/* Getopt for GNU.   NOTE: getopt is now part of the C library, so if you don't know what   "Keep this file name-space clean" means, talk to roland@gnu.ai.mit.edu   before changing it!   Copyright (C) 1987, 88, 89, 90, 91, 92, 93, 94    Free Software Foundation, Inc.   This program is free software; you can redistribute it and/or modify it   it under the terms of the GNU General Public License Version 2 as   published by the Free Software Foundation.  You may not use, modify or   distribute this program under any other version of the GNU General   Public License.   This program is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   GNU General Public License for more details.  *//* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.   Ditto for AIX 3.2 and <stdlib.h>.  */#ifndef _NO_PROTO#define _NO_PROTO#endif#include <stdio.h>#ifdef HAVE_CONFIG_H#if defined (emacs) || defined (CONFIG_BROKETS)/* We use <config.h> instead of "config.h" so that a compilation   using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h   (which it would do because it found this file in $srcdir).  */#include <config.h>#else#include "config.h"#endif#endif#ifndef __STDC__/* This is a separate conditional since some stdc systems   reject `defined (const)'.  */#ifndef const#define const#endif#endif#ifdef HAVE_STRING_H#include <string.h>#endif/* Comment out all this code if we are using the GNU C Library, and are not   actually compiling the library itself.  This code is part of the GNU C   Library, but also included in many other GNU distributions.  Compiling   and linking in this code is a waste when using the GNU C library   (especially if it is a shared library).  Rather than having every GNU   program understand `configure --with-gnu-libc' and omit the object files,   it is simpler to just do this in the source for each such file.  */#if defined (_LIBC) || !defined (__GNU_LIBRARY__)/* This needs to come after some library #include   to get __GNU_LIBRARY__ defined.  */#ifdef  __GNU_LIBRARY__/* Don't include stdlib.h for non-GNU C libraries because some of them   contain conflicting prototypes for getopt.  */#include <stdlib.h>#endif  /* GNU C library.  *//* This version of `getopt' appears to the caller like standard Unix `getopt'   but it behaves differently for the user, since it allows the user   to intersperse the options with the other arguments.   As `getopt' works, it permutes the elements of ARGV so that,   when it is done, all the options precede everything else.  Thus   all application programs are extended to handle flexible argument order.   Setting the environment variable POSIXLY_CORRECT disables permutation.   Then the behavior is completely standard.   GNU application programs can use a third alternative mode in which   they can distinguish the relative order of options and other arguments.  */#include "getopt1.h"/* For communication from `getopt' to the caller.   When `getopt' finds an option that takes an argument,   the argument value is returned here.   Also, when `ordering' is RETURN_IN_ORDER,   each non-option ARGV-element is returned here.  */char *optarg = NULL;/* Index in ARGV of the next element to be scanned.   This is used for communication to and from the caller   and for communication between successive calls to `getopt'.   On entry to `getopt', zero means this is the first call; initialize.   When `getopt' returns EOF, this is the index of the first of the   non-option elements that the caller should itself scan.   Otherwise, `optind' communicates from one call to the next   how much of ARGV has been scanned so far.  *//* XXX 1003.2 says this must be 1 before any call.  */int optind = 0;/* The next char to be scanned in the option-element   in which the last option character we returned was found.   This allows us to pick up the scan where we left off.   If this is zero, or a null string, it means resume the scan   by advancing to the next ARGV-element.  */static char *nextchar;/* Callers store zero here to inhibit the error message   for unrecognized options.  */int opterr = 1;/* Set to an option character which was unrecognized.   This must be initialized on some systems to avoid linking in the   system's own getopt implementation.  */int optopt = '?';/* Describe how to deal with options that follow non-option ARGV-elements.   If the caller did not specify anything,   the default is REQUIRE_ORDER if the environment variable   POSIXLY_CORRECT is defined, PERMUTE otherwise.   REQUIRE_ORDER means don't recognize them as options;   stop option processing when the first non-option is seen.   This is what Unix does.   This mode of operation is selected by either setting the environment   variable POSIXLY_CORRECT, or using `+' as the first character   of the list of option characters.   PERMUTE is the default.  We permute the contents of ARGV as we scan,   so that eventually all the non-options are at the end.  This allows options   to be given in any order, even with programs that were not written to   expect this.   RETURN_IN_ORDER is an option available to programs that were written   to expect options and other ARGV-elements in any order and that care about   the ordering of the two.  We describe each non-option ARGV-element   as if it were the argument of an option with character code 1.   Using `-' as the first character of the list of option characters   selects this mode of operation.   The special argument `--' forces an end of option-scanning regardless   of the value of `ordering'.  In the case of RETURN_IN_ORDER, only   `--' can cause `getopt' to return EOF with `optind' != ARGC.  */static enum{  REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER} ordering;/* Value of POSIXLY_CORRECT environment variable.  */static char *posixly_correct;#ifdef  __GNU_LIBRARY__/* We want to avoid inclusion of string.h with non-GNU libraries   because there are many ways it can cause trouble.   On some systems, it contains special magic macros that don't work   in GCC.  */#include <string.h>#define my_index    strchr#else/* Avoid depending on library functions or files   whose names are inconsistent.  */#if !defined(_WIN32) char *getenv ();#endifstatic char *my_index (str, chr)     const char *str;     int chr;{  while (*str)    {      if (*str == chr)    return (char *) str;      str++;    }  return 0;}/* If using GCC, we can safely declare strlen this way.   If not using GCC, it is ok not to declare it.  */#ifdef __GNUC__/* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.   That was relevant to code that was here before.  */#ifndef __STDC__/* gcc with -traditional declares the built-in strlen to return int,   and has done so at least since version 2.4.5. -- rms.  */extern int strlen (const char *);#endif /* not __STDC__ */#endif /* __GNUC__ */#endif /* not __GNU_LIBRARY__ *//* Handle permutation of arguments.  *//* Describe the part of ARGV that contains non-options that have   been skipped.  `first_nonopt' is the index in ARGV of the first of them;   `last_nonopt' is the index after the last of them.  */static int first_nonopt;static int last_nonopt;/* Exchange two adjacent subsequences of ARGV.   One subsequence is elements [first_nonopt,last_nonopt)   which contains all the non-options that have been skipped so far.   The other is elements [last_nonopt,optind), which contains all   the options processed since those non-options were skipped.   `first_nonopt' and `last_nonopt' are relocated so that they describe   the new indices of the non-options in ARGV after they are moved.  */static voidexchange (argv)     char **argv;{    int bottom = first_nonopt;    int middle = last_nonopt;    int top = optind;    char *tem;        /* Exchange the shorter segment with the far end of the longer segment.       That puts the shorter segment into the right place.       It leaves the longer segment in the right place overall,       but it consists of two parts that need to be swapped next.  */        while (top > middle && middle > bottom)    {        if (top - middle > middle - bottom)        {            /* Bottom segment is the short one.  */            int len = middle - bottom;            register int i;                        /* Swap it with the top part of the top segment.  */            for (i = 0; i < len; i++)            {                tem = argv[bottom + i];                argv[bottom + i] = argv[top - (middle - bottom) + i];                argv[top - (middle - bottom) + i] = tem;            }            /* Exclude the moved bottom segment from further swapping.  */            top -= len;        }        else        {            /* Top segment is the short one.  */            int len = top - middle;            register int i;                        /* Swap it with the bottom part of the bottom segment.  */            for (i = 0; i < len; i++)            {                tem = argv[bottom + i];                argv[bottom + i] = argv[middle + i];                argv[middle + i] = tem;            }            /* Exclude the moved top segment from further swapping.  */            bottom += len;        }    }        /* Update records for the slots the non-options now occupy.  */        first_nonopt += (optind - last_nonopt);    last_nonopt = optind;}/* Initialize the internal data when the first call is made.  */static const char *_getopt_initialize (optstring)     const char *optstring;{    /* Start processing options with ARGV-element 1 (since ARGV-element 0       is the program name); the sequence of previously skipped       non-option ARGV-elements is empty.  */        first_nonopt = last_nonopt = optind = 1;        nextchar = NULL;        posixly_correct = getenv ("POSIXLY_CORRECT");        /* Determine how to handle the ordering of options and nonoptions.  */        if (optstring[0] == '-')    {        ordering = RETURN_IN_ORDER;        ++optstring;    }    else if (optstring[0] == '+')    {        ordering = REQUIRE_ORDER;        ++optstring;    }    else if (posixly_correct != NULL)        ordering = REQUIRE_ORDER;    else        ordering = PERMUTE;        return optstring;}/* Scan elements of ARGV (whose length is ARGC) for option characters   given in OPTSTRING.   If an element of ARGV starts with '-', and is not exactly "-" or "--",   then it is an option element.  The characters of this element   (aside from the initial '-') are option characters.  If `getopt'   is called repeatedly, it returns successively each of the option characters   from each of the option elements.   If `getopt' finds another option character, it returns that character,   updating `optind' and `nextchar' so that the next call to `getopt' can   resume the scan with the following option character or ARGV-element.   If there are no more option characters, `getopt' returns `EOF'.   Then `optind' is the index in ARGV of the first ARGV-element   that is not an option.  (The ARGV-elements have been permuted   so that those that are not options now come last.)   OPTSTRING is a string containing the legitimate option characters.   If an option character is seen that is not listed in OPTSTRING,   return '?' after printing an error message.  If you set `opterr' to   zero, the error message is suppressed but we still return '?'.   If a char in OPTSTRING is followed by a colon, that means it wants an arg,   so the following text in the same ARGV-element, or the text of the following   ARGV-element, is returned in `optarg'.  Two colons mean an option that   wants an optional arg; if there is text in the current ARGV-element,   it is returned in `optarg', otherwise `optarg' is set to zero.   If OPTSTRING starts with `-' or `+', it requests different methods of   handling the non-option ARGV-elements.   See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.   Long-named options begin with `--' instead of `-'.   Their names may be abbreviated as long as the abbreviation is unique   or is an exact match for some defined option.  If they have an   argument, it follows the option name in the same ARGV-element, separated   from the option name by a `=', or else the in next ARGV-element.   When `getopt' finds a long-named option, it returns 0 if that option's   `flag' field is nonzero, the value of the option's `val' field   if the `flag' field is zero.