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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . V A L _ I N T --
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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 with System.Unsigned_Types; use System.Unsigned_Types;
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33 with System.Val_Uns; use System.Val_Uns;
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34 with System.Val_Util; use System.Val_Util;
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35
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36 package body System.Val_Int is
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37
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38 ------------------
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39 -- Scan_Integer --
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40 ------------------
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41
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42 function Scan_Integer
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43 (Str : String;
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44 Ptr : not null access Integer;
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45 Max : Integer) return Integer
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46 is
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47 Uval : Unsigned;
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48 -- Unsigned result
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49
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50 Minus : Boolean := False;
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51 -- Set to True if minus sign is present, otherwise to False
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52
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53 Start : Positive;
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54 -- Saves location of first non-blank (not used in this case)
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55
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56 begin
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57 Scan_Sign (Str, Ptr, Max, Minus, Start);
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58
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59 if Str (Ptr.all) not in '0' .. '9' then
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60 Ptr.all := Start;
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61 Bad_Value (Str);
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62 end if;
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63
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64 Uval := Scan_Raw_Unsigned (Str, Ptr, Max);
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65
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66 -- Deal with overflow cases, and also with maximum negative number
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67
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68 if Uval > Unsigned (Integer'Last) then
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69 if Minus and then Uval = Unsigned (-(Integer'First)) then
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70 return Integer'First;
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71 else
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72 Bad_Value (Str);
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73 end if;
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74
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75 -- Negative values
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76
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77 elsif Minus then
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78 return -(Integer (Uval));
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79
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80 -- Positive values
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81
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82 else
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83 return Integer (Uval);
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84 end if;
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85 end Scan_Integer;
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86
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87 -------------------
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88 -- Value_Integer --
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89 -------------------
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90
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91 function Value_Integer (Str : String) return Integer is
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92 begin
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93 -- We have to special case Str'Last = Positive'Last because the normal
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94 -- circuit ends up setting P to Str'Last + 1 which is out of bounds. We
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95 -- deal with this by converting to a subtype which fixes the bounds.
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96
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97 if Str'Last = Positive'Last then
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98 declare
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99 subtype NT is String (1 .. Str'Length);
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100 begin
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101 return Value_Integer (NT (Str));
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102 end;
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103
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104 -- Normal case where Str'Last < Positive'Last
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105
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106 else
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107 declare
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108 V : Integer;
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109 P : aliased Integer := Str'First;
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110 begin
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111 V := Scan_Integer (Str, P'Access, Str'Last);
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112 Scan_Trailing_Blanks (Str, P);
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113 return V;
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114 end;
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115 end if;
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116 end Value_Integer;
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117
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118 end System.Val_Int;
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