lib/getopt_.h

   1 /* Declarations for getopt.
   2    Copyright (C) 1989-1994,1996-1999,2001,2003,2004,2005,2006
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program 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
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License along
  17    with this program; if not, write to the Free Software Foundation,
  18    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  19
  20 #ifndef _GETOPT_H
  21
  22 #ifndef __need_getopt
  23 # define _GETOPT_H 1
  24 #endif
  25
  26 /* Standalone applications should #define __GETOPT_PREFIX to an
  27    identifier that prefixes the external functions and variables
  28    defined in this header.  When this happens, include the
  29    headers that might declare getopt so that they will not cause
  30    confusion if included after this file.  Then systematically rename
  31    identifiers so that they do not collide with the system functions
  32    and variables.  Renaming avoids problems with some compilers and
  33    linkers.  */
  34 #if defined __GETOPT_PREFIX && !defined __need_getopt
  35 # include <stdlib.h>
  36 # include <stdio.h>
  37 # include <unistd.h>
  38 # undef __need_getopt
  39 # undef getopt
  40 # undef getopt_long
  41 # undef getopt_long_only
  42 # undef optarg
  43 # undef opterr
  44 # undef optind
  45 # undef optopt
  46 # define __GETOPT_CONCAT(x, y) x ## y
  47 # define __GETOPT_XCONCAT(x, y) __GETOPT_CONCAT (x, y)
  48 # define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
  49 # define getopt __GETOPT_ID (getopt)
  50 # define getopt_long __GETOPT_ID (getopt_long)
  51 # define getopt_long_only __GETOPT_ID (getopt_long_only)
  52 # define optarg __GETOPT_ID (optarg)
  53 # define opterr __GETOPT_ID (opterr)
  54 # define optind __GETOPT_ID (optind)
  55 # define optopt __GETOPT_ID (optopt)
  56 #endif
  57
  58 /* Standalone applications get correct prototypes for getopt_long and
  59    getopt_long_only; they declare "char **argv".  libc uses prototypes
  60    with "char *const *argv" that are incorrect because getopt_long and
  61    getopt_long_only can permute argv; this is required for backward
  62    compatibility (e.g., for LSB 2.0.1).
  63
  64    This used to be `#if defined __GETOPT_PREFIX && !defined __need_getopt',
  65    but it caused redefinition warnings if both unistd.h and getopt.h were
  66    included, since unistd.h includes getopt.h having previously defined
  67    __need_getopt.
  68
  69    The only place where __getopt_argv_const is used is in definitions
  70    of getopt_long and getopt_long_only below, but these are visible
  71    only if __need_getopt is not defined, so it is quite safe to rewrite
  72    the conditional as follows:
  73 */
  74 #if !defined __need_getopt
  75 # if defined __GETOPT_PREFIX
  76 #  define __getopt_argv_const /* empty */
  77 # else
  78 #  define __getopt_argv_const const
  79 # endif
  80 #endif
  81
  82 /* If __GNU_LIBRARY__ is not already defined, either we are being used
  83    standalone, or this is the first header included in the source file.
  84    If we are being used with glibc, we need to include <features.h>, but
  85    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
  86    not defined, include <ctype.h>, which will pull in <features.h> for us
  87    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
  88    doesn't flood the namespace with stuff the way some other headers do.)  */
  89 #if !defined __GNU_LIBRARY__
  90 # include <ctype.h>
  91 #endif
  92
  93 #ifndef __THROW
  94 # ifndef __GNUC_PREREQ
  95 #  define __GNUC_PREREQ(maj, min) (0)
  96 # endif
  97 # if defined __cplusplus && __GNUC_PREREQ (2,8)
  98 #  define __THROW       throw ()
  99 # else
 100 #  define __THROW
 101 # endif
 102 #endif
 103
 104 #ifdef  __cplusplus
 105 extern "C" {
 106 #endif
 107
 108 /* For communication from `getopt' to the caller.
 109    When `getopt' finds an option that takes an argument,
 110    the argument value is returned here.
 111    Also, when `ordering' is RETURN_IN_ORDER,
 112    each non-option ARGV-element is returned here.  */
 113
 114 extern char *optarg;
 115
 116 /* Index in ARGV of the next element to be scanned.
 117    This is used for communication to and from the caller
 118    and for communication between successive calls to `getopt'.
 119
 120    On entry to `getopt', zero means this is the first call; initialize.
 121
 122    When `getopt' returns -1, this is the index of the first of the
 123    non-option elements that the caller should itself scan.
 124
 125    Otherwise, `optind' communicates from one call to the next
 126    how much of ARGV has been scanned so far.  */
 127
 128 extern int optind;
 129
 130 /* Callers store zero here to inhibit the error message `getopt' prints
 131    for unrecognized options.  */
 132
 133 extern int opterr;
 134
 135 /* Set to an option character which was unrecognized.  */
 136
 137 extern int optopt;
 138
 139 #ifndef __need_getopt
 140 /* Describe the long-named options requested by the application.
 141    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
 142    of `struct option' terminated by an element containing a name which is
 143    zero.
 144
 145    The field `has_arg' is:
 146    no_argument          (or 0) if the option does not take an argument,
 147    required_argument    (or 1) if the option requires an argument,
 148    optional_argument    (or 2) if the option takes an optional argument.
 149
 150    If the field `flag' is not NULL, it points to a variable that is set
 151    to the value given in the field `val' when the option is found, but
 152    left unchanged if the option is not found.
 153
 154    To have a long-named option do something other than set an `int' to
 155    a compiled-in constant, such as set a value from `optarg', set the
 156    option's `flag' field to zero and its `val' field to a nonzero
 157    value (the equivalent single-letter option character, if there is
 158    one).  For long options that have a zero `flag' field, `getopt'
 159    returns the contents of the `val' field.  */
 160
 161 struct option
 162 {
 163   const char *name;
 164   /* has_arg can't be an enum because some compilers complain about
 165      type mismatches in all the code that assumes it is an int.  */
 166   int has_arg;
 167   int *flag;
 168   int val;
 169 };
 170
 171 /* Names for the values of the `has_arg' field of `struct option'.  */
 172
 173 # define no_argument            0
 174 # define required_argument      1
 175 # define optional_argument      2
 176 #endif  /* need getopt */
 177
 178
 179 /* Get definitions and prototypes for functions to process the
 180    arguments in ARGV (ARGC of them, minus the program name) for
 181    options given in OPTS.
 182
 183    Return the option character from OPTS just read.  Return -1 when
 184    there are no more options.  For unrecognized options, or options
 185    missing arguments, `optopt' is set to the option letter, and '?' is
 186    returned.
 187
 188    The OPTS string is a list of characters which are recognized option
 189    letters, optionally followed by colons, specifying that that letter
 190    takes an argument, to be placed in `optarg'.
 191
 192    If a letter in OPTS is followed by two colons, its argument is
 193    optional.  This behavior is specific to the GNU `getopt'.
 194
 195    The argument `--' causes premature termination of argument
 196    scanning, explicitly telling `getopt' that there are no more
 197    options.
 198
 199    If OPTS begins with `-', then non-option arguments are treated as
 200    arguments to the option '\1'.  This behavior is specific to the GNU
 201    `getopt'.  If OPTS begins with `+', or POSIXLY_CORRECT is set in
 202    the environment, then do not permute arguments.  */
 203
 204 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
 205        __THROW;
 206
 207 #ifndef __need_getopt
 208 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
 209                         const char *__shortopts,
 210                         const struct option *__longopts, int *__longind)
 211        __THROW;
 212 extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
 213                              const char *__shortopts,
 214                              const struct option *__longopts, int *__longind)
 215        __THROW;
 216
 217 #endif
 218
 219 #ifdef  __cplusplus
 220 }
 221 #endif
 222
 223 /* Make sure we later can get all the definitions and declarations.  */
 224 #undef __need_getopt
 225
 226 #endif /* getopt.h */