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    1 /* Declarations for getopt.
    2    Copyright (C) 1989, 90, 91, 92, 93, 94 Free Software Foundation, Inc.
    3 
    4 This file is part of the GNU C Library.  Its master source is NOT part of
    5 the C library, however.  The master source lives in /gd/gnu/lib.
    6 
    7 The GNU C Library is free software; you can redistribute it and/or
    8 modify it under the terms of the GNU Library General Public License as
    9 published by the Free Software Foundation; either version 2 of the
   10 License, or (at your option) any later version.
   11 
   12 The GNU C Library is distributed in the hope that it will be useful,
   13 but WITHOUT ANY WARRANTY; without even the implied warranty of
   14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   15 Library General Public License for more details.
   16 
   17 You should have received a copy of the GNU Library General Public
   18 License along with the GNU C Library; see the file COPYING.LIB.  If
   19 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
   20 Cambridge, MA 02139, USA.  */
   21 
   22 #ifndef _GETOPT_H
   23 #define _GETOPT_H 1
   24 
   25 #ifdef  __cplusplus
   26 extern "C" {
   27 #endif
   28 
   29 /* For communication from `getopt' to the caller.
   30    When `getopt' finds an option that takes an argument,
   31    the argument value is returned here.
   32    Also, when `ordering' is RETURN_IN_ORDER,
   33    each non-option ARGV-element is returned here.  */
   34 
   35 extern char *optarg;
   36 
   37 /* Index in ARGV of the next element to be scanned.
   38    This is used for communication to and from the caller
   39    and for communication between successive calls to `getopt'.
   40 
   41    On entry to `getopt', zero means this is the first call; initialize.
   42 
   43    When `getopt' returns EOF, this is the index of the first of the
   44    non-option elements that the caller should itself scan.
   45 
   46    Otherwise, `optind' communicates from one call to the next
   47    how much of ARGV has been scanned so far.  */
   48 
   49 extern int optind;
   50 
   51 /* Callers store zero here to inhibit the error message `getopt' prints
   52    for unrecognized options.  */
   53 
   54 extern int opterr;
   55 
   56 /* Set to an option character which was unrecognized.  */
   57 
   58 extern int optopt;
   59 
   60 /* Describe the long-named options requested by the application.
   61    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
   62    of `struct option' terminated by an element containing a name which is
   63    zero.
   64 
   65    The field `has_arg' is:
   66    no_argument      (or 0) if the option does not take an argument,
   67    required_argument    (or 1) if the option requires an argument,
   68    optional_argument    (or 2) if the option takes an optional argument.
   69 
   70    If the field `flag' is not NULL, it points to a variable that is set
   71    to the value given in the field `val' when the option is found, but
   72    left unchanged if the option is not found.
   73 
   74    To have a long-named option do something other than set an `int' to
   75    a compiled-in constant, such as set a value from `optarg', set the
   76    option's `flag' field to zero and its `val' field to a nonzero
   77    value (the equivalent single-letter option character, if there is
   78    one).  For long options that have a zero `flag' field, `getopt'
   79    returns the contents of the `val' field.  */
   80 
   81 struct option
   82 {
   83 #if defined (__STDC__) && __STDC__ || defined(__cplusplus)
   84   const char *name;
   85 #else
   86   char *name;
   87 #endif
   88   /* has_arg can't be an enum because some compilers complain about
   89      type mismatches in all the code that assumes it is an int.  */
   90   int has_arg;
   91   int *flag;
   92   int val;
   93 };
   94 
   95 /* Names for the values of the `has_arg' field of `struct option'.  */
   96 
   97 #define no_argument     0
   98 #define required_argument   1
   99 #define optional_argument   2
  100 
  101 #if ( defined (__STDC__) && __STDC__ ) || defined(__cplusplus) || defined(MSDOS)
  102 #ifdef __EMX__
  103 int getopt (int, char **, __const__ char *);
  104 #elif defined( __GNU_LIBRARY__)
  105 /* Many other libraries have conflicting prototypes for getopt, with
  106    differences in the consts, in stdlib.h.  To avoid compilation
  107    errors, only prototype getopt for the GNU C library.  */
  108 extern int getopt (int argc, char *const *argv, const char *shortopts);
  109 #else /* not __GNU_LIBRARY__ */
  110 extern int getopt (int argc, char *const *argv, const char *optstring);
  111 #endif /* __GNU_LIBRARY__ */
  112 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
  113             const struct option *longopts, int *longind);
  114 extern int getopt_long_only (int argc, char *const *argv,
  115                  const char *shortopts,
  116                  const struct option *longopts, int *longind);
  117 
  118 /* Internal only.  Users should not call this directly.  */
  119 extern int _getopt_internal (int argc, char *const *argv,
  120                  const char *shortopts,
  121                  const struct option *longopts, int *longind,
  122                  int long_only);
  123 #else /* not __STDC__ */
  124 extern int getopt ();
  125 extern int getopt_long ();
  126 extern int getopt_long_only ();
  127 
  128 extern int _getopt_internal ();
  129 #endif /* __STDC__ */
  130 
  131 #ifdef  __cplusplus
  132 }
  133 #endif
  134 
  135 #endif /* _GETOPT_H */