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Diffstat (limited to 'ncurses-5.3/Ada95/src/terminal_interface-curses-forms-field_types.adb')
| -rw-r--r-- | ncurses-5.3/Ada95/src/terminal_interface-curses-forms-field_types.adb | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/ncurses-5.3/Ada95/src/terminal_interface-curses-forms-field_types.adb b/ncurses-5.3/Ada95/src/terminal_interface-curses-forms-field_types.adb new file mode 100644 index 0000000..69c9c98 --- /dev/null +++ b/ncurses-5.3/Ada95/src/terminal_interface-curses-forms-field_types.adb @@ -0,0 +1,297 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT ncurses Binding -- +-- -- +-- Terminal_Interface.Curses.Forms.Field_Types -- +-- -- +-- B O D Y -- +-- -- +------------------------------------------------------------------------------ +-- Copyright (c) 1998 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: Juergen Pfeifer, 1996 +-- Contact: http://www.familiepfeifer.de/Contact.aspx?Lang=en +-- Version Control: +-- $Revision$ +-- Binding Version 01.00 +------------------------------------------------------------------------------ +with Interfaces.C; +with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux; +with Ada.Unchecked_Deallocation; +with Ada.Unchecked_Conversion; +-- | +-- |===================================================================== +-- | man page form_fieldtype.3x +-- |===================================================================== +-- | +package body Terminal_Interface.Curses.Forms.Field_Types is + + use type Interfaces.C.int; + use type System.Address; + + function To_Argument_Access is new Ada.Unchecked_Conversion + (System.Address, Argument_Access); + + function Get_Fieldtype (F : Field) return C_Field_Type; + pragma Import (C, Get_Fieldtype, "field_type"); + + function Get_Arg (F : Field) return System.Address; + pragma Import (C, Get_Arg, "field_arg"); + -- | + -- |===================================================================== + -- | man page form_field_validation.3x + -- |===================================================================== + -- | + -- | + -- | + function Get_Type (Fld : in Field) return Field_Type_Access + is + Low_Level : constant C_Field_Type := Get_Fieldtype (Fld); + Arg : Argument_Access; + begin + if Low_Level = Null_Field_Type then + return null; + else + if Low_Level = M_Builtin_Router or else + Low_Level = M_Generic_Type or else + Low_Level = M_Choice_Router or else + Low_Level = M_Generic_Choice then + Arg := To_Argument_Access (Get_Arg (Fld)); + if Arg = null then + raise Form_Exception; + else + return Arg.Typ; + end if; + else + raise Form_Exception; + end if; + end if; + end Get_Type; + + function Make_Arg (Args : System.Address) return System.Address + is + -- Actually args is a double indirected pointer to the arguments + -- of a C variable argument list. In theory it is now quite + -- complicated to write portable routine that reads the arguments, + -- because one has to know the growth direction of the stack and + -- the sizes of the individual arguments. + -- Fortunately we are only interested in the first argument (#0), + -- we know its size and for the first arg we don't care about + -- into which stack direction we have to proceed. We simply + -- resolve the double indirection and thats it. + type V is access all System.Address; + function To_Access is new Ada.Unchecked_Conversion (System.Address, + V); + begin + return To_Access (To_Access (Args).all).all; + end Make_Arg; + + function Copy_Arg (Usr : System.Address) return System.Address + is + begin + return Usr; + end Copy_Arg; + + procedure Free_Arg (Usr : in System.Address) + is + procedure Free_Type is new Ada.Unchecked_Deallocation + (Field_Type'Class, Field_Type_Access); + procedure Freeargs is new Ada.Unchecked_Deallocation + (Argument, Argument_Access); + + To_Be_Free : Argument_Access := To_Argument_Access (Usr); + Low_Level : C_Field_Type; + begin + if To_Be_Free /= null then + if To_Be_Free.Usr /= System.Null_Address then + Low_Level := To_Be_Free.Cft; + if Low_Level.Freearg /= null then + Low_Level.Freearg (To_Be_Free.Usr); + end if; + end if; + if To_Be_Free.Typ /= null then + Free_Type (To_Be_Free.Typ); + end if; + Freeargs (To_Be_Free); + end if; + end Free_Arg; + + + procedure Wrap_Builtin (Fld : Field; + Typ : Field_Type'Class; + Cft : C_Field_Type := C_Builtin_Router) + is + Usr_Arg : System.Address := Get_Arg (Fld); + Low_Level : constant C_Field_Type := Get_Fieldtype (Fld); + Arg : Argument_Access; + Res : Eti_Error; + function Set_Fld_Type (F : Field := Fld; + Cf : C_Field_Type := Cft; + Arg1 : Argument_Access) return C_Int; + pragma Import (C, Set_Fld_Type, "set_field_type"); + + begin + pragma Assert (Low_Level /= Null_Field_Type); + if Cft /= C_Builtin_Router and then Cft /= C_Choice_Router then + raise Form_Exception; + else + Arg := new Argument'(Usr => System.Null_Address, + Typ => new Field_Type'Class'(Typ), + Cft => Get_Fieldtype (Fld)); + if Usr_Arg /= System.Null_Address then + if Low_Level.Copyarg /= null then + Arg.Usr := Low_Level.Copyarg (Usr_Arg); + else + Arg.Usr := Usr_Arg; + end if; + end if; + + Res := Set_Fld_Type (Arg1 => Arg); + if Res /= E_Ok then + Eti_Exception (Res); + end if; + end if; + end Wrap_Builtin; + + function Field_Check_Router (Fld : Field; + Usr : System.Address) return C_Int + is + Arg : constant Argument_Access := To_Argument_Access (Usr); + begin + pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type + and then Arg.Typ /= null); + if Arg.Cft.Fcheck /= null then + return Arg.Cft.Fcheck (Fld, Arg.Usr); + else + return 1; + end if; + end Field_Check_Router; + + function Char_Check_Router (Ch : C_Int; + Usr : System.Address) return C_Int + is + Arg : constant Argument_Access := To_Argument_Access (Usr); + begin + pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type + and then Arg.Typ /= null); + if Arg.Cft.Ccheck /= null then + return Arg.Cft.Ccheck (Ch, Arg.Usr); + else + return 1; + end if; + end Char_Check_Router; + + function Next_Router (Fld : Field; + Usr : System.Address) return C_Int + is + Arg : constant Argument_Access := To_Argument_Access (Usr); + begin + pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type + and then Arg.Typ /= null); + if Arg.Cft.Next /= null then + return Arg.Cft.Next (Fld, Arg.Usr); + else + return 1; + end if; + end Next_Router; + + function Prev_Router (Fld : Field; + Usr : System.Address) return C_Int + is + Arg : constant Argument_Access := To_Argument_Access (Usr); + begin + pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type + and then Arg.Typ /= null); + if Arg.Cft.Prev /= null then + return Arg.Cft.Prev (Fld, Arg.Usr); + else + return 1; + end if; + end Prev_Router; + + -- ----------------------------------------------------------------------- + -- + function C_Builtin_Router return C_Field_Type + is + Res : Eti_Error; + T : C_Field_Type; + begin + if M_Builtin_Router = Null_Field_Type then + T := New_Fieldtype (Field_Check_Router'Access, + Char_Check_Router'Access); + if T = Null_Field_Type then + raise Form_Exception; + else + Res := Set_Fieldtype_Arg (T, + Make_Arg'Access, + Copy_Arg'Access, + Free_Arg'Access); + if Res /= E_Ok then + Eti_Exception (Res); + end if; + end if; + M_Builtin_Router := T; + end if; + pragma Assert (M_Builtin_Router /= Null_Field_Type); + return M_Builtin_Router; + end C_Builtin_Router; + + -- ----------------------------------------------------------------------- + -- + function C_Choice_Router return C_Field_Type + is + Res : Eti_Error; + T : C_Field_Type; + begin + if M_Choice_Router = Null_Field_Type then + T := New_Fieldtype (Field_Check_Router'Access, + Char_Check_Router'Access); + if T = Null_Field_Type then + raise Form_Exception; + else + Res := Set_Fieldtype_Arg (T, + Make_Arg'Access, + Copy_Arg'Access, + Free_Arg'Access); + if Res /= E_Ok then + Eti_Exception (Res); + end if; + + Res := Set_Fieldtype_Choice (T, + Next_Router'Access, + Prev_Router'Access); + if Res /= E_Ok then + Eti_Exception (Res); + end if; + end if; + M_Choice_Router := T; + end if; + pragma Assert (M_Choice_Router /= Null_Field_Type); + return M_Choice_Router; + end C_Choice_Router; + +end Terminal_Interface.Curses.Forms.Field_Types; |