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Diffstat (limited to 'gcc/ada/libgnat/s-vallli.adb')
| -rw-r--r-- | gcc/ada/libgnat/s-vallli.adb | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/gcc/ada/libgnat/s-vallli.adb b/gcc/ada/libgnat/s-vallli.adb new file mode 100644 index 00000000000..0d1dfd5f93c --- /dev/null +++ b/gcc/ada/libgnat/s-vallli.adb @@ -0,0 +1,120 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . V A L _ L L I -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2017, 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 3, 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. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +with System.Unsigned_Types; use System.Unsigned_Types; +with System.Val_LLU; use System.Val_LLU; +with System.Val_Util; use System.Val_Util; + +package body System.Val_LLI is + + ---------------------------- + -- Scan_Long_Long_Integer -- + ---------------------------- + + function Scan_Long_Long_Integer + (Str : String; + Ptr : not null access Integer; + Max : Integer) return Long_Long_Integer + is + Uval : Long_Long_Unsigned; + -- Unsigned result + + Minus : Boolean := False; + -- Set to True if minus sign is present, otherwise to False + + Start : Positive; + -- Saves location of first non-blank + + begin + Scan_Sign (Str, Ptr, Max, Minus, Start); + + if Str (Ptr.all) not in '0' .. '9' then + Ptr.all := Start; + Bad_Value (Str); + end if; + + Uval := Scan_Raw_Long_Long_Unsigned (Str, Ptr, Max); + + -- Deal with overflow cases, and also with maximum negative number + + if Uval > Long_Long_Unsigned (Long_Long_Integer'Last) then + if Minus + and then Uval = Long_Long_Unsigned (-(Long_Long_Integer'First)) + then + return Long_Long_Integer'First; + else + Bad_Value (Str); + end if; + + -- Negative values + + elsif Minus then + return -(Long_Long_Integer (Uval)); + + -- Positive values + + else + return Long_Long_Integer (Uval); + end if; + end Scan_Long_Long_Integer; + + ----------------------------- + -- Value_Long_Long_Integer -- + ----------------------------- + + function Value_Long_Long_Integer (Str : String) return Long_Long_Integer is + begin + -- We have to special case Str'Last = Positive'Last because the normal + -- circuit ends up setting P to Str'Last + 1 which is out of bounds. We + -- deal with this by converting to a subtype which fixes the bounds. + + if Str'Last = Positive'Last then + declare + subtype NT is String (1 .. Str'Length); + begin + return Value_Long_Long_Integer (NT (Str)); + end; + + -- Normal case where Str'Last < Positive'Last + + else + declare + V : Long_Long_Integer; + P : aliased Integer := Str'First; + begin + V := Scan_Long_Long_Integer (Str, P'Access, Str'Last); + Scan_Trailing_Blanks (Str, P); + return V; + end; + end if; + end Value_Long_Long_Integer; + +end System.Val_LLI; |