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Diffstat (limited to 'ncurses-5.3/Ada95/samples/ncurses2-getopt.adb')
| -rw-r--r-- | ncurses-5.3/Ada95/samples/ncurses2-getopt.adb | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/ncurses-5.3/Ada95/samples/ncurses2-getopt.adb b/ncurses-5.3/Ada95/samples/ncurses2-getopt.adb new file mode 100644 index 0000000..306c44d --- /dev/null +++ b/ncurses-5.3/Ada95/samples/ncurses2-getopt.adb @@ -0,0 +1,168 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT ncurses Binding Samples -- +-- -- +-- ncurses -- +-- -- +-- B O D Y -- +-- -- +------------------------------------------------------------------------------ +-- Copyright (c) 2000 Free Software Foundation, Inc. -- +-- -- +-- Permission is hereby granted, free of charge, to any person obtaining a -- +-- copy of this software and associated documentation files (the -- +-- "Software"), to deal in the Software without restriction, including -- +-- without limitation the rights to use, copy, modify, merge, publish, -- +-- distribute, distribute with modifications, sublicense, and/or sell -- +-- copies of the Software, and to permit persons to whom the Software is -- +-- furnished to do so, subject to the following conditions: -- +-- -- +-- The above copyright notice and this permission notice shall be included -- +-- in all copies or substantial portions of the Software. -- +-- -- +-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS -- +-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF -- +-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. -- +-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, -- +-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR -- +-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR -- +-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. -- +-- -- +-- Except as contained in this notice, the name(s) of the above copyright -- +-- holders shall not be used in advertising or otherwise to promote the -- +-- sale, use or other dealings in this Software without prior written -- +-- authorization. -- +------------------------------------------------------------------------------ +-- Author: Eugene V. Melaragno <aldomel@ix.netcom.com> 2000 +-- Version Control +-- $Revision$ +-- Binding Version 01.00 +------------------------------------------------------------------------------ +-- A simplified version of the GNU getopt function +-- copyright Free Software Foundtion + +with Ada.Strings.Fixed; +with Ada.Strings.Bounded; +with Ada.Text_IO; use Ada.Text_IO; + +package body ncurses2.getopt is + + opterr : Character := Character'Val (1); + optopt : Character := '?'; + initialized : Boolean := False; + + nextchar : Natural := 0; + + -- Ncurses doesn't use the non option elements so we are spared + -- the job of computing those. + + -- also the user is not allowed to modify argv or argc + -- Doing so is Erroneous execution. + + -- longoptions are not handled. + + procedure Qgetopt (retval : out Integer; + argc : Integer; + argv : stringfunc; + -- argv will be the Argument function. + optstring : String; + optind : in out Integer; + -- ignored for ncurses, must be initialized to 1 by + -- the caller + Optarg : out stringa + -- a garbage colector would be useful here. + ) is + + package BS is new Ada.Strings.Bounded.Generic_Bounded_Length (200); + use BS; + optargx : Bounded_String; + begin + + if argc < optind then + retval := -1; + return; + end if; + + optargx := To_Bounded_String (""); + + if nextchar = 0 then + + if argv (optind) = "--" then + -- the rest are non-options, we ignore them + retval := -1; + return; + end if; + + if argv (optind)(1) /= '-' or argv (optind)'Length = 1 then + optind := optind + 1; + Optarg := new String'(argv (optind)); + retval := 1; + return; + end if; + + nextchar := 2; -- skip the one hyphen. + end if; + + -- Look at and handle the next short option-character. + declare + c : Character := argv (optind) (nextchar); + temp : Natural := + Ada.Strings.Fixed.Index (optstring, String'(1 => c)); + begin + if temp = 0 or c = ':' then + Put_Line (Standard_Error, + argv (optind) & ": invalid option -- " & c); + optopt := c; + c := '?'; + return; + end if; + + if optstring (temp + 1) = ':' then + if optstring (temp + 2) = ':' then + -- This is an option that accepts an argument optionally. + if nextchar /= argv (optind)'Length then + optargx := To_Bounded_String + (argv (optind) (nextchar .. argv (optind)'Length)); + else + Optarg := null; + end if; + else + -- This is an option that requires an argument. + if nextchar /= argv (optind)'Length then + optargx := To_Bounded_String + (argv (optind) (nextchar .. argv (optind)'Length)); + optind := optind + 1; + elsif optind = argc then + Put_Line (Standard_Error, + argv (optind) & + ": option requires an argument -- " & c); + optopt := c; + if optstring (1) = ':' then + c := ':'; + else + c := '?'; + end if; + else + -- increment it again when taking next ARGV-elt as argument. + optind := optind + 1; + optargx := To_Bounded_String (argv (optind)); + optind := optind + 1; + end if; + end if; + nextchar := 0; + else -- no argument for the option + if nextchar = argv (optind)'Length then + optind := optind + 1; + nextchar := 0; + else + nextchar := nextchar + 1; + end if; + end if; + + retval := Character'Pos (c); + Optarg := new String'(To_String (optargx)); + return; + end; + end Qgetopt; + +end ncurses2.getopt; |