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-- CXAF001.A

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--*

--

-- OBJECTIVE:

--      Check that an implementation supports the functionality defined

--      in Package Ada.Command_Line.

--

-- TEST DESCRIPTION:

--      This test verifies that an implementation supports the subprograms

--      contained in package Ada.Command_Line.  Each of the subprograms

--      is exercised in a general sense, to ensure that it is available,

--      and that it provides the prescribed results in a known test

--      environment.  Function Argument_Count must return zero, or the

--      number of arguments passed to the program calling it.  Function

--      Argument is called with a parameter value one greater than the

--      actual number of arguments passed to the executing program, which

--      must result in Constraint_Error being raised.  Function Command_Name

--      should return the name of the executing program that called it

--      (specifically, this test name).  Function Set_Exit_Status is called

--      with two different parameter values, the constants Failure and

--      Success defined in package Ada.Command_Line.

--

--      The setting of the variable TC_Verbose allows for some additional

--      output to be displayed during the running of the test as an aid in

--      tracing the processing flow of the test.

--

-- APPLICABILITY CRITERIA:

--      This test is applicable to implementations that support the

--      declaration of package Command_Line as defined in the Ada Reference

--      manual.

--      An alternative declaration is allowed for package Command_Line if

--      different functionality is appropriate for the external execution

--      environment.

--

--

-- CHANGE HISTORY:

--      10 Jul 95   SAIC    Initial prerelease version.

--      02 May 96   SAIC    Incorporated reviewer comments for ACVC 2.1.

--      05 AUG 98   EDS     Allow Null string result to be returned from

--                          Function Command

--!

with Ada.Command_Line;

with Ada.Exceptions;

with Report;

procedure CXAF001 is

begin

   Report.Test ("CXAF001", "Check that an implementation supports the " &

                           "functionality defined in Package "          &

                           "Ada.Command_Line");

   Test_Block:

   declare

      use Ada.Exceptions;

      type String_Access is access all String;

      TC_Verbose           : Boolean := False;

      Number_Of_Arguments  : Natural := Natural'Last;

      Name_Of_Command      : String_Access;

   begin

      -- Check the result of function Argument_Count.

      -- Note: If the external environment does not support passing arguments

      --       to the program invoking the function, the function result

      --       will be zero.

      Number_Of_Arguments := Ada.Command_Line.Argument_Count;

      if Number_Of_Arguments = Natural'Last then

         Report.Failed("Argument_Count did not provide a return result");

      end if;

      if TC_Verbose then

         Report.Comment

           ("Argument_Count = " & Integer'Image(Number_Of_Arguments));

      end if;

      -- Check that the result of Function Argument is Constraint_Error

      -- when the Number argument is outside the range of 1..Argument_Count.

      Test_Function_Argument_1 :

      begin

         declare

            -- Define a value that will be outside the range of

            -- 1..Argument_Count.

            -- Note: If the external execution environment does not support

            --       passing arguments to a program, then Argument(N) for

            --       any N will raise Constraint_Error, since

            --       Argument_Count = 0;

            Arguments_Plus_One : Positive :=

              Ada.Command_Line.Argument_Count + 1;

            -- Using the above value in a call to Argument must result in

            -- the raising of Constraint_Error.

            Argument_String    : constant String :=

              Ada.Command_Line.Argument(Arguments_Plus_One);

         begin

            Report.Failed("Constraint_Error not raised by Function "  &

                          "Argument when provided a Number argument " &

                          "out of range");

         end;

      exception

         when Constraint_Error => null;  -- OK, expected exception.

            if TC_Verbose then

              Report.Comment ("Argument_Count raised Constraint_Error");

            end if;

         when others =>

            Report.Failed ("Unexpected exception raised by Argument " &

                           "in Test_Function_Argument_1 block");

      end Test_Function_Argument_1;

      -- Check that Function Argument returns a string result.

      Test_Function_Argument_2 :

      begin

         if Ada.Command_Line.Argument_Count > 0 then

            Report.Comment

              ("Last argument is: " &

               Ada.Command_Line.Argument(Ada.Command_Line.Argument_Count));

         elsif TC_Verbose then

            Report.Comment("Argument_Count is zero, no test of Function " &

                           "Argument for string result");

         end if;

      exception

         when others =>

            Report.Failed ("Unexpected exception raised by Argument " &

                           "in Test_Function_Argument_2 block");

      end Test_Function_Argument_2;

      -- Check the result of Function Command_Name.

      Name_Of_Command := new String'(Ada.Command_Line.Command_Name);

      if Name_Of_Command = null  then

         Report.Failed("Null string pointer returned from Function Command");

      elsif Name_Of_Command.all = "" then

         Report.Comment("Null string result returned from Function Command");

      elsif TC_Verbose then

         Report.Comment("Invoking command is " & Name_Of_Command.all);

      end if;

      -- Check that procedure Set_Exit_Status is available.

      -- Note: If the external execution environment does not support

      --       returning an exit value from a program, then Set_Exit_Status

      --       does nothing.

      Ada.Command_Line.Set_Exit_Status(Ada.Command_Line.Failure);

      if TC_Verbose then

         Report.Comment("Exit status set to Failure");

      end if;

      Ada.Command_Line.Set_Exit_Status(Ada.Command_Line.Success);

      if TC_Verbose then

         Report.Comment("Exit status set to Success");

      end if;

   exception

      when The_Error : others =>

         Report.Failed ("The following exception was raised in the " &

                        "Test_Block: " & Exception_Name(The_Error));

   end Test_Block;

   Report.Result;

end CXAF001;