annotate gcc/ada/libgnat/s-vallld.ads @ 131:84e7813d76e9

gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children 1830386684a0
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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . V A L _ L L D --
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6 -- --
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7 -- S p e c --
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8 -- --
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84e7813d76e9 gcc-8.2
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package contains routines for scanning decimal values where the size
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33 -- of the type is greater than Standard.Integer'Size, for use in Text_IO.
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34 -- Decimal_IO, and the Value attribute for such decimal types.
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35
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36 package System.Val_LLD is
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37 pragma Pure;
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38
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39 function Scan_Long_Long_Decimal
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40 (Str : String;
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41 Ptr : not null access Integer;
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42 Max : Integer;
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43 Scale : Integer) return Long_Long_Integer;
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44 -- This function scans the string starting at Str (Ptr.all) for a valid
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45 -- real literal according to the syntax described in (RM 3.5(43)). The
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46 -- substring scanned extends no further than Str (Max). There are three
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47 -- cases for the return:
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48 --
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49 -- If a valid real literal is found after scanning past any initial spaces,
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50 -- then Ptr.all is updated past the last character of the literal (but
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51 -- trailing spaces are not scanned out). The value returned is the value
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52 -- Long_Long_Integer'Integer_Value (decimal-literal-value), using the given
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53 -- Scale to determine this value.
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54 --
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55 -- If no valid real literal is found, then Ptr.all points either to an
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56 -- initial non-digit character, or to Max + 1 if the field is all spaces
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57 -- and the exception Constraint_Error is raised.
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58 --
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59 -- If a syntactically valid integer is scanned, but the value is out of
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60 -- range, or, in the based case, the base value is out of range or there
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61 -- is an out of range digit, then Ptr.all points past the integer, and
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62 -- Constraint_Error is raised.
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63 --
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64 -- Note: these rules correspond to the requirements for leaving the
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65 -- pointer positioned in Text_Io.Get
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66 --
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67 -- Note: if Str is null, i.e. if Max is less than Ptr, then this is a
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68 -- special case of an all-blank string, and Ptr is unchanged, and hence
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69 -- is greater than Max as required in this case.
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70
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71 function Value_Long_Long_Decimal
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72 (Str : String;
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73 Scale : Integer) return Long_Long_Integer;
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74 -- Used in computing X'Value (Str) where X is a decimal types whose size
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75 -- exceeds Standard.Integer'Size. Str is the string argument of the
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76 -- attribute. Constraint_Error is raised if the string is malformed
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77 -- or if the value is out of range, otherwise the value returned is the
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78 -- value Long_Long_Integer'Integer_Value (decimal-literal-value), using
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79 -- the given Scale to determine this value.
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80
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81 end System.Val_LLD;