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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- A D A . W I D E _ T E X T _ I O . F L O A T _ A U X --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2007, 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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
21 -- --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
28 -- --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
31 -- --
32 ------------------------------------------------------------------------------
34 with Ada.Wide_Text_IO.Generic_Aux; use Ada.Wide_Text_IO.Generic_Aux;
36 with System.Img_Real; use System.Img_Real;
37 with System.Val_Real; use System.Val_Real;
39 package body Ada.Wide_Text_IO.Float_Aux is
41 ---------
42 -- Get --
43 ---------
45 procedure Get
46 (File : File_Type;
47 Item : out Long_Long_Float;
48 Width : Field)
50 Buf : String (1 .. Field'Last);
51 Stop : Integer := 0;
52 Ptr : aliased Integer := 1;
54 begin
55 if Width /= 0 then
56 Load_Width (File, Width, Buf, Stop);
57 String_Skip (Buf, Ptr);
58 else
59 Load_Real (File, Buf, Stop);
60 end if;
62 Item := Scan_Real (Buf, Ptr'Access, Stop);
64 Check_End_Of_Field (Buf, Stop, Ptr, Width);
65 end Get;
67 ----------
68 -- Gets --
69 ----------
71 procedure Gets
72 (From : String;
73 Item : out Long_Long_Float;
74 Last : out Positive)
76 Pos : aliased Integer;
78 begin
79 String_Skip (From, Pos);
80 Item := Scan_Real (From, Pos'Access, From'Last);
81 Last := Pos - 1;
83 exception
84 when Constraint_Error =>
85 raise Data_Error;
86 end Gets;
88 ---------------
89 -- Load_Real --
90 ---------------
92 procedure Load_Real
93 (File : File_Type;
94 Buf : out String;
95 Ptr : in out Natural)
97 Loaded : Boolean;
99 begin
100 -- Skip initial blanks and load possible sign
102 Load_Skip (File);
103 Load (File, Buf, Ptr, '+', '-');
105 -- Case of .nnnn
107 Load (File, Buf, Ptr, '.', Loaded);
109 if Loaded then
110 Load_Digits (File, Buf, Ptr, Loaded);
112 -- Hopeless junk if no digits loaded
114 if not Loaded then
115 return;
116 end if;
118 -- Otherwise must have digits to start
120 else
121 Load_Digits (File, Buf, Ptr, Loaded);
123 -- Hopeless junk if no digits loaded
125 if not Loaded then
126 return;
127 end if;
129 -- Based cases
131 Load (File, Buf, Ptr, '#', ':', Loaded);
133 if Loaded then
135 -- Case of nnn#.xxx#
137 Load (File, Buf, Ptr, '.', Loaded);
139 if Loaded then
140 Load_Extended_Digits (File, Buf, Ptr);
141 Load (File, Buf, Ptr, '#', ':');
143 -- Case of nnn#xxx.[xxx]# or nnn#xxx#
145 else
146 Load_Extended_Digits (File, Buf, Ptr);
147 Load (File, Buf, Ptr, '.', Loaded);
149 if Loaded then
150 Load_Extended_Digits (File, Buf, Ptr);
151 end if;
153 -- As usual, it seems strange to allow mixed base characters,
154 -- but that is what ACVC tests expect, see CE3804M, case (3).
156 Load (File, Buf, Ptr, '#', ':');
157 end if;
159 -- Case of nnn.[nnn] or nnn
161 else
162 -- Prevent the potential processing of '.' in cases where the
163 -- initial digits have a trailing underscore.
165 if Buf (Ptr) = '_' then
166 return;
167 end if;
169 Load (File, Buf, Ptr, '.', Loaded);
171 if Loaded then
172 Load_Digits (File, Buf, Ptr);
173 end if;
174 end if;
175 end if;
177 -- Deal with exponent
179 Load (File, Buf, Ptr, 'E', 'e', Loaded);
181 if Loaded then
182 Load (File, Buf, Ptr, '+', '-');
183 Load_Digits (File, Buf, Ptr);
184 end if;
185 end Load_Real;
187 ---------
188 -- Put --
189 ---------
191 procedure Put
192 (File : File_Type;
193 Item : Long_Long_Float;
194 Fore : Field;
195 Aft : Field;
196 Exp : Field)
198 Buf : String (1 .. Field'Last);
199 Ptr : Natural := 0;
201 begin
202 Set_Image_Real (Item, Buf, Ptr, Fore, Aft, Exp);
203 Put_Item (File, Buf (1 .. Ptr));
204 end Put;
206 ----------
207 -- Puts --
208 ----------
210 procedure Puts
211 (To : out String;
212 Item : Long_Long_Float;
213 Aft : Field;
214 Exp : Field)
216 Buf : String (1 .. Field'Last);
217 Ptr : Natural := 0;
219 begin
220 Set_Image_Real (Item, Buf, Ptr, Fore => 1, Aft => Aft, Exp => Exp);
222 if Ptr > To'Length then
223 raise Layout_Error;
225 else
226 for J in 1 .. Ptr loop
227 To (To'Last - Ptr + J) := Buf (J);
228 end loop;
230 for J in To'First .. To'Last - Ptr loop
231 To (J) := ' ';
232 end loop;
233 end if;
234 end Puts;
236 end Ada.Wide_Text_IO.Float_Aux;