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(* GetOpt.mod allows users to manage long options to getopt.
Copyright (C) 2017-2025 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 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
General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE GetOpt ; (*!m2pim+gm2*)
FROM DynamicStrings IMPORT string, InitStringCharStar ;
FROM Storage IMPORT ALLOCATE, REALLOCATE, DEALLOCATE ;
FROM MemUtils IMPORT MemCopy ;
IMPORT cgetopt ;
TYPE
LongOptions = POINTER TO RECORD
cptr: cgetopt.Options
END ;
(*
GetOpt - call C getopt and fill in the parameters:
optarg, optind, opterr and optop.
*)
PROCEDURE GetOpt (argc: INTEGER; argv: ADDRESS; optstring: String;
VAR optarg: String;
VAR optind, opterr, optopt: INTEGER) : CHAR ;
VAR
r: CHAR ;
BEGIN
r := cgetopt.getopt (argc, argv, string (optstring)) ;
optarg := InitStringCharStar (cgetopt.optarg) ;
opterr := cgetopt.opterr ;
optopt := cgetopt.optopt ;
RETURN r
END GetOpt ;
(*
InitLongOptions - creates and returns a LongOptions empty array.
*)
PROCEDURE InitLongOptions () : LongOptions ;
VAR
lo: LongOptions ;
BEGIN
NEW (lo) ;
WITH lo^ DO
cptr := cgetopt.InitOptions ()
END ;
RETURN lo
END InitLongOptions ;
(*
AddLongOption - appends long option {name, has_arg, flag, val} to the
array of options and new long options array is returned.
The old array, lo, should no longer be used.
(from man 3 getopt)
The meanings of the different fields are:
name is the name of the long option.
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; or optional_argument (or 2) if the
option takes an optional argument.
flag specifies how results are returned for a long option. If flag is NULL, then
getopt_long() returns val. (For example, the calling program may set val to the
equivalent short option character.) Otherwise, getopt_long() returns 0, and flag
points to a variable which is set to val if the option is found, but left unchanged
if the option is not found.
val is the value to return, or to load into the variable pointed to by flag.
The last element of the array must be filled with zeros.
*)
PROCEDURE AddLongOption (lo: LongOptions; index: CARDINAL;
name: String; has_arg: INTEGER;
VAR flag: INTEGER; val: INTEGER) : LongOptions ;
BEGIN
cgetopt.SetOption (lo^.cptr, index, name, has_arg, flag, val) ;
RETURN lo
END AddLongOption ;
(*
KillLongOptions - returns NIL and also frees up memory associated with, lo.
*)
PROCEDURE KillLongOptions (lo: LongOptions) : LongOptions ;
BEGIN
lo^.cptr := cgetopt.KillOptions (lo^.cptr) ;
DISPOSE (lo) ;
RETURN NIL
END KillLongOptions ;
(*
GetOptLong - works like GetOpt but will accept long options (using two dashes).
If the program only accepts long options then optstring should be
an empty string, not NIL.
*)
PROCEDURE GetOptLong (argc: INTEGER; argv: ADDRESS; optstring: String;
longopts: LongOptions; VAR longindex: INTEGER) : INTEGER ;
BEGIN
RETURN cgetopt.getopt_long (argc, argv, string (optstring),
cgetopt.GetLongOptionArray (longopts^.cptr), longindex)
END GetOptLong ;
(*
GetOptLongOnly - works like GetOptLong except that a single dash can be used
for a long option.
*)
PROCEDURE GetOptLongOnly (argc: INTEGER; argv: ADDRESS; optstring: String;
longopts: LongOptions; VAR longindex: INTEGER) : INTEGER ;
BEGIN
RETURN cgetopt.getopt_long_only (argc, argv, string (optstring),
cgetopt.GetLongOptionArray (longopts^.cptr), longindex)
END GetOptLongOnly ;
END GetOpt.
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