src/getopt_long.h

   1
   2 /* Declarations for getopt.
   3    Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 2, or (at your option) any
   8    later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19    This file was modified slightly by Ian Lance Taylor, November 1992,
  20    for Taylor UUCP, and again in June, 1995.  */
  21
  22 #ifndef _GETOPT_H
  23 #define _GETOPT_H 1
  24
  25 #ifdef  __cplusplus
  26 extern "C"
  27 {
  28 #endif
  29
  30 /* Ian Lance Taylor <ian@airs.com> added the following defines for
  31    Taylor UUCP.  This avoids reported conflicts with system getopt
  32    definitions.  */
  33 #define getopt gnu_getopt
  34 #define optarg gnu_optarg
  35 #define optind gnu_optind
  36 #define opterr gnu_opterr
  37
  38 /* For communication from `getopt' to the caller.
  39    When `getopt' finds an option that takes an argument,
  40    the argument value is returned here.
  41    Also, when `ordering' is RETURN_IN_ORDER,
  42    each non-option ARGV-element is returned here.  */
  43
  44   extern char *optarg;
  45
  46 /* Index in ARGV of the next element to be scanned.
  47    This is used for communication to and from the caller
  48    and for communication between successive calls to `getopt'.
  49
  50    On entry to `getopt', zero means this is the first call; initialize.
  51
  52    When `getopt' returns EOF, this is the index of the first of the
  53    non-option elements that the caller should itself scan.
  54
  55    Otherwise, `optind' communicates from one call to the next
  56    how much of ARGV has been scanned so far.  */
  57
  58   extern int optind;
  59
  60 /* Callers store zero here to inhibit the error message `getopt' prints
  61    for unrecognized options.  */
  62
  63   extern int opterr;
  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     const char *name;
  89     /* has_arg can't be an enum because some compilers complain about type
  90      * mismatches in all the code that assumes it is an int.  */
  91     int has_arg;
  92     int *flag;
  93     int val;
  94   };
  95
  96 /* Names for the values of the `has_arg' field of `struct option'.  */
  97
  98   enum _argtype
  99   {
 100     no_argument,
 101     required_argument,
 102     optional_argument
 103   };
 104
 105 #ifndef P
 106
 107 /* On some systems, <stdio.h> includes getopt.h before P is defined by
 108    uucp.h, and the -I arguments cause this version of getopt.h to be
 109    included.  Work around that here.  */
 110 #define P(x) ()
 111 #define UNDEFINE_P
 112 #endif
 113
 114   extern int getopt P ((int argc, char *const *argv, const char *shortopts));
 115   extern int getopt_long
 116     P ((int argc, char *const *argv, const char *shortopts,
 117         const struct option * longopts, int *longind));
 118   extern int getopt_long_only
 119     P ((int argc, char *const *argv, const char *shortopts,
 120         const struct option * longopts, int *longind));
 121
 122 /* Internal only.  Users should not call this directly.  */
 123   extern int _getopt_internal
 124     P ((int argc, char *const *argv, const char *shortopts,
 125         const struct option * longopts, int *longind, int long_only));
 126
 127 #ifdef UNDEFINE_P
 128 #undef P
 129 #undef UNDEFINE_P
 130 #endif
 131
 132 #ifdef  __cplusplus
 133 }
 134 #endif
 135
 136 #endif                          /* _GETOPT_H */