getopt.h

   1 /* Declarations for getopt.
   2    Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU C Library.  Its master source is NOT part of
   5    the C library, however.  The master source lives in /gd/gnu/lib.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library 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 GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _GETOPT_H
  23 #define _GETOPT_H 1
  24
  25 #ifdef  __cplusplus
  26 extern "C"
  27 {
  28 #endif
  29
  30 /* For communication from `getopt' to the caller.
  31    When `getopt' finds an option that takes an argument,
  32    the argument value is returned here.
  33    Also, when `ordering' is RETURN_IN_ORDER,
  34    each non-option ARGV-element is returned here.  */
  35
  36         extern char *optarg;
  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 -1, 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         extern int optind;
  51
  52 /* Callers store zero here to inhibit the error message `getopt' prints
  53    for unrecognized options.  */
  54
  55         extern int opterr;
  56
  57 /* Set to an option character which was unrecognized.  */
  58
  59         extern int optopt;
  60
  61 /* Describe the long-named options requested by the application.
  62    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
  63    of `struct option' terminated by an element containing a name which is
  64    zero.
  65
  66    The field `has_arg' is:
  67    no_argument          (or 0) if the option does not take an argument,
  68    required_argument    (or 1) if the option requires an argument,
  69    optional_argument    (or 2) if the option takes an optional argument.
  70
  71    If the field `flag' is not NULL, it points to a variable that is set
  72    to the value given in the field `val' when the option is found, but
  73    left unchanged if the option is not found.
  74
  75    To have a long-named option do something other than set an `int' to
  76    a compiled-in constant, such as set a value from `optarg', set the
  77    option's `flag' field to zero and its `val' field to a nonzero
  78    value (the equivalent single-letter option character, if there is
  79    one).  For long options that have a zero `flag' field, `getopt'
  80    returns the contents of the `val' field.  */
  81
  82         struct option
  83         {
  84 #if defined (__STDC__) && __STDC__
  85                 const char *name;
  86 #else
  87                 char *name;
  88 #endif
  89                 /* has_arg can't be an enum because some compilers complain about
  90                    type 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 #define no_argument             0
  99 #define required_argument       1
 100 #define optional_argument       2
 101
 102 #if defined (__STDC__) && __STDC__
 103 #ifdef __GNU_LIBRARY__
 104 /* Many other libraries have conflicting prototypes for getopt, with
 105    differences in the consts, in stdlib.h.  To avoid compilation
 106    errors, only prototype getopt for the GNU C library.  */
 107         extern int getopt(int argc, char *const *argv, const char *shortopts);
 108 #else                           /* not __GNU_LIBRARY__ */
 109         extern int getopt();
 110 #endif                          /* __GNU_LIBRARY__ */
 111         extern int getopt_long(int argc, char *const *argv, const char *shortopts,
 112                                const struct option *longopts, int *longind);
 113         extern int getopt_long_only(int argc, char *const *argv,
 114                                     const char *shortopts,
 115                                const struct option *longopts, int *longind);
 116
 117 /* Internal only.  Users should not call this directly.  */
 118         extern int _getopt_internal(int argc, char *const *argv,
 119                                     const char *shortopts,
 120                                 const struct option *longopts, int *longind,
 121                                     int long_only);
 122 #else                           /* not __STDC__ */
 123         extern int getopt();
 124         extern int getopt_long();
 125         extern int getopt_long_only();
 126
 127         extern int _getopt_internal();
 128 #endif                          /* __STDC__ */
 129
 130 #ifdef  __cplusplus
 131 }
 132 #endif
 133
 134 #endif                          /* _GETOPT_H */