| 1 | /* numeric.c |
| 2 | * |
| 3 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, |
| 4 | * 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others |
| 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 | /* |
| 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"] |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | |
| 20 | This file contains all the stuff needed by perl for manipulating numeric |
| 21 | values, including such things as replacements for the OS's atof() function |
| 22 | |
| 23 | */ |
| 24 | |
| 25 | #include "EXTERN.h" |
| 26 | #define PERL_IN_NUMERIC_C |
| 27 | #include "perl.h" |
| 28 | |
| 29 | #ifdef Perl_strtod |
| 30 | |
| 31 | PERL_STATIC_INLINE NV |
| 32 | S_strtod(pTHX_ const char * const s, char ** e) |
| 33 | { |
| 34 | DECLARATION_FOR_LC_NUMERIC_MANIPULATION; |
| 35 | NV result; |
| 36 | |
| 37 | STORE_LC_NUMERIC_SET_TO_NEEDED(); |
| 38 | |
| 39 | # ifdef USE_QUADMATH |
| 40 | |
| 41 | result = strtoflt128(s, e); |
| 42 | |
| 43 | # elif defined(HAS_STRTOLD) && defined(HAS_LONG_DOUBLE) \ |
| 44 | && defined(USE_LONG_DOUBLE) |
| 45 | # if defined(__MINGW64_VERSION_MAJOR) |
| 46 | /*********************************************** |
| 47 | We are unable to use strtold because of |
| 48 | https://sourceforge.net/p/mingw-w64/bugs/711/ |
| 49 | & |
| 50 | https://sourceforge.net/p/mingw-w64/bugs/725/ |
| 51 | |
| 52 | but __mingw_strtold is fine. |
| 53 | ***********************************************/ |
| 54 | |
| 55 | result = __mingw_strtold(s, e); |
| 56 | |
| 57 | # else |
| 58 | |
| 59 | result = strtold(s, e); |
| 60 | |
| 61 | # endif |
| 62 | # elif defined(HAS_STRTOD) |
| 63 | |
| 64 | result = strtod(s, e); |
| 65 | |
| 66 | # else |
| 67 | # error No strtod() equivalent found |
| 68 | # endif |
| 69 | |
| 70 | RESTORE_LC_NUMERIC(); |
| 71 | |
| 72 | return result; |
| 73 | } |
| 74 | |
| 75 | #endif /* #ifdef Perl_strtod */ |
| 76 | |
| 77 | /* |
| 78 | |
| 79 | =for apidoc my_strtod |
| 80 | |
| 81 | This function is equivalent to the libc strtod() function, and is available |
| 82 | even on platforms that lack plain strtod(). Its return value is the best |
| 83 | available precision depending on platform capabilities and F<Configure> |
| 84 | options. |
| 85 | |
| 86 | It properly handles the locale radix character, meaning it expects a dot except |
| 87 | when called from within the scope of S<C<use locale>>, in which case the radix |
| 88 | character should be that specified by the current locale. |
| 89 | |
| 90 | The synonym Strtod() may be used instead. |
| 91 | |
| 92 | =cut |
| 93 | |
| 94 | */ |
| 95 | |
| 96 | NV |
| 97 | Perl_my_strtod(const char * const s, char **e) |
| 98 | { |
| 99 | dTHX; |
| 100 | |
| 101 | PERL_ARGS_ASSERT_MY_STRTOD; |
| 102 | |
| 103 | #ifdef Perl_strtod |
| 104 | |
| 105 | return S_strtod(aTHX_ s, e); |
| 106 | |
| 107 | #else |
| 108 | |
| 109 | { |
| 110 | NV result; |
| 111 | char * end_ptr; |
| 112 | |
| 113 | end_ptr = my_atof2(s, &result); |
| 114 | if (e) { |
| 115 | *e = end_ptr; |
| 116 | } |
| 117 | |
| 118 | if (! end_ptr) { |
| 119 | result = 0.0; |
| 120 | } |
| 121 | |
| 122 | return result; |
| 123 | } |
| 124 | |
| 125 | #endif |
| 126 | |
| 127 | } |
| 128 | |
| 129 | |
| 130 | U32 |
| 131 | Perl_cast_ulong(NV f) |
| 132 | { |
| 133 | if (f < 0.0) |
| 134 | return f < I32_MIN ? (U32) I32_MIN : (U32)(I32) f; |
| 135 | if (f < U32_MAX_P1) { |
| 136 | #if CASTFLAGS & 2 |
| 137 | if (f < U32_MAX_P1_HALF) |
| 138 | return (U32) f; |
| 139 | f -= U32_MAX_P1_HALF; |
| 140 | return ((U32) f) | (1 + (U32_MAX >> 1)); |
| 141 | #else |
| 142 | return (U32) f; |
| 143 | #endif |
| 144 | } |
| 145 | return f > 0 ? U32_MAX : 0 /* NaN */; |
| 146 | } |
| 147 | |
| 148 | I32 |
| 149 | Perl_cast_i32(NV f) |
| 150 | { |
| 151 | if (f < I32_MAX_P1) |
| 152 | return f < I32_MIN ? I32_MIN : (I32) f; |
| 153 | if (f < U32_MAX_P1) { |
| 154 | #if CASTFLAGS & 2 |
| 155 | if (f < U32_MAX_P1_HALF) |
| 156 | return (I32)(U32) f; |
| 157 | f -= U32_MAX_P1_HALF; |
| 158 | return (I32)(((U32) f) | (1 + (U32_MAX >> 1))); |
| 159 | #else |
| 160 | return (I32)(U32) f; |
| 161 | #endif |
| 162 | } |
| 163 | return f > 0 ? (I32)U32_MAX : 0 /* NaN */; |
| 164 | } |
| 165 | |
| 166 | IV |
| 167 | Perl_cast_iv(NV f) |
| 168 | { |
| 169 | if (f < IV_MAX_P1) |
| 170 | return f < IV_MIN ? IV_MIN : (IV) f; |
| 171 | if (f < UV_MAX_P1) { |
| 172 | #if CASTFLAGS & 2 |
| 173 | /* For future flexibility allowing for sizeof(UV) >= sizeof(IV) */ |
| 174 | if (f < UV_MAX_P1_HALF) |
| 175 | return (IV)(UV) f; |
| 176 | f -= UV_MAX_P1_HALF; |
| 177 | return (IV)(((UV) f) | (1 + (UV_MAX >> 1))); |
| 178 | #else |
| 179 | return (IV)(UV) f; |
| 180 | #endif |
| 181 | } |
| 182 | return f > 0 ? (IV)UV_MAX : 0 /* NaN */; |
| 183 | } |
| 184 | |
| 185 | UV |
| 186 | Perl_cast_uv(NV f) |
| 187 | { |
| 188 | if (f < 0.0) |
| 189 | return f < IV_MIN ? (UV) IV_MIN : (UV)(IV) f; |
| 190 | if (f < UV_MAX_P1) { |
| 191 | #if CASTFLAGS & 2 |
| 192 | if (f < UV_MAX_P1_HALF) |
| 193 | return (UV) f; |
| 194 | f -= UV_MAX_P1_HALF; |
| 195 | return ((UV) f) | (1 + (UV_MAX >> 1)); |
| 196 | #else |
| 197 | return (UV) f; |
| 198 | #endif |
| 199 | } |
| 200 | return f > 0 ? UV_MAX : 0 /* NaN */; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | =for apidoc grok_bin |
| 205 | |
| 206 | converts a string representing a binary number to numeric form. |
| 207 | |
| 208 | On entry C<start> and C<*len_p> give the string to scan, C<*flags> gives |
| 209 | conversion flags, and C<result> should be C<NULL> or a pointer to an NV. The |
| 210 | scan stops at the end of the string, or at just before the first invalid |
| 211 | character. Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in C<*flags>, |
| 212 | encountering an invalid character (except NUL) will also trigger a warning. On |
| 213 | return C<*len_p> is set to the length of the scanned string, and C<*flags> |
| 214 | gives output flags. |
| 215 | |
| 216 | If the value is <= C<UV_MAX> it is returned as a UV, the output flags are clear, |
| 217 | and nothing is written to C<*result>. If the value is > C<UV_MAX>, C<grok_bin> |
| 218 | returns C<UV_MAX>, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags, |
| 219 | and writes an approximation of the correct value into C<*result> (which is an |
| 220 | NV; or the approximation is discarded if C<result> is NULL). |
| 221 | |
| 222 | The binary number may optionally be prefixed with C<"0b"> or C<"b"> unless |
| 223 | C<PERL_SCAN_DISALLOW_PREFIX> is set in C<*flags> on entry. |
| 224 | |
| 225 | If C<PERL_SCAN_ALLOW_UNDERSCORES> is set in C<*flags> then any or all pairs of |
| 226 | digits may be separated from each other by a single underscore; also a single |
| 227 | leading underscore is accepted. |
| 228 | |
| 229 | =for apidoc Amnh||PERL_SCAN_ALLOW_UNDERSCORES |
| 230 | =for apidoc Amnh||PERL_SCAN_DISALLOW_PREFIX |
| 231 | =for apidoc Amnh||PERL_SCAN_GREATER_THAN_UV_MAX |
| 232 | =for apidoc Amnh||PERL_SCAN_SILENT_ILLDIGIT |
| 233 | |
| 234 | =cut |
| 235 | |
| 236 | Not documented yet because experimental is C<PERL_SCAN_SILENT_NON_PORTABLE |
| 237 | which suppresses any message for non-portable numbers that are still valid |
| 238 | on this platform. |
| 239 | */ |
| 240 | |
| 241 | UV |
| 242 | Perl_grok_bin(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) |
| 243 | { |
| 244 | PERL_ARGS_ASSERT_GROK_BIN; |
| 245 | |
| 246 | return grok_bin(start, len_p, flags, result); |
| 247 | } |
| 248 | |
| 249 | /* |
| 250 | =for apidoc grok_hex |
| 251 | |
| 252 | converts a string representing a hex number to numeric form. |
| 253 | |
| 254 | On entry C<start> and C<*len_p> give the string to scan, C<*flags> gives |
| 255 | conversion flags, and C<result> should be C<NULL> or a pointer to an NV. The |
| 256 | scan stops at the end of the string, or at just before the first invalid |
| 257 | character. Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in C<*flags>, |
| 258 | encountering an invalid character (except NUL) will also trigger a warning. On |
| 259 | return C<*len_p> is set to the length of the scanned string, and C<*flags> |
| 260 | gives output flags. |
| 261 | |
| 262 | If the value is <= C<UV_MAX> it is returned as a UV, the output flags are clear, |
| 263 | and nothing is written to C<*result>. If the value is > C<UV_MAX>, C<grok_hex> |
| 264 | returns C<UV_MAX>, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags, |
| 265 | and writes an approximation of the correct value into C<*result> (which is an |
| 266 | NV; or the approximation is discarded if C<result> is NULL). |
| 267 | |
| 268 | The hex number may optionally be prefixed with C<"0x"> or C<"x"> unless |
| 269 | C<PERL_SCAN_DISALLOW_PREFIX> is set in C<*flags> on entry. |
| 270 | |
| 271 | If C<PERL_SCAN_ALLOW_UNDERSCORES> is set in C<*flags> then any or all pairs of |
| 272 | digits may be separated from each other by a single underscore; also a single |
| 273 | leading underscore is accepted. |
| 274 | |
| 275 | =cut |
| 276 | |
| 277 | Not documented yet because experimental is C<PERL_SCAN_SILENT_NON_PORTABLE> |
| 278 | which suppresses any message for non-portable numbers, but which are valid |
| 279 | on this platform. But, C<*flags> will have the corresponding flag bit set. |
| 280 | */ |
| 281 | |
| 282 | UV |
| 283 | Perl_grok_hex(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) |
| 284 | { |
| 285 | PERL_ARGS_ASSERT_GROK_HEX; |
| 286 | |
| 287 | return grok_hex(start, len_p, flags, result); |
| 288 | } |
| 289 | |
| 290 | /* |
| 291 | =for apidoc grok_oct |
| 292 | |
| 293 | converts a string representing an octal number to numeric form. |
| 294 | |
| 295 | On entry C<start> and C<*len_p> give the string to scan, C<*flags> gives |
| 296 | conversion flags, and C<result> should be C<NULL> or a pointer to an NV. The |
| 297 | scan stops at the end of the string, or at just before the first invalid |
| 298 | character. Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in C<*flags>, |
| 299 | encountering an invalid character (except NUL) will also trigger a warning. On |
| 300 | return C<*len_p> is set to the length of the scanned string, and C<*flags> |
| 301 | gives output flags. |
| 302 | |
| 303 | If the value is <= C<UV_MAX> it is returned as a UV, the output flags are clear, |
| 304 | and nothing is written to C<*result>. If the value is > C<UV_MAX>, C<grok_oct> |
| 305 | returns C<UV_MAX>, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags, |
| 306 | and writes an approximation of the correct value into C<*result> (which is an |
| 307 | NV; or the approximation is discarded if C<result> is NULL). |
| 308 | |
| 309 | If C<PERL_SCAN_ALLOW_UNDERSCORES> is set in C<*flags> then any or all pairs of |
| 310 | digits may be separated from each other by a single underscore; also a single |
| 311 | leading underscore is accepted. |
| 312 | |
| 313 | The C<PERL_SCAN_DISALLOW_PREFIX> flag is always treated as being set for |
| 314 | this function. |
| 315 | |
| 316 | =cut |
| 317 | |
| 318 | Not documented yet because experimental is C<PERL_SCAN_SILENT_NON_PORTABLE> |
| 319 | which suppresses any message for non-portable numbers, but which are valid |
| 320 | on this platform. |
| 321 | */ |
| 322 | |
| 323 | UV |
| 324 | Perl_grok_oct(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) |
| 325 | { |
| 326 | PERL_ARGS_ASSERT_GROK_OCT; |
| 327 | |
| 328 | return grok_oct(start, len_p, flags, result); |
| 329 | } |
| 330 | |
| 331 | STATIC void |
| 332 | S_output_non_portable(pTHX_ const U8 base) |
| 333 | { |
| 334 | /* Display the proper message for a number in the given input base not |
| 335 | * fitting in 32 bits */ |
| 336 | const char * which = (base == 2) |
| 337 | ? "Binary number > 0b11111111111111111111111111111111" |
| 338 | : (base == 8) |
| 339 | ? "Octal number > 037777777777" |
| 340 | : "Hexadecimal number > 0xffffffff"; |
| 341 | |
| 342 | PERL_ARGS_ASSERT_OUTPUT_NON_PORTABLE; |
| 343 | |
| 344 | /* Also there are listings for the other two. That's because, since they |
| 345 | * are the first word, it would be hard for a user to find them there |
| 346 | * starting with a %s */ |
| 347 | /* diag_listed_as: Hexadecimal number > 0xffffffff non-portable */ |
| 348 | Perl_ck_warner(aTHX_ packWARN(WARN_PORTABLE), "%s non-portable", which); |
| 349 | } |
| 350 | |
| 351 | UV |
| 352 | Perl_grok_bin_oct_hex(pTHX_ const char *start, |
| 353 | STRLEN *len_p, |
| 354 | I32 *flags, |
| 355 | NV *result, |
| 356 | const unsigned shift, /* 1 for binary; 3 for octal; |
| 357 | 4 for hex */ |
| 358 | const U8 class_bit, |
| 359 | const char prefix |
| 360 | ) |
| 361 | |
| 362 | { |
| 363 | const char *s0 = start; |
| 364 | const char *s; |
| 365 | STRLEN len = *len_p; |
| 366 | STRLEN bytes_so_far; /* How many real digits have been processed */ |
| 367 | UV value = 0; |
| 368 | NV value_nv = 0; |
| 369 | const PERL_UINT_FAST8_T base = 1 << shift; /* 2, 8, or 16 */ |
| 370 | const UV max_div= UV_MAX / base; /* Value above which, the next digit |
| 371 | processed would overflow */ |
| 372 | const I32 input_flags = *flags; |
| 373 | const bool allow_underscores = |
| 374 | cBOOL(input_flags & PERL_SCAN_ALLOW_UNDERSCORES); |
| 375 | bool overflowed = FALSE; |
| 376 | |
| 377 | /* In overflows, this keeps track of how much to multiply the overflowed NV |
| 378 | * by as we continue to parse the remaining digits */ |
| 379 | NV factor = 0; |
| 380 | |
| 381 | /* This function unifies the core of grok_bin, grok_oct, and grok_hex. It |
| 382 | * is optimized for hex conversion. For example, it uses XDIGIT_VALUE to |
| 383 | * find the numeric value of a digit. That requires more instructions than |
| 384 | * OCTAL_VALUE would, but gives the same result for the narrowed range of |
| 385 | * octal digits; same for binary. If it were ever critical to squeeze more |
| 386 | * performance from this, the function could become grok_hex, and a regen |
| 387 | * perl script could scan it and write out two edited copies for the other |
| 388 | * two functions. That would improve the performance of all three |
| 389 | * somewhat. Besides eliminating XDIGIT_VALUE for the other two, extra |
| 390 | * parameters are now passed to this to avoid conditionals. Those could |
| 391 | * become declared consts, like: |
| 392 | * const U8 base = 16; |
| 393 | * const U8 base = 8; |
| 394 | * ... |
| 395 | */ |
| 396 | |
| 397 | PERL_ARGS_ASSERT_GROK_BIN_OCT_HEX; |
| 398 | |
| 399 | ASSUME(inRANGE(shift, 1, 4) && shift != 2); |
| 400 | |
| 401 | /* Clear output flags; unlikely to find a problem that sets them */ |
| 402 | *flags = 0; |
| 403 | |
| 404 | if (!(input_flags & PERL_SCAN_DISALLOW_PREFIX)) { |
| 405 | |
| 406 | /* strip off leading b or 0b; x or 0x. |
| 407 | for compatibility silently suffer "b" and "0b" as valid binary; "x" |
| 408 | and "0x" as valid hex numbers. */ |
| 409 | if (len >= 1) { |
| 410 | if (isALPHA_FOLD_EQ(s0[0], prefix)) { |
| 411 | s0++; |
| 412 | len--; |
| 413 | } |
| 414 | else if (len >= 2 && s0[0] == '0' && (isALPHA_FOLD_EQ(s0[1], prefix))) { |
| 415 | s0+=2; |
| 416 | len-=2; |
| 417 | } |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | s = s0; /* s0 potentially advanced from 'start' */ |
| 422 | |
| 423 | /* Unroll the loop so that the first 8 digits are branchless except for the |
| 424 | * switch. A ninth hex one overflows a 32 bit word. */ |
| 425 | switch (len) { |
| 426 | case 0: |
| 427 | return 0; |
| 428 | default: |
| 429 | if (UNLIKELY(! generic_isCC_(*s, class_bit))) break; |
| 430 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 431 | s++; |
| 432 | /* FALLTHROUGH */ |
| 433 | case 7: |
| 434 | if (UNLIKELY(! generic_isCC_(*s, class_bit))) break; |
| 435 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 436 | s++; |
| 437 | /* FALLTHROUGH */ |
| 438 | case 6: |
| 439 | if (UNLIKELY(! generic_isCC_(*s, class_bit))) break; |
| 440 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 441 | s++; |
| 442 | /* FALLTHROUGH */ |
| 443 | case 5: |
| 444 | if (UNLIKELY(! generic_isCC_(*s, class_bit))) break; |
| 445 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 446 | s++; |
| 447 | /* FALLTHROUGH */ |
| 448 | case 4: |
| 449 | if (UNLIKELY(! generic_isCC_(*s, class_bit))) break; |
| 450 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 451 | s++; |
| 452 | /* FALLTHROUGH */ |
| 453 | case 3: |
| 454 | if (UNLIKELY(! generic_isCC_(*s, class_bit))) break; |
| 455 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 456 | s++; |
| 457 | /* FALLTHROUGH */ |
| 458 | case 2: |
| 459 | if (UNLIKELY(! generic_isCC_(*s, class_bit))) break; |
| 460 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 461 | s++; |
| 462 | /* FALLTHROUGH */ |
| 463 | case 1: |
| 464 | if (UNLIKELY(! generic_isCC_(*s, class_bit))) break; |
| 465 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 466 | |
| 467 | if (LIKELY(len <= 8)) { |
| 468 | return value; |
| 469 | } |
| 470 | |
| 471 | s++; |
| 472 | break; |
| 473 | } |
| 474 | |
| 475 | bytes_so_far = s - s0; |
| 476 | factor = shift << bytes_so_far; |
| 477 | len -= bytes_so_far; |
| 478 | |
| 479 | for (; len--; s++) { |
| 480 | if (generic_isCC_(*s, class_bit)) { |
| 481 | /* Write it in this wonky order with a goto to attempt to get the |
| 482 | compiler to make the common case integer-only loop pretty tight. |
| 483 | With gcc seems to be much straighter code than old scan_hex. |
| 484 | (khw suspects that adding a LIKELY() just above would do the |
| 485 | same thing) */ |
| 486 | redo: |
| 487 | if (LIKELY(value <= max_div)) { |
| 488 | value = (value << shift) | XDIGIT_VALUE(*s); |
| 489 | /* Note XDIGIT_VALUE() is branchless, works on binary |
| 490 | * and octal as well, so can be used here, without |
| 491 | * slowing those down */ |
| 492 | factor *= 1 << shift; |
| 493 | continue; |
| 494 | } |
| 495 | |
| 496 | /* Bah. We are about to overflow. Instead, add the unoverflowed |
| 497 | * value to an NV that contains an approximation to the correct |
| 498 | * value. Each time through the loop we have increased 'factor' so |
| 499 | * that it gives how much the current approximation needs to |
| 500 | * effectively be shifted to make room for this new value */ |
| 501 | value_nv *= factor; |
| 502 | value_nv += (NV) value; |
| 503 | |
| 504 | /* Then we keep accumulating digits, until all are parsed. We |
| 505 | * start over using the current input value. This will be added to |
| 506 | * 'value_nv' eventually, either when all digits are gone, or we |
| 507 | * have overflowed this fresh start. */ |
| 508 | value = XDIGIT_VALUE(*s); |
| 509 | factor = 1 << shift; |
| 510 | |
| 511 | if (! overflowed) { |
| 512 | overflowed = TRUE; |
| 513 | if ( ! (input_flags & PERL_SCAN_SILENT_OVERFLOW) |
| 514 | && ckWARN_d(WARN_OVERFLOW)) |
| 515 | { |
| 516 | Perl_warner(aTHX_ packWARN(WARN_OVERFLOW), |
| 517 | "Integer overflow in %s number", |
| 518 | (base == 16) ? "hexadecimal" |
| 519 | : (base == 2) |
| 520 | ? "binary" |
| 521 | : "octal"); |
| 522 | } |
| 523 | } |
| 524 | continue; |
| 525 | } |
| 526 | |
| 527 | if ( *s == '_' |
| 528 | && len |
| 529 | && allow_underscores |
| 530 | && generic_isCC_(s[1], class_bit) |
| 531 | |
| 532 | /* Don't allow a leading underscore if the only-medial bit is |
| 533 | * set */ |
| 534 | && ( LIKELY(s > s0) |
| 535 | || UNLIKELY((input_flags & PERL_SCAN_ALLOW_MEDIAL_UNDERSCORES) |
| 536 | != PERL_SCAN_ALLOW_MEDIAL_UNDERSCORES))) |
| 537 | { |
| 538 | --len; |
| 539 | ++s; |
| 540 | goto redo; |
| 541 | } |
| 542 | |
| 543 | if (*s) { |
| 544 | if ( ! (input_flags & PERL_SCAN_SILENT_ILLDIGIT) |
| 545 | && ckWARN(WARN_DIGIT)) |
| 546 | { |
| 547 | if (base != 8) { |
| 548 | Perl_warner(aTHX_ packWARN(WARN_DIGIT), |
| 549 | "Illegal %s digit '%c' ignored", |
| 550 | ((base == 2) |
| 551 | ? "binary" |
| 552 | : "hexadecimal"), |
| 553 | *s); |
| 554 | } |
| 555 | else if (isDIGIT(*s)) { /* octal base */ |
| 556 | |
| 557 | /* Allow \octal to work the DWIM way (that is, stop |
| 558 | * scanning as soon as non-octal characters are seen, |
| 559 | * complain only if someone seems to want to use the digits |
| 560 | * eight and nine. Since we know it is not octal, then if |
| 561 | * isDIGIT, must be an 8 or 9). */ |
| 562 | Perl_warner(aTHX_ packWARN(WARN_DIGIT), |
| 563 | "Illegal octal digit '%c' ignored", *s); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | if (input_flags & PERL_SCAN_NOTIFY_ILLDIGIT) { |
| 568 | *flags |= PERL_SCAN_NOTIFY_ILLDIGIT; |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | break; |
| 573 | } |
| 574 | |
| 575 | *len_p = s - start; |
| 576 | |
| 577 | if (LIKELY(! overflowed)) { |
| 578 | #if UVSIZE > 4 |
| 579 | if ( UNLIKELY(value > 0xffffffff) |
| 580 | && ! (input_flags & PERL_SCAN_SILENT_NON_PORTABLE)) |
| 581 | { |
| 582 | output_non_portable(base); |
| 583 | *flags |= PERL_SCAN_SILENT_NON_PORTABLE; |
| 584 | } |
| 585 | #endif |
| 586 | return value; |
| 587 | } |
| 588 | |
| 589 | /* Overflowed: Calculate the final overflow approximation */ |
| 590 | value_nv *= factor; |
| 591 | value_nv += (NV) value; |
| 592 | |
| 593 | output_non_portable(base); |
| 594 | |
| 595 | *flags |= PERL_SCAN_GREATER_THAN_UV_MAX |
| 596 | | PERL_SCAN_SILENT_NON_PORTABLE; |
| 597 | if (result) |
| 598 | *result = value_nv; |
| 599 | return UV_MAX; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | =for apidoc scan_bin |
| 604 | |
| 605 | For backwards compatibility. Use C<grok_bin> instead. |
| 606 | |
| 607 | =for apidoc scan_hex |
| 608 | |
| 609 | For backwards compatibility. Use C<grok_hex> instead. |
| 610 | |
| 611 | =for apidoc scan_oct |
| 612 | |
| 613 | For backwards compatibility. Use C<grok_oct> instead. |
| 614 | |
| 615 | =cut |
| 616 | */ |
| 617 | |
| 618 | NV |
| 619 | Perl_scan_bin(pTHX_ const char *start, STRLEN len, STRLEN *retlen) |
| 620 | { |
| 621 | NV rnv; |
| 622 | I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0; |
| 623 | const UV ruv = grok_bin (start, &len, &flags, &rnv); |
| 624 | |
| 625 | PERL_ARGS_ASSERT_SCAN_BIN; |
| 626 | |
| 627 | *retlen = len; |
| 628 | return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv; |
| 629 | } |
| 630 | |
| 631 | NV |
| 632 | Perl_scan_oct(pTHX_ const char *start, STRLEN len, STRLEN *retlen) |
| 633 | { |
| 634 | NV rnv; |
| 635 | I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0; |
| 636 | const UV ruv = grok_oct (start, &len, &flags, &rnv); |
| 637 | |
| 638 | PERL_ARGS_ASSERT_SCAN_OCT; |
| 639 | |
| 640 | *retlen = len; |
| 641 | return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv; |
| 642 | } |
| 643 | |
| 644 | NV |
| 645 | Perl_scan_hex(pTHX_ const char *start, STRLEN len, STRLEN *retlen) |
| 646 | { |
| 647 | NV rnv; |
| 648 | I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0; |
| 649 | const UV ruv = grok_hex (start, &len, &flags, &rnv); |
| 650 | |
| 651 | PERL_ARGS_ASSERT_SCAN_HEX; |
| 652 | |
| 653 | *retlen = len; |
| 654 | return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv; |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | =for apidoc grok_numeric_radix |
| 659 | |
| 660 | Scan and skip for a numeric decimal separator (radix). |
| 661 | |
| 662 | =cut |
| 663 | */ |
| 664 | bool |
| 665 | Perl_grok_numeric_radix(pTHX_ const char **sp, const char *send) |
| 666 | { |
| 667 | PERL_ARGS_ASSERT_GROK_NUMERIC_RADIX; |
| 668 | |
| 669 | #ifdef USE_LOCALE_NUMERIC |
| 670 | |
| 671 | if (IN_LC(LC_NUMERIC)) { |
| 672 | STRLEN len; |
| 673 | char * radix; |
| 674 | bool matches_radix = FALSE; |
| 675 | DECLARATION_FOR_LC_NUMERIC_MANIPULATION; |
| 676 | |
| 677 | STORE_LC_NUMERIC_FORCE_TO_UNDERLYING(); |
| 678 | |
| 679 | radix = SvPV(PL_numeric_radix_sv, len); |
| 680 | radix = savepvn(radix, len); |
| 681 | |
| 682 | RESTORE_LC_NUMERIC(); |
| 683 | |
| 684 | if (*sp + len <= send) { |
| 685 | matches_radix = memEQ(*sp, radix, len); |
| 686 | } |
| 687 | |
| 688 | Safefree(radix); |
| 689 | |
| 690 | if (matches_radix) { |
| 691 | *sp += len; |
| 692 | return TRUE; |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | #endif |
| 697 | |
| 698 | /* always try "." if numeric radix didn't match because |
| 699 | * we may have data from different locales mixed */ |
| 700 | if (*sp < send && **sp == '.') { |
| 701 | ++*sp; |
| 702 | return TRUE; |
| 703 | } |
| 704 | |
| 705 | return FALSE; |
| 706 | } |
| 707 | |
| 708 | /* |
| 709 | =for apidoc grok_infnan |
| 710 | |
| 711 | Helper for C<grok_number()>, accepts various ways of spelling "infinity" |
| 712 | or "not a number", and returns one of the following flag combinations: |
| 713 | |
| 714 | IS_NUMBER_INFINITY |
| 715 | IS_NUMBER_NAN |
| 716 | IS_NUMBER_INFINITY | IS_NUMBER_NEG |
| 717 | IS_NUMBER_NAN | IS_NUMBER_NEG |
| 718 | 0 |
| 719 | |
| 720 | possibly |-ed with C<IS_NUMBER_TRAILING>. |
| 721 | |
| 722 | If an infinity or a not-a-number is recognized, C<*sp> will point to |
| 723 | one byte past the end of the recognized string. If the recognition fails, |
| 724 | zero is returned, and C<*sp> will not move. |
| 725 | |
| 726 | =for apidoc Amnh|bool|IS_NUMBER_GREATER_THAN_UV_MAX |
| 727 | =for apidoc Amnh|bool|IS_NUMBER_INFINITY |
| 728 | =for apidoc Amnh|bool|IS_NUMBER_IN_UV |
| 729 | =for apidoc Amnh|bool|IS_NUMBER_NAN |
| 730 | =for apidoc Amnh|bool|IS_NUMBER_NEG |
| 731 | =for apidoc Amnh|bool|IS_NUMBER_NOT_INT |
| 732 | |
| 733 | =cut |
| 734 | */ |
| 735 | |
| 736 | int |
| 737 | Perl_grok_infnan(pTHX_ const char** sp, const char* send) |
| 738 | { |
| 739 | const char* s = *sp; |
| 740 | int flags = 0; |
| 741 | #if defined(NV_INF) || defined(NV_NAN) |
| 742 | bool odh = FALSE; /* one-dot-hash: 1.#INF */ |
| 743 | |
| 744 | PERL_ARGS_ASSERT_GROK_INFNAN; |
| 745 | |
| 746 | if (*s == '+') { |
| 747 | s++; if (s == send) return 0; |
| 748 | } |
| 749 | else if (*s == '-') { |
| 750 | flags |= IS_NUMBER_NEG; /* Yes, -NaN happens. Incorrect but happens. */ |
| 751 | s++; if (s == send) return 0; |
| 752 | } |
| 753 | |
| 754 | if (*s == '1') { |
| 755 | /* Visual C: 1.#SNAN, -1.#QNAN, 1#INF, 1.#IND (maybe also 1.#NAN) |
| 756 | * Let's keep the dot optional. */ |
| 757 | s++; if (s == send) return 0; |
| 758 | if (*s == '.') { |
| 759 | s++; if (s == send) return 0; |
| 760 | } |
| 761 | if (*s == '#') { |
| 762 | s++; if (s == send) return 0; |
| 763 | } else |
| 764 | return 0; |
| 765 | odh = TRUE; |
| 766 | } |
| 767 | |
| 768 | if (isALPHA_FOLD_EQ(*s, 'I')) { |
| 769 | /* INF or IND (1.#IND is "indeterminate", a certain type of NAN) */ |
| 770 | |
| 771 | s++; if (s == send || isALPHA_FOLD_NE(*s, 'N')) return 0; |
| 772 | s++; if (s == send) return 0; |
| 773 | if (isALPHA_FOLD_EQ(*s, 'F')) { |
| 774 | flags |= IS_NUMBER_INFINITY | IS_NUMBER_NOT_INT; |
| 775 | *sp = ++s; |
| 776 | if (s < send && (isALPHA_FOLD_EQ(*s, 'I'))) { |
| 777 | int trail = flags | IS_NUMBER_TRAILING; |
| 778 | s++; if (s == send || isALPHA_FOLD_NE(*s, 'N')) return trail; |
| 779 | s++; if (s == send || isALPHA_FOLD_NE(*s, 'I')) return trail; |
| 780 | s++; if (s == send || isALPHA_FOLD_NE(*s, 'T')) return trail; |
| 781 | s++; if (s == send || isALPHA_FOLD_NE(*s, 'Y')) return trail; |
| 782 | *sp = ++s; |
| 783 | } else if (odh) { |
| 784 | while (s < send && *s == '0') { /* 1.#INF00 */ |
| 785 | s++; |
| 786 | } |
| 787 | } |
| 788 | goto ok_check_space; |
| 789 | } |
| 790 | else if (isALPHA_FOLD_EQ(*s, 'D') && odh) { /* 1.#IND */ |
| 791 | s++; |
| 792 | flags |= IS_NUMBER_NAN | IS_NUMBER_NOT_INT; |
| 793 | while (s < send && *s == '0') { /* 1.#IND00 */ |
| 794 | s++; |
| 795 | } |
| 796 | goto ok_check_space; |
| 797 | } else |
| 798 | return 0; |
| 799 | } |
| 800 | else { |
| 801 | /* Maybe NAN of some sort */ |
| 802 | |
| 803 | if (isALPHA_FOLD_EQ(*s, 'S') || isALPHA_FOLD_EQ(*s, 'Q')) { |
| 804 | /* snan, qNaN */ |
| 805 | /* XXX do something with the snan/qnan difference */ |
| 806 | s++; if (s == send) return 0; |
| 807 | } |
| 808 | |
| 809 | if (isALPHA_FOLD_EQ(*s, 'N')) { |
| 810 | s++; if (s == send || isALPHA_FOLD_NE(*s, 'A')) return 0; |
| 811 | s++; if (s == send || isALPHA_FOLD_NE(*s, 'N')) return 0; |
| 812 | flags |= IS_NUMBER_NAN | IS_NUMBER_NOT_INT; |
| 813 | *sp = ++s; |
| 814 | |
| 815 | if (s == send) { |
| 816 | return flags; |
| 817 | } |
| 818 | |
| 819 | /* NaN can be followed by various stuff (NaNQ, NaNS), but |
| 820 | * there are also multiple different NaN values, and some |
| 821 | * implementations output the "payload" values, |
| 822 | * e.g. NaN123, NAN(abc), while some legacy implementations |
| 823 | * have weird stuff like NaN%. */ |
| 824 | if (isALPHA_FOLD_EQ(*s, 'q') || |
| 825 | isALPHA_FOLD_EQ(*s, 's')) { |
| 826 | /* "nanq" or "nans" are ok, though generating |
| 827 | * these portably is tricky. */ |
| 828 | *sp = ++s; |
| 829 | if (s == send) { |
| 830 | return flags; |
| 831 | } |
| 832 | } |
| 833 | if (*s == '(') { |
| 834 | /* C99 style "nan(123)" or Perlish equivalent "nan($uv)". */ |
| 835 | const char *t; |
| 836 | int trail = flags | IS_NUMBER_TRAILING; |
| 837 | s++; |
| 838 | if (s == send) { return trail; } |
| 839 | t = s + 1; |
| 840 | while (t < send && *t && *t != ')') { |
| 841 | t++; |
| 842 | } |
| 843 | if (t == send) { return trail; } |
| 844 | if (*t == ')') { |
| 845 | int nantype; |
| 846 | UV nanval; |
| 847 | if (s[0] == '0' && s + 2 < t && |
| 848 | isALPHA_FOLD_EQ(s[1], 'x') && |
| 849 | isXDIGIT(s[2])) { |
| 850 | STRLEN len = t - s; |
| 851 | I32 flags = PERL_SCAN_ALLOW_UNDERSCORES; |
| 852 | nanval = grok_hex(s, &len, &flags, NULL); |
| 853 | if ((flags & PERL_SCAN_GREATER_THAN_UV_MAX)) { |
| 854 | nantype = 0; |
| 855 | } else { |
| 856 | nantype = IS_NUMBER_IN_UV; |
| 857 | } |
| 858 | s += len; |
| 859 | } else if (s[0] == '0' && s + 2 < t && |
| 860 | isALPHA_FOLD_EQ(s[1], 'b') && |
| 861 | (s[2] == '0' || s[2] == '1')) { |
| 862 | STRLEN len = t - s; |
| 863 | I32 flags = PERL_SCAN_ALLOW_UNDERSCORES; |
| 864 | nanval = grok_bin(s, &len, &flags, NULL); |
| 865 | if ((flags & PERL_SCAN_GREATER_THAN_UV_MAX)) { |
| 866 | nantype = 0; |
| 867 | } else { |
| 868 | nantype = IS_NUMBER_IN_UV; |
| 869 | } |
| 870 | s += len; |
| 871 | } else { |
| 872 | const char *u; |
| 873 | nantype = |
| 874 | grok_number_flags(s, t - s, &nanval, |
| 875 | PERL_SCAN_TRAILING | |
| 876 | PERL_SCAN_ALLOW_UNDERSCORES); |
| 877 | /* Unfortunately grok_number_flags() doesn't |
| 878 | * tell how far we got and the ')' will always |
| 879 | * be "trailing", so we need to double-check |
| 880 | * whether we had something dubious. */ |
| 881 | for (u = s; u < t; u++) { |
| 882 | if (!isDIGIT(*u)) |
| 883 | break; |
| 884 | } |
| 885 | s = u; |
| 886 | } |
| 887 | |
| 888 | /* XXX Doesn't do octal: nan("0123"). |
| 889 | * Probably not a big loss. */ |
| 890 | |
| 891 | /* XXX the nanval is currently unused, that is, |
| 892 | * not inserted as the NaN payload of the NV. |
| 893 | * But the above code already parses the C99 |
| 894 | * nan(...) format. See below, and see also |
| 895 | * the nan() in POSIX.xs. |
| 896 | * |
| 897 | * Certain configuration combinations where |
| 898 | * NVSIZE is greater than UVSIZE mean that |
| 899 | * a single UV cannot contain all the possible |
| 900 | * NaN payload bits. There would need to be |
| 901 | * some more generic syntax than "nan($uv)". |
| 902 | * |
| 903 | * Issues to keep in mind: |
| 904 | * |
| 905 | * (1) In most common cases there would |
| 906 | * not be an integral number of bytes that |
| 907 | * could be set, only a certain number of bits. |
| 908 | * For example for the common case of |
| 909 | * NVSIZE == UVSIZE == 8 there is room for 52 |
| 910 | * bits in the payload, but the most significant |
| 911 | * bit is commonly reserved for the |
| 912 | * signaling/quiet bit, leaving 51 bits. |
| 913 | * Furthermore, the C99 nan() is supposed |
| 914 | * to generate quiet NaNs, so it is doubtful |
| 915 | * whether it should be able to generate |
| 916 | * signaling NaNs. For the x86 80-bit doubles |
| 917 | * (if building a long double Perl) there would |
| 918 | * be 62 bits (s/q bit being the 63rd). |
| 919 | * |
| 920 | * (2) Endianness of the payload bits. If the |
| 921 | * payload is specified as an UV, the low-order |
| 922 | * bits of the UV are naturally little-endianed |
| 923 | * (rightmost) bits of the payload. The endianness |
| 924 | * of UVs and NVs can be different. */ |
| 925 | |
| 926 | if ((nantype & IS_NUMBER_NOT_INT) || |
| 927 | !(nantype && IS_NUMBER_IN_UV)) { |
| 928 | /* treat "NaN(invalid)" the same as "NaNgarbage" */ |
| 929 | return trail; |
| 930 | } |
| 931 | else { |
| 932 | /* allow whitespace between valid payload and ')' */ |
| 933 | while (s < t && isSPACE(*s)) |
| 934 | s++; |
| 935 | /* but on anything else treat the whole '(...)' chunk |
| 936 | * as trailing garbage */ |
| 937 | if (s < t) |
| 938 | return trail; |
| 939 | s = t + 1; |
| 940 | goto ok_check_space; |
| 941 | } |
| 942 | } else { |
| 943 | /* Looked like nan(...), but no close paren. */ |
| 944 | return trail; |
| 945 | } |
| 946 | } else { |
| 947 | /* Note that we here implicitly accept (parse as |
| 948 | * "nan", but with warnings) also any other weird |
| 949 | * trailing stuff for "nan". In the above we just |
| 950 | * check that if we got the C99-style "nan(...)", |
| 951 | * the "..." looks sane. |
| 952 | * If in future we accept more ways of specifying |
| 953 | * the nan payload, the accepting would happen around |
| 954 | * here. */ |
| 955 | goto ok_check_space; |
| 956 | } |
| 957 | } |
| 958 | else |
| 959 | return 0; |
| 960 | } |
| 961 | NOT_REACHED; /* NOTREACHED */ |
| 962 | |
| 963 | /* We parsed something valid, s points after it, flags describes it */ |
| 964 | ok_check_space: |
| 965 | while (s < send && isSPACE(*s)) |
| 966 | s++; |
| 967 | *sp = s; |
| 968 | return flags | (s < send ? IS_NUMBER_TRAILING : 0); |
| 969 | |
| 970 | #else |
| 971 | PERL_UNUSED_ARG(send); |
| 972 | *sp = s; |
| 973 | return flags; |
| 974 | #endif /* #if defined(NV_INF) || defined(NV_NAN) */ |
| 975 | } |
| 976 | |
| 977 | /* |
| 978 | =for apidoc grok_number_flags |
| 979 | |
| 980 | Recognise (or not) a number. The type of the number is returned |
| 981 | (0 if unrecognised), otherwise it is a bit-ORed combination of |
| 982 | C<IS_NUMBER_IN_UV>, C<IS_NUMBER_GREATER_THAN_UV_MAX>, C<IS_NUMBER_NOT_INT>, |
| 983 | C<IS_NUMBER_NEG>, C<IS_NUMBER_INFINITY>, C<IS_NUMBER_NAN> (defined in perl.h). |
| 984 | |
| 985 | If the value of the number can fit in a UV, it is returned in C<*valuep>. |
| 986 | C<IS_NUMBER_IN_UV> will be set to indicate that C<*valuep> is valid, C<IS_NUMBER_IN_UV> |
| 987 | will never be set unless C<*valuep> is valid, but C<*valuep> may have been assigned |
| 988 | to during processing even though C<IS_NUMBER_IN_UV> is not set on return. |
| 989 | If C<valuep> is C<NULL>, C<IS_NUMBER_IN_UV> will be set for the same cases as when |
| 990 | C<valuep> is non-C<NULL>, but no actual assignment (or SEGV) will occur. |
| 991 | |
| 992 | C<IS_NUMBER_NOT_INT> will be set with C<IS_NUMBER_IN_UV> if trailing decimals were |
| 993 | seen (in which case C<*valuep> gives the true value truncated to an integer), and |
| 994 | C<IS_NUMBER_NEG> if the number is negative (in which case C<*valuep> holds the |
| 995 | absolute value). C<IS_NUMBER_IN_UV> is not set if C<e> notation was used or the |
| 996 | number is larger than a UV. |
| 997 | |
| 998 | C<flags> allows only C<PERL_SCAN_TRAILING>, which allows for trailing |
| 999 | non-numeric text on an otherwise successful I<grok>, setting |
| 1000 | C<IS_NUMBER_TRAILING> on the result. |
| 1001 | |
| 1002 | =for apidoc Amnh||PERL_SCAN_TRAILING |
| 1003 | |
| 1004 | =for apidoc grok_number |
| 1005 | |
| 1006 | Identical to C<grok_number_flags()> with C<flags> set to zero. |
| 1007 | |
| 1008 | =cut |
| 1009 | */ |
| 1010 | int |
| 1011 | Perl_grok_number(pTHX_ const char *pv, STRLEN len, UV *valuep) |
| 1012 | { |
| 1013 | PERL_ARGS_ASSERT_GROK_NUMBER; |
| 1014 | |
| 1015 | return grok_number_flags(pv, len, valuep, 0); |
| 1016 | } |
| 1017 | |
| 1018 | static const UV uv_max_div_10 = UV_MAX / 10; |
| 1019 | static const U8 uv_max_mod_10 = UV_MAX % 10; |
| 1020 | |
| 1021 | int |
| 1022 | Perl_grok_number_flags(pTHX_ const char *pv, STRLEN len, UV *valuep, U32 flags) |
| 1023 | { |
| 1024 | const char *s = pv; |
| 1025 | const char * const send = pv + len; |
| 1026 | const char *d; |
| 1027 | int numtype = 0; |
| 1028 | |
| 1029 | PERL_ARGS_ASSERT_GROK_NUMBER_FLAGS; |
| 1030 | |
| 1031 | if (UNLIKELY(isSPACE(*s))) { |
| 1032 | s++; |
| 1033 | while (s < send) { |
| 1034 | if (LIKELY(! isSPACE(*s))) goto non_space; |
| 1035 | s++; |
| 1036 | } |
| 1037 | return 0; |
| 1038 | non_space: ; |
| 1039 | } |
| 1040 | |
| 1041 | /* See if signed. This assumes it is more likely to be unsigned, so |
| 1042 | * penalizes signed by an extra conditional; rewarding unsigned by one fewer |
| 1043 | * (because we detect '+' and '-' with a single test and then add a |
| 1044 | * conditional to determine which) */ |
| 1045 | if (UNLIKELY((*s & ~('+' ^ '-')) == ('+' & '-') )) { |
| 1046 | |
| 1047 | /* Here, on ASCII platforms, *s is one of: 0x29 = ')', 2B = '+', 2D = '-', |
| 1048 | * 2F = '/'. That is, it is either a sign, or a character that doesn't |
| 1049 | * belong in a number at all (unless it's a radix character in a weird |
| 1050 | * locale). Given this, it's far more likely to be a minus than the |
| 1051 | * others. (On EBCDIC it is one of 42, 44, 46, 48, 4A, 4C, 4E, (not 40 |
| 1052 | * because can't be a space) 60, 62, 64, 66, 68, 6A, 6C, 6E. Again, |
| 1053 | * only potentially a weird radix character, or 4E='+', or 60='-') */ |
| 1054 | if (LIKELY(*s == '-')) { |
| 1055 | s++; |
| 1056 | numtype = IS_NUMBER_NEG; |
| 1057 | } |
| 1058 | else if (LIKELY(*s == '+')) |
| 1059 | s++; |
| 1060 | else /* Can't just return failure here, as it could be a weird radix |
| 1061 | character */ |
| 1062 | goto done_sign; |
| 1063 | |
| 1064 | if (UNLIKELY(s == send)) |
| 1065 | return 0; |
| 1066 | done_sign: ; |
| 1067 | } |
| 1068 | |
| 1069 | /* The first digit (after optional sign): note that might |
| 1070 | * also point to "infinity" or "nan", or "1.#INF". */ |
| 1071 | d = s; |
| 1072 | |
| 1073 | /* next must be digit or the radix separator or beginning of infinity/nan */ |
| 1074 | if (LIKELY(isDIGIT(*s))) { |
| 1075 | /* UVs are at least 32 bits, so the first 9 decimal digits cannot |
| 1076 | overflow. */ |
| 1077 | UV value = *s - '0'; /* Process this first (perhaps only) digit */ |
| 1078 | int digit; |
| 1079 | |
| 1080 | s++; |
| 1081 | |
| 1082 | switch(send - s) { |
| 1083 | default: /* 8 or more remaining characters */ |
| 1084 | digit = *s - '0'; |
| 1085 | if (UNLIKELY(! inRANGE(digit, 0, 9))) break; |
| 1086 | value = value * 10 + digit; |
| 1087 | s++; |
| 1088 | /* FALLTHROUGH */ |
| 1089 | case 7: |
| 1090 | digit = *s - '0'; |
| 1091 | if (UNLIKELY(! inRANGE(digit, 0, 9))) break; |
| 1092 | value = value * 10 + digit; |
| 1093 | s++; |
| 1094 | /* FALLTHROUGH */ |
| 1095 | case 6: |
| 1096 | digit = *s - '0'; |
| 1097 | if (UNLIKELY(! inRANGE(digit, 0, 9))) break; |
| 1098 | value = value * 10 + digit; |
| 1099 | s++; |
| 1100 | /* FALLTHROUGH */ |
| 1101 | case 5: |
| 1102 | digit = *s - '0'; |
| 1103 | if (UNLIKELY(! inRANGE(digit, 0, 9))) break; |
| 1104 | value = value * 10 + digit; |
| 1105 | s++; |
| 1106 | /* FALLTHROUGH */ |
| 1107 | case 4: |
| 1108 | digit = *s - '0'; |
| 1109 | if (UNLIKELY(! inRANGE(digit, 0, 9))) break; |
| 1110 | value = value * 10 + digit; |
| 1111 | s++; |
| 1112 | /* FALLTHROUGH */ |
| 1113 | case 3: |
| 1114 | digit = *s - '0'; |
| 1115 | if (UNLIKELY(! inRANGE(digit, 0, 9))) break; |
| 1116 | value = value * 10 + digit; |
| 1117 | s++; |
| 1118 | /* FALLTHROUGH */ |
| 1119 | case 2: |
| 1120 | digit = *s - '0'; |
| 1121 | if (UNLIKELY(! inRANGE(digit, 0, 9))) break; |
| 1122 | value = value * 10 + digit; |
| 1123 | s++; |
| 1124 | /* FALLTHROUGH */ |
| 1125 | case 1: |
| 1126 | digit = *s - '0'; |
| 1127 | if (UNLIKELY(! inRANGE(digit, 0, 9))) break; |
| 1128 | value = value * 10 + digit; |
| 1129 | s++; |
| 1130 | /* FALLTHROUGH */ |
| 1131 | case 0: /* This case means the string consists of just the one |
| 1132 | digit we already have processed */ |
| 1133 | |
| 1134 | /* If we got here by falling through other than the default: case, we |
| 1135 | * have processed the whole string, and know it consists entirely of |
| 1136 | * digits, and can't have overflowed. */ |
| 1137 | if (s >= send) { |
| 1138 | if (valuep) |
| 1139 | *valuep = value; |
| 1140 | return numtype|IS_NUMBER_IN_UV; |
| 1141 | } |
| 1142 | |
| 1143 | /* Here, there are extra characters beyond the first 9 digits. Use a |
| 1144 | * loop to accumulate any remaining digits, until we get a non-digit or |
| 1145 | * would overflow. Note that leading zeros could cause us to get here |
| 1146 | * without being close to overflowing. |
| 1147 | * |
| 1148 | * (The conditional 's >= send' above could be eliminated by making the |
| 1149 | * default: in the switch to instead be 'case 8:', and process longer |
| 1150 | * strings separately by using the loop below. This would penalize |
| 1151 | * these inputs by the extra instructions needed for looping. That |
| 1152 | * could be eliminated by copying the unwound code from above to handle |
| 1153 | * the firt 9 digits of these. khw didn't think this saving of a |
| 1154 | * single conditional was worth it.) */ |
| 1155 | do { |
| 1156 | digit = *s - '0'; |
| 1157 | if (! inRANGE(digit, 0, 9)) goto mantissa_done; |
| 1158 | if ( value < uv_max_div_10 |
| 1159 | || ( value == uv_max_div_10 |
| 1160 | && digit <= uv_max_mod_10)) |
| 1161 | { |
| 1162 | value = value * 10 + digit; |
| 1163 | s++; |
| 1164 | } |
| 1165 | else { /* value would overflow. skip the remaining digits, don't |
| 1166 | worry about setting *valuep. */ |
| 1167 | do { |
| 1168 | s++; |
| 1169 | } while (s < send && isDIGIT(*s)); |
| 1170 | numtype |= |
| 1171 | IS_NUMBER_GREATER_THAN_UV_MAX; |
| 1172 | goto skip_value; |
| 1173 | } |
| 1174 | } while (s < send); |
| 1175 | } /* End switch on input length */ |
| 1176 | |
| 1177 | mantissa_done: |
| 1178 | numtype |= IS_NUMBER_IN_UV; |
| 1179 | if (valuep) |
| 1180 | *valuep = value; |
| 1181 | |
| 1182 | skip_value: |
| 1183 | if (GROK_NUMERIC_RADIX(&s, send)) { |
| 1184 | numtype |= IS_NUMBER_NOT_INT; |
| 1185 | while (s < send && isDIGIT(*s)) /* optional digits after the radix */ |
| 1186 | s++; |
| 1187 | } |
| 1188 | } /* End of *s is a digit */ |
| 1189 | else if (GROK_NUMERIC_RADIX(&s, send)) { |
| 1190 | numtype |= IS_NUMBER_NOT_INT | IS_NUMBER_IN_UV; /* valuep assigned below */ |
| 1191 | /* no digits before the radix means we need digits after it */ |
| 1192 | if (s < send && isDIGIT(*s)) { |
| 1193 | do { |
| 1194 | s++; |
| 1195 | } while (s < send && isDIGIT(*s)); |
| 1196 | if (valuep) { |
| 1197 | /* integer approximation is valid - it's 0. */ |
| 1198 | *valuep = 0; |
| 1199 | } |
| 1200 | } |
| 1201 | else |
| 1202 | return 0; |
| 1203 | } |
| 1204 | |
| 1205 | if (LIKELY(s > d) && s < send) { |
| 1206 | /* we can have an optional exponent part */ |
| 1207 | if (UNLIKELY(isALPHA_FOLD_EQ(*s, 'e'))) { |
| 1208 | s++; |
| 1209 | if (s < send && (*s == '-' || *s == '+')) |
| 1210 | s++; |
| 1211 | if (s < send && isDIGIT(*s)) { |
| 1212 | do { |
| 1213 | s++; |
| 1214 | } while (s < send && isDIGIT(*s)); |
| 1215 | } |
| 1216 | else if (flags & PERL_SCAN_TRAILING) |
| 1217 | return numtype | IS_NUMBER_TRAILING; |
| 1218 | else |
| 1219 | return 0; |
| 1220 | |
| 1221 | /* The only flag we keep is sign. Blow away any "it's UV" */ |
| 1222 | numtype &= IS_NUMBER_NEG; |
| 1223 | numtype |= IS_NUMBER_NOT_INT; |
| 1224 | } |
| 1225 | } |
| 1226 | |
| 1227 | while (s < send) { |
| 1228 | if (LIKELY(! isSPACE(*s))) goto end_space; |
| 1229 | s++; |
| 1230 | } |
| 1231 | return numtype; |
| 1232 | |
| 1233 | end_space: |
| 1234 | |
| 1235 | if (UNLIKELY(memEQs(pv, len, "0 but true"))) { |
| 1236 | if (valuep) |
| 1237 | *valuep = 0; |
| 1238 | return IS_NUMBER_IN_UV; |
| 1239 | } |
| 1240 | |
| 1241 | /* We could be e.g. at "Inf" or "NaN", or at the "#" of "1.#INF". */ |
| 1242 | if ((s + 2 < send) && UNLIKELY(memCHRs("inqs#", toFOLD(*s)))) { |
| 1243 | /* Really detect inf/nan. Start at d, not s, since the above |
| 1244 | * code might have already consumed the "1." or "1". */ |
| 1245 | const int infnan = Perl_grok_infnan(aTHX_ &d, send); |
| 1246 | |
| 1247 | if ((infnan & IS_NUMBER_TRAILING) && !(flags & PERL_SCAN_TRAILING)) { |
| 1248 | return 0; |
| 1249 | } |
| 1250 | if ((infnan & IS_NUMBER_INFINITY)) { |
| 1251 | return (numtype | infnan); /* Keep sign for infinity. */ |
| 1252 | } |
| 1253 | else if ((infnan & IS_NUMBER_NAN)) { |
| 1254 | return (numtype | infnan) & ~IS_NUMBER_NEG; /* Clear sign for nan. */ |
| 1255 | } |
| 1256 | } |
| 1257 | else if (flags & PERL_SCAN_TRAILING) { |
| 1258 | return numtype | IS_NUMBER_TRAILING; |
| 1259 | } |
| 1260 | |
| 1261 | return 0; |
| 1262 | } |
| 1263 | |
| 1264 | /* |
| 1265 | =for apidoc grok_atoUV |
| 1266 | |
| 1267 | parse a string, looking for a decimal unsigned integer. |
| 1268 | |
| 1269 | On entry, C<pv> points to the beginning of the string; |
| 1270 | C<valptr> points to a UV that will receive the converted value, if found; |
| 1271 | C<endptr> is either NULL or points to a variable that points to one byte |
| 1272 | beyond the point in C<pv> that this routine should examine. |
| 1273 | If C<endptr> is NULL, C<pv> is assumed to be NUL-terminated. |
| 1274 | |
| 1275 | Returns FALSE if C<pv> doesn't represent a valid unsigned integer value (with |
| 1276 | no leading zeros). Otherwise it returns TRUE, and sets C<*valptr> to that |
| 1277 | value. |
| 1278 | |
| 1279 | If you constrain the portion of C<pv> that is looked at by this function (by |
| 1280 | passing a non-NULL C<endptr>), and if the intial bytes of that portion form a |
| 1281 | valid value, it will return TRUE, setting C<*endptr> to the byte following the |
| 1282 | final digit of the value. But if there is no constraint at what's looked at, |
| 1283 | all of C<pv> must be valid in order for TRUE to be returned. C<*endptr> is |
| 1284 | unchanged from its value on input if FALSE is returned; |
| 1285 | |
| 1286 | The only characters this accepts are the decimal digits '0'..'9'. |
| 1287 | |
| 1288 | As opposed to L<atoi(3)> or L<strtol(3)>, C<grok_atoUV> does NOT allow optional |
| 1289 | leading whitespace, nor negative inputs. If such features are required, the |
| 1290 | calling code needs to explicitly implement those. |
| 1291 | |
| 1292 | Note that this function returns FALSE for inputs that would overflow a UV, |
| 1293 | or have leading zeros. Thus a single C<0> is accepted, but not C<00> nor |
| 1294 | C<01>, C<002>, I<etc>. |
| 1295 | |
| 1296 | Background: C<atoi> has severe problems with illegal inputs, it cannot be |
| 1297 | used for incremental parsing, and therefore should be avoided |
| 1298 | C<atoi> and C<strtol> are also affected by locale settings, which can also be |
| 1299 | seen as a bug (global state controlled by user environment). |
| 1300 | |
| 1301 | =cut |
| 1302 | |
| 1303 | */ |
| 1304 | |
| 1305 | bool |
| 1306 | Perl_grok_atoUV(const char *pv, UV *valptr, const char** endptr) |
| 1307 | { |
| 1308 | const char* s = pv; |
| 1309 | const char** eptr; |
| 1310 | const char* end2; /* Used in case endptr is NULL. */ |
| 1311 | UV val = 0; /* The parsed value. */ |
| 1312 | |
| 1313 | PERL_ARGS_ASSERT_GROK_ATOUV; |
| 1314 | |
| 1315 | if (endptr) { |
| 1316 | eptr = endptr; |
| 1317 | } |
| 1318 | else { |
| 1319 | end2 = s + strlen(s); |
| 1320 | eptr = &end2; |
| 1321 | } |
| 1322 | |
| 1323 | if ( *eptr <= s |
| 1324 | || ! isDIGIT(*s)) |
| 1325 | { |
| 1326 | return FALSE; |
| 1327 | } |
| 1328 | |
| 1329 | /* Single-digit inputs are quite common. */ |
| 1330 | val = *s++ - '0'; |
| 1331 | if (s < *eptr && isDIGIT(*s)) { |
| 1332 | /* Fail on extra leading zeros. */ |
| 1333 | if (val == 0) |
| 1334 | return FALSE; |
| 1335 | while (s < *eptr && isDIGIT(*s)) { |
| 1336 | /* This could be unrolled like in grok_number(), but |
| 1337 | * the expected uses of this are not speed-needy, and |
| 1338 | * unlikely to need full 64-bitness. */ |
| 1339 | const U8 digit = *s++ - '0'; |
| 1340 | if (val < uv_max_div_10 || |
| 1341 | (val == uv_max_div_10 && digit <= uv_max_mod_10)) { |
| 1342 | val = val * 10 + digit; |
| 1343 | } else { |
| 1344 | return FALSE; |
| 1345 | } |
| 1346 | } |
| 1347 | } |
| 1348 | |
| 1349 | if (endptr == NULL) { |
| 1350 | if (*s) { |
| 1351 | return FALSE; /* If endptr is NULL, no trailing non-digits allowed. */ |
| 1352 | } |
| 1353 | } |
| 1354 | else { |
| 1355 | *endptr = s; |
| 1356 | } |
| 1357 | |
| 1358 | *valptr = val; |
| 1359 | return TRUE; |
| 1360 | } |
| 1361 | |
| 1362 | #ifndef Perl_strtod |
| 1363 | STATIC NV |
| 1364 | S_mulexp10(NV value, I32 exponent) |
| 1365 | { |
| 1366 | NV result = 1.0; |
| 1367 | NV power = 10.0; |
| 1368 | bool negative = 0; |
| 1369 | I32 bit; |
| 1370 | |
| 1371 | if (exponent == 0) |
| 1372 | return value; |
| 1373 | if (value == 0) |
| 1374 | return (NV)0; |
| 1375 | |
| 1376 | /* On OpenVMS VAX we by default use the D_FLOAT double format, |
| 1377 | * and that format does not have *easy* capabilities [1] for |
| 1378 | * overflowing doubles 'silently' as IEEE fp does. We also need |
| 1379 | * to support G_FLOAT on both VAX and Alpha, and though the exponent |
| 1380 | * range is much larger than D_FLOAT it still doesn't do silent |
| 1381 | * overflow. Therefore we need to detect early whether we would |
| 1382 | * overflow (this is the behaviour of the native string-to-float |
| 1383 | * conversion routines, and therefore of native applications, too). |
| 1384 | * |
| 1385 | * [1] Trying to establish a condition handler to trap floating point |
| 1386 | * exceptions is not a good idea. */ |
| 1387 | |
| 1388 | /* In UNICOS and in certain Cray models (such as T90) there is no |
| 1389 | * IEEE fp, and no way at all from C to catch fp overflows gracefully. |
| 1390 | * There is something you can do if you are willing to use some |
| 1391 | * inline assembler: the instruction is called DFI-- but that will |
| 1392 | * disable *all* floating point interrupts, a little bit too large |
| 1393 | * a hammer. Therefore we need to catch potential overflows before |
| 1394 | * it's too late. */ |
| 1395 | |
| 1396 | #if ((defined(VMS) && !defined(_IEEE_FP)) || defined(_UNICOS) || defined(DOUBLE_IS_VAX_FLOAT)) && defined(NV_MAX_10_EXP) |
| 1397 | STMT_START { |
| 1398 | const NV exp_v = log10(value); |
| 1399 | if (exponent >= NV_MAX_10_EXP || exponent + exp_v >= NV_MAX_10_EXP) |
| 1400 | return NV_MAX; |
| 1401 | if (exponent < 0) { |
| 1402 | if (-(exponent + exp_v) >= NV_MAX_10_EXP) |
| 1403 | return 0.0; |
| 1404 | while (-exponent >= NV_MAX_10_EXP) { |
| 1405 | /* combination does not overflow, but 10^(-exponent) does */ |
| 1406 | value /= 10; |
| 1407 | ++exponent; |
| 1408 | } |
| 1409 | } |
| 1410 | } STMT_END; |
| 1411 | #endif |
| 1412 | |
| 1413 | if (exponent < 0) { |
| 1414 | negative = 1; |
| 1415 | exponent = -exponent; |
| 1416 | #ifdef NV_MAX_10_EXP |
| 1417 | /* for something like 1234 x 10^-309, the action of calculating |
| 1418 | * the intermediate value 10^309 then returning 1234 / (10^309) |
| 1419 | * will fail, since 10^309 becomes infinity. In this case try to |
| 1420 | * refactor it as 123 / (10^308) etc. |
| 1421 | */ |
| 1422 | while (value && exponent > NV_MAX_10_EXP) { |
| 1423 | exponent--; |
| 1424 | value /= 10; |
| 1425 | } |
| 1426 | if (value == 0.0) |
| 1427 | return value; |
| 1428 | #endif |
| 1429 | } |
| 1430 | #if defined(__osf__) |
| 1431 | /* Even with cc -ieee + ieee_set_fp_control(IEEE_TRAP_ENABLE_INV) |
| 1432 | * Tru64 fp behavior on inf/nan is somewhat broken. Another way |
| 1433 | * to do this would be ieee_set_fp_control(IEEE_TRAP_ENABLE_OVF) |
| 1434 | * but that breaks another set of infnan.t tests. */ |
| 1435 | # define FP_OVERFLOWS_TO_ZERO |
| 1436 | #endif |
| 1437 | for (bit = 1; exponent; bit <<= 1) { |
| 1438 | if (exponent & bit) { |
| 1439 | exponent ^= bit; |
| 1440 | result *= power; |
| 1441 | #ifdef FP_OVERFLOWS_TO_ZERO |
| 1442 | if (result == 0) |
| 1443 | # ifdef NV_INF |
| 1444 | return value < 0 ? -NV_INF : NV_INF; |
| 1445 | # else |
| 1446 | return value < 0 ? -FLT_MAX : FLT_MAX; |
| 1447 | # endif |
| 1448 | #endif |
| 1449 | /* Floating point exceptions are supposed to be turned off, |
| 1450 | * but if we're obviously done, don't risk another iteration. |
| 1451 | */ |
| 1452 | if (exponent == 0) break; |
| 1453 | } |
| 1454 | power *= power; |
| 1455 | } |
| 1456 | return negative ? value / result : value * result; |
| 1457 | } |
| 1458 | #endif /* #ifndef Perl_strtod */ |
| 1459 | |
| 1460 | #ifdef Perl_strtod |
| 1461 | # define ATOF(s, x) my_atof2(s, &x) |
| 1462 | #else |
| 1463 | # define ATOF(s, x) Perl_atof2(s, x) |
| 1464 | #endif |
| 1465 | |
| 1466 | NV |
| 1467 | Perl_my_atof(pTHX_ const char* s) |
| 1468 | { |
| 1469 | |
| 1470 | /* |
| 1471 | =for apidoc my_atof |
| 1472 | |
| 1473 | L<C<atof>(3)>, but properly works with Perl locale handling, accepting a dot |
| 1474 | radix character always, but also the current locale's radix character if and |
| 1475 | only if called from within the lexical scope of a Perl C<use locale> statement. |
| 1476 | |
| 1477 | N.B. C<s> must be NUL terminated. |
| 1478 | |
| 1479 | =cut |
| 1480 | */ |
| 1481 | |
| 1482 | NV x = 0.0; |
| 1483 | |
| 1484 | PERL_ARGS_ASSERT_MY_ATOF; |
| 1485 | |
| 1486 | #if ! defined(USE_LOCALE_NUMERIC) |
| 1487 | |
| 1488 | ATOF(s, x); |
| 1489 | |
| 1490 | #else |
| 1491 | |
| 1492 | { |
| 1493 | DECLARATION_FOR_LC_NUMERIC_MANIPULATION; |
| 1494 | STORE_LC_NUMERIC_SET_TO_NEEDED(); |
| 1495 | if (! (PL_numeric_radix_sv && IN_LC(LC_NUMERIC))) { |
| 1496 | ATOF(s,x); |
| 1497 | } |
| 1498 | else { |
| 1499 | |
| 1500 | /* Look through the string for the first thing that looks like a |
| 1501 | * decimal point: either the value in the current locale or the |
| 1502 | * standard fallback of '.'. The one which appears earliest in the |
| 1503 | * input string is the one that we should have atof look for. Note |
| 1504 | * that we have to determine this beforehand because on some |
| 1505 | * systems, Perl_atof2 is just a wrapper around the system's atof. |
| 1506 | * */ |
| 1507 | const char * const standard_pos = strchr(s, '.'); |
| 1508 | const char * const local_pos |
| 1509 | = strstr(s, SvPV_nolen(PL_numeric_radix_sv)); |
| 1510 | const bool use_standard_radix |
| 1511 | = standard_pos && (!local_pos || standard_pos < local_pos); |
| 1512 | |
| 1513 | if (use_standard_radix) { |
| 1514 | SET_NUMERIC_STANDARD(); |
| 1515 | LOCK_LC_NUMERIC_STANDARD(); |
| 1516 | } |
| 1517 | |
| 1518 | ATOF(s,x); |
| 1519 | |
| 1520 | if (use_standard_radix) { |
| 1521 | UNLOCK_LC_NUMERIC_STANDARD(); |
| 1522 | SET_NUMERIC_UNDERLYING(); |
| 1523 | } |
| 1524 | } |
| 1525 | RESTORE_LC_NUMERIC(); |
| 1526 | } |
| 1527 | |
| 1528 | #endif |
| 1529 | |
| 1530 | return x; |
| 1531 | } |
| 1532 | |
| 1533 | #if defined(NV_INF) || defined(NV_NAN) |
| 1534 | |
| 1535 | static char* |
| 1536 | S_my_atof_infnan(pTHX_ const char* s, bool negative, const char* send, NV* value) |
| 1537 | { |
| 1538 | const char *p0 = negative ? s - 1 : s; |
| 1539 | const char *p = p0; |
| 1540 | const int infnan = grok_infnan(&p, send); |
| 1541 | /* We act like PERL_SCAN_TRAILING here to permit trailing garbage, |
| 1542 | * it is not clear if that is desirable. |
| 1543 | */ |
| 1544 | if (infnan && p != p0) { |
| 1545 | /* If we can generate inf/nan directly, let's do so. */ |
| 1546 | #ifdef NV_INF |
| 1547 | if ((infnan & IS_NUMBER_INFINITY)) { |
| 1548 | *value = (infnan & IS_NUMBER_NEG) ? -NV_INF: NV_INF; |
| 1549 | return (char*)p; |
| 1550 | } |
| 1551 | #endif |
| 1552 | #ifdef NV_NAN |
| 1553 | if ((infnan & IS_NUMBER_NAN)) { |
| 1554 | *value = NV_NAN; |
| 1555 | return (char*)p; |
| 1556 | } |
| 1557 | #endif |
| 1558 | #ifdef Perl_strtod |
| 1559 | /* If still here, we didn't have either NV_INF or NV_NAN, |
| 1560 | * and can try falling back to native strtod/strtold. |
| 1561 | * |
| 1562 | * The native interface might not recognize all the possible |
| 1563 | * inf/nan strings Perl recognizes. What we can try |
| 1564 | * is to try faking the input. We will try inf/-inf/nan |
| 1565 | * as the most promising/portable input. */ |
| 1566 | { |
| 1567 | const char* fake = "silence compiler warning"; |
| 1568 | char* endp; |
| 1569 | NV nv; |
| 1570 | #ifdef NV_INF |
| 1571 | if ((infnan & IS_NUMBER_INFINITY)) { |
| 1572 | fake = ((infnan & IS_NUMBER_NEG)) ? "-inf" : "inf"; |
| 1573 | } |
| 1574 | #endif |
| 1575 | #ifdef NV_NAN |
| 1576 | if ((infnan & IS_NUMBER_NAN)) { |
| 1577 | fake = "nan"; |
| 1578 | } |
| 1579 | #endif |
| 1580 | assert(strNE(fake, "silence compiler warning")); |
| 1581 | nv = S_strtod(aTHX_ fake, &endp); |
| 1582 | if (fake != endp) { |
| 1583 | #ifdef NV_INF |
| 1584 | if ((infnan & IS_NUMBER_INFINITY)) { |
| 1585 | # ifdef Perl_isinf |
| 1586 | if (Perl_isinf(nv)) |
| 1587 | *value = nv; |
| 1588 | # else |
| 1589 | /* last resort, may generate SIGFPE */ |
| 1590 | *value = Perl_exp((NV)1e9); |
| 1591 | if ((infnan & IS_NUMBER_NEG)) |
| 1592 | *value = -*value; |
| 1593 | # endif |
| 1594 | return (char*)p; /* p, not endp */ |
| 1595 | } |
| 1596 | #endif |
| 1597 | #ifdef NV_NAN |
| 1598 | if ((infnan & IS_NUMBER_NAN)) { |
| 1599 | # ifdef Perl_isnan |
| 1600 | if (Perl_isnan(nv)) |
| 1601 | *value = nv; |
| 1602 | # else |
| 1603 | /* last resort, may generate SIGFPE */ |
| 1604 | *value = Perl_log((NV)-1.0); |
| 1605 | # endif |
| 1606 | return (char*)p; /* p, not endp */ |
| 1607 | #endif |
| 1608 | } |
| 1609 | } |
| 1610 | } |
| 1611 | #endif /* #ifdef Perl_strtod */ |
| 1612 | } |
| 1613 | return NULL; |
| 1614 | } |
| 1615 | |
| 1616 | #endif /* if defined(NV_INF) || defined(NV_NAN) */ |
| 1617 | |
| 1618 | char* |
| 1619 | Perl_my_atof2(pTHX_ const char* orig, NV* value) |
| 1620 | { |
| 1621 | PERL_ARGS_ASSERT_MY_ATOF2; |
| 1622 | return my_atof3(orig, value, 0); |
| 1623 | } |
| 1624 | |
| 1625 | char* |
| 1626 | Perl_my_atof3(pTHX_ const char* orig, NV* value, const STRLEN len) |
| 1627 | { |
| 1628 | const char* s = orig; |
| 1629 | NV result[3] = {0.0, 0.0, 0.0}; |
| 1630 | #if defined(USE_PERL_ATOF) || defined(Perl_strtod) |
| 1631 | const char* send = s + ((len != 0) |
| 1632 | ? len |
| 1633 | : strlen(orig)); /* one past the last */ |
| 1634 | #endif |
| 1635 | #if defined(USE_PERL_ATOF) && !defined(Perl_strtod) |
| 1636 | bool negative = 0; |
| 1637 | UV accumulator[2] = {0,0}; /* before/after dp */ |
| 1638 | bool seen_digit = 0; |
| 1639 | I32 exp_adjust[2] = {0,0}; |
| 1640 | I32 exp_acc[2] = {-1, -1}; |
| 1641 | /* the current exponent adjust for the accumulators */ |
| 1642 | I32 exponent = 0; |
| 1643 | I32 seen_dp = 0; |
| 1644 | I32 digit = 0; |
| 1645 | I32 old_digit = 0; |
| 1646 | I32 sig_digits = 0; /* noof significant digits seen so far */ |
| 1647 | #endif |
| 1648 | |
| 1649 | #if defined(USE_PERL_ATOF) || defined(Perl_strtod) |
| 1650 | PERL_ARGS_ASSERT_MY_ATOF3; |
| 1651 | |
| 1652 | /* leading whitespace */ |
| 1653 | while (s < send && isSPACE(*s)) |
| 1654 | ++s; |
| 1655 | |
| 1656 | # if defined(NV_INF) || defined(NV_NAN) |
| 1657 | { |
| 1658 | char* endp; |
| 1659 | if ((endp = S_my_atof_infnan(aTHX_ s, FALSE, send, value))) |
| 1660 | return endp; |
| 1661 | } |
| 1662 | # endif |
| 1663 | |
| 1664 | /* sign */ |
| 1665 | switch (*s) { |
| 1666 | case '-': |
| 1667 | # if !defined(Perl_strtod) |
| 1668 | negative = 1; |
| 1669 | # endif |
| 1670 | /* FALLTHROUGH */ |
| 1671 | case '+': |
| 1672 | ++s; |
| 1673 | } |
| 1674 | #endif |
| 1675 | |
| 1676 | #ifdef Perl_strtod |
| 1677 | { |
| 1678 | char* endp; |
| 1679 | char* copy = NULL; |
| 1680 | |
| 1681 | /* strtold() accepts 0x-prefixed hex and in POSIX implementations, |
| 1682 | 0b-prefixed binary numbers, which is backward incompatible |
| 1683 | */ |
| 1684 | if ((len == 0 || len - (s-orig) >= 2) && *s == '0' && |
| 1685 | (isALPHA_FOLD_EQ(s[1], 'x') || isALPHA_FOLD_EQ(s[1], 'b'))) { |
| 1686 | *value = 0; |
| 1687 | return (char *)s+1; |
| 1688 | } |
| 1689 | |
| 1690 | /* We do not want strtod to parse whitespace after the sign, since |
| 1691 | * that would give backward-incompatible results. So we rewind and |
| 1692 | * let strtod handle the whitespace and sign character itself. */ |
| 1693 | s = orig; |
| 1694 | |
| 1695 | /* If the length is passed in, the input string isn't NUL-terminated, |
| 1696 | * and in it turns out the function below assumes it is; therefore we |
| 1697 | * create a copy and NUL-terminate that */ |
| 1698 | if (len) { |
| 1699 | Newx(copy, len + 1, char); |
| 1700 | Copy(orig, copy, len, char); |
| 1701 | copy[len] = '\0'; |
| 1702 | s = copy; |
| 1703 | } |
| 1704 | |
| 1705 | result[2] = S_strtod(aTHX_ s, &endp); |
| 1706 | |
| 1707 | /* If we created a copy, 'endp' is in terms of that. Convert back to |
| 1708 | * the original */ |
| 1709 | if (copy) { |
| 1710 | s = (s - copy) + (char *) orig; |
| 1711 | endp = (endp - copy) + (char *) orig; |
| 1712 | Safefree(copy); |
| 1713 | } |
| 1714 | |
| 1715 | if (s != endp) { |
| 1716 | /* Note that negation is handled by strtod. */ |
| 1717 | *value = result[2]; |
| 1718 | return endp; |
| 1719 | } |
| 1720 | return NULL; |
| 1721 | } |
| 1722 | #elif defined(USE_PERL_ATOF) |
| 1723 | |
| 1724 | /* There is no point in processing more significant digits |
| 1725 | * than the NV can hold. Note that NV_DIG is a lower-bound value, |
| 1726 | * while we need an upper-bound value. We add 2 to account for this; |
| 1727 | * since it will have been conservative on both the first and last digit. |
| 1728 | * For example a 32-bit mantissa with an exponent of 4 would have |
| 1729 | * exact values in the set |
| 1730 | * 4 |
| 1731 | * 8 |
| 1732 | * .. |
| 1733 | * 17179869172 |
| 1734 | * 17179869176 |
| 1735 | * 17179869180 |
| 1736 | * |
| 1737 | * where for the purposes of calculating NV_DIG we would have to discount |
| 1738 | * both the first and last digit, since neither can hold all values from |
| 1739 | * 0..9; but for calculating the value we must examine those two digits. |
| 1740 | */ |
| 1741 | # ifdef MAX_SIG_DIG_PLUS |
| 1742 | /* It is not necessarily the case that adding 2 to NV_DIG gets all the |
| 1743 | possible digits in a NV, especially if NVs are not IEEE compliant |
| 1744 | (e.g., long doubles on IRIX) - Allen <allens@cpan.org> */ |
| 1745 | # define MAX_SIG_DIGITS (NV_DIG+MAX_SIG_DIG_PLUS) |
| 1746 | # else |
| 1747 | # define MAX_SIG_DIGITS (NV_DIG+2) |
| 1748 | # endif |
| 1749 | |
| 1750 | /* the max number we can accumulate in a UV, and still safely do 10*N+9 */ |
| 1751 | # define MAX_ACCUMULATE ( (UV) ((UV_MAX - 9)/10)) |
| 1752 | |
| 1753 | /* we accumulate digits into an integer; when this becomes too |
| 1754 | * large, we add the total to NV and start again */ |
| 1755 | |
| 1756 | while (s < send) { |
| 1757 | if (isDIGIT(*s)) { |
| 1758 | seen_digit = 1; |
| 1759 | old_digit = digit; |
| 1760 | digit = *s++ - '0'; |
| 1761 | if (seen_dp) |
| 1762 | exp_adjust[1]++; |
| 1763 | |
| 1764 | /* don't start counting until we see the first significant |
| 1765 | * digit, eg the 5 in 0.00005... */ |
| 1766 | if (!sig_digits && digit == 0) |
| 1767 | continue; |
| 1768 | |
| 1769 | if (++sig_digits > MAX_SIG_DIGITS) { |
| 1770 | /* limits of precision reached */ |
| 1771 | if (digit > 5) { |
| 1772 | ++accumulator[seen_dp]; |
| 1773 | } else if (digit == 5) { |
| 1774 | if (old_digit % 2) { /* round to even - Allen */ |
| 1775 | ++accumulator[seen_dp]; |
| 1776 | } |
| 1777 | } |
| 1778 | if (seen_dp) { |
| 1779 | exp_adjust[1]--; |
| 1780 | } else { |
| 1781 | exp_adjust[0]++; |
| 1782 | } |
| 1783 | /* skip remaining digits */ |
| 1784 | while (s < send && isDIGIT(*s)) { |
| 1785 | ++s; |
| 1786 | if (! seen_dp) { |
| 1787 | exp_adjust[0]++; |
| 1788 | } |
| 1789 | } |
| 1790 | /* warn of loss of precision? */ |
| 1791 | } |
| 1792 | else { |
| 1793 | if (accumulator[seen_dp] > MAX_ACCUMULATE) { |
| 1794 | /* add accumulator to result and start again */ |
| 1795 | result[seen_dp] = S_mulexp10(result[seen_dp], |
| 1796 | exp_acc[seen_dp]) |
| 1797 | + (NV)accumulator[seen_dp]; |
| 1798 | accumulator[seen_dp] = 0; |
| 1799 | exp_acc[seen_dp] = 0; |
| 1800 | } |
| 1801 | accumulator[seen_dp] = accumulator[seen_dp] * 10 + digit; |
| 1802 | ++exp_acc[seen_dp]; |
| 1803 | } |
| 1804 | } |
| 1805 | else if (!seen_dp && GROK_NUMERIC_RADIX(&s, send)) { |
| 1806 | seen_dp = 1; |
| 1807 | if (sig_digits > MAX_SIG_DIGITS) { |
| 1808 | while (s < send && isDIGIT(*s)) { |
| 1809 | ++s; |
| 1810 | } |
| 1811 | break; |
| 1812 | } |
| 1813 | } |
| 1814 | else { |
| 1815 | break; |
| 1816 | } |
| 1817 | } |
| 1818 | |
| 1819 | result[0] = S_mulexp10(result[0], exp_acc[0]) + (NV)accumulator[0]; |
| 1820 | if (seen_dp) { |
| 1821 | result[1] = S_mulexp10(result[1], exp_acc[1]) + (NV)accumulator[1]; |
| 1822 | } |
| 1823 | |
| 1824 | if (s < send && seen_digit && (isALPHA_FOLD_EQ(*s, 'e'))) { |
| 1825 | bool expnegative = 0; |
| 1826 | |
| 1827 | ++s; |
| 1828 | switch (*s) { |
| 1829 | case '-': |
| 1830 | expnegative = 1; |
| 1831 | /* FALLTHROUGH */ |
| 1832 | case '+': |
| 1833 | ++s; |
| 1834 | } |
| 1835 | while (s < send && isDIGIT(*s)) |
| 1836 | exponent = exponent * 10 + (*s++ - '0'); |
| 1837 | if (expnegative) |
| 1838 | exponent = -exponent; |
| 1839 | } |
| 1840 | |
| 1841 | /* now apply the exponent */ |
| 1842 | |
| 1843 | if (seen_dp) { |
| 1844 | result[2] = S_mulexp10(result[0],exponent+exp_adjust[0]) |
| 1845 | + S_mulexp10(result[1],exponent-exp_adjust[1]); |
| 1846 | } else { |
| 1847 | result[2] = S_mulexp10(result[0],exponent+exp_adjust[0]); |
| 1848 | } |
| 1849 | |
| 1850 | /* now apply the sign */ |
| 1851 | if (negative) |
| 1852 | result[2] = -result[2]; |
| 1853 | *value = result[2]; |
| 1854 | return (char *)s; |
| 1855 | #else /* USE_PERL_ATOF */ |
| 1856 | /* If you see this error you both don't have strtod (or configured -Ud_strtod or |
| 1857 | or it's long double/quadmath equivalent) and disabled USE_PERL_ATOF, thus |
| 1858 | removing any way for perl to convert strings to floating point numbers. |
| 1859 | */ |
| 1860 | # error No mechanism to convert strings to numbers available |
| 1861 | #endif |
| 1862 | } |
| 1863 | |
| 1864 | /* |
| 1865 | =for apidoc isinfnan |
| 1866 | |
| 1867 | C<Perl_isinfnan()> is a utility function that returns true if the NV |
| 1868 | argument is either an infinity or a C<NaN>, false otherwise. To test |
| 1869 | in more detail, use C<Perl_isinf()> and C<Perl_isnan()>. |
| 1870 | |
| 1871 | This is also the logical inverse of Perl_isfinite(). |
| 1872 | |
| 1873 | =cut |
| 1874 | */ |
| 1875 | bool |
| 1876 | Perl_isinfnan(NV nv) |
| 1877 | { |
| 1878 | PERL_UNUSED_ARG(nv); |
| 1879 | #ifdef Perl_isinf |
| 1880 | if (Perl_isinf(nv)) |
| 1881 | return TRUE; |
| 1882 | #endif |
| 1883 | #ifdef Perl_isnan |
| 1884 | if (Perl_isnan(nv)) |
| 1885 | return TRUE; |
| 1886 | #endif |
| 1887 | return FALSE; |
| 1888 | } |
| 1889 | |
| 1890 | /* |
| 1891 | =for apidoc isinfnansv |
| 1892 | |
| 1893 | Checks whether the argument would be either an infinity or C<NaN> when used |
| 1894 | as a number, but is careful not to trigger non-numeric or uninitialized |
| 1895 | warnings. it assumes the caller has done C<SvGETMAGIC(sv)> already. |
| 1896 | |
| 1897 | Note that this always accepts trailing garbage (similar to C<grok_number_flags> |
| 1898 | with C<PERL_SCAN_TRAILING>), so C<"inferior"> and C<"NAND gates"> will |
| 1899 | return true. |
| 1900 | |
| 1901 | =cut |
| 1902 | */ |
| 1903 | |
| 1904 | bool |
| 1905 | Perl_isinfnansv(pTHX_ SV *sv) |
| 1906 | { |
| 1907 | PERL_ARGS_ASSERT_ISINFNANSV; |
| 1908 | if (!SvOK(sv)) |
| 1909 | return FALSE; |
| 1910 | if (SvNOKp(sv)) |
| 1911 | return Perl_isinfnan(SvNVX(sv)); |
| 1912 | if (SvIOKp(sv)) |
| 1913 | return FALSE; |
| 1914 | { |
| 1915 | STRLEN len; |
| 1916 | const char *s = SvPV_nomg_const(sv, len); |
| 1917 | return cBOOL(grok_infnan(&s, s+len)); |
| 1918 | } |
| 1919 | } |
| 1920 | |
| 1921 | #ifndef HAS_MODFL |
| 1922 | /* C99 has truncl, pre-C99 Solaris had aintl. We can use either with |
| 1923 | * copysignl to emulate modfl, which is in some platforms missing or |
| 1924 | * broken. */ |
| 1925 | # if defined(HAS_TRUNCL) && defined(HAS_COPYSIGNL) |
| 1926 | long double |
| 1927 | Perl_my_modfl(long double x, long double *ip) |
| 1928 | { |
| 1929 | *ip = truncl(x); |
| 1930 | return (x == *ip ? copysignl(0.0L, x) : x - *ip); |
| 1931 | } |
| 1932 | # elif defined(HAS_AINTL) && defined(HAS_COPYSIGNL) |
| 1933 | long double |
| 1934 | Perl_my_modfl(long double x, long double *ip) |
| 1935 | { |
| 1936 | *ip = aintl(x); |
| 1937 | return (x == *ip ? copysignl(0.0L, x) : x - *ip); |
| 1938 | } |
| 1939 | # endif |
| 1940 | #endif |
| 1941 | |
| 1942 | /* Similarly, with ilogbl and scalbnl we can emulate frexpl. */ |
| 1943 | #if ! defined(HAS_FREXPL) && defined(HAS_ILOGBL) && defined(HAS_SCALBNL) |
| 1944 | long double |
| 1945 | Perl_my_frexpl(long double x, int *e) { |
| 1946 | *e = x == 0.0L ? 0 : ilogbl(x) + 1; |
| 1947 | return (scalbnl(x, -*e)); |
| 1948 | } |
| 1949 | #endif |
| 1950 | |
| 1951 | /* |
| 1952 | =for apidoc Perl_signbit |
| 1953 | |
| 1954 | Return a non-zero integer if the sign bit on an NV is set, and 0 if |
| 1955 | it is not. |
| 1956 | |
| 1957 | If F<Configure> detects this system has a C<signbit()> that will work with |
| 1958 | our NVs, then we just use it via the C<#define> in F<perl.h>. Otherwise, |
| 1959 | fall back on this implementation. The main use of this function |
| 1960 | is catching C<-0.0>. |
| 1961 | |
| 1962 | C<Configure> notes: This function is called C<'Perl_signbit'> instead of a |
| 1963 | plain C<'signbit'> because it is easy to imagine a system having a C<signbit()> |
| 1964 | function or macro that doesn't happen to work with our particular choice |
| 1965 | of NVs. We shouldn't just re-C<#define> C<signbit> as C<Perl_signbit> and expect |
| 1966 | the standard system headers to be happy. Also, this is a no-context |
| 1967 | function (no C<pTHX_>) because C<Perl_signbit()> is usually re-C<#defined> in |
| 1968 | F<perl.h> as a simple macro call to the system's C<signbit()>. |
| 1969 | Users should just always call C<Perl_signbit()>. |
| 1970 | |
| 1971 | =cut |
| 1972 | */ |
| 1973 | #if !defined(HAS_SIGNBIT) |
| 1974 | int |
| 1975 | Perl_signbit(NV x) { |
| 1976 | # ifdef Perl_fp_class_nzero |
| 1977 | return Perl_fp_class_nzero(x); |
| 1978 | /* Try finding the high byte, and assume it's highest bit |
| 1979 | * is the sign. This assumption is probably wrong somewhere. */ |
| 1980 | # elif defined(USE_LONG_DOUBLE) && LONG_DOUBLEKIND == LONG_DOUBLE_IS_X86_80_BIT_LITTLE_ENDIAN |
| 1981 | return (((unsigned char *)&x)[9] & 0x80); |
| 1982 | # elif defined(NV_LITTLE_ENDIAN) |
| 1983 | /* Note that NVSIZE is sizeof(NV), which would make the below be |
| 1984 | * wrong if the end bytes are unused, which happens with the x86 |
| 1985 | * 80-bit long doubles, which is why take care of that above. */ |
| 1986 | return (((unsigned char *)&x)[NVSIZE - 1] & 0x80); |
| 1987 | # elif defined(NV_BIG_ENDIAN) |
| 1988 | return (((unsigned char *)&x)[0] & 0x80); |
| 1989 | # else |
| 1990 | /* This last resort fallback is wrong for the negative zero. */ |
| 1991 | return (x < 0.0) ? 1 : 0; |
| 1992 | # endif |
| 1993 | } |
| 1994 | #endif |
| 1995 | |
| 1996 | /* |
| 1997 | * ex: set ts=8 sts=4 sw=4 et: |
| 1998 | */ |