to be scanned.
99: This is used for communication to and from the caller
100: and for communication between successive calls to `getopt'.
101:
102: On entry to `getopt', zero means this is the first call; initialize.
103:
104: When `getopt' returns EOF, this is the index of the first of the
105: non-option elements that the caller should itself scan.
106:
107: Otherwise, `optind' communicates from one call to the next
108: how much of ARGV has been scanned so far. */
109:
110: /* XXX 1003.2 says this must be 1 before any call. */
111: int optind = 0;
112:
113: /* The next char to be scanned in the option-element
114: in which the last option character we returned was found.
115: This allows us to pick up the scan where we left off.
116:
117: If this is zero, or a null string, it means resume the scan
118: by advancing to the next ARGV-element. */
119:
120: static char *nextchar;
121:
122: /* Callers store zero here to inhibit the error message
123: for unrecognized options. */
124:
125: int opterr = 1;
126:
127: /* Set to an option character which was unrecognized.
128: This must be initialized on some systems to avoid linking in the
129: system's own getopt implementation. */
130:
131: int optopt = '?';
132:
133: /* Describe how to deal with options that follow non-option ARGV-elements.
134:
135: If the caller did not specify anything,
136: the default is REQUIRE_ORDER if the environment variable
137: POSIXLY_CORRECT is defined, PERMUTE otherwise.
138:
139: REQUIRE_ORDER means don't recognize them as options;
140: stop option processing when the first non-option is seen.
141: This is what Unix does.
142: This mode of operation is selected by either setting the environment
143: variable POSIXLY_CORRECT, or using `+' as the first character
144: of the list of option characters.
145:
146: PERMUTE is the default. We permute the contents of ARGV as we scan,
147: so that eventually all the non-options are at the end. This allows options
148: to be given in any order, even with programs that were not written to
149: expect this.
150:
151: RETURN_IN_ORDER is an option available to programs that were written
152: to expect options and other ARGV-elements in any order and that care about
153: the ordering of the two. We describe each non-option ARGV-element
154: as if it were the argument of an option with character code 1.
155: Using `-' as the first character of the list of option characters
156: selects this mode of operation.
157:
158: The special argument `--' forces an end of option-scanning regardless
159: of the value of `ordering'. In the case of RETURN_IN_ORDER, only
160: `--' can cause `getopt' to return EOF with `optind' != ARGC. */
161:
162: static enum
163: {
164: REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
165: } ordering;
166:
167: /* Value of POSIXLY_CORRECT environment variable. */
168: static char *posixly_correct;
169:
170: #ifdef __GNU_LIBRARY__
171: /* We want to avoid inclusion of string.h with non-GNU libraries
172: because there are many ways it can cause trouble.
173: On some systems, it contains special magic macros that don't work
174: in GCC. */
175: #include <string.h>
176: #define my_index strchr
177: #else
178:
179: /* Avoid depending on library functions or files
180: whose names are inconsistent. */
181:
182: char *getenv ();
183:
184: static char *
185: my_index (str, chr)
186: const char *str;
187: int chr;
188: {
189: while (*str)
190: {
191: if (*str == chr)
192: return (char *) str;
193: str++;
194: }
195: return 0;
196: }
197:
198: /* If using GCC, we can safely declare strlen this way.
199: If not using GCC, it is ok not to declare it. */
200: #ifdef __GNUC__
201: /* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
202: That was relevant to code that was here before. */
203: #if !defined (__STDC__) || !__STDC__
204: /* gcc with -traditional declares the built-in strlen to return int,
205: and has done so at least since version 2.4.5. -- rms. */
206: extern int strlen (const char *);
207: #endif /* not __STDC__ */
208: #endif /* __GNUC__ */
209:
210: #endif /* not __GNU_LIBRARY__ */
211:
212: /* Handle permutation of arguments. */
213:
214: /* Describe the part of ARGV that contains non-options that have
215: been skipped. `first_nonopt' is the index in ARGV of the first of them;
216: `last_nonopt' is the index after the last of them. */
217:
218: static int first_nonopt;
219: static int last_nonopt;
220:
221: /* Exchange two adjacent subsequences of ARGV.
222: One subsequence is elements [first_nonopt,last_nonopt)
223: which contains all the non-options that have been skipped so far.
224: The other is elements [last_nonopt,optind), which contains all
225: the options processed since those non-options were skipped.
226:
227: `first_nonopt' and `last_nonopt' are relocated so that they describe
228: the new indices of the non-options in ARGV after they are moved. */
229:
230: static void
231: exchange (argv)
232: char **argv;
233: {
234: int bottom = first_nonopt;
235: int middle = last_nonopt;
236: int top = optind;
237: char *tem;
238:
239: /* Exchange the shorter segment with the far end of the longer segment.
240: That puts the shorter segment into the right place.
241: It leaves the longer segment in the right place overall,
242: but it consists of two parts that need to be swapped next. */
243:
244: while (top > middle && middle > bottom)
245: {
246: if (top - middle > middle - bottom)
247: {
248: /* Bottom segment is the short one. */
249: int len = middle - bottom;
250: register int i;
251:
252: /* Swap it with the top part of the top segment. */
253: for (i = 0; i < len; i++)
254: {
255: tem = argv[bottom + i];
256: argv[bottom + i] = argv[top - (middle - bottom) + i];
257: argv[top - (middle - bottom) + i] = tem;
258: }
259: /* Exclude the moved bottom segment from further swapping. */
260: top -= len;
261: }
262: else
263: {
264: /* Top segment is the short one. */
265: int len = top - middle;
266: register int i;
267:
268: /* Swap it with the bottom part of the bottom segment. */
269: for (i = 0; i < len; i++)
270: {
271: tem = argv[bottom + i];
272: argv[bottom + i] = argv[middle + i];
273: argv[middle + i] = tem;
274: }
275: /* Exclude the moved top segment from further swapping. */
276: bottom += len;
277: }
278: }
279:
280: /* Update records for the slots the non-options now occupy. */
281:
282: first_nonopt += (optind - last_nonopt);
283: last_nonopt = optind;
284: }
285:
286: /* Initialize the internal data when the first call is made. */
287:
288: static const char *
289: _getopt_initialize (optstring)
290: const char *optstring;
291: {
292: /* Start processing options with ARGV-element 1 (since ARGV-element 0
293: is the program name); the sequence of previously skipped
294: non-option ARGV-elements is empty. */
295:
296: first_nonopt = last_nonopt = optind = 1;
297:
298: nextchar = NULL;
299:
300: posixly_correct = getenv ("POSIXLY_CORRECT");
301:
302: /* Determine how to handle the ordering of options and nonoptions. */
303:
304: if (optstring[0] == '-')
305: {
306: ordering = RETURN_IN_ORDER;
307: ++optstring;
308: }
309: else if (optstring[0] == '+')
310: {
311: ordering = REQUIRE_ORDER;
312: ++optstring;
313: }
314: else if (posixly_correct != NULL)
315: ordering = REQUIRE_ORDER;
316: else
317: ordering = PERMUTE;
318:
319: return optstring;
320: }
321:
322: /* Scan elements of ARGV (whose length is ARGC) for option characters
323: given in OPTSTRING.
324:
325: If an element of ARGV starts with '-', and is not exactly "-" or "--",
326: then it is an option element. The characters of this element
327: (aside from the initial '-') are option characters. If `getopt'
328: is called repeatedly, it returns successively each of the option characters
329: from each of the option elements.
330:
331: If `getopt' finds another option character, it returns that character,
332: updating `optind' and `nextchar' so that the next call to `getopt' can
333: resume the scan with the following option character or ARGV-element.
334:
335: If there are no more option characters, `getopt' returns `EOF'.
336: Then `optind' is the index in ARGV of the first ARGV-element
337: that is not an option. (The ARGV-elements have been permuted
338: so that those that are not options now come last.)
339:
340: OPTSTRING is a string containing the legitimate option characters.
341: If an option character is seen that is not listed in OPTSTRING,
342: return '?' after printing an error message. If you set `opterr' to
343: zero, the error message is suppressed but we still return '?'.
344:
345: If a char in OPTSTRING is followed by a colon, that means it wants an arg,
346: so the following text in the same ARGV-element, or the text of the following
347: ARGV-element, is returned in `optarg'. Two colons mean an option that
348: wants an optional arg; if there is text in the current ARGV-element,
349: it is returned in `optarg', otherwise `optarg' is set to zero.
350:
351: If OPTSTRING starts with `-' or `+', it requests different methods of
352: handling the non-option ARGV-elements.
353: See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
354:
355: Long-named options begin with `--' instead of `-'.
356: Their names may be abbreviated as long as the abbreviation is unique
357: or is an exact match for some defined option. If they have an
358: argument, it follows the option name in the same ARGV-element, separated
359: from the option name by a `=', or else the in next ARGV-element.
360: When `getopt' finds a long-named option, it returns 0 if that option's
361: `flag' field is nonzero, the value of the option's `val' field
362: if the `flag' field is zero.
363:
364: The elements of ARGV aren't really const, because we permute them.
365: But we pretend they're const in the prototype to be compatible
366: with other systems.
367:
368: LONGOPTS is a vector of `struct option' terminated by an
369: element containing a name which is zero.
370:
371: LONGIND returns the index in LONGOPT of the long-named option found.
372: It is only valid when a long-named option has been found by the most
373: recent call.
374:
375: If LONG_ONLY is nonzero, '-' as well as '--' can introduce
376: long-named options. */
377:
378: int
379: _getopt_internal (argc, argv, optstring, longopts, longind, long_only)
380: int argc;
381: char *const *argv;
382: const char *optstring;
383: const struct option *longopts;
384: int *longind;
385: int long_only;
386: {
387: optarg = NULL;
388:
389: if (optind == 0)
390: {
391: optstring = _getopt_initialize (optstring);
392: optind = 1; /* Don't scan ARGV[0], the program name. */
393: }
394:
395: if (nextchar == NULL || *nextchar == '\0')
396: {
397: /* Advance to the next ARGV-element. */
398:
399: if (ordering == PERMUTE)
400: {
401: /* If we have just processed some options following some non-options,
402: exchange them so that the options come first. */
403:
404: if (first_nonopt != last_nonopt && last_nonopt != optind)
405: exchange ((char **) argv);
406: else if (last_nonopt != optind)
407: first_nonopt = optind;
408:
409: /* Skip any additional non-options
410: and extend the range of non-options previously skipped. */
411:
412: while (optind < argc
413: && (argv[optind][0] != '-' || argv[optind][1] == '\0'))
414: optind++;
415: last_nonopt = optind;
416: }
417:
418: /* The special ARGV-element `--' means premature end of options.
419: Skip it like a null option,
420: then exchange with previous non-options as if it were an option,
421: then skip everything else like a non-option. */
422:
423: if (optind != argc && !strcmp (argv[optind], "--"))
424: {
425: optind++;
426:
427: if (first_nonopt != last_nonopt && last_nonopt != optind)
428: exchange ((char **) argv);
429: else if (first_nonopt == last_nonopt)
430: first_nonopt = optind;
431: last_nonopt = argc;
432:
433: optind = argc;
434: }
435:
436: /* If we have done all the ARGV-elements, stop the scan
437: and back over any non-options that we skipped and permuted. */
438:
439: if (optind == argc)
440: {
441: /* Set the next-arg-index to point at the non-options
442: that we previously skipped, so the caller will digest them. */
443: if (first_nonopt != last_nonopt)
444: optind = first_nonopt;
445: return EOF;
446: }
447:
448: /* If we have come to a non-option and did not permute it,
449: either stop the scan or describe it to the caller and pass it by. */
450:
451: if ((argv[optind][0] != '-' || argv[optind][1] == '\0'))
452: {
453: if (ordering == REQUIRE_ORDER)
454: return EOF;
455: optarg = argv[optind++];
456: return 1;
457: }
458:
459: /* We have found another option-ARGV-element.
460: Skip the initial punctuation. */
461:
462: nextchar = (argv[optind] + 1
463: + (longopts != NULL && argv[optind][1] == '-'));
464: }
465:
466: /* Decode the current option-ARGV-element. */
467:
468: /* Check whether the ARGV-element is a long option.
469:
470: If long_only and the ARGV-element has the form "-f", where f is
471: a valid short option, don't consider it an abbreviated form of
472: a long option that starts with f. Otherwise there would be no
473: way to give the -f short option.
474:
475: On the other hand, if there's a long option "fubar" and
476: the ARGV-element is "-fu", do consider that an abbreviation of
477: the long option, just like "--fu", and not "-f" with arg "u".
478:
479: This distinction seems to be the most useful approach. */
480:
481: if (longopts != NULL
482: && (argv[optind][1] == '-'
483: || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
484: {
485: char *nameend;
486: const struct option *p;
487: const struct option *pfound = NULL;
488: int exact = 0;
489: int ambig = 0;
490: int indfound = 0;
491: int option_index;
492:
493: for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
494: /* Do nothing. */ ;
495:
496: /* Test all long options for either exact match
497: or abbreviated matches. */
498: for (p = longopts, option_index = 0; p->name; p++, option_index++)
499: if (!strncmp (p->name, nextchar, nameend - nextchar))
500: {
501: if (nameend - nextchar == strlen (p->name))
502: {
503: /* Exact match found. */
504: pfound = p;
505: indfound = option_index;
506: exact = 1;
507: break;
508: }
509: else if (pfound == NULL)
510: {
511: /* First nonexact match found. */
512: pfound = p;
513: indfound = option_index;
514: }
515: else
516: /* Second or later nonexact match found. */
517: ambig = 1;
518: }
519:
520: if (ambig && !exact)
521: {
522: if (opterr)
523: fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
524: argv[0], argv[optind]);
525: nextchar += strlen (nextchar);
526: optind++;
527: return '?';
528: }
529:
530: if (pfound != NULL)
531: {
532: option_index = indfound;
533: optind++;
534: if (*nameend)
535: {
536: /* Don't test has_arg with >, because some C compilers don't
537: allow it to be used on enums. */
538: if (pfound->has_arg)
539: optarg = nameend + 1;
540: else
541: {
542: if (opterr) {
543: if (argv[optind - 1][1] == '-')
544: /* --option */
545: fprintf (stderr,
546: _("%s: option `--%s' doesn't allow an argument\n"),
547: argv[0], pfound->name);
548: else
549: /* +option or -option */
550: fprintf (stderr,
551: _("%s: option `%c%s' doesn't allow an argument\n"),
552: argv[0], argv[optind - 1][0], pfound->name);
553: }
554: nextchar += strlen (nextchar);
555: return '?';
556: }
557: }
558: else if (pfound->has_arg == 1)
559: {
560: if (optind < argc)
561: optarg = argv[optind++];
562: else
563: {
564: if (opterr)
565: fprintf (stderr,
566: _("%s: option `%s' requires an argument\n"),
567: argv[0], argv[optind - 1]);
568: nextchar += strlen (nextchar);
569: return optstring[0] == ':' ? ':' : '?';
570: }
571: }
572: nextchar += strlen (nextchar);
573: if (longind != NULL)
574: *longind = option_index;
575: if (pfound->flag)
576: {
577: *(pfound->flag) = pfound->val;
578: return 0;
579: }
580: return pfound->val;
581: }
582:
583: /* Can't find it as a long option. If this is not getopt_long_only,
584: or the option starts with '--' or is not a valid short
585: option, then it's an error.
586: Otherwise interpret it as a short option. */
587: if (!long_only || argv[optind][1] == '-'
588: || my_index (optstring, *nextchar) == NULL)
589: {
590: if (opterr)
591: {
592: if (argv[optind][1] == '-')
593: /* --option */
594: fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
595: argv[0], nextchar);
596: else
597: /* +option or -option */
598: fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
599: argv[0], argv[optind][0], nextchar);
600: }
601: nextchar = (char *) "";
602: optind++;
603: return '?';
604: }
605: }
606:
607: /* Look at and handle the next short option-character. */
608:
609: {
610: char c = *nextchar++;
611: char *temp = my_index (optstring, c);
612:
613: /* Increment `optind' when we start to process its last character. */
614: if (*nextchar == '\0')
615: ++optind;
616:
617: if (temp == NULL || c == ':')
618: {
619: if (opterr)
620: {
621: if (posixly_correct)
622: /* 1003.2 specifies the format of this message. */
623: fprintf (stderr, _("%s: illegal option -- %c\n"),
624: argv[0], c);
625: else
626: fprintf (stderr, _("%s: invalid option -- %c\n"),
627: argv[0], c);
628: }
629: optopt = c;
630: return '?';
631: }
632: if (temp[1] == ':')
633: {
634: if (temp[2] == ':')
635: {
636: /* This is an option that accepts an argument optionally. */
637: if (*nextchar != '\0')
638: {
639: optarg = nextchar;
640: optind++;
641: }
642: else
643: optarg = NULL;
644: nextchar = NULL;
645: }
646: else
647: {
648: /* This is an option that requires an argument. */
649: if (*nextchar != '\0')
650: {
651: optarg = nextchar;
652: /* If we end this ARGV-element by taking the rest as an arg,
653: we must advance to the next element now. */
654: optind++;
655: }
656: else if (optind == argc)
657: {
658: if (opterr)
659: {
660: /* 1003.2 specifies the format of this message. */
661: fprintf (stderr,
662: _("%s: option requires an argument -- %c\n"),
663: argv[0], c);
664: }
665: optopt = c;
666: if (optstring[0] == ':')
667: c = ':';
668: else
669: c = '?';
670: }
671: else
672: /* We already incremented `optind' once;
673: increment it again when taking next ARGV-elt as argument. */
674: optarg = argv[optind++];
675: nextchar = NULL;
676: }
677: }
678: return c;
679: }
680: }
681:
682: int
683: getopt (argc, argv, optstring)
684: int argc;
685: char *const *argv;
686: const char *optstring;
687: {
688: return _getopt_internal (argc, argv, optstring,
689: (const struct option *) 0,
690: (int *) 0,
691: 0);
692: }
693:
694: #endif /* _LIBC or not __GNU_LIBRARY__. */
695:
696: #ifdef TEST
697:
698: /* Compile with -DTEST to make an executable for use in testing
699: the above definition of `getopt'. */
700:
701: int
702: main (argc, argv)
703: int argc;
704: char **argv;
705: {
706: int c;
707: int digit_optind = 0;
708:
709: while (1)
710: {
711: int this_option_optind = optind ? optind : 1;
712:
713: c = getopt (argc, argv, "abc:d:0123456789");
714: if (c == EOF)
715: break;
716:
717: switch (c)
718: {
719: case '0':
720: case '1':
721: case '2':
722: case '3':
723: case '4':
724: case '5':
725: case '6':
726: case '7':
727: case '8':
728: case '9':
729: if (digit_optind != 0 && digit_optind != this_option_optind)
730: printf ("digits occur in two different argv-elements.\n");
731: digit_optind = this_option_optind;
732: printf ("option %c\n", c);
733: break;
734:
735: case 'a':
736: printf ("option a\n");
737: break;
738:
739: case 'b':
740: printf ("option b\n");
741: break;
742:
743: case 'c':
744: printf ("option c with value `%s'\n", optarg);
745: break;
746:
747: case '?':
748: break;
749:
750: default:
751: printf ("?? getopt returned character code 0%o ??\n", c);
752: }
753: }
754:
755: if (optind < argc)
756: {
757: printf ("non-option ARGV-elements: ");
758: while (optind < argc)
759: printf ("%s ", argv[optind++]);
760: printf ("\n");
761: }
762:
763: exit(EXIT_SUCCESS);
764: }
765:
766: #endif /* TEST */
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