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    1: /* Declarations for getopt.
    2:    Copyright (C) 1989-1994,1996-1999,2001,2003,2004
    3:    Free Software Foundation, Inc.
    4:    This file is part of the GNU C Library.
    5: 
    6:    The GNU C Library is free software; you can redistribute it and/or
    7:    modify it under the terms of the GNU Lesser General Public
    8:    License as published by the Free Software Foundation version 2.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #ifndef _GETOPT_H
   21: 
   22: #ifndef __need_getopt
   23: #define _GETOPT_H 1
   24: #endif
   25: 
   26: /* If __GNU_LIBRARY__ is not already defined, either we are being used
   27:    standalone, or this is the first header included in the source file.
   28:    If we are being used with glibc, we need to include <features.h>, but
   29:    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
   30:    not defined, include <ctype.h>, which will pull in <features.h> for us
   31:    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
   32:    doesn't flood the namespace with stuff the way some other headers do.)  */
   33: #if !defined __GNU_LIBRARY__
   34: # include <ctype.h>
   35: #endif
   36: 
   37: #ifndef __THROW
   38: # ifndef __GNUC_PREREQ
   39: #  define __GNUC_PREREQ(maj, min) (0)
   40: # endif
   41: # if defined __cplusplus && __GNUC_PREREQ (2,8)
   42: #  define __THROW	throw ()
   43: # else
   44: #  define __THROW
   45: # endif
   46: #endif
   47: 
   48: #ifdef	__cplusplus
   49: extern "C" {
   50: #endif
   51: 
   52: /* For communication from `getopt' to the caller.
   53:    When `getopt' finds an option that takes an argument,
   54:    the argument value is returned here.
   55:    Also, when `ordering' is RETURN_IN_ORDER,
   56:    each non-option ARGV-element is returned here.  */
   57: 
   58: extern char *optarg;
   59: 
   60: /* Index in ARGV of the next element to be scanned.
   61:    This is used for communication to and from the caller
   62:    and for communication between successive calls to `getopt'.
   63: 
   64:    On entry to `getopt', zero means this is the first call; initialize.
   65: 
   66:    When `getopt' returns -1, this is the index of the first of the
   67:    non-option elements that the caller should itself scan.
   68: 
   69:    Otherwise, `optind' communicates from one call to the next
   70:    how much of ARGV has been scanned so far.  */
   71: 
   72: extern int optind;
   73: 
   74: /* Callers store zero here to inhibit the error message `getopt' prints
   75:    for unrecognized options.  */
   76: 
   77: extern int opterr;
   78: 
   79: /* Set to an option character which was unrecognized.  */
   80: 
   81: extern int optopt;
   82: 
   83: #ifndef __need_getopt
   84: /* Describe the long-named options requested by the application.
   85:    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
   86:    of `struct option' terminated by an element containing a name which is
   87:    zero.
   88: 
   89:    The field `has_arg' is:
   90:    no_argument		(or 0) if the option does not take an argument,
   91:    required_argument	(or 1) if the option requires an argument,
   92:    optional_argument 	(or 2) if the option takes an optional argument.
   93: 
   94:    If the field `flag' is not NULL, it points to a variable that is set
   95:    to the value given in the field `val' when the option is found, but
   96:    left unchanged if the option is not found.
   97: 
   98:    To have a long-named option do something other than set an `int' to
   99:    a compiled-in constant, such as set a value from `optarg', set the
  100:    option's `flag' field to zero and its `val' field to a nonzero
  101:    value (the equivalent single-letter option character, if there is
  102:    one).  For long options that have a zero `flag' field, `getopt'
  103:    returns the contents of the `val' field.  */
  104: 
  105: struct option
  106: {
  107:   const char *name;
  108:   /* has_arg can't be an enum because some compilers complain about
  109:      type mismatches in all the code that assumes it is an int.  */
  110:   int has_arg;
  111:   int *flag;
  112:   int val;
  113: };
  114: 
  115: /* Names for the values of the `has_arg' field of `struct option'.  */
  116: 
  117: #define	no_argument		0
  118: #define required_argument	1
  119: #define optional_argument	2
  120: #endif	/* need getopt */
  121: 
  122: 
  123: /* Get definitions and prototypes for functions to process the
  124:    arguments in ARGV (ARGC of them, minus the program name) for
  125:    options given in OPTS.
  126: 
  127:    Return the option character from OPTS just read.  Return -1 when
  128:    there are no more options.  For unrecognized options, or options
  129:    missing arguments, `optopt' is set to the option letter, and '?' is
  130:    returned.
  131: 
  132:    The OPTS string is a list of characters which are recognized option
  133:    letters, optionally followed by colons, specifying that that letter
  134:    takes an argument, to be placed in `optarg'.
  135: 
  136:    If a letter in OPTS is followed by two colons, its argument is
  137:    optional.  This behavior is specific to the GNU `getopt'.
  138: 
  139:    The argument `--' causes premature termination of argument
  140:    scanning, explicitly telling `getopt' that there are no more
  141:    options.
  142: 
  143:    If OPTS begins with `--', then non-option arguments are treated as
  144:    arguments to the option '\0'.  This behavior is specific to the GNU
  145:    `getopt'.  */
  146: 
  147: #ifdef __GNU_LIBRARY__
  148: /* Many other libraries have conflicting prototypes for getopt, with
  149:    differences in the consts, in stdlib.h.  To avoid compilation
  150:    errors, only prototype getopt for the GNU C library.  */
  151: extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
  152:        __THROW;
  153: #else /* not __GNU_LIBRARY__ */
  154: extern int getopt ();
  155: #endif /* __GNU_LIBRARY__ */
  156: 
  157: #ifndef __need_getopt
  158: extern int getopt_long (int ___argc, char *const *___argv,
  159: 			const char *__shortopts,
  160: 		        const struct option *__longopts, int *__longind)
  161:        __THROW;
  162: extern int getopt_long_only (int ___argc, char *const *___argv,
  163: 			     const char *__shortopts,
  164: 		             const struct option *__longopts, int *__longind)
  165:        __THROW;
  166: 
  167: #endif
  168: 
  169: #ifdef	__cplusplus
  170: }
  171: #endif
  172: 
  173: /* Make sure we later can get all the definitions and declarations.  */
  174: #undef __need_getopt
  175: 
  176: #endif /* getopt.h */