Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-valint.adb @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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68:561a7518be6b | 111:04ced10e8804 |
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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 -- -- | |
9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. -- | |
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- -- | |
13 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
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 -- | |
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/>. -- | |
26 -- -- | |
27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
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 | |
43 (Str : String; | |
44 Ptr : not null access Integer; | |
45 Max : Integer) return Integer | |
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); | |
58 | |
59 if Str (Ptr.all) not in '0' .. '9' then | |
60 Ptr.all := Start; | |
61 Bad_Value (Str); | |
62 end if; | |
63 | |
64 Uval := Scan_Raw_Unsigned (Str, Ptr, Max); | |
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 | |
72 Bad_Value (Str); | |
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; | |
85 end Scan_Integer; | |
86 | |
87 ------------------- | |
88 -- Value_Integer -- | |
89 ------------------- | |
90 | |
91 function Value_Integer (Str : String) return Integer is | |
92 begin | |
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 | |
111 V := Scan_Integer (Str, P'Access, Str'Last); | |
112 Scan_Trailing_Blanks (Str, P); | |
113 return V; | |
114 end; | |
115 end if; | |
116 end Value_Integer; | |
117 | |
118 end System.Val_Int; |