libs/port/getopt.h

   1 /* Declarations for getopt.
   2    Copyright (C) 1989-1994, 1996-1999, 2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  18    MA 02110-1301, USA  */
  19
  20 #ifndef _GETOPT_H
  21
  22 #ifndef __need_getopt
  23 # define _GETOPT_H 1
  24 #endif
  25
  26 /* If __GNU_LIBRARY__ is not already defined, either we are being used
  27    standalone, or this is the first header included in the source file.
  28    If we are being used with glibc, we need to include <features.h>, but
  29    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
  30    not defined, include <ctype.h>, which will pull in <features.h> for us
  31    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
  32    doesn't flood the namespace with stuff the way some other headers do.)  */
  33 #if !defined __GNU_LIBRARY__
  34 # include <ctype.h>
  35 #endif
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 /* For communication from `getopt' to the caller.
  42    When `getopt' finds an option that takes an argument,
  43    the argument value is returned here.
  44    Also, when `ordering' is RETURN_IN_ORDER,
  45    each non-option ARGV-element is returned here.  */
  46
  47 extern char *optarg;
  48
  49 /* Index in ARGV of the next element to be scanned.
  50    This is used for communication to and from the caller
  51    and for communication between successive calls to `getopt'.
  52
  53    On entry to `getopt', zero means this is the first call; initialize.
  54
  55    When `getopt' returns -1, this is the index of the first of the
  56    non-option elements that the caller should itself scan.
  57
  58    Otherwise, `optind' communicates from one call to the next
  59    how much of ARGV has been scanned so far.  */
  60
  61 extern int optind;
  62
  63 /* Callers store zero here to inhibit the error message `getopt' prints
  64    for unrecognized options.  */
  65
  66 extern int opterr;
  67
  68 /* Set to an option character which was unrecognized.  */
  69
  70 extern int optopt;
  71
  72 #ifndef __need_getopt
  73 /* Describe the long-named options requested by the application.
  74    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  75    of `struct option' terminated by an element containing a name which is
  76    zero.
  77
  78    The field `has_arg' is:
  79    no_argument          (or 0) if the option does not take an argument,
  80    required_argument    (or 1) if the option requires an argument,
  81    optional_argument    (or 2) if the option takes an optional argument.
  82
  83    If the field `flag' is not NULL, it points to a variable that is set
  84    to the value given in the field `val' when the option is found, but
  85    left unchanged if the option is not found.
  86
  87    To have a long-named option do something other than set an `int' to
  88    a compiled-in constant, such as set a value from `optarg', set the
  89    option's `flag' field to zero and its `val' field to a nonzero
  90    value (the equivalent single-letter option character, if there is
  91    one).  For long options that have a zero `flag' field, `getopt'
  92    returns the contents of the `val' field.  */
  93
  94 struct option
  95 {
  96 # if (defined __STDC__ && __STDC__) || defined __cplusplus
  97   const char *name;
  98 # else
  99   char *name;
 100 # endif
 101   /* has_arg can't be an enum because some compilers complain about
 102      type mismatches in all the code that assumes it is an int.  */
 103   int has_arg;
 104   int *flag;
 105   int val;
 106 };
 107
 108 /* Names for the values of the `has_arg' field of `struct option'.  */
 109
 110 # define no_argument            0
 111 # define required_argument      1
 112 # define optional_argument      2
 113 #endif  /* need getopt */
 114
 115
 116 /* Internal only.  Users should not call this directly.  */
 117 extern int _getopt_internal (int ___argc, char *const *___argv,
 118                              const char *__shortopts,
 119                              const struct option *__longopts, int *__longind,
 120                              int __long_only);
 121
 122 #ifdef  __cplusplus
 123 }
 124 #endif
 125
 126 /* Make sure we later can get all the definitions and declarations.  */
 127 #undef __need_getopt
 128
 129 #endif /* getopt.h */