Commit | Line | Data |
---|---|---|
98994639 HS |
1 | /* numeric.c |
2 | * | |
663f364b | 3 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, |
1129b882 | 4 | * 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others |
98994639 HS |
5 | * |
6 | * You may distribute under the terms of either the GNU General Public | |
7 | * License or the Artistic License, as specified in the README file. | |
8 | * | |
9 | */ | |
10 | ||
11 | /* | |
4ac71550 TC |
12 | * "That only makes eleven (plus one mislaid) and not fourteen, |
13 | * unless wizards count differently to other people." --Beorn | |
14 | * | |
15 | * [p.115 of _The Hobbit_: "Queer Lodgings"] | |
98994639 HS |
16 | */ |
17 | ||
ccfc67b7 JH |
18 | /* |
19 | =head1 Numeric functions | |
166f8a29 DM |
20 | |
21 | This file contains all the stuff needed by perl for manipulating numeric | |
22 | values, including such things as replacements for the OS's atof() function | |
23 | ||
24 | =cut | |
25 | ||
ccfc67b7 JH |
26 | */ |
27 | ||
98994639 HS |
28 | #include "EXTERN.h" |
29 | #define PERL_IN_NUMERIC_C | |
30 | #include "perl.h" | |
31 | ||
32 | U32 | |
33 | Perl_cast_ulong(pTHX_ NV f) | |
34 | { | |
96a5add6 | 35 | PERL_UNUSED_CONTEXT; |
98994639 HS |
36 | if (f < 0.0) |
37 | return f < I32_MIN ? (U32) I32_MIN : (U32)(I32) f; | |
38 | if (f < U32_MAX_P1) { | |
39 | #if CASTFLAGS & 2 | |
40 | if (f < U32_MAX_P1_HALF) | |
41 | return (U32) f; | |
42 | f -= U32_MAX_P1_HALF; | |
43 | return ((U32) f) | (1 + U32_MAX >> 1); | |
44 | #else | |
45 | return (U32) f; | |
46 | #endif | |
47 | } | |
48 | return f > 0 ? U32_MAX : 0 /* NaN */; | |
49 | } | |
50 | ||
51 | I32 | |
52 | Perl_cast_i32(pTHX_ NV f) | |
53 | { | |
96a5add6 | 54 | PERL_UNUSED_CONTEXT; |
98994639 HS |
55 | if (f < I32_MAX_P1) |
56 | return f < I32_MIN ? I32_MIN : (I32) f; | |
57 | if (f < U32_MAX_P1) { | |
58 | #if CASTFLAGS & 2 | |
59 | if (f < U32_MAX_P1_HALF) | |
60 | return (I32)(U32) f; | |
61 | f -= U32_MAX_P1_HALF; | |
62 | return (I32)(((U32) f) | (1 + U32_MAX >> 1)); | |
63 | #else | |
64 | return (I32)(U32) f; | |
65 | #endif | |
66 | } | |
67 | return f > 0 ? (I32)U32_MAX : 0 /* NaN */; | |
68 | } | |
69 | ||
70 | IV | |
71 | Perl_cast_iv(pTHX_ NV f) | |
72 | { | |
96a5add6 | 73 | PERL_UNUSED_CONTEXT; |
98994639 HS |
74 | if (f < IV_MAX_P1) |
75 | return f < IV_MIN ? IV_MIN : (IV) f; | |
76 | if (f < UV_MAX_P1) { | |
77 | #if CASTFLAGS & 2 | |
78 | /* For future flexibility allowing for sizeof(UV) >= sizeof(IV) */ | |
79 | if (f < UV_MAX_P1_HALF) | |
80 | return (IV)(UV) f; | |
81 | f -= UV_MAX_P1_HALF; | |
82 | return (IV)(((UV) f) | (1 + UV_MAX >> 1)); | |
83 | #else | |
84 | return (IV)(UV) f; | |
85 | #endif | |
86 | } | |
87 | return f > 0 ? (IV)UV_MAX : 0 /* NaN */; | |
88 | } | |
89 | ||
90 | UV | |
91 | Perl_cast_uv(pTHX_ NV f) | |
92 | { | |
96a5add6 | 93 | PERL_UNUSED_CONTEXT; |
98994639 HS |
94 | if (f < 0.0) |
95 | return f < IV_MIN ? (UV) IV_MIN : (UV)(IV) f; | |
96 | if (f < UV_MAX_P1) { | |
97 | #if CASTFLAGS & 2 | |
98 | if (f < UV_MAX_P1_HALF) | |
99 | return (UV) f; | |
100 | f -= UV_MAX_P1_HALF; | |
101 | return ((UV) f) | (1 + UV_MAX >> 1); | |
102 | #else | |
103 | return (UV) f; | |
104 | #endif | |
105 | } | |
106 | return f > 0 ? UV_MAX : 0 /* NaN */; | |
107 | } | |
108 | ||
53305cf1 NC |
109 | /* |
110 | =for apidoc grok_bin | |
98994639 | 111 | |
53305cf1 NC |
112 | converts a string representing a binary number to numeric form. |
113 | ||
114 | On entry I<start> and I<*len> give the string to scan, I<*flags> gives | |
115 | conversion flags, and I<result> should be NULL or a pointer to an NV. | |
116 | The scan stops at the end of the string, or the first invalid character. | |
7b667b5f MHM |
117 | Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in I<*flags>, encountering an |
118 | invalid character will also trigger a warning. | |
119 | On return I<*len> is set to the length of the scanned string, | |
120 | and I<*flags> gives output flags. | |
53305cf1 | 121 | |
7fc63493 | 122 | If the value is <= C<UV_MAX> it is returned as a UV, the output flags are clear, |
53305cf1 NC |
123 | and nothing is written to I<*result>. If the value is > UV_MAX C<grok_bin> |
124 | returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags, | |
125 | and writes the value to I<*result> (or the value is discarded if I<result> | |
126 | is NULL). | |
127 | ||
7b667b5f | 128 | The binary number may optionally be prefixed with "0b" or "b" unless |
a4c04bdc NC |
129 | C<PERL_SCAN_DISALLOW_PREFIX> is set in I<*flags> on entry. If |
130 | C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the binary | |
53305cf1 NC |
131 | number may use '_' characters to separate digits. |
132 | ||
133 | =cut | |
134 | */ | |
135 | ||
136 | UV | |
7918f24d NC |
137 | Perl_grok_bin(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) |
138 | { | |
53305cf1 NC |
139 | const char *s = start; |
140 | STRLEN len = *len_p; | |
141 | UV value = 0; | |
142 | NV value_nv = 0; | |
143 | ||
144 | const UV max_div_2 = UV_MAX / 2; | |
585ec06d | 145 | const bool allow_underscores = (bool)(*flags & PERL_SCAN_ALLOW_UNDERSCORES); |
53305cf1 | 146 | bool overflowed = FALSE; |
7fc63493 | 147 | char bit; |
53305cf1 | 148 | |
7918f24d NC |
149 | PERL_ARGS_ASSERT_GROK_BIN; |
150 | ||
a4c04bdc NC |
151 | if (!(*flags & PERL_SCAN_DISALLOW_PREFIX)) { |
152 | /* strip off leading b or 0b. | |
153 | for compatibility silently suffer "b" and "0b" as valid binary | |
154 | numbers. */ | |
155 | if (len >= 1) { | |
156 | if (s[0] == 'b') { | |
157 | s++; | |
158 | len--; | |
159 | } | |
160 | else if (len >= 2 && s[0] == '0' && s[1] == 'b') { | |
161 | s+=2; | |
162 | len-=2; | |
163 | } | |
164 | } | |
53305cf1 NC |
165 | } |
166 | ||
7fc63493 | 167 | for (; len-- && (bit = *s); s++) { |
53305cf1 NC |
168 | if (bit == '0' || bit == '1') { |
169 | /* Write it in this wonky order with a goto to attempt to get the | |
170 | compiler to make the common case integer-only loop pretty tight. | |
171 | With gcc seems to be much straighter code than old scan_bin. */ | |
172 | redo: | |
173 | if (!overflowed) { | |
174 | if (value <= max_div_2) { | |
175 | value = (value << 1) | (bit - '0'); | |
176 | continue; | |
177 | } | |
178 | /* Bah. We're just overflowed. */ | |
179 | if (ckWARN_d(WARN_OVERFLOW)) | |
9014280d | 180 | Perl_warner(aTHX_ packWARN(WARN_OVERFLOW), |
53305cf1 NC |
181 | "Integer overflow in binary number"); |
182 | overflowed = TRUE; | |
183 | value_nv = (NV) value; | |
184 | } | |
185 | value_nv *= 2.0; | |
98994639 | 186 | /* If an NV has not enough bits in its mantissa to |
d1be9408 | 187 | * represent a UV this summing of small low-order numbers |
98994639 HS |
188 | * is a waste of time (because the NV cannot preserve |
189 | * the low-order bits anyway): we could just remember when | |
53305cf1 | 190 | * did we overflow and in the end just multiply value_nv by the |
98994639 | 191 | * right amount. */ |
53305cf1 NC |
192 | value_nv += (NV)(bit - '0'); |
193 | continue; | |
194 | } | |
195 | if (bit == '_' && len && allow_underscores && (bit = s[1]) | |
196 | && (bit == '0' || bit == '1')) | |
98994639 HS |
197 | { |
198 | --len; | |
199 | ++s; | |
53305cf1 | 200 | goto redo; |
98994639 | 201 | } |
94dd8549 | 202 | if (!(*flags & PERL_SCAN_SILENT_ILLDIGIT) && ckWARN(WARN_DIGIT)) |
9014280d | 203 | Perl_warner(aTHX_ packWARN(WARN_DIGIT), |
53305cf1 NC |
204 | "Illegal binary digit '%c' ignored", *s); |
205 | break; | |
98994639 | 206 | } |
53305cf1 NC |
207 | |
208 | if ( ( overflowed && value_nv > 4294967295.0) | |
98994639 | 209 | #if UVSIZE > 4 |
53305cf1 | 210 | || (!overflowed && value > 0xffffffff ) |
98994639 HS |
211 | #endif |
212 | ) { | |
213 | if (ckWARN(WARN_PORTABLE)) | |
9014280d | 214 | Perl_warner(aTHX_ packWARN(WARN_PORTABLE), |
53305cf1 NC |
215 | "Binary number > 0b11111111111111111111111111111111 non-portable"); |
216 | } | |
217 | *len_p = s - start; | |
218 | if (!overflowed) { | |
219 | *flags = 0; | |
220 | return value; | |
98994639 | 221 | } |
53305cf1 NC |
222 | *flags = PERL_SCAN_GREATER_THAN_UV_MAX; |
223 | if (result) | |
224 | *result = value_nv; | |
225 | return UV_MAX; | |
98994639 HS |
226 | } |
227 | ||
53305cf1 NC |
228 | /* |
229 | =for apidoc grok_hex | |
230 | ||
231 | converts a string representing a hex number to numeric form. | |
232 | ||
233 | On entry I<start> and I<*len> give the string to scan, I<*flags> gives | |
234 | conversion flags, and I<result> should be NULL or a pointer to an NV. | |
7b667b5f MHM |
235 | The scan stops at the end of the string, or the first invalid character. |
236 | Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in I<*flags>, encountering an | |
237 | invalid character will also trigger a warning. | |
238 | On return I<*len> is set to the length of the scanned string, | |
239 | and I<*flags> gives output flags. | |
53305cf1 NC |
240 | |
241 | If the value is <= UV_MAX it is returned as a UV, the output flags are clear, | |
242 | and nothing is written to I<*result>. If the value is > UV_MAX C<grok_hex> | |
243 | returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags, | |
244 | and writes the value to I<*result> (or the value is discarded if I<result> | |
245 | is NULL). | |
246 | ||
d1be9408 | 247 | The hex number may optionally be prefixed with "0x" or "x" unless |
a4c04bdc NC |
248 | C<PERL_SCAN_DISALLOW_PREFIX> is set in I<*flags> on entry. If |
249 | C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the hex | |
53305cf1 NC |
250 | number may use '_' characters to separate digits. |
251 | ||
252 | =cut | |
253 | */ | |
254 | ||
255 | UV | |
7918f24d NC |
256 | Perl_grok_hex(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) |
257 | { | |
27da23d5 | 258 | dVAR; |
53305cf1 NC |
259 | const char *s = start; |
260 | STRLEN len = *len_p; | |
261 | UV value = 0; | |
262 | NV value_nv = 0; | |
53305cf1 | 263 | const UV max_div_16 = UV_MAX / 16; |
585ec06d | 264 | const bool allow_underscores = (bool)(*flags & PERL_SCAN_ALLOW_UNDERSCORES); |
53305cf1 | 265 | bool overflowed = FALSE; |
98994639 | 266 | |
7918f24d NC |
267 | PERL_ARGS_ASSERT_GROK_HEX; |
268 | ||
a4c04bdc NC |
269 | if (!(*flags & PERL_SCAN_DISALLOW_PREFIX)) { |
270 | /* strip off leading x or 0x. | |
271 | for compatibility silently suffer "x" and "0x" as valid hex numbers. | |
272 | */ | |
273 | if (len >= 1) { | |
274 | if (s[0] == 'x') { | |
275 | s++; | |
276 | len--; | |
277 | } | |
278 | else if (len >= 2 && s[0] == '0' && s[1] == 'x') { | |
279 | s+=2; | |
280 | len-=2; | |
281 | } | |
282 | } | |
98994639 HS |
283 | } |
284 | ||
285 | for (; len-- && *s; s++) { | |
a3b680e6 | 286 | const char *hexdigit = strchr(PL_hexdigit, *s); |
53305cf1 NC |
287 | if (hexdigit) { |
288 | /* Write it in this wonky order with a goto to attempt to get the | |
289 | compiler to make the common case integer-only loop pretty tight. | |
290 | With gcc seems to be much straighter code than old scan_hex. */ | |
291 | redo: | |
292 | if (!overflowed) { | |
293 | if (value <= max_div_16) { | |
294 | value = (value << 4) | ((hexdigit - PL_hexdigit) & 15); | |
295 | continue; | |
296 | } | |
297 | /* Bah. We're just overflowed. */ | |
298 | if (ckWARN_d(WARN_OVERFLOW)) | |
9014280d | 299 | Perl_warner(aTHX_ packWARN(WARN_OVERFLOW), |
53305cf1 NC |
300 | "Integer overflow in hexadecimal number"); |
301 | overflowed = TRUE; | |
302 | value_nv = (NV) value; | |
303 | } | |
304 | value_nv *= 16.0; | |
305 | /* If an NV has not enough bits in its mantissa to | |
d1be9408 | 306 | * represent a UV this summing of small low-order numbers |
53305cf1 NC |
307 | * is a waste of time (because the NV cannot preserve |
308 | * the low-order bits anyway): we could just remember when | |
309 | * did we overflow and in the end just multiply value_nv by the | |
310 | * right amount of 16-tuples. */ | |
311 | value_nv += (NV)((hexdigit - PL_hexdigit) & 15); | |
312 | continue; | |
313 | } | |
314 | if (*s == '_' && len && allow_underscores && s[1] | |
e1ec3a88 | 315 | && (hexdigit = strchr(PL_hexdigit, s[1]))) |
98994639 HS |
316 | { |
317 | --len; | |
318 | ++s; | |
53305cf1 | 319 | goto redo; |
98994639 | 320 | } |
94dd8549 | 321 | if (!(*flags & PERL_SCAN_SILENT_ILLDIGIT) && ckWARN(WARN_DIGIT)) |
9014280d | 322 | Perl_warner(aTHX_ packWARN(WARN_DIGIT), |
53305cf1 NC |
323 | "Illegal hexadecimal digit '%c' ignored", *s); |
324 | break; | |
325 | } | |
326 | ||
327 | if ( ( overflowed && value_nv > 4294967295.0) | |
328 | #if UVSIZE > 4 | |
329 | || (!overflowed && value > 0xffffffff ) | |
330 | #endif | |
331 | ) { | |
332 | if (ckWARN(WARN_PORTABLE)) | |
9014280d | 333 | Perl_warner(aTHX_ packWARN(WARN_PORTABLE), |
53305cf1 NC |
334 | "Hexadecimal number > 0xffffffff non-portable"); |
335 | } | |
336 | *len_p = s - start; | |
337 | if (!overflowed) { | |
338 | *flags = 0; | |
339 | return value; | |
340 | } | |
341 | *flags = PERL_SCAN_GREATER_THAN_UV_MAX; | |
342 | if (result) | |
343 | *result = value_nv; | |
344 | return UV_MAX; | |
345 | } | |
346 | ||
347 | /* | |
348 | =for apidoc grok_oct | |
349 | ||
7b667b5f MHM |
350 | converts a string representing an octal number to numeric form. |
351 | ||
352 | On entry I<start> and I<*len> give the string to scan, I<*flags> gives | |
353 | conversion flags, and I<result> should be NULL or a pointer to an NV. | |
354 | The scan stops at the end of the string, or the first invalid character. | |
355 | Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in I<*flags>, encountering an | |
356 | invalid character will also trigger a warning. | |
357 | On return I<*len> is set to the length of the scanned string, | |
358 | and I<*flags> gives output flags. | |
359 | ||
360 | If the value is <= UV_MAX it is returned as a UV, the output flags are clear, | |
361 | and nothing is written to I<*result>. If the value is > UV_MAX C<grok_oct> | |
362 | returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags, | |
363 | and writes the value to I<*result> (or the value is discarded if I<result> | |
364 | is NULL). | |
365 | ||
366 | If C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the octal | |
367 | number may use '_' characters to separate digits. | |
53305cf1 NC |
368 | |
369 | =cut | |
370 | */ | |
371 | ||
372 | UV | |
7918f24d NC |
373 | Perl_grok_oct(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) |
374 | { | |
53305cf1 NC |
375 | const char *s = start; |
376 | STRLEN len = *len_p; | |
377 | UV value = 0; | |
378 | NV value_nv = 0; | |
53305cf1 | 379 | const UV max_div_8 = UV_MAX / 8; |
585ec06d | 380 | const bool allow_underscores = (bool)(*flags & PERL_SCAN_ALLOW_UNDERSCORES); |
53305cf1 NC |
381 | bool overflowed = FALSE; |
382 | ||
7918f24d NC |
383 | PERL_ARGS_ASSERT_GROK_OCT; |
384 | ||
53305cf1 NC |
385 | for (; len-- && *s; s++) { |
386 | /* gcc 2.95 optimiser not smart enough to figure that this subtraction | |
387 | out front allows slicker code. */ | |
388 | int digit = *s - '0'; | |
389 | if (digit >= 0 && digit <= 7) { | |
390 | /* Write it in this wonky order with a goto to attempt to get the | |
391 | compiler to make the common case integer-only loop pretty tight. | |
392 | */ | |
393 | redo: | |
394 | if (!overflowed) { | |
395 | if (value <= max_div_8) { | |
396 | value = (value << 3) | digit; | |
397 | continue; | |
398 | } | |
399 | /* Bah. We're just overflowed. */ | |
400 | if (ckWARN_d(WARN_OVERFLOW)) | |
9014280d | 401 | Perl_warner(aTHX_ packWARN(WARN_OVERFLOW), |
53305cf1 NC |
402 | "Integer overflow in octal number"); |
403 | overflowed = TRUE; | |
404 | value_nv = (NV) value; | |
405 | } | |
406 | value_nv *= 8.0; | |
98994639 | 407 | /* If an NV has not enough bits in its mantissa to |
d1be9408 | 408 | * represent a UV this summing of small low-order numbers |
98994639 HS |
409 | * is a waste of time (because the NV cannot preserve |
410 | * the low-order bits anyway): we could just remember when | |
53305cf1 NC |
411 | * did we overflow and in the end just multiply value_nv by the |
412 | * right amount of 8-tuples. */ | |
413 | value_nv += (NV)digit; | |
414 | continue; | |
415 | } | |
416 | if (digit == ('_' - '0') && len && allow_underscores | |
417 | && (digit = s[1] - '0') && (digit >= 0 && digit <= 7)) | |
418 | { | |
419 | --len; | |
420 | ++s; | |
421 | goto redo; | |
422 | } | |
423 | /* Allow \octal to work the DWIM way (that is, stop scanning | |
7b667b5f | 424 | * as soon as non-octal characters are seen, complain only if |
53305cf1 NC |
425 | * someone seems to want to use the digits eight and nine). */ |
426 | if (digit == 8 || digit == 9) { | |
94dd8549 | 427 | if (!(*flags & PERL_SCAN_SILENT_ILLDIGIT) && ckWARN(WARN_DIGIT)) |
9014280d | 428 | Perl_warner(aTHX_ packWARN(WARN_DIGIT), |
53305cf1 NC |
429 | "Illegal octal digit '%c' ignored", *s); |
430 | } | |
431 | break; | |
98994639 | 432 | } |
53305cf1 NC |
433 | |
434 | if ( ( overflowed && value_nv > 4294967295.0) | |
98994639 | 435 | #if UVSIZE > 4 |
53305cf1 | 436 | || (!overflowed && value > 0xffffffff ) |
98994639 HS |
437 | #endif |
438 | ) { | |
439 | if (ckWARN(WARN_PORTABLE)) | |
9014280d | 440 | Perl_warner(aTHX_ packWARN(WARN_PORTABLE), |
53305cf1 NC |
441 | "Octal number > 037777777777 non-portable"); |
442 | } | |
443 | *len_p = s - start; | |
444 | if (!overflowed) { | |
445 | *flags = 0; | |
446 | return value; | |
98994639 | 447 | } |
53305cf1 NC |
448 | *flags = PERL_SCAN_GREATER_THAN_UV_MAX; |
449 | if (result) | |
450 | *result = value_nv; | |
451 | return UV_MAX; | |
452 | } | |
453 | ||
454 | /* | |
455 | =for apidoc scan_bin | |
456 | ||
457 | For backwards compatibility. Use C<grok_bin> instead. | |
458 | ||
459 | =for apidoc scan_hex | |
460 | ||
461 | For backwards compatibility. Use C<grok_hex> instead. | |
462 | ||
463 | =for apidoc scan_oct | |
464 | ||
465 | For backwards compatibility. Use C<grok_oct> instead. | |
466 | ||
467 | =cut | |
468 | */ | |
469 | ||
470 | NV | |
73d840c0 | 471 | Perl_scan_bin(pTHX_ const char *start, STRLEN len, STRLEN *retlen) |
53305cf1 NC |
472 | { |
473 | NV rnv; | |
474 | I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0; | |
73d840c0 | 475 | const UV ruv = grok_bin (start, &len, &flags, &rnv); |
53305cf1 | 476 | |
7918f24d NC |
477 | PERL_ARGS_ASSERT_SCAN_BIN; |
478 | ||
53305cf1 NC |
479 | *retlen = len; |
480 | return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv; | |
481 | } | |
482 | ||
483 | NV | |
73d840c0 | 484 | Perl_scan_oct(pTHX_ const char *start, STRLEN len, STRLEN *retlen) |
53305cf1 NC |
485 | { |
486 | NV rnv; | |
487 | I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0; | |
73d840c0 | 488 | const UV ruv = grok_oct (start, &len, &flags, &rnv); |
53305cf1 | 489 | |
7918f24d NC |
490 | PERL_ARGS_ASSERT_SCAN_OCT; |
491 | ||
53305cf1 NC |
492 | *retlen = len; |
493 | return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv; | |
494 | } | |
495 | ||
496 | NV | |
73d840c0 | 497 | Perl_scan_hex(pTHX_ const char *start, STRLEN len, STRLEN *retlen) |
53305cf1 NC |
498 | { |
499 | NV rnv; | |
500 | I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0; | |
73d840c0 | 501 | const UV ruv = grok_hex (start, &len, &flags, &rnv); |
53305cf1 | 502 | |
7918f24d NC |
503 | PERL_ARGS_ASSERT_SCAN_HEX; |
504 | ||
53305cf1 NC |
505 | *retlen = len; |
506 | return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv; | |
98994639 HS |
507 | } |
508 | ||
509 | /* | |
510 | =for apidoc grok_numeric_radix | |
511 | ||
512 | Scan and skip for a numeric decimal separator (radix). | |
513 | ||
514 | =cut | |
515 | */ | |
516 | bool | |
517 | Perl_grok_numeric_radix(pTHX_ const char **sp, const char *send) | |
518 | { | |
519 | #ifdef USE_LOCALE_NUMERIC | |
97aff369 | 520 | dVAR; |
7918f24d NC |
521 | |
522 | PERL_ARGS_ASSERT_GROK_NUMERIC_RADIX; | |
523 | ||
98994639 HS |
524 | if (PL_numeric_radix_sv && IN_LOCALE) { |
525 | STRLEN len; | |
c4420975 | 526 | const char * const radix = SvPV(PL_numeric_radix_sv, len); |
98994639 HS |
527 | if (*sp + len <= send && memEQ(*sp, radix, len)) { |
528 | *sp += len; | |
529 | return TRUE; | |
530 | } | |
531 | } | |
532 | /* always try "." if numeric radix didn't match because | |
533 | * we may have data from different locales mixed */ | |
534 | #endif | |
7918f24d NC |
535 | |
536 | PERL_ARGS_ASSERT_GROK_NUMERIC_RADIX; | |
537 | ||
98994639 HS |
538 | if (*sp < send && **sp == '.') { |
539 | ++*sp; | |
540 | return TRUE; | |
541 | } | |
542 | return FALSE; | |
543 | } | |
544 | ||
545 | /* | |
546 | =for apidoc grok_number | |
547 | ||
548 | Recognise (or not) a number. The type of the number is returned | |
549 | (0 if unrecognised), otherwise it is a bit-ORed combination of | |
550 | IS_NUMBER_IN_UV, IS_NUMBER_GREATER_THAN_UV_MAX, IS_NUMBER_NOT_INT, | |
aa8b85de | 551 | IS_NUMBER_NEG, IS_NUMBER_INFINITY, IS_NUMBER_NAN (defined in perl.h). |
60939fb8 NC |
552 | |
553 | If the value of the number can fit an in UV, it is returned in the *valuep | |
554 | IS_NUMBER_IN_UV will be set to indicate that *valuep is valid, IS_NUMBER_IN_UV | |
555 | will never be set unless *valuep is valid, but *valuep may have been assigned | |
556 | to during processing even though IS_NUMBER_IN_UV is not set on return. | |
557 | If valuep is NULL, IS_NUMBER_IN_UV will be set for the same cases as when | |
558 | valuep is non-NULL, but no actual assignment (or SEGV) will occur. | |
559 | ||
560 | IS_NUMBER_NOT_INT will be set with IS_NUMBER_IN_UV if trailing decimals were | |
561 | seen (in which case *valuep gives the true value truncated to an integer), and | |
562 | IS_NUMBER_NEG if the number is negative (in which case *valuep holds the | |
563 | absolute value). IS_NUMBER_IN_UV is not set if e notation was used or the | |
564 | number is larger than a UV. | |
98994639 HS |
565 | |
566 | =cut | |
567 | */ | |
568 | int | |
569 | Perl_grok_number(pTHX_ const char *pv, STRLEN len, UV *valuep) | |
570 | { | |
60939fb8 | 571 | const char *s = pv; |
c4420975 | 572 | const char * const send = pv + len; |
60939fb8 NC |
573 | const UV max_div_10 = UV_MAX / 10; |
574 | const char max_mod_10 = UV_MAX % 10; | |
575 | int numtype = 0; | |
576 | int sawinf = 0; | |
aa8b85de | 577 | int sawnan = 0; |
60939fb8 | 578 | |
7918f24d NC |
579 | PERL_ARGS_ASSERT_GROK_NUMBER; |
580 | ||
60939fb8 NC |
581 | while (s < send && isSPACE(*s)) |
582 | s++; | |
583 | if (s == send) { | |
584 | return 0; | |
585 | } else if (*s == '-') { | |
586 | s++; | |
587 | numtype = IS_NUMBER_NEG; | |
588 | } | |
589 | else if (*s == '+') | |
590 | s++; | |
591 | ||
592 | if (s == send) | |
593 | return 0; | |
594 | ||
595 | /* next must be digit or the radix separator or beginning of infinity */ | |
596 | if (isDIGIT(*s)) { | |
597 | /* UVs are at least 32 bits, so the first 9 decimal digits cannot | |
598 | overflow. */ | |
599 | UV value = *s - '0'; | |
600 | /* This construction seems to be more optimiser friendly. | |
601 | (without it gcc does the isDIGIT test and the *s - '0' separately) | |
602 | With it gcc on arm is managing 6 instructions (6 cycles) per digit. | |
603 | In theory the optimiser could deduce how far to unroll the loop | |
604 | before checking for overflow. */ | |
58bb9ec3 NC |
605 | if (++s < send) { |
606 | int digit = *s - '0'; | |
60939fb8 NC |
607 | if (digit >= 0 && digit <= 9) { |
608 | value = value * 10 + digit; | |
58bb9ec3 NC |
609 | if (++s < send) { |
610 | digit = *s - '0'; | |
60939fb8 NC |
611 | if (digit >= 0 && digit <= 9) { |
612 | value = value * 10 + digit; | |
58bb9ec3 NC |
613 | if (++s < send) { |
614 | digit = *s - '0'; | |
60939fb8 NC |
615 | if (digit >= 0 && digit <= 9) { |
616 | value = value * 10 + digit; | |
58bb9ec3 NC |
617 | if (++s < send) { |
618 | digit = *s - '0'; | |
60939fb8 NC |
619 | if (digit >= 0 && digit <= 9) { |
620 | value = value * 10 + digit; | |
58bb9ec3 NC |
621 | if (++s < send) { |
622 | digit = *s - '0'; | |
60939fb8 NC |
623 | if (digit >= 0 && digit <= 9) { |
624 | value = value * 10 + digit; | |
58bb9ec3 NC |
625 | if (++s < send) { |
626 | digit = *s - '0'; | |
60939fb8 NC |
627 | if (digit >= 0 && digit <= 9) { |
628 | value = value * 10 + digit; | |
58bb9ec3 NC |
629 | if (++s < send) { |
630 | digit = *s - '0'; | |
60939fb8 NC |
631 | if (digit >= 0 && digit <= 9) { |
632 | value = value * 10 + digit; | |
58bb9ec3 NC |
633 | if (++s < send) { |
634 | digit = *s - '0'; | |
60939fb8 NC |
635 | if (digit >= 0 && digit <= 9) { |
636 | value = value * 10 + digit; | |
58bb9ec3 | 637 | if (++s < send) { |
60939fb8 NC |
638 | /* Now got 9 digits, so need to check |
639 | each time for overflow. */ | |
58bb9ec3 | 640 | digit = *s - '0'; |
60939fb8 NC |
641 | while (digit >= 0 && digit <= 9 |
642 | && (value < max_div_10 | |
643 | || (value == max_div_10 | |
644 | && digit <= max_mod_10))) { | |
645 | value = value * 10 + digit; | |
58bb9ec3 NC |
646 | if (++s < send) |
647 | digit = *s - '0'; | |
60939fb8 NC |
648 | else |
649 | break; | |
650 | } | |
651 | if (digit >= 0 && digit <= 9 | |
51bd16da | 652 | && (s < send)) { |
60939fb8 NC |
653 | /* value overflowed. |
654 | skip the remaining digits, don't | |
655 | worry about setting *valuep. */ | |
656 | do { | |
657 | s++; | |
658 | } while (s < send && isDIGIT(*s)); | |
659 | numtype |= | |
660 | IS_NUMBER_GREATER_THAN_UV_MAX; | |
661 | goto skip_value; | |
662 | } | |
663 | } | |
664 | } | |
98994639 | 665 | } |
60939fb8 NC |
666 | } |
667 | } | |
668 | } | |
669 | } | |
670 | } | |
671 | } | |
672 | } | |
673 | } | |
674 | } | |
675 | } | |
676 | } | |
98994639 | 677 | } |
60939fb8 | 678 | } |
98994639 | 679 | } |
60939fb8 NC |
680 | numtype |= IS_NUMBER_IN_UV; |
681 | if (valuep) | |
682 | *valuep = value; | |
683 | ||
684 | skip_value: | |
685 | if (GROK_NUMERIC_RADIX(&s, send)) { | |
686 | numtype |= IS_NUMBER_NOT_INT; | |
687 | while (s < send && isDIGIT(*s)) /* optional digits after the radix */ | |
688 | s++; | |
98994639 | 689 | } |
60939fb8 NC |
690 | } |
691 | else if (GROK_NUMERIC_RADIX(&s, send)) { | |
692 | numtype |= IS_NUMBER_NOT_INT | IS_NUMBER_IN_UV; /* valuep assigned below */ | |
693 | /* no digits before the radix means we need digits after it */ | |
694 | if (s < send && isDIGIT(*s)) { | |
695 | do { | |
696 | s++; | |
697 | } while (s < send && isDIGIT(*s)); | |
698 | if (valuep) { | |
699 | /* integer approximation is valid - it's 0. */ | |
700 | *valuep = 0; | |
701 | } | |
98994639 | 702 | } |
60939fb8 NC |
703 | else |
704 | return 0; | |
705 | } else if (*s == 'I' || *s == 'i') { | |
706 | s++; if (s == send || (*s != 'N' && *s != 'n')) return 0; | |
707 | s++; if (s == send || (*s != 'F' && *s != 'f')) return 0; | |
708 | s++; if (s < send && (*s == 'I' || *s == 'i')) { | |
709 | s++; if (s == send || (*s != 'N' && *s != 'n')) return 0; | |
710 | s++; if (s == send || (*s != 'I' && *s != 'i')) return 0; | |
711 | s++; if (s == send || (*s != 'T' && *s != 't')) return 0; | |
712 | s++; if (s == send || (*s != 'Y' && *s != 'y')) return 0; | |
713 | s++; | |
98994639 | 714 | } |
60939fb8 | 715 | sawinf = 1; |
aa8b85de JH |
716 | } else if (*s == 'N' || *s == 'n') { |
717 | /* XXX TODO: There are signaling NaNs and quiet NaNs. */ | |
718 | s++; if (s == send || (*s != 'A' && *s != 'a')) return 0; | |
719 | s++; if (s == send || (*s != 'N' && *s != 'n')) return 0; | |
720 | s++; | |
721 | sawnan = 1; | |
722 | } else | |
98994639 | 723 | return 0; |
60939fb8 NC |
724 | |
725 | if (sawinf) { | |
726 | numtype &= IS_NUMBER_NEG; /* Keep track of sign */ | |
727 | numtype |= IS_NUMBER_INFINITY | IS_NUMBER_NOT_INT; | |
aa8b85de JH |
728 | } else if (sawnan) { |
729 | numtype &= IS_NUMBER_NEG; /* Keep track of sign */ | |
730 | numtype |= IS_NUMBER_NAN | IS_NUMBER_NOT_INT; | |
60939fb8 NC |
731 | } else if (s < send) { |
732 | /* we can have an optional exponent part */ | |
733 | if (*s == 'e' || *s == 'E') { | |
734 | /* The only flag we keep is sign. Blow away any "it's UV" */ | |
735 | numtype &= IS_NUMBER_NEG; | |
736 | numtype |= IS_NUMBER_NOT_INT; | |
737 | s++; | |
738 | if (s < send && (*s == '-' || *s == '+')) | |
739 | s++; | |
740 | if (s < send && isDIGIT(*s)) { | |
741 | do { | |
742 | s++; | |
743 | } while (s < send && isDIGIT(*s)); | |
744 | } | |
745 | else | |
746 | return 0; | |
747 | } | |
748 | } | |
749 | while (s < send && isSPACE(*s)) | |
750 | s++; | |
751 | if (s >= send) | |
aa8b85de | 752 | return numtype; |
60939fb8 NC |
753 | if (len == 10 && memEQ(pv, "0 but true", 10)) { |
754 | if (valuep) | |
755 | *valuep = 0; | |
756 | return IS_NUMBER_IN_UV; | |
757 | } | |
758 | return 0; | |
98994639 HS |
759 | } |
760 | ||
4801ca72 | 761 | STATIC NV |
98994639 HS |
762 | S_mulexp10(NV value, I32 exponent) |
763 | { | |
764 | NV result = 1.0; | |
765 | NV power = 10.0; | |
766 | bool negative = 0; | |
767 | I32 bit; | |
768 | ||
769 | if (exponent == 0) | |
770 | return value; | |
20f6aaab | 771 | if (value == 0) |
66a1b24b | 772 | return (NV)0; |
87032ba1 | 773 | |
24866caa | 774 | /* On OpenVMS VAX we by default use the D_FLOAT double format, |
67597c89 | 775 | * and that format does not have *easy* capabilities [1] for |
24866caa CB |
776 | * overflowing doubles 'silently' as IEEE fp does. We also need |
777 | * to support G_FLOAT on both VAX and Alpha, and though the exponent | |
778 | * range is much larger than D_FLOAT it still doesn't do silent | |
779 | * overflow. Therefore we need to detect early whether we would | |
780 | * overflow (this is the behaviour of the native string-to-float | |
781 | * conversion routines, and therefore of native applications, too). | |
67597c89 | 782 | * |
24866caa CB |
783 | * [1] Trying to establish a condition handler to trap floating point |
784 | * exceptions is not a good idea. */ | |
87032ba1 JH |
785 | |
786 | /* In UNICOS and in certain Cray models (such as T90) there is no | |
787 | * IEEE fp, and no way at all from C to catch fp overflows gracefully. | |
788 | * There is something you can do if you are willing to use some | |
789 | * inline assembler: the instruction is called DFI-- but that will | |
790 | * disable *all* floating point interrupts, a little bit too large | |
791 | * a hammer. Therefore we need to catch potential overflows before | |
792 | * it's too late. */ | |
353813d9 HS |
793 | |
794 | #if ((defined(VMS) && !defined(__IEEE_FP)) || defined(_UNICOS)) && defined(NV_MAX_10_EXP) | |
795 | STMT_START { | |
c4420975 | 796 | const NV exp_v = log10(value); |
353813d9 HS |
797 | if (exponent >= NV_MAX_10_EXP || exponent + exp_v >= NV_MAX_10_EXP) |
798 | return NV_MAX; | |
799 | if (exponent < 0) { | |
800 | if (-(exponent + exp_v) >= NV_MAX_10_EXP) | |
801 | return 0.0; | |
802 | while (-exponent >= NV_MAX_10_EXP) { | |
803 | /* combination does not overflow, but 10^(-exponent) does */ | |
804 | value /= 10; | |
805 | ++exponent; | |
806 | } | |
807 | } | |
808 | } STMT_END; | |
87032ba1 JH |
809 | #endif |
810 | ||
353813d9 HS |
811 | if (exponent < 0) { |
812 | negative = 1; | |
813 | exponent = -exponent; | |
814 | } | |
98994639 HS |
815 | for (bit = 1; exponent; bit <<= 1) { |
816 | if (exponent & bit) { | |
817 | exponent ^= bit; | |
818 | result *= power; | |
236f0012 CB |
819 | /* Floating point exceptions are supposed to be turned off, |
820 | * but if we're obviously done, don't risk another iteration. | |
821 | */ | |
822 | if (exponent == 0) break; | |
98994639 HS |
823 | } |
824 | power *= power; | |
825 | } | |
826 | return negative ? value / result : value * result; | |
827 | } | |
828 | ||
829 | NV | |
830 | Perl_my_atof(pTHX_ const char* s) | |
831 | { | |
832 | NV x = 0.0; | |
833 | #ifdef USE_LOCALE_NUMERIC | |
97aff369 | 834 | dVAR; |
7918f24d NC |
835 | |
836 | PERL_ARGS_ASSERT_MY_ATOF; | |
837 | ||
98994639 HS |
838 | if (PL_numeric_local && IN_LOCALE) { |
839 | NV y; | |
840 | ||
841 | /* Scan the number twice; once using locale and once without; | |
842 | * choose the larger result (in absolute value). */ | |
a36244b7 | 843 | Perl_atof2(s, x); |
98994639 | 844 | SET_NUMERIC_STANDARD(); |
a36244b7 | 845 | Perl_atof2(s, y); |
98994639 HS |
846 | SET_NUMERIC_LOCAL(); |
847 | if ((y < 0.0 && y < x) || (y > 0.0 && y > x)) | |
848 | return y; | |
849 | } | |
850 | else | |
a36244b7 | 851 | Perl_atof2(s, x); |
98994639 | 852 | #else |
a36244b7 | 853 | Perl_atof2(s, x); |
98994639 HS |
854 | #endif |
855 | return x; | |
856 | } | |
857 | ||
858 | char* | |
859 | Perl_my_atof2(pTHX_ const char* orig, NV* value) | |
860 | { | |
20f6aaab | 861 | NV result[3] = {0.0, 0.0, 0.0}; |
e1ec3a88 | 862 | const char* s = orig; |
a36244b7 | 863 | #ifdef USE_PERL_ATOF |
20f6aaab | 864 | UV accumulator[2] = {0,0}; /* before/after dp */ |
a36244b7 | 865 | bool negative = 0; |
e1ec3a88 | 866 | const char* send = s + strlen(orig) - 1; |
8194bf88 | 867 | bool seen_digit = 0; |
20f6aaab AS |
868 | I32 exp_adjust[2] = {0,0}; |
869 | I32 exp_acc[2] = {-1, -1}; | |
870 | /* the current exponent adjust for the accumulators */ | |
98994639 | 871 | I32 exponent = 0; |
8194bf88 | 872 | I32 seen_dp = 0; |
20f6aaab AS |
873 | I32 digit = 0; |
874 | I32 old_digit = 0; | |
8194bf88 DM |
875 | I32 sig_digits = 0; /* noof significant digits seen so far */ |
876 | ||
7918f24d NC |
877 | PERL_ARGS_ASSERT_MY_ATOF2; |
878 | ||
8194bf88 DM |
879 | /* There is no point in processing more significant digits |
880 | * than the NV can hold. Note that NV_DIG is a lower-bound value, | |
881 | * while we need an upper-bound value. We add 2 to account for this; | |
882 | * since it will have been conservative on both the first and last digit. | |
883 | * For example a 32-bit mantissa with an exponent of 4 would have | |
884 | * exact values in the set | |
885 | * 4 | |
886 | * 8 | |
887 | * .. | |
888 | * 17179869172 | |
889 | * 17179869176 | |
890 | * 17179869180 | |
891 | * | |
892 | * where for the purposes of calculating NV_DIG we would have to discount | |
893 | * both the first and last digit, since neither can hold all values from | |
894 | * 0..9; but for calculating the value we must examine those two digits. | |
895 | */ | |
896 | #define MAX_SIG_DIGITS (NV_DIG+2) | |
897 | ||
898 | /* the max number we can accumulate in a UV, and still safely do 10*N+9 */ | |
899 | #define MAX_ACCUMULATE ( (UV) ((UV_MAX - 9)/10)) | |
98994639 | 900 | |
96a05aee HS |
901 | /* leading whitespace */ |
902 | while (isSPACE(*s)) | |
903 | ++s; | |
904 | ||
98994639 HS |
905 | /* sign */ |
906 | switch (*s) { | |
907 | case '-': | |
908 | negative = 1; | |
909 | /* fall through */ | |
910 | case '+': | |
911 | ++s; | |
912 | } | |
913 | ||
2b54f59f YST |
914 | /* punt to strtod for NaN/Inf; if no support for it there, tough luck */ |
915 | ||
916 | #ifdef HAS_STRTOD | |
917 | if (*s == 'n' || *s == 'N' || *s == 'i' || *s == 'I') { | |
c042ae3a | 918 | const char *p = negative ? s - 1 : s; |
2b54f59f YST |
919 | char *endp; |
920 | NV rslt; | |
921 | rslt = strtod(p, &endp); | |
922 | if (endp != p) { | |
923 | *value = rslt; | |
924 | return (char *)endp; | |
925 | } | |
926 | } | |
927 | #endif | |
928 | ||
8194bf88 DM |
929 | /* we accumulate digits into an integer; when this becomes too |
930 | * large, we add the total to NV and start again */ | |
98994639 | 931 | |
8194bf88 DM |
932 | while (1) { |
933 | if (isDIGIT(*s)) { | |
934 | seen_digit = 1; | |
20f6aaab | 935 | old_digit = digit; |
8194bf88 | 936 | digit = *s++ - '0'; |
20f6aaab AS |
937 | if (seen_dp) |
938 | exp_adjust[1]++; | |
98994639 | 939 | |
8194bf88 DM |
940 | /* don't start counting until we see the first significant |
941 | * digit, eg the 5 in 0.00005... */ | |
942 | if (!sig_digits && digit == 0) | |
943 | continue; | |
944 | ||
945 | if (++sig_digits > MAX_SIG_DIGITS) { | |
98994639 | 946 | /* limits of precision reached */ |
20f6aaab AS |
947 | if (digit > 5) { |
948 | ++accumulator[seen_dp]; | |
949 | } else if (digit == 5) { | |
950 | if (old_digit % 2) { /* round to even - Allen */ | |
951 | ++accumulator[seen_dp]; | |
952 | } | |
953 | } | |
954 | if (seen_dp) { | |
955 | exp_adjust[1]--; | |
956 | } else { | |
957 | exp_adjust[0]++; | |
958 | } | |
8194bf88 | 959 | /* skip remaining digits */ |
98994639 | 960 | while (isDIGIT(*s)) { |
98994639 | 961 | ++s; |
20f6aaab AS |
962 | if (! seen_dp) { |
963 | exp_adjust[0]++; | |
964 | } | |
98994639 HS |
965 | } |
966 | /* warn of loss of precision? */ | |
98994639 | 967 | } |
8194bf88 | 968 | else { |
20f6aaab | 969 | if (accumulator[seen_dp] > MAX_ACCUMULATE) { |
8194bf88 | 970 | /* add accumulator to result and start again */ |
20f6aaab AS |
971 | result[seen_dp] = S_mulexp10(result[seen_dp], |
972 | exp_acc[seen_dp]) | |
973 | + (NV)accumulator[seen_dp]; | |
974 | accumulator[seen_dp] = 0; | |
975 | exp_acc[seen_dp] = 0; | |
98994639 | 976 | } |
20f6aaab AS |
977 | accumulator[seen_dp] = accumulator[seen_dp] * 10 + digit; |
978 | ++exp_acc[seen_dp]; | |
98994639 | 979 | } |
8194bf88 | 980 | } |
e1ec3a88 | 981 | else if (!seen_dp && GROK_NUMERIC_RADIX(&s, send)) { |
8194bf88 | 982 | seen_dp = 1; |
20f6aaab | 983 | if (sig_digits > MAX_SIG_DIGITS) { |
c86f7df5 | 984 | do { |
20f6aaab | 985 | ++s; |
c86f7df5 | 986 | } while (isDIGIT(*s)); |
20f6aaab AS |
987 | break; |
988 | } | |
8194bf88 DM |
989 | } |
990 | else { | |
991 | break; | |
98994639 HS |
992 | } |
993 | } | |
994 | ||
20f6aaab AS |
995 | result[0] = S_mulexp10(result[0], exp_acc[0]) + (NV)accumulator[0]; |
996 | if (seen_dp) { | |
997 | result[1] = S_mulexp10(result[1], exp_acc[1]) + (NV)accumulator[1]; | |
998 | } | |
98994639 | 999 | |
8194bf88 | 1000 | if (seen_digit && (*s == 'e' || *s == 'E')) { |
98994639 HS |
1001 | bool expnegative = 0; |
1002 | ||
1003 | ++s; | |
1004 | switch (*s) { | |
1005 | case '-': | |
1006 | expnegative = 1; | |
1007 | /* fall through */ | |
1008 | case '+': | |
1009 | ++s; | |
1010 | } | |
1011 | while (isDIGIT(*s)) | |
1012 | exponent = exponent * 10 + (*s++ - '0'); | |
1013 | if (expnegative) | |
1014 | exponent = -exponent; | |
1015 | } | |
1016 | ||
20f6aaab AS |
1017 | |
1018 | ||
98994639 | 1019 | /* now apply the exponent */ |
20f6aaab AS |
1020 | |
1021 | if (seen_dp) { | |
1022 | result[2] = S_mulexp10(result[0],exponent+exp_adjust[0]) | |
1023 | + S_mulexp10(result[1],exponent-exp_adjust[1]); | |
1024 | } else { | |
1025 | result[2] = S_mulexp10(result[0],exponent+exp_adjust[0]); | |
1026 | } | |
98994639 HS |
1027 | |
1028 | /* now apply the sign */ | |
1029 | if (negative) | |
20f6aaab | 1030 | result[2] = -result[2]; |
a36244b7 | 1031 | #endif /* USE_PERL_ATOF */ |
20f6aaab | 1032 | *value = result[2]; |
73d840c0 | 1033 | return (char *)s; |
98994639 HS |
1034 | } |
1035 | ||
55954f19 JH |
1036 | #if ! defined(HAS_MODFL) && defined(HAS_AINTL) && defined(HAS_COPYSIGNL) |
1037 | long double | |
1038 | Perl_my_modfl(long double x, long double *ip) | |
1039 | { | |
1040 | *ip = aintl(x); | |
1041 | return (x == *ip ? copysignl(0.0L, x) : x - *ip); | |
1042 | } | |
1043 | #endif | |
1044 | ||
1045 | #if ! defined(HAS_FREXPL) && defined(HAS_ILOGBL) && defined(HAS_SCALBNL) | |
1046 | long double | |
1047 | Perl_my_frexpl(long double x, int *e) { | |
1048 | *e = x == 0.0L ? 0 : ilogbl(x) + 1; | |
1049 | return (scalbnl(x, -*e)); | |
1050 | } | |
1051 | #endif | |
66610fdd RGS |
1052 | |
1053 | /* | |
ed140128 AD |
1054 | =for apidoc Perl_signbit |
1055 | ||
1056 | Return a non-zero integer if the sign bit on an NV is set, and 0 if | |
1057 | it is not. | |
1058 | ||
1059 | If Configure detects this system has a signbit() that will work with | |
1060 | our NVs, then we just use it via the #define in perl.h. Otherwise, | |
1061 | fall back on this implementation. As a first pass, this gets everything | |
1062 | right except -0.0. Alas, catching -0.0 is the main use for this function, | |
1063 | so this is not too helpful yet. Still, at least we have the scaffolding | |
1064 | in place to support other systems, should that prove useful. | |
1065 | ||
1066 | ||
1067 | Configure notes: This function is called 'Perl_signbit' instead of a | |
1068 | plain 'signbit' because it is easy to imagine a system having a signbit() | |
1069 | function or macro that doesn't happen to work with our particular choice | |
1070 | of NVs. We shouldn't just re-#define signbit as Perl_signbit and expect | |
1071 | the standard system headers to be happy. Also, this is a no-context | |
1072 | function (no pTHX_) because Perl_signbit() is usually re-#defined in | |
1073 | perl.h as a simple macro call to the system's signbit(). | |
1074 | Users should just always call Perl_signbit(). | |
1075 | ||
1076 | =cut | |
1077 | */ | |
1078 | #if !defined(HAS_SIGNBIT) | |
1079 | int | |
1080 | Perl_signbit(NV x) { | |
1081 | return (x < 0.0) ? 1 : 0; | |
1082 | } | |
1083 | #endif | |
1084 | ||
1085 | /* | |
66610fdd RGS |
1086 | * Local variables: |
1087 | * c-indentation-style: bsd | |
1088 | * c-basic-offset: 4 | |
1089 | * indent-tabs-mode: t | |
1090 | * End: | |
1091 | * | |
37442d52 RGS |
1092 | * ex: set ts=8 sts=4 sw=4 noet: |
1093 | */ |