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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) 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 --
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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 -- 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 is
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39
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40 ----------------
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41 -- Str_Concat --
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42 ----------------
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43
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44 function Str_Concat (X, Y : String) return String is
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45 begin
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46 if X'Length = 0 then
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47 return Y;
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48
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49 else
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50 declare
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51 L : constant Natural := X'Length + Y'Length;
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52 R : String (X'First .. X'First + L - 1);
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53
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54 begin
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55 R (X'Range) := X;
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56 R (X'First + X'Length .. R'Last) := Y;
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57 return R;
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58 end;
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59 end if;
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60 end Str_Concat;
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61
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62 -------------------
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63 -- Str_Concat_CC --
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64 -------------------
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65
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66 function Str_Concat_CC (X, Y : Character) return String is
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67 R : String (1 .. 2);
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68
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69 begin
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70 R (1) := X;
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71 R (2) := Y;
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72 return R;
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73 end Str_Concat_CC;
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74
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75 -------------------
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76 -- Str_Concat_CS --
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77 -------------------
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78
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79 function Str_Concat_CS (X : Character; Y : String) return String is
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80 R : String (1 .. Y'Length + 1);
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81
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82 begin
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83 R (1) := X;
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84 R (2 .. R'Last) := Y;
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85 return R;
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86 end Str_Concat_CS;
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87
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88 -------------------
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89 -- Str_Concat_SC --
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90 -------------------
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91
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92 function Str_Concat_SC (X : String; Y : Character) return String is
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93 begin
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94 if X'Length = 0 then
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95 return (1 => Y);
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96
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97 else
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98 declare
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99 R : String (X'First .. X'Last + 1);
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100
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101 begin
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102 R (X'Range) := X;
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103 R (R'Last) := Y;
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104 return R;
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105 end;
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106 end if;
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107 end Str_Concat_SC;
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108
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109 end System.String_Ops;
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