src/gnulib/getopt.in.h

   1 /* Declarations for getopt.
   2    Copyright (C) 1989-1994,1996-1999,2001,2003,2004,2005,2006,2007
   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 Lesser General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) 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 Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _GETOPT_H
  20
  21 #ifndef __need_getopt
  22 # define _GETOPT_H 1
  23 #endif
  24
  25 /* Standalone applications should #define __GETOPT_PREFIX to an
  26    identifier that prefixes the external functions and variables
  27    defined in this header.  When this happens, include the
  28    headers that might declare getopt so that they will not cause
  29    confusion if included after this file.  Then systematically rename
  30    identifiers so that they do not collide with the system functions
  31    and variables.  Renaming avoids problems with some compilers and
  32    linkers.  */
  33 #if defined __GETOPT_PREFIX && !defined __need_getopt
  34 # include <stdlib.h>
  35 # include <stdio.h>
  36 # include <unistd.h>
  37 # undef __need_getopt
  38 # undef getopt
  39 # undef getopt_long
  40 # undef getopt_long_only
  41 # undef optarg
  42 # undef opterr
  43 # undef optind
  44 # undef optopt
  45 # define __GETOPT_CONCAT(x, y) x ## y
  46 # define __GETOPT_XCONCAT(x, y) __GETOPT_CONCAT (x, y)
  47 # define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
  48 # define getopt __GETOPT_ID (getopt)
  49 # define getopt_long __GETOPT_ID (getopt_long)
  50 # define getopt_long_only __GETOPT_ID (getopt_long_only)
  51 # define optarg __GETOPT_ID (optarg)
  52 # define opterr __GETOPT_ID (opterr)
  53 # define optind __GETOPT_ID (optind)
  54 # define optopt __GETOPT_ID (optopt)
  55 #endif
  56
  57 /* Standalone applications get correct prototypes for getopt_long and
  58    getopt_long_only; they declare "char **argv".  libc uses prototypes
  59    with "char *const *argv" that are incorrect because getopt_long and
  60    getopt_long_only can permute argv; this is required for backward
  61    compatibility (e.g., for LSB 2.0.1).
  62
  63    This used to be `#if defined __GETOPT_PREFIX && !defined __need_getopt',
  64    but it caused redefinition warnings if both unistd.h and getopt.h were
  65    included, since unistd.h includes getopt.h having previously defined
  66    __need_getopt.
  67
  68    The only place where __getopt_argv_const is used is in definitions
  69    of getopt_long and getopt_long_only below, but these are visible
  70    only if __need_getopt is not defined, so it is quite safe to rewrite
  71    the conditional as follows:
  72 */
  73 #if !defined __need_getopt
  74 # if defined __GETOPT_PREFIX
  75 #  define __getopt_argv_const /* empty */
  76 # else
  77 #  define __getopt_argv_const const
  78 # endif
  79 #endif
  80
  81 /* If __GNU_LIBRARY__ is not already defined, either we are being used
  82    standalone, or this is the first header included in the source file.
  83    If we are being used with glibc, we need to include <features.h>, but
  84    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
  85    not defined, include <ctype.h>, which will pull in <features.h> for us
  86    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
  87    doesn't flood the namespace with stuff the way some other headers do.)  */
  88 #if !defined __GNU_LIBRARY__
  89 # include <ctype.h>
  90 #endif
  91
  92 #ifndef __THROW
  93 # ifndef __GNUC_PREREQ
  94 #  define __GNUC_PREREQ(maj, min) (0)
  95 # endif
  96 # if defined __cplusplus && __GNUC_PREREQ (2,8)
  97 #  define __THROW       throw ()
  98 # else
  99 #  define __THROW
 100 # endif
 101 #endif
 102
 103 #ifdef __cplusplus
 104 extern "C" {
 105 #endif
 106
 107 /* For communication from `getopt' to the caller.
 108    When `getopt' finds an option that takes an argument,
 109    the argument value is returned here.
 110    Also, when `ordering' is RETURN_IN_ORDER,
 111    each non-option ARGV-element is returned here.  */
 112
 113 extern char *optarg;
 114
 115 /* Index in ARGV of the next element to be scanned.
 116    This is used for communication to and from the caller
 117    and for communication between successive calls to `getopt'.
 118
 119    On entry to `getopt', zero means this is the first call; initialize.
 120
 121    When `getopt' returns -1, this is the index of the first of the
 122    non-option elements that the caller should itself scan.
 123
 124    Otherwise, `optind' communicates from one call to the next
 125    how much of ARGV has been scanned so far.  */
 126
 127 extern int optind;
 128
 129 /* Callers store zero here to inhibit the error message `getopt' prints
 130    for unrecognized options.  */
 131
 132 extern int opterr;
 133
 134 /* Set to an option character which was unrecognized.  */
 135
 136 extern int optopt;
 137
 138 #ifndef __need_getopt
 139 /* Describe the long-named options requested by the application.
 140    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
 141    of `struct option' terminated by an element containing a name which is
 142    zero.
 143
 144    The field `has_arg' is:
 145    no_argument          (or 0) if the option does not take an argument,
 146    required_argument    (or 1) if the option requires an argument,
 147    optional_argument    (or 2) if the option takes an optional argument.
 148
 149    If the field `flag' is not NULL, it points to a variable that is set
 150    to the value given in the field `val' when the option is found, but
 151    left unchanged if the option is not found.
 152
 153    To have a long-named option do something other than set an `int' to
 154    a compiled-in constant, such as set a value from `optarg', set the
 155    option's `flag' field to zero and its `val' field to a nonzero
 156    value (the equivalent single-letter option character, if there is
 157    one).  For long options that have a zero `flag' field, `getopt'
 158    returns the contents of the `val' field.  */
 159
 160 struct option
 161 {
 162   const char *name;
 163   /* has_arg can't be an enum because some compilers complain about
 164      type mismatches in all the code that assumes it is an int.  */
 165   int has_arg;
 166   int *flag;
 167   int val;
 168 };
 169
 170 /* Names for the values of the `has_arg' field of `struct option'.  */
 171
 172 # define no_argument            0
 173 # define required_argument      1
 174 # define optional_argument      2
 175 #endif  /* need getopt */
 176
 177
 178 /* Get definitions and prototypes for functions to process the
 179    arguments in ARGV (ARGC of them, minus the program name) for
 180    options given in OPTS.
 181
 182    Return the option character from OPTS just read.  Return -1 when
 183    there are no more options.  For unrecognized options, or options
 184    missing arguments, `optopt' is set to the option letter, and '?' is
 185    returned.
 186
 187    The OPTS string is a list of characters which are recognized option
 188    letters, optionally followed by colons, specifying that that letter
 189    takes an argument, to be placed in `optarg'.
 190
 191    If a letter in OPTS is followed by two colons, its argument is
 192    optional.  This behavior is specific to the GNU `getopt'.
 193
 194    The argument `--' causes premature termination of argument
 195    scanning, explicitly telling `getopt' that there are no more
 196    options.
 197
 198    If OPTS begins with `-', then non-option arguments are treated as
 199    arguments to the option '\1'.  This behavior is specific to the GNU
 200    `getopt'.  If OPTS begins with `+', or POSIXLY_CORRECT is set in
 201    the environment, then do not permute arguments.  */
 202
 203 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
 204        __THROW;
 205
 206 #ifndef __need_getopt
 207 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
 208                         const char *__shortopts,
 209                         const struct option *__longopts, int *__longind)
 210        __THROW;
 211 extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
 212                              const char *__shortopts,
 213                              const struct option *__longopts, int *__longind)
 214        __THROW;
 215
 216 #endif
 217
 218 #ifdef __cplusplus
 219 }
 220 #endif
 221
 222 /* Make sure we later can get all the definitions and declarations.  */
 223 #undef __need_getopt
 224
 225 #endif /* getopt.h */