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 . M O D U L A R  _ A U X    --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2018, 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
32with Ada.Wide_Wide_Text_IO.Generic_Aux; use Ada.Wide_Wide_Text_IO.Generic_Aux;
33
34with System.Img_BIU;   use System.Img_BIU;
35with System.Img_Uns;   use System.Img_Uns;
36with System.Img_LLB;   use System.Img_LLB;
37with System.Img_LLU;   use System.Img_LLU;
38with System.Img_LLW;   use System.Img_LLW;
39with System.Img_WIU;   use System.Img_WIU;
40with System.Val_Uns;   use System.Val_Uns;
41with System.Val_LLU;   use System.Val_LLU;
42
43package body Ada.Wide_Wide_Text_IO.Modular_Aux is
44
45   use System.Unsigned_Types;
46
47   -----------------------
48   -- Local Subprograms --
49   -----------------------
50
51   procedure Load_Modular
52     (File : File_Type;
53      Buf  : out String;
54      Ptr  : in out Natural);
55   --  This is an auxiliary routine that is used to load an possibly signed
56   --  modular literal value from the input file into Buf, starting at Ptr + 1.
57   --  Ptr is left set to the last character stored.
58
59   -------------
60   -- Get_LLU --
61   -------------
62
63   procedure Get_LLU
64     (File  : File_Type;
65      Item  : out Long_Long_Unsigned;
66      Width : Field)
67   is
68      Buf  : String (1 .. Field'Last);
69      Stop : Integer := 0;
70      Ptr  : aliased Integer := 1;
71
72   begin
73      if Width /= 0 then
74         Load_Width (File, Width, Buf, Stop);
75         String_Skip (Buf, Ptr);
76      else
77         Load_Modular (File, Buf, Stop);
78      end if;
79
80      Item := Scan_Long_Long_Unsigned (Buf, Ptr'Access, Stop);
81      Check_End_Of_Field (Buf, Stop, Ptr, Width);
82   end Get_LLU;
83
84   -------------
85   -- Get_Uns --
86   -------------
87
88   procedure Get_Uns
89     (File  : File_Type;
90      Item  : out Unsigned;
91      Width : Field)
92   is
93      Buf  : String (1 .. Field'Last);
94      Stop : Integer := 0;
95      Ptr  : aliased Integer := 1;
96
97   begin
98      if Width /= 0 then
99         Load_Width (File, Width, Buf, Stop);
100         String_Skip (Buf, Ptr);
101      else
102         Load_Modular (File, Buf, Stop);
103      end if;
104
105      Item := Scan_Unsigned (Buf, Ptr'Access, Stop);
106      Check_End_Of_Field (Buf, Stop, Ptr, Width);
107   end Get_Uns;
108
109   --------------
110   -- Gets_LLU --
111   --------------
112
113   procedure Gets_LLU
114     (From : String;
115      Item : out Long_Long_Unsigned;
116      Last : out Positive)
117   is
118      Pos : aliased Integer;
119
120   begin
121      String_Skip (From, Pos);
122      Item := Scan_Long_Long_Unsigned (From, Pos'Access, From'Last);
123      Last := Pos - 1;
124
125   exception
126      when Constraint_Error =>
127         raise Data_Error;
128   end Gets_LLU;
129
130   --------------
131   -- Gets_Uns --
132   --------------
133
134   procedure Gets_Uns
135     (From : String;
136      Item : out Unsigned;
137      Last : out Positive)
138   is
139      Pos : aliased Integer;
140
141   begin
142      String_Skip (From, Pos);
143      Item := Scan_Unsigned (From, Pos'Access, From'Last);
144      Last := Pos - 1;
145
146   exception
147      when Constraint_Error =>
148         raise Data_Error;
149   end Gets_Uns;
150
151   ------------------
152   -- Load_Modular --
153   ------------------
154
155   procedure Load_Modular
156     (File : File_Type;
157      Buf  : out String;
158      Ptr  : in out Natural)
159   is
160      Hash_Loc : Natural;
161      Loaded   : Boolean;
162
163   begin
164      Load_Skip (File);
165
166      --  Note: it is a bit strange to allow a minus sign here, but it seems
167      --  consistent with the general behavior expected by the ACVC tests
168      --  which is to scan past junk and then signal data error, see ACVC
169      --  test CE3704F, case (6), which is for signed integer exponents,
170      --  which seems a similar case.
171
172      Load (File, Buf, Ptr, '+', '-');
173      Load_Digits (File, Buf, Ptr, Loaded);
174
175      if Loaded then
176
177         --  Deal with based case. We recognize either the standard '#' or the
178         --  allowed alternative replacement ':' (see RM J.2(3)).
179
180         Load (File, Buf, Ptr, '#', ':', Loaded);
181
182         if Loaded then
183            Hash_Loc := Ptr;
184            Load_Extended_Digits (File, Buf, Ptr);
185            Load (File, Buf, Ptr, Buf (Hash_Loc));
186         end if;
187
188         Load (File, Buf, Ptr, 'E', 'e', Loaded);
189
190         if Loaded then
191
192            --  Note: it is strange to allow a minus sign, since the syntax
193            --  does not, but that is what ACVC test CE3704F, case (6) wants
194            --  for the signed case, and there seems no good reason to treat
195            --  exponents differently for the signed and unsigned cases.
196
197            Load (File, Buf, Ptr, '+', '-');
198            Load_Digits (File, Buf, Ptr);
199         end if;
200      end if;
201   end Load_Modular;
202
203   -------------
204   -- Put_LLU --
205   -------------
206
207   procedure Put_LLU
208     (File  : File_Type;
209      Item  : Long_Long_Unsigned;
210      Width : Field;
211      Base  : Number_Base)
212   is
213      Buf : String (1 .. Field'Last);
214      Ptr : Natural := 0;
215
216   begin
217      if Base = 10 and then Width = 0 then
218         Set_Image_Long_Long_Unsigned (Item, Buf, Ptr);
219      elsif Base = 10 then
220         Set_Image_Width_Long_Long_Unsigned (Item, Width, Buf, Ptr);
221      else
222         Set_Image_Based_Long_Long_Unsigned (Item, Base, Width, Buf, Ptr);
223      end if;
224
225      Put_Item (File, Buf (1 .. Ptr));
226   end Put_LLU;
227
228   -------------
229   -- Put_Uns --
230   -------------
231
232   procedure Put_Uns
233     (File  : File_Type;
234      Item  : Unsigned;
235      Width : Field;
236      Base  : Number_Base)
237   is
238      Buf : String (1 .. Field'Last);
239      Ptr : Natural := 0;
240
241   begin
242      if Base = 10 and then Width = 0 then
243         Set_Image_Unsigned (Item, Buf, Ptr);
244      elsif Base = 10 then
245         Set_Image_Width_Unsigned (Item, Width, Buf, Ptr);
246      else
247         Set_Image_Based_Unsigned (Item, Base, Width, Buf, Ptr);
248      end if;
249
250      Put_Item (File, Buf (1 .. Ptr));
251   end Put_Uns;
252
253   --------------
254   -- Puts_LLU --
255   --------------
256
257   procedure Puts_LLU
258     (To   : out String;
259      Item : Long_Long_Unsigned;
260      Base : Number_Base)
261   is
262      Buf : String (1 .. Field'Last);
263      Ptr : Natural := 0;
264
265   begin
266      if Base = 10 then
267         Set_Image_Width_Long_Long_Unsigned (Item, To'Length, Buf, Ptr);
268      else
269         Set_Image_Based_Long_Long_Unsigned (Item, Base, To'Length, Buf, Ptr);
270      end if;
271
272      if Ptr > To'Length then
273         raise Layout_Error;
274      else
275         To (To'First .. To'First + Ptr - 1) := Buf (1 .. Ptr);
276      end if;
277   end Puts_LLU;
278
279   --------------
280   -- Puts_Uns --
281   --------------
282
283   procedure Puts_Uns
284     (To   : out String;
285      Item : Unsigned;
286      Base : Number_Base)
287   is
288      Buf : String (1 .. Field'Last);
289      Ptr : Natural := 0;
290
291   begin
292      if Base = 10 then
293         Set_Image_Width_Unsigned (Item, To'Length, Buf, Ptr);
294      else
295         Set_Image_Based_Unsigned (Item, Base, To'Length, Buf, Ptr);
296      end if;
297
298      if Ptr > To'Length then
299         raise Layout_Error;
300      else
301         To (To'First .. To'First + Ptr - 1) := Buf (1 .. Ptr);
302      end if;
303   end Puts_Uns;
304
305end Ada.Wide_Wide_Text_IO.Modular_Aux;
306