File : a-tideau.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- A D A . T E X T _ I O . D E C I M A L _ A U X --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2009, 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 -- --
19 -- --
20 -- --
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 Ada.Text_IO.Generic_Aux; use Ada.Text_IO.Generic_Aux;
33 with Ada.Text_IO.Float_Aux; use Ada.Text_IO.Float_Aux;
34
35 with System.Img_Dec; use System.Img_Dec;
36 with System.Img_LLD; use System.Img_LLD;
37 with System.Val_Dec; use System.Val_Dec;
38 with System.Val_LLD; use System.Val_LLD;
39
40 package body Ada.Text_IO.Decimal_Aux is
41
42 -------------
43 -- Get_Dec --
44 -------------
45
46 function Get_Dec
47 (File : File_Type;
48 Width : Field;
49 Scale : Integer) return Integer
50 is
51 Buf : String (1 .. Field'Last);
52 Ptr : aliased Integer;
53 Stop : Integer := 0;
54 Item : Integer;
55
56 begin
57 if Width /= 0 then
58 Load_Width (File, Width, Buf, Stop);
59 String_Skip (Buf, Ptr);
60 else
61 Load_Real (File, Buf, Stop);
62 Ptr := 1;
63 end if;
64
65 Item := Scan_Decimal (Buf, Ptr'Access, Stop, Scale);
66 Check_End_Of_Field (Buf, Stop, Ptr, Width);
67 return Item;
68 end Get_Dec;
69
70 -------------
71 -- Get_LLD --
72 -------------
73
74 function Get_LLD
75 (File : File_Type;
76 Width : Field;
77 Scale : Integer) return Long_Long_Integer
78 is
79 Buf : String (1 .. Field'Last);
80 Ptr : aliased Integer;
81 Stop : Integer := 0;
82 Item : Long_Long_Integer;
83
84 begin
85 if Width /= 0 then
86 Load_Width (File, Width, Buf, Stop);
87 String_Skip (Buf, Ptr);
88 else
89 Load_Real (File, Buf, Stop);
90 Ptr := 1;
91 end if;
92
93 Item := Scan_Long_Long_Decimal (Buf, Ptr'Access, Stop, Scale);
94 Check_End_Of_Field (Buf, Stop, Ptr, Width);
95 return Item;
96 end Get_LLD;
97
98 --------------
99 -- Gets_Dec --
100 --------------
101
102 function Gets_Dec
103 (From : String;
104 Last : not null access Positive;
105 Scale : Integer) return Integer
106 is
107 Pos : aliased Integer;
108 Item : Integer;
109
110 begin
111 String_Skip (From, Pos);
112 Item := Scan_Decimal (From, Pos'Access, From'Last, Scale);
113 Last.all := Pos - 1;
114 return Item;
115
116 exception
117 when Constraint_Error =>
118 Last.all := Pos - 1;
119 raise Data_Error;
120 end Gets_Dec;
121
122 --------------
123 -- Gets_LLD --
124 --------------
125
126 function Gets_LLD
127 (From : String;
128 Last : not null access Positive;
129 Scale : Integer) return Long_Long_Integer
130 is
131 Pos : aliased Integer;
132 Item : Long_Long_Integer;
133
134 begin
135 String_Skip (From, Pos);
136 Item := Scan_Long_Long_Decimal (From, Pos'Access, From'Last, Scale);
137 Last.all := Pos - 1;
138 return Item;
139
140 exception
141 when Constraint_Error =>
142 Last.all := Pos - 1;
143 raise Data_Error;
144 end Gets_LLD;
145
146 -------------
147 -- Put_Dec --
148 -------------
149
150 procedure Put_Dec
151 (File : File_Type;
152 Item : Integer;
153 Fore : Field;
154 Aft : Field;
155 Exp : Field;
156 Scale : Integer)
157 is
158 Buf : String (1 .. Field'Last);
159 Ptr : Natural := 0;
160
161 begin
162 Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
163 Put_Item (File, Buf (1 .. Ptr));
164 end Put_Dec;
165
166 -------------
167 -- Put_LLD --
168 -------------
169
170 procedure Put_LLD
171 (File : File_Type;
172 Item : Long_Long_Integer;
173 Fore : Field;
174 Aft : Field;
175 Exp : Field;
176 Scale : Integer)
177 is
178 Buf : String (1 .. Field'Last);
179 Ptr : Natural := 0;
180
181 begin
182 Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
183 Put_Item (File, Buf (1 .. Ptr));
184 end Put_LLD;
185
186 --------------
187 -- Puts_Dec --
188 --------------
189
190 procedure Puts_Dec
191 (To : out String;
192 Item : Integer;
193 Aft : Field;
194 Exp : Field;
195 Scale : Integer)
196 is
197 Buf : String (1 .. Field'Last);
198 Fore : Integer;
199 Ptr : Natural := 0;
200
201 begin
202 -- Compute Fore, allowing for Aft digits and the decimal dot
203
204 Fore := To'Length - Field'Max (1, Aft) - 1;
205
206 -- Allow for Exp and two more for E+ or E- if exponent present
207
208 if Exp /= 0 then
209 Fore := Fore - 2 - Exp;
210 end if;
211
212 -- Make sure we have enough room
213
214 if Fore < 1 then
215 raise Layout_Error;
216 end if;
217
218 -- Do the conversion and check length of result
219
220 Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
221
222 if Ptr > To'Length then
223 raise Layout_Error;
224 else
225 To := Buf (1 .. Ptr);
226 end if;
227 end Puts_Dec;
228
229 --------------
230 -- Puts_Dec --
231 --------------
232
233 procedure Puts_LLD
234 (To : out String;
235 Item : Long_Long_Integer;
236 Aft : Field;
237 Exp : Field;
238 Scale : Integer)
239 is
240 Buf : String (1 .. Field'Last);
241 Fore : Integer;
242 Ptr : Natural := 0;
243
244 begin
245 Fore :=
246 (if Exp = 0 then To'Length - 1 - Aft else To'Length - 2 - Aft - Exp);
247
248 if Fore < 1 then
249 raise Layout_Error;
250 end if;
251
252 Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
253
254 if Ptr > To'Length then
255 raise Layout_Error;
256 else
257 To := Buf (1 .. Ptr);
258 end if;
259 end Puts_LLD;
260
261 end Ada.Text_IO.Decimal_Aux;