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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 . W I D _ W C H A R --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, 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 package body System.Wid_WChar is
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33
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34 --------------------------
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35 -- Width_Wide_Character --
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36 --------------------------
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37
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38 function Width_Wide_Character
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39 (Lo, Hi : Wide_Character) return Natural
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40 is
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41 W : Natural;
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42 P : Natural;
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43
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44 begin
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45 W := 0;
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46 for C in Lo .. Hi loop
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47 P := Wide_Character'Pos (C);
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48
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49 -- Here if we find a character in wide character range
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50 -- Width is max value (12) for Hex_hhhhhhhh
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51
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52 if P > 16#FF# then
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53 return 12;
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54
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55 -- If we are in character range then use length of character image
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56
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57 else
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58 declare
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59 S : constant String := Character'Image (Character'Val (P));
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60 begin
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61 W := Natural'Max (W, S'Length);
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62 end;
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63 end if;
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64 end loop;
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65
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66 return W;
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67 end Width_Wide_Character;
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68
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69 -------------------------------
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70 -- Width_Wide_Wide_Character --
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71 -------------------------------
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72
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73 function Width_Wide_Wide_Character
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74 (Lo, Hi : Wide_Wide_Character) return Natural
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75 is
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76 W : Natural;
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77 P : Natural;
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78
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79 begin
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80 W := 0;
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81 for C in Lo .. Hi loop
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82 P := Wide_Wide_Character'Pos (C);
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83
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84 -- Here if we find a character in wide wide character range.
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85 -- Width is max value (12) for Hex_hhhhhhhh
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86
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87 if P > 16#FF# then
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88 W := 12;
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89
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90 -- If we are in character range then use length of character image
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91
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92 else
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93 declare
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94 S : constant String := Character'Image (Character'Val (P));
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95 begin
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96 W := Natural'Max (W, S'Length);
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97 end;
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98 end if;
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99 end loop;
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100
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101 return W;
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102 end Width_Wide_Wide_Character;
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103
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104 end System.Wid_WChar;
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