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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 _ D E C --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1992-2017, 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 with System.Val_Real; use System.Val_Real;
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33
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34 package body System.Val_Dec is
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35
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36 ------------------
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37 -- Scan_Decimal --
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38 ------------------
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39
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40 -- For decimal types where Size < Integer'Size, it is fine to use
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41 -- the floating-point circuit, since it certainly has sufficient
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42 -- precision for any reasonable hardware, and we just don't support
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43 -- things on junk hardware.
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44
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45 function Scan_Decimal
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46 (Str : String;
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47 Ptr : not null access Integer;
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48 Max : Integer;
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49 Scale : Integer) return Integer
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50 is
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51 Val : Long_Long_Float;
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52 begin
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53 Val := Scan_Real (Str, Ptr, Max);
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54 return Integer (Val * 10.0 ** Scale);
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55 end Scan_Decimal;
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56
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57 -------------------
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58 -- Value_Decimal --
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59 -------------------
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60
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61 -- Again, we use the real circuit for this purpose
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62
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63 function Value_Decimal (Str : String; Scale : Integer) return Integer is
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64 begin
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65 return Integer (Value_Real (Str) * 10.0 ** Scale);
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66 end Value_Decimal;
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67
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68 end System.Val_Dec;
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