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Diffstat (limited to 'gcc-4.3.1/gcc/ada/s-valdec.ads')
| -rw-r--r-- | gcc-4.3.1/gcc/ada/s-valdec.ads | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/gcc-4.3.1/gcc/ada/s-valdec.ads b/gcc-4.3.1/gcc/ada/s-valdec.ads new file mode 100644 index 000000000..61d9c076c --- /dev/null +++ b/gcc-4.3.1/gcc/ada/s-valdec.ads @@ -0,0 +1,81 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . V A L _ D E C -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2006, 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 2, 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. See the GNU General Public License -- +-- for more details. You should have received a copy of the GNU General -- +-- Public License distributed with GNAT; see file COPYING. If not, write -- +-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- +-- Boston, MA 02110-1301, USA. -- +-- -- +-- As a special exception, if other files instantiate generics from this -- +-- unit, or you link this unit with other files to produce an executable, -- +-- this unit does not by itself cause the resulting executable to be -- +-- covered by the GNU General Public License. This exception does not -- +-- however invalidate any other reasons why the executable file might be -- +-- covered by the GNU Public License. -- +-- -- +-- 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 decimal values where the size +-- of the type is no greater than Standard.Integer'Size, for use in Text_IO. +-- Decimal_IO, and the Value attribute for such decimal types. + +package System.Val_Dec is + pragma Pure; + + function Scan_Decimal + (Str : String; + Ptr : not null access Integer; + Max : Integer; + Scale : Integer) return Integer; + -- This function scans the string starting at Str (Ptr.all) for a valid + -- real literal according to the syntax described in (RM 3.5(43)). The + -- substring scanned extends no further than Str (Max). There are three + -- cases for the return: + -- + -- If a valid real literal is found after scanning past any initial spaces, + -- then Ptr.all is updated past the last character of the literal (but + -- trailing spaces are not scanned out). The value returned is the value + -- Integer'Integer_Value (decimal-literal-value), using the given Scale + -- to determine this value. + -- + -- If no valid real literal 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: if Str is null, 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. + + function Value_Decimal (Str : String; Scale : Integer) return Integer; + -- Used in computing X'Value (Str) where X is a decimal types whose size + -- does not exceed Standard.Integer'Size. 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, otherwise the value returned is the + -- value Integer'Integer_Value (decimal-literal-value), using the given + -- Scale to determine this value. + +end System.Val_Dec; |