getopt.h

   1 /* Declarations for getopt.
   2 Copyright (C) 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation,
   4 Inc.
   5
   6 NOTE: The canonical source of this file is maintained with the GNU C Library.
   7 Bugs can be reported to bug-glibc@gnu.org.
   8
   9 GNU Make is free software; you can redistribute it and/or modify it under the
  10 terms of the GNU General Public License as published by the Free Software
  11 Foundation; either version 3 of the License, or (at your option) any later
  12 version.
  13
  14 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  16 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License along with
  19 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef _GETOPT_H
  22 #define _GETOPT_H 1
  23
  24 #ifdef  __cplusplus
  25 extern "C" {
  26 #endif
  27
  28 /* For communication from `getopt' to the caller.
  29    When `getopt' finds an option that takes an argument,
  30    the argument value is returned here.
  31    Also, when `ordering' is RETURN_IN_ORDER,
  32    each non-option ARGV-element is returned here.  */
  33
  34 extern char *optarg;
  35
  36 /* Index in ARGV of the next element to be scanned.
  37    This is used for communication to and from the caller
  38    and for communication between successive calls to `getopt'.
  39
  40    On entry to `getopt', zero means this is the first call; initialize.
  41
  42    When `getopt' returns -1, this is the index of the first of the
  43    non-option elements that the caller should itself scan.
  44
  45    Otherwise, `optind' communicates from one call to the next
  46    how much of ARGV has been scanned so far.  */
  47
  48 extern int optind;
  49
  50 /* Callers store zero here to inhibit the error message `getopt' prints
  51    for unrecognized options.  */
  52
  53 extern int opterr;
  54
  55 /* Set to an option character which was unrecognized.  */
  56
  57 extern int optopt;
  58
  59 /* Describe the long-named options requested by the application.
  60    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  61    of `struct option' terminated by an element containing a name which is
  62    zero.
  63
  64    The field `has_arg' is:
  65    no_argument          (or 0) if the option does not take an argument,
  66    required_argument    (or 1) if the option requires an argument,
  67    optional_argument    (or 2) if the option takes an optional argument.
  68
  69    If the field `flag' is not NULL, it points to a variable that is set
  70    to the value given in the field `val' when the option is found, but
  71    left unchanged if the option is not found.
  72
  73    To have a long-named option do something other than set an `int' to
  74    a compiled-in constant, such as set a value from `optarg', set the
  75    option's `flag' field to zero and its `val' field to a nonzero
  76    value (the equivalent single-letter option character, if there is
  77    one).  For long options that have a zero `flag' field, `getopt'
  78    returns the contents of the `val' field.  */
  79
  80 struct option
  81 {
  82 #if defined (__STDC__) && __STDC__
  83   const char *name;
  84 #else
  85   char *name;
  86 #endif
  87   /* has_arg can't be an enum because some compilers complain about
  88      type mismatches in all the code that assumes it is an int.  */
  89   int has_arg;
  90   int *flag;
  91   int val;
  92 };
  93
  94 /* Names for the values of the `has_arg' field of `struct option'.  */
  95
  96 #define no_argument             0
  97 #define required_argument       1
  98 #define optional_argument       2
  99
 100 #if defined (__STDC__) && __STDC__
 101 #ifdef __GNU_LIBRARY__
 102 /* Many other libraries have conflicting prototypes for getopt, with
 103    differences in the consts, in stdlib.h.  To avoid compilation
 104    errors, only prototype getopt for the GNU C library.  */
 105 extern int getopt (int argc, char *const *argv, const char *shortopts);
 106 #else /* not __GNU_LIBRARY__ */
 107 extern int getopt ();
 108 #endif /* __GNU_LIBRARY__ */
 109 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
 110                         const struct option *longopts, int *longind);
 111 extern int getopt_long_only (int argc, char *const *argv,
 112                              const char *shortopts,
 113                              const struct option *longopts, int *longind);
 114
 115 /* Internal only.  Users should not call this directly.  */
 116 extern int _getopt_internal (int argc, char *const *argv,
 117                              const char *shortopts,
 118                              const struct option *longopts, int *longind,
 119                              int long_only);
 120 #else /* not __STDC__ */
 121 extern int getopt ();
 122 extern int getopt_long ();
 123 extern int getopt_long_only ();
 124
 125 extern int _getopt_internal ();
 126 #endif /* __STDC__ */
 127
 128 #ifdef  __cplusplus
 129 }
 130 #endif
 131
 132 #endif /* getopt.h */