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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 . S T R I N G _ O P S _ C O N C A T _ 4 --
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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) 1992-2018, 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 -- NOTE: This package is obsolescent. It is no longer used by the compiler
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33 -- which now generates concatenation inline. It is retained only because
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34 -- it may be used during bootstrapping using old versions of the compiler.
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35
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36 pragma Compiler_Unit_Warning;
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37
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38 package body System.String_Ops_Concat_4 is
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39
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40 ------------------
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41 -- Str_Concat_4 --
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42 ------------------
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43
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44 function Str_Concat_4 (S1, S2, S3, S4 : String) return String is
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45 begin
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46 if S1'Length = 0 then
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47 return S2 & S3 & S4;
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48
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49 else
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50 declare
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51 L12 : constant Natural := S1'Length + S2'Length;
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52 L13 : constant Natural := L12 + S3'Length;
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53 L14 : constant Natural := L13 + S4'Length;
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54 R : String (S1'First .. S1'First + L14 - 1);
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55
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56 begin
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57 R (S1'First .. S1'Last) := S1;
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58 R (S1'Last + 1 .. S1'First + L12 - 1) := S2;
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59 R (S1'First + L12 .. S1'First + L13 - 1) := S3;
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60 R (S1'First + L13 .. R'Last) := S4;
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61 return R;
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62 end;
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63 end if;
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64 end Str_Concat_4;
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65
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66 end System.String_Ops_Concat_4;
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