4 * This file is a part of the revinetd project
6 * Revinetd is copyright (c) 2003-2008 by Steven M. Gill
7 * and distributed under the GPL.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
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.
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, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
29 NOTE: getopt is now part of the C library, so if you don't know what
30 "Keep this file name-space clean" means, talk to roland@gnu.ai.mit.edu
33 Copyright (C) 1987, 88, 89, 90, 91, 92, 1993
34 Free Software Foundation, Inc.
36 This program is free software; you can redistribute it and/or modify it
37 under the terms of the GNU General Public License as published by the
38 Free Software Foundation; either version 2, or (at your option) any
41 This program is distributed in the hope that it will be useful,
42 but WITHOUT ANY WARRANTY; without even the implied warranty of
43 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
44 GNU General Public License for more details.
46 You should have received a copy of the GNU General Public License
47 along with this program; if not, write to the Free Software
48 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
52 /* NOTE!!! AIX requires this to be the first thing in the file.
53 Do not put ANYTHING before it! */
57 #endif /* HAVE_CONFIG_H */
60 #if !__STDC__ && !defined(const) && IN_GCC
64 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>. */
76 /* Comment out all this code if we are using the GNU C Library, and are not
77 actually compiling the library itself. This code is part of the GNU C
78 Library, but also included in many other GNU distributions. Compiling
79 and linking in this code is a waste when using the GNU C library
80 (especially if it is a shared library). Rather than having every GNU
81 program understand `configure --with-gnu-libc' and omit the object files,
82 it is simpler to just do this in the source for each such file. */
84 #if defined (_LIBC) || !defined (__GNU_LIBRARY__)
89 /* If GETOPT_COMPAT is defined, `+' as well as `--' can introduce a
90 long-named option. Because this is not POSIX.2 compliant, it is
92 /* #define GETOPT_COMPAT */
94 /* This version of `getopt' appears to the caller like standard Unix `getopt'
95 but it behaves differently for the user, since it allows the user
96 to intersperse the options with the other arguments.
98 As `getopt' works, it permutes the elements of ARGV so that,
99 when it is done, all the options precede everything else. Thus
100 all application programs are extended to handle flexible argument order.
102 Setting the environment variable POSIXLY_CORRECT disables permutation.
103 Then the behavior is completely standard.
105 GNU application programs can use a third alternative mode in which
106 they can distinguish the relative order of options and other arguments. */
110 /* For communication from `getopt' to the caller.
111 When `getopt' finds an option that takes an argument,
112 the argument value is returned here.
113 Also, when `ordering' is RETURN_IN_ORDER,
114 each non-option ARGV-element is returned here. */
118 /* Index in ARGV of the next element to be scanned.
119 This is used for communication to and from the caller
120 and for communication between successive calls to `getopt'.
122 On entry to `getopt', zero means this is the first call; initialize.
124 When `getopt' returns EOF, this is the index of the first of the
125 non-option elements that the caller should itself scan.
127 Otherwise, `optind' communicates from one call to the next
128 how much of ARGV has been scanned so far. */
130 /* XXX 1003.2 says this must be 1 before any call. */
133 /* The next char to be scanned in the option-element
134 in which the last option character we returned was found.
135 This allows us to pick up the scan where we left off.
137 If this is zero, or a null string, it means resume the scan
138 by advancing to the next ARGV-element. */
140 static char *nextchar
;
142 /* Callers store zero here to inhibit the error message
143 for unrecognized options. */
147 /* Set to an option character which was unrecognized.
148 This must be initialized on some systems to avoid linking in the
149 system's own getopt implementation. */
153 /* Describe how to deal with options that follow non-option ARGV-elements.
155 If the caller did not specify anything,
156 the default is REQUIRE_ORDER if the environment variable
157 POSIXLY_CORRECT is defined, PERMUTE otherwise.
159 REQUIRE_ORDER means don't recognize them as options;
160 stop option processing when the first non-option is seen.
161 This is what Unix does.
162 This mode of operation is selected by either setting the environment
163 variable POSIXLY_CORRECT, or using `+' as the first character
164 of the list of option characters.
166 PERMUTE is the default. We permute the contents of ARGV as we scan,
167 so that eventually all the non-options are at the end. This allows options
168 to be given in any order, even with programs that were not written to
171 RETURN_IN_ORDER is an option available to programs that were written
172 to expect options and other ARGV-elements in any order and that care about
173 the ordering of the two. We describe each non-option ARGV-element
174 as if it were the argument of an option with character code 1.
175 Using `-' as the first character of the list of option characters
176 selects this mode of operation.
178 The special argument `--' forces an end of option-scanning regardless
179 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
180 `--' can cause `getopt' to return EOF with `optind' != ARGC. */
184 REQUIRE_ORDER
, PERMUTE
, RETURN_IN_ORDER
187 #ifdef __GNU_LIBRARY__
188 /* We want to avoid inclusion of string.h with non-GNU libraries
189 because there are many ways it can cause trouble.
190 On some systems, it contains special magic macros that don't work
193 #define my_index strchr
194 #define my_bcopy(src, dst, n) memcpy ((dst), (src), (n))
197 /* Avoid depending on library functions or files
198 whose names are inconsistent. */
203 my_index (const char *str
, int chr
)
215 my_bcopy (const char *from
, char *to
, int size
)
218 for (i
= 0; i
< size
; i
++)
221 #endif /* GNU C library. */
223 /* Handle permutation of arguments. */
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. */
229 static int first_nonopt
;
230 static int last_nonopt
;
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.
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. */
242 exchange (char **argv
)
244 int nonopts_size
= (last_nonopt
- first_nonopt
) * sizeof (char *);
245 char **temp
= (char **) malloc(nonopts_size
);
247 /* Interchange the two blocks of data in ARGV. */
249 my_bcopy ((char *) &argv
[first_nonopt
], (char *) temp
, nonopts_size
);
250 my_bcopy ((char *) &argv
[last_nonopt
], (char *) &argv
[first_nonopt
],
251 (optind
- last_nonopt
) * sizeof (char *));
252 my_bcopy ((char *) temp
,
253 (char *) &argv
[first_nonopt
+ optind
- last_nonopt
],
256 /* Update records for the slots the non-options now occupy. */
258 first_nonopt
+= (optind
- last_nonopt
);
259 last_nonopt
= optind
;
264 /* Scan elements of ARGV (whose length is ARGC) for option characters
267 If an element of ARGV starts with '-', and is not exactly "-" or "--",
268 then it is an option element. The characters of this element
269 (aside from the initial '-') are option characters. If `getopt'
270 is called repeatedly, it returns successively each of the option characters
271 from each of the option elements.
273 If `getopt' finds another option character, it returns that character,
274 updating `optind' and `nextchar' so that the next call to `getopt' can
275 resume the scan with the following option character or ARGV-element.
277 If there are no more option characters, `getopt' returns `EOF'.
278 Then `optind' is the index in ARGV of the first ARGV-element
279 that is not an option. (The ARGV-elements have been permuted
280 so that those that are not options now come last.)
282 OPTSTRING is a string containing the legitimate option characters.
283 If an option character is seen that is not listed in OPTSTRING,
284 return '?' after printing an error message. If you set `opterr' to
285 zero, the error message is suppressed but we still return '?'.
287 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
288 so the following text in the same ARGV-element, or the text of the following
289 ARGV-element, is returned in `optarg'. Two colons mean an option that
290 wants an optional arg; if there is text in the current ARGV-element,
291 it is returned in `optarg', otherwise `optarg' is set to zero.
293 If OPTSTRING starts with `-' or `+', it requests different methods of
294 handling the non-option ARGV-elements.
295 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
297 Long-named options begin with `--' instead of `-'.
298 Their names may be abbreviated as long as the abbreviation is unique
299 or is an exact match for some defined option. If they have an
300 argument, it follows the option name in the same ARGV-element, separated
301 from the option name by a `=', or else the in next ARGV-element.
302 When `getopt' finds a long-named option, it returns 0 if that option's
303 `flag' field is nonzero, the value of the option's `val' field
304 if the `flag' field is zero.
306 The elements of ARGV aren't really const, because we permute them.
307 But we pretend they're const in the prototype to be compatible
310 LONGOPTS is a vector of `struct option' terminated by an
311 element containing a name which is zero.
313 LONGIND returns the index in LONGOPT of the long-named option found.
314 It is only valid when a long-named option has been found by the most
317 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
318 long-named options. */
321 _getopt_internal (int argc
, char *const *argv
, const char *optstring
,
322 const struct option
*longopts
, int *longind
, int long_only
)
328 /* Initialize the internal data when the first call is made.
329 Start processing options with ARGV-element 1 (since ARGV-element 0
330 is the program name); the sequence of previously skipped
331 non-option ARGV-elements is empty. */
335 first_nonopt
= last_nonopt
= optind
= 1;
339 /* Determine how to handle the ordering of options and nonoptions. */
341 if (optstring
[0] == '-')
343 ordering
= RETURN_IN_ORDER
;
346 else if (optstring
[0] == '+')
348 ordering
= REQUIRE_ORDER
;
351 else if (getenv ("POSIXLY_CORRECT") != NULL
)
352 ordering
= REQUIRE_ORDER
;
357 if (nextchar
== NULL
|| *nextchar
== '\0')
359 if (ordering
== PERMUTE
)
361 /* If we have just processed some options following some non-options,
362 exchange them so that the options come first. */
364 if (first_nonopt
!= last_nonopt
&& last_nonopt
!= optind
)
365 exchange ((char **) argv
);
366 else if (last_nonopt
!= optind
)
367 first_nonopt
= optind
;
369 /* Now skip any additional non-options
370 and extend the range of non-options previously skipped. */
373 && (argv
[optind
][0] != '-' || argv
[optind
][1] == '\0')
376 || argv
[optind
][0] != '+' || argv
[optind
][1] == '\0')
377 #endif /* GETOPT_COMPAT */
380 last_nonopt
= optind
;
383 /* Special ARGV-element `--' means premature end of options.
384 Skip it like a null option,
385 then exchange with previous non-options as if it were an option,
386 then skip everything else like a non-option. */
388 if (optind
!= argc
&& !strcmp (argv
[optind
], "--"))
392 if (first_nonopt
!= last_nonopt
&& last_nonopt
!= optind
)
393 exchange ((char **) argv
);
394 else if (first_nonopt
== last_nonopt
)
395 first_nonopt
= optind
;
401 /* If we have done all the ARGV-elements, stop the scan
402 and back over any non-options that we skipped and permuted. */
406 /* Set the next-arg-index to point at the non-options
407 that we previously skipped, so the caller will digest them. */
408 if (first_nonopt
!= last_nonopt
)
409 optind
= first_nonopt
;
413 /* If we have come to a non-option and did not permute it,
414 either stop the scan or describe it to the caller and pass it by. */
416 if ((argv
[optind
][0] != '-' || argv
[optind
][1] == '\0')
419 || argv
[optind
][0] != '+' || argv
[optind
][1] == '\0')
420 #endif /* GETOPT_COMPAT */
423 if (ordering
== REQUIRE_ORDER
)
425 optarg
= argv
[optind
++];
429 /* We have found another option-ARGV-element.
430 Start decoding its characters. */
432 nextchar
= (argv
[optind
] + 1
433 + (longopts
!= NULL
&& argv
[optind
][1] == '-'));
437 && ((argv
[optind
][0] == '-'
438 && (argv
[optind
][1] == '-' || long_only
))
440 || argv
[optind
][0] == '+'
441 #endif /* GETOPT_COMPAT */
444 const struct option
*p
;
448 const struct option
*pfound
= NULL
;
451 indfound
= 0; /* To silence the compiler. */
453 while (*s
&& *s
!= '=')
456 /* Test all options for either exact match or abbreviated matches. */
457 for (p
= longopts
, option_index
= 0; p
->name
;
459 if (!strncmp (p
->name
, nextchar
, s
- nextchar
))
461 if (s
- nextchar
== strlen (p
->name
))
463 /* Exact match found. */
465 indfound
= option_index
;
469 else if (pfound
== NULL
)
471 /* First nonexact match found. */
473 indfound
= option_index
;
476 /* Second nonexact match found. */
483 fprintf (stderr
, "%s: option `%s' is ambiguous\n",
484 exec_name
, argv
[optind
]);
485 nextchar
+= strlen (nextchar
);
492 option_index
= indfound
;
496 /* Don't test has_arg with >, because some C compilers don't
497 allow it to be used on enums. */
504 if (argv
[optind
- 1][1] == '-')
507 "%s: option `--%s' doesn't allow an argument\n",
508 exec_name
, pfound
->name
);
510 /* +option or -option */
512 "%s: option `%c%s' doesn't allow an argument\n",
513 exec_name
, argv
[optind
- 1][0], pfound
->name
);
515 nextchar
+= strlen (nextchar
);
519 else if (pfound
->has_arg
== 1)
522 optarg
= argv
[optind
++];
527 "%s: option `%s' requires an argument\n",
528 exec_name
, argv
[optind
- 1]);
529 nextchar
+= strlen (nextchar
);
530 return optstring
[0] == ':' ? ':' : '?';
533 nextchar
+= strlen (nextchar
);
535 *longind
= option_index
;
538 *(pfound
->flag
) = pfound
->val
;
543 /* Can't find it as a long option. If this is not getopt_long_only,
544 or the option starts with '--' or is not a valid short
545 option, then it's an error.
546 Otherwise interpret it as a short option. */
547 if (!long_only
|| argv
[optind
][1] == '-'
549 || argv
[optind
][0] == '+'
550 #endif /* GETOPT_COMPAT */
551 || my_index (optstring
, *nextchar
) == NULL
)
555 if (argv
[optind
][1] == '-')
557 fprintf (stderr
, "%s: unrecognized option `--%s'\n",
558 exec_name
, nextchar
);
560 /* +option or -option */
561 fprintf (stderr
, "%s: unrecognized option `%c%s'\n",
562 exec_name
, argv
[optind
][0], nextchar
);
564 nextchar
= (char *) "";
570 /* Look at and handle the next option-character. */
573 char c
= *nextchar
++;
574 char *temp
= my_index (optstring
, c
);
576 /* Increment `optind' when we start to process its last character. */
577 if (*nextchar
== '\0')
580 if (temp
== NULL
|| c
== ':')
585 if (c
< 040 || c
>= 0177)
586 fprintf (stderr
, "%s: unrecognized option, character code 0%o\n",
589 fprintf (stderr
, "%s: unrecognized option `-%c'\n", exec_name
, c
);
591 /* 1003.2 specifies the format of this message. */
592 fprintf (stderr
, "%s: illegal option -- %c\n", exec_name
, c
);
602 /* This is an option that accepts an argument optionally. */
603 if (*nextchar
!= '\0')
614 /* This is an option that requires an argument. */
615 if (*nextchar
!= '\0')
618 /* If we end this ARGV-element by taking the rest as an arg,
619 we must advance to the next element now. */
622 else if (optind
== argc
)
627 fprintf (stderr
, "%s: option `-%c' requires an argument\n",
630 /* 1003.2 specifies the format of this message. */
631 fprintf (stderr
, "%s: option requires an argument -- %c\n",
636 if (optstring
[0] == ':')
642 /* We already incremented `optind' once;
643 increment it again when taking next ARGV-elt as argument. */
644 optarg
= argv
[optind
++];
652 /* Calls internal getopt function to enable long option names. */
654 getopt_long (int argc
, char *const *argv
, const char *shortopts
,
655 const struct option
*longopts
, int *longind
)
657 return _getopt_internal (argc
, argv
, shortopts
, longopts
, longind
, 0);
661 getopt (int argc
, char *const *argv
, const char *optstring
)
663 return _getopt_internal (argc
, argv
, optstring
,
664 (const struct option
*) 0,
669 #endif /* _LIBC or not __GNU_LIBRARY__. */
673 /* Compile with -DTEST to make an executable for use in testing
674 the above definition of `getopt'. */
682 int digit_optind
= 0;
686 int this_option_optind
= optind
? optind
: 1;
688 c
= getopt (argc
, argv
, "abc:d:0123456789");
704 if (digit_optind
!= 0 && digit_optind
!= this_option_optind
)
705 printf ("digits occur in two different argv-elements.\n");
706 digit_optind
= this_option_optind
;
707 printf ("option %c\n", c
);
711 printf ("option a\n");
715 printf ("option b\n");
719 printf ("option c with value `%s'\n", optarg
);
726 printf ("?? getopt returned character code 0%o ??\n", c
);
732 printf ("non-option ARGV-elements: ");
733 while (optind
< argc
)
734 printf ("%s ", argv
[optind
++]);