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f5bc1778 | 1 | /* Decimal 32-bit format module for the decNumber C Library. |
0f5f799a | 2 | Copyright (C) 2005-2013 Free Software Foundation, Inc. |
f5bc1778 DJ |
3 | Contributed by IBM Corporation. Author Mike Cowlishaw. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
168a2f77 | 9 | Software Foundation; either version 3, or (at your option) any later |
f5bc1778 DJ |
10 | version. |
11 | ||
f5bc1778 DJ |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
168a2f77 DD |
17 | Under Section 7 of GPL version 3, you are granted additional |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
f5bc1778 DJ |
25 | |
26 | /* ------------------------------------------------------------------ */ | |
87d32bb7 | 27 | /* Decimal 32-bit format module */ |
f5bc1778 DJ |
28 | /* ------------------------------------------------------------------ */ |
29 | /* This module comprises the routines for decimal32 format numbers. */ | |
30 | /* Conversions are supplied to and from decNumber and String. */ | |
31 | /* */ | |
32 | /* This is used when decNumber provides operations, either for all */ | |
33 | /* operations or as a proxy between decNumber and decSingle. */ | |
34 | /* */ | |
35 | /* Error handling is the same as decNumber (qv.). */ | |
36 | /* ------------------------------------------------------------------ */ | |
37 | #include <string.h> /* [for memset/memcpy] */ | |
38 | #include <stdio.h> /* [for printf] */ | |
39 | ||
87d32bb7 DD |
40 | #include "dconfig.h" /* GCC definitions */ |
41 | #define DECNUMDIGITS 7 /* make decNumbers with space for 7 */ | |
f5bc1778 DJ |
42 | #include "decNumber.h" /* base number library */ |
43 | #include "decNumberLocal.h" /* decNumber local types, etc. */ | |
44 | #include "decimal32.h" /* our primary include */ | |
45 | ||
46 | /* Utility tables and routines [in decimal64.c] */ | |
f5bc1778 DJ |
47 | extern const uInt COMBEXP[32], COMBMSD[32]; |
48 | extern const uShort DPD2BIN[1024]; | |
49 | extern const uShort BIN2DPD[1000]; | |
50 | extern const uByte BIN2CHAR[4001]; | |
51 | ||
52 | extern void decDigitsToDPD(const decNumber *, uInt *, Int); | |
53 | extern void decDigitsFromDPD(decNumber *, const uInt *, Int); | |
54 | ||
55 | #if DECTRACE || DECCHECK | |
56 | void decimal32Show(const decimal32 *); /* for debug */ | |
57 | extern void decNumberShow(const decNumber *); /* .. */ | |
58 | #endif | |
59 | ||
60 | /* Useful macro */ | |
61 | /* Clear a structure (e.g., a decNumber) */ | |
62 | #define DEC_clear(d) memset(d, 0, sizeof(*d)) | |
63 | ||
64 | /* ------------------------------------------------------------------ */ | |
65 | /* decimal32FromNumber -- convert decNumber to decimal32 */ | |
66 | /* */ | |
87d32bb7 | 67 | /* ds is the target decimal32 */ |
f5bc1778 | 68 | /* dn is the source number (assumed valid) */ |
87d32bb7 | 69 | /* set is the context, used only for reporting errors */ |
f5bc1778 DJ |
70 | /* */ |
71 | /* The set argument is used only for status reporting and for the */ | |
72 | /* rounding mode (used if the coefficient is more than DECIMAL32_Pmax */ | |
73 | /* digits or an overflow is detected). If the exponent is out of the */ | |
74 | /* valid range then Overflow or Underflow will be raised. */ | |
75 | /* After Underflow a subnormal result is possible. */ | |
76 | /* */ | |
77 | /* DEC_Clamped is set if the number has to be 'folded down' to fit, */ | |
78 | /* by reducing its exponent and multiplying the coefficient by a */ | |
79 | /* power of ten, or if the exponent on a zero had to be clamped. */ | |
80 | /* ------------------------------------------------------------------ */ | |
81 | decimal32 * decimal32FromNumber(decimal32 *d32, const decNumber *dn, | |
82 | decContext *set) { | |
83 | uInt status=0; /* status accumulator */ | |
84 | Int ae; /* adjusted exponent */ | |
85 | decNumber dw; /* work */ | |
86 | decContext dc; /* .. */ | |
f5bc1778 | 87 | uInt comb, exp; /* .. */ |
87d32bb7 | 88 | uInt uiwork; /* for macros */ |
f5bc1778 DJ |
89 | uInt targ=0; /* target 32-bit */ |
90 | ||
91 | /* If the number has too many digits, or the exponent could be */ | |
92 | /* out of range then reduce the number under the appropriate */ | |
93 | /* constraints. This could push the number to Infinity or zero, */ | |
94 | /* so this check and rounding must be done before generating the */ | |
95 | /* decimal32] */ | |
87d32bb7 DD |
96 | ae=dn->exponent+dn->digits-1; /* [0 if special] */ |
97 | if (dn->digits>DECIMAL32_Pmax /* too many digits */ | |
98 | || ae>DECIMAL32_Emax /* likely overflow */ | |
f5bc1778 DJ |
99 | || ae<DECIMAL32_Emin) { /* likely underflow */ |
100 | decContextDefault(&dc, DEC_INIT_DECIMAL32); /* [no traps] */ | |
101 | dc.round=set->round; /* use supplied rounding */ | |
102 | decNumberPlus(&dw, dn, &dc); /* (round and check) */ | |
103 | /* [this changes -0 to 0, so enforce the sign...] */ | |
104 | dw.bits|=dn->bits&DECNEG; | |
105 | status=dc.status; /* save status */ | |
106 | dn=&dw; /* use the work number */ | |
107 | } /* maybe out of range */ | |
108 | ||
109 | if (dn->bits&DECSPECIAL) { /* a special value */ | |
110 | if (dn->bits&DECINF) targ=DECIMAL_Inf<<24; | |
111 | else { /* sNaN or qNaN */ | |
87d32bb7 | 112 | if ((*dn->lsu!=0 || dn->digits>1) /* non-zero coefficient */ |
f5bc1778 DJ |
113 | && (dn->digits<DECIMAL32_Pmax)) { /* coefficient fits */ |
114 | decDigitsToDPD(dn, &targ, 0); | |
115 | } | |
116 | if (dn->bits&DECNAN) targ|=DECIMAL_NaN<<24; | |
117 | else targ|=DECIMAL_sNaN<<24; | |
118 | } /* a NaN */ | |
119 | } /* special */ | |
120 | ||
121 | else { /* is finite */ | |
122 | if (decNumberIsZero(dn)) { /* is a zero */ | |
123 | /* set and clamp exponent */ | |
124 | if (dn->exponent<-DECIMAL32_Bias) { | |
125 | exp=0; /* low clamp */ | |
126 | status|=DEC_Clamped; | |
127 | } | |
128 | else { | |
129 | exp=dn->exponent+DECIMAL32_Bias; /* bias exponent */ | |
130 | if (exp>DECIMAL32_Ehigh) { /* top clamp */ | |
131 | exp=DECIMAL32_Ehigh; | |
132 | status|=DEC_Clamped; | |
133 | } | |
134 | } | |
135 | comb=(exp>>3) & 0x18; /* msd=0, exp top 2 bits .. */ | |
136 | } | |
137 | else { /* non-zero finite number */ | |
87d32bb7 | 138 | uInt msd; /* work */ |
f5bc1778 DJ |
139 | Int pad=0; /* coefficient pad digits */ |
140 | ||
141 | /* the dn is known to fit, but it may need to be padded */ | |
142 | exp=(uInt)(dn->exponent+DECIMAL32_Bias); /* bias exponent */ | |
143 | if (exp>DECIMAL32_Ehigh) { /* fold-down case */ | |
144 | pad=exp-DECIMAL32_Ehigh; | |
145 | exp=DECIMAL32_Ehigh; /* [to maximum] */ | |
146 | status|=DEC_Clamped; | |
147 | } | |
148 | ||
149 | /* fastpath common case */ | |
150 | if (DECDPUN==3 && pad==0) { | |
151 | targ=BIN2DPD[dn->lsu[0]]; | |
152 | if (dn->digits>3) targ|=(uInt)(BIN2DPD[dn->lsu[1]])<<10; | |
153 | msd=(dn->digits==7 ? dn->lsu[2] : 0); | |
154 | } | |
155 | else { /* general case */ | |
156 | decDigitsToDPD(dn, &targ, pad); | |
157 | /* save and clear the top digit */ | |
158 | msd=targ>>20; | |
159 | targ&=0x000fffff; | |
160 | } | |
161 | ||
162 | /* create the combination field */ | |
163 | if (msd>=8) comb=0x18 | ((exp>>5) & 0x06) | (msd & 0x01); | |
164 | else comb=((exp>>3) & 0x18) | msd; | |
165 | } | |
166 | targ|=comb<<26; /* add combination field .. */ | |
167 | targ|=(exp&0x3f)<<20; /* .. and exponent continuation */ | |
168 | } /* finite */ | |
169 | ||
170 | if (dn->bits&DECNEG) targ|=0x80000000; /* add sign bit */ | |
171 | ||
172 | /* now write to storage; this is endian */ | |
87d32bb7 | 173 | UBFROMUI(d32->bytes, targ); /* directly store the int */ |
f5bc1778 DJ |
174 | |
175 | if (status!=0) decContextSetStatus(set, status); /* pass on status */ | |
176 | /* decimal32Show(d32); */ | |
177 | return d32; | |
178 | } /* decimal32FromNumber */ | |
179 | ||
180 | /* ------------------------------------------------------------------ */ | |
181 | /* decimal32ToNumber -- convert decimal32 to decNumber */ | |
182 | /* d32 is the source decimal32 */ | |
183 | /* dn is the target number, with appropriate space */ | |
184 | /* No error is possible. */ | |
185 | /* ------------------------------------------------------------------ */ | |
186 | decNumber * decimal32ToNumber(const decimal32 *d32, decNumber *dn) { | |
187 | uInt msd; /* coefficient MSD */ | |
188 | uInt exp; /* exponent top two bits */ | |
189 | uInt comb; /* combination field */ | |
190 | uInt sour; /* source 32-bit */ | |
87d32bb7 | 191 | uInt uiwork; /* for macros */ |
f5bc1778 DJ |
192 | |
193 | /* load source from storage; this is endian */ | |
87d32bb7 | 194 | sour=UBTOUI(d32->bytes); /* directly load the int */ |
f5bc1778 | 195 | |
87d32bb7 | 196 | comb=(sour>>26)&0x1f; /* combination field */ |
f5bc1778 DJ |
197 | |
198 | decNumberZero(dn); /* clean number */ | |
199 | if (sour&0x80000000) dn->bits=DECNEG; /* set sign if negative */ | |
200 | ||
201 | msd=COMBMSD[comb]; /* decode the combination field */ | |
202 | exp=COMBEXP[comb]; /* .. */ | |
203 | ||
87d32bb7 | 204 | if (exp==3) { /* is a special */ |
f5bc1778 DJ |
205 | if (msd==0) { |
206 | dn->bits|=DECINF; | |
207 | return dn; /* no coefficient needed */ | |
208 | } | |
209 | else if (sour&0x02000000) dn->bits|=DECSNAN; | |
210 | else dn->bits|=DECNAN; | |
211 | msd=0; /* no top digit */ | |
212 | } | |
213 | else { /* is a finite number */ | |
214 | dn->exponent=(exp<<6)+((sour>>20)&0x3f)-DECIMAL32_Bias; /* unbiased */ | |
215 | } | |
216 | ||
217 | /* get the coefficient */ | |
218 | sour&=0x000fffff; /* clean coefficient continuation */ | |
219 | if (msd) { /* non-zero msd */ | |
220 | sour|=msd<<20; /* prefix to coefficient */ | |
221 | decDigitsFromDPD(dn, &sour, 3); /* process 3 declets */ | |
222 | return dn; | |
223 | } | |
224 | /* msd=0 */ | |
87d32bb7 | 225 | if (!sour) return dn; /* easy: coefficient is 0 */ |
f5bc1778 DJ |
226 | if (sour&0x000ffc00) /* need 2 declets? */ |
227 | decDigitsFromDPD(dn, &sour, 2); /* process 2 declets */ | |
228 | else | |
229 | decDigitsFromDPD(dn, &sour, 1); /* process 1 declet */ | |
230 | return dn; | |
231 | } /* decimal32ToNumber */ | |
232 | ||
233 | /* ------------------------------------------------------------------ */ | |
87d32bb7 | 234 | /* to-scientific-string -- conversion to numeric string */ |
f5bc1778 DJ |
235 | /* to-engineering-string -- conversion to numeric string */ |
236 | /* */ | |
237 | /* decimal32ToString(d32, string); */ | |
87d32bb7 | 238 | /* decimal32ToEngString(d32, string); */ |
f5bc1778 DJ |
239 | /* */ |
240 | /* d32 is the decimal32 format number to convert */ | |
241 | /* string is the string where the result will be laid out */ | |
242 | /* */ | |
243 | /* string must be at least 24 characters */ | |
244 | /* */ | |
245 | /* No error is possible, and no status can be set. */ | |
246 | /* ------------------------------------------------------------------ */ | |
247 | char * decimal32ToEngString(const decimal32 *d32, char *string){ | |
87d32bb7 | 248 | decNumber dn; /* work */ |
f5bc1778 DJ |
249 | decimal32ToNumber(d32, &dn); |
250 | decNumberToEngString(&dn, string); | |
251 | return string; | |
252 | } /* decimal32ToEngString */ | |
253 | ||
254 | char * decimal32ToString(const decimal32 *d32, char *string){ | |
255 | uInt msd; /* coefficient MSD */ | |
256 | Int exp; /* exponent top two bits or full */ | |
257 | uInt comb; /* combination field */ | |
87d32bb7 | 258 | char *cstart; /* coefficient start */ |
f5bc1778 | 259 | char *c; /* output pointer in string */ |
87d32bb7 | 260 | const uByte *u; /* work */ |
f5bc1778 DJ |
261 | char *s, *t; /* .. (source, target) */ |
262 | Int dpd; /* .. */ | |
263 | Int pre, e; /* .. */ | |
87d32bb7 | 264 | uInt uiwork; /* for macros */ |
f5bc1778 DJ |
265 | uInt sour; /* source 32-bit */ |
266 | ||
267 | /* load source from storage; this is endian */ | |
87d32bb7 | 268 | sour=UBTOUI(d32->bytes); /* directly load the int */ |
f5bc1778 DJ |
269 | |
270 | c=string; /* where result will go */ | |
271 | if (((Int)sour)<0) *c++='-'; /* handle sign */ | |
272 | ||
87d32bb7 | 273 | comb=(sour>>26)&0x1f; /* combination field */ |
f5bc1778 DJ |
274 | msd=COMBMSD[comb]; /* decode the combination field */ |
275 | exp=COMBEXP[comb]; /* .. */ | |
276 | ||
277 | if (exp==3) { | |
278 | if (msd==0) { /* infinity */ | |
87d32bb7 | 279 | strcpy(c, "Inf"); |
f5bc1778 DJ |
280 | strcpy(c+3, "inity"); |
281 | return string; /* easy */ | |
282 | } | |
283 | if (sour&0x02000000) *c++='s'; /* sNaN */ | |
284 | strcpy(c, "NaN"); /* complete word */ | |
285 | c+=3; /* step past */ | |
286 | if ((sour&0x000fffff)==0) return string; /* zero payload */ | |
287 | /* otherwise drop through to add integer; set correct exp */ | |
288 | exp=0; msd=0; /* setup for following code */ | |
289 | } | |
290 | else exp=(exp<<6)+((sour>>20)&0x3f)-DECIMAL32_Bias; /* unbiased */ | |
291 | ||
292 | /* convert 7 digits of significand to characters */ | |
293 | cstart=c; /* save start of coefficient */ | |
294 | if (msd) *c++='0'+(char)msd; /* non-zero most significant digit */ | |
295 | ||
296 | /* Now decode the declets. After extracting each one, it is */ | |
297 | /* decoded to binary and then to a 4-char sequence by table lookup; */ | |
298 | /* the 4-chars are a 1-char length (significant digits, except 000 */ | |
299 | /* has length 0). This allows us to left-align the first declet */ | |
300 | /* with non-zero content, then remaining ones are full 3-char */ | |
301 | /* length. We use fixed-length memcpys because variable-length */ | |
302 | /* causes a subroutine call in GCC. (These are length 4 for speed */ | |
303 | /* and are safe because the array has an extra terminator byte.) */ | |
87d32bb7 | 304 | #define dpd2char u=&BIN2CHAR[DPD2BIN[dpd]*4]; \ |
f5bc1778 DJ |
305 | if (c!=cstart) {memcpy(c, u+1, 4); c+=3;} \ |
306 | else if (*u) {memcpy(c, u+4-*u, 4); c+=*u;} | |
307 | ||
87d32bb7 | 308 | dpd=(sour>>10)&0x3ff; /* declet 1 */ |
f5bc1778 DJ |
309 | dpd2char; |
310 | dpd=(sour)&0x3ff; /* declet 2 */ | |
311 | dpd2char; | |
312 | ||
313 | if (c==cstart) *c++='0'; /* all zeros -- make 0 */ | |
314 | ||
87d32bb7 | 315 | if (exp==0) { /* integer or NaN case -- easy */ |
f5bc1778 DJ |
316 | *c='\0'; /* terminate */ |
317 | return string; | |
318 | } | |
319 | ||
320 | /* non-0 exponent */ | |
321 | e=0; /* assume no E */ | |
322 | pre=c-cstart+exp; | |
323 | /* [here, pre-exp is the digits count (==1 for zero)] */ | |
324 | if (exp>0 || pre<-5) { /* need exponential form */ | |
325 | e=pre-1; /* calculate E value */ | |
326 | pre=1; /* assume one digit before '.' */ | |
327 | } /* exponential form */ | |
328 | ||
329 | /* modify the coefficient, adding 0s, '.', and E+nn as needed */ | |
330 | s=c-1; /* source (LSD) */ | |
331 | if (pre>0) { /* ddd.ddd (plain), perhaps with E */ | |
332 | char *dotat=cstart+pre; | |
333 | if (dotat<c) { /* if embedded dot needed... */ | |
334 | t=c; /* target */ | |
335 | for (; s>=dotat; s--, t--) *t=*s; /* open the gap; leave t at gap */ | |
336 | *t='.'; /* insert the dot */ | |
337 | c++; /* length increased by one */ | |
338 | } | |
339 | ||
340 | /* finally add the E-part, if needed; it will never be 0, and has */ | |
341 | /* a maximum length of 3 digits (E-101 case) */ | |
342 | if (e!=0) { | |
87d32bb7 DD |
343 | *c++='E'; /* starts with E */ |
344 | *c++='+'; /* assume positive */ | |
f5bc1778 DJ |
345 | if (e<0) { |
346 | *(c-1)='-'; /* oops, need '-' */ | |
347 | e=-e; /* uInt, please */ | |
348 | } | |
87d32bb7 | 349 | u=&BIN2CHAR[e*4]; /* -> length byte */ |
f5bc1778 DJ |
350 | memcpy(c, u+4-*u, 4); /* copy fixed 4 characters [is safe] */ |
351 | c+=*u; /* bump pointer appropriately */ | |
352 | } | |
353 | *c='\0'; /* add terminator */ | |
354 | /*printf("res %s\n", string); */ | |
355 | return string; | |
356 | } /* pre>0 */ | |
357 | ||
358 | /* -5<=pre<=0: here for plain 0.ddd or 0.000ddd forms (can never have E) */ | |
359 | t=c+1-pre; | |
360 | *(t+1)='\0'; /* can add terminator now */ | |
361 | for (; s>=cstart; s--, t--) *t=*s; /* shift whole coefficient right */ | |
362 | c=cstart; | |
363 | *c++='0'; /* always starts with 0. */ | |
364 | *c++='.'; | |
365 | for (; pre<0; pre++) *c++='0'; /* add any 0's after '.' */ | |
366 | /*printf("res %s\n", string); */ | |
367 | return string; | |
368 | } /* decimal32ToString */ | |
369 | ||
370 | /* ------------------------------------------------------------------ */ | |
371 | /* to-number -- conversion from numeric string */ | |
372 | /* */ | |
373 | /* decimal32FromString(result, string, set); */ | |
374 | /* */ | |
375 | /* result is the decimal32 format number which gets the result of */ | |
376 | /* the conversion */ | |
377 | /* *string is the character string which should contain a valid */ | |
378 | /* number (which may be a special value) */ | |
87d32bb7 | 379 | /* set is the context */ |
f5bc1778 DJ |
380 | /* */ |
381 | /* The context is supplied to this routine is used for error handling */ | |
382 | /* (setting of status and traps) and for the rounding mode, only. */ | |
383 | /* If an error occurs, the result will be a valid decimal32 NaN. */ | |
384 | /* ------------------------------------------------------------------ */ | |
385 | decimal32 * decimal32FromString(decimal32 *result, const char *string, | |
386 | decContext *set) { | |
387 | decContext dc; /* work */ | |
87d32bb7 | 388 | decNumber dn; /* .. */ |
f5bc1778 DJ |
389 | |
390 | decContextDefault(&dc, DEC_INIT_DECIMAL32); /* no traps, please */ | |
391 | dc.round=set->round; /* use supplied rounding */ | |
392 | ||
393 | decNumberFromString(&dn, string, &dc); /* will round if needed */ | |
394 | decimal32FromNumber(result, &dn, &dc); | |
395 | if (dc.status!=0) { /* something happened */ | |
396 | decContextSetStatus(set, dc.status); /* .. pass it on */ | |
397 | } | |
398 | return result; | |
399 | } /* decimal32FromString */ | |
400 | ||
401 | /* ------------------------------------------------------------------ */ | |
402 | /* decimal32IsCanonical -- test whether encoding is canonical */ | |
403 | /* d32 is the source decimal32 */ | |
87d32bb7 | 404 | /* returns 1 if the encoding of d32 is canonical, 0 otherwise */ |
f5bc1778 DJ |
405 | /* No error is possible. */ |
406 | /* ------------------------------------------------------------------ */ | |
87d32bb7 DD |
407 | uInt decimal32IsCanonical(const decimal32 *d32) { |
408 | decNumber dn; /* work */ | |
f5bc1778 DJ |
409 | decimal32 canon; /* .. */ |
410 | decContext dc; /* .. */ | |
411 | decContextDefault(&dc, DEC_INIT_DECIMAL32); | |
412 | decimal32ToNumber(d32, &dn); | |
413 | decimal32FromNumber(&canon, &dn, &dc);/* canon will now be canonical */ | |
414 | return memcmp(d32, &canon, DECIMAL32_Bytes)==0; | |
415 | } /* decimal32IsCanonical */ | |
416 | ||
417 | /* ------------------------------------------------------------------ */ | |
418 | /* decimal32Canonical -- copy an encoding, ensuring it is canonical */ | |
419 | /* d32 is the source decimal32 */ | |
420 | /* result is the target (may be the same decimal32) */ | |
421 | /* returns result */ | |
422 | /* No error is possible. */ | |
423 | /* ------------------------------------------------------------------ */ | |
424 | decimal32 * decimal32Canonical(decimal32 *result, const decimal32 *d32) { | |
87d32bb7 | 425 | decNumber dn; /* work */ |
f5bc1778 DJ |
426 | decContext dc; /* .. */ |
427 | decContextDefault(&dc, DEC_INIT_DECIMAL32); | |
428 | decimal32ToNumber(d32, &dn); | |
429 | decimal32FromNumber(result, &dn, &dc);/* result will now be canonical */ | |
430 | return result; | |
431 | } /* decimal32Canonical */ | |
432 | ||
433 | #if DECTRACE || DECCHECK | |
434 | /* Macros for accessing decimal32 fields. These assume the argument | |
435 | is a reference (pointer) to the decimal32 structure, and the | |
436 | decimal32 is in network byte order (big-endian) */ | |
437 | /* Get sign */ | |
438 | #define decimal32Sign(d) ((unsigned)(d)->bytes[0]>>7) | |
439 | ||
440 | /* Get combination field */ | |
441 | #define decimal32Comb(d) (((d)->bytes[0] & 0x7c)>>2) | |
442 | ||
443 | /* Get exponent continuation [does not remove bias] */ | |
444 | #define decimal32ExpCon(d) ((((d)->bytes[0] & 0x03)<<4) \ | |
445 | | ((unsigned)(d)->bytes[1]>>4)) | |
446 | ||
447 | /* Set sign [this assumes sign previously 0] */ | |
448 | #define decimal32SetSign(d, b) { \ | |
449 | (d)->bytes[0]|=((unsigned)(b)<<7);} | |
450 | ||
451 | /* Set exponent continuation [does not apply bias] */ | |
452 | /* This assumes range has been checked and exponent previously 0; */ | |
453 | /* type of exponent must be unsigned */ | |
454 | #define decimal32SetExpCon(d, e) { \ | |
87d32bb7 DD |
455 | (d)->bytes[0]|=(uByte)((e)>>4); \ |
456 | (d)->bytes[1]|=(uByte)(((e)&0x0F)<<4);} | |
f5bc1778 DJ |
457 | |
458 | /* ------------------------------------------------------------------ */ | |
459 | /* decimal32Show -- display a decimal32 in hexadecimal [debug aid] */ | |
460 | /* d32 -- the number to show */ | |
461 | /* ------------------------------------------------------------------ */ | |
462 | /* Also shows sign/cob/expconfields extracted - valid bigendian only */ | |
463 | void decimal32Show(const decimal32 *d32) { | |
464 | char buf[DECIMAL32_Bytes*2+1]; | |
465 | Int i, j=0; | |
466 | ||
467 | if (DECLITEND) { | |
468 | for (i=0; i<DECIMAL32_Bytes; i++, j+=2) { | |
469 | sprintf(&buf[j], "%02x", d32->bytes[3-i]); | |
470 | } | |
471 | printf(" D32> %s [S:%d Cb:%02x Ec:%02x] LittleEndian\n", buf, | |
472 | d32->bytes[3]>>7, (d32->bytes[3]>>2)&0x1f, | |
473 | ((d32->bytes[3]&0x3)<<4)| (d32->bytes[2]>>4)); | |
474 | } | |
475 | else { | |
476 | for (i=0; i<DECIMAL32_Bytes; i++, j+=2) { | |
477 | sprintf(&buf[j], "%02x", d32->bytes[i]); | |
478 | } | |
479 | printf(" D32> %s [S:%d Cb:%02x Ec:%02x] BigEndian\n", buf, | |
480 | decimal32Sign(d32), decimal32Comb(d32), decimal32ExpCon(d32)); | |
481 | } | |
482 | } /* decimal32Show */ | |
483 | #endif |