getopt.h

   1 /* Declarations for getopt.
   2 Copyright (C) 1989-2012 Free Software Foundation, Inc.
   3
   4 NOTE: The canonical source of this file is maintained with the GNU C Library.
   5 Bugs can be reported to bug-glibc@gnu.org.
   6
   7 GNU Make is free software; you can redistribute it and/or modify it under the
   8 terms of the GNU General Public License as published by the Free Software
   9 Foundation; either version 3 of the License, or (at your option) any later
  10 version.
  11
  12 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  14 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License along with
  17 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _GETOPT_H
  20 #define _GETOPT_H 1
  21
  22 #ifdef  __cplusplus
  23 extern "C" {
  24 #endif
  25
  26 /* For communication from `getopt' to the caller.
  27    When `getopt' finds an option that takes an argument,
  28    the argument value is returned here.
  29    Also, when `ordering' is RETURN_IN_ORDER,
  30    each non-option ARGV-element is returned here.  */
  31
  32 extern char *optarg;
  33
  34 /* Index in ARGV of the next element to be scanned.
  35    This is used for communication to and from the caller
  36    and for communication between successive calls to `getopt'.
  37
  38    On entry to `getopt', zero means this is the first call; initialize.
  39
  40    When `getopt' returns -1, this is the index of the first of the
  41    non-option elements that the caller should itself scan.
  42
  43    Otherwise, `optind' communicates from one call to the next
  44    how much of ARGV has been scanned so far.  */
  45
  46 extern int optind;
  47
  48 /* Callers store zero here to inhibit the error message `getopt' prints
  49    for unrecognized options.  */
  50
  51 extern int opterr;
  52
  53 /* Set to an option character which was unrecognized.  */
  54
  55 extern int optopt;
  56
  57 /* Describe the long-named options requested by the application.
  58    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  59    of `struct option' terminated by an element containing a name which is
  60    zero.
  61
  62    The field `has_arg' is:
  63    no_argument          (or 0) if the option does not take an argument,
  64    required_argument    (or 1) if the option requires an argument,
  65    optional_argument    (or 2) if the option takes an optional argument.
  66
  67    If the field `flag' is not NULL, it points to a variable that is set
  68    to the value given in the field `val' when the option is found, but
  69    left unchanged if the option is not found.
  70
  71    To have a long-named option do something other than set an `int' to
  72    a compiled-in constant, such as set a value from `optarg', set the
  73    option's `flag' field to zero and its `val' field to a nonzero
  74    value (the equivalent single-letter option character, if there is
  75    one).  For long options that have a zero `flag' field, `getopt'
  76    returns the contents of the `val' field.  */
  77
  78 struct option
  79 {
  80 #if defined (__STDC__) && __STDC__
  81   const char *name;
  82 #else
  83   char *name;
  84 #endif
  85   /* has_arg can't be an enum because some compilers complain about
  86      type mismatches in all the code that assumes it is an int.  */
  87   int has_arg;
  88   int *flag;
  89   int val;
  90 };
  91
  92 /* Names for the values of the `has_arg' field of `struct option'.  */
  93
  94 #define no_argument             0
  95 #define required_argument       1
  96 #define optional_argument       2
  97
  98 #if defined (__STDC__) && __STDC__
  99 #ifdef __GNU_LIBRARY__
 100 /* Many other libraries have conflicting prototypes for getopt, with
 101    differences in the consts, in stdlib.h.  To avoid compilation
 102    errors, only prototype getopt for the GNU C library.  */
 103 extern int getopt (int argc, char *const *argv, const char *shortopts);
 104 #else /* not __GNU_LIBRARY__ */
 105 extern int getopt ();
 106 #endif /* __GNU_LIBRARY__ */
 107 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
 108                         const struct option *longopts, int *longind);
 109 extern int getopt_long_only (int argc, char *const *argv,
 110                              const char *shortopts,
 111                              const struct option *longopts, int *longind);
 112
 113 /* Internal only.  Users should not call this directly.  */
 114 extern int _getopt_internal (int argc, char *const *argv,
 115                              const char *shortopts,
 116                              const struct option *longopts, int *longind,
 117                              int long_only);
 118 #else /* not __STDC__ */
 119 extern int getopt ();
 120 extern int getopt_long ();
 121 extern int getopt_long_only ();
 122
 123 extern int _getopt_internal ();
 124 #endif /* __STDC__ */
 125
 126 #ifdef  __cplusplus
 127 }
 128 #endif
 129
 130 #endif /* getopt.h */