diff options
Diffstat (limited to 'gcc-4.2.1/gcc/ada/i-cstrin.adb')
| -rw-r--r-- | gcc-4.2.1/gcc/ada/i-cstrin.adb | 344 |
1 files changed, 0 insertions, 344 deletions
diff --git a/gcc-4.2.1/gcc/ada/i-cstrin.adb b/gcc-4.2.1/gcc/ada/i-cstrin.adb deleted file mode 100644 index 226661f47..000000000 --- a/gcc-4.2.1/gcc/ada/i-cstrin.adb +++ /dev/null @@ -1,344 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT COMPILER COMPONENTS -- --- -- --- I N T E R F A C E S . C . S T R I N G S -- --- -- --- B o d y -- --- -- --- Copyright (C) 1992-2005, Free Software Foundation, Inc. -- --- -- --- GNAT is free software; you can redistribute it and/or modify it under -- --- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 2, or (at your option) any later ver- -- --- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- --- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- --- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- --- for more details. You should have received a copy of the GNU General -- --- Public License distributed with GNAT; see file COPYING. If not, write -- --- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- --- Boston, MA 02110-1301, USA. -- --- -- --- As a special exception, if other files instantiate generics from this -- --- unit, or you link this unit with other files to produce an executable, -- --- this unit does not by itself cause the resulting executable to be -- --- covered by the GNU General Public License. This exception does not -- --- however invalidate any other reasons why the executable file might be -- --- covered by the GNU Public License. -- --- -- --- GNAT was originally developed by the GNAT team at New York University. -- --- Extensive contributions were provided by Ada Core Technologies Inc. -- --- -- ------------------------------------------------------------------------------- - -with System; use System; -with System.Storage_Elements; use System.Storage_Elements; - -with Unchecked_Conversion; - -package body Interfaces.C.Strings is - - -- Note that the type chars_ptr has a pragma No_Strict_Aliasing in the - -- spec, to prevent any assumptions about aliasing for values of this type, - -- since arbitrary addresses can be converted, and it is quite likely that - -- this type will in fact be used for aliasing values of other types. - - function To_chars_ptr is - new Unchecked_Conversion (Address, chars_ptr); - - function To_Address is - new Unchecked_Conversion (chars_ptr, Address); - - ----------------------- - -- Local Subprograms -- - ----------------------- - - function Peek (From : chars_ptr) return char; - pragma Inline (Peek); - -- Given a chars_ptr value, obtain referenced character - - procedure Poke (Value : char; Into : chars_ptr); - pragma Inline (Poke); - -- Given a chars_ptr, modify referenced Character value - - function "+" (Left : chars_ptr; Right : size_t) return chars_ptr; - pragma Inline ("+"); - -- Address arithmetic on chars_ptr value - - function Position_Of_Nul (Into : char_array) return size_t; - -- Returns position of the first Nul in Into or Into'Last + 1 if none - - -- We can't use directly System.Memory because the categorization is not - -- compatible, so we directly import here the malloc and free routines. - - function Memory_Alloc (Size : size_t) return chars_ptr; - pragma Import (C, Memory_Alloc, "__gnat_malloc"); - - procedure Memory_Free (Address : chars_ptr); - pragma Import (C, Memory_Free, "__gnat_free"); - - --------- - -- "+" -- - --------- - - function "+" (Left : chars_ptr; Right : size_t) return chars_ptr is - begin - return To_chars_ptr (To_Address (Left) + Storage_Offset (Right)); - end "+"; - - ---------- - -- Free -- - ---------- - - procedure Free (Item : in out chars_ptr) is - begin - if Item = Null_Ptr then - return; - end if; - - Memory_Free (Item); - Item := Null_Ptr; - end Free; - - -------------------- - -- New_Char_Array -- - -------------------- - - function New_Char_Array (Chars : char_array) return chars_ptr is - Index : size_t; - Pointer : chars_ptr; - - begin - -- Get index of position of null. If Index > Chars'last, - -- nul is absent and must be added explicitly. - - Index := Position_Of_Nul (Into => Chars); - Pointer := Memory_Alloc ((Index - Chars'First + 1)); - - -- If nul is present, transfer string up to and including nul - - if Index <= Chars'Last then - Update (Item => Pointer, - Offset => 0, - Chars => Chars (Chars'First .. Index), - Check => False); - else - -- If original string has no nul, transfer whole string and add - -- terminator explicitly. - - Update (Item => Pointer, - Offset => 0, - Chars => Chars, - Check => False); - Poke (nul, into => Pointer + size_t'(Chars'Length)); - end if; - - return Pointer; - end New_Char_Array; - - ---------------- - -- New_String -- - ---------------- - - function New_String (Str : String) return chars_ptr is - begin - return New_Char_Array (To_C (Str)); - end New_String; - - ---------- - -- Peek -- - ---------- - - function Peek (From : chars_ptr) return char is - begin - return char (From.all); - end Peek; - - ---------- - -- Poke -- - ---------- - - procedure Poke (Value : char; Into : chars_ptr) is - begin - Into.all := Character (Value); - end Poke; - - --------------------- - -- Position_Of_Nul -- - --------------------- - - function Position_Of_Nul (Into : char_array) return size_t is - begin - for J in Into'Range loop - if Into (J) = nul then - return J; - end if; - end loop; - - return Into'Last + 1; - end Position_Of_Nul; - - ------------ - -- Strlen -- - ------------ - - function Strlen (Item : chars_ptr) return size_t is - Item_Index : size_t := 0; - - begin - if Item = Null_Ptr then - raise Dereference_Error; - end if; - - loop - if Peek (Item + Item_Index) = nul then - return Item_Index; - end if; - - Item_Index := Item_Index + 1; - end loop; - end Strlen; - - ------------------ - -- To_Chars_Ptr -- - ------------------ - - function To_Chars_Ptr - (Item : char_array_access; - Nul_Check : Boolean := False) return chars_ptr - is - begin - if Item = null then - return Null_Ptr; - elsif Nul_Check - and then Position_Of_Nul (Into => Item.all) > Item'Last - then - raise Terminator_Error; - else - return To_chars_ptr (Item (Item'First)'Address); - end if; - end To_Chars_Ptr; - - ------------ - -- Update -- - ------------ - - procedure Update - (Item : chars_ptr; - Offset : size_t; - Chars : char_array; - Check : Boolean := True) - is - Index : chars_ptr := Item + Offset; - - begin - if Check and then Offset + Chars'Length > Strlen (Item) then - raise Update_Error; - end if; - - for J in Chars'Range loop - Poke (Chars (J), Into => Index); - Index := Index + size_t'(1); - end loop; - end Update; - - procedure Update - (Item : chars_ptr; - Offset : size_t; - Str : String; - Check : Boolean := True) - is - begin - -- Note: in RM 95, the Append_Nul => False parameter is omitted. But - -- this has the unintended consequence of truncating the string after - -- an update. As discussed in Ada 2005 AI-242, this was unintended, - -- and should be corrected. Since this is a clear error, it seems - -- appropriate to apply the correction in Ada 95 mode as well. - - Update (Item, Offset, To_C (Str, Append_Nul => False), Check); - end Update; - - ----------- - -- Value -- - ----------- - - function Value (Item : chars_ptr) return char_array is - Result : char_array (0 .. Strlen (Item)); - - begin - if Item = Null_Ptr then - raise Dereference_Error; - end if; - - -- Note that the following loop will also copy the terminating Nul - - for J in Result'Range loop - Result (J) := Peek (Item + J); - end loop; - - return Result; - end Value; - - function Value - (Item : chars_ptr; - Length : size_t) return char_array - is - begin - if Item = Null_Ptr then - raise Dereference_Error; - end if; - - -- ACATS cxb3010 checks that Constraint_Error gets raised when Length - -- is 0. Seems better to check that Length is not null before declaring - -- an array with size_t bounds of 0 .. Length - 1 anyway. - - if Length = 0 then - raise Constraint_Error; - end if; - - declare - Result : char_array (0 .. Length - 1); - - begin - for J in Result'Range loop - Result (J) := Peek (Item + J); - - if Result (J) = nul then - return Result (0 .. J); - end if; - end loop; - - return Result; - end; - end Value; - - function Value (Item : chars_ptr) return String is - begin - return To_Ada (Value (Item)); - end Value; - - function Value (Item : chars_ptr; Length : size_t) return String is - Result : char_array (0 .. Length); - - begin - -- As per AI-00177, this is equivalent to: - - -- To_Ada (Value (Item, Length) & nul); - - if Item = Null_Ptr then - raise Dereference_Error; - end if; - - for J in 0 .. Length - 1 loop - Result (J) := Peek (Item + J); - - if Result (J) = nul then - return To_Ada (Result (0 .. J)); - end if; - end loop; - - Result (Length) := nul; - return To_Ada (Result); - end Value; - -end Interfaces.C.Strings; |