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  1. /* Declarations for getopt.
  2.    Copyright (C) 1989-2015 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.    This program is free software; you can redistribute it and/or modify it
  8.    under the terms of the GNU General Public License as published by the
  9.    Free Software Foundation; either version 2, or (at your option) any
  10.    later version.
  11.  
  12.    This program is distributed in the hope that it will be useful,
  13.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.    GNU General Public License for more details.
  16.  
  17.    You should have received a copy of the GNU General Public License
  18.    along with this program; if not, write to the Free Software
  19.    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
  20.    USA.  */
  21.  
  22. #ifndef _GETOPT_H
  23. #define _GETOPT_H 1
  24.  
  25. #ifdef  __cplusplus
  26. extern "C" {
  27. #endif
  28.  
  29. /* For communication from `getopt' to the caller.
  30.    When `getopt' finds an option that takes an argument,
  31.    the argument value is returned here.
  32.    Also, when `ordering' is RETURN_IN_ORDER,
  33.    each non-option ARGV-element is returned here.  */
  34.  
  35. extern char *optarg;
  36.  
  37. /* Index in ARGV of the next element to be scanned.
  38.    This is used for communication to and from the caller
  39.    and for communication between successive calls to `getopt'.
  40.  
  41.    On entry to `getopt', zero means this is the first call; initialize.
  42.  
  43.    When `getopt' returns -1, this is the index of the first of the
  44.    non-option elements that the caller should itself scan.
  45.  
  46.    Otherwise, `optind' communicates from one call to the next
  47.    how much of ARGV has been scanned so far.  */
  48.  
  49. extern int optind;
  50.  
  51. /* Callers store zero here to inhibit the error message `getopt' prints
  52.    for unrecognized options.  */
  53.  
  54. extern int opterr;
  55.  
  56. /* Set to an option character which was unrecognized.  */
  57.  
  58. extern int optopt;
  59.  
  60. /* Describe the long-named options requested by the application.
  61.    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  62.    of `struct option' terminated by an element containing a name which is
  63.    zero.
  64.  
  65.    The field `has_arg' is:
  66.    no_argument          (or 0) if the option does not take an argument,
  67.    required_argument    (or 1) if the option requires an argument,
  68.    optional_argument    (or 2) if the option takes an optional argument.
  69.  
  70.    If the field `flag' is not NULL, it points to a variable that is set
  71.    to the value given in the field `val' when the option is found, but
  72.    left unchanged if the option is not found.
  73.  
  74.    To have a long-named option do something other than set an `int' to
  75.    a compiled-in constant, such as set a value from `optarg', set the
  76.    option's `flag' field to zero and its `val' field to a nonzero
  77.    value (the equivalent single-letter option character, if there is
  78.    one).  For long options that have a zero `flag' field, `getopt'
  79.    returns the contents of the `val' field.  */
  80.  
  81. struct option
  82. {
  83. #if defined (__STDC__) && __STDC__
  84.   const char *name;
  85. #else
  86.   char *name;
  87. #endif
  88.   /* has_arg can't be an enum because some compilers complain about
  89.      type mismatches in all the code that assumes it is an int.  */
  90.   int has_arg;
  91.   int *flag;
  92.   int val;
  93. };
  94.  
  95. /* Names for the values of the `has_arg' field of `struct option'.  */
  96.  
  97. #define no_argument             0
  98. #define required_argument       1
  99. #define optional_argument       2
  100.  
  101. #if defined (__STDC__) && __STDC__
  102. /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is
  103.    undefined, we haven't run the autoconf check so provide the
  104.    declaration without arguments.  If it is 0, we checked and failed
  105.    to find the declaration so provide a fully prototyped one.  If it
  106.    is 1, we found it so don't provide any declaration at all.  */
  107. #if !HAVE_DECL_GETOPT
  108. #if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT)
  109. /* Many other libraries have conflicting prototypes for getopt, with
  110.    differences in the consts, in unistd.h.  To avoid compilation
  111.    errors, only prototype getopt for the GNU C library.  */
  112. extern int getopt (int argc, char *const *argv, const char *shortopts);
  113. #else
  114. #ifndef __cplusplus
  115. extern int getopt ();
  116. #endif /* __cplusplus */
  117. #endif
  118. #endif /* !HAVE_DECL_GETOPT */
  119.  
  120. extern int getopt_long (int argc, char *const *argv, const char *shortopts,
  121.                         const struct option *longopts, int *longind);
  122. extern int getopt_long_only (int argc, char *const *argv,
  123.                              const char *shortopts,
  124.                              const struct option *longopts, int *longind);
  125.  
  126. /* Internal only.  Users should not call this directly.  */
  127. extern int _getopt_internal (int argc, char *const *argv,
  128.                              const char *shortopts,
  129.                              const struct option *longopts, int *longind,
  130.                              int long_only);
  131. #else /* not __STDC__ */
  132. extern int getopt ();
  133. extern int getopt_long ();
  134. extern int getopt_long_only ();
  135.  
  136. extern int _getopt_internal ();
  137. #endif /* __STDC__ */
  138.  
  139. #ifdef  __cplusplus
  140. }
  141. #endif
  142.  
  143. #endif /* getopt.h */
  144.