lib/getopt.h

   1 /* Declarations for getopt.
   2    Copyright (C) 1989-1994, 1996-1999, 2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _GETOPT_H
  20
  21 #ifndef __need_getopt
  22 # define _GETOPT_H 1
  23 #endif
  24
  25 /* If __GNU_LIBRARY__ is not already defined, either we are being used
  26    standalone, or this is the first header included in the source file.
  27    If we are being used with glibc, we need to include <features.h>, but
  28    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
  29    not defined, include <ctype.h>, which will pull in <features.h> for us
  30    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
  31    doesn't flood the namespace with stuff the way some other headers do.)  */
  32 #if !defined __GNU_LIBRARY__
  33 # include <ctype.h>
  34 #endif
  35
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 /* For communication from `getopt' to the caller.
  41    When `getopt' finds an option that takes an argument,
  42    the argument value is returned here.
  43    Also, when `ordering' is RETURN_IN_ORDER,
  44    each non-option ARGV-element is returned here.  */
  45
  46 extern char *optarg;
  47
  48 /* Index in ARGV of the next element to be scanned.
  49    This is used for communication to and from the caller
  50    and for communication between successive calls to `getopt'.
  51
  52    On entry to `getopt', zero means this is the first call; initialize.
  53
  54    When `getopt' returns -1, this is the index of the first of the
  55    non-option elements that the caller should itself scan.
  56
  57    Otherwise, `optind' communicates from one call to the next
  58    how much of ARGV has been scanned so far.  */
  59
  60 extern int optind;
  61
  62 /* Callers store zero here to inhibit the error message `getopt' prints
  63    for unrecognized options.  */
  64
  65 extern int opterr;
  66
  67 /* Set to an option character which was unrecognized.  */
  68
  69 extern int optopt;
  70
  71 #ifndef __need_getopt
  72 /* Describe the long-named options requested by the application.
  73    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  74    of `struct option' terminated by an element containing a name which is
  75    zero.
  76
  77    The field `has_arg' is:
  78    no_argument          (or 0) if the option does not take an argument,
  79    required_argument    (or 1) if the option requires an argument,
  80    optional_argument    (or 2) if the option takes an optional argument.
  81
  82    If the field `flag' is not NULL, it points to a variable that is set
  83    to the value given in the field `val' when the option is found, but
  84    left unchanged if the option is not found.
  85
  86    To have a long-named option do something other than set an `int' to
  87    a compiled-in constant, such as set a value from `optarg', set the
  88    option's `flag' field to zero and its `val' field to a nonzero
  89    value (the equivalent single-letter option character, if there is
  90    one).  For long options that have a zero `flag' field, `getopt'
  91    returns the contents of the `val' field.  */
  92
  93 struct option
  94 {
  95 # if (defined __STDC__ && __STDC__) || defined __cplusplus
  96   const char *name;
  97 # else
  98   char *name;
  99 # endif
 100   /* has_arg can't be an enum because some compilers complain about
 101      type mismatches in all the code that assumes it is an int.  */
 102   int has_arg;
 103   int *flag;
 104   int val;
 105 };
 106
 107 /* Names for the values of the `has_arg' field of `struct option'.  */
 108
 109 # define no_argument            0
 110 # define required_argument      1
 111 # define optional_argument      2
 112 #endif  /* need getopt */
 113
 114
 115 /* Get definitions and prototypes for functions to process the
 116    arguments in ARGV (ARGC of them, minus the program name) for
 117    options given in OPTS.
 118
 119    Return the option character from OPTS just read.  Return -1 when
 120    there are no more options.  For unrecognized options, or options
 121    missing arguments, `optopt' is set to the option letter, and '?' is
 122    returned.
 123
 124    The OPTS string is a list of characters which are recognized option
 125    letters, optionally followed by colons, specifying that that letter
 126    takes an argument, to be placed in `optarg'.
 127
 128    If a letter in OPTS is followed by two colons, its argument is
 129    optional.  This behavior is specific to the GNU `getopt'.
 130
 131    The argument `--' causes premature termination of argument
 132    scanning, explicitly telling `getopt' that there are no more
 133    options.
 134
 135    If OPTS begins with `--', then non-option arguments are treated as
 136    arguments to the option '\0'.  This behavior is specific to the GNU
 137    `getopt'.  */
 138
 139 #if (defined __STDC__ && __STDC__) || defined __cplusplus
 140 # ifdef __GNU_LIBRARY__
 141 /* Many other libraries have conflicting prototypes for getopt, with
 142    differences in the consts, in stdlib.h.  To avoid compilation
 143    errors, only prototype getopt for the GNU C library.  */
 144 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts);
 145 # else /* not __GNU_LIBRARY__ */
 146 extern int getopt ();
 147 # endif /* __GNU_LIBRARY__ */
 148
 149 # ifndef __need_getopt
 150 extern int getopt_long (int ___argc, char *const *___argv,
 151                         const char *__shortopts,
 152                         const struct option *__longopts, int *__longind);
 153 extern int getopt_long_only (int ___argc, char *const *___argv,
 154                              const char *__shortopts,
 155                              const struct option *__longopts, int *__longind);
 156
 157 /* Internal only.  Users should not call this directly.  */
 158 extern int _getopt_internal (int ___argc, char *const *___argv,
 159                              const char *__shortopts,
 160                              const struct option *__longopts, int *__longind,
 161                              int __long_only);
 162 # endif
 163 #else /* not __STDC__ */
 164 extern int getopt ();
 165 # ifndef __need_getopt
 166 extern int getopt_long ();
 167 extern int getopt_long_only ();
 168
 169 extern int _getopt_internal ();
 170 # endif
 171 #endif /* __STDC__ */
 172
 173 #ifdef  __cplusplus
 174 }
 175 #endif
 176
 177 /* Make sure we later can get all the definitions and declarations.  */
 178 #undef __need_getopt
 179
 180 #endif /* getopt.h */