File : terminal_interface-curses-terminfo.adb
with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;
with Interfaces.C; use Interfaces.C;
with Interfaces.C.Strings; use Interfaces.C.Strings;
with Ada.Unchecked_Conversion;
package body Terminal_Interface.Curses.Terminfo is
function Is_MinusOne_Pointer (P : chars_ptr) return Boolean;
function Is_MinusOne_Pointer (P : chars_ptr) return Boolean is
type Weird_Address is new System.Storage_Elements.Integer_Address;
Invalid_Pointer : constant Weird_Address := -1;
function To_Weird is new Ada.Unchecked_Conversion
(Source => chars_ptr, Target => Weird_Address);
begin
if To_Weird (P) = Invalid_Pointer then
return True;
else
return False;
end if;
end Is_MinusOne_Pointer;
pragma Inline (Is_MinusOne_Pointer);
function Get_Flag (Name : String) return Boolean
is
function tigetflag (id : char_array) return Curses_Bool;
pragma Import (C, tigetflag);
Txt : char_array (0 .. Name'Length);
Length : size_t;
begin
To_C (Name, Txt, Length);
if tigetflag (Txt) = Curses_Bool (Curses_True) then
return True;
else
return False;
end if;
end Get_Flag;
procedure Get_String (Name : String;
Value : out Terminfo_String;
Result : out Boolean)
is
function tigetstr (id : char_array) return chars_ptr;
pragma Import (C, tigetstr, "tigetstr");
Txt : char_array (0 .. Name'Length);
Length : size_t;
Txt2 : chars_ptr;
begin
To_C (Name, Txt, Length);
Txt2 := tigetstr (Txt);
if Txt2 = Null_Ptr then
Result := False;
elsif Is_MinusOne_Pointer (Txt2) then
raise Curses_Exception;
else
Value := Terminfo_String (Fill_String (Txt2));
Result := True;
end if;
end Get_String;
function Has_String (Name : String) return Boolean
is
function tigetstr (id : char_array) return chars_ptr;
pragma Import (C, tigetstr, "tigetstr");
Txt : char_array (0 .. Name'Length);
Length : size_t;
Txt2 : chars_ptr;
begin
To_C (Name, Txt, Length);
Txt2 := tigetstr (Txt);
if Txt2 = Null_Ptr then
return False;
elsif Is_MinusOne_Pointer (Txt2) then
raise Curses_Exception;
else
return True;
end if;
end Has_String;
function Get_Number (Name : String) return Integer is
function tigetstr (s : char_array) return C_Int;
pragma Import (C, tigetstr);
Txt : char_array (0 .. Name'Length);
Length : size_t;
begin
To_C (Name, Txt, Length);
return Integer (tigetstr (Txt));
end Get_Number;
procedure Put_String (Str : Terminfo_String;
affcnt : Natural := 1;
putc : putctype := null) is
function tputs (str : char_array;
affcnt : C_Int;
putc : putctype) return C_Int;
function putp (str : char_array) return C_Int;
pragma Import (C, tputs);
pragma Import (C, putp);
Txt : char_array (0 .. Str'Length);
Length : size_t;
Err : C_Int;
begin
To_C (String (Str), Txt, Length);
if putc = null then
Err := putp (Txt);
else
Err := tputs (Txt, C_Int (affcnt), putc);
end if;
if Err = Curses_Err then
raise Curses_Exception;
end if;
end Put_String;
end Terminal_Interface.Curses.Terminfo;