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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT LIBRARY COMPONENTS --
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4 -- --
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5 -- ADA.STRINGS.LESS_CASE_INSENSITIVE --
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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) 2004-2018, 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 -- This unit was originally developed by Matthew J Heaney. --
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28 ------------------------------------------------------------------------------
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29
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30 with Ada.Characters.Handling; use Ada.Characters.Handling;
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31
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32 function Ada.Strings.Less_Case_Insensitive
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33 (Left, Right : String) return Boolean
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34 is
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35 LI : Integer := Left'First;
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36 RI : Integer := Right'First;
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37
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38 LC, RC : Character;
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39
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40 begin
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41 if LI > Left'Last then
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42 return RI <= Right'Last;
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43 end if;
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44
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45 if RI > Right'Last then
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46 return False;
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47 end if;
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48
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49 loop
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50 LC := To_Lower (Left (LI));
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51 RC := To_Lower (Right (RI));
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52
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53 if LC < RC then
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54 return True;
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55 end if;
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56
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57 if LC > RC then
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58 return False;
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59 end if;
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60
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61 if LI = Left'Last then
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62 return RI < Right'Last;
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63 end if;
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64
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65 if RI = Right'Last then
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66 return False;
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67 end if;
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68
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69 LI := LI + 1;
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70 RI := RI + 1;
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71 end loop;
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72 end Ada.Strings.Less_Case_Insensitive;
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