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Diffstat (limited to 'gcc/ada/libgnat/s-imgllb.adb')
| -rw-r--r-- | gcc/ada/libgnat/s-imgllb.adb | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/gcc/ada/libgnat/s-imgllb.adb b/gcc/ada/libgnat/s-imgllb.adb new file mode 100644 index 00000000000..769ad23eda5 --- /dev/null +++ b/gcc/ada/libgnat/s-imgllb.adb @@ -0,0 +1,161 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M . I M G _ L L B -- +-- -- +-- 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; + +package body System.Img_LLB is + + --------------------------------------- + -- Set_Image_Based_Long_Long_Integer -- + --------------------------------------- + + procedure Set_Image_Based_Long_Long_Integer + (V : Long_Long_Integer; + B : Natural; + W : Integer; + S : out String; + P : in out Natural) + is + Start : Natural; + + begin + -- Positive case can just use the unsigned circuit directly + + if V >= 0 then + Set_Image_Based_Long_Long_Unsigned + (Long_Long_Unsigned (V), B, W, S, P); + + -- Negative case has to set a minus sign. Note also that we have to be + -- careful not to generate overflow with the largest negative number. + + else + P := P + 1; + S (P) := ' '; + Start := P; + + declare + pragma Suppress (Overflow_Check); + pragma Suppress (Range_Check); + begin + Set_Image_Based_Long_Long_Unsigned + (Long_Long_Unsigned (-V), B, W - 1, S, P); + end; + + -- Set minus sign in last leading blank location. Because of the + -- code above, there must be at least one such location. + + while S (Start + 1) = ' ' loop + Start := Start + 1; + end loop; + + S (Start) := '-'; + end if; + + end Set_Image_Based_Long_Long_Integer; + + ---------------------------------------- + -- Set_Image_Based_Long_Long_Unsigned -- + ---------------------------------------- + + procedure Set_Image_Based_Long_Long_Unsigned + (V : Long_Long_Unsigned; + B : Natural; + W : Integer; + S : out String; + P : in out Natural) + is + Start : constant Natural := P; + F, T : Natural; + BU : constant Long_Long_Unsigned := Long_Long_Unsigned (B); + Hex : constant array + (Long_Long_Unsigned range 0 .. 15) of Character := + "0123456789ABCDEF"; + + procedure Set_Digits (T : Long_Long_Unsigned); + -- Set digits of absolute value of T + + ---------------- + -- Set_Digits -- + ---------------- + + procedure Set_Digits (T : Long_Long_Unsigned) is + begin + if T >= BU then + Set_Digits (T / BU); + P := P + 1; + S (P) := Hex (T mod BU); + else + P := P + 1; + S (P) := Hex (T); + end if; + end Set_Digits; + + -- Start of processing for Set_Image_Based_Long_Long_Unsigned + + begin + + if B >= 10 then + P := P + 1; + S (P) := '1'; + end if; + + P := P + 1; + S (P) := Character'Val (Character'Pos ('0') + B mod 10); + + P := P + 1; + S (P) := '#'; + + Set_Digits (V); + + P := P + 1; + S (P) := '#'; + + -- Add leading spaces if required by width parameter + + if P - Start < W then + F := P; + P := Start + W; + T := P; + + while F > Start loop + S (T) := S (F); + T := T - 1; + F := F - 1; + end loop; + + for J in Start + 1 .. T loop + S (J) := ' '; + end loop; + end if; + + end Set_Image_Based_Long_Long_Unsigned; + +end System.Img_LLB; |