File : a-ztdeau.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- A D A . W I D E _ W I D E _ 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.Wide_Wide_Text_IO.Generic_Aux; use Ada.Wide_Wide_Text_IO.Generic_Aux;
33 with Ada.Wide_Wide_Text_IO.Float_Aux; use Ada.Wide_Wide_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.Wide_Wide_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
121 end Gets_Dec;
122
123 --------------
124 -- Gets_LLD --
125 --------------
126
127 function Gets_LLD
128 (From : String;
129 Last : not null access Positive;
130 Scale : Integer) return Long_Long_Integer
131 is
132 Pos : aliased Integer;
133 Item : Long_Long_Integer;
134
135 begin
136 String_Skip (From, Pos);
137 Item := Scan_Long_Long_Decimal (From, Pos'Access, From'Last, Scale);
138 Last.all := Pos - 1;
139 return Item;
140
141 exception
142 when Constraint_Error =>
143 Last.all := Pos - 1;
144 raise Data_Error;
145
146 end Gets_LLD;
147
148 -------------
149 -- Put_Dec --
150 -------------
151
152 procedure Put_Dec
153 (File : File_Type;
154 Item : Integer;
155 Fore : Field;
156 Aft : Field;
157 Exp : Field;
158 Scale : Integer)
159 is
160 Buf : String (1 .. Field'Last);
161 Ptr : Natural := 0;
162
163 begin
164 Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
165 Put_Item (File, Buf (1 .. Ptr));
166 end Put_Dec;
167
168 -------------
169 -- Put_LLD --
170 -------------
171
172 procedure Put_LLD
173 (File : File_Type;
174 Item : Long_Long_Integer;
175 Fore : Field;
176 Aft : Field;
177 Exp : Field;
178 Scale : Integer)
179 is
180 Buf : String (1 .. Field'Last);
181 Ptr : Natural := 0;
182
183 begin
184 Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
185 Put_Item (File, Buf (1 .. Ptr));
186 end Put_LLD;
187
188 --------------
189 -- Puts_Dec --
190 --------------
191
192 procedure Puts_Dec
193 (To : out String;
194 Item : Integer;
195 Aft : Field;
196 Exp : Field;
197 Scale : Integer)
198 is
199 Buf : String (1 .. Field'Last);
200 Fore : Integer;
201 Ptr : Natural := 0;
202
203 begin
204 -- Compute Fore, allowing for Aft digits and the decimal dot
205
206 Fore := To'Length - Field'Max (1, Aft) - 1;
207
208 -- Allow for Exp and two more for E+ or E- if exponent present
209
210 if Exp /= 0 then
211 Fore := Fore - 2 - Exp;
212 end if;
213
214 -- Make sure we have enough room
215
216 if Fore < 1 then
217 raise Layout_Error;
218 end if;
219
220 -- Do the conversion and check length of result
221
222 Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
223
224 if Ptr > To'Length then
225 raise Layout_Error;
226 else
227 To := Buf (1 .. Ptr);
228 end if;
229 end Puts_Dec;
230
231 --------------
232 -- Puts_Dec --
233 --------------
234
235 procedure Puts_LLD
236 (To : out String;
237 Item : Long_Long_Integer;
238 Aft : Field;
239 Exp : Field;
240 Scale : Integer)
241 is
242 Buf : String (1 .. Field'Last);
243 Fore : Integer;
244 Ptr : Natural := 0;
245
246 begin
247 Fore :=
248 (if Exp = 0 then To'Length - 1 - Aft else To'Length - 2 - Aft - Exp);
249
250 if Fore < 1 then
251 raise Layout_Error;
252 end if;
253
254 Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
255
256 if Ptr > To'Length then
257 raise Layout_Error;
258 else
259 To := Buf (1 .. Ptr);
260 end if;
261 end Puts_LLD;
262
263 end Ada.Wide_Wide_Text_IO.Decimal_Aux;