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Edit File: getopt.h

/* Declarations for getopt. Copyright (C) 1989-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _GETOPT_H #ifndef __need_getopt # define _GETOPT_H 1 #endif /* If __GNU_LIBRARY__ is not already defined, either we are being used standalone, or this is the first header included in the source file. If we are being used with glibc, we need to include <features.h>, but that does not exist if we are standalone. So: if __GNU_LIBRARY__ is not defined, include <ctype.h>, which will pull in <features.h> for us if it's from glibc. (Why ctype.h? It's guaranteed to exist and it doesn't flood the namespace with stuff the way some other headers do.) */ #if !defined __GNU_LIBRARY__ # include <ctype.h> #endif #ifndef __THROW # ifndef __GNUC_PREREQ # define __GNUC_PREREQ(maj, min) (0) # endif # if defined __cplusplus && __GNUC_PREREQ (2,8) # define __THROW throw () # else # define __THROW # endif #endif #ifdef __cplusplus extern "C" { #endif /* For communication from `getopt' to the caller. When `getopt' finds an option that takes an argument, the argument value is returned here. Also, when `ordering' is RETURN_IN_ORDER, each non-option ARGV-element is returned here. */ extern char *optarg; /* Index in ARGV of the next element to be scanned. This is used for communication to and from the caller and for communication between successive calls to `getopt'. On entry to `getopt', zero means this is the first call; initialize. When `getopt' returns -1, this is the index of the first of the non-option elements that the caller should itself scan. Otherwise, `optind' communicates from one call to the next how much of ARGV has been scanned so far. */ extern int optind; /* Callers store zero here to inhibit the error message `getopt' prints for unrecognized options. */ extern int opterr; /* Set to an option character which was unrecognized. */ extern int optopt; #ifndef __need_getopt /* Describe the long-named options requested by the application. The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector of `struct option' terminated by an element containing a name which is zero. The field `has_arg' is: no_argument (or 0) if the option does not take an argument, required_argument (or 1) if the option requires an argument, optional_argument (or 2) if the option takes an optional argument. If the field `flag' is not NULL, it points to a variable that is set to the value given in the field `val' when the option is found, but left unchanged if the option is not found. To have a long-named option do something other than set an `int' to a compiled-in constant, such as set a value from `optarg', set the option's `flag' field to zero and its `val' field to a nonzero value (the equivalent single-letter option character, if there is one). For long options that have a zero `flag' field, `getopt' returns the contents of the `val' field. */ struct option { const char *name; /* has_arg can't be an enum because some compilers complain about type mismatches in all the code that assumes it is an int. */ int has_arg; int *flag; int val; }; /* Names for the values of the `has_arg' field of `struct option'. */ # define no_argument 0 # define required_argument 1 # define optional_argument 2 #endif /* need getopt */ /* Get definitions and prototypes for functions to process the arguments in ARGV (ARGC of them, minus the program name) for options given in OPTS. Return the option character from OPTS just read. Return -1 when there are no more options. For unrecognized options, or options missing arguments, `optopt' is set to the option letter, and '?' is returned. The OPTS string is a list of characters which are recognized option letters, optionally followed by colons, specifying that that letter takes an argument, to be placed in `optarg'. If a letter in OPTS is followed by two colons, its argument is optional. This behavior is specific to the GNU `getopt'. The argument `--' causes premature termination of argument scanning, explicitly telling `getopt' that there are no more options. If OPTS begins with `--', then non-option arguments are treated as arguments to the option '\0'. This behavior is specific to the GNU `getopt'. */ #ifdef __GNU_LIBRARY__ /* Many other libraries have conflicting prototypes for getopt, with differences in the consts, in stdlib.h. To avoid compilation errors, only prototype getopt for the GNU C library. */ extern int getopt (int ___argc, char *const *___argv, const char *__shortopts) __THROW; # if defined __need_getopt && defined __USE_POSIX2 \ && !defined __USE_POSIX_IMPLICITLY && !defined __USE_GNU /* The GNU getopt has more functionality than the standard version. The additional functionality can be disable at runtime. This redirection helps to also do this at runtime. */ # ifdef __REDIRECT extern int __REDIRECT_NTH (getopt, (int ___argc, char *const *___argv, const char *__shortopts), __posix_getopt); # else extern int __posix_getopt (int ___argc, char *const *___argv, const char *__shortopts) __THROW; # define getopt __posix_getopt # endif # endif #else /* not __GNU_LIBRARY__ */ extern int getopt (); #endif /* __GNU_LIBRARY__ */ #ifndef __need_getopt extern int getopt_long (int ___argc, char *const *___argv, const char *__shortopts, const struct option *__longopts, int *__longind) __THROW; extern int getopt_long_only (int ___argc, char *const *___argv, const char *__shortopts, const struct option *__longopts, int *__longind) __THROW; #endif #ifdef __cplusplus } #endif /* Make sure we later can get all the definitions and declarations. */ #undef __need_getopt #endif /* getopt.h */