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A Windows/Linux library for enabling terminal settings and driving character-by-character input.

License: Apache License 2.0

Ada 100.00%
command-line terminal

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trendy_terminal's Issues

macOS investigation

Well, I just have to try macOS!

Looking at trendy_terminal-linux.ads, I think the treatment of c_lflag_t and Local_Flags is confusing if not wrong.

The representations of c_lflag_t (which are mask values) look as thought they ought to be octal, not hex? (values 1, 2, 4, 10 ...) - but Local_Flags is an array indexed by the position, not the representation, so that ECHO is bit 3, as it should be (on Linux).

On macOS, things are different (order, missing values):

    for c_lflag_t use
      (
       ECHOKE     => 16#00000001#,
       ECHOE      => 16#00000002#,
       ECHOK      => 16#00000004#,
       ECHO       => 16#00000008#,
       ECHONL     => 16#00000010#,
       ECHOPRT    => 16#00000020#,
       ECHOCTL    => 16#00000040#,
       ISIG       => 16#00000080#,
       ICANON     => 16#00000100#,
       ALTWERASE  => 16#00000200#,
       IEXTEN     => 16#00000400#,
       EXTPROC    => 16#00000800#,
       TOSTOP     => 16#00400000#,
       FLUSHO     => 16#00800000#,
       NOKERNINFO => 16#02000000#,
       PENDIN     => 16#20000000#,
       NOFLSH     => 16#80000000#
      );

I know we don’t use the last 4, so we could use the current scheme, but I’ve seen a NOKERNINFO in the wild. I’ve gone for e.g. in Set

        case Setting is
           when Platform.Echo =>
               Std_Input.Settings.c_lflag :=
                 Std_Input.Settings.c_lflag and not Macos.ECHO'Enum_Rep;
               if Enabled then
                   Std_Input.Settings.c_lflag :=
                     Std_Input.Settings.c_lflag or Macos.ECHO'Enum_Rep;
               end if;

Anyway, I spent a long time before noticing that termios.h says

typedef unsigned long   tcflag_t;
typedef unsigned char   cc_t;
typedef unsigned long   speed_t;

and on macOS unsigned long is 8 bytes, so the Ada has to be unsigned_long:

    NCCS : constant := 20;
    type tcflag_t is new Interfaces.C.unsigned_long;
    type cc_t is new Interfaces.C.unsigned_char;
    type speed_t is new Interfaces.C.unsigned_long;
    type cc_array is array (Natural range 0 .. NCCS - 1) of cc_t;

On macOS, I couldn't say

    stdin  : aliased FILE_Ptr;
    stdout : aliased FILE_Ptr;
    stderr : aliased FILE_Ptr;

    pragma Import (C, stdin, "stdin");
    pragma Import (C, stdout, "stdout");
    pragma Import (C, stderr, "stderr");

because the symbol _stdin (I think the underscore was there). After delving into the GNAT runtime, I came up with

    function Gnat_Constant_Stdin return FILE_Ptr with
        Import        => True,
        Convention    => C,
        External_Name => "__gnat_constant_stdin";
    function Gnat_Constant_Stdout return FILE_Ptr with
        Import        => True,
        Convention    => C,
        External_Name => "__gnat_constant_stdout";
    function Gnat_Constant_Stderr return FILE_Ptr with
        Import        => True,
        Convention    => C,
        External_Name => "__gnat_constant_stderr";

    stdin  : aliased FILE_Ptr := Gnat_Constant_Stdin;
    stdout : aliased FILE_Ptr := Gnat_Constant_Stdout;
    stderr : aliased FILE_Ptr := Gnat_Constant_Stderr;

(ugh)

[Crash] Debug get-line

Debug_Get_Line crashes if this is not set:

Trendy_Terminal.Set (Trendy_Terminal.Echo, False);
Trendy_Terminal.Set (Trendy_Terminal.Line_Input, False);
Trendy_Terminal.Set (Trendy_Terminal.Escape_Sequences, True);

raised CONSTRAINT_ERROR : bad input for 'Value: ""
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ad49812 at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ad49bbe at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ad47e76 at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ad47f54 at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ac4fa00 at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ac5071a at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ac2e1b8 at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ac2e7c6 at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ab9176b at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ab92560 at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ab91422 at ???
[D:\dev\ada\septum\bin\septum.exe]
0x7ff66ab9113b at ???
[C:\Windows\System32\KERNEL32.DLL]
0x7ff81b617032
[C:\Windows\SYSTEM32\ntdll.dll]
0x7ff81cb2264f

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