1 ------------------------------------------------------------------------------
3 -- GNAT ncurses Binding --
5 -- Terminal_Interface.Curses.Forms.Field_Types --
9 ------------------------------------------------------------------------------
10 -- Copyright (c) 1998 Free Software Foundation, Inc. --
12 -- Permission is hereby granted, free of charge, to any person obtaining a --
13 -- copy of this software and associated documentation files (the --
14 -- "Software"), to deal in the Software without restriction, including --
15 -- without limitation the rights to use, copy, modify, merge, publish, --
16 -- distribute, distribute with modifications, sublicense, and/or sell --
17 -- copies of the Software, and to permit persons to whom the Software is --
18 -- furnished to do so, subject to the following conditions: --
20 -- The above copyright notice and this permission notice shall be included --
21 -- in all copies or substantial portions of the Software. --
23 -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS --
24 -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --
25 -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --
26 -- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, --
27 -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR --
28 -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR --
29 -- THE USE OR OTHER DEALINGS IN THE SOFTWARE. --
31 -- Except as contained in this notice, the name(s) of the above copyright --
32 -- holders shall not be used in advertising or otherwise to promote the --
33 -- sale, use or other dealings in this Software without prior written --
35 ------------------------------------------------------------------------------
36 -- Author: Juergen Pfeifer, 1996
37 -- Contact: http://www.familiepfeifer.de/Contact.aspx?Lang=en
40 -- Binding Version 01.00
41 ------------------------------------------------------------------------------
43 with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;
44 with Ada.Unchecked_Deallocation;
45 with Ada.Unchecked_Conversion;
47 -- |=====================================================================
48 -- | man page form_fieldtype.3x
49 -- |=====================================================================
51 package body Terminal_Interface.Curses.Forms.Field_Types is
53 use type Interfaces.C.int;
54 use type System.Address;
56 function To_Argument_Access is new Ada.Unchecked_Conversion
57 (System.Address, Argument_Access);
59 function Get_Fieldtype (F : Field) return C_Field_Type;
60 pragma Import (C, Get_Fieldtype, "field_type");
62 function Get_Arg (F : Field) return System.Address;
63 pragma Import (C, Get_Arg, "field_arg");
65 -- |=====================================================================
66 -- | man page form_field_validation.3x
67 -- |=====================================================================
71 function Get_Type (Fld : in Field) return Field_Type_Access
73 Low_Level : constant C_Field_Type := Get_Fieldtype (Fld);
74 Arg : Argument_Access;
76 if Low_Level = Null_Field_Type then
79 if Low_Level = M_Builtin_Router or else
80 Low_Level = M_Generic_Type or else
81 Low_Level = M_Choice_Router or else
82 Low_Level = M_Generic_Choice then
83 Arg := To_Argument_Access (Get_Arg (Fld));
95 function Make_Arg (Args : System.Address) return System.Address
97 -- Actually args is a double indirected pointer to the arguments
98 -- of a C variable argument list. In theory it is now quite
99 -- complicated to write portable routine that reads the arguments,
100 -- because one has to know the growth direction of the stack and
101 -- the sizes of the individual arguments.
102 -- Fortunately we are only interested in the first argument (#0),
103 -- we know its size and for the first arg we don't care about
104 -- into which stack direction we have to proceed. We simply
105 -- resolve the double indirection and thats it.
106 type V is access all System.Address;
107 function To_Access is new Ada.Unchecked_Conversion (System.Address,
110 return To_Access (To_Access (Args).all).all;
113 function Copy_Arg (Usr : System.Address) return System.Address
119 procedure Free_Arg (Usr : in System.Address)
121 procedure Free_Type is new Ada.Unchecked_Deallocation
122 (Field_Type'Class, Field_Type_Access);
123 procedure Freeargs is new Ada.Unchecked_Deallocation
124 (Argument, Argument_Access);
126 To_Be_Free : Argument_Access := To_Argument_Access (Usr);
127 Low_Level : C_Field_Type;
129 if To_Be_Free /= null then
130 if To_Be_Free.Usr /= System.Null_Address then
131 Low_Level := To_Be_Free.Cft;
132 if Low_Level.Freearg /= null then
133 Low_Level.Freearg (To_Be_Free.Usr);
136 if To_Be_Free.Typ /= null then
137 Free_Type (To_Be_Free.Typ);
139 Freeargs (To_Be_Free);
144 procedure Wrap_Builtin (Fld : Field;
145 Typ : Field_Type'Class;
146 Cft : C_Field_Type := C_Builtin_Router)
148 Usr_Arg : System.Address := Get_Arg (Fld);
149 Low_Level : constant C_Field_Type := Get_Fieldtype (Fld);
150 Arg : Argument_Access;
152 function Set_Fld_Type (F : Field := Fld;
153 Cf : C_Field_Type := Cft;
154 Arg1 : Argument_Access) return C_Int;
155 pragma Import (C, Set_Fld_Type, "set_field_type");
158 pragma Assert (Low_Level /= Null_Field_Type);
159 if Cft /= C_Builtin_Router and then Cft /= C_Choice_Router then
160 raise Form_Exception;
162 Arg := new Argument'(Usr => System.Null_Address,
163 Typ => new Field_Type'Class'(Typ),
164 Cft => Get_Fieldtype (Fld));
165 if Usr_Arg /= System.Null_Address then
166 if Low_Level.Copyarg /= null then
167 Arg.Usr := Low_Level.Copyarg (Usr_Arg);
173 Res := Set_Fld_Type (Arg1 => Arg);
180 function Field_Check_Router (Fld : Field;
181 Usr : System.Address) return C_Int
183 Arg : constant Argument_Access := To_Argument_Access (Usr);
185 pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type
186 and then Arg.Typ /= null);
187 if Arg.Cft.Fcheck /= null then
188 return Arg.Cft.Fcheck (Fld, Arg.Usr);
192 end Field_Check_Router;
194 function Char_Check_Router (Ch : C_Int;
195 Usr : System.Address) return C_Int
197 Arg : constant Argument_Access := To_Argument_Access (Usr);
199 pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type
200 and then Arg.Typ /= null);
201 if Arg.Cft.Ccheck /= null then
202 return Arg.Cft.Ccheck (Ch, Arg.Usr);
206 end Char_Check_Router;
208 function Next_Router (Fld : Field;
209 Usr : System.Address) return C_Int
211 Arg : constant Argument_Access := To_Argument_Access (Usr);
213 pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type
214 and then Arg.Typ /= null);
215 if Arg.Cft.Next /= null then
216 return Arg.Cft.Next (Fld, Arg.Usr);
222 function Prev_Router (Fld : Field;
223 Usr : System.Address) return C_Int
225 Arg : constant Argument_Access := To_Argument_Access (Usr);
227 pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type
228 and then Arg.Typ /= null);
229 if Arg.Cft.Prev /= null then
230 return Arg.Cft.Prev (Fld, Arg.Usr);
236 -- -----------------------------------------------------------------------
238 function C_Builtin_Router return C_Field_Type
243 if M_Builtin_Router = Null_Field_Type then
244 T := New_Fieldtype (Field_Check_Router'Access,
245 Char_Check_Router'Access);
246 if T = Null_Field_Type then
247 raise Form_Exception;
249 Res := Set_Fieldtype_Arg (T,
257 M_Builtin_Router := T;
259 pragma Assert (M_Builtin_Router /= Null_Field_Type);
260 return M_Builtin_Router;
261 end C_Builtin_Router;
263 -- -----------------------------------------------------------------------
265 function C_Choice_Router return C_Field_Type
270 if M_Choice_Router = Null_Field_Type then
271 T := New_Fieldtype (Field_Check_Router'Access,
272 Char_Check_Router'Access);
273 if T = Null_Field_Type then
274 raise Form_Exception;
276 Res := Set_Fieldtype_Arg (T,
284 Res := Set_Fieldtype_Choice (T,
291 M_Choice_Router := T;
293 pragma Assert (M_Choice_Router /= Null_Field_Type);
294 return M_Choice_Router;
297 end Terminal_Interface.Curses.Forms.Field_Types;