include/getopt.h

   1 /* Declarations for getopt.
   2    Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 2000,
   3    2002 Free Software Foundation, Inc.
   4
   5    NOTE: The canonical source of this file is maintained with the GNU C Library.
   6    Bugs can be reported to bug-glibc@gnu.org.
   7
   8    This program is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by the
  10    Free Software Foundation; either version 2, or (at your option) any
  11    later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  21    USA.  */
  22
  23 #ifndef _GETOPT_H
  24 #define _GETOPT_H 1
  25
  26 #ifdef  __cplusplus
  27 extern "C" {
  28 #endif
  29
  30 /* For communication from `getopt' to the caller.
  31    When `getopt' finds an option that takes an argument,
  32    the argument value is returned here.
  33    Also, when `ordering' is RETURN_IN_ORDER,
  34    each non-option ARGV-element is returned here.  */
  35
  36 extern char *optarg;
  37
  38 /* Index in ARGV of the next element to be scanned.
  39    This is used for communication to and from the caller
  40    and for communication between successive calls to `getopt'.
  41
  42    On entry to `getopt', zero means this is the first call; initialize.
  43
  44    When `getopt' returns -1, this is the index of the first of the
  45    non-option elements that the caller should itself scan.
  46
  47    Otherwise, `optind' communicates from one call to the next
  48    how much of ARGV has been scanned so far.  */
  49
  50 extern int optind;
  51
  52 /* Callers store zero here to inhibit the error message `getopt' prints
  53    for unrecognized options.  */
  54
  55 extern int opterr;
  56
  57 /* Set to an option character which was unrecognized.  */
  58
  59 extern int optopt;
  60
  61 /* Describe the long-named options requested by the application.
  62    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  63    of `struct option' terminated by an element containing a name which is
  64    zero.
  65
  66    The field `has_arg' is:
  67    no_argument          (or 0) if the option does not take an argument,
  68    required_argument    (or 1) if the option requires an argument,
  69    optional_argument    (or 2) if the option takes an optional argument.
  70
  71    If the field `flag' is not NULL, it points to a variable that is set
  72    to the value given in the field `val' when the option is found, but
  73    left unchanged if the option is not found.
  74
  75    To have a long-named option do something other than set an `int' to
  76    a compiled-in constant, such as set a value from `optarg', set the
  77    option's `flag' field to zero and its `val' field to a nonzero
  78    value (the equivalent single-letter option character, if there is
  79    one).  For long options that have a zero `flag' field, `getopt'
  80    returns the contents of the `val' field.  */
  81
  82 struct option
  83 {
  84 #if defined (__STDC__) && __STDC__
  85   const char *name;
  86 #else
  87   char *name;
  88 #endif
  89   /* has_arg can't be an enum because some compilers complain about
  90      type mismatches in all the code that assumes it is an int.  */
  91   int has_arg;
  92   int *flag;
  93   int val;
  94 };
  95
  96 /* Names for the values of the `has_arg' field of `struct option'.  */
  97
  98 #define no_argument             0
  99 #define required_argument       1
 100 #define optional_argument       2
 101
 102 #if defined (__STDC__) && __STDC__
 103 /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is
 104    undefined, we haven't run the autoconf check so provide the
 105    declaration without arguments.  If it is 0, we checked and failed
 106    to find the declaration so provide a fully prototyped one.  If it
 107    is 1, we found it so don't provide any declaration at all.  */
 108 #if !HAVE_DECL_GETOPT
 109 #if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT) || defined (__FreeBSD__)
 110 #if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT)
 111 /* Many other libraries have conflicting prototypes for getopt, with
 112    differences in the consts, in unistd.h.  To avoid compilation
 113    errors, only prototype getopt for environments where we know that
 114    there will ben o conflicts.  */
 115 extern int getopt (int argc, char *const *argv, const char *shortopts);
 116 #else
 117 #ifndef __cplusplus
 118 extern int getopt ();
 119 #endif /* __cplusplus */
 120 #endif
 121 #endif /* !HAVE_DECL_GETOPT */
 122
 123 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
 124                         const struct option *longopts, int *longind);
 125 extern int getopt_long_only (int argc, char *const *argv,
 126                              const char *shortopts,
 127                              const struct option *longopts, int *longind);
 128
 129 /* Internal only.  Users should not call this directly.  */
 130 extern int _getopt_internal (int argc, char *const *argv,
 131                              const char *shortopts,
 132                              const struct option *longopts, int *longind,
 133                              int long_only);
 134 #else /* not __STDC__ */
 135 extern int getopt ();
 136 extern int getopt_long ();
 137 extern int getopt_long_only ();
 138
 139 extern int _getopt_internal ();
 140 #endif /* __STDC__ */
 141
 142 #ifdef  __cplusplus
 143 }
 144 #endif
 145
 146 #endif /* getopt.h */