Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/i-pacdec.adb @ 111:04ced10e8804
gcc 7
author | kono |
---|---|
date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
comparison
equal
deleted
inserted
replaced
68:561a7518be6b | 111:04ced10e8804 |
---|---|
1 ------------------------------------------------------------------------------ | |
2 -- -- | |
3 -- GNAT COMPILER COMPONENTS -- | |
4 -- -- | |
5 -- I N T E R F A C E S . P A C K E D _ D E C I M A L -- | |
6 -- -- | |
7 -- B o d y -- | |
8 -- (Version for IBM Mainframe Packed Decimal Format) -- | |
9 -- -- | |
10 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. -- | |
11 -- -- | |
12 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
13 -- terms of the GNU General Public License as published by the Free Soft- -- | |
14 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
17 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
18 -- -- | |
19 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
20 -- additional permissions described in the GCC Runtime Library Exception, -- | |
21 -- version 3.1, as published by the Free Software Foundation. -- | |
22 -- -- | |
23 -- You should have received a copy of the GNU General Public License and -- | |
24 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
26 -- <http://www.gnu.org/licenses/>. -- | |
27 -- -- | |
28 -- GNAT was originally developed by the GNAT team at New York University. -- | |
29 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
30 -- -- | |
31 ------------------------------------------------------------------------------ | |
32 | |
33 with System; use System; | |
34 | |
35 with Ada.Unchecked_Conversion; | |
36 | |
37 package body Interfaces.Packed_Decimal is | |
38 | |
39 type Packed is array (Byte_Length) of Unsigned_8; | |
40 -- The type used internally to represent packed decimal | |
41 | |
42 type Packed_Ptr is access Packed; | |
43 function To_Packed_Ptr is | |
44 new Ada.Unchecked_Conversion (Address, Packed_Ptr); | |
45 | |
46 -- The following array is used to convert a value in the range 0-99 to | |
47 -- a packed decimal format with two hexadecimal nibbles. It is worth | |
48 -- using table look up in this direction because divides are expensive. | |
49 | |
50 Packed_Byte : constant array (00 .. 99) of Unsigned_8 := | |
51 (16#00#, 16#01#, 16#02#, 16#03#, 16#04#, | |
52 16#05#, 16#06#, 16#07#, 16#08#, 16#09#, | |
53 16#10#, 16#11#, 16#12#, 16#13#, 16#14#, | |
54 16#15#, 16#16#, 16#17#, 16#18#, 16#19#, | |
55 16#20#, 16#21#, 16#22#, 16#23#, 16#24#, | |
56 16#25#, 16#26#, 16#27#, 16#28#, 16#29#, | |
57 16#30#, 16#31#, 16#32#, 16#33#, 16#34#, | |
58 16#35#, 16#36#, 16#37#, 16#38#, 16#39#, | |
59 16#40#, 16#41#, 16#42#, 16#43#, 16#44#, | |
60 16#45#, 16#46#, 16#47#, 16#48#, 16#49#, | |
61 16#50#, 16#51#, 16#52#, 16#53#, 16#54#, | |
62 16#55#, 16#56#, 16#57#, 16#58#, 16#59#, | |
63 16#60#, 16#61#, 16#62#, 16#63#, 16#64#, | |
64 16#65#, 16#66#, 16#67#, 16#68#, 16#69#, | |
65 16#70#, 16#71#, 16#72#, 16#73#, 16#74#, | |
66 16#75#, 16#76#, 16#77#, 16#78#, 16#79#, | |
67 16#80#, 16#81#, 16#82#, 16#83#, 16#84#, | |
68 16#85#, 16#86#, 16#87#, 16#88#, 16#89#, | |
69 16#90#, 16#91#, 16#92#, 16#93#, 16#94#, | |
70 16#95#, 16#96#, 16#97#, 16#98#, 16#99#); | |
71 | |
72 --------------------- | |
73 -- Int32_To_Packed -- | |
74 --------------------- | |
75 | |
76 procedure Int32_To_Packed (V : Integer_32; P : System.Address; D : D32) is | |
77 PP : constant Packed_Ptr := To_Packed_Ptr (P); | |
78 Empty_Nibble : constant Boolean := ((D rem 2) = 0); | |
79 B : constant Byte_Length := (D / 2) + 1; | |
80 VV : Integer_32 := V; | |
81 | |
82 begin | |
83 -- Deal with sign byte first | |
84 | |
85 if VV >= 0 then | |
86 PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#C#; | |
87 VV := VV / 10; | |
88 | |
89 else | |
90 VV := -VV; | |
91 PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#D#; | |
92 end if; | |
93 | |
94 for J in reverse B - 1 .. 2 loop | |
95 if VV = 0 then | |
96 for K in 1 .. J loop | |
97 PP (K) := 16#00#; | |
98 end loop; | |
99 | |
100 return; | |
101 | |
102 else | |
103 PP (J) := Packed_Byte (Integer (VV rem 100)); | |
104 VV := VV / 100; | |
105 end if; | |
106 end loop; | |
107 | |
108 -- Deal with leading byte | |
109 | |
110 if Empty_Nibble then | |
111 if VV > 9 then | |
112 raise Constraint_Error; | |
113 else | |
114 PP (1) := Unsigned_8 (VV); | |
115 end if; | |
116 | |
117 else | |
118 if VV > 99 then | |
119 raise Constraint_Error; | |
120 else | |
121 PP (1) := Packed_Byte (Integer (VV)); | |
122 end if; | |
123 end if; | |
124 | |
125 end Int32_To_Packed; | |
126 | |
127 --------------------- | |
128 -- Int64_To_Packed -- | |
129 --------------------- | |
130 | |
131 procedure Int64_To_Packed (V : Integer_64; P : System.Address; D : D64) is | |
132 PP : constant Packed_Ptr := To_Packed_Ptr (P); | |
133 Empty_Nibble : constant Boolean := ((D rem 2) = 0); | |
134 B : constant Byte_Length := (D / 2) + 1; | |
135 VV : Integer_64 := V; | |
136 | |
137 begin | |
138 -- Deal with sign byte first | |
139 | |
140 if VV >= 0 then | |
141 PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#C#; | |
142 VV := VV / 10; | |
143 | |
144 else | |
145 VV := -VV; | |
146 PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#D#; | |
147 end if; | |
148 | |
149 for J in reverse B - 1 .. 2 loop | |
150 if VV = 0 then | |
151 for K in 1 .. J loop | |
152 PP (K) := 16#00#; | |
153 end loop; | |
154 | |
155 return; | |
156 | |
157 else | |
158 PP (J) := Packed_Byte (Integer (VV rem 100)); | |
159 VV := VV / 100; | |
160 end if; | |
161 end loop; | |
162 | |
163 -- Deal with leading byte | |
164 | |
165 if Empty_Nibble then | |
166 if VV > 9 then | |
167 raise Constraint_Error; | |
168 else | |
169 PP (1) := Unsigned_8 (VV); | |
170 end if; | |
171 | |
172 else | |
173 if VV > 99 then | |
174 raise Constraint_Error; | |
175 else | |
176 PP (1) := Packed_Byte (Integer (VV)); | |
177 end if; | |
178 end if; | |
179 | |
180 end Int64_To_Packed; | |
181 | |
182 --------------------- | |
183 -- Packed_To_Int32 -- | |
184 --------------------- | |
185 | |
186 function Packed_To_Int32 (P : System.Address; D : D32) return Integer_32 is | |
187 PP : constant Packed_Ptr := To_Packed_Ptr (P); | |
188 Empty_Nibble : constant Boolean := ((D mod 2) = 0); | |
189 B : constant Byte_Length := (D / 2) + 1; | |
190 V : Integer_32; | |
191 Dig : Unsigned_8; | |
192 Sign : Unsigned_8; | |
193 J : Positive; | |
194 | |
195 begin | |
196 -- Cases where there is an unused (zero) nibble in the first byte. | |
197 -- Deal with the single digit nibble at the right of this byte | |
198 | |
199 if Empty_Nibble then | |
200 V := Integer_32 (PP (1)); | |
201 J := 2; | |
202 | |
203 if V > 9 then | |
204 raise Constraint_Error; | |
205 end if; | |
206 | |
207 -- Cases where all nibbles are used | |
208 | |
209 else | |
210 V := 0; | |
211 J := 1; | |
212 end if; | |
213 | |
214 -- Loop to process bytes containing two digit nibbles | |
215 | |
216 while J < B loop | |
217 Dig := Shift_Right (PP (J), 4); | |
218 | |
219 if Dig > 9 then | |
220 raise Constraint_Error; | |
221 else | |
222 V := V * 10 + Integer_32 (Dig); | |
223 end if; | |
224 | |
225 Dig := PP (J) and 16#0F#; | |
226 | |
227 if Dig > 9 then | |
228 raise Constraint_Error; | |
229 else | |
230 V := V * 10 + Integer_32 (Dig); | |
231 end if; | |
232 | |
233 J := J + 1; | |
234 end loop; | |
235 | |
236 -- Deal with digit nibble in sign byte | |
237 | |
238 Dig := Shift_Right (PP (J), 4); | |
239 | |
240 if Dig > 9 then | |
241 raise Constraint_Error; | |
242 else | |
243 V := V * 10 + Integer_32 (Dig); | |
244 end if; | |
245 | |
246 Sign := PP (J) and 16#0F#; | |
247 | |
248 -- Process sign nibble (deal with most common cases first) | |
249 | |
250 if Sign = 16#C# then | |
251 return V; | |
252 | |
253 elsif Sign = 16#D# then | |
254 return -V; | |
255 | |
256 elsif Sign = 16#B# then | |
257 return -V; | |
258 | |
259 elsif Sign >= 16#A# then | |
260 return V; | |
261 | |
262 else | |
263 raise Constraint_Error; | |
264 end if; | |
265 end Packed_To_Int32; | |
266 | |
267 --------------------- | |
268 -- Packed_To_Int64 -- | |
269 --------------------- | |
270 | |
271 function Packed_To_Int64 (P : System.Address; D : D64) return Integer_64 is | |
272 PP : constant Packed_Ptr := To_Packed_Ptr (P); | |
273 Empty_Nibble : constant Boolean := ((D mod 2) = 0); | |
274 B : constant Byte_Length := (D / 2) + 1; | |
275 V : Integer_64; | |
276 Dig : Unsigned_8; | |
277 Sign : Unsigned_8; | |
278 J : Positive; | |
279 | |
280 begin | |
281 -- Cases where there is an unused (zero) nibble in the first byte. | |
282 -- Deal with the single digit nibble at the right of this byte | |
283 | |
284 if Empty_Nibble then | |
285 V := Integer_64 (PP (1)); | |
286 J := 2; | |
287 | |
288 if V > 9 then | |
289 raise Constraint_Error; | |
290 end if; | |
291 | |
292 -- Cases where all nibbles are used | |
293 | |
294 else | |
295 J := 1; | |
296 V := 0; | |
297 end if; | |
298 | |
299 -- Loop to process bytes containing two digit nibbles | |
300 | |
301 while J < B loop | |
302 Dig := Shift_Right (PP (J), 4); | |
303 | |
304 if Dig > 9 then | |
305 raise Constraint_Error; | |
306 else | |
307 V := V * 10 + Integer_64 (Dig); | |
308 end if; | |
309 | |
310 Dig := PP (J) and 16#0F#; | |
311 | |
312 if Dig > 9 then | |
313 raise Constraint_Error; | |
314 else | |
315 V := V * 10 + Integer_64 (Dig); | |
316 end if; | |
317 | |
318 J := J + 1; | |
319 end loop; | |
320 | |
321 -- Deal with digit nibble in sign byte | |
322 | |
323 Dig := Shift_Right (PP (J), 4); | |
324 | |
325 if Dig > 9 then | |
326 raise Constraint_Error; | |
327 else | |
328 V := V * 10 + Integer_64 (Dig); | |
329 end if; | |
330 | |
331 Sign := PP (J) and 16#0F#; | |
332 | |
333 -- Process sign nibble (deal with most common cases first) | |
334 | |
335 if Sign = 16#C# then | |
336 return V; | |
337 | |
338 elsif Sign = 16#D# then | |
339 return -V; | |
340 | |
341 elsif Sign = 16#B# then | |
342 return -V; | |
343 | |
344 elsif Sign >= 16#A# then | |
345 return V; | |
346 | |
347 else | |
348 raise Constraint_Error; | |
349 end if; | |
350 end Packed_To_Int64; | |
351 | |
352 end Interfaces.Packed_Decimal; |