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--- CXB3015.A
---
--- Grant of Unlimited Rights
---
--- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
--- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
--- unlimited rights in the software and documentation contained herein.
--- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
--- this public release, the Government intends to confer upon all
--- recipients unlimited rights equal to those held by the Government.
--- These rights include rights to use, duplicate, release or disclose the
--- released technical data and computer software in whole or in part, in
--- any manner and for any purpose whatsoever, and to have or permit others
--- to do so.
---
--- DISCLAIMER
---
--- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
--- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
--- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
--- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
--- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
--- PARTICULAR PURPOSE OF SAID MATERIAL.
---*
---
--- OBJECTIVE:
--- Check that the "+" and "-" functions with Pointer and ptrdiff_t
--- parameters that return Pointer values produce correct results,
--- based on the size of the array elements.
---
--- Check that the "-" function with two Pointer parameters that
--- returns a ptrdiff_t type parameter produces correct results,
--- based on the size of the array elements.
---
--- Check that each of the "+" and "-" functions above will
--- propagate Pointer_Error if a Pointer parameter is null.
---
--- Check that the Increment and Decrement procedures provide the
--- correct "pointer arithmetic" operations.
---
--- TEST DESCRIPTION:
--- This test checks that the functions "+" and "-", and the procedures
--- Increment and Decrement in the generic package Interfaces.C.Pointers
--- will allow the user to perform "pointer arithmetic" operations on
--- Pointer values.
--- Package Interfaces.C.Pointers is instantiated three times, for
--- short values, chars, and arrays of arrays. Pointers from each
--- instantiated package are then used to reference different elements
--- of array objects. Pointer arithmetic operations are performed on
--- these pointers, and the results of these operations are verified
--- against expected pointer positions along the referenced arrays.
--- The propagation of Pointer_Error is checked for when the function
--- Pointer parameter is null.
---
--- The following chart indicates the combinations of subprograms and
--- parameter types used in this test.
---
---
--- Short Char Array
--- --------------------------
--- "+" Pointer, ptrdiff_t | X | | X |
--- |--------------------------|
--- "+" ptrdiff_t, Pointer | X | | X |
--- |--------------------------|
--- "-" Pointer, ptrdiff_t | | X | X |
--- |--------------------------|
--- "-" Pointer, Pointer | | X | X |
--- |--------------------------|
--- Increment (Pointer) | X | | X |
--- |--------------------------|
--- Decrement (Pointer) | X | | X |
--- --------------------------
---
--- This test assumes that the following characters are all included
--- in the implementation defined type Interfaces.C.char:
--- ' ', and 'a'..'z'.
---
--- APPLICABILITY CRITERIA:
--- This test is applicable to all implementations that provide
--- package Interfaces.C.Pointers. If an implementation provides
--- package Interfaces.C.Pointers, this test must compile, execute, and
--- report "PASSED".
---
---
--- CHANGE HISTORY:
--- 26 Oct 95 SAIC Initial prerelease version.
--- 13 May 96 SAIC Incorporated reviewer comments for ACVC 2.1.
--- 26 Oct 96 SAIC Incorporated reviewer comments.
--- 06 Mar 00 RLB Repaired so that array of arrays component
--- type is statically constrained. (C does not have
--- an analog to an array of dynamically constrained
--- arrays.)
-
-with Report;
-with Ada.Exceptions;
-with Interfaces.C.Pointers; -- N/A => ERROR
-
-procedure CXB3015 is
-begin
-
- Report.Test ("CXB3015", "Check that +, -, Increment, and Decrement " &
- "subprograms in Package Interfaces.C.Pointers " &
- "produce correct results");
-
- Test_Block:
- declare
-
- use Ada.Exceptions;
- use type Interfaces.C.short;
- use type Interfaces.C.size_t, Interfaces.C.ptrdiff_t;
- use type Interfaces.C.char, Interfaces.C.char_array;
-
- TC_Count : Interfaces.C.size_t;
- TC_Increment : Interfaces.C.ptrdiff_t;
- TC_ptrdiff_t : Interfaces.C.ptrdiff_t;
- TC_Short : Interfaces.C.short := 0;
- TC_Verbose : Boolean := False;
- Constant_Min_Array_Size : constant Interfaces.C.size_t := 0;
- Constant_Max_Array_Size : constant Interfaces.C.size_t := 20;
- Min_Array_Size : Interfaces.C.size_t := Interfaces.C.size_t(
- Report.Ident_Int(Integer(Constant_Min_Array_Size)));
- Max_Array_Size : Interfaces.C.size_t := Interfaces.C.size_t(
- Report.Ident_Int(Integer(Constant_Max_Array_Size)));
- Min_size_t,
- Max_size_t : Interfaces.C.size_t;
- Short_Terminator : Interfaces.C.short := Interfaces.C.short'Last;
- Alphabet : constant String := "abcdefghijklmnopqrstuvwxyz";
-
-
- type Short_Array_Type is
- array (Interfaces.C.size_t range <>) of aliased Interfaces.C.short;
-
- type Constrained_Array_Type is
- array (Min_Array_Size..Max_Array_Size) of aliased Interfaces.C.short;
-
- type Static_Constrained_Array_Type is
- array (Constant_Min_Array_Size .. Constant_Max_Array_Size) of
- aliased Interfaces.C.short;
-
- type Array_of_Arrays_Type is
- array (Interfaces.C.size_t range <>) of aliased
- Static_Constrained_Array_Type;
-
-
- Short_Array : Short_Array_Type(Min_Array_Size..Max_Array_Size);
-
- Constrained_Array : Constrained_Array_Type;
-
- Terminator_Array : Static_Constrained_Array_Type :=
- (others => Short_Terminator);
-
- Ch_Array : Interfaces.C.char_array
- (0..Interfaces.C.size_t(Alphabet'Length)) :=
- Interfaces.C.To_C(Alphabet, True);
-
- Array_of_Arrays : Array_of_Arrays_Type
- (Min_Array_Size..Max_Array_Size);
-
-
- package Short_Pointers is new
- Interfaces.C.Pointers (Index => Interfaces.C.size_t,
- Element => Interfaces.C.short,
- Element_Array => Short_Array_Type,
- Default_Terminator => Short_Terminator);
-
- package Char_Pointers is new
- Interfaces.C.Pointers (Interfaces.C.size_t,
- Interfaces.C.char,
- Element_Array => Interfaces.C.char_array,
- Default_Terminator => Interfaces.C.nul);
-
- package Array_Pointers is new
- Interfaces.C.Pointers (Interfaces.C.size_t,
- Static_Constrained_Array_Type,
- Array_of_Arrays_Type,
- Terminator_Array);
-
-
- use Short_Pointers, Char_Pointers, Array_Pointers;
-
- Short_Ptr : Short_Pointers.Pointer := Short_Array(0)'Access;
- Char_Ptr : Char_Pointers.Pointer := Ch_Array(0)'Access;
- Start_Char_Ptr : Char_Pointers.Pointer := Ch_Array(1)'Access;
- End_Char_Ptr : Char_Pointers.Pointer := Ch_Array(10)'Access;
- Array_Ptr : Array_Pointers.Pointer := Array_of_Arrays(0)'Access;
- Start_Array_Ptr : Array_Pointers.Pointer := Array_of_Arrays(1)'Access;
- End_Array_Ptr : Array_Pointers.Pointer := Array_of_Arrays(10)'Access;
-
- begin
-
- -- Provide initial values for the arrays that hold short int values.
-
- for i in Min_Array_Size..Max_Array_Size-1 loop
- Short_Array(i) := Interfaces.C.short(i);
- for j in Min_Array_Size..Max_Array_Size loop
- -- Initialize this "array of arrays" so that element (i)(0)
- -- is different for each value of i.
- Array_of_Arrays(i)(j) := TC_Short;
- TC_Short := TC_Short + 1;
- end loop;
- end loop;
-
- -- Set the final element of each array object to be the "terminator"
- -- element used in the instantiations above.
-
- Short_Array(Max_Array_Size) := Short_Terminator;
- Array_of_Arrays(Max_Array_Size) := Terminator_Array;
-
- -- Check starting pointer positions.
-
- if Short_Ptr.all /= 0 or
- Char_Ptr.all /= Ch_Array(0) or
- Array_Ptr.all /= Array_of_Arrays(0)
- then
- Report.Failed("Incorrect initial value for the first " &
- "Short_Array, Ch_Array, or Array_of_Array values");
- end if;
-
-
- -- Check that both versions of the "+" function with Pointer and
- -- ptrdiff_t parameters, that return a Pointer value, produce correct
- -- results, based on the size of the array elements.
-
- for i in Min_Array_Size + 1 .. Max_Array_Size loop
-
- if Integer(i)/2*2 /= Integer(i) then -- Odd numbered loops.
- -- Pointer + ptrdiff_t, increment by 1.
- Short_Ptr := Short_Ptr + 1;
- else -- Even numbered loops.
- -- ptrdiff_t + Pointer, increment by 1.
- Short_Ptr := 1 + Short_Ptr;
- end if;
-
- if Short_Ptr.all /= Short_Array(i) then
- Report.Failed("Incorrect value returned following use " &
- "of the function +, incrementing by 1, " &
- "array position : " & Integer'Image(Integer(i)));
- if not TC_Verbose then
- exit;
- end if;
- end if;
- end loop;
-
- Array_Ptr := Array_of_Arrays(Min_Array_Size)'Access;
- TC_Count := Min_Array_Size;
- TC_Increment := 3;
- while TC_Count+Interfaces.C.size_t(TC_Increment) < Max_Array_Size loop
-
- if Integer(TC_Count)/2*2 /= Integer(TC_Count) then
- -- Odd numbered loops.
- -- Pointer + ptrdiff_t, increment by 3.
- Array_Ptr := Array_Pointers."+"(Array_Ptr, TC_Increment);
- else
- -- Odd numbered loops.
- -- ptrdiff_t + Pointer, increment by 3.
- Array_Ptr := Array_Pointers."+"(Left => TC_Increment,
- Right => Array_Ptr);
- end if;
-
- if Array_Ptr.all /=
- Array_of_Arrays(TC_Count+Interfaces.C.size_t(TC_Increment))
- then
- Report.Failed("Incorrect value returned following use " &
- "of the function +, incrementing by " &
- Integer'Image(Integer(TC_Increment)) &
- ", array position : " &
- Integer'Image(Integer(TC_Count) +
- Integer(TC_Increment)));
- if not TC_Verbose then
- exit;
- end if;
- end if;
-
- TC_Count := TC_Count + Interfaces.C.size_t(TC_Increment);
- end loop;
-
-
-
- -- Check that the "-" function with Pointer and ptrdiff_t parameters,
- -- that returns a Pointer result, produces correct results, based
- -- on the size of the array elements.
-
- -- Set the pointer to the last element in the char_array, which is a
- -- nul char.
- Char_Ptr := Ch_Array(Interfaces.C.size_t(Alphabet'Length))'Access;
-
- if Char_Ptr.all /= Interfaces.C.nul then
- Report.Failed("Incorrect initial value for the last " &
- "Ch_Array value");
- end if;
-
- Min_size_t := 1;
- Max_size_t := Interfaces.C.size_t(Alphabet'Length);
-
- for i in reverse Min_size_t..Max_size_t loop
-
- -- Subtract 1 from the pointer; it should now point to the previous
- -- element in the array.
- Char_Ptr := Char_Ptr - 1;
-
- if Char_Ptr.all /= Ch_Array(i-1) then
- Report.Failed("Incorrect value returned following use " &
- "of the function '-' with char element values, " &
- "array position : " & Integer'Image(Integer(i-1)));
- if not TC_Verbose then
- exit;
- end if;
- end if;
- end loop;
-
- Array_Ptr := Array_of_Arrays(Max_Array_Size)'Access;
- TC_Count := Max_Array_Size;
- TC_Increment := 3;
- while TC_Count > Min_Array_Size+Interfaces.C.size_t(TC_Increment) loop
-
- -- Decrement the pointer by 3.
- Array_Ptr := Array_Pointers."-"(Array_Ptr, Right => 3);
-
- if Array_Ptr.all /=
- Array_of_Arrays(TC_Count - Interfaces.C.size_t(TC_Increment))
- then
- Report.Failed("Incorrect value returned following use " &
- "of the function -, decrementing by " &
- Integer'Image(Integer(TC_Increment)) &
- ", array position : " &
- Integer'Image(Integer(TC_Count-3)));
- if not TC_Verbose then
- exit;
- end if;
- end if;
-
- TC_Count := TC_Count - Interfaces.C.size_t(TC_Increment);
- end loop;
-
-
-
- -- Check that the "-" function with two Pointer parameters, that
- -- returns a ptrdiff_t type result, produces correct results,
- -- based on the size of the array elements.
-
- TC_ptrdiff_t := 9;
- if Char_Pointers."-"(Left => End_Char_Ptr,
- Right => Start_Char_Ptr) /= TC_ptrdiff_t
- then
- Report.Failed("Incorrect result from pointer-pointer " &
- "subtraction - 1");
- end if;
-
- Start_Char_Ptr := Ch_Array(1)'Access;
- End_Char_Ptr := Ch_Array(25)'Access;
-
- TC_ptrdiff_t := 24;
- if Char_Pointers."-"(End_Char_Ptr,
- Right => Start_Char_Ptr) /= TC_ptrdiff_t
- then
- Report.Failed("Incorrect result from pointer-pointer " &
- "subtraction - 2");
- end if;
-
- TC_ptrdiff_t := 9;
- if Array_Pointers."-"(End_Array_Ptr,
- Start_Array_Ptr) /= TC_ptrdiff_t
- then
- Report.Failed("Incorrect result from pointer-pointer " &
- "subtraction - 3");
- end if;
-
- Start_Array_Ptr := Array_of_Arrays(Min_Array_Size)'Access;
- End_Array_Ptr := Array_of_Arrays(Max_Array_Size)'Access;
-
- TC_ptrdiff_t := Interfaces.C.ptrdiff_t(Max_Array_Size) -
- Interfaces.C.ptrdiff_t(Min_Array_Size);
- if End_Array_Ptr - Start_Array_Ptr /= TC_ptrdiff_t then
- Report.Failed("Incorrect result from pointer-pointer " &
- "subtraction - 4");
- end if;
-
-
-
- -- Check that the Increment procedure produces correct results,
- -- based upon the size of the array elements.
-
- Short_Ptr := Short_Array(0)'Access;
-
- for i in Min_Array_Size + 1 .. Max_Array_Size loop
- -- Increment the value of the Pointer; it should now point
- -- to the next element in the array.
- Increment(Ref => Short_Ptr);
-
- if Short_Ptr.all /= Short_Array(i) then
- Report.Failed("Incorrect value returned following use " &
- "of the Procedure Increment on pointer to an " &
- "array of short values, array position : " &
- Integer'Image(Integer(i)));
- if not TC_Verbose then
- exit;
- end if;
- end if;
- end loop;
-
- Array_Ptr := Array_of_Arrays(0)'Access;
-
- for i in Min_Array_Size + 1 .. Max_Array_Size loop
- -- Increment the value of the Pointer; it should now point
- -- to the next element in the array.
- Increment(Array_Ptr);
-
- if Array_Ptr.all /= Array_of_Arrays(i) then
- Report.Failed("Incorrect value returned following use " &
- "of the Procedure Increment on an array of " &
- "arrays, array position : " &
- Integer'Image(Integer(i)));
- if not TC_Verbose then
- exit;
- end if;
- end if;
- end loop;
-
-
- -- Check that the Decrement procedure produces correct results,
- -- based upon the size of the array elements.
-
- Short_Ptr := Short_Array(Max_Array_Size)'Access;
-
- for i in reverse Min_Array_Size .. Max_Array_Size - 1 loop
- -- Decrement the value of the Pointer; it should now point
- -- to the previous element in the array.
- Decrement(Ref => Short_Ptr);
-
- if Short_Ptr.all /= Short_Array(i) then
- Report.Failed("Incorrect value returned following use " &
- "of the Procedure Decrement on pointer to an " &
- "array of short values, array position : " &
- Integer'Image(Integer(i)));
- if not TC_Verbose then
- exit;
- end if;
- end if;
- end loop;
-
- Array_Ptr := Array_of_Arrays(Max_Array_Size)'Access;
-
- for i in reverse Min_Array_Size .. Max_Array_Size - 1 loop
- -- Decrement the value of the Pointer; it should now point
- -- to the previous array element.
- Decrement(Array_Ptr);
-
- if Array_Ptr.all /= Array_of_Arrays(i) then
- Report.Failed("Incorrect value returned following use " &
- "of the Procedure Decrement on an array of " &
- "arrays, array position : " &
- Integer'Image(Integer(i)));
- if not TC_Verbose then
- exit;
- end if;
- end if;
- end loop;
-
-
-
- -- Check that each of the "+" and "-" functions above will
- -- propagate Pointer_Error if a Pointer parameter is null.
-
- begin
- Short_Ptr := null;
- Short_Ptr := Short_Ptr + 4;
- Report.Failed("Pointer_Error not raised by Function + when " &
- "the Pointer parameter is null");
- if Short_Ptr /= null then -- To avoid optimization.
- Report.Comment("This should never be printed");
- end if;
- exception
- when Short_Pointers.Pointer_Error => null; -- OK, expected exception.
- when others =>
- Report.Failed("Unexpected exception raised by Function + " &
- "when the Pointer parameter is null");
- end;
-
-
- begin
- Char_Ptr := null;
- Char_Ptr := Char_Ptr - 1;
- Report.Failed("Pointer_Error not raised by Function - when " &
- "the Pointer parameter is null");
- if Char_Ptr /= null then -- To avoid optimization.
- Report.Comment("This should never be printed");
- end if;
- exception
- when Char_Pointers.Pointer_Error => null; -- OK, expected exception.
- when others =>
- Report.Failed("Unexpected exception raised by Function - " &
- "when the Pointer parameter is null");
- end;
-
-
- begin
- Array_Ptr := null;
- Decrement(Array_Ptr);
- Report.Failed("Pointer_Error not raised by Procedure Decrement " &
- "when the Pointer parameter is null");
- if Array_Ptr /= null then -- To avoid optimization.
- Report.Comment("This should never be printed");
- end if;
- exception
- when Array_Pointers.Pointer_Error => null; -- OK, expected exception.
- when others =>
- Report.Failed("Unexpected exception raised by Procedure " &
- "Decrement when the Pointer parameter is null");
- end;
-
-
- 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 CXB3015;