projects / thirdparty / gcc.git / blame
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|---|---|---|
| cacbc350 RK |
1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT COMPILER COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- S Y S T E M . V A L _ I N T -- | |
| 6 | -- -- | |
| 7 | -- B o d y -- | |
| 8 | -- -- | |
| 4b490c1e | 9 | -- Copyright (C) 1992-2020, Free Software Foundation, Inc. -- |
| cacbc350 RK |
10 | -- -- |
| 11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 748086b7 | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| cacbc350 RK |
14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| 15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 748086b7 JJ |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| 17 | -- -- | |
| 18 | -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 | -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 | -- version 3.1, as published by the Free Software Foundation. -- | |
| 21 | -- -- | |
| 22 | -- You should have received a copy of the GNU General Public License and -- | |
| 23 | -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 24 | -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 25 | -- <http://www.gnu.org/licenses/>. -- | |
| cacbc350 RK |
26 | -- -- |
| 27 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 71ff80dc | 28 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| cacbc350 RK |
29 | -- -- |
| 30 | ------------------------------------------------------------------------------ | |
| 31 | ||
| 32 | with System.Unsigned_Types; use System.Unsigned_Types; | |
| 33 | with System.Val_Uns; use System.Val_Uns; | |
| 34 | with System.Val_Util; use System.Val_Util; | |
| 35 | ||
| 36 | package body System.Val_Int is | |
| 37 | ||
| 38 | ------------------ | |
| 39 | -- Scan_Integer -- | |
| 40 | ------------------ | |
| 41 | ||
| 42 | function Scan_Integer | |
| 9de61fcb | 43 | (Str : String; |
| d90e94c7 | 44 | Ptr : not null access Integer; |
| 9de61fcb | 45 | Max : Integer) return Integer |
| cacbc350 RK |
46 | is |
| 47 | Uval : Unsigned; | |
| 48 | -- Unsigned result | |
| 49 | ||
| 50 | Minus : Boolean := False; | |
| 51 | -- Set to True if minus sign is present, otherwise to False | |
| 52 | ||
| 53 | Start : Positive; | |
| 54 | -- Saves location of first non-blank (not used in this case) | |
| 55 | ||
| 56 | begin | |
| 57 | Scan_Sign (Str, Ptr, Max, Minus, Start); | |
| bfe7c10c BD |
58 | |
| 59 | if Str (Ptr.all) not in '0' .. '9' then | |
| 60 | Ptr.all := Start; | |
| 37ae92c4 | 61 | Bad_Value (Str); |
| bfe7c10c BD |
62 | end if; |
| 63 | ||
| 64 | Uval := Scan_Raw_Unsigned (Str, Ptr, Max); | |
| cacbc350 RK |
65 | |
| 66 | -- Deal with overflow cases, and also with maximum negative number | |
| 67 | ||
| 68 | if Uval > Unsigned (Integer'Last) then | |
| 69 | if Minus and then Uval = Unsigned (-(Integer'First)) then | |
| 70 | return Integer'First; | |
| 71 | else | |
| 37ae92c4 | 72 | Bad_Value (Str); |
| cacbc350 RK |
73 | end if; |
| 74 | ||
| 75 | -- Negative values | |
| 76 | ||
| 77 | elsif Minus then | |
| 78 | return -(Integer (Uval)); | |
| 79 | ||
| 80 | -- Positive values | |
| 81 | ||
| 82 | else | |
| 83 | return Integer (Uval); | |
| 84 | end if; | |
| cacbc350 RK |
85 | end Scan_Integer; |
| 86 | ||
| 87 | ------------------- | |
| 88 | -- Value_Integer -- | |
| 89 | ------------------- | |
| 90 | ||
| 91 | function Value_Integer (Str : String) return Integer is | |
| cacbc350 | 92 | begin |
| 8d1359c7 AC |
93 | -- We have to special case Str'Last = Positive'Last because the normal |
| 94 | -- circuit ends up setting P to Str'Last + 1 which is out of bounds. We | |
| 95 | -- deal with this by converting to a subtype which fixes the bounds. | |
| 96 | ||
| 97 | if Str'Last = Positive'Last then | |
| 98 | declare | |
| 99 | subtype NT is String (1 .. Str'Length); | |
| 100 | begin | |
| 101 | return Value_Integer (NT (Str)); | |
| 102 | end; | |
| 103 | ||
| 104 | -- Normal case where Str'Last < Positive'Last | |
| 105 | ||
| 106 | else | |
| 107 | declare | |
| 108 | V : Integer; | |
| 109 | P : aliased Integer := Str'First; | |
| 110 | begin | |
| 21db8699 | 111 | V := Scan_Integer (Str, P'Access, Str'Last); |
| 8d1359c7 AC |
112 | Scan_Trailing_Blanks (Str, P); |
| 113 | return V; | |
| 114 | end; | |
| 115 | end if; | |
| cacbc350 RK |
116 | end Value_Integer; |
| 117 | ||
| 118 | end System.Val_Int; |