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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- S Y S T E M . I M G _ D E C --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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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 -- Image for decimal fixed types where the size of the corresponding integer
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33 -- type does not exceed Integer'Size (also used for Text_IO.Decimal_IO output)
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34
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35 package System.Img_Dec is
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36 pragma Pure;
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37
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38 procedure Image_Decimal
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39 (V : Integer;
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40 S : in out String;
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41 P : out Natural;
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42 Scale : Integer);
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43 -- Computes fixed_type'Image (V), where V is the integer value (in units of
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44 -- delta) of a decimal type whose Scale is as given and stores the result
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45 -- S (1 .. P), updating P to the value of L. The image is given by the
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46 -- rules in RM 3.5(34) for fixed-point type image functions. The caller
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47 -- guarantees that S is long enough to hold the result. S need not have a
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48 -- lower bound of 1.
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49
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50 procedure Set_Image_Decimal
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51 (V : Integer;
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52 S : in out String;
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53 P : in out Natural;
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54 Scale : Integer;
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55 Fore : Natural;
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56 Aft : Natural;
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57 Exp : Natural);
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58 -- Sets the image of V, where V is the integer value (in units of delta)
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59 -- of a decimal type with the given Scale, starting at S (P + 1), updating
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60 -- P to point to the last character stored, the caller promises that the
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61 -- buffer is large enough and no check is made for this. Constraint_Error
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62 -- will not necessarily be raised if this requirement is violated, since
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63 -- it is perfectly valid to compile this unit with checks off. The Fore,
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64 -- Aft and Exp values can be set to any valid values for the case of use
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65 -- by Text_IO.Decimal_IO. Note that there is no leading space stored.
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66
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67 procedure Set_Decimal_Digits
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68 (Digs : in out String;
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69 NDigs : Natural;
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70 S : out String;
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71 P : in out Natural;
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72 Scale : Integer;
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73 Fore : Natural;
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74 Aft : Natural;
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75 Exp : Natural);
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76 -- This procedure has the same semantics as Set_Image_Decimal, except that
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77 -- the value in Digs (1 .. NDigs) is given as a string of decimal digits
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78 -- preceded by either a minus sign or a space (i.e. the integer image of
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79 -- the value in units of delta). The call may destroy the value in Digs,
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80 -- which is why Digs is in-out (this happens if rounding is required).
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81 -- Set_Decimal_Digits is shared by all the decimal image routines.
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82
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83 end System.Img_Dec;
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