3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
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.
12 * 'So that was the job I felt I had to do when I started,' thought Sam.
14 * [p.934 of _The Lord of the Rings_, VI/iii: "Mount Doom"]
17 /* This file contains some common functions needed to carry out certain
18 * ops. For example, both pp_sprintf() and pp_prtf() call the function
19 * do_sprintf() found in this file.
23 #define PERL_IN_DOOP_C
25 #include "invlist_inline.h"
32 /* Helper function for do_trans().
33 * Handles cases where the search and replacement charlists aren't UTF-8,
34 * aren't identical, and neither the /d nor /s flag is present.
36 * sv may or may not be utf8. Note that no code point above 255 can possibly
37 * be in the to-translate set
41 S_do_trans_simple(pTHX_ SV * const sv, const OPtrans_map * const tbl)
45 U8 *s = (U8*)SvPV_nomg(sv,len);
46 U8 * const send = s+len;
48 PERL_ARGS_ASSERT_DO_TRANS_SIMPLE;
49 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: entering do_trans_simple:"
54 /* First, take care of non-UTF-8 input strings, because they're easy */
57 const short ch = tbl->map[*s];
67 const bool grows = cBOOL(PL_op->op_private & OPpTRANS_GROWS);
71 /* Allow for worst-case expansion: Each input byte can become 2. For a
72 * given input character, this happens when it occupies a single byte
73 * under UTF-8, but is to be translated to something that occupies two:
74 * $_="a".chr(400); tr/a/\xFE/, FE needs encoding. */
84 /* Need to check this, otherwise 128..255 won't match */
85 const UV c = utf8n_to_uvchr(s, send - s, &ulen, UTF8_ALLOW_DEFAULT);
86 if (c < 0x100 && (ch = tbl->map[c]) >= 0) {
88 d = uvchr_to_utf8(d, (UV)ch);
91 else { /* No match -> copy */
98 sv_setpvn(sv, (char*)dstart, d - dstart);
103 SvCUR_set(sv, d - dstart);
108 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: returning %zu\n",
109 __FILE__, __LINE__, matches));
110 DEBUG_y(sv_dump(sv));
115 /* Helper function for do_trans().
116 * Handles cases where the search and replacement charlists are identical and
117 * non-utf8: so the string isn't modified, and only a count of modifiable
120 * Note that it doesn't handle /d or /s, since these modify the string even if
121 * the replacement list is empty.
123 * sv may or may not be utf8. Note that no code point above 255 can possibly
124 * be in the to-translate set
128 S_do_trans_count(pTHX_ SV * const sv, const OPtrans_map * const tbl)
131 const U8 *s = (const U8*)SvPV_nomg_const(sv, len);
132 const U8 * const send = s + len;
135 PERL_ARGS_ASSERT_DO_TRANS_COUNT;
137 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: entering do_trans_count:"
139 __FILE__, __LINE__));
140 DEBUG_y(sv_dump(sv));
144 if (tbl->map[*s++] >= 0)
149 const bool complement = cBOOL(PL_op->op_private & OPpTRANS_COMPLEMENT);
152 const UV c = utf8n_to_uvchr(s, send - s, &ulen, UTF8_ALLOW_DEFAULT);
154 if (tbl->map[c] >= 0)
156 } else if (complement)
162 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: count returning %zu\n",
163 __FILE__, __LINE__, matches));
168 /* Helper function for do_trans().
169 * Handles cases where the search and replacement charlists aren't identical
170 * and both are non-utf8, and one or both of /d, /s is specified.
172 * sv may or may not be utf8. Note that no code point above 255 can possibly
173 * be in the to-translate set
177 S_do_trans_complex(pTHX_ SV * const sv, const OPtrans_map * const tbl)
180 U8 *s = (U8*)SvPV_nomg(sv, len);
181 U8 * const send = s+len;
183 const bool complement = cBOOL(PL_op->op_private & OPpTRANS_COMPLEMENT);
185 PERL_ARGS_ASSERT_DO_TRANS_COMPLEX;
187 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: entering do_trans_complex:"
189 __FILE__, __LINE__));
190 DEBUG_y(sv_dump(sv));
194 U8 * const dstart = d;
196 if (PL_op->op_private & OPpTRANS_SQUASH) {
198 /* What the mapping of the previous character was to. If the new
199 * character has the same mapping, it is squashed from the output
200 * (but still is included in the count) */
201 short previous_map = (short) TR_OOB;
204 const short this_map = tbl->map[*s];
207 if (this_map != previous_map) {
209 previous_map = this_map;
213 if (this_map == (short) TR_UNMAPPED) {
215 previous_map = (short) TR_OOB;
218 assert(this_map == (short) TR_DELETE);
226 else { /* Not to squash */
228 const short this_map = tbl->map[*s];
233 else if (this_map == (short) TR_UNMAPPED)
235 else if (this_map == (short) TR_DELETE)
241 SvCUR_set(sv, d - dstart);
244 const bool squash = cBOOL(PL_op->op_private & OPpTRANS_SQUASH);
245 const bool grows = cBOOL(PL_op->op_private & OPpTRANS_GROWS);
248 Size_t size = tbl->size;
250 /* What the mapping of the previous character was to. If the new
251 * character has the same mapping, it is squashed from the output (but
252 * still is included in the count) */
256 /* Allow for worst-case expansion: Each input byte can become 2.
257 * For a given input character, this happens when it occupies a
258 * single byte under UTF-8, but is to be translated to something
259 * that occupies two: */
260 Newx(d, len*2+1, U8);
267 const UV comp = utf8n_to_uvchr(s, send - s, &len,
275 ? (short) TR_UNMAPPED
282 if (LIKELY(!squash || ch != pch)) {
283 d = uvchr_to_utf8(d, ch);
289 else if (sch == (short) TR_UNMAPPED) {
294 else if (sch == (short) TR_DELETE)
297 assert(sch == (short) TR_R_EMPTY); /* empty replacement */
306 sv_setpvn(sv, (char*)dstart, d - dstart);
311 SvCUR_set(sv, d - dstart);
316 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: returning %zu\n",
317 __FILE__, __LINE__, matches));
318 DEBUG_y(sv_dump(sv));
323 /* Helper function for do_trans().
324 * Handles cases where an inversion map implementation is to be used and the
325 * search and replacement charlists are identical: so the string isn't
326 * modified, and only a count of modifiable chars is needed.
328 * Note that it doesn't handle /d nor /s, since these modify the string
329 * even if the replacement charlist is empty.
331 * sv may or may not be utf8.
335 S_do_trans_count_invmap(pTHX_ SV * const sv, AV * const invmap)
341 SV** const from_invlist_ptr = av_fetch(invmap, 0, TRUE);
342 SV** const to_invmap_ptr = av_fetch(invmap, 1, TRUE);
343 SV* from_invlist = *from_invlist_ptr;
344 SV* to_invmap_sv = *to_invmap_ptr;
345 UV* map = (UV *) SvPVX(to_invmap_sv);
347 PERL_ARGS_ASSERT_DO_TRANS_COUNT_INVMAP;
349 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d:"
350 "entering do_trans_count_invmap:"
352 __FILE__, __LINE__));
353 DEBUG_y(sv_dump(sv));
354 DEBUG_y(PerlIO_printf(Perl_debug_log, "mapping:\n"));
355 DEBUG_y(invmap_dump(from_invlist, (UV *) SvPVX(to_invmap_sv)));
357 s = (U8*)SvPV_nomg(sv, len);
366 /* Get the code point of the next character in the string */
367 if (! SvUTF8(sv) || UTF8_IS_INVARIANT(*s)) {
372 from = utf8_to_uvchr_buf(s, send, &s_len);
373 if (from == 0 && *s != '\0') {
374 _force_out_malformed_utf8_message(s, send, 0, /*die*/TRUE);
378 /* Look the code point up in the data structure for this tr/// to get
380 i = _invlist_search(from_invlist, from);
383 if (map[i] != (UV) TR_UNLISTED) {
390 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: returning %zu\n",
391 __FILE__, __LINE__, matches));
395 /* Helper function for do_trans().
396 * Handles cases where an inversion map implementation is to be used and the
397 * search and replacement charlists are either not identical or flags are
400 * sv may or may not be utf8.
404 S_do_trans_invmap(pTHX_ SV * const sv, AV * const invmap)
413 SV** const from_invlist_ptr = av_fetch(invmap, 0, TRUE);
414 SV** const to_invmap_ptr = av_fetch(invmap, 1, TRUE);
415 SV** const to_expansion_ptr = av_fetch(invmap, 2, TRUE);
416 NV max_expansion = SvNV(*to_expansion_ptr);
417 SV* from_invlist = *from_invlist_ptr;
418 SV* to_invmap_sv = *to_invmap_ptr;
419 UV* map = (UV *) SvPVX(to_invmap_sv);
420 UV previous_map = TR_OOB;
421 const bool squash = cBOOL(PL_op->op_private & OPpTRANS_SQUASH);
422 const bool delete_unfound = cBOOL(PL_op->op_private & OPpTRANS_DELETE);
423 bool inplace = ! cBOOL(PL_op->op_private & OPpTRANS_GROWS);
424 const UV* from_array = invlist_array(from_invlist);
425 UV final_map = TR_OOB;
426 bool out_is_utf8 = cBOOL(SvUTF8(sv));
429 PERL_ARGS_ASSERT_DO_TRANS_INVMAP;
431 /* A third element in the array indicates that the replacement list was
432 * shorter than the search list, and this element contains the value to use
433 * for the items that don't correspond */
434 if (av_top_index(invmap) >= 3) {
435 SV** const final_map_ptr = av_fetch(invmap, 3, TRUE);
436 SV* const final_map_sv = *final_map_ptr;
437 final_map = SvUV(final_map_sv);
440 /* If there is something in the transliteration that could force the input
441 * to be changed to UTF-8, we don't know if we can do it in place, so
443 if (! out_is_utf8 && (PL_op->op_private & OPpTRANS_CAN_FORCE_UTF8)) {
447 s = (U8*)SvPV_nomg(sv, len);
448 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: entering do_trans_invmap:"
450 __FILE__, __LINE__));
451 DEBUG_y(sv_dump(sv));
452 DEBUG_y(PerlIO_printf(Perl_debug_log, "mapping:\n"));
453 DEBUG_y(invmap_dump(from_invlist, map));
458 /* We know by now if there are some possible input strings whose
459 * transliterations are longer than the input. If none can, we just edit
465 /* Here, we can't edit in place. We have no idea how much, if any,
466 * this particular input string will grow. However, the compilation
467 * calculated the maximum expansion possible. Use that to allocate
468 * based on the worst case scenario. (First +1 is to round up; 2nd is
470 Newx(d, (STRLEN) (len * max_expansion + 1 + 1), U8);
476 /* Do the actual transliteration */
483 /* Get the code point of the next character in the string */
484 if (! SvUTF8(sv) || UTF8_IS_INVARIANT(*s)) {
489 from = utf8_to_uvchr_buf(s, send, &s_len);
490 if (from == 0 && *s != '\0') {
491 _force_out_malformed_utf8_message(s, send, 0, /*die*/TRUE);
495 /* Look the code point up in the data structure for this tr/// to get
497 i = _invlist_search(from_invlist, from);
502 if (to == (UV) TR_UNLISTED) { /* Just copy the unreplaced character */
503 if (UVCHR_IS_INVARIANT(from) || ! out_is_utf8) {
506 else if (SvUTF8(sv)) {
507 Move(s, d, s_len, U8);
510 else { /* Convert to UTF-8 */
511 append_utf8_from_native_byte(*s, &d);
519 /* Everything else is counted as a match */
522 if (to == (UV) TR_SPECIAL_HANDLING) {
523 if (delete_unfound) {
528 /* Use the final character in the replacement list */
531 else { /* Here the input code point is to be remapped. The actual
532 value is offset from the base of this entry */
533 to += from - from_array[i];
536 /* If copying all occurrences, or this is the first occurrence, copy it
538 if (! squash || to != previous_map) {
540 d = uvchr_to_utf8(d, to);
543 if (to >= 256) { /* If need to convert to UTF-8, restart */
561 sv_setpvn(sv, (char*)d0, d - d0);
566 SvCUR_set(sv, d - d0);
569 if (! SvUTF8(sv) && out_is_utf8) {
574 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: returning %zu\n",
575 __FILE__, __LINE__, matches));
576 DEBUG_y(sv_dump(sv));
580 /* Execute a tr//. sv is the value to be translated, while PL_op
581 * should be an OP_TRANS or OP_TRANSR op, whose op_pv field contains a
582 * translation table or whose op_sv field contains an inversion map.
584 * Returns a count of number of characters translated
588 Perl_do_trans(pTHX_ SV *sv)
591 const U8 flags = PL_op->op_private;
592 bool use_utf8_fcns = cBOOL(flags & OPpTRANS_USE_SVOP);
593 bool identical = cBOOL(flags & OPpTRANS_IDENTICAL);
595 PERL_ARGS_ASSERT_DO_TRANS;
597 if (SvREADONLY(sv) && ! identical) {
598 Perl_croak_no_modify();
600 (void)SvPV_const(sv, len);
604 if (!SvPOKp(sv) || SvTHINKFIRST(sv))
605 (void)SvPV_force_nomg(sv, len);
606 (void)SvPOK_only_UTF8(sv);
612 PAD_SVl(cPADOP->op_padix);
614 MUTABLE_SV(cSVOP->op_sv);
618 return do_trans_count_invmap(sv, (AV *) map);
621 return do_trans_invmap(sv, (AV *) map);
625 const OPtrans_map * const map = (OPtrans_map*)cPVOP->op_pv;
628 return do_trans_count(sv, map);
630 else if (flags & (OPpTRANS_SQUASH|OPpTRANS_DELETE|OPpTRANS_COMPLEMENT)) {
631 return do_trans_complex(sv, map);
634 return do_trans_simple(sv, map);
639 =for apidoc_section $string
642 This performs a Perl L<C<join>|perlfunc/join>, placing the joined output
645 The elements to join are in SVs, stored in a C array of pointers to SVs, from
646 C<**mark> to S<C<**sp - 1>>. Hence C<*mark> is a reference to the first SV.
647 Each SV will be coerced into a PV if not one already.
649 C<delim> contains the string (or coerced into a string) that is to separate
650 each of the joined elements.
652 If any component is in UTF-8, the result will be as well, and all non-UTF-8
653 components will be converted to UTF-8 as necessary.
655 Magic and tainting are handled.
661 Perl_do_join(pTHX_ SV *sv, SV *delim, SV **mark, SV **sp)
663 SV ** const oldmark = mark;
664 I32 items = sp - mark;
667 const char * const delims = SvPV_const(delim, delimlen);
669 PERL_ARGS_ASSERT_DO_JOIN;
672 len = (items > 0 ? (delimlen * (items - 1) ) : 0);
673 SvUPGRADE(sv, SVt_PV);
674 if (SvLEN(sv) < len + items) { /* current length is way too short */
675 while (items-- > 0) {
676 if (*mark && !SvGAMAGIC(*mark) && SvOK(*mark)) {
678 SvPV_const(*mark, tmplen);
683 SvGROW(sv, len + 1); /* so try to pre-extend */
691 /* sv_setpv retains old UTF8ness [perl #24846] */
694 if (TAINTING_get && SvMAGICAL(sv))
704 const U32 delimflag = DO_UTF8(delim) ? SV_CATUTF8 : SV_CATBYTES;
705 for (; items > 0; items--,mark++) {
708 sv_catpvn_flags(sv,delims,delimlen,delimflag);
709 s = SvPV_const(*mark,len);
710 sv_catpvn_flags(sv,s,len,
711 DO_UTF8(*mark) ? SV_CATUTF8 : SV_CATBYTES);
715 for (; items > 0; items--,mark++)
718 const char *s = SvPV_const(*mark,len);
719 sv_catpvn_flags(sv,s,len,
720 DO_UTF8(*mark) ? SV_CATUTF8 : SV_CATBYTES);
727 =for apidoc_section $string
728 =for apidoc do_sprintf
730 This performs a Perl L<C<sprintf>|perlfunc/sprintf> placing the string output
733 The elements to format are in SVs, stored in a C array of pointers to SVs of
734 length C<len>> and beginning at C<**sarg>. The element referenced by C<*sarg>
737 Magic and tainting are handled.
743 Perl_do_sprintf(pTHX_ SV *sv, SSize_t len, SV **sarg)
746 const char * const pat = SvPV_const(*sarg, patlen);
747 bool do_taint = FALSE;
749 PERL_ARGS_ASSERT_DO_SPRINTF;
752 if (SvTAINTED(*sarg))
754 (PL_op && PL_op->op_type < OP_max)
755 ? (PL_op->op_type == OP_PRTF)
757 : PL_op_name[PL_op->op_type]
763 sv_vsetpvfn(sv, pat, patlen, NULL, sarg + 1, (Size_t)(len - 1), &do_taint);
770 Perl_do_vecget(pTHX_ SV *sv, STRLEN offset, int size)
773 const I32 svpv_flags = ((PL_op->op_flags & OPf_MOD || LVRET)
774 ? SV_UNDEF_RETURNS_NULL : 0);
775 unsigned char *s = (unsigned char *)
776 SvPV_flags(sv, srclen, (svpv_flags|SV_GMAGIC));
780 s = (unsigned char *)"";
783 PERL_ARGS_ASSERT_DO_VECGET;
785 if (size < 1 || ! isPOWER_OF_2(size))
786 Perl_croak(aTHX_ "Illegal number of bits in vec");
789 if (Perl_sv_utf8_downgrade_flags(aTHX_ sv, TRUE, 0)) {
790 /* PVX may have changed */
791 s = (unsigned char *) SvPV_flags(sv, srclen, svpv_flags);
794 Perl_croak(aTHX_ "Use of strings with code points over 0xFF"
795 " as arguments to vec is forbidden");
800 STRLEN bitoffs = ((offset % 8) * size) % 8;
801 STRLEN uoffset = offset / (8 / size);
803 if (uoffset >= srclen)
806 retnum = (s[uoffset] >> bitoffs) & nBIT_MASK(size);
809 int n = size / 8; /* required number of bytes */
815 Perl_ck_warner(aTHX_ packWARN(WARN_PORTABLE),
816 "Bit vector size > 32 non-portable");
819 if (offset > Size_t_MAX / n - 1) /* would overflow */
822 uoffset = offset * n;
824 /* Switch on the number of bytes available, but no more than the number
826 switch (MIN(n, (SSize_t) srclen - uoffset)) {
831 retnum += ((UV) s[uoffset + 7]);
834 retnum += ((UV) s[uoffset + 6] << 8); /* = size - 56 */
837 retnum += ((UV) s[uoffset + 5] << 16); /* = size - 48 */
840 retnum += ((UV) s[uoffset + 4] << 24); /* = size - 40 */
844 retnum += ((UV) s[uoffset + 3] << (size - 32));
847 retnum += ((UV) s[uoffset + 2] << (size - 24));
850 retnum += ((UV) s[uoffset + 1] << (size - 16));
853 retnum += ((UV) s[uoffset ] << (size - 8));
864 /* currently converts input to bytes if possible but doesn't sweat failures,
865 * although it does ensure that the string it clobbers is not marked as
866 * utf8-valid any more
869 Perl_do_vecset(pTHX_ SV *sv)
871 STRLEN offset, bitoffs = 0;
878 SV * const targ = LvTARG(sv);
879 char errflags = LvFLAGS(sv);
881 PERL_ARGS_ASSERT_DO_VECSET;
883 /* some out-of-range errors have been deferred if/until the LV is
884 * actually written to: f(vec($s,-1,8)) is not always fatal */
886 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
887 if (errflags & LVf_NEG_OFF)
888 Perl_croak_nocontext("Negative offset to vec in lvalue context");
889 Perl_croak_nocontext("Out of memory!");
894 s = (unsigned char*)SvPV_force_flags(targ, targlen,
895 SV_GMAGIC | SV_UNDEF_RETURNS_NULL);
897 /* This is handled by the SvPOK_only below...
898 if (!Perl_sv_utf8_downgrade_flags(aTHX_ targ, TRUE, 0))
901 (void) Perl_sv_utf8_downgrade_flags(aTHX_ targ, TRUE, 0);
904 (void)SvPOK_only(targ);
906 offset = LvTARGOFF(sv);
907 size = LvTARGLEN(sv);
909 if (size < 1 || (size & (size-1))) /* size < 1 or not a power of two */
910 Perl_croak(aTHX_ "Illegal number of bits in vec");
913 bitoffs = ((offset%8)*size)%8;
918 if (offset > Size_t_MAX / n - 1) /* would overflow */
919 Perl_croak_nocontext("Out of memory!");
923 len = (bitoffs + size + 7)/8; /* required number of bytes */
924 if (targlen < offset || targlen - offset < len) {
925 STRLEN newlen = offset > Size_t_MAX - len - 1 ? /* avoid overflow */
926 Size_t_MAX : offset + len + 1;
927 s = (unsigned char*)SvGROW(targ, newlen);
928 (void)memzero((char *)(s + targlen), newlen - targlen);
929 SvCUR_set(targ, newlen - 1);
933 mask = nBIT_MASK(size);
935 s[offset] &= ~(mask << bitoffs);
936 s[offset] |= lval << bitoffs;
943 Perl_ck_warner(aTHX_ packWARN(WARN_PORTABLE),
944 "Bit vector size > 32 non-portable");
945 s[offset+7] = (U8)( lval ); /* = size - 64 */
946 s[offset+6] = (U8)( lval >> 8); /* = size - 56 */
947 s[offset+5] = (U8)( lval >> 16); /* = size - 48 */
948 s[offset+4] = (U8)( lval >> 24); /* = size - 40 */
952 s[offset+3] = (U8)( lval >> (size - 32));
953 s[offset+2] = (U8)( lval >> (size - 24));
956 s[offset+1] = (U8)( lval >> (size - 16));
959 s[offset ] = (U8)( lval >> (size - 8));
965 Perl_do_vop(pTHX_ I32 optype, SV *sv, SV *left, SV *right)
980 bool result_needs_to_be_utf8 = FALSE;
981 bool left_utf8 = FALSE;
982 bool right_utf8 = FALSE;
983 U8 * left_non_downgraded = NULL;
984 U8 * right_non_downgraded = NULL;
985 Size_t left_non_downgraded_len = 0;
986 Size_t right_non_downgraded_len = 0;
987 char * non_downgraded = NULL;
988 Size_t non_downgraded_len = 0;
990 PERL_ARGS_ASSERT_DO_VOP;
992 if (sv != left || (optype != OP_BIT_AND && !SvOK(sv)))
993 SvPVCLEAR(sv); /* avoid undef warning on |= and ^= */
995 lc = SvPV_force_nomg(left, leftlen);
998 lc = SvPV_nomg_const(left, leftlen);
999 SvPV_force_nomg_nolen(sv);
1001 rc = SvPV_nomg_const(right, rightlen);
1003 /* This needs to come after SvPV to ensure that string overloading has
1006 /* Create downgraded temporaries of any UTF-8 encoded operands */
1007 if (DO_UTF8(left)) {
1008 const U8 * save_lc = (U8 *) lc;
1011 result_needs_to_be_utf8 = TRUE;
1013 left_non_downgraded_len = leftlen;
1014 lc = (char *) bytes_from_utf8_loc((const U8 *) lc, &leftlen,
1016 (const U8 **) &left_non_downgraded);
1017 /* Calculate the number of trailing unconvertible bytes. This quantity
1018 * is the original length minus the length of the converted portion. */
1019 left_non_downgraded_len -= left_non_downgraded - save_lc;
1022 if (DO_UTF8(right)) {
1023 const U8 * save_rc = (U8 *) rc;
1026 result_needs_to_be_utf8 = TRUE;
1028 right_non_downgraded_len = rightlen;
1029 rc = (char *) bytes_from_utf8_loc((const U8 *) rc, &rightlen,
1031 (const U8 **) &right_non_downgraded);
1032 right_non_downgraded_len -= right_non_downgraded - save_rc;
1036 /* We set 'len' to the length that the operation actually operates on. The
1037 * dangling part of the longer operand doesn't actually participate in the
1038 * operation. What happens is that we pretend that the shorter operand has
1039 * been extended to the right by enough imaginary zeros to match the length
1040 * of the longer one. But we know in advance the result of the operation
1041 * on zeros without having to do it. In the case of '&', the result is
1042 * zero, and the dangling portion is simply discarded. For '|' and '^', the
1043 * result is the same as the other operand, so the dangling part is just
1044 * appended to the final result, unchanged. As of perl-5.32, we no longer
1045 * accept above-FF code points in the dangling portion.
1047 if (left_utf8 || right_utf8) {
1048 Perl_croak(aTHX_ FATAL_ABOVE_FF_MSG, PL_op_desc[optype]);
1050 else { /* Neither is UTF-8 */
1051 len = MIN(leftlen, rightlen);
1058 (void)SvPOK_only(sv);
1059 if (SvOK(sv) || SvTYPE(sv) > SVt_PVMG) {
1060 dc = SvPV_force_nomg_nolen(sv);
1061 if (SvLEN(sv) < len + 1) {
1062 dc = SvGROW(sv, len + 1);
1063 (void)memzero(dc + SvCUR(sv), len - SvCUR(sv) + 1);
1067 needlen = optype == OP_BIT_AND
1068 ? len : (leftlen > rightlen ? leftlen : rightlen);
1069 Newxz(dc, needlen + 1, char);
1070 sv_usepvn_flags(sv, dc, needlen, SV_HAS_TRAILING_NUL);
1071 dc = SvPVX(sv); /* sv_usepvn() calls Renew() */
1075 if (len >= sizeof(long)*4 &&
1076 !(PTR2nat(dc) % sizeof(long)) &&
1077 !(PTR2nat(lc) % sizeof(long)) &&
1078 !(PTR2nat(rc) % sizeof(long))) /* It's almost always aligned... */
1080 const STRLEN remainder = len % (sizeof(long)*4);
1081 len /= (sizeof(long)*4);
1090 *dl++ = *ll++ & *rl++;
1091 *dl++ = *ll++ & *rl++;
1092 *dl++ = *ll++ & *rl++;
1093 *dl++ = *ll++ & *rl++;
1098 *dl++ = *ll++ ^ *rl++;
1099 *dl++ = *ll++ ^ *rl++;
1100 *dl++ = *ll++ ^ *rl++;
1101 *dl++ = *ll++ ^ *rl++;
1106 *dl++ = *ll++ | *rl++;
1107 *dl++ = *ll++ | *rl++;
1108 *dl++ = *ll++ | *rl++;
1109 *dl++ = *ll++ | *rl++;
1123 *dc++ = *lc++ & *rc++;
1128 *dc++ = *lc++ ^ *rc++;
1132 *dc++ = *lc++ | *rc++;
1135 if (rightlen > len) {
1137 SvCUR_set(sv, rightlen);
1139 sv_catpvn_nomg(sv, rsave + len, rightlen - len);
1141 else if (leftlen > len) {
1143 SvCUR_set(sv, leftlen);
1145 sv_catpvn_nomg(sv, lsave + len, leftlen - len);
1149 /* If there is trailing stuff that couldn't be converted from UTF-8, it
1150 * is appended as-is for the ^ and | operators. This preserves
1151 * backwards compatibility */
1152 if (right_non_downgraded) {
1153 non_downgraded = (char *) right_non_downgraded;
1154 non_downgraded_len = right_non_downgraded_len;
1156 else if (left_non_downgraded) {
1157 non_downgraded = (char *) left_non_downgraded;
1158 non_downgraded_len = left_non_downgraded_len;
1164 if (result_needs_to_be_utf8) {
1165 sv_utf8_upgrade_nomg(sv);
1167 /* Append any trailing UTF-8 as-is. */
1168 if (non_downgraded) {
1169 sv_catpvn_nomg(sv, non_downgraded, non_downgraded_len);
1177 /* Perl_do_kv() may be:
1178 * * called directly as the pp function for pp_keys() and pp_values();
1179 * * It may also be called directly when the op is OP_AVHVSWITCH, to
1180 * implement CORE::keys(), CORE::values().
1182 * In all cases it expects an HV on the stack and returns a list of keys,
1183 * values, or key-value pairs, depending on PL_op.
1190 HV * const keys = MUTABLE_HV(POPs);
1191 const U8 gimme = GIMME_V;
1193 const I32 dokeys = (PL_op->op_type == OP_KEYS)
1194 || ( PL_op->op_type == OP_AVHVSWITCH
1195 && (PL_op->op_private & OPpAVHVSWITCH_MASK)
1196 + OP_EACH == OP_KEYS);
1198 const I32 dovalues = (PL_op->op_type == OP_VALUES)
1199 || ( PL_op->op_type == OP_AVHVSWITCH
1200 && (PL_op->op_private & OPpAVHVSWITCH_MASK)
1201 + OP_EACH == OP_VALUES);
1203 assert( PL_op->op_type == OP_KEYS
1204 || PL_op->op_type == OP_VALUES
1205 || PL_op->op_type == OP_AVHVSWITCH);
1207 assert(!( PL_op->op_type == OP_VALUES
1208 && (PL_op->op_private & OPpMAYBE_LVSUB)));
1210 (void)hv_iterinit(keys); /* always reset iterator regardless */
1212 if (gimme == G_VOID)
1215 if (gimme == G_SCALAR) {
1216 if (PL_op->op_flags & OPf_MOD || LVRET) { /* lvalue */
1217 SV * const ret = newSV_type_mortal(SVt_PVLV); /* Not TARG RT#67838 */
1218 sv_magic(ret, NULL, PERL_MAGIC_nkeys, NULL, 0);
1220 LvTARG(ret) = SvREFCNT_inc_simple(keys);
1227 /* note that in 'scalar(keys %h)' the OP_KEYS is usually
1228 * optimised away and the action is performed directly by the
1229 * padhv or rv2hv op. We now only get here via OP_AVHVSWITCH
1232 if (! SvTIED_mg((const SV *)keys, PERL_MAGIC_tied) ) {
1233 i = HvUSEDKEYS(keys);
1237 while (hv_iternext(keys)) i++;
1244 if (UNLIKELY(PL_op->op_private & OPpMAYBE_LVSUB)) {
1245 const I32 flags = is_lvalue_sub();
1246 if (flags && !(flags & OPpENTERSUB_INARGS))
1247 /* diag_listed_as: Can't modify %s in %s */
1248 Perl_croak(aTHX_ "Can't modify keys in list assignment");
1252 hv_pushkv(keys, (dokeys | (dovalues << 1)));
1257 * ex: set ts=8 sts=4 sw=4 et: