Mercurial > hg > CbC > CbC_gcc
diff gcc/ada/libgnat/s-valllu.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/ada/libgnat/s-valllu.ads Fri Oct 27 22:46:09 2017 +0900 @@ -0,0 +1,129 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . V A L _ L L U -- +-- -- +-- S p e c -- +-- -- +-- 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. -- +-- -- +------------------------------------------------------------------------------ + +-- This package contains routines for scanning modular Long_Long_Unsigned +-- values for use in Text_IO.Modular_IO, and the Value attribute. + +with System.Unsigned_Types; + +package System.Val_LLU is + pragma Pure; + + function Scan_Raw_Long_Long_Unsigned + (Str : String; + Ptr : not null access Integer; + Max : Integer) return System.Unsigned_Types.Long_Long_Unsigned; + -- This function scans the string starting at Str (Ptr.all) for a valid + -- integer according to the syntax described in (RM 3.5(43)). The substring + -- scanned extends no further than Str (Max). Note: this does not scan + -- leading or trailing blanks, nor leading sign. + -- + -- There are three cases for the return: + -- + -- If a valid integer is found, then Ptr.all is updated past the last + -- character of the integer. + -- + -- If no valid integer is found, then Ptr.all points either to an initial + -- non-digit character, or to Max + 1 if the field is all spaces and the + -- exception Constraint_Error is raised. + -- + -- If a syntactically valid integer is scanned, but the value is out of + -- range, or, in the based case, the base value is out of range or there + -- is an out of range digit, then Ptr.all points past the integer, and + -- Constraint_Error is raised. + -- + -- Note: these rules correspond to the requirements for leaving the pointer + -- positioned in Text_IO.Get. Note that the rules as stated in the RM would + -- seem to imply that for a case like: + -- + -- 8#12345670009# + -- + -- the pointer should be left at the first # having scanned out the longest + -- valid integer literal (8), but in fact in this case the pointer points + -- past the final # and Constraint_Error is raised. This is the behavior + -- expected for Text_IO and enforced by the ACATS tests. + -- + -- If a based literal is malformed in that a character other than a valid + -- hexadecimal digit is encountered during scanning out the digits after + -- the # (this includes the case of using the wrong terminator, : instead + -- of # or vice versa) there are two cases. If all the digits before the + -- non-digit are in range of the base, as in + -- + -- 8#100x00# + -- 8#100: + -- + -- then in this case, the "base" value before the initial # is returned as + -- the result, and the pointer points to the initial # character on return. + -- + -- If an out of range digit has been detected before the invalid character, + -- as in: + -- + -- 8#900x00# + -- 8#900: + -- + -- then the pointer is also left at the initial # character, but constraint + -- error is raised reflecting the encounter of an out of range digit. + -- + -- Finally if we have an unterminated fixed-point constant where the final + -- # or : character is missing, Constraint_Error is raised and the pointer + -- is left pointing past the last digit, as in: + -- + -- 8#22 + -- + -- This string results in a Constraint_Error with the pointer pointing + -- past the second 2. + -- + -- Note: if Str is empty, i.e. if Max is less than Ptr, then this is a + -- special case of an all-blank string, and Ptr is unchanged, and hence + -- is greater than Max as required in this case. + -- + -- Note: this routine should not be called with Str'Last = Positive'Last. + -- If this occurs Program_Error is raised with a message noting that this + -- case is not supported. Most such cases are eliminated by the caller. + + function Scan_Long_Long_Unsigned + (Str : String; + Ptr : not null access Integer; + Max : Integer) return System.Unsigned_Types.Long_Long_Unsigned; + -- Same as Scan_Raw_Long_Long_Unsigned, except scans optional leading + -- blanks, and an optional leading plus sign. + -- + -- Note: if a minus sign is present, Constraint_Error will be raised. + -- Note: trailing blanks are not scanned. + + function Value_Long_Long_Unsigned + (Str : String) return System.Unsigned_Types.Long_Long_Unsigned; + -- Used in computing X'Value (Str) where X is a modular integer type whose + -- modulus exceeds the range of System.Unsigned_Types.Unsigned. Str is the + -- string argument of the attribute. Constraint_Error is raised if the + -- string is malformed, or if the value is out of range. + +end System.Val_LLU;