include/getopt.h

   1 /* declarations for getopt
   2    Copyright (C) 1989 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 1, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* For communication from `getopt' to the caller.
  19    When `getopt' finds an option that takes an argument,
  20    the argument value is returned here.
  21    Also, when `ordering' is RETURN_IN_ORDER,
  22    each non-option ARGV-element is returned here.  */
  23
  24 extern char *optarg;
  25
  26 /* Index in ARGV of the next element to be scanned.
  27    This is used for communication to and from the caller
  28    and for communication between successive calls to `getopt'.
  29
  30    On entry to `getopt', zero means this is the first call; initialize.
  31
  32    When `getopt' returns EOF, this is the index of the first of the
  33    non-option elements that the caller should itself scan.
  34
  35    Otherwise, `optind' communicates from one call to the next
  36    how much of ARGV has been scanned so far.  */
  37
  38 extern int optind;
  39
  40 /* Callers store zero here to inhibit the error message `getopt' prints
  41    for unrecognized options.  */
  42
  43 extern int opterr;
  44
  45 /* Describe the long-named options requested by the application.
  46    _GETOPT_LONG_OPTIONS is a vector of `struct option' terminated by an
  47    element containing a name which is zero.
  48    The field `has_arg' is:
  49    0 if the option does not take an argument,
  50    1 if the option requires an argument,
  51    2 if the option takes an optional argument.
  52    If the field `flag' is nonzero, it points to a variable that is set to
  53    the value given in the field `val' when the option is found, but
  54    left unchanged if the option is not found.  */
  55
  56 struct option
  57 {
  58   char *name;
  59   int has_arg;
  60   int *flag;
  61   int val;
  62 };
  63
  64 extern struct option *_getopt_long_options;
  65
  66 /* Name of long-named option actually found.
  67    Only changed when a long-named option is found.  */
  68
  69 extern char *_getopt_option_name;
  70
  71 /* The index in GETOPT_LONG_OPTIONS of the long-named option found.
  72    Only valid when a long-named option has been found by the most
  73    recent call to `getopt'.  */
  74
  75 extern int option_index;
  76