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Diffstat (limited to 'gnu/lib/libg++/include/GetOpt.h')
-rw-r--r-- | gnu/lib/libg++/include/GetOpt.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/gnu/lib/libg++/include/GetOpt.h b/gnu/lib/libg++/include/GetOpt.h new file mode 100644 index 0000000..66ecf5c --- /dev/null +++ b/gnu/lib/libg++/include/GetOpt.h @@ -0,0 +1,129 @@ +/* Getopt for GNU. + Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. + (Modified by Douglas C. Schmidt for use with GNU G++.) + +This file is part of the GNU C++ Library. This library is free +software; you can redistribute it and/or modify it under the terms of +the GNU Library General Public License as published by the Free +Software Foundation; either version 2 of the License, or (at your +option) any later version. This 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 Library General Public License for more details. +You should have received a copy of the GNU Library General Public +License along with this library; if not, write to the Free Software +Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + + +/* This version of `getopt' appears to the caller like standard Unix `getopt' + but it behaves differently for the user, since it allows the user + to intersperse the options with the other arguments. + + As `getopt' works, it permutes the elements of `argv' so that, + when it is done, all the options precede everything else. Thus + all application programs are extended to handle flexible argument order. + + Setting the environment variable _POSIX_OPTION_ORDER disables permutation. + Then the behavior is completely standard. + + GNU application programs can use a third alternative mode in which + they can distinguish the relative order of options and other arguments. */ + +#ifndef GetOpt_h +#ifdef __GNUG__ +#pragma interface +#endif +#define GetOpt_h 1 + +#include <std.h> +#include <stdio.h> + +class GetOpt +{ +private: + /* The next char to be scanned in the option-element + in which the last option character we returned was found. + This allows us to pick up the scan where we left off. + + If this is zero, or a null string, it means resume the scan + by advancing to the next ARGV-element. */ + + static char *nextchar; + + + /* Describe how to deal with options that follow non-option ARGV-elements. + + UNSPECIFIED means the caller did not specify anything; + the default is then REQUIRE_ORDER if the environment variable + _OPTIONS_FIRST is defined, PERMUTE otherwise. + + REQUIRE_ORDER means don't recognize them as options. + Stop option processing when the first non-option is seen. + This is what Unix does. + + PERMUTE is the default. We permute the contents of `argv' as we scan, + so that eventually all the options are at the end. This allows options + to be given in any order, even with programs that were not written to + expect this. + + RETURN_IN_ORDER is an option available to programs that were written + to expect options and other ARGV-elements in any order and that care about + the ordering of the two. We describe each non-option ARGV-element + as if it were the argument of an option with character code zero. + Using `-' as the first character of the list of option characters + requests this mode of operation. + + The special argument `--' forces an end of option-scanning regardless + of the value of `ordering'. In the case of RETURN_IN_ORDER, only + `--' can cause `getopt' to return EOF with `optind' != ARGC. */ + + enum OrderingEnum { REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER }; + OrderingEnum ordering; + + /* Handle permutation of arguments. */ + + /* Describe the part of ARGV that contains non-options that have + been skipped. `first_nonopt' is the index in ARGV of the first of them; + `last_nonopt' is the index after the last of them. */ + + static int first_nonopt; + static int last_nonopt; + + void exchange (char **argv); +public: + /* 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. */ + + 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 EOF, 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. */ + + int optind; + + /* Callers store zero here to inhibit the error message + for unrecognized options. */ + + int opterr; + + int nargc; + char **nargv; + const char *noptstring; + + GetOpt (int argc, char **argv, const char *optstring); + int operator () (void); +}; + +#endif |