lib/getopt.in.h

   1 /* Declarations for getopt.
   2    Copyright (C) 1989-1994, 1996-1999, 2001, 2003-2007, 2009-2016 Free Software
   3    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 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 General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _@GUARD_PREFIX@_GETOPT_H
  20
  21 #if __GNUC__ >= 3
  22 @PRAGMA_SYSTEM_HEADER@
  23 #endif
  24 @PRAGMA_COLUMNS@
  25
  26 /* The include_next requires a split double-inclusion guard.  We must
  27    also inform the replacement unistd.h to not recursively use
  28    <getopt.h>; our definitions will be present soon enough.  */
  29 #if @HAVE_GETOPT_H@
  30 # define _GL_SYSTEM_GETOPT
  31 # @INCLUDE_NEXT@ @NEXT_GETOPT_H@
  32 # undef _GL_SYSTEM_GETOPT
  33 #endif
  34
  35 #ifndef _@GUARD_PREFIX@_GETOPT_H
  36
  37 #ifndef __need_getopt
  38 # define _@GUARD_PREFIX@_GETOPT_H 1
  39 #endif
  40
  41 /* Standalone applications should #define __GETOPT_PREFIX to an
  42    identifier that prefixes the external functions and variables
  43    defined in this header.  When this happens, include the
  44    headers that might declare getopt so that they will not cause
  45    confusion if included after this file (if the system had <getopt.h>,
  46    we have already included it).  Then systematically rename
  47    identifiers so that they do not collide with the system functions
  48    and variables.  Renaming avoids problems with some compilers and
  49    linkers.  */
  50 #if defined __GETOPT_PREFIX && !defined __need_getopt
  51 # if !@HAVE_GETOPT_H@
  52 #  define __need_system_stdlib_h
  53 #  include <stdlib.h>
  54 #  undef __need_system_stdlib_h
  55 #  include <stdio.h>
  56 #  include <unistd.h>
  57 # endif
  58 # undef __need_getopt
  59 # undef getopt
  60 # undef getopt_long
  61 # undef getopt_long_only
  62 # undef optarg
  63 # undef opterr
  64 # undef optind
  65 # undef optopt
  66 # undef option
  67 # define __GETOPT_CONCAT(x, y) x ## y
  68 # define __GETOPT_XCONCAT(x, y) __GETOPT_CONCAT (x, y)
  69 # define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
  70 # define getopt __GETOPT_ID (getopt)
  71 # define getopt_long __GETOPT_ID (getopt_long)
  72 # define getopt_long_only __GETOPT_ID (getopt_long_only)
  73 # define optarg __GETOPT_ID (optarg)
  74 # define opterr __GETOPT_ID (opterr)
  75 # define optind __GETOPT_ID (optind)
  76 # define optopt __GETOPT_ID (optopt)
  77 # define option __GETOPT_ID (option)
  78 # define _getopt_internal __GETOPT_ID (getopt_internal)
  79 #endif
  80
  81 /* Standalone applications get correct prototypes for getopt_long and
  82    getopt_long_only; they declare "char **argv".  libc uses prototypes
  83    with "char *const *argv" that are incorrect because getopt_long and
  84    getopt_long_only can permute argv; this is required for backward
  85    compatibility (e.g., for LSB 2.0.1).
  86
  87    This used to be '#if defined __GETOPT_PREFIX && !defined __need_getopt',
  88    but it caused redefinition warnings if both unistd.h and getopt.h were
  89    included, since unistd.h includes getopt.h having previously defined
  90    __need_getopt.
  91
  92    The only place where __getopt_argv_const is used is in definitions
  93    of getopt_long and getopt_long_only below, but these are visible
  94    only if __need_getopt is not defined, so it is quite safe to rewrite
  95    the conditional as follows:
  96 */
  97 #if !defined __need_getopt
  98 # if defined __GETOPT_PREFIX
  99 #  define __getopt_argv_const /* empty */
 100 # else
 101 #  define __getopt_argv_const const
 102 # endif
 103 #endif
 104
 105 /* If __GNU_LIBRARY__ is not already defined, either we are being used
 106    standalone, or this is the first header included in the source file.
 107    If we are being used with glibc, we need to include <features.h>, but
 108    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
 109    not defined, include <ctype.h>, which will pull in <features.h> for us
 110    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
 111    doesn't flood the namespace with stuff the way some other headers do.)  */
 112 #if !defined __GNU_LIBRARY__
 113 # include <ctype.h>
 114 #endif
 115
 116 #ifndef __THROW
 117 # ifndef __GNUC_PREREQ
 118 #  define __GNUC_PREREQ(maj, min) (0)
 119 # endif
 120 # if defined __cplusplus && __GNUC_PREREQ (2,8)
 121 #  define __THROW       throw ()
 122 # else
 123 #  define __THROW
 124 # endif
 125 #endif
 126
 127 /* The definition of _GL_ARG_NONNULL is copied here.  */
 128
 129 #ifdef __cplusplus
 130 extern "C" {
 131 #endif
 132
 133 /* For communication from 'getopt' to the caller.
 134    When 'getopt' finds an option that takes an argument,
 135    the argument value is returned here.
 136    Also, when 'ordering' is RETURN_IN_ORDER,
 137    each non-option ARGV-element is returned here.  */
 138
 139 extern char *optarg;
 140
 141 /* Index in ARGV of the next element to be scanned.
 142    This is used for communication to and from the caller
 143    and for communication between successive calls to 'getopt'.
 144
 145    On entry to 'getopt', zero means this is the first call; initialize.
 146
 147    When 'getopt' returns -1, this is the index of the first of the
 148    non-option elements that the caller should itself scan.
 149
 150    Otherwise, 'optind' communicates from one call to the next
 151    how much of ARGV has been scanned so far.  */
 152
 153 extern int optind;
 154
 155 /* Callers store zero here to inhibit the error message 'getopt' prints
 156    for unrecognized options.  */
 157
 158 extern int opterr;
 159
 160 /* Set to an option character which was unrecognized.  */
 161
 162 extern int optopt;
 163
 164 #ifndef __need_getopt
 165 /* Describe the long-named options requested by the application.
 166    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
 167    of 'struct option' terminated by an element containing a name which is
 168    zero.
 169
 170    The field 'has_arg' is:
 171    no_argument          (or 0) if the option does not take an argument,
 172    required_argument    (or 1) if the option requires an argument,
 173    optional_argument    (or 2) if the option takes an optional argument.
 174
 175    If the field 'flag' is not NULL, it points to a variable that is set
 176    to the value given in the field 'val' when the option is found, but
 177    left unchanged if the option is not found.
 178
 179    To have a long-named option do something other than set an 'int' to
 180    a compiled-in constant, such as set a value from 'optarg', set the
 181    option's 'flag' field to zero and its 'val' field to a nonzero
 182    value (the equivalent single-letter option character, if there is
 183    one).  For long options that have a zero 'flag' field, 'getopt'
 184    returns the contents of the 'val' field.  */
 185
 186 # if !GNULIB_defined_struct_option
 187 struct option
 188 {
 189   const char *name;
 190   /* has_arg can't be an enum because some compilers complain about
 191      type mismatches in all the code that assumes it is an int.  */
 192   int has_arg;
 193   int *flag;
 194   int val;
 195 };
 196 #  define GNULIB_defined_struct_option 1
 197 # endif
 198
 199 /* Names for the values of the 'has_arg' field of 'struct option'.  */
 200
 201 # define no_argument            0
 202 # define required_argument      1
 203 # define optional_argument      2
 204 #endif  /* need getopt */
 205
 206
 207 /* Get definitions and prototypes for functions to process the
 208    arguments in ARGV (ARGC of them, minus the program name) for
 209    options given in OPTS.
 210
 211    Return the option character from OPTS just read.  Return -1 when
 212    there are no more options.  For unrecognized options, or options
 213    missing arguments, 'optopt' is set to the option letter, and '?' is
 214    returned.
 215
 216    The OPTS string is a list of characters which are recognized option
 217    letters, optionally followed by colons, specifying that that letter
 218    takes an argument, to be placed in 'optarg'.
 219
 220    If a letter in OPTS is followed by two colons, its argument is
 221    optional.  This behavior is specific to the GNU 'getopt'.
 222
 223    The argument '--' causes premature termination of argument
 224    scanning, explicitly telling 'getopt' that there are no more
 225    options.
 226
 227    If OPTS begins with '-', then non-option arguments are treated as
 228    arguments to the option '\1'.  This behavior is specific to the GNU
 229    'getopt'.  If OPTS begins with '+', or POSIXLY_CORRECT is set in
 230    the environment, then do not permute arguments.  */
 231
 232 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
 233        __THROW _GL_ARG_NONNULL ((2, 3));
 234
 235 #ifndef __need_getopt
 236 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
 237                         const char *__shortopts,
 238                         const struct option *__longopts, int *__longind)
 239        __THROW _GL_ARG_NONNULL ((2, 3));
 240 extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
 241                              const char *__shortopts,
 242                              const struct option *__longopts, int *__longind)
 243        __THROW _GL_ARG_NONNULL ((2, 3));
 244
 245 #endif
 246
 247 #ifdef __cplusplus
 248 }
 249 #endif
 250
 251 /* Make sure we later can get all the definitions and declarations.  */
 252 #undef __need_getopt
 253
 254 #endif /* _@GUARD_PREFIX@_GETOPT_H */
 255 #endif /* _@GUARD_PREFIX@_GETOPT_H */