The Tcpdump Group git mirrors - tcpdump/blob - win32/Include/getopt.h

   1 /* Declarations for getopt.
   2    Copyright (C) 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
   3
   4 This file is part of the GNU C Library.
   5
   6 The GNU C Library is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU Library General Public License as
   8 published by the Free Software Foundation; either version 2 of the
   9 License, or (at your option) any later version.
  10
  11 The GNU C Library is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 Library General Public License for more details.
  15
  16 You should have received a copy of the GNU Library General Public
  17 License along with the GNU C Library; see the file COPYING.LIB.  If
  18 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  19 Cambridge, MA 02139, USA.  */
  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 #ifndef WIN32
  35 extern char *optarg;
  36 #endif
  37
  38 /* Index in ARGV of the next element to be scanned.
  39    This is used for communication to and from the caller
  40    and for communication between successive calls to `getopt'.
  41
  42    On entry to `getopt', zero means this is the first call; initialize.
  43
  44    When `getopt' returns EOF, this is the index of the first of the
  45    non-option elements that the caller should itself scan.
  46
  47    Otherwise, `optind' communicates from one call to the next
  48    how much of ARGV has been scanned so far.  */
  49
  50 #ifndef WIN32
  51 extern int optind;
  52 #endif
  53
  54 /* Callers store zero here to inhibit the error message `getopt' prints
  55    for unrecognized options.  */
  56
  57 #ifndef WIN32
  58 extern int opterr;
  59 #endif
  60
  61 /* Set to an option character which was unrecognized.  */
  62
  63 extern int optopt;
  64
  65 /* Describe the long-named options requested by the application.
  66    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  67    of `struct option' terminated by an element containing a name which is
  68    zero.
  69
  70    The field `has_arg' is:
  71    no_argument          (or 0) if the option does not take an argument,
  72    required_argument    (or 1) if the option requires an argument,
  73    optional_argument    (or 2) if the option takes an optional argument.
  74
  75    If the field `flag' is not NULL, it points to a variable that is set
  76    to the value given in the field `val' when the option is found, but
  77    left unchanged if the option is not found.
  78
  79    To have a long-named option do something other than set an `int' to
  80    a compiled-in constant, such as set a value from `optarg', set the
  81    option's `flag' field to zero and its `val' field to a nonzero
  82    value (the equivalent single-letter option character, if there is
  83    one).  For long options that have a zero `flag' field, `getopt'
  84    returns the contents of the `val' field.  */
  85
  86 struct option
  87 {
  88 #if     __STDC__
  89   const char *name;
  90 #else
  91   char *name;
  92 #endif
  93   /* has_arg can't be an enum because some compilers complain about
  94      type mismatches in all the code that assumes it is an int.  */
  95   int has_arg;
  96   int *flag;
  97   int val;
  98 };
  99
 100 /* Names for the values of the `has_arg' field of `struct option'.  */
 101
 102 #define no_argument             0
 103 #define required_argument       1
 104 #define optional_argument       2
 105
 106 #if __STDC__
 107 #if defined(__GNU_LIBRARY__)
 108 /* Many other libraries have conflicting prototypes for getopt, with
 109    differences in the consts, in stdlib.h.  To avoid compilation
 110    errors, only prototype getopt for the GNU C library.  */
 111 extern int getopt (int argc, char *const *argv, const char *shortopts);
 112 #else /* not __GNU_LIBRARY__ */
 113 extern int getopt ();
 114 #endif /* not __GNU_LIBRARY__ */
 115 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
 116                         const struct option *longopts, int *longind);
 117 extern int getopt_long_only (int argc, char *const *argv,
 118                              const char *shortopts,
 119                              const struct option *longopts, int *longind);
 120
 121 /* Internal only.  Users should not call this directly.  */
 122 extern int _getopt_internal (int argc, char *const *argv,
 123                              const char *shortopts,
 124                              const struct option *longopts, int *longind,
 125                              int long_only);
 126 #else /* not __STDC__ */
 127 extern int getopt ();
 128 extern int getopt_long ();
 129 extern int getopt_long_only ();
 130
 131 extern int _getopt_internal ();
 132 #endif /* not __STDC__ */
 133
 134 #ifdef  __cplusplus
 135 }
 136 #endif
 137
 138 #endif /* _GETOPT_H */