gl/getopt.in.h

   1 /* Declarations for getopt.
   2    Copyright (C) 1989-1994, 1996-1999, 2001, 2003-2007, 2009-2012 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 #  include <stdlib.h>
  53 #  include <stdio.h>
  54 #  include <unistd.h>
  55 # endif
  56 # undef __need_getopt
  57 # undef getopt
  58 # undef getopt_long
  59 # undef getopt_long_only
  60 # undef optarg
  61 # undef opterr
  62 # undef optind
  63 # undef optopt
  64 # undef option
  65 # define __GETOPT_CONCAT(x, y) x ## y
  66 # define __GETOPT_XCONCAT(x, y) __GETOPT_CONCAT (x, y)
  67 # define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
  68 # define getopt __GETOPT_ID (getopt)
  69 # define getopt_long __GETOPT_ID (getopt_long)
  70 # define getopt_long_only __GETOPT_ID (getopt_long_only)
  71 # define optarg __GETOPT_ID (optarg)
  72 # define opterr __GETOPT_ID (opterr)
  73 # define optind __GETOPT_ID (optind)
  74 # define optopt __GETOPT_ID (optopt)
  75 # define option __GETOPT_ID (option)
  76 # define _getopt_internal __GETOPT_ID (getopt_internal)
  77 #endif
  78
  79 /* Standalone applications get correct prototypes for getopt_long and
  80    getopt_long_only; they declare "char **argv".  libc uses prototypes
  81    with "char *const *argv" that are incorrect because getopt_long and
  82    getopt_long_only can permute argv; this is required for backward
  83    compatibility (e.g., for LSB 2.0.1).
  84
  85    This used to be '#if defined __GETOPT_PREFIX && !defined __need_getopt',
  86    but it caused redefinition warnings if both unistd.h and getopt.h were
  87    included, since unistd.h includes getopt.h having previously defined
  88    __need_getopt.
  89
  90    The only place where __getopt_argv_const is used is in definitions
  91    of getopt_long and getopt_long_only below, but these are visible
  92    only if __need_getopt is not defined, so it is quite safe to rewrite
  93    the conditional as follows:
  94 */
  95 #if !defined __need_getopt
  96 # if defined __GETOPT_PREFIX
  97 #  define __getopt_argv_const /* empty */
  98 # else
  99 #  define __getopt_argv_const const
 100 # endif
 101 #endif
 102
 103 /* If __GNU_LIBRARY__ is not already defined, either we are being used
 104    standalone, or this is the first header included in the source file.
 105    If we are being used with glibc, we need to include <features.h>, but
 106    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
 107    not defined, include <ctype.h>, which will pull in <features.h> for us
 108    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
 109    doesn't flood the namespace with stuff the way some other headers do.)  */
 110 #if !defined __GNU_LIBRARY__
 111 # include <ctype.h>
 112 #endif
 113
 114 #ifndef __THROW
 115 # ifndef __GNUC_PREREQ
 116 #  define __GNUC_PREREQ(maj, min) (0)
 117 # endif
 118 # if defined __cplusplus && __GNUC_PREREQ (2,8)
 119 #  define __THROW       throw ()
 120 # else
 121 #  define __THROW
 122 # endif
 123 #endif
 124
 125 /* The definition of _GL_ARG_NONNULL is copied here.  */
 126
 127 #ifdef __cplusplus
 128 extern "C" {
 129 #endif
 130
 131 /* For communication from 'getopt' to the caller.
 132    When 'getopt' finds an option that takes an argument,
 133    the argument value is returned here.
 134    Also, when 'ordering' is RETURN_IN_ORDER,
 135    each non-option ARGV-element is returned here.  */
 136
 137 extern char *optarg;
 138
 139 /* Index in ARGV of the next element to be scanned.
 140    This is used for communication to and from the caller
 141    and for communication between successive calls to 'getopt'.
 142
 143    On entry to 'getopt', zero means this is the first call; initialize.
 144
 145    When 'getopt' returns -1, this is the index of the first of the
 146    non-option elements that the caller should itself scan.
 147
 148    Otherwise, 'optind' communicates from one call to the next
 149    how much of ARGV has been scanned so far.  */
 150
 151 extern int optind;
 152
 153 /* Callers store zero here to inhibit the error message 'getopt' prints
 154    for unrecognized options.  */
 155
 156 extern int opterr;
 157
 158 /* Set to an option character which was unrecognized.  */
 159
 160 extern int optopt;
 161
 162 #ifndef __need_getopt
 163 /* Describe the long-named options requested by the application.
 164    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
 165    of 'struct option' terminated by an element containing a name which is
 166    zero.
 167
 168    The field 'has_arg' is:
 169    no_argument          (or 0) if the option does not take an argument,
 170    required_argument    (or 1) if the option requires an argument,
 171    optional_argument    (or 2) if the option takes an optional argument.
 172
 173    If the field 'flag' is not NULL, it points to a variable that is set
 174    to the value given in the field 'val' when the option is found, but
 175    left unchanged if the option is not found.
 176
 177    To have a long-named option do something other than set an 'int' to
 178    a compiled-in constant, such as set a value from 'optarg', set the
 179    option's 'flag' field to zero and its 'val' field to a nonzero
 180    value (the equivalent single-letter option character, if there is
 181    one).  For long options that have a zero 'flag' field, 'getopt'
 182    returns the contents of the 'val' field.  */
 183
 184 # if !GNULIB_defined_struct_option
 185 struct option
 186 {
 187   const char *name;
 188   /* has_arg can't be an enum because some compilers complain about
 189      type mismatches in all the code that assumes it is an int.  */
 190   int has_arg;
 191   int *flag;
 192   int val;
 193 };
 194 #  define GNULIB_defined_struct_option 1
 195 # endif
 196
 197 /* Names for the values of the 'has_arg' field of 'struct option'.  */
 198
 199 # define no_argument            0
 200 # define required_argument      1
 201 # define optional_argument      2
 202 #endif  /* need getopt */
 203
 204
 205 /* Get definitions and prototypes for functions to process the
 206    arguments in ARGV (ARGC of them, minus the program name) for
 207    options given in OPTS.
 208
 209    Return the option character from OPTS just read.  Return -1 when
 210    there are no more options.  For unrecognized options, or options
 211    missing arguments, 'optopt' is set to the option letter, and '?' is
 212    returned.
 213
 214    The OPTS string is a list of characters which are recognized option
 215    letters, optionally followed by colons, specifying that that letter
 216    takes an argument, to be placed in 'optarg'.
 217
 218    If a letter in OPTS is followed by two colons, its argument is
 219    optional.  This behavior is specific to the GNU 'getopt'.
 220
 221    The argument '--' causes premature termination of argument
 222    scanning, explicitly telling 'getopt' that there are no more
 223    options.
 224
 225    If OPTS begins with '-', then non-option arguments are treated as
 226    arguments to the option '\1'.  This behavior is specific to the GNU
 227    'getopt'.  If OPTS begins with '+', or POSIXLY_CORRECT is set in
 228    the environment, then do not permute arguments.  */
 229
 230 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
 231        __THROW _GL_ARG_NONNULL ((2, 3));
 232
 233 #ifndef __need_getopt
 234 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
 235                         const char *__shortopts,
 236                         const struct option *__longopts, int *__longind)
 237        __THROW _GL_ARG_NONNULL ((2, 3));
 238 extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
 239                              const char *__shortopts,
 240                              const struct option *__longopts, int *__longind)
 241        __THROW _GL_ARG_NONNULL ((2, 3));
 242
 243 #endif
 244
 245 #ifdef __cplusplus
 246 }
 247 #endif
 248
 249 /* Make sure we later can get all the definitions and declarations.  */
 250 #undef __need_getopt
 251
 252 #endif /* _@GUARD_PREFIX@_GETOPT_H */
 253 #endif /* _@GUARD_PREFIX@_GETOPT_H */