Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-vallld.ads @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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1 ------------------------------------------------------------------------------ | |
2 -- -- | |
3 -- GNAT COMPILER COMPONENTS -- | |
4 -- -- | |
5 -- S Y S T E M . V A L _ L L D -- | |
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 -- This package contains routines for scanning decimal values where the size | |
33 -- of the type is greater than Standard.Integer'Size, for use in Text_IO. | |
34 -- Decimal_IO, and the Value attribute for such decimal types. | |
35 | |
36 package System.Val_LLD is | |
37 pragma Pure; | |
38 | |
39 function Scan_Long_Long_Decimal | |
40 (Str : String; | |
41 Ptr : not null access Integer; | |
42 Max : Integer; | |
43 Scale : Integer) return Long_Long_Integer; | |
44 -- This function scans the string starting at Str (Ptr.all) for a valid | |
45 -- real literal according to the syntax described in (RM 3.5(43)). The | |
46 -- substring scanned extends no further than Str (Max). There are three | |
47 -- cases for the return: | |
48 -- | |
49 -- If a valid real literal is found after scanning past any initial spaces, | |
50 -- then Ptr.all is updated past the last character of the literal (but | |
51 -- trailing spaces are not scanned out). The value returned is the value | |
52 -- Long_Long_Integer'Integer_Value (decimal-literal-value), using the given | |
53 -- Scale to determine this value. | |
54 -- | |
55 -- If no valid real literal is found, then Ptr.all points either to an | |
56 -- initial non-digit character, or to Max + 1 if the field is all spaces | |
57 -- and the exception Constraint_Error is raised. | |
58 -- | |
59 -- If a syntactically valid integer is scanned, but the value is out of | |
60 -- range, or, in the based case, the base value is out of range or there | |
61 -- is an out of range digit, then Ptr.all points past the integer, and | |
62 -- Constraint_Error is raised. | |
63 -- | |
64 -- Note: these rules correspond to the requirements for leaving the | |
65 -- pointer positioned in Text_Io.Get | |
66 -- | |
67 -- Note: if Str is null, i.e. if Max is less than Ptr, then this is a | |
68 -- special case of an all-blank string, and Ptr is unchanged, and hence | |
69 -- is greater than Max as required in this case. | |
70 | |
71 function Value_Long_Long_Decimal | |
72 (Str : String; | |
73 Scale : Integer) return Long_Long_Integer; | |
74 -- Used in computing X'Value (Str) where X is a decimal types whose size | |
75 -- exceeds Standard.Integer'Size. Str is the string argument of the | |
76 -- attribute. Constraint_Error is raised if the string is malformed | |
77 -- or if the value is out of range, otherwise the value returned is the | |
78 -- value Long_Long_Integer'Integer_Value (decimal-literal-value), using | |
79 -- the given Scale to determine this value. | |
80 | |
81 end System.Val_LLD; |