finch/getopt.h

   1 /* Declarations for getopt.
   2
   3    NOTE: getopt is now part of the C library, so if you don't know what
   4    "Keep this file name-space clean" means, talk to roland@gnu.ai.mit.edu
   5    before changing it!
   6
   7    Finch is the legal property of its developers, whose names are too numerous
   8    to list here.  Please refer to the COPYRIGHT file distributed with this
   9    source distribution.
  10
  11    This program is free software; you can redistribute it and/or modify it
  12    under the terms of the GNU General Public License as published by the
  13    Free Software Foundation; either version 2, or (at your option) any
  14    later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  24
  25 #ifndef _GETOPT_H
  26 #define _GETOPT_H 1
  27
  28 #ifdef  __cplusplus
  29 extern "C" {
  30 #endif
  31
  32 /* For communication from `getopt' to the caller.
  33    When `getopt' finds an option that takes an argument,
  34    the argument value is returned here.
  35    Also, when `ordering' is RETURN_IN_ORDER,
  36    each non-option ARGV-element is returned here.  */
  37
  38 extern char *optarg;
  39
  40 /* Index in ARGV of the next element to be scanned.
  41    This is used for communication to and from the caller
  42    and for communication between successive calls to `getopt'.
  43
  44    On entry to `getopt', zero means this is the first call; initialize.
  45
  46    When `getopt' returns EOF, this is the index of the first of the
  47    non-option elements that the caller should itself scan.
  48
  49    Otherwise, `optind' communicates from one call to the next
  50    how much of ARGV has been scanned so far.  */
  51
  52 extern int optind;
  53
  54 /* Callers store zero here to inhibit the error message `getopt' prints
  55    for unrecognized options.  */
  56
  57 extern int opterr;
  58
  59 /* Set to an option character which was unrecognized.  */
  60
  61 extern int optopt;
  62
  63 /* Describe the long-named options requested by the application.
  64    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  65    of `struct option' terminated by an element containing a name which is
  66    zero.
  67
  68    The field `has_arg' is:
  69    no_argument          (or 0) if the option does not take an argument,
  70    required_argument    (or 1) if the option requires an argument,
  71    optional_argument    (or 2) if the option takes an optional argument.
  72
  73    If the field `flag' is not NULL, it points to a variable that is set
  74    to the value given in the field `val' when the option is found, but
  75    left unchanged if the option is not found.
  76
  77    To have a long-named option do something other than set an `int' to
  78    a compiled-in constant, such as set a value from `optarg', set the
  79    option's `flag' field to zero and its `val' field to a nonzero
  80    value (the equivalent single-letter option character, if there is
  81    one).  For long options that have a zero `flag' field, `getopt'
  82    returns the contents of the `val' field.  */
  83
  84 struct option
  85 {
  86 #if     __STDC__
  87   const char *name;
  88 #else
  89   char *name;
  90 #endif
  91   /* has_arg can't be an enum because some compilers complain about
  92      type mismatches in all the code that assumes it is an int.  */
  93   int has_arg;
  94   int *flag;
  95   int val;
  96 };
  97
  98 /* Names for the values of the `has_arg' field of `struct option'.  */
  99
 100 #define no_argument             0
 101 #define required_argument       1
 102 #define optional_argument       2
 103
 104 #if __STDC__
 105 #if defined(__GNU_LIBRARY__)
 106 /* Many other libraries have conflicting prototypes for getopt, with
 107    differences in the consts, in stdlib.h.  To avoid compilation
 108    errors, only prototype getopt for the GNU C library.  */
 109 extern int getopt (int argc, char *const *argv, const char *shortopts);
 110 #else /* not __GNU_LIBRARY__ */
 111 extern int getopt ();
 112 #endif /* not __GNU_LIBRARY__ */
 113 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
 114                         const struct option *longopts, int *longind);
 115 extern int getopt_long_only (int argc, char *const *argv,
 116                              const char *shortopts,
 117                              const struct option *longopts, int *longind);
 118
 119 /* Internal only.  Users should not call this directly.  */
 120 extern int _getopt_internal (int argc, char *const *argv,
 121                              const char *shortopts,
 122                              const struct option *longopts, int *longind,
 123                              int long_only);
 124 #else /* not __STDC__ */
 125 extern int getopt ();
 126 extern int getopt_long ();
 127 extern int getopt_long_only ();
 128
 129 extern int _getopt_internal ();
 130 #endif /* not __STDC__ */
 131
 132 #ifdef  __cplusplus
 133 }
 134 #endif
 135
 136 #endif /* _GETOPT_H */