| 1 | /* inline.h |
| 2 | * |
| 3 | * Copyright (C) 2012 by Larry Wall and others |
| 4 | * |
| 5 | * You may distribute under the terms of either the GNU General Public |
| 6 | * License or the Artistic License, as specified in the README file. |
| 7 | * |
| 8 | * This file is a home for static inline functions that cannot go in other |
| 9 | * headers files, because they depend on proto.h (included after most other |
| 10 | * headers) or struct definitions. |
| 11 | * |
| 12 | * Each section names the header file that the functions "belong" to. |
| 13 | */ |
| 14 | |
| 15 | /* ------------------------------- av.h ------------------------------- */ |
| 16 | |
| 17 | PERL_STATIC_INLINE SSize_t |
| 18 | S_av_top_index(pTHX_ AV *av) |
| 19 | { |
| 20 | PERL_ARGS_ASSERT_AV_TOP_INDEX; |
| 21 | assert(SvTYPE(av) == SVt_PVAV); |
| 22 | |
| 23 | return AvFILL(av); |
| 24 | } |
| 25 | |
| 26 | /* ------------------------------- cv.h ------------------------------- */ |
| 27 | |
| 28 | PERL_STATIC_INLINE GV * |
| 29 | S_CvGV(pTHX_ CV *sv) |
| 30 | { |
| 31 | return CvNAMED(sv) |
| 32 | ? Perl_cvgv_from_hek(aTHX_ sv) |
| 33 | : ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_gv_u.xcv_gv; |
| 34 | } |
| 35 | |
| 36 | PERL_STATIC_INLINE I32 * |
| 37 | S_CvDEPTHp(const CV * const sv) |
| 38 | { |
| 39 | assert(SvTYPE(sv) == SVt_PVCV || SvTYPE(sv) == SVt_PVFM); |
| 40 | return &((XPVCV*)SvANY(sv))->xcv_depth; |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | CvPROTO returns the prototype as stored, which is not necessarily what |
| 45 | the interpreter should be using. Specifically, the interpreter assumes |
| 46 | that spaces have been stripped, which has been the case if the prototype |
| 47 | was added by toke.c, but is generally not the case if it was added elsewhere. |
| 48 | Since we can't enforce the spacelessness at assignment time, this routine |
| 49 | provides a temporary copy at parse time with spaces removed. |
| 50 | I<orig> is the start of the original buffer, I<len> is the length of the |
| 51 | prototype and will be updated when this returns. |
| 52 | */ |
| 53 | |
| 54 | #ifdef PERL_CORE |
| 55 | PERL_STATIC_INLINE char * |
| 56 | S_strip_spaces(pTHX_ const char * orig, STRLEN * const len) |
| 57 | { |
| 58 | SV * tmpsv; |
| 59 | char * tmps; |
| 60 | tmpsv = newSVpvn_flags(orig, *len, SVs_TEMP); |
| 61 | tmps = SvPVX(tmpsv); |
| 62 | while ((*len)--) { |
| 63 | if (!isSPACE(*orig)) |
| 64 | *tmps++ = *orig; |
| 65 | orig++; |
| 66 | } |
| 67 | *tmps = '\0'; |
| 68 | *len = tmps - SvPVX(tmpsv); |
| 69 | return SvPVX(tmpsv); |
| 70 | } |
| 71 | #endif |
| 72 | |
| 73 | /* ------------------------------- mg.h ------------------------------- */ |
| 74 | |
| 75 | #if defined(PERL_CORE) || defined(PERL_EXT) |
| 76 | /* assumes get-magic and stringification have already occurred */ |
| 77 | PERL_STATIC_INLINE STRLEN |
| 78 | S_MgBYTEPOS(pTHX_ MAGIC *mg, SV *sv, const char *s, STRLEN len) |
| 79 | { |
| 80 | assert(mg->mg_type == PERL_MAGIC_regex_global); |
| 81 | assert(mg->mg_len != -1); |
| 82 | if (mg->mg_flags & MGf_BYTES || !DO_UTF8(sv)) |
| 83 | return (STRLEN)mg->mg_len; |
| 84 | else { |
| 85 | const STRLEN pos = (STRLEN)mg->mg_len; |
| 86 | /* Without this check, we may read past the end of the buffer: */ |
| 87 | if (pos > sv_or_pv_len_utf8(sv, s, len)) return len+1; |
| 88 | return sv_or_pv_pos_u2b(sv, s, pos, NULL); |
| 89 | } |
| 90 | } |
| 91 | #endif |
| 92 | |
| 93 | /* ------------------------------- pad.h ------------------------------ */ |
| 94 | |
| 95 | #if defined(PERL_IN_PAD_C) || defined(PERL_IN_OP_C) |
| 96 | PERL_STATIC_INLINE bool |
| 97 | PadnameIN_SCOPE(const PADNAME * const pn, const U32 seq) |
| 98 | { |
| 99 | /* is seq within the range _LOW to _HIGH ? |
| 100 | * This is complicated by the fact that PL_cop_seqmax |
| 101 | * may have wrapped around at some point */ |
| 102 | if (COP_SEQ_RANGE_LOW(pn) == PERL_PADSEQ_INTRO) |
| 103 | return FALSE; /* not yet introduced */ |
| 104 | |
| 105 | if (COP_SEQ_RANGE_HIGH(pn) == PERL_PADSEQ_INTRO) { |
| 106 | /* in compiling scope */ |
| 107 | if ( |
| 108 | (seq > COP_SEQ_RANGE_LOW(pn)) |
| 109 | ? (seq - COP_SEQ_RANGE_LOW(pn) < (U32_MAX >> 1)) |
| 110 | : (COP_SEQ_RANGE_LOW(pn) - seq > (U32_MAX >> 1)) |
| 111 | ) |
| 112 | return TRUE; |
| 113 | } |
| 114 | else if ( |
| 115 | (COP_SEQ_RANGE_LOW(pn) > COP_SEQ_RANGE_HIGH(pn)) |
| 116 | ? |
| 117 | ( seq > COP_SEQ_RANGE_LOW(pn) |
| 118 | || seq <= COP_SEQ_RANGE_HIGH(pn)) |
| 119 | |
| 120 | : ( seq > COP_SEQ_RANGE_LOW(pn) |
| 121 | && seq <= COP_SEQ_RANGE_HIGH(pn)) |
| 122 | ) |
| 123 | return TRUE; |
| 124 | return FALSE; |
| 125 | } |
| 126 | #endif |
| 127 | |
| 128 | /* ------------------------------- pp.h ------------------------------- */ |
| 129 | |
| 130 | PERL_STATIC_INLINE I32 |
| 131 | S_TOPMARK(pTHX) |
| 132 | { |
| 133 | DEBUG_s(DEBUG_v(PerlIO_printf(Perl_debug_log, |
| 134 | "MARK top %p %" IVdf "\n", |
| 135 | PL_markstack_ptr, |
| 136 | (IV)*PL_markstack_ptr))); |
| 137 | return *PL_markstack_ptr; |
| 138 | } |
| 139 | |
| 140 | PERL_STATIC_INLINE I32 |
| 141 | S_POPMARK(pTHX) |
| 142 | { |
| 143 | DEBUG_s(DEBUG_v(PerlIO_printf(Perl_debug_log, |
| 144 | "MARK pop %p %" IVdf "\n", |
| 145 | (PL_markstack_ptr-1), |
| 146 | (IV)*(PL_markstack_ptr-1)))); |
| 147 | assert((PL_markstack_ptr > PL_markstack) || !"MARK underflow"); |
| 148 | return *PL_markstack_ptr--; |
| 149 | } |
| 150 | |
| 151 | /* ----------------------------- regexp.h ----------------------------- */ |
| 152 | |
| 153 | PERL_STATIC_INLINE struct regexp * |
| 154 | S_ReANY(const REGEXP * const re) |
| 155 | { |
| 156 | XPV* const p = (XPV*)SvANY(re); |
| 157 | assert(isREGEXP(re)); |
| 158 | return SvTYPE(re) == SVt_PVLV ? p->xpv_len_u.xpvlenu_rx |
| 159 | : (struct regexp *)p; |
| 160 | } |
| 161 | |
| 162 | /* ------------------------------- sv.h ------------------------------- */ |
| 163 | |
| 164 | PERL_STATIC_INLINE SV * |
| 165 | S_SvREFCNT_inc(SV *sv) |
| 166 | { |
| 167 | if (LIKELY(sv != NULL)) |
| 168 | SvREFCNT(sv)++; |
| 169 | return sv; |
| 170 | } |
| 171 | PERL_STATIC_INLINE SV * |
| 172 | S_SvREFCNT_inc_NN(SV *sv) |
| 173 | { |
| 174 | SvREFCNT(sv)++; |
| 175 | return sv; |
| 176 | } |
| 177 | PERL_STATIC_INLINE void |
| 178 | S_SvREFCNT_inc_void(SV *sv) |
| 179 | { |
| 180 | if (LIKELY(sv != NULL)) |
| 181 | SvREFCNT(sv)++; |
| 182 | } |
| 183 | PERL_STATIC_INLINE void |
| 184 | S_SvREFCNT_dec(pTHX_ SV *sv) |
| 185 | { |
| 186 | if (LIKELY(sv != NULL)) { |
| 187 | U32 rc = SvREFCNT(sv); |
| 188 | if (LIKELY(rc > 1)) |
| 189 | SvREFCNT(sv) = rc - 1; |
| 190 | else |
| 191 | Perl_sv_free2(aTHX_ sv, rc); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | PERL_STATIC_INLINE void |
| 196 | S_SvREFCNT_dec_NN(pTHX_ SV *sv) |
| 197 | { |
| 198 | U32 rc = SvREFCNT(sv); |
| 199 | if (LIKELY(rc > 1)) |
| 200 | SvREFCNT(sv) = rc - 1; |
| 201 | else |
| 202 | Perl_sv_free2(aTHX_ sv, rc); |
| 203 | } |
| 204 | |
| 205 | PERL_STATIC_INLINE void |
| 206 | SvAMAGIC_on(SV *sv) |
| 207 | { |
| 208 | assert(SvROK(sv)); |
| 209 | if (SvOBJECT(SvRV(sv))) HvAMAGIC_on(SvSTASH(SvRV(sv))); |
| 210 | } |
| 211 | PERL_STATIC_INLINE void |
| 212 | SvAMAGIC_off(SV *sv) |
| 213 | { |
| 214 | if (SvROK(sv) && SvOBJECT(SvRV(sv))) |
| 215 | HvAMAGIC_off(SvSTASH(SvRV(sv))); |
| 216 | } |
| 217 | |
| 218 | PERL_STATIC_INLINE U32 |
| 219 | S_SvPADSTALE_on(SV *sv) |
| 220 | { |
| 221 | assert(!(SvFLAGS(sv) & SVs_PADTMP)); |
| 222 | return SvFLAGS(sv) |= SVs_PADSTALE; |
| 223 | } |
| 224 | PERL_STATIC_INLINE U32 |
| 225 | S_SvPADSTALE_off(SV *sv) |
| 226 | { |
| 227 | assert(!(SvFLAGS(sv) & SVs_PADTMP)); |
| 228 | return SvFLAGS(sv) &= ~SVs_PADSTALE; |
| 229 | } |
| 230 | #if defined(PERL_CORE) || defined (PERL_EXT) |
| 231 | PERL_STATIC_INLINE STRLEN |
| 232 | S_sv_or_pv_pos_u2b(pTHX_ SV *sv, const char *pv, STRLEN pos, STRLEN *lenp) |
| 233 | { |
| 234 | PERL_ARGS_ASSERT_SV_OR_PV_POS_U2B; |
| 235 | if (SvGAMAGIC(sv)) { |
| 236 | U8 *hopped = utf8_hop((U8 *)pv, pos); |
| 237 | if (lenp) *lenp = (STRLEN)(utf8_hop(hopped, *lenp) - hopped); |
| 238 | return (STRLEN)(hopped - (U8 *)pv); |
| 239 | } |
| 240 | return sv_pos_u2b_flags(sv,pos,lenp,SV_CONST_RETURN); |
| 241 | } |
| 242 | #endif |
| 243 | |
| 244 | /* ------------------------------- handy.h ------------------------------- */ |
| 245 | |
| 246 | /* saves machine code for a common noreturn idiom typically used in Newx*() */ |
| 247 | GCC_DIAG_IGNORE_DECL(-Wunused-function); |
| 248 | static void |
| 249 | S_croak_memory_wrap(void) |
| 250 | { |
| 251 | Perl_croak_nocontext("%s",PL_memory_wrap); |
| 252 | } |
| 253 | GCC_DIAG_RESTORE_DECL; |
| 254 | |
| 255 | /* ------------------------------- utf8.h ------------------------------- */ |
| 256 | |
| 257 | /* |
| 258 | =head1 Unicode Support |
| 259 | */ |
| 260 | |
| 261 | PERL_STATIC_INLINE void |
| 262 | S_append_utf8_from_native_byte(const U8 byte, U8** dest) |
| 263 | { |
| 264 | /* Takes an input 'byte' (Latin1 or EBCDIC) and appends it to the UTF-8 |
| 265 | * encoded string at '*dest', updating '*dest' to include it */ |
| 266 | |
| 267 | PERL_ARGS_ASSERT_APPEND_UTF8_FROM_NATIVE_BYTE; |
| 268 | |
| 269 | if (NATIVE_BYTE_IS_INVARIANT(byte)) |
| 270 | *((*dest)++) = byte; |
| 271 | else { |
| 272 | *((*dest)++) = UTF8_EIGHT_BIT_HI(byte); |
| 273 | *((*dest)++) = UTF8_EIGHT_BIT_LO(byte); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | =for apidoc valid_utf8_to_uvchr |
| 279 | Like C<L</utf8_to_uvchr_buf>>, but should only be called when it is known that |
| 280 | the next character in the input UTF-8 string C<s> is well-formed (I<e.g.>, |
| 281 | it passes C<L</isUTF8_CHAR>>. Surrogates, non-character code points, and |
| 282 | non-Unicode code points are allowed. |
| 283 | |
| 284 | =cut |
| 285 | |
| 286 | */ |
| 287 | |
| 288 | PERL_STATIC_INLINE UV |
| 289 | Perl_valid_utf8_to_uvchr(const U8 *s, STRLEN *retlen) |
| 290 | { |
| 291 | const UV expectlen = UTF8SKIP(s); |
| 292 | const U8* send = s + expectlen; |
| 293 | UV uv = *s; |
| 294 | |
| 295 | PERL_ARGS_ASSERT_VALID_UTF8_TO_UVCHR; |
| 296 | |
| 297 | if (retlen) { |
| 298 | *retlen = expectlen; |
| 299 | } |
| 300 | |
| 301 | /* An invariant is trivially returned */ |
| 302 | if (expectlen == 1) { |
| 303 | return uv; |
| 304 | } |
| 305 | |
| 306 | /* Remove the leading bits that indicate the number of bytes, leaving just |
| 307 | * the bits that are part of the value */ |
| 308 | uv = NATIVE_UTF8_TO_I8(uv) & UTF_START_MASK(expectlen); |
| 309 | |
| 310 | /* Now, loop through the remaining bytes, accumulating each into the |
| 311 | * working total as we go. (I khw tried unrolling the loop for up to 4 |
| 312 | * bytes, but there was no performance improvement) */ |
| 313 | for (++s; s < send; s++) { |
| 314 | uv = UTF8_ACCUMULATE(uv, *s); |
| 315 | } |
| 316 | |
| 317 | return UNI_TO_NATIVE(uv); |
| 318 | |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | =for apidoc is_utf8_invariant_string |
| 323 | |
| 324 | Returns TRUE if the first C<len> bytes of the string C<s> are the same |
| 325 | regardless of the UTF-8 encoding of the string (or UTF-EBCDIC encoding on |
| 326 | EBCDIC machines); otherwise it returns FALSE. That is, it returns TRUE if they |
| 327 | are UTF-8 invariant. On ASCII-ish machines, all the ASCII characters and only |
| 328 | the ASCII characters fit this definition. On EBCDIC machines, the ASCII-range |
| 329 | characters are invariant, but so also are the C1 controls. |
| 330 | |
| 331 | If C<len> is 0, it will be calculated using C<strlen(s)>, (which means if you |
| 332 | use this option, that C<s> can't have embedded C<NUL> characters and has to |
| 333 | have a terminating C<NUL> byte). |
| 334 | |
| 335 | See also |
| 336 | C<L</is_utf8_string>>, |
| 337 | C<L</is_utf8_string_flags>>, |
| 338 | C<L</is_utf8_string_loc>>, |
| 339 | C<L</is_utf8_string_loc_flags>>, |
| 340 | C<L</is_utf8_string_loclen>>, |
| 341 | C<L</is_utf8_string_loclen_flags>>, |
| 342 | C<L</is_utf8_fixed_width_buf_flags>>, |
| 343 | C<L</is_utf8_fixed_width_buf_loc_flags>>, |
| 344 | C<L</is_utf8_fixed_width_buf_loclen_flags>>, |
| 345 | C<L</is_strict_utf8_string>>, |
| 346 | C<L</is_strict_utf8_string_loc>>, |
| 347 | C<L</is_strict_utf8_string_loclen>>, |
| 348 | C<L</is_c9strict_utf8_string>>, |
| 349 | C<L</is_c9strict_utf8_string_loc>>, |
| 350 | and |
| 351 | C<L</is_c9strict_utf8_string_loclen>>. |
| 352 | |
| 353 | =cut |
| 354 | |
| 355 | */ |
| 356 | |
| 357 | #define is_utf8_invariant_string(s, len) \ |
| 358 | is_utf8_invariant_string_loc(s, len, NULL) |
| 359 | |
| 360 | /* |
| 361 | =for apidoc is_utf8_invariant_string_loc |
| 362 | |
| 363 | Like C<L</is_utf8_invariant_string>> but upon failure, stores the location of |
| 364 | the first UTF-8 variant character in the C<ep> pointer; if all characters are |
| 365 | UTF-8 invariant, this function does not change the contents of C<*ep>. |
| 366 | |
| 367 | =cut |
| 368 | |
| 369 | */ |
| 370 | |
| 371 | PERL_STATIC_INLINE bool |
| 372 | S_is_utf8_invariant_string_loc(const U8* const s, STRLEN len, const U8 ** ep) |
| 373 | { |
| 374 | const U8* send; |
| 375 | const U8* x = s; |
| 376 | |
| 377 | PERL_ARGS_ASSERT_IS_UTF8_INVARIANT_STRING_LOC; |
| 378 | |
| 379 | if (len == 0) { |
| 380 | len = strlen((const char *)s); |
| 381 | } |
| 382 | |
| 383 | send = s + len; |
| 384 | |
| 385 | #ifndef EBCDIC |
| 386 | |
| 387 | /* This looks like 0x010101... */ |
| 388 | #define PERL_COUNT_MULTIPLIER (~ (UINTMAX_C(0)) / 0xFF) |
| 389 | |
| 390 | /* This looks like 0x808080... */ |
| 391 | #define PERL_VARIANTS_WORD_MASK (PERL_COUNT_MULTIPLIER * 0x80) |
| 392 | #define PERL_WORDSIZE sizeof(PERL_COUNT_MULTIPLIER) |
| 393 | #define PERL_WORD_BOUNDARY_MASK (PERL_WORDSIZE - 1) |
| 394 | |
| 395 | /* Evaluates to 0 if 'x' is at a word boundary; otherwise evaluates to 1, by |
| 396 | * or'ing together the lowest bits of 'x'. Hopefully the final term gets |
| 397 | * optimized out completely on a 32-bit system, and its mask gets optimized out |
| 398 | * on a 64-bit system */ |
| 399 | #define PERL_IS_SUBWORD_ADDR(x) (1 & ( PTR2nat(x) \ |
| 400 | | ( PTR2nat(x) >> 1) \ |
| 401 | | ( ( (PTR2nat(x) \ |
| 402 | & PERL_WORD_BOUNDARY_MASK) >> 2)))) |
| 403 | |
| 404 | /* Do the word-at-a-time iff there is at least one usable full word. That |
| 405 | * means that after advancing to a word boundary, there still is at least a |
| 406 | * full word left. The number of bytes needed to advance is 'wordsize - |
| 407 | * offset' unless offset is 0. */ |
| 408 | if ((STRLEN) (send - x) >= PERL_WORDSIZE |
| 409 | |
| 410 | /* This term is wordsize if subword; 0 if not */ |
| 411 | + PERL_WORDSIZE * PERL_IS_SUBWORD_ADDR(x) |
| 412 | |
| 413 | /* 'offset' */ |
| 414 | - (PTR2nat(x) & PERL_WORD_BOUNDARY_MASK)) |
| 415 | { |
| 416 | |
| 417 | /* Process per-byte until reach word boundary. XXX This loop could be |
| 418 | * eliminated if we knew that this platform had fast unaligned reads */ |
| 419 | while (PTR2nat(x) & PERL_WORD_BOUNDARY_MASK) { |
| 420 | if (! UTF8_IS_INVARIANT(*x)) { |
| 421 | if (ep) { |
| 422 | *ep = x; |
| 423 | } |
| 424 | |
| 425 | return FALSE; |
| 426 | } |
| 427 | x++; |
| 428 | } |
| 429 | |
| 430 | /* Here, we know we have at least one full word to process. Process |
| 431 | * per-word as long as we have at least a full word left */ |
| 432 | do { |
| 433 | if ((* (PERL_UINTMAX_T *) x) & PERL_VARIANTS_WORD_MASK) { |
| 434 | |
| 435 | /* Found a variant. Just return if caller doesn't want its |
| 436 | * exact position */ |
| 437 | if (! ep) { |
| 438 | return FALSE; |
| 439 | } |
| 440 | |
| 441 | #if BYTEORDER == 0x1234 || BYTEORDER == 0x12345678 \ |
| 442 | || BYTEORDER == 0x4321 || BYTEORDER == 0x87654321 |
| 443 | |
| 444 | *ep = x + _variant_byte_number(* (PERL_UINTMAX_T *) x); |
| 445 | assert(*ep >= s && *ep < send); |
| 446 | |
| 447 | return FALSE; |
| 448 | |
| 449 | #else /* If weird byte order, drop into next loop to do byte-at-a-time |
| 450 | checks. */ |
| 451 | |
| 452 | break; |
| 453 | #endif |
| 454 | } |
| 455 | |
| 456 | x += PERL_WORDSIZE; |
| 457 | |
| 458 | } while (x + PERL_WORDSIZE <= send); |
| 459 | } |
| 460 | |
| 461 | #endif /* End of ! EBCDIC */ |
| 462 | |
| 463 | /* Process per-byte */ |
| 464 | while (x < send) { |
| 465 | if (! UTF8_IS_INVARIANT(*x)) { |
| 466 | if (ep) { |
| 467 | *ep = x; |
| 468 | } |
| 469 | |
| 470 | return FALSE; |
| 471 | } |
| 472 | |
| 473 | x++; |
| 474 | } |
| 475 | |
| 476 | return TRUE; |
| 477 | } |
| 478 | |
| 479 | PERL_STATIC_INLINE unsigned int |
| 480 | S__variant_byte_number(PERL_UINTMAX_T word) |
| 481 | { |
| 482 | |
| 483 | /* This returns the position in a word (0..7) of the first variant byte in |
| 484 | * it. This is a helper function. Note that there are no branches */ |
| 485 | |
| 486 | assert(word); |
| 487 | |
| 488 | /* Get just the msb bits of each byte */ |
| 489 | word &= PERL_VARIANTS_WORD_MASK; |
| 490 | |
| 491 | # ifdef USING_MSVC6 /* VC6 has some issues with the normal code, and the |
| 492 | easiest thing is to hide that from the callers */ |
| 493 | { |
| 494 | unsigned int i; |
| 495 | const U8 * s = (U8 *) &word; |
| 496 | dTHX; |
| 497 | |
| 498 | for (i = 0; i < sizeof(word); i++ ) { |
| 499 | if (s[i]) { |
| 500 | return i; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | Perl_croak(aTHX_ "panic: %s: %d: unexpected zero word\n", |
| 505 | __FILE__, __LINE__); |
| 506 | } |
| 507 | |
| 508 | # elif BYTEORDER == 0x1234 || BYTEORDER == 0x12345678 |
| 509 | |
| 510 | /* Bytes are stored like |
| 511 | * Byte8 ... Byte2 Byte1 |
| 512 | * 63..56...15...8 7...0 |
| 513 | * |
| 514 | * Isolate the lsb; |
| 515 | * https://stackoverflow.com/questions/757059/position-of-least-significant-bit-that-is-set |
| 516 | * |
| 517 | * The word will look this this, with a rightmost set bit in position 's': |
| 518 | * ('x's are don't cares) |
| 519 | * s |
| 520 | * x..x100..0 |
| 521 | * x..xx10..0 Right shift (rightmost 0 is shifted off) |
| 522 | * x..xx01..1 Subtract 1, turns all the trailing zeros into 1's and |
| 523 | * the 1 just to their left into a 0; the remainder is |
| 524 | * untouched |
| 525 | * 0..0011..1 The xor with x..xx10..0 clears that remainder, sets |
| 526 | * bottom to all 1 |
| 527 | * 0..0100..0 Add 1 to clear the word except for the bit in 's' |
| 528 | * |
| 529 | * Another method is to do 'word &= -word'; but it generates a compiler |
| 530 | * message on some platforms about taking the negative of an unsigned */ |
| 531 | |
| 532 | word >>= 1; |
| 533 | word = 1 + (word ^ (word - 1)); |
| 534 | |
| 535 | # elif BYTEORDER == 0x4321 || BYTEORDER == 0x87654321 |
| 536 | |
| 537 | /* Bytes are stored like |
| 538 | * Byte1 Byte2 ... Byte8 |
| 539 | * 63..56 55..47 ... 7...0 |
| 540 | * |
| 541 | * Isolate the msb; http://codeforces.com/blog/entry/10330 |
| 542 | * |
| 543 | * Only the most significant set bit matters. Or'ing word with its right |
| 544 | * shift of 1 makes that bit and the next one to its right both 1. Then |
| 545 | * right shifting by 2 makes for 4 1-bits in a row. ... We end with the |
| 546 | * msb and all to the right being 1. */ |
| 547 | word |= word >> 1; |
| 548 | word |= word >> 2; |
| 549 | word |= word >> 4; |
| 550 | word |= word >> 8; |
| 551 | word |= word >> 16; |
| 552 | word |= word >> 32; /* This should get optimized out on 32-bit systems. */ |
| 553 | |
| 554 | /* Then subtracting the right shift by 1 clears all but the left-most of |
| 555 | * the 1 bits, which is our desired result */ |
| 556 | word -= (word >> 1); |
| 557 | |
| 558 | # else |
| 559 | # error Unexpected byte order |
| 560 | # endif |
| 561 | |
| 562 | /* Here 'word' has a single bit set: the msb of the first byte in which it |
| 563 | * is set. Calculate that position in the word. We can use this |
| 564 | * specialized solution: https://stackoverflow.com/a/32339674/1626653, |
| 565 | * assumes an 8-bit byte. (On a 32-bit machine, the larger numbers should |
| 566 | * just get shifted off at compile time) */ |
| 567 | word = (word >> 7) * ((UINTMAX_C( 7) << 56) | (UINTMAX_C(15) << 48) |
| 568 | | (UINTMAX_C(23) << 40) | (UINTMAX_C(31) << 32) |
| 569 | | (39 << 24) | (47 << 16) |
| 570 | | (55 << 8) | (63 << 0)); |
| 571 | word >>= PERL_WORDSIZE * 7; /* >> by either 56 or 24 */ |
| 572 | |
| 573 | /* Here, word contains the position 7..63 of that bit. Convert to 0..7 */ |
| 574 | word = ((word + 1) >> 3) - 1; |
| 575 | |
| 576 | # if BYTEORDER == 0x4321 || BYTEORDER == 0x87654321 |
| 577 | |
| 578 | /* And invert the result */ |
| 579 | word = CHARBITS - word - 1; |
| 580 | |
| 581 | # endif |
| 582 | |
| 583 | return (unsigned int) word; |
| 584 | } |
| 585 | |
| 586 | #if defined(PERL_CORE) || defined(PERL_EXT) |
| 587 | |
| 588 | /* |
| 589 | =for apidoc variant_under_utf8_count |
| 590 | |
| 591 | This function looks at the sequence of bytes between C<s> and C<e>, which are |
| 592 | assumed to be encoded in ASCII/Latin1, and returns how many of them would |
| 593 | change should the string be translated into UTF-8. Due to the nature of UTF-8, |
| 594 | each of these would occupy two bytes instead of the single one in the input |
| 595 | string. Thus, this function returns the precise number of bytes the string |
| 596 | would expand by when translated to UTF-8. |
| 597 | |
| 598 | Unlike most of the other functions that have C<utf8> in their name, the input |
| 599 | to this function is NOT a UTF-8-encoded string. The function name is slightly |
| 600 | I<odd> to emphasize this. |
| 601 | |
| 602 | This function is internal to Perl because khw thinks that any XS code that |
| 603 | would want this is probably operating too close to the internals. Presenting a |
| 604 | valid use case could change that. |
| 605 | |
| 606 | See also |
| 607 | C<L<perlapi/is_utf8_invariant_string>> |
| 608 | and |
| 609 | C<L<perlapi/is_utf8_invariant_string_loc>>, |
| 610 | |
| 611 | =cut |
| 612 | |
| 613 | */ |
| 614 | |
| 615 | PERL_STATIC_INLINE Size_t |
| 616 | S_variant_under_utf8_count(const U8* const s, const U8* const e) |
| 617 | { |
| 618 | const U8* x = s; |
| 619 | Size_t count = 0; |
| 620 | |
| 621 | PERL_ARGS_ASSERT_VARIANT_UNDER_UTF8_COUNT; |
| 622 | |
| 623 | # ifndef EBCDIC |
| 624 | |
| 625 | /* Test if the string is long enough to use word-at-a-time. (Logic is the |
| 626 | * same as for is_utf8_invariant_string()) */ |
| 627 | if ((STRLEN) (e - x) >= PERL_WORDSIZE |
| 628 | + PERL_WORDSIZE * PERL_IS_SUBWORD_ADDR(x) |
| 629 | - (PTR2nat(x) & PERL_WORD_BOUNDARY_MASK)) |
| 630 | { |
| 631 | |
| 632 | /* Process per-byte until reach word boundary. XXX This loop could be |
| 633 | * eliminated if we knew that this platform had fast unaligned reads */ |
| 634 | while (PTR2nat(x) & PERL_WORD_BOUNDARY_MASK) { |
| 635 | count += ! UTF8_IS_INVARIANT(*x++); |
| 636 | } |
| 637 | |
| 638 | /* Process per-word as long as we have at least a full word left */ |
| 639 | do { /* Commit 03c1e4ab1d6ee9062fb3f94b0ba31db6698724b1 contains an |
| 640 | explanation of how this works */ |
| 641 | count += ((((* (PERL_UINTMAX_T *) x) & PERL_VARIANTS_WORD_MASK) >> 7) |
| 642 | * PERL_COUNT_MULTIPLIER) |
| 643 | >> ((PERL_WORDSIZE - 1) * CHARBITS); |
| 644 | x += PERL_WORDSIZE; |
| 645 | } while (x + PERL_WORDSIZE <= e); |
| 646 | } |
| 647 | |
| 648 | # endif |
| 649 | |
| 650 | /* Process per-byte */ |
| 651 | while (x < e) { |
| 652 | if (! UTF8_IS_INVARIANT(*x)) { |
| 653 | count++; |
| 654 | } |
| 655 | |
| 656 | x++; |
| 657 | } |
| 658 | |
| 659 | return count; |
| 660 | } |
| 661 | |
| 662 | #endif |
| 663 | |
| 664 | #ifndef PERL_IN_REGEXEC_C /* Keep these around for that file */ |
| 665 | # undef PERL_WORDSIZE |
| 666 | # undef PERL_COUNT_MULTIPLIER |
| 667 | # undef PERL_WORD_BOUNDARY_MASK |
| 668 | # undef PERL_VARIANTS_WORD_MASK |
| 669 | #endif |
| 670 | |
| 671 | /* |
| 672 | =for apidoc is_utf8_string |
| 673 | |
| 674 | Returns TRUE if the first C<len> bytes of string C<s> form a valid |
| 675 | Perl-extended-UTF-8 string; returns FALSE otherwise. If C<len> is 0, it will |
| 676 | be calculated using C<strlen(s)> (which means if you use this option, that C<s> |
| 677 | can't have embedded C<NUL> characters and has to have a terminating C<NUL> |
| 678 | byte). Note that all characters being ASCII constitute 'a valid UTF-8 string'. |
| 679 | |
| 680 | This function considers Perl's extended UTF-8 to be valid. That means that |
| 681 | code points above Unicode, surrogates, and non-character code points are |
| 682 | considered valid by this function. Use C<L</is_strict_utf8_string>>, |
| 683 | C<L</is_c9strict_utf8_string>>, or C<L</is_utf8_string_flags>> to restrict what |
| 684 | code points are considered valid. |
| 685 | |
| 686 | See also |
| 687 | C<L</is_utf8_invariant_string>>, |
| 688 | C<L</is_utf8_invariant_string_loc>>, |
| 689 | C<L</is_utf8_string_loc>>, |
| 690 | C<L</is_utf8_string_loclen>>, |
| 691 | C<L</is_utf8_fixed_width_buf_flags>>, |
| 692 | C<L</is_utf8_fixed_width_buf_loc_flags>>, |
| 693 | C<L</is_utf8_fixed_width_buf_loclen_flags>>, |
| 694 | |
| 695 | =cut |
| 696 | */ |
| 697 | |
| 698 | #define is_utf8_string(s, len) is_utf8_string_loclen(s, len, NULL, NULL) |
| 699 | |
| 700 | #if defined(PERL_CORE) || defined (PERL_EXT) |
| 701 | |
| 702 | /* |
| 703 | =for apidoc is_utf8_non_invariant_string |
| 704 | |
| 705 | Returns TRUE if L<perlapi/is_utf8_invariant_string> returns FALSE for the first |
| 706 | C<len> bytes of the string C<s>, but they are, nonetheless, legal Perl-extended |
| 707 | UTF-8; otherwise returns FALSE. |
| 708 | |
| 709 | A TRUE return means that at least one code point represented by the sequence |
| 710 | either is a wide character not representable as a single byte, or the |
| 711 | representation differs depending on whether the sequence is encoded in UTF-8 or |
| 712 | not. |
| 713 | |
| 714 | See also |
| 715 | C<L<perlapi/is_utf8_invariant_string>>, |
| 716 | C<L<perlapi/is_utf8_string>> |
| 717 | |
| 718 | =cut |
| 719 | |
| 720 | This is commonly used to determine if a SV's UTF-8 flag should be turned on. |
| 721 | It generally needn't be if its string is entirely UTF-8 invariant, and it |
| 722 | shouldn't be if it otherwise contains invalid UTF-8. |
| 723 | |
| 724 | It is an internal function because khw thinks that XS code shouldn't be working |
| 725 | at this low a level. A valid use case could change that. |
| 726 | |
| 727 | */ |
| 728 | |
| 729 | PERL_STATIC_INLINE bool |
| 730 | S_is_utf8_non_invariant_string(const U8* const s, STRLEN len) |
| 731 | { |
| 732 | const U8 * first_variant; |
| 733 | |
| 734 | PERL_ARGS_ASSERT_IS_UTF8_NON_INVARIANT_STRING; |
| 735 | |
| 736 | if (is_utf8_invariant_string_loc(s, len, &first_variant)) { |
| 737 | return FALSE; |
| 738 | } |
| 739 | |
| 740 | return is_utf8_string(first_variant, len - (first_variant - s)); |
| 741 | } |
| 742 | |
| 743 | #endif |
| 744 | |
| 745 | /* |
| 746 | =for apidoc is_strict_utf8_string |
| 747 | |
| 748 | Returns TRUE if the first C<len> bytes of string C<s> form a valid |
| 749 | UTF-8-encoded string that is fully interchangeable by any application using |
| 750 | Unicode rules; otherwise it returns FALSE. If C<len> is 0, it will be |
| 751 | calculated using C<strlen(s)> (which means if you use this option, that C<s> |
| 752 | can't have embedded C<NUL> characters and has to have a terminating C<NUL> |
| 753 | byte). Note that all characters being ASCII constitute 'a valid UTF-8 string'. |
| 754 | |
| 755 | This function returns FALSE for strings containing any |
| 756 | code points above the Unicode max of 0x10FFFF, surrogate code points, or |
| 757 | non-character code points. |
| 758 | |
| 759 | See also |
| 760 | C<L</is_utf8_invariant_string>>, |
| 761 | C<L</is_utf8_invariant_string_loc>>, |
| 762 | C<L</is_utf8_string>>, |
| 763 | C<L</is_utf8_string_flags>>, |
| 764 | C<L</is_utf8_string_loc>>, |
| 765 | C<L</is_utf8_string_loc_flags>>, |
| 766 | C<L</is_utf8_string_loclen>>, |
| 767 | C<L</is_utf8_string_loclen_flags>>, |
| 768 | C<L</is_utf8_fixed_width_buf_flags>>, |
| 769 | C<L</is_utf8_fixed_width_buf_loc_flags>>, |
| 770 | C<L</is_utf8_fixed_width_buf_loclen_flags>>, |
| 771 | C<L</is_strict_utf8_string_loc>>, |
| 772 | C<L</is_strict_utf8_string_loclen>>, |
| 773 | C<L</is_c9strict_utf8_string>>, |
| 774 | C<L</is_c9strict_utf8_string_loc>>, |
| 775 | and |
| 776 | C<L</is_c9strict_utf8_string_loclen>>. |
| 777 | |
| 778 | =cut |
| 779 | */ |
| 780 | |
| 781 | #define is_strict_utf8_string(s, len) is_strict_utf8_string_loclen(s, len, NULL, NULL) |
| 782 | |
| 783 | /* |
| 784 | =for apidoc is_c9strict_utf8_string |
| 785 | |
| 786 | Returns TRUE if the first C<len> bytes of string C<s> form a valid |
| 787 | UTF-8-encoded string that conforms to |
| 788 | L<Unicode Corrigendum #9|http://www.unicode.org/versions/corrigendum9.html>; |
| 789 | otherwise it returns FALSE. If C<len> is 0, it will be calculated using |
| 790 | C<strlen(s)> (which means if you use this option, that C<s> can't have embedded |
| 791 | C<NUL> characters and has to have a terminating C<NUL> byte). Note that all |
| 792 | characters being ASCII constitute 'a valid UTF-8 string'. |
| 793 | |
| 794 | This function returns FALSE for strings containing any code points above the |
| 795 | Unicode max of 0x10FFFF or surrogate code points, but accepts non-character |
| 796 | code points per |
| 797 | L<Corrigendum #9|http://www.unicode.org/versions/corrigendum9.html>. |
| 798 | |
| 799 | See also |
| 800 | C<L</is_utf8_invariant_string>>, |
| 801 | C<L</is_utf8_invariant_string_loc>>, |
| 802 | C<L</is_utf8_string>>, |
| 803 | C<L</is_utf8_string_flags>>, |
| 804 | C<L</is_utf8_string_loc>>, |
| 805 | C<L</is_utf8_string_loc_flags>>, |
| 806 | C<L</is_utf8_string_loclen>>, |
| 807 | C<L</is_utf8_string_loclen_flags>>, |
| 808 | C<L</is_utf8_fixed_width_buf_flags>>, |
| 809 | C<L</is_utf8_fixed_width_buf_loc_flags>>, |
| 810 | C<L</is_utf8_fixed_width_buf_loclen_flags>>, |
| 811 | C<L</is_strict_utf8_string>>, |
| 812 | C<L</is_strict_utf8_string_loc>>, |
| 813 | C<L</is_strict_utf8_string_loclen>>, |
| 814 | C<L</is_c9strict_utf8_string_loc>>, |
| 815 | and |
| 816 | C<L</is_c9strict_utf8_string_loclen>>. |
| 817 | |
| 818 | =cut |
| 819 | */ |
| 820 | |
| 821 | #define is_c9strict_utf8_string(s, len) is_c9strict_utf8_string_loclen(s, len, NULL, 0) |
| 822 | |
| 823 | /* |
| 824 | =for apidoc is_utf8_string_flags |
| 825 | |
| 826 | Returns TRUE if the first C<len> bytes of string C<s> form a valid |
| 827 | UTF-8 string, subject to the restrictions imposed by C<flags>; |
| 828 | returns FALSE otherwise. If C<len> is 0, it will be calculated |
| 829 | using C<strlen(s)> (which means if you use this option, that C<s> can't have |
| 830 | embedded C<NUL> characters and has to have a terminating C<NUL> byte). Note |
| 831 | that all characters being ASCII constitute 'a valid UTF-8 string'. |
| 832 | |
| 833 | If C<flags> is 0, this gives the same results as C<L</is_utf8_string>>; if |
| 834 | C<flags> is C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>, this gives the same results |
| 835 | as C<L</is_strict_utf8_string>>; and if C<flags> is |
| 836 | C<UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE>, this gives the same results as |
| 837 | C<L</is_c9strict_utf8_string>>. Otherwise C<flags> may be any |
| 838 | combination of the C<UTF8_DISALLOW_I<foo>> flags understood by |
| 839 | C<L</utf8n_to_uvchr>>, with the same meanings. |
| 840 | |
| 841 | See also |
| 842 | C<L</is_utf8_invariant_string>>, |
| 843 | C<L</is_utf8_invariant_string_loc>>, |
| 844 | C<L</is_utf8_string>>, |
| 845 | C<L</is_utf8_string_loc>>, |
| 846 | C<L</is_utf8_string_loc_flags>>, |
| 847 | C<L</is_utf8_string_loclen>>, |
| 848 | C<L</is_utf8_string_loclen_flags>>, |
| 849 | C<L</is_utf8_fixed_width_buf_flags>>, |
| 850 | C<L</is_utf8_fixed_width_buf_loc_flags>>, |
| 851 | C<L</is_utf8_fixed_width_buf_loclen_flags>>, |
| 852 | C<L</is_strict_utf8_string>>, |
| 853 | C<L</is_strict_utf8_string_loc>>, |
| 854 | C<L</is_strict_utf8_string_loclen>>, |
| 855 | C<L</is_c9strict_utf8_string>>, |
| 856 | C<L</is_c9strict_utf8_string_loc>>, |
| 857 | and |
| 858 | C<L</is_c9strict_utf8_string_loclen>>. |
| 859 | |
| 860 | =cut |
| 861 | */ |
| 862 | |
| 863 | PERL_STATIC_INLINE bool |
| 864 | S_is_utf8_string_flags(const U8 *s, STRLEN len, const U32 flags) |
| 865 | { |
| 866 | const U8 * first_variant; |
| 867 | |
| 868 | PERL_ARGS_ASSERT_IS_UTF8_STRING_FLAGS; |
| 869 | assert(0 == (flags & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE |
| 870 | |UTF8_DISALLOW_PERL_EXTENDED))); |
| 871 | |
| 872 | if (len == 0) { |
| 873 | len = strlen((const char *)s); |
| 874 | } |
| 875 | |
| 876 | if (flags == 0) { |
| 877 | return is_utf8_string(s, len); |
| 878 | } |
| 879 | |
| 880 | if ((flags & ~UTF8_DISALLOW_PERL_EXTENDED) |
| 881 | == UTF8_DISALLOW_ILLEGAL_INTERCHANGE) |
| 882 | { |
| 883 | return is_strict_utf8_string(s, len); |
| 884 | } |
| 885 | |
| 886 | if ((flags & ~UTF8_DISALLOW_PERL_EXTENDED) |
| 887 | == UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE) |
| 888 | { |
| 889 | return is_c9strict_utf8_string(s, len); |
| 890 | } |
| 891 | |
| 892 | if (! is_utf8_invariant_string_loc(s, len, &first_variant)) { |
| 893 | const U8* const send = s + len; |
| 894 | const U8* x = first_variant; |
| 895 | |
| 896 | while (x < send) { |
| 897 | STRLEN cur_len = isUTF8_CHAR_flags(x, send, flags); |
| 898 | if (UNLIKELY(! cur_len)) { |
| 899 | return FALSE; |
| 900 | } |
| 901 | x += cur_len; |
| 902 | } |
| 903 | } |
| 904 | |
| 905 | return TRUE; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | |
| 910 | =for apidoc is_utf8_string_loc |
| 911 | |
| 912 | Like C<L</is_utf8_string>> but stores the location of the failure (in the |
| 913 | case of "utf8ness failure") or the location C<s>+C<len> (in the case of |
| 914 | "utf8ness success") in the C<ep> pointer. |
| 915 | |
| 916 | See also C<L</is_utf8_string_loclen>>. |
| 917 | |
| 918 | =cut |
| 919 | */ |
| 920 | |
| 921 | #define is_utf8_string_loc(s, len, ep) is_utf8_string_loclen(s, len, ep, 0) |
| 922 | |
| 923 | /* |
| 924 | |
| 925 | =for apidoc is_utf8_string_loclen |
| 926 | |
| 927 | Like C<L</is_utf8_string>> but stores the location of the failure (in the |
| 928 | case of "utf8ness failure") or the location C<s>+C<len> (in the case of |
| 929 | "utf8ness success") in the C<ep> pointer, and the number of UTF-8 |
| 930 | encoded characters in the C<el> pointer. |
| 931 | |
| 932 | See also C<L</is_utf8_string_loc>>. |
| 933 | |
| 934 | =cut |
| 935 | */ |
| 936 | |
| 937 | PERL_STATIC_INLINE bool |
| 938 | Perl_is_utf8_string_loclen(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el) |
| 939 | { |
| 940 | const U8 * first_variant; |
| 941 | |
| 942 | PERL_ARGS_ASSERT_IS_UTF8_STRING_LOCLEN; |
| 943 | |
| 944 | if (len == 0) { |
| 945 | len = strlen((const char *) s); |
| 946 | } |
| 947 | |
| 948 | if (is_utf8_invariant_string_loc(s, len, &first_variant)) { |
| 949 | if (el) |
| 950 | *el = len; |
| 951 | |
| 952 | if (ep) { |
| 953 | *ep = s + len; |
| 954 | } |
| 955 | |
| 956 | return TRUE; |
| 957 | } |
| 958 | |
| 959 | { |
| 960 | const U8* const send = s + len; |
| 961 | const U8* x = first_variant; |
| 962 | STRLEN outlen = first_variant - s; |
| 963 | |
| 964 | while (x < send) { |
| 965 | const STRLEN cur_len = isUTF8_CHAR(x, send); |
| 966 | if (UNLIKELY(! cur_len)) { |
| 967 | break; |
| 968 | } |
| 969 | x += cur_len; |
| 970 | outlen++; |
| 971 | } |
| 972 | |
| 973 | if (el) |
| 974 | *el = outlen; |
| 975 | |
| 976 | if (ep) { |
| 977 | *ep = x; |
| 978 | } |
| 979 | |
| 980 | return (x == send); |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | /* |
| 985 | |
| 986 | =for apidoc is_strict_utf8_string_loc |
| 987 | |
| 988 | Like C<L</is_strict_utf8_string>> but stores the location of the failure (in the |
| 989 | case of "utf8ness failure") or the location C<s>+C<len> (in the case of |
| 990 | "utf8ness success") in the C<ep> pointer. |
| 991 | |
| 992 | See also C<L</is_strict_utf8_string_loclen>>. |
| 993 | |
| 994 | =cut |
| 995 | */ |
| 996 | |
| 997 | #define is_strict_utf8_string_loc(s, len, ep) \ |
| 998 | is_strict_utf8_string_loclen(s, len, ep, 0) |
| 999 | |
| 1000 | /* |
| 1001 | |
| 1002 | =for apidoc is_strict_utf8_string_loclen |
| 1003 | |
| 1004 | Like C<L</is_strict_utf8_string>> but stores the location of the failure (in the |
| 1005 | case of "utf8ness failure") or the location C<s>+C<len> (in the case of |
| 1006 | "utf8ness success") in the C<ep> pointer, and the number of UTF-8 |
| 1007 | encoded characters in the C<el> pointer. |
| 1008 | |
| 1009 | See also C<L</is_strict_utf8_string_loc>>. |
| 1010 | |
| 1011 | =cut |
| 1012 | */ |
| 1013 | |
| 1014 | PERL_STATIC_INLINE bool |
| 1015 | S_is_strict_utf8_string_loclen(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el) |
| 1016 | { |
| 1017 | const U8 * first_variant; |
| 1018 | |
| 1019 | PERL_ARGS_ASSERT_IS_STRICT_UTF8_STRING_LOCLEN; |
| 1020 | |
| 1021 | if (len == 0) { |
| 1022 | len = strlen((const char *) s); |
| 1023 | } |
| 1024 | |
| 1025 | if (is_utf8_invariant_string_loc(s, len, &first_variant)) { |
| 1026 | if (el) |
| 1027 | *el = len; |
| 1028 | |
| 1029 | if (ep) { |
| 1030 | *ep = s + len; |
| 1031 | } |
| 1032 | |
| 1033 | return TRUE; |
| 1034 | } |
| 1035 | |
| 1036 | { |
| 1037 | const U8* const send = s + len; |
| 1038 | const U8* x = first_variant; |
| 1039 | STRLEN outlen = first_variant - s; |
| 1040 | |
| 1041 | while (x < send) { |
| 1042 | const STRLEN cur_len = isSTRICT_UTF8_CHAR(x, send); |
| 1043 | if (UNLIKELY(! cur_len)) { |
| 1044 | break; |
| 1045 | } |
| 1046 | x += cur_len; |
| 1047 | outlen++; |
| 1048 | } |
| 1049 | |
| 1050 | if (el) |
| 1051 | *el = outlen; |
| 1052 | |
| 1053 | if (ep) { |
| 1054 | *ep = x; |
| 1055 | } |
| 1056 | |
| 1057 | return (x == send); |
| 1058 | } |
| 1059 | } |
| 1060 | |
| 1061 | /* |
| 1062 | |
| 1063 | =for apidoc is_c9strict_utf8_string_loc |
| 1064 | |
| 1065 | Like C<L</is_c9strict_utf8_string>> but stores the location of the failure (in |
| 1066 | the case of "utf8ness failure") or the location C<s>+C<len> (in the case of |
| 1067 | "utf8ness success") in the C<ep> pointer. |
| 1068 | |
| 1069 | See also C<L</is_c9strict_utf8_string_loclen>>. |
| 1070 | |
| 1071 | =cut |
| 1072 | */ |
| 1073 | |
| 1074 | #define is_c9strict_utf8_string_loc(s, len, ep) \ |
| 1075 | is_c9strict_utf8_string_loclen(s, len, ep, 0) |
| 1076 | |
| 1077 | /* |
| 1078 | |
| 1079 | =for apidoc is_c9strict_utf8_string_loclen |
| 1080 | |
| 1081 | Like C<L</is_c9strict_utf8_string>> but stores the location of the failure (in |
| 1082 | the case of "utf8ness failure") or the location C<s>+C<len> (in the case of |
| 1083 | "utf8ness success") in the C<ep> pointer, and the number of UTF-8 encoded |
| 1084 | characters in the C<el> pointer. |
| 1085 | |
| 1086 | See also C<L</is_c9strict_utf8_string_loc>>. |
| 1087 | |
| 1088 | =cut |
| 1089 | */ |
| 1090 | |
| 1091 | PERL_STATIC_INLINE bool |
| 1092 | S_is_c9strict_utf8_string_loclen(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el) |
| 1093 | { |
| 1094 | const U8 * first_variant; |
| 1095 | |
| 1096 | PERL_ARGS_ASSERT_IS_C9STRICT_UTF8_STRING_LOCLEN; |
| 1097 | |
| 1098 | if (len == 0) { |
| 1099 | len = strlen((const char *) s); |
| 1100 | } |
| 1101 | |
| 1102 | if (is_utf8_invariant_string_loc(s, len, &first_variant)) { |
| 1103 | if (el) |
| 1104 | *el = len; |
| 1105 | |
| 1106 | if (ep) { |
| 1107 | *ep = s + len; |
| 1108 | } |
| 1109 | |
| 1110 | return TRUE; |
| 1111 | } |
| 1112 | |
| 1113 | { |
| 1114 | const U8* const send = s + len; |
| 1115 | const U8* x = first_variant; |
| 1116 | STRLEN outlen = first_variant - s; |
| 1117 | |
| 1118 | while (x < send) { |
| 1119 | const STRLEN cur_len = isC9_STRICT_UTF8_CHAR(x, send); |
| 1120 | if (UNLIKELY(! cur_len)) { |
| 1121 | break; |
| 1122 | } |
| 1123 | x += cur_len; |
| 1124 | outlen++; |
| 1125 | } |
| 1126 | |
| 1127 | if (el) |
| 1128 | *el = outlen; |
| 1129 | |
| 1130 | if (ep) { |
| 1131 | *ep = x; |
| 1132 | } |
| 1133 | |
| 1134 | return (x == send); |
| 1135 | } |
| 1136 | } |
| 1137 | |
| 1138 | /* |
| 1139 | |
| 1140 | =for apidoc is_utf8_string_loc_flags |
| 1141 | |
| 1142 | Like C<L</is_utf8_string_flags>> but stores the location of the failure (in the |
| 1143 | case of "utf8ness failure") or the location C<s>+C<len> (in the case of |
| 1144 | "utf8ness success") in the C<ep> pointer. |
| 1145 | |
| 1146 | See also C<L</is_utf8_string_loclen_flags>>. |
| 1147 | |
| 1148 | =cut |
| 1149 | */ |
| 1150 | |
| 1151 | #define is_utf8_string_loc_flags(s, len, ep, flags) \ |
| 1152 | is_utf8_string_loclen_flags(s, len, ep, 0, flags) |
| 1153 | |
| 1154 | |
| 1155 | /* The above 3 actual functions could have been moved into the more general one |
| 1156 | * just below, and made #defines that call it with the right 'flags'. They are |
| 1157 | * currently kept separate to increase their chances of getting inlined */ |
| 1158 | |
| 1159 | /* |
| 1160 | |
| 1161 | =for apidoc is_utf8_string_loclen_flags |
| 1162 | |
| 1163 | Like C<L</is_utf8_string_flags>> but stores the location of the failure (in the |
| 1164 | case of "utf8ness failure") or the location C<s>+C<len> (in the case of |
| 1165 | "utf8ness success") in the C<ep> pointer, and the number of UTF-8 |
| 1166 | encoded characters in the C<el> pointer. |
| 1167 | |
| 1168 | See also C<L</is_utf8_string_loc_flags>>. |
| 1169 | |
| 1170 | =cut |
| 1171 | */ |
| 1172 | |
| 1173 | PERL_STATIC_INLINE bool |
| 1174 | S_is_utf8_string_loclen_flags(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el, const U32 flags) |
| 1175 | { |
| 1176 | const U8 * first_variant; |
| 1177 | |
| 1178 | PERL_ARGS_ASSERT_IS_UTF8_STRING_LOCLEN_FLAGS; |
| 1179 | assert(0 == (flags & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE |
| 1180 | |UTF8_DISALLOW_PERL_EXTENDED))); |
| 1181 | |
| 1182 | if (len == 0) { |
| 1183 | len = strlen((const char *) s); |
| 1184 | } |
| 1185 | |
| 1186 | if (flags == 0) { |
| 1187 | return is_utf8_string_loclen(s, len, ep, el); |
| 1188 | } |
| 1189 | |
| 1190 | if ((flags & ~UTF8_DISALLOW_PERL_EXTENDED) |
| 1191 | == UTF8_DISALLOW_ILLEGAL_INTERCHANGE) |
| 1192 | { |
| 1193 | return is_strict_utf8_string_loclen(s, len, ep, el); |
| 1194 | } |
| 1195 | |
| 1196 | if ((flags & ~UTF8_DISALLOW_PERL_EXTENDED) |
| 1197 | == UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE) |
| 1198 | { |
| 1199 | return is_c9strict_utf8_string_loclen(s, len, ep, el); |
| 1200 | } |
| 1201 | |
| 1202 | if (is_utf8_invariant_string_loc(s, len, &first_variant)) { |
| 1203 | if (el) |
| 1204 | *el = len; |
| 1205 | |
| 1206 | if (ep) { |
| 1207 | *ep = s + len; |
| 1208 | } |
| 1209 | |
| 1210 | return TRUE; |
| 1211 | } |
| 1212 | |
| 1213 | { |
| 1214 | const U8* send = s + len; |
| 1215 | const U8* x = first_variant; |
| 1216 | STRLEN outlen = first_variant - s; |
| 1217 | |
| 1218 | while (x < send) { |
| 1219 | const STRLEN cur_len = isUTF8_CHAR_flags(x, send, flags); |
| 1220 | if (UNLIKELY(! cur_len)) { |
| 1221 | break; |
| 1222 | } |
| 1223 | x += cur_len; |
| 1224 | outlen++; |
| 1225 | } |
| 1226 | |
| 1227 | if (el) |
| 1228 | *el = outlen; |
| 1229 | |
| 1230 | if (ep) { |
| 1231 | *ep = x; |
| 1232 | } |
| 1233 | |
| 1234 | return (x == send); |
| 1235 | } |
| 1236 | } |
| 1237 | |
| 1238 | /* |
| 1239 | =for apidoc utf8_distance |
| 1240 | |
| 1241 | Returns the number of UTF-8 characters between the UTF-8 pointers C<a> |
| 1242 | and C<b>. |
| 1243 | |
| 1244 | WARNING: use only if you *know* that the pointers point inside the |
| 1245 | same UTF-8 buffer. |
| 1246 | |
| 1247 | =cut |
| 1248 | */ |
| 1249 | |
| 1250 | PERL_STATIC_INLINE IV |
| 1251 | Perl_utf8_distance(pTHX_ const U8 *a, const U8 *b) |
| 1252 | { |
| 1253 | PERL_ARGS_ASSERT_UTF8_DISTANCE; |
| 1254 | |
| 1255 | return (a < b) ? -1 * (IV) utf8_length(a, b) : (IV) utf8_length(b, a); |
| 1256 | } |
| 1257 | |
| 1258 | /* |
| 1259 | =for apidoc utf8_hop |
| 1260 | |
| 1261 | Return the UTF-8 pointer C<s> displaced by C<off> characters, either |
| 1262 | forward or backward. |
| 1263 | |
| 1264 | WARNING: do not use the following unless you *know* C<off> is within |
| 1265 | the UTF-8 data pointed to by C<s> *and* that on entry C<s> is aligned |
| 1266 | on the first byte of character or just after the last byte of a character. |
| 1267 | |
| 1268 | =cut |
| 1269 | */ |
| 1270 | |
| 1271 | PERL_STATIC_INLINE U8 * |
| 1272 | Perl_utf8_hop(const U8 *s, SSize_t off) |
| 1273 | { |
| 1274 | PERL_ARGS_ASSERT_UTF8_HOP; |
| 1275 | |
| 1276 | /* Note: cannot use UTF8_IS_...() too eagerly here since e.g |
| 1277 | * the bitops (especially ~) can create illegal UTF-8. |
| 1278 | * In other words: in Perl UTF-8 is not just for Unicode. */ |
| 1279 | |
| 1280 | if (off >= 0) { |
| 1281 | while (off--) |
| 1282 | s += UTF8SKIP(s); |
| 1283 | } |
| 1284 | else { |
| 1285 | while (off++) { |
| 1286 | s--; |
| 1287 | while (UTF8_IS_CONTINUATION(*s)) |
| 1288 | s--; |
| 1289 | } |
| 1290 | } |
| 1291 | GCC_DIAG_IGNORE_STMT(-Wcast-qual); |
| 1292 | return (U8 *)s; |
| 1293 | GCC_DIAG_RESTORE_STMT; |
| 1294 | } |
| 1295 | |
| 1296 | /* |
| 1297 | =for apidoc utf8_hop_forward |
| 1298 | |
| 1299 | Return the UTF-8 pointer C<s> displaced by up to C<off> characters, |
| 1300 | forward. |
| 1301 | |
| 1302 | C<off> must be non-negative. |
| 1303 | |
| 1304 | C<s> must be before or equal to C<end>. |
| 1305 | |
| 1306 | When moving forward it will not move beyond C<end>. |
| 1307 | |
| 1308 | Will not exceed this limit even if the string is not valid "UTF-8". |
| 1309 | |
| 1310 | =cut |
| 1311 | */ |
| 1312 | |
| 1313 | PERL_STATIC_INLINE U8 * |
| 1314 | Perl_utf8_hop_forward(const U8 *s, SSize_t off, const U8 *end) |
| 1315 | { |
| 1316 | PERL_ARGS_ASSERT_UTF8_HOP_FORWARD; |
| 1317 | |
| 1318 | /* Note: cannot use UTF8_IS_...() too eagerly here since e.g |
| 1319 | * the bitops (especially ~) can create illegal UTF-8. |
| 1320 | * In other words: in Perl UTF-8 is not just for Unicode. */ |
| 1321 | |
| 1322 | assert(s <= end); |
| 1323 | assert(off >= 0); |
| 1324 | |
| 1325 | while (off--) { |
| 1326 | STRLEN skip = UTF8SKIP(s); |
| 1327 | if ((STRLEN)(end - s) <= skip) { |
| 1328 | GCC_DIAG_IGNORE_STMT(-Wcast-qual); |
| 1329 | return (U8 *)end; |
| 1330 | GCC_DIAG_RESTORE_STMT; |
| 1331 | } |
| 1332 | s += skip; |
| 1333 | } |
| 1334 | |
| 1335 | GCC_DIAG_IGNORE_STMT(-Wcast-qual); |
| 1336 | return (U8 *)s; |
| 1337 | GCC_DIAG_RESTORE_STMT; |
| 1338 | } |
| 1339 | |
| 1340 | /* |
| 1341 | =for apidoc utf8_hop_back |
| 1342 | |
| 1343 | Return the UTF-8 pointer C<s> displaced by up to C<off> characters, |
| 1344 | backward. |
| 1345 | |
| 1346 | C<off> must be non-positive. |
| 1347 | |
| 1348 | C<s> must be after or equal to C<start>. |
| 1349 | |
| 1350 | When moving backward it will not move before C<start>. |
| 1351 | |
| 1352 | Will not exceed this limit even if the string is not valid "UTF-8". |
| 1353 | |
| 1354 | =cut |
| 1355 | */ |
| 1356 | |
| 1357 | PERL_STATIC_INLINE U8 * |
| 1358 | Perl_utf8_hop_back(const U8 *s, SSize_t off, const U8 *start) |
| 1359 | { |
| 1360 | PERL_ARGS_ASSERT_UTF8_HOP_BACK; |
| 1361 | |
| 1362 | /* Note: cannot use UTF8_IS_...() too eagerly here since e.g |
| 1363 | * the bitops (especially ~) can create illegal UTF-8. |
| 1364 | * In other words: in Perl UTF-8 is not just for Unicode. */ |
| 1365 | |
| 1366 | assert(start <= s); |
| 1367 | assert(off <= 0); |
| 1368 | |
| 1369 | while (off++ && s > start) { |
| 1370 | s--; |
| 1371 | while (UTF8_IS_CONTINUATION(*s) && s > start) |
| 1372 | s--; |
| 1373 | } |
| 1374 | |
| 1375 | GCC_DIAG_IGNORE_STMT(-Wcast-qual); |
| 1376 | return (U8 *)s; |
| 1377 | GCC_DIAG_RESTORE_STMT; |
| 1378 | } |
| 1379 | |
| 1380 | /* |
| 1381 | =for apidoc utf8_hop_safe |
| 1382 | |
| 1383 | Return the UTF-8 pointer C<s> displaced by up to C<off> characters, |
| 1384 | either forward or backward. |
| 1385 | |
| 1386 | When moving backward it will not move before C<start>. |
| 1387 | |
| 1388 | When moving forward it will not move beyond C<end>. |
| 1389 | |
| 1390 | Will not exceed those limits even if the string is not valid "UTF-8". |
| 1391 | |
| 1392 | =cut |
| 1393 | */ |
| 1394 | |
| 1395 | PERL_STATIC_INLINE U8 * |
| 1396 | Perl_utf8_hop_safe(const U8 *s, SSize_t off, const U8 *start, const U8 *end) |
| 1397 | { |
| 1398 | PERL_ARGS_ASSERT_UTF8_HOP_SAFE; |
| 1399 | |
| 1400 | /* Note: cannot use UTF8_IS_...() too eagerly here since e.g |
| 1401 | * the bitops (especially ~) can create illegal UTF-8. |
| 1402 | * In other words: in Perl UTF-8 is not just for Unicode. */ |
| 1403 | |
| 1404 | assert(start <= s && s <= end); |
| 1405 | |
| 1406 | if (off >= 0) { |
| 1407 | return utf8_hop_forward(s, off, end); |
| 1408 | } |
| 1409 | else { |
| 1410 | return utf8_hop_back(s, off, start); |
| 1411 | } |
| 1412 | } |
| 1413 | |
| 1414 | /* |
| 1415 | |
| 1416 | =for apidoc is_utf8_valid_partial_char |
| 1417 | |
| 1418 | Returns 0 if the sequence of bytes starting at C<s> and looking no further than |
| 1419 | S<C<e - 1>> is the UTF-8 encoding, as extended by Perl, for one or more code |
| 1420 | points. Otherwise, it returns 1 if there exists at least one non-empty |
| 1421 | sequence of bytes that when appended to sequence C<s>, starting at position |
| 1422 | C<e> causes the entire sequence to be the well-formed UTF-8 of some code point; |
| 1423 | otherwise returns 0. |
| 1424 | |
| 1425 | In other words this returns TRUE if C<s> points to a partial UTF-8-encoded code |
| 1426 | point. |
| 1427 | |
| 1428 | This is useful when a fixed-length buffer is being tested for being well-formed |
| 1429 | UTF-8, but the final few bytes in it don't comprise a full character; that is, |
| 1430 | it is split somewhere in the middle of the final code point's UTF-8 |
| 1431 | representation. (Presumably when the buffer is refreshed with the next chunk |
| 1432 | of data, the new first bytes will complete the partial code point.) This |
| 1433 | function is used to verify that the final bytes in the current buffer are in |
| 1434 | fact the legal beginning of some code point, so that if they aren't, the |
| 1435 | failure can be signalled without having to wait for the next read. |
| 1436 | |
| 1437 | =cut |
| 1438 | */ |
| 1439 | #define is_utf8_valid_partial_char(s, e) \ |
| 1440 | is_utf8_valid_partial_char_flags(s, e, 0) |
| 1441 | |
| 1442 | /* |
| 1443 | |
| 1444 | =for apidoc is_utf8_valid_partial_char_flags |
| 1445 | |
| 1446 | Like C<L</is_utf8_valid_partial_char>>, it returns a boolean giving whether |
| 1447 | or not the input is a valid UTF-8 encoded partial character, but it takes an |
| 1448 | extra parameter, C<flags>, which can further restrict which code points are |
| 1449 | considered valid. |
| 1450 | |
| 1451 | If C<flags> is 0, this behaves identically to |
| 1452 | C<L</is_utf8_valid_partial_char>>. Otherwise C<flags> can be any combination |
| 1453 | of the C<UTF8_DISALLOW_I<foo>> flags accepted by C<L</utf8n_to_uvchr>>. If |
| 1454 | there is any sequence of bytes that can complete the input partial character in |
| 1455 | such a way that a non-prohibited character is formed, the function returns |
| 1456 | TRUE; otherwise FALSE. Non character code points cannot be determined based on |
| 1457 | partial character input. But many of the other possible excluded types can be |
| 1458 | determined from just the first one or two bytes. |
| 1459 | |
| 1460 | =cut |
| 1461 | */ |
| 1462 | |
| 1463 | PERL_STATIC_INLINE bool |
| 1464 | S_is_utf8_valid_partial_char_flags(const U8 * const s, const U8 * const e, const U32 flags) |
| 1465 | { |
| 1466 | PERL_ARGS_ASSERT_IS_UTF8_VALID_PARTIAL_CHAR_FLAGS; |
| 1467 | |
| 1468 | assert(0 == (flags & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE |
| 1469 | |UTF8_DISALLOW_PERL_EXTENDED))); |
| 1470 | |
| 1471 | if (s >= e || s + UTF8SKIP(s) <= e) { |
| 1472 | return FALSE; |
| 1473 | } |
| 1474 | |
| 1475 | return cBOOL(_is_utf8_char_helper(s, e, flags)); |
| 1476 | } |
| 1477 | |
| 1478 | /* |
| 1479 | |
| 1480 | =for apidoc is_utf8_fixed_width_buf_flags |
| 1481 | |
| 1482 | Returns TRUE if the fixed-width buffer starting at C<s> with length C<len> |
| 1483 | is entirely valid UTF-8, subject to the restrictions given by C<flags>; |
| 1484 | otherwise it returns FALSE. |
| 1485 | |
| 1486 | If C<flags> is 0, any well-formed UTF-8, as extended by Perl, is accepted |
| 1487 | without restriction. If the final few bytes of the buffer do not form a |
| 1488 | complete code point, this will return TRUE anyway, provided that |
| 1489 | C<L</is_utf8_valid_partial_char_flags>> returns TRUE for them. |
| 1490 | |
| 1491 | If C<flags> in non-zero, it can be any combination of the |
| 1492 | C<UTF8_DISALLOW_I<foo>> flags accepted by C<L</utf8n_to_uvchr>>, and with the |
| 1493 | same meanings. |
| 1494 | |
| 1495 | This function differs from C<L</is_utf8_string_flags>> only in that the latter |
| 1496 | returns FALSE if the final few bytes of the string don't form a complete code |
| 1497 | point. |
| 1498 | |
| 1499 | =cut |
| 1500 | */ |
| 1501 | #define is_utf8_fixed_width_buf_flags(s, len, flags) \ |
| 1502 | is_utf8_fixed_width_buf_loclen_flags(s, len, 0, 0, flags) |
| 1503 | |
| 1504 | /* |
| 1505 | |
| 1506 | =for apidoc is_utf8_fixed_width_buf_loc_flags |
| 1507 | |
| 1508 | Like C<L</is_utf8_fixed_width_buf_flags>> but stores the location of the |
| 1509 | failure in the C<ep> pointer. If the function returns TRUE, C<*ep> will point |
| 1510 | to the beginning of any partial character at the end of the buffer; if there is |
| 1511 | no partial character C<*ep> will contain C<s>+C<len>. |
| 1512 | |
| 1513 | See also C<L</is_utf8_fixed_width_buf_loclen_flags>>. |
| 1514 | |
| 1515 | =cut |
| 1516 | */ |
| 1517 | |
| 1518 | #define is_utf8_fixed_width_buf_loc_flags(s, len, loc, flags) \ |
| 1519 | is_utf8_fixed_width_buf_loclen_flags(s, len, loc, 0, flags) |
| 1520 | |
| 1521 | /* |
| 1522 | |
| 1523 | =for apidoc is_utf8_fixed_width_buf_loclen_flags |
| 1524 | |
| 1525 | Like C<L</is_utf8_fixed_width_buf_loc_flags>> but stores the number of |
| 1526 | complete, valid characters found in the C<el> pointer. |
| 1527 | |
| 1528 | =cut |
| 1529 | */ |
| 1530 | |
| 1531 | PERL_STATIC_INLINE bool |
| 1532 | S_is_utf8_fixed_width_buf_loclen_flags(const U8 * const s, |
| 1533 | STRLEN len, |
| 1534 | const U8 **ep, |
| 1535 | STRLEN *el, |
| 1536 | const U32 flags) |
| 1537 | { |
| 1538 | const U8 * maybe_partial; |
| 1539 | |
| 1540 | PERL_ARGS_ASSERT_IS_UTF8_FIXED_WIDTH_BUF_LOCLEN_FLAGS; |
| 1541 | |
| 1542 | if (! ep) { |
| 1543 | ep = &maybe_partial; |
| 1544 | } |
| 1545 | |
| 1546 | /* If it's entirely valid, return that; otherwise see if the only error is |
| 1547 | * that the final few bytes are for a partial character */ |
| 1548 | return is_utf8_string_loclen_flags(s, len, ep, el, flags) |
| 1549 | || is_utf8_valid_partial_char_flags(*ep, s + len, flags); |
| 1550 | } |
| 1551 | |
| 1552 | /* ------------------------------- perl.h ----------------------------- */ |
| 1553 | |
| 1554 | /* |
| 1555 | =head1 Miscellaneous Functions |
| 1556 | |
| 1557 | =for apidoc AiR|bool|is_safe_syscall|const char *pv|STRLEN len|const char *what|const char *op_name |
| 1558 | |
| 1559 | Test that the given C<pv> doesn't contain any internal C<NUL> characters. |
| 1560 | If it does, set C<errno> to C<ENOENT>, optionally warn, and return FALSE. |
| 1561 | |
| 1562 | Return TRUE if the name is safe. |
| 1563 | |
| 1564 | Used by the C<IS_SAFE_SYSCALL()> macro. |
| 1565 | |
| 1566 | =cut |
| 1567 | */ |
| 1568 | |
| 1569 | PERL_STATIC_INLINE bool |
| 1570 | S_is_safe_syscall(pTHX_ const char *pv, STRLEN len, const char *what, const char *op_name) { |
| 1571 | /* While the Windows CE API provides only UCS-16 (or UTF-16) APIs |
| 1572 | * perl itself uses xce*() functions which accept 8-bit strings. |
| 1573 | */ |
| 1574 | |
| 1575 | PERL_ARGS_ASSERT_IS_SAFE_SYSCALL; |
| 1576 | |
| 1577 | if (len > 1) { |
| 1578 | char *null_at; |
| 1579 | if (UNLIKELY((null_at = (char *)memchr(pv, 0, len-1)) != NULL)) { |
| 1580 | SETERRNO(ENOENT, LIB_INVARG); |
| 1581 | Perl_ck_warner(aTHX_ packWARN(WARN_SYSCALLS), |
| 1582 | "Invalid \\0 character in %s for %s: %s\\0%s", |
| 1583 | what, op_name, pv, null_at+1); |
| 1584 | return FALSE; |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | return TRUE; |
| 1589 | } |
| 1590 | |
| 1591 | /* |
| 1592 | |
| 1593 | Return true if the supplied filename has a newline character |
| 1594 | immediately before the first (hopefully only) NUL. |
| 1595 | |
| 1596 | My original look at this incorrectly used the len from SvPV(), but |
| 1597 | that's incorrect, since we allow for a NUL in pv[len-1]. |
| 1598 | |
| 1599 | So instead, strlen() and work from there. |
| 1600 | |
| 1601 | This allow for the user reading a filename, forgetting to chomp it, |
| 1602 | then calling: |
| 1603 | |
| 1604 | open my $foo, "$file\0"; |
| 1605 | |
| 1606 | */ |
| 1607 | |
| 1608 | #ifdef PERL_CORE |
| 1609 | |
| 1610 | PERL_STATIC_INLINE bool |
| 1611 | S_should_warn_nl(const char *pv) { |
| 1612 | STRLEN len; |
| 1613 | |
| 1614 | PERL_ARGS_ASSERT_SHOULD_WARN_NL; |
| 1615 | |
| 1616 | len = strlen(pv); |
| 1617 | |
| 1618 | return len > 0 && pv[len-1] == '\n'; |
| 1619 | } |
| 1620 | |
| 1621 | #endif |
| 1622 | |
| 1623 | /* ------------------ pp.c, regcomp.c, toke.c, universal.c ------------ */ |
| 1624 | |
| 1625 | #define MAX_CHARSET_NAME_LENGTH 2 |
| 1626 | |
| 1627 | PERL_STATIC_INLINE const char * |
| 1628 | get_regex_charset_name(const U32 flags, STRLEN* const lenp) |
| 1629 | { |
| 1630 | /* Returns a string that corresponds to the name of the regex character set |
| 1631 | * given by 'flags', and *lenp is set the length of that string, which |
| 1632 | * cannot exceed MAX_CHARSET_NAME_LENGTH characters */ |
| 1633 | |
| 1634 | *lenp = 1; |
| 1635 | switch (get_regex_charset(flags)) { |
| 1636 | case REGEX_DEPENDS_CHARSET: return DEPENDS_PAT_MODS; |
| 1637 | case REGEX_LOCALE_CHARSET: return LOCALE_PAT_MODS; |
| 1638 | case REGEX_UNICODE_CHARSET: return UNICODE_PAT_MODS; |
| 1639 | case REGEX_ASCII_RESTRICTED_CHARSET: return ASCII_RESTRICT_PAT_MODS; |
| 1640 | case REGEX_ASCII_MORE_RESTRICTED_CHARSET: |
| 1641 | *lenp = 2; |
| 1642 | return ASCII_MORE_RESTRICT_PAT_MODS; |
| 1643 | } |
| 1644 | /* The NOT_REACHED; hides an assert() which has a rather complex |
| 1645 | * definition in perl.h. */ |
| 1646 | NOT_REACHED; /* NOTREACHED */ |
| 1647 | return "?"; /* Unknown */ |
| 1648 | } |
| 1649 | |
| 1650 | /* |
| 1651 | |
| 1652 | Return false if any get magic is on the SV other than taint magic. |
| 1653 | |
| 1654 | */ |
| 1655 | |
| 1656 | PERL_STATIC_INLINE bool |
| 1657 | S_sv_only_taint_gmagic(SV *sv) { |
| 1658 | MAGIC *mg = SvMAGIC(sv); |
| 1659 | |
| 1660 | PERL_ARGS_ASSERT_SV_ONLY_TAINT_GMAGIC; |
| 1661 | |
| 1662 | while (mg) { |
| 1663 | if (mg->mg_type != PERL_MAGIC_taint |
| 1664 | && !(mg->mg_flags & MGf_GSKIP) |
| 1665 | && mg->mg_virtual->svt_get) { |
| 1666 | return FALSE; |
| 1667 | } |
| 1668 | mg = mg->mg_moremagic; |
| 1669 | } |
| 1670 | |
| 1671 | return TRUE; |
| 1672 | } |
| 1673 | |
| 1674 | /* ------------------ cop.h ------------------------------------------- */ |
| 1675 | |
| 1676 | |
| 1677 | /* Enter a block. Push a new base context and return its address. */ |
| 1678 | |
| 1679 | PERL_STATIC_INLINE PERL_CONTEXT * |
| 1680 | S_cx_pushblock(pTHX_ U8 type, U8 gimme, SV** sp, I32 saveix) |
| 1681 | { |
| 1682 | PERL_CONTEXT * cx; |
| 1683 | |
| 1684 | PERL_ARGS_ASSERT_CX_PUSHBLOCK; |
| 1685 | |
| 1686 | CXINC; |
| 1687 | cx = CX_CUR(); |
| 1688 | cx->cx_type = type; |
| 1689 | cx->blk_gimme = gimme; |
| 1690 | cx->blk_oldsaveix = saveix; |
| 1691 | cx->blk_oldsp = (I32)(sp - PL_stack_base); |
| 1692 | cx->blk_oldcop = PL_curcop; |
| 1693 | cx->blk_oldmarksp = (I32)(PL_markstack_ptr - PL_markstack); |
| 1694 | cx->blk_oldscopesp = PL_scopestack_ix; |
| 1695 | cx->blk_oldpm = PL_curpm; |
| 1696 | cx->blk_old_tmpsfloor = PL_tmps_floor; |
| 1697 | |
| 1698 | PL_tmps_floor = PL_tmps_ix; |
| 1699 | CX_DEBUG(cx, "PUSH"); |
| 1700 | return cx; |
| 1701 | } |
| 1702 | |
| 1703 | |
| 1704 | /* Exit a block (RETURN and LAST). */ |
| 1705 | |
| 1706 | PERL_STATIC_INLINE void |
| 1707 | S_cx_popblock(pTHX_ PERL_CONTEXT *cx) |
| 1708 | { |
| 1709 | PERL_ARGS_ASSERT_CX_POPBLOCK; |
| 1710 | |
| 1711 | CX_DEBUG(cx, "POP"); |
| 1712 | /* these 3 are common to cx_popblock and cx_topblock */ |
| 1713 | PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp; |
| 1714 | PL_scopestack_ix = cx->blk_oldscopesp; |
| 1715 | PL_curpm = cx->blk_oldpm; |
| 1716 | |
| 1717 | /* LEAVE_SCOPE() should have made this true. /(?{})/ cheats |
| 1718 | * and leaves a CX entry lying around for repeated use, so |
| 1719 | * skip for multicall */ \ |
| 1720 | assert( (CxTYPE(cx) == CXt_SUB && CxMULTICALL(cx)) |
| 1721 | || PL_savestack_ix == cx->blk_oldsaveix); |
| 1722 | PL_curcop = cx->blk_oldcop; |
| 1723 | PL_tmps_floor = cx->blk_old_tmpsfloor; |
| 1724 | } |
| 1725 | |
| 1726 | /* Continue a block elsewhere (e.g. NEXT, REDO, GOTO). |
| 1727 | * Whereas cx_popblock() restores the state to the point just before |
| 1728 | * cx_pushblock() was called, cx_topblock() restores it to the point just |
| 1729 | * *after* cx_pushblock() was called. */ |
| 1730 | |
| 1731 | PERL_STATIC_INLINE void |
| 1732 | S_cx_topblock(pTHX_ PERL_CONTEXT *cx) |
| 1733 | { |
| 1734 | PERL_ARGS_ASSERT_CX_TOPBLOCK; |
| 1735 | |
| 1736 | CX_DEBUG(cx, "TOP"); |
| 1737 | /* these 3 are common to cx_popblock and cx_topblock */ |
| 1738 | PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp; |
| 1739 | PL_scopestack_ix = cx->blk_oldscopesp; |
| 1740 | PL_curpm = cx->blk_oldpm; |
| 1741 | |
| 1742 | PL_stack_sp = PL_stack_base + cx->blk_oldsp; |
| 1743 | } |
| 1744 | |
| 1745 | |
| 1746 | PERL_STATIC_INLINE void |
| 1747 | S_cx_pushsub(pTHX_ PERL_CONTEXT *cx, CV *cv, OP *retop, bool hasargs) |
| 1748 | { |
| 1749 | U8 phlags = CX_PUSHSUB_GET_LVALUE_MASK(Perl_was_lvalue_sub); |
| 1750 | |
| 1751 | PERL_ARGS_ASSERT_CX_PUSHSUB; |
| 1752 | |
| 1753 | PERL_DTRACE_PROBE_ENTRY(cv); |
| 1754 | cx->blk_sub.cv = cv; |
| 1755 | cx->blk_sub.olddepth = CvDEPTH(cv); |
| 1756 | cx->blk_sub.prevcomppad = PL_comppad; |
| 1757 | cx->cx_type |= (hasargs) ? CXp_HASARGS : 0; |
| 1758 | cx->blk_sub.retop = retop; |
| 1759 | SvREFCNT_inc_simple_void_NN(cv); |
| 1760 | cx->blk_u16 = PL_op->op_private & (phlags|OPpDEREF); |
| 1761 | } |
| 1762 | |
| 1763 | |
| 1764 | /* subsets of cx_popsub() */ |
| 1765 | |
| 1766 | PERL_STATIC_INLINE void |
| 1767 | S_cx_popsub_common(pTHX_ PERL_CONTEXT *cx) |
| 1768 | { |
| 1769 | CV *cv; |
| 1770 | |
| 1771 | PERL_ARGS_ASSERT_CX_POPSUB_COMMON; |
| 1772 | assert(CxTYPE(cx) == CXt_SUB); |
| 1773 | |
| 1774 | PL_comppad = cx->blk_sub.prevcomppad; |
| 1775 | PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL; |
| 1776 | cv = cx->blk_sub.cv; |
| 1777 | CvDEPTH(cv) = cx->blk_sub.olddepth; |
| 1778 | cx->blk_sub.cv = NULL; |
| 1779 | SvREFCNT_dec(cv); |
| 1780 | } |
| 1781 | |
| 1782 | |
| 1783 | /* handle the @_ part of leaving a sub */ |
| 1784 | |
| 1785 | PERL_STATIC_INLINE void |
| 1786 | S_cx_popsub_args(pTHX_ PERL_CONTEXT *cx) |
| 1787 | { |
| 1788 | AV *av; |
| 1789 | |
| 1790 | PERL_ARGS_ASSERT_CX_POPSUB_ARGS; |
| 1791 | assert(CxTYPE(cx) == CXt_SUB); |
| 1792 | assert(AvARRAY(MUTABLE_AV( |
| 1793 | PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[ |
| 1794 | CvDEPTH(cx->blk_sub.cv)])) == PL_curpad); |
| 1795 | |
| 1796 | CX_POP_SAVEARRAY(cx); |
| 1797 | av = MUTABLE_AV(PAD_SVl(0)); |
| 1798 | if (UNLIKELY(AvREAL(av))) |
| 1799 | /* abandon @_ if it got reified */ |
| 1800 | clear_defarray(av, 0); |
| 1801 | else { |
| 1802 | CLEAR_ARGARRAY(av); |
| 1803 | } |
| 1804 | } |
| 1805 | |
| 1806 | |
| 1807 | PERL_STATIC_INLINE void |
| 1808 | S_cx_popsub(pTHX_ PERL_CONTEXT *cx) |
| 1809 | { |
| 1810 | PERL_ARGS_ASSERT_CX_POPSUB; |
| 1811 | assert(CxTYPE(cx) == CXt_SUB); |
| 1812 | |
| 1813 | PERL_DTRACE_PROBE_RETURN(cx->blk_sub.cv); |
| 1814 | |
| 1815 | if (CxHASARGS(cx)) |
| 1816 | cx_popsub_args(cx); |
| 1817 | cx_popsub_common(cx); |
| 1818 | } |
| 1819 | |
| 1820 | |
| 1821 | PERL_STATIC_INLINE void |
| 1822 | S_cx_pushformat(pTHX_ PERL_CONTEXT *cx, CV *cv, OP *retop, GV *gv) |
| 1823 | { |
| 1824 | PERL_ARGS_ASSERT_CX_PUSHFORMAT; |
| 1825 | |
| 1826 | cx->blk_format.cv = cv; |
| 1827 | cx->blk_format.retop = retop; |
| 1828 | cx->blk_format.gv = gv; |
| 1829 | cx->blk_format.dfoutgv = PL_defoutgv; |
| 1830 | cx->blk_format.prevcomppad = PL_comppad; |
| 1831 | cx->blk_u16 = 0; |
| 1832 | |
| 1833 | SvREFCNT_inc_simple_void_NN(cv); |
| 1834 | CvDEPTH(cv)++; |
| 1835 | SvREFCNT_inc_void(cx->blk_format.dfoutgv); |
| 1836 | } |
| 1837 | |
| 1838 | |
| 1839 | PERL_STATIC_INLINE void |
| 1840 | S_cx_popformat(pTHX_ PERL_CONTEXT *cx) |
| 1841 | { |
| 1842 | CV *cv; |
| 1843 | GV *dfout; |
| 1844 | |
| 1845 | PERL_ARGS_ASSERT_CX_POPFORMAT; |
| 1846 | assert(CxTYPE(cx) == CXt_FORMAT); |
| 1847 | |
| 1848 | dfout = cx->blk_format.dfoutgv; |
| 1849 | setdefout(dfout); |
| 1850 | cx->blk_format.dfoutgv = NULL; |
| 1851 | SvREFCNT_dec_NN(dfout); |
| 1852 | |
| 1853 | PL_comppad = cx->blk_format.prevcomppad; |
| 1854 | PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL; |
| 1855 | cv = cx->blk_format.cv; |
| 1856 | cx->blk_format.cv = NULL; |
| 1857 | --CvDEPTH(cv); |
| 1858 | SvREFCNT_dec_NN(cv); |
| 1859 | } |
| 1860 | |
| 1861 | |
| 1862 | PERL_STATIC_INLINE void |
| 1863 | S_cx_pusheval(pTHX_ PERL_CONTEXT *cx, OP *retop, SV *namesv) |
| 1864 | { |
| 1865 | PERL_ARGS_ASSERT_CX_PUSHEVAL; |
| 1866 | |
| 1867 | cx->blk_eval.retop = retop; |
| 1868 | cx->blk_eval.old_namesv = namesv; |
| 1869 | cx->blk_eval.old_eval_root = PL_eval_root; |
| 1870 | cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL; |
| 1871 | cx->blk_eval.cv = NULL; /* later set by doeval_compile() */ |
| 1872 | cx->blk_eval.cur_top_env = PL_top_env; |
| 1873 | |
| 1874 | assert(!(PL_in_eval & ~ 0x3F)); |
| 1875 | assert(!(PL_op->op_type & ~0x1FF)); |
| 1876 | cx->blk_u16 = (PL_in_eval & 0x3F) | ((U16)PL_op->op_type << 7); |
| 1877 | } |
| 1878 | |
| 1879 | |
| 1880 | PERL_STATIC_INLINE void |
| 1881 | S_cx_popeval(pTHX_ PERL_CONTEXT *cx) |
| 1882 | { |
| 1883 | SV *sv; |
| 1884 | |
| 1885 | PERL_ARGS_ASSERT_CX_POPEVAL; |
| 1886 | assert(CxTYPE(cx) == CXt_EVAL); |
| 1887 | |
| 1888 | PL_in_eval = CxOLD_IN_EVAL(cx); |
| 1889 | assert(!(PL_in_eval & 0xc0)); |
| 1890 | PL_eval_root = cx->blk_eval.old_eval_root; |
| 1891 | sv = cx->blk_eval.cur_text; |
| 1892 | if (sv && CxEVAL_TXT_REFCNTED(cx)) { |
| 1893 | cx->blk_eval.cur_text = NULL; |
| 1894 | SvREFCNT_dec_NN(sv); |
| 1895 | } |
| 1896 | |
| 1897 | sv = cx->blk_eval.old_namesv; |
| 1898 | if (sv) { |
| 1899 | cx->blk_eval.old_namesv = NULL; |
| 1900 | SvREFCNT_dec_NN(sv); |
| 1901 | } |
| 1902 | } |
| 1903 | |
| 1904 | |
| 1905 | /* push a plain loop, i.e. |
| 1906 | * { block } |
| 1907 | * while (cond) { block } |
| 1908 | * for (init;cond;continue) { block } |
| 1909 | * This loop can be last/redo'ed etc. |
| 1910 | */ |
| 1911 | |
| 1912 | PERL_STATIC_INLINE void |
| 1913 | S_cx_pushloop_plain(pTHX_ PERL_CONTEXT *cx) |
| 1914 | { |
| 1915 | PERL_ARGS_ASSERT_CX_PUSHLOOP_PLAIN; |
| 1916 | cx->blk_loop.my_op = cLOOP; |
| 1917 | } |
| 1918 | |
| 1919 | |
| 1920 | /* push a true for loop, i.e. |
| 1921 | * for var (list) { block } |
| 1922 | */ |
| 1923 | |
| 1924 | PERL_STATIC_INLINE void |
| 1925 | S_cx_pushloop_for(pTHX_ PERL_CONTEXT *cx, void *itervarp, SV* itersave) |
| 1926 | { |
| 1927 | PERL_ARGS_ASSERT_CX_PUSHLOOP_FOR; |
| 1928 | |
| 1929 | /* this one line is common with cx_pushloop_plain */ |
| 1930 | cx->blk_loop.my_op = cLOOP; |
| 1931 | |
| 1932 | cx->blk_loop.itervar_u.svp = (SV**)itervarp; |
| 1933 | cx->blk_loop.itersave = itersave; |
| 1934 | #ifdef USE_ITHREADS |
| 1935 | cx->blk_loop.oldcomppad = PL_comppad; |
| 1936 | #endif |
| 1937 | } |
| 1938 | |
| 1939 | |
| 1940 | /* pop all loop types, including plain */ |
| 1941 | |
| 1942 | PERL_STATIC_INLINE void |
| 1943 | S_cx_poploop(pTHX_ PERL_CONTEXT *cx) |
| 1944 | { |
| 1945 | PERL_ARGS_ASSERT_CX_POPLOOP; |
| 1946 | |
| 1947 | assert(CxTYPE_is_LOOP(cx)); |
| 1948 | if ( CxTYPE(cx) == CXt_LOOP_ARY |
| 1949 | || CxTYPE(cx) == CXt_LOOP_LAZYSV) |
| 1950 | { |
| 1951 | /* Free ary or cur. This assumes that state_u.ary.ary |
| 1952 | * aligns with state_u.lazysv.cur. See cx_dup() */ |
| 1953 | SV *sv = cx->blk_loop.state_u.lazysv.cur; |
| 1954 | cx->blk_loop.state_u.lazysv.cur = NULL; |
| 1955 | SvREFCNT_dec_NN(sv); |
| 1956 | if (CxTYPE(cx) == CXt_LOOP_LAZYSV) { |
| 1957 | sv = cx->blk_loop.state_u.lazysv.end; |
| 1958 | cx->blk_loop.state_u.lazysv.end = NULL; |
| 1959 | SvREFCNT_dec_NN(sv); |
| 1960 | } |
| 1961 | } |
| 1962 | if (cx->cx_type & (CXp_FOR_PAD|CXp_FOR_GV)) { |
| 1963 | SV *cursv; |
| 1964 | SV **svp = (cx)->blk_loop.itervar_u.svp; |
| 1965 | if ((cx->cx_type & CXp_FOR_GV)) |
| 1966 | svp = &GvSV((GV*)svp); |
| 1967 | cursv = *svp; |
| 1968 | *svp = cx->blk_loop.itersave; |
| 1969 | cx->blk_loop.itersave = NULL; |
| 1970 | SvREFCNT_dec(cursv); |
| 1971 | } |
| 1972 | } |
| 1973 | |
| 1974 | |
| 1975 | PERL_STATIC_INLINE void |
| 1976 | S_cx_pushwhen(pTHX_ PERL_CONTEXT *cx) |
| 1977 | { |
| 1978 | PERL_ARGS_ASSERT_CX_PUSHWHEN; |
| 1979 | |
| 1980 | cx->blk_givwhen.leave_op = cLOGOP->op_other; |
| 1981 | } |
| 1982 | |
| 1983 | |
| 1984 | PERL_STATIC_INLINE void |
| 1985 | S_cx_popwhen(pTHX_ PERL_CONTEXT *cx) |
| 1986 | { |
| 1987 | PERL_ARGS_ASSERT_CX_POPWHEN; |
| 1988 | assert(CxTYPE(cx) == CXt_WHEN); |
| 1989 | |
| 1990 | PERL_UNUSED_ARG(cx); |
| 1991 | PERL_UNUSED_CONTEXT; |
| 1992 | /* currently NOOP */ |
| 1993 | } |
| 1994 | |
| 1995 | |
| 1996 | PERL_STATIC_INLINE void |
| 1997 | S_cx_pushgiven(pTHX_ PERL_CONTEXT *cx, SV *orig_defsv) |
| 1998 | { |
| 1999 | PERL_ARGS_ASSERT_CX_PUSHGIVEN; |
| 2000 | |
| 2001 | cx->blk_givwhen.leave_op = cLOGOP->op_other; |
| 2002 | cx->blk_givwhen.defsv_save = orig_defsv; |
| 2003 | } |
| 2004 | |
| 2005 | |
| 2006 | PERL_STATIC_INLINE void |
| 2007 | S_cx_popgiven(pTHX_ PERL_CONTEXT *cx) |
| 2008 | { |
| 2009 | SV *sv; |
| 2010 | |
| 2011 | PERL_ARGS_ASSERT_CX_POPGIVEN; |
| 2012 | assert(CxTYPE(cx) == CXt_GIVEN); |
| 2013 | |
| 2014 | sv = GvSV(PL_defgv); |
| 2015 | GvSV(PL_defgv) = cx->blk_givwhen.defsv_save; |
| 2016 | cx->blk_givwhen.defsv_save = NULL; |
| 2017 | SvREFCNT_dec(sv); |
| 2018 | } |
| 2019 | |
| 2020 | /* ------------------ util.h ------------------------------------------- */ |
| 2021 | |
| 2022 | /* |
| 2023 | =head1 Miscellaneous Functions |
| 2024 | |
| 2025 | =for apidoc foldEQ |
| 2026 | |
| 2027 | Returns true if the leading C<len> bytes of the strings C<s1> and C<s2> are the |
| 2028 | same |
| 2029 | case-insensitively; false otherwise. Uppercase and lowercase ASCII range bytes |
| 2030 | match themselves and their opposite case counterparts. Non-cased and non-ASCII |
| 2031 | range bytes match only themselves. |
| 2032 | |
| 2033 | =cut |
| 2034 | */ |
| 2035 | |
| 2036 | PERL_STATIC_INLINE I32 |
| 2037 | Perl_foldEQ(const char *s1, const char *s2, I32 len) |
| 2038 | { |
| 2039 | const U8 *a = (const U8 *)s1; |
| 2040 | const U8 *b = (const U8 *)s2; |
| 2041 | |
| 2042 | PERL_ARGS_ASSERT_FOLDEQ; |
| 2043 | |
| 2044 | assert(len >= 0); |
| 2045 | |
| 2046 | while (len--) { |
| 2047 | if (*a != *b && *a != PL_fold[*b]) |
| 2048 | return 0; |
| 2049 | a++,b++; |
| 2050 | } |
| 2051 | return 1; |
| 2052 | } |
| 2053 | |
| 2054 | PERL_STATIC_INLINE I32 |
| 2055 | Perl_foldEQ_latin1(const char *s1, const char *s2, I32 len) |
| 2056 | { |
| 2057 | /* Compare non-utf8 using Unicode (Latin1) semantics. Does not work on |
| 2058 | * MICRO_SIGN, LATIN_SMALL_LETTER_SHARP_S, nor |
| 2059 | * LATIN_SMALL_LETTER_Y_WITH_DIAERESIS, and does not check for these. Nor |
| 2060 | * does it check that the strings each have at least 'len' characters */ |
| 2061 | |
| 2062 | const U8 *a = (const U8 *)s1; |
| 2063 | const U8 *b = (const U8 *)s2; |
| 2064 | |
| 2065 | PERL_ARGS_ASSERT_FOLDEQ_LATIN1; |
| 2066 | |
| 2067 | assert(len >= 0); |
| 2068 | |
| 2069 | while (len--) { |
| 2070 | if (*a != *b && *a != PL_fold_latin1[*b]) { |
| 2071 | return 0; |
| 2072 | } |
| 2073 | a++, b++; |
| 2074 | } |
| 2075 | return 1; |
| 2076 | } |
| 2077 | |
| 2078 | /* |
| 2079 | =for apidoc foldEQ_locale |
| 2080 | |
| 2081 | Returns true if the leading C<len> bytes of the strings C<s1> and C<s2> are the |
| 2082 | same case-insensitively in the current locale; false otherwise. |
| 2083 | |
| 2084 | =cut |
| 2085 | */ |
| 2086 | |
| 2087 | PERL_STATIC_INLINE I32 |
| 2088 | Perl_foldEQ_locale(const char *s1, const char *s2, I32 len) |
| 2089 | { |
| 2090 | dVAR; |
| 2091 | const U8 *a = (const U8 *)s1; |
| 2092 | const U8 *b = (const U8 *)s2; |
| 2093 | |
| 2094 | PERL_ARGS_ASSERT_FOLDEQ_LOCALE; |
| 2095 | |
| 2096 | assert(len >= 0); |
| 2097 | |
| 2098 | while (len--) { |
| 2099 | if (*a != *b && *a != PL_fold_locale[*b]) |
| 2100 | return 0; |
| 2101 | a++,b++; |
| 2102 | } |
| 2103 | return 1; |
| 2104 | } |
| 2105 | |
| 2106 | #if ! defined (HAS_MEMRCHR) && (defined(PERL_CORE) || defined(PERL_EXT)) |
| 2107 | |
| 2108 | PERL_STATIC_INLINE void * |
| 2109 | S_my_memrchr(const char * s, const char c, const STRLEN len) |
| 2110 | { |
| 2111 | /* memrchr(), since many platforms lack it */ |
| 2112 | |
| 2113 | const char * t = s + len - 1; |
| 2114 | |
| 2115 | PERL_ARGS_ASSERT_MY_MEMRCHR; |
| 2116 | |
| 2117 | while (t >= s) { |
| 2118 | if (*t == c) { |
| 2119 | return (void *) t; |
| 2120 | } |
| 2121 | t--; |
| 2122 | } |
| 2123 | |
| 2124 | return NULL; |
| 2125 | } |
| 2126 | |
| 2127 | #endif |
| 2128 | |
| 2129 | /* |
| 2130 | * ex: set ts=8 sts=4 sw=4 et: |
| 2131 | */ |