getopt_long.c

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   The elements of ARGV aren't really const, because we permute them.
   But we pretend they're const in the prototype to be compatible
   with other systems.

   LONGOPTS is a vector of `struct option' terminated by an
   element containing a name which is zero.

   LONGIND returns the index in LONGOPT of the long-named option found.
   It is only valid when a long-named option has been found by the most
   recent call.

   If LONG_ONLY is nonzero, '-' as well as '--' can introduce
   long-named options.  */

int
_getopt_internal (argc, argv, optstring, longopts, longind, long_only)
     int argc;
     char *const *argv;
     const char *optstring;
     const struct option *longopts;
     int *longind;
     int long_only;
{
    optarg = NULL;
    
    if (optind == 0)
        optstring = _getopt_initialize (optstring);
    
    if (nextchar == NULL || *nextchar == '\0')
    {
        /* Advance to the next ARGV-element.  */
        if (ordering == PERMUTE)
        {
            /* If we have just processed some options following some non-options,
               exchange them so that the options come first.  */
            
            if (first_nonopt != last_nonopt && last_nonopt != optind)
                exchange ((char **) argv);
            else if (last_nonopt != optind)
                first_nonopt = optind;
            
            /* Skip any additional non-options
               and extend the range of non-options previously skipped.  */
            while (optind < argc
                && (argv[optind][0] != '-' || argv[optind][1] == '\0'))
                optind++;
            last_nonopt = optind;
        }
        
        /* The special ARGV-element `--' means premature end of options.
           Skip it like a null option,
           then exchange with previous non-options as if it were an option,
           then skip everything else like a non-option.  */
        if (optind != argc && !strcmp (argv[optind], "--"))
        {
            optind++;
            
            if (first_nonopt != last_nonopt && last_nonopt != optind)
                exchange ((char **) argv);
            else if (first_nonopt == last_nonopt)
                first_nonopt = optind;
            last_nonopt = argc;
            
            optind = argc;
        }
        
        /* If we have done all the ARGV-elements, stop the scan
           and back over any non-options that we skipped and permuted.  */
        if (optind == argc)
        {
            /* Set the next-arg-index to point at the non-options
               that we previously skipped, so the caller will digest them.  */
            if (first_nonopt != last_nonopt)
                optind = first_nonopt;
            return EOF;
        }
        
        /* If we have come to a non-option and did not permute it,
           either stop the scan or describe it to the caller and pass it by.  */
        if ((argv[optind][0] != '-' || argv[optind][1] == '\0'))
        {
            if (ordering == REQUIRE_ORDER)
                return EOF;
            optarg = argv[optind++];
            return 1;
        }
        
        /* We have found another option-ARGV-element.
           Skip the initial punctuation.  */
        nextchar = (argv[optind] + 1
            + (longopts != NULL && argv[optind][1] == '-'));
    }
    
    /* Decode the current option-ARGV-element.  */
    
    /* Check whether the ARGV-element is a long option.
    
       If long_only and the ARGV-element has the form "-f", where f is
       a valid short option, don't consider it an abbreviated form of
       a long option that starts with f.  Otherwise there would be no
       way to give the -f short option.
     
       On the other hand, if there's a long option "fubar" and
       the ARGV-element is "-fu", do consider that an abbreviation of
       the long option, just like "--fu", and not "-f" with arg "u".
      
       This distinction seems to be the most useful approach.  */
    if (longopts != NULL
        && (argv[optind][1] == '-'
        || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
    {
        char *nameend;
        const struct option *p;
        const struct option *pfound = NULL;
        int exact = 0;
        int ambig = 0;
        int indfound;
        int option_index;
        
        for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
            /* Do nothing.  */ ;
            
        /* Test all long options for either exact match
           or abbreviated matches.  */
        for (p = longopts, option_index = 0; p->name; p++, option_index++)
            if (!strncmp (p->name, nextchar, nameend - nextchar))
            {
                if (nameend - nextchar == (int) strlen (p->name))
                {
                    /* Exact match found.  */
                    pfound = p;
                    indfound = option_index;
                    exact = 1;
                    break;
                }
                else if (pfound == NULL)
                {
                    /* First nonexact match found.  */
                    pfound = p;
                    indfound = option_index;
                }
                else
                    /* Second or later nonexact match found.  */
                    ambig = 1;
            }
                
        if (ambig && !exact)
        {
            if (opterr)
                fprintf (stderr, "%s: option `%s' is ambiguous\n",
                argv[0], argv[optind]);
            nextchar += strlen (nextchar);
            optind++;
            return '?';
        }
        
        if (pfound != NULL)
        {
            option_index = indfound;
            optind++;
            if (*nameend)
            {
                /* Don't test has_arg with >, because some C compilers don't
                   allow it to be used on enums.  */
                if (pfound->has_arg)
                    optarg = nameend + 1;
                else
                {
                    if (opterr)
                    {
                        if (argv[optind - 1][1] == '-')
                            /* --option */
                            fprintf (stderr,
                            "%s: option `--%s' doesn't allow an argument\n",
                            argv[0], pfound->name);
                        else
                            /* +option or -option */
                            fprintf (stderr,
                            "%s: option `%c%s' doesn't allow an argument\n",
                            argv[0], argv[optind - 1][0], pfound->name);
                    }
                    nextchar += strlen (nextchar);
                    return '?';
                }
            }
            else if (pfound->has_arg == 1)
            {
                if (optind < argc)
                    optarg = argv[optind++];
                else
                {
                    if (opterr)
                        fprintf (stderr, "%s: option `%s' requires an argument\n",
                        argv[0], argv[optind - 1]);
                    nextchar += strlen (nextchar);
                    return optstring[0] == ':' ? ':' : '?';
                }
            }

            nextchar += strlen (nextchar);
            if (longind != NULL)
                *longind = option_index;
            if (pfound->flag)
            {
                *(pfound->flag) = pfound->val;
                return 0;
            }
            return pfound->val;
        }
                
        /* Can't find it as a long option.  If this is not getopt_long_only,
           or the option starts with '--' or is not a valid short
           option, then it's an error.
           Otherwise interpret it as a short option.  */
        if (!long_only || argv[optind][1] == '-'
            || my_index (optstring, *nextchar) == NULL)
        {
            if (opterr)
            {
                if (argv[optind][1] == '-')
                    /* --option */
                    fprintf (stderr, "%s: unrecognized option `--%s'\n",
                    argv[0], nextchar);
                else
                    /* +option or -option */
                    fprintf (stderr, "%s: unrecognized option `%c%s'\n",
                    argv[0], argv[optind][0], nextchar);
            }
            nextchar = (char *) "";
            optind++;
            return '?';
        }
    }
    
    /* Look at and handle the next short option-character.  */
    {
        char c = *nextchar++;
        char *temp = my_index (optstring, c);
        
        /* Increment `optind' when we start to process its last character.  */
        if (*nextchar == '\0')
            ++optind;
        
        if (temp == NULL || c == ':')
        {
            if (opterr)
            {
                if (posixly_correct)
                    /* 1003.2 specifies the format of this message.  */
                    fprintf (stderr, "%s: illegal option -- %c\n", argv[0], c);
                else
                    fprintf (stderr, "%s: invalid option -- %c\n", argv[0], c);
            }
            optopt = c;
            return '?';
        }
        if (temp[1] == ':')
        {
            if (temp[2] == ':')
            {
                /* This is an option that accepts an argument optionally.  */
                if (*nextchar != '\0')
                {
                    optarg = nextchar;
                    optind++;
                }
                else
                    optarg = NULL;
                nextchar = NULL;
            }
            else
            {
                /* This is an option that requires an argument.  */
                if (*nextchar != '\0')
                {
                    optarg = nextchar;
                    /* If we end this ARGV-element by taking the rest as an arg,
                       we must advance to the next element now.  */
                    optind++;
                }
                else if (optind == argc)
                {
                    if (opterr)
                    {
                        /* 1003.2 specifies the format of this message.  */
                        fprintf (stderr, "%s: option requires an argument -- %c\n",
                            argv[0], c);
                    }
                    optopt = c;
                    if (optstring[0] == ':')
                        c = ':';
                    else
                        c = '?';
                }
                else
                    /* We already incremented `optind' once;
                       increment it again when taking next ARGV-elt as argument.  */
                    optarg = argv[optind++];
                nextchar = NULL;
            }
        }
        return c;
    }
}


int
getopt (argc, argv, optstring)
     int argc;
     char *const *argv;
     const char *optstring;
{
  return _getopt_internal (argc, argv, optstring,
               (const struct option *) 0,
               (int *) 0,
               0);
}

/* getopt_long and getopt_long_only entry points for GNU getopt.
   Copyright (C) 1987, 88, 89, 90, 91, 92, 1993
    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.  */

int
getopt_long (argc, argv, options, long_options, opt_index)
     int argc;
     char *const *argv;
     const char *options;
     const struct option *long_options;
     int *opt_index;
{
  return _getopt_internal (argc, argv, options, long_options, opt_index, 0);
}

/* Like getopt_long, but '-' as well as '--' can indicate a long option.
   If an option that starts with '-' (not '--') doesn't match a long option,
   but does match a short option, it is parsed as a short option
   instead.  */

int
getopt_long_only (argc, argv, options, long_options, opt_index)
     int argc;
     char *const *argv;
     const char *options;
     const struct option *long_options;
     int *opt_index;
{
  return _getopt_internal (argc, argv, options, long_options, opt_index, 1);
}


#endif  /* _LIBC or not __GNU_LIBRARY__.  */