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getopt.h

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00001 /* from http://www.pwilson.net/getopt.html */
-00002 
-00003 /* getopt.h */
-00004 /* Declarations for getopt.
-00005    Copyright (C) 1989-1994, 1996-1999, 2001 Free Software 
-00006    Foundation, Inc. This file is part of the GNU C Library.
-00007 
-00008    The GNU C Library is free software; you can redistribute 
-00009    it and/or modify it under the terms of the GNU Lesser 
-00010    General Public License as published by the Free Software 
-00011    Foundation; either version 2.1 of the License, or 
-00012    (at your option) any later version.
-00013 
-00014    The GNU C Library is distributed in the hope that it will 
-00015    be useful, but WITHOUT ANY WARRANTY; without even the 
-00016    implied warranty of MERCHANTABILITY or FITNESS FOR A 
-00017    PARTICULAR PURPOSE.  See the GNU Lesser General Public 
-00018    License for more details.
-00019 
-00020    You should have received a copy of the GNU Lesser General 
-00021    Public License along with the GNU C Library; if not, write 
-00022    to the Free Software Foundation, Inc., 59 Temple Place,
-00023    Suite 330, Boston, MA 02111-1307 USA.  */
-00024 
-00025   
-00026 
-00027   
-00028 
-00029 #ifndef _GETOPT_H
-00030 
-00031 #ifndef __need_getopt
-00032 # define _GETOPT_H 1
-00033 #endif
-00034 
-00035 /* If __GNU_LIBRARY__ is not already defined, either we are being used
-00036    standalone, or this is the first header included in the source file.
-00037    If we are being used with glibc, we need to include <features.h>, but
-00038    that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
-00039    not defined, include <ctype.h>, which will pull in <features.h> for us
-00040    if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
-00041    doesn't flood the namespace with stuff the way some other headers do.)  */
-00042 #if !defined __GNU_LIBRARY__
-00043 # include <ctype.h>
-00044 #endif
-00045 
-00046 #ifdef  __cplusplus
-00047 extern "C" {
-00048 #endif
-00049 
-00050 /* For communication from `getopt' to the caller.
-00051    When `getopt' finds an option that takes an argument,
-00052    the argument value is returned here.
-00053    Also, when `ordering' is RETURN_IN_ORDER,
-00054    each non-option ARGV-element is returned here.  */
-00055 
-00056 extern char *optarg;
-00057 
-00058 /* Index in ARGV of the next element to be scanned.
-00059    This is used for communication to and from the caller
-00060    and for communication between successive calls to `getopt'.
-00061 
-00062    On entry to `getopt', zero means this is the first call; initialize.
-00063 
-00064    When `getopt' returns -1, this is the index of the first of the
-00065    non-option elements that the caller should itself scan.
-00066 
-00067    Otherwise, `optind' communicates from one call to the next
-00068    how much of ARGV has been scanned so far.  */
-00069 
-00070 extern int optind;
-00071 
-00072 /* Callers store zero here to inhibit the error message `getopt' prints
-00073    for unrecognized options.  */
-00074 
-00075 extern int opterr;
-00076 
-00077 /* Set to an option character which was unrecognized.  */
-00078 
-00079 extern int optopt;
-00080 
-00081 #ifndef __need_getopt
-00082 /* Describe the long-named options requested by the application.
-00083    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
-00084    of `struct option' terminated by an element containing a name which is
-00085    zero.
-00086 
-00087    The field `has_arg' is:
-00088    no_argument          (or 0) if the option does not take an argument,
-00089    required_argument    (or 1) if the option requires an argument,
-00090    optional_argument    (or 2) if the option takes an optional argument.
-00091 
-00092    If the field `flag' is not NULL, it points to a variable that is set
-00093    to the value given in the field `val' when the option is found, but
-00094    left unchanged if the option is not found.
-00095 
-00096    To have a long-named option do something other than set an `int' to
-00097    a compiled-in constant, such as set a value from `optarg', set the
-00098    option's `flag' field to zero and its `val' field to a nonzero
-00099    value (the equivalent single-letter option character, if there is
-00100    one).  For long options that have a zero `flag' field, `getopt'
-00101    returns the contents of the `val' field.  */
-00102 
-00103 struct option
-00104 {
-00105 # if (defined __STDC__ && __STDC__) || defined __cplusplus
-00106   const char *name;
-00107 # else
-00108   char *name;
-00109 # endif
-00110   /* has_arg can't be an enum because some compilers complain about
-00111      type mismatches in all the code that assumes it is an int.  */
-00112   int has_arg;
-00113   int *flag;
-00114   int val;
-00115 };
-00116 
-00117 /* Names for the values of the `has_arg' field of `struct option'.  */
-00118 
-00119 # define no_argument            0
-00120 # define required_argument      1
-00121 # define optional_argument      2
-00122 #endif  /* need getopt */
-00123 
-00124 
-00125 /* Get definitions and prototypes for functions to process the
-00126    arguments in ARGV (ARGC of them, minus the program name) for
-00127    options given in OPTS.
-00128 
-00129    Return the option character from OPTS just read.  Return -1 when
-00130    there are no more options.  For unrecognized options, or options
-00131    missing arguments, `optopt' is set to the option letter, and '?' is
-00132    returned.
-00133 
-00134    The OPTS string is a list of characters which are recognized option
-00135    letters, optionally followed by colons, specifying that that letter
-00136    takes an argument, to be placed in `optarg'.
-00137 
-00138    If a letter in OPTS is followed by two colons, its argument is
-00139    optional.  This behavior is specific to the GNU `getopt'.
-00140 
-00141    The argument `--' causes premature termination of argument
-00142    scanning, explicitly telling `getopt' that there are no more
-00143    options.
-00144 
-00145    If OPTS begins with `--', then non-option arguments are treated as
-00146    arguments to the option '\0'.  This behavior is specific to the GNU
-00147    `getopt'.  */
-00148 
-00149 #if (defined __STDC__ && __STDC__) || defined __cplusplus
-00150 # ifdef __GNU_LIBRARY__
-00151 /* Many other libraries have conflicting prototypes for getopt, with
-00152    differences in the consts, in stdlib.h.  To avoid compilation
-00153    errors, only prototype getopt for the GNU C library.  */
-00154 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts);
-00155 # else /* not __GNU_LIBRARY__ */
-00156 extern int getopt ();
-00157 # endif /* __GNU_LIBRARY__ */
-00158 
-00159 # ifndef __need_getopt
-00160 extern int getopt_long (int ___argc, char *const *___argv,
-00161                         const char *__shortopts,
-00162                         const struct option *__longopts, int *__longind);
-00163 extern int getopt_long_only (int ___argc, char *const *___argv,
-00164                              const char *__shortopts,
-00165                              const struct option *__longopts, int *__longind);
-00166 
-00167 /* Internal only.  Users should not call this directly.  */
-00168 extern int _getopt_internal (int ___argc, char *const *___argv,
-00169                              const char *__shortopts,
-00170                              const struct option *__longopts, int *__longind,
-00171                              int __long_only);
-00172 # endif
-00173 #else /* not __STDC__ */
-00174 extern int getopt ();
-00175 # ifndef __need_getopt
-00176 extern int getopt_long ();
-00177 extern int getopt_long_only ();
-00178 
-00179 extern int _getopt_internal ();
-00180 # endif
-00181 #endif /* __STDC__ */
-00182 
-00183 #ifdef  __cplusplus
-00184 }
-00185 #endif
-00186 
-00187 /* Make sure we later can get all the definitions and declarations.  */
-00188 #undef __need_getopt
-00189 
-00190 #endif /* getopt.h */
-00191 
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