Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-valrea.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
comparison
equal
deleted
inserted
replaced
| 68:561a7518be6b | 111:04ced10e8804 |
|---|---|
| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT COMPILER COMPONENTS -- | |
| 4 -- -- | |
| 5 -- S Y S T E M . V A L _ R E A L -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. -- | |
| 10 -- -- | |
| 11 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 17 -- -- | |
| 18 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 -- version 3.1, as published by the Free Software Foundation. -- | |
| 21 -- -- | |
| 22 -- You should have received a copy of the GNU General Public License and -- | |
| 23 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 25 -- <http://www.gnu.org/licenses/>. -- | |
| 26 -- -- | |
| 27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 29 -- -- | |
| 30 ------------------------------------------------------------------------------ | |
| 31 | |
| 32 package System.Val_Real is | |
| 33 pragma Pure; | |
| 34 | |
| 35 function Scan_Real | |
| 36 (Str : String; | |
| 37 Ptr : not null access Integer; | |
| 38 Max : Integer) return Long_Long_Float; | |
| 39 -- This function scans the string starting at Str (Ptr.all) for a valid | |
| 40 -- real literal according to the syntax described in (RM 3.5(43)). The | |
| 41 -- substring scanned extends no further than Str (Max). There are three | |
| 42 -- cases for the return: | |
| 43 -- | |
| 44 -- If a valid real is found after scanning past any initial spaces, then | |
| 45 -- Ptr.all is updated past the last character of the real (but trailing | |
| 46 -- spaces are not scanned out). | |
| 47 -- | |
| 48 -- If no valid real is found, then Ptr.all points either to an initial | |
| 49 -- non-blank character, or to Max + 1 if the field is all spaces and the | |
| 50 -- exception Constraint_Error is raised. | |
| 51 -- | |
| 52 -- If a syntactically valid real is scanned, but the value is out of | |
| 53 -- range, or, in the based case, the base value is out of range or there | |
| 54 -- is an out of range digit, then Ptr.all points past the real literal, | |
| 55 -- and Constraint_Error is raised. | |
| 56 -- | |
| 57 -- Note: these rules correspond to the requirements for leaving the | |
| 58 -- pointer positioned in Text_Io.Get | |
| 59 -- | |
| 60 -- Note: if Str is null, i.e. if Max is less than Ptr, then this is a | |
| 61 -- special case of an all-blank string, and Ptr is unchanged, and hence | |
| 62 -- is greater than Max as required in this case. | |
| 63 -- | |
| 64 -- Note: this routine should not be called with Str'Last = Positive'Last. | |
| 65 -- If this occurs Program_Error is raised with a message noting that this | |
| 66 -- case is not supported. Most such cases are eliminated by the caller. | |
| 67 | |
| 68 function Value_Real (Str : String) return Long_Long_Float; | |
| 69 -- Used in computing X'Value (Str) where X is a floating-point type or an | |
| 70 -- ordinary fixed-point type. Str is the string argument of the attribute. | |
| 71 -- Constraint_Error is raised if the string is malformed, or if the value | |
| 72 -- out of range of Long_Long_Float. | |
| 73 | |
| 74 end System.Val_Real; |