1

/* from http://www.pwilson.net/getopt.html */

     2

     3

/* getopt.h */

     4

/* Declarations for getopt.

     5

   Copyright (C) 1989-1994, 1996-1999, 2001 Free Software 

     6

   Foundation, Inc. This file is part of the GNU C Library.

     7

     8

   The GNU C Library is free software; you can redistribute 

     9

   it and/or modify it under the terms of the GNU Lesser 

    10

   General Public License as published by the Free Software 

    11

   Foundation; either version 2.1 of the License, or 

    12

   (at your option) any later version.

    13

    14

   The GNU C Library is distributed in the hope that it will 

    15

   be useful, but WITHOUT ANY WARRANTY; without even the 

    16

   implied warranty of MERCHANTABILITY or FITNESS FOR A 

    17

   PARTICULAR PURPOSE.  See the GNU Lesser General Public 

    18

   License for more details.

    19

    20

   You should have received a copy of the GNU Lesser General 

    21

   Public License along with the GNU C Library; if not, write 

    22

   to the Free Software Foundation, Inc., 59 Temple Place,

    23

   Suite 330, Boston, MA 02111-1307 USA.  */

    24

    25

    26

    27

    28

    29

#ifndef _GETOPT_H

    30

    31

#ifndef __need_getopt

    32

# define _GETOPT_H 1

    33

#endif

    34

    35

/* If __GNU_LIBRARY__ is not already defined, either we are being used

    36

   standalone, or this is the first header included in the source file.

    37

   If we are being used with glibc, we need to include <features.h>, but

    38

   that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is

    39

   not defined, include <ctype.h>, which will pull in <features.h> for us

    40

   if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it

    41

   doesn't flood the namespace with stuff the way some other headers do.)  */

    42

#if !defined __GNU_LIBRARY__

    43

# include <ctype.h>

    44

#endif

    45

    46

#ifdef  __cplusplus

    47

extern "C" {

    48

#endif

    49

    50

/* For communication from `getopt' to the caller.

    51

   When `getopt' finds an option that takes an argument,

    52

   the argument value is returned here.

    53

   Also, when `ordering' is RETURN_IN_ORDER,

    54

   each non-option ARGV-element is returned here.  */

    55

    56

extern char *optarg;

    57

    58

/* Index in ARGV of the next element to be scanned.

    59

   This is used for communication to and from the caller

    60

   and for communication between successive calls to `getopt'.

    61

    62

   On entry to `getopt', zero means this is the first call; initialize.

    63

    64

   When `getopt' returns -1, this is the index of the first of the

    65

   non-option elements that the caller should itself scan.

    66

    67

   Otherwise, `optind' communicates from one call to the next

    68

   how much of ARGV has been scanned so far.  */

    69

    70

extern int optind;

    71

    72

/* Callers store zero here to inhibit the error message `getopt' prints

    73

   for unrecognized options.  */

    74

    75

extern int opterr;

    76

    77

/* Set to an option character which was unrecognized.  */

    78

    79

extern int optopt;

    80

    81

#ifndef __need_getopt

    82

/* Describe the long-named options requested by the application.

    83

   The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector

    84

   of `struct option' terminated by an element containing a name which is

    85

   zero.

    86

    87

   The field `has_arg' is:

    88

   no_argument          (or 0) if the option does not take an argument,

    89

   required_argument    (or 1) if the option requires an argument,

    90

   optional_argument    (or 2) if the option takes an optional argument.

    91

    92

   If the field `flag' is not NULL, it points to a variable that is set

    93

   to the value given in the field `val' when the option is found, but

    94

   left unchanged if the option is not found.

    95

    96

   To have a long-named option do something other than set an `int' to

    97

   a compiled-in constant, such as set a value from `optarg', set the

    98

   option's `flag' field to zero and its `val' field to a nonzero

    99

   value (the equivalent single-letter option character, if there is

   100

   one).  For long options that have a zero `flag' field, `getopt'

   101

   returns the contents of the `val' field.  */

   102

   103

struct option

   104

{

   105

# if (defined __STDC__ && __STDC__) || defined __cplusplus

   106

  const char *name;

   107

# else

   108

  char *name;

   109

# endif

   110

  /* has_arg can't be an enum because some compilers complain about

   111

     type mismatches in all the code that assumes it is an int.  */

   112

  int has_arg;

   113

  int *flag;

   114

  int val;

   115

};

   116

   117

/* Names for the values of the `has_arg' field of `struct option'.  */

   118

   119

# define no_argument            0

   120

# define required_argument      1

   121

# define optional_argument      2

   122

#endif  /* need getopt */

   123

   124

   125

/* Get definitions and prototypes for functions to process the

   126

   arguments in ARGV (ARGC of them, minus the program name) for

   127

   options given in OPTS.

   128

   129

   Return the option character from OPTS just read.  Return -1 when

   130

   there are no more options.  For unrecognized options, or options

   131

   missing arguments, `optopt' is set to the option letter, and '?' is

   132

   returned.

   133

   134

   The OPTS string is a list of characters which are recognized option

   135

   letters, optionally followed by colons, specifying that that letter

   136

   takes an argument, to be placed in `optarg'.

   137

   138

   If a letter in OPTS is followed by two colons, its argument is

   139

   optional.  This behavior is specific to the GNU `getopt'.

   140

   141

   The argument `--' causes premature termination of argument

   142

   scanning, explicitly telling `getopt' that there are no more

   143

   options.

   144

   145

   If OPTS begins with `--', then non-option arguments are treated as

   146

   arguments to the option '\0'.  This behavior is specific to the GNU

   147

   `getopt'.  */

   148

   149

#if (defined __STDC__ && __STDC__) || defined __cplusplus

   150

# if (defined __GNU_LIBRARY__ || __CYGWIN__ || __MINGW32__)

   151

/* Many other libraries have conflicting prototypes for getopt, with

   152

   differences in the consts, in stdlib.h.  To avoid compilation

   153

   errors, only prototype getopt for the GNU C library.  */

   154

extern int getopt (int ___argc, char *const *___argv, const char *__shortopts);

   155

# else /* not __GNU_LIBRARY__ */

   156

extern int getopt ();

   157

# endif /* __GNU_LIBRARY__ */

   158

   159

# ifndef __need_getopt

   160

extern int getopt_long (int ___argc, char *const *___argv,

   161

                        const char *__shortopts,

   162

                        const struct option *__longopts, int *__longind);

   163

extern int getopt_long_only (int ___argc, char *const *___argv,

   164

                             const char *__shortopts,

   165

                             const struct option *__longopts, int *__longind);

   166

   167

/* Internal only.  Users should not call this directly.  */

   168

extern int _getopt_internal (int ___argc, char *const *___argv,

   169

                             const char *__shortopts,

   170

                             const struct option *__longopts, int *__longind,

   171

                             int __long_only);

   172

# endif

   173

#else /* not __STDC__ */

   174

extern int getopt ();

   175

# ifndef __need_getopt

   176

extern int getopt_long ();

   177

extern int getopt_long_only ();

   178

   179

extern int _getopt_internal ();

   180

# endif

   181

#endif /* __STDC__ */

   182

   183

#ifdef  __cplusplus

   184

}

   185

#endif

   186

   187

/* Make sure we later can get all the definitions and declarations.  */

   188

#undef __need_getopt

   189

   190

#endif /* getopt.h */

   191