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gnugetopt.h

    00001 /* Declarations for getopt.
    00002    Copyright (C) 1989-1994, 1996-1999, 2001 Free Software Foundation, Inc.
    00003    This file is part of the GNU C Library.
    00004
    00005    The GNU C Library is free software; you can redistribute it and/or
    00006    modify it under the terms of the GNU Lesser General Public
    00007    License as published by the Free Software Foundation; either
    00008    version 2.1 of the License, or (at your option) any later version.
    00009
    00010    The GNU C Library is distributed in the hope that it will be useful,
    00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013    Lesser General Public License for more details.
    00014
    00015    You should have received a copy of the GNU Lesser General Public
    00016    License along with the GNU C Library; if not, write to the Free
    00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    00018    02111-1307 USA.  */
    00019
    00020 #ifndef _GETOPT_H
    00021
    00022 #ifndef __need_getopt
    00023 # define _GETOPT_H 1
    00024 #endif
    00025
    00026 /* If __GNU_LIBRARY__ is not already defined, either we are being used
    00027    standalone, or this is the first header included in the source file.
    00028    If we are being used with glibc, we need to include <features.h>, but
    00029    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
    00030    not defined, include <ctype.h>, which will pull in <features.h> for us
    00031    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
    00032    doesn't flood the namespace with stuff the way some other headers do.)  */
    00033 #if !defined __GNU_LIBRARY__
    00034 # include <ctype.h>
    00035 #endif
    00036
    00037 #ifdef  __cplusplus
    00038 extern "C" {
    00039 #endif
    00040
    00041 /* For communication from `getopt' to the caller.
    00042    When `getopt' finds an option that takes an argument,
    00043    the argument value is returned here.
    00044    Also, when `ordering' is RETURN_IN_ORDER,
    00045    each non-option ARGV-element is returned here.  */
    00046
    00047 extern char *optarg;
    00048
    00049 /* Index in ARGV of the next element to be scanned.
    00050    This is used for communication to and from the caller
    00051    and for communication between successive calls to `getopt'.
    00052
    00053    On entry to `getopt', zero means this is the first call; initialize.
    00054
    00055    When `getopt' returns -1, this is the index of the first of the
    00056    non-option elements that the caller should itself scan.
    00057
    00058    Otherwise, `optind' communicates from one call to the next
    00059    how much of ARGV has been scanned so far.  */
    00060
    00061 extern int optind;
    00062
    00063 /* Callers store zero here to inhibit the error message `getopt' prints
    00064    for unrecognized options.  */
    00065
    00066 extern int opterr;
    00067
    00068 /* Set to an option character which was unrecognized.  */
    00069
    00070 extern int optopt;
    00071
    00072 #ifndef __need_getopt
    00073 /* Describe the long-named options requested by the application.
    00074    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
    00075    of `struct option' terminated by an element containing a name which is
    00076    zero.
    00077
    00078    The field `has_arg' is:
    00079    no_argument          (or 0) if the option does not take an argument,
    00080    required_argument    (or 1) if the option requires an argument,
    00081    optional_argument    (or 2) if the option takes an optional argument.
    00082
    00083    If the field `flag' is not NULL, it points to a variable that is set
    00084    to the value given in the field `val' when the option is found, but
    00085    left unchanged if the option is not found.
    00086
    00087    To have a long-named option do something other than set an `int' to
    00088    a compiled-in constant, such as set a value from `optarg', set the
    00089    option's `flag' field to zero and its `val' field to a nonzero
    00090    value (the equivalent single-letter option character, if there is
    00091    one).  For long options that have a zero `flag' field, `getopt'
    00092    returns the contents of the `val' field.  */
    00093
    00094 struct option
    00095 {
    00096 # if (defined __STDC__ && __STDC__) || defined __cplusplus
    00097   const char *name;
    00098 # else
    00099   char *name;
    00100 # endif
    00101   /* has_arg can't be an enum because some compilers complain about
    00102      type mismatches in all the code that assumes it is an int.  */
    00103   int has_arg;
    00104   int *flag;
    00105   int val;
    00106 };
    00107
    00108 /* Names for the values of the `has_arg' field of `struct option'.  */
    00109
    00110 # define no_argument            0
    00111 # define required_argument      1
    00112 # define optional_argument      2
    00113 #endif  /* need getopt */
    00114
    00115
    00116 /* Get definitions and prototypes for functions to process the
    00117    arguments in ARGV (ARGC of them, minus the program name) for
    00118    options given in OPTS.
    00119
    00120    Return the option character from OPTS just read.  Return -1 when
    00121    there are no more options.  For unrecognized options, or options
    00122    missing arguments, `optopt' is set to the option letter, and '?' is
    00123    returned.
    00124
    00125    The OPTS string is a list of characters which are recognized option
    00126    letters, optionally followed by colons, specifying that that letter
    00127    takes an argument, to be placed in `optarg'.
    00128
    00129    If a letter in OPTS is followed by two colons, its argument is
    00130    optional.  This behavior is specific to the GNU `getopt'.
    00131
    00132    The argument `--' causes premature termination of argument
    00133    scanning, explicitly telling `getopt' that there are no more
    00134    options.
    00135
    00136    If OPTS begins with `--', then non-option arguments are treated as
    00137    arguments to the option '\0'.  This behavior is specific to the GNU
    00138    `getopt'.  */
    00139
    00140 #if (defined __STDC__ && __STDC__) || defined __cplusplus
    00141 # ifdef __GNU_LIBRARY__
    00142 /* Many other libraries have conflicting prototypes for getopt, with
    00143    differences in the consts, in stdlib.h.  To avoid compilation
    00144    errors, only prototype getopt for the GNU C library.  */
    00145 extern int getopt (int __argc, char *const *__argv, const char *__shortopts);
    00146 # else /* not __GNU_LIBRARY__ */
    00147 extern int getopt ();
    00148 # endif /* __GNU_LIBRARY__ */
    00149
    00150 # ifndef __need_getopt
    00151 extern int getopt_long (int __argc, char *const *__argv, const char *__shortopts,
    00152                         const struct option *__longopts, int *__longind);
    00153 extern int getopt_long_only (int __argc, char *const *__argv,
    00154                              const char *__shortopts,
    00155                              const struct option *__longopts, int *__longind);
    00156
    00157 /* Internal only.  Users should not call this directly.  */
    00158 extern int _getopt_internal (int __argc, char *const *__argv,
    00159                              const char *__shortopts,
    00160                              const struct option *__longopts, int *__longind,
    00161                              int __long_only);
    00162 # endif
    00163 #else /* not __STDC__ */
    00164 extern int getopt ();
    00165 # ifndef __need_getopt
    00166 extern int getopt_long ();
    00167 extern int getopt_long_only ();
    00168
    00169 extern int _getopt_internal ();
    00170 # endif
    00171 #endif /* __STDC__ */
    00172
    00173 #ifdef  __cplusplus
    00174 }
    00175 #endif
    00176
    00177 /* Make sure we later can get all the definitions and declarations.  */
    00178 #undef __need_getopt
    00179
    00180 #endif /* getopt.h */