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"
30 /* Helper function for do_trans().
31 * Handles cases where the search and replacement charlists aren't UTF-8,
32 * aren't identical, and neither the /d nor /s flag is present.
34 * sv may or may not be utf8. Note that no code point above 255 can possibly
35 * be in the to-translate set
39 S_do_trans_simple(pTHX_ SV * const sv, const OPtrans_map * const tbl)
43 U8 *s = (U8*)SvPV_nomg(sv,len);
44 U8 * const send = s+len;
46 PERL_ARGS_ASSERT_DO_TRANS_SIMPLE;
47 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: entering do_trans_simple:"
52 /* First, take care of input strings where UTF8ness doesn't matter */
54 || (PL_op->op_private & OPpTRANS_MASK) == OPpTRANS_ONLY_UTF8_INVARIANTS)
57 const short ch = tbl->map[*s];
67 const bool grows = (PL_op->op_private & OPpTRANS_MASK) == 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 = utf8_to_uv_or_die(s, send, &ulen);
86 if (c < 0x100 && (ch = tbl->map[c]) >= 0) {
88 d = uv_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 = utf8_to_uv_or_die(s, send, &ulen);
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));
193 || (PL_op->op_private & OPpTRANS_MASK) == OPpTRANS_ONLY_UTF8_INVARIANTS)
196 U8 * const dstart = d;
198 if (PL_op->op_private & OPpTRANS_SQUASH) {
200 /* What the mapping of the previous character was to. If the new
201 * character has the same mapping, it is squashed from the output
202 * (but still is included in the count) */
203 short previous_map = (short) TR_OOB;
206 const short this_map = tbl->map[*s];
209 if (this_map != previous_map) {
211 previous_map = this_map;
215 if (this_map == (short) TR_UNMAPPED) {
217 previous_map = (short) TR_OOB;
220 assert(this_map == (short) TR_DELETE);
228 else { /* Not to squash */
230 const short this_map = tbl->map[*s];
235 else if (this_map == (short) TR_UNMAPPED)
237 else if (this_map == (short) TR_DELETE)
243 SvCUR_set(sv, d - dstart);
246 const bool squash = cBOOL(PL_op->op_private & OPpTRANS_SQUASH);
247 const bool grows = (PL_op->op_private & OPpTRANS_MASK) == OPpTRANS_GROWS;
250 Size_t size = tbl->size;
252 /* What the mapping of the previous character was to. If the new
253 * character has the same mapping, it is squashed from the output (but
254 * still is included in the count) */
258 /* Allow for worst-case expansion: Each input byte can become 2.
259 * For a given input character, this happens when it occupies a
260 * single byte under UTF-8, but is to be translated to something
261 * that occupies two: */
262 Newx(d, len*2+1, U8);
269 const UV comp = utf8_to_uv_or_die(s, send, &len);
276 ? (short) TR_UNMAPPED
283 if (LIKELY(!squash || ch != pch)) {
284 d = uv_to_utf8(d, ch);
290 else if (sch == (short) TR_UNMAPPED) {
295 else if (sch == (short) TR_DELETE)
298 assert(sch == (short) TR_R_EMPTY); /* empty replacement */
307 sv_setpvn(sv, (char*)dstart, d - dstart);
312 SvCUR_set(sv, d - dstart);
317 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: returning %zu\n",
318 __FILE__, __LINE__, matches));
319 DEBUG_y(sv_dump(sv));
324 /* Helper function for do_trans().
325 * Handles cases where an inversion map implementation is to be used and the
326 * search and replacement charlists are identical: so the string isn't
327 * modified, and only a count of modifiable chars is needed.
329 * Note that it doesn't handle /d nor /s, since these modify the string
330 * even if the replacement charlist is empty.
332 * sv may or may not be utf8.
336 S_do_trans_count_invmap(pTHX_ SV * const sv, AV * const invmap)
342 SV** const from_invlist_ptr = av_fetch(invmap, 0, TRUE);
343 SV** const to_invmap_ptr = av_fetch(invmap, 1, TRUE);
344 SV* from_invlist = *from_invlist_ptr;
345 SV* to_invmap_sv = *to_invmap_ptr;
346 UV* map = (UV *) SvPVX(to_invmap_sv);
348 PERL_ARGS_ASSERT_DO_TRANS_COUNT_INVMAP;
350 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d:"
351 "entering do_trans_count_invmap:"
353 __FILE__, __LINE__));
354 DEBUG_y(sv_dump(sv));
355 DEBUG_y(PerlIO_printf(Perl_debug_log, "mapping:\n"));
356 DEBUG_y(invmap_dump(from_invlist, (UV *) SvPVX(to_invmap_sv)));
358 s = (U8*)SvPV_nomg(sv, len);
367 /* Get the code point of the next character in the string */
368 if (! SvUTF8(sv) || UTF8_IS_INVARIANT(*s)) {
373 from = utf8_to_uv_or_die(s, send, &s_len);
376 /* Look the code point up in the data structure for this tr/// to get
378 i = _invlist_search(from_invlist, from);
381 if (map[i] != (UV) TR_UNLISTED) {
388 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: returning %zu\n",
389 __FILE__, __LINE__, matches));
393 /* Helper function for do_trans().
394 * Handles cases where an inversion map implementation is to be used and the
395 * search and replacement charlists are either not identical or flags are
398 * sv may or may not be utf8.
402 S_do_trans_invmap(pTHX_ SV * const sv, AV * const invmap)
411 SV** const from_invlist_ptr = av_fetch(invmap, 0, TRUE);
412 SV** const to_invmap_ptr = av_fetch(invmap, 1, TRUE);
413 SV** const to_expansion_ptr = av_fetch(invmap, 2, TRUE);
414 NV max_expansion = SvNV(*to_expansion_ptr);
415 SV* from_invlist = *from_invlist_ptr;
416 SV* to_invmap_sv = *to_invmap_ptr;
417 UV* map = (UV *) SvPVX(to_invmap_sv);
418 UV previous_map = TR_OOB;
419 const bool squash = cBOOL(PL_op->op_private & OPpTRANS_SQUASH);
420 const bool delete_unfound = cBOOL(PL_op->op_private & OPpTRANS_DELETE);
421 bool inplace = (PL_op->op_private & OPpTRANS_MASK) != OPpTRANS_GROWS;
422 const UV* from_array = invlist_array(from_invlist);
423 UV final_map = TR_OOB;
424 bool out_is_utf8 = cBOOL(SvUTF8(sv));
427 PERL_ARGS_ASSERT_DO_TRANS_INVMAP;
429 /* A third element in the array indicates that the replacement list was
430 * shorter than the search list, and this element contains the value to use
431 * for the items that don't correspond */
432 if (av_top_index(invmap) >= 3) {
433 SV** const final_map_ptr = av_fetch(invmap, 3, TRUE);
434 SV* const final_map_sv = *final_map_ptr;
435 final_map = SvUV(final_map_sv);
438 /* If there is something in the transliteration that could force the input
439 * to be changed to UTF-8, we don't know if we can do it in place, so
442 && (PL_op->op_private & OPpTRANS_MASK) == 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_uv_or_die(s, send, &s_len);
492 /* Look the code point up in the data structure for this tr/// to get
494 i = _invlist_search(from_invlist, from);
499 if (to == (UV) TR_UNLISTED) { /* Just copy the unreplaced character */
500 if (UVCHR_IS_INVARIANT(from) || ! out_is_utf8) {
503 else if (SvUTF8(sv)) {
504 Move(s, d, s_len, U8);
507 else { /* Convert to UTF-8 */
508 append_utf8_from_native_byte(*s, &d);
516 /* Everything else is counted as a match */
519 if (to == (UV) TR_SPECIAL_HANDLING) {
520 if (delete_unfound) {
525 /* Use the final character in the replacement list */
528 else { /* Here the input code point is to be remapped. The actual
529 value is offset from the base of this entry */
530 to += from - from_array[i];
533 /* If copying all occurrences, or this is the first occurrence, copy it
535 if (! squash || to != previous_map) {
537 d = uv_to_utf8(d, to);
540 if (to >= 256) { /* If need to convert to UTF-8, restart */
558 sv_setpvn(sv, (char*)d0, d - d0);
563 SvCUR_set(sv, d - d0);
566 if (! SvUTF8(sv) && out_is_utf8) {
571 DEBUG_y(PerlIO_printf(Perl_debug_log, "%s: %d: returning %zu\n",
572 __FILE__, __LINE__, matches));
573 DEBUG_y(sv_dump(sv));
577 /* Execute a tr//. sv is the value to be translated, while PL_op
578 * should be an OP_TRANS or OP_TRANSR op, whose op_pv field contains a
579 * translation table or whose op_sv field contains an inversion map.
581 * Returns a count of number of characters translated
585 Perl_do_trans(pTHX_ SV *sv)
588 const U8 flags = PL_op->op_private;
589 bool use_utf8_fcns = cBOOL(flags & OPpTRANS_USE_SVOP);
590 bool identical = cBOOL(flags & OPpTRANS_IDENTICAL);
592 PERL_ARGS_ASSERT_DO_TRANS;
594 if (SvREADONLY(sv) && ! identical) {
597 (void)SvPV_const(sv, len);
601 if (!SvPOKp(sv) || SvTHINKFIRST(sv))
602 (void)SvPV_force_nomg(sv, len);
603 (void)SvPOK_only_UTF8(sv);
609 PAD_SVl(cPADOP->op_padix);
611 MUTABLE_SV(cSVOP->op_sv);
615 return do_trans_count_invmap(sv, (AV *) map);
618 return do_trans_invmap(sv, (AV *) map);
622 const OPtrans_map * const map = (OPtrans_map*)cPVOP->op_pv;
625 return do_trans_count(sv, map);
627 else if (flags & (OPpTRANS_SQUASH|OPpTRANS_DELETE|OPpTRANS_COMPLEMENT)) {
628 return do_trans_complex(sv, map);
631 return do_trans_simple(sv, map);
636 /* make it small to exercise the logic */
637 # define JOIN_DELIM_BUFSIZE 2
639 # define JOIN_DELIM_BUFSIZE 40
643 =for apidoc_section $string
646 This performs a Perl L<C<join>|perlfunc/join>, placing the joined output
649 The elements to join are in SVs, stored in a C array of pointers to SVs, from
650 C<**mark> to S<C<**sp - 1>>. Hence C<*mark> is a reference to the first SV.
651 Each SV will be coerced into a PV if not one already.
653 C<delim> contains the string (or coerced into a string) that is to separate
654 each of the joined elements.
656 If any component is in UTF-8, the result will be as well, and all non-UTF-8
657 components will be converted to UTF-8 as necessary.
659 Magic and tainting are handled.
665 Perl_do_join(pTHX_ SV *sv, SV *delim, SV **mark, SV **sp)
667 PERL_ARGS_ASSERT_DO_JOIN;
669 SV ** const oldmark = mark;
670 SSize_t items = sp - mark;
673 const char * delimpv = SvPV_const(delim, delimlen);
674 char delim_buf[JOIN_DELIM_BUFSIZE];
675 bool delim_do_utf8 = DO_UTF8(delim);
678 /* Make a copy of the delim, since G or A magic may modify the delim SV.
679 Use a local buffer if possible to avoid the cost of allocation and
682 if (delimlen <= JOIN_DELIM_BUFSIZE) {
683 Copy(delimpv, delim_buf, delimlen, char);
687 delimpv = savepvn(delimpv, delimlen);
693 len = (items > 0 ? (delimlen * (items - 1) ) : 0);
694 SvUPGRADE(sv, SVt_PV);
695 if (SvLEN(sv) < len + items) { /* current length is way too short */
696 while (items-- > 0) {
697 if (*mark && !SvGAMAGIC(*mark) && SvOK(*mark)) {
699 SvPV_const(*mark, tmplen);
704 SvGROW(sv, len + 1); /* so try to pre-extend */
712 /* sv_setpv retains old UTF8ness [perl #24846] */
715 if (TAINTING_get && SvMAGICAL(sv))
725 const U32 delimflag = delim_do_utf8 ? SV_CATUTF8 : SV_CATBYTES;
726 for (; items > 0; items--,mark++) {
729 sv_catpvn_flags(sv, delimpv, delimlen, delimflag);
730 s = SvPV_const(*mark,len);
731 sv_catpvn_flags(sv,s,len,
732 DO_UTF8(*mark) ? SV_CATUTF8 : SV_CATBYTES);
736 for (; items > 0; items--,mark++)
739 const char *s = SvPV_const(*mark,len);
740 sv_catpvn_flags(sv,s,len,
741 DO_UTF8(*mark) ? SV_CATUTF8 : SV_CATBYTES);
748 =for apidoc_section $string
749 =for apidoc do_sprintf
751 This performs a Perl L<C<sprintf>|perlfunc/sprintf> placing the string output
754 The elements to format are in SVs, stored in a C array of pointers to SVs of
755 length C<len>> and beginning at C<**sarg>. The element referenced by C<*sarg>
758 Magic and tainting are handled.
764 Perl_do_sprintf(pTHX_ SV *sv, SSize_t len, SV **sarg)
767 const char * const pat = SvPV_const(*sarg, patlen);
768 bool do_taint = FALSE;
770 PERL_ARGS_ASSERT_DO_SPRINTF;
773 if (SvTAINTED(*sarg))
775 (PL_op && PL_op->op_type < OP_max)
776 ? (PL_op->op_type == OP_PRTF)
778 : PL_op_name[PL_op->op_type]
784 sv_vsetpvfn(sv, pat, patlen, NULL, sarg + 1, (Size_t)(len - 1), &do_taint);
791 Perl_do_vecget(pTHX_ SV *sv, STRLEN offset, int size)
794 const I32 svpv_flags = ((PL_op->op_flags & OPf_MOD || LVRET)
795 ? SV_UNDEF_RETURNS_NULL : 0);
796 unsigned char *s = (unsigned char *)
797 SvPV_flags(sv, srclen, (svpv_flags|SV_GMAGIC));
801 s = (unsigned char *)"";
804 PERL_ARGS_ASSERT_DO_VECGET;
806 if (size < 1 || ! isPOWER_OF_2(size))
807 croak("Illegal number of bits in vec");
810 if (Perl_sv_utf8_downgrade_flags(aTHX_ sv, TRUE, 0)) {
811 /* PVX may have changed */
812 s = (unsigned char *) SvPV_flags(sv, srclen, svpv_flags);
815 croak("Use of strings with code points over 0xFF"
816 " as arguments to vec is forbidden");
821 STRLEN bitoffs = ((offset % 8) * size) % 8;
822 STRLEN uoffset = offset / (8 / size);
824 if (uoffset >= srclen)
827 retnum = (s[uoffset] >> bitoffs) & nBIT_MASK(size);
830 int n = size / 8; /* required number of bytes */
836 ck_warner(packWARN(WARN_PORTABLE),
837 "Bit vector size > 32 non-portable");
840 if (offset > Size_t_MAX / n - 1) /* would overflow */
843 uoffset = offset * n;
845 /* Switch on the number of bytes available, but no more than the number
847 switch (MIN(n, (SSize_t) srclen - uoffset)) {
852 retnum += ((UV) s[uoffset + 7]);
855 retnum += ((UV) s[uoffset + 6] << 8); /* = size - 56 */
858 retnum += ((UV) s[uoffset + 5] << 16); /* = size - 48 */
861 retnum += ((UV) s[uoffset + 4] << 24); /* = size - 40 */
865 retnum += ((UV) s[uoffset + 3] << (size - 32));
868 retnum += ((UV) s[uoffset + 2] << (size - 24));
871 retnum += ((UV) s[uoffset + 1] << (size - 16));
874 retnum += ((UV) s[uoffset ] << (size - 8));
885 /* currently converts input to bytes if possible but doesn't sweat failures,
886 * although it does ensure that the string it clobbers is not marked as
887 * utf8-valid any more
890 Perl_do_vecset(pTHX_ SV *sv)
892 STRLEN offset, bitoffs = 0;
899 SV * const targ = LvTARG(sv);
900 char errflags = LvFLAGS(sv);
902 PERL_ARGS_ASSERT_DO_VECSET;
904 /* some out-of-range errors have been deferred if/until the LV is
905 * actually written to: f(vec($s,-1,8)) is not always fatal */
907 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
908 if (errflags & LVf_NEG_OFF)
909 croak("Negative offset to vec in lvalue context");
910 croak("Out of memory during vec in lvalue context");
915 s = (unsigned char*)SvPV_force_flags(targ, targlen,
916 SV_GMAGIC | SV_UNDEF_RETURNS_NULL);
918 /* This is handled by the SvPOK_only below...
919 if (!Perl_sv_utf8_downgrade_flags(aTHX_ targ, TRUE, 0))
922 (void) Perl_sv_utf8_downgrade_flags(aTHX_ targ, TRUE, 0);
925 (void)SvPOK_only(targ);
927 offset = LvTARGOFF(sv);
928 size = LvTARGLEN(sv);
930 if (size < 1 || (size & (size-1))) /* size < 1 or not a power of two */
931 croak("Illegal number of bits in vec");
934 bitoffs = ((offset%8)*size)%8;
939 if (offset > Size_t_MAX / n - 1) /* would overflow */
940 croak("Out of memory during vec in lvalue context");
944 len = (bitoffs + size + 7)/8; /* required number of bytes */
945 if (targlen < offset || targlen - offset < len) {
946 STRLEN newlen = offset > Size_t_MAX - len - 1 ? /* avoid overflow */
947 Size_t_MAX : offset + len + 1;
948 s = (unsigned char*)SvGROW(targ, newlen);
949 (void)memzero((char *)(s + targlen), newlen - targlen);
950 SvCUR_set(targ, newlen - 1);
954 mask = nBIT_MASK(size);
956 s[offset] &= ~(mask << bitoffs);
957 s[offset] |= lval << bitoffs;
964 ck_warner(packWARN(WARN_PORTABLE),
965 "Bit vector size > 32 non-portable");
966 s[offset+7] = (U8)( lval ); /* = size - 64 */
967 s[offset+6] = (U8)( lval >> 8); /* = size - 56 */
968 s[offset+5] = (U8)( lval >> 16); /* = size - 48 */
969 s[offset+4] = (U8)( lval >> 24); /* = size - 40 */
973 s[offset+3] = (U8)( lval >> (size - 32));
974 s[offset+2] = (U8)( lval >> (size - 24));
977 s[offset+1] = (U8)( lval >> (size - 16));
980 s[offset ] = (U8)( lval >> (size - 8));
986 Perl_do_vop(pTHX_ I32 optype, SV *sv, SV *left, SV *right)
1001 bool result_needs_to_be_utf8 = FALSE;
1002 bool left_utf8 = FALSE;
1003 bool right_utf8 = FALSE;
1005 PERL_ARGS_ASSERT_DO_VOP;
1007 if (sv != left || (optype != OP_BIT_AND && !SvOK(sv)))
1008 SvPVCLEAR(sv); /* avoid undef warning on |= and ^= */
1010 lc = SvPV_force_nomg(left, leftlen);
1013 lc = SvPV_nomg_const(left, leftlen);
1014 SvPV_force_nomg_nolen(sv);
1016 rc = SvPV_nomg_const(right, rightlen);
1018 /* This needs to come after SvPV to ensure that string overloading has
1021 /* Create downgraded temporaries of any UTF-8 encoded operands. As of
1022 * perl-5.32, we no longer accept above-FF code points at all */
1023 if (DO_UTF8(left)) {
1024 result_needs_to_be_utf8 = TRUE;
1025 left_utf8 = ! utf8_to_bytes_temp_pv((const U8 **) &lc, &leftlen);
1027 if (DO_UTF8(right)) {
1028 result_needs_to_be_utf8 = TRUE;
1029 right_utf8 = ! utf8_to_bytes_temp_pv((const U8 **) &rc, &rightlen);
1032 /* We set 'len' to the length that the operation actually operates on. The
1033 * dangling part of the longer operand doesn't actually participate in the
1034 * operation. What happens is that we pretend that the shorter operand has
1035 * been extended to the right by enough imaginary zeros to match the length
1036 * of the longer one. But we know in advance the result of the operation
1037 * on zeros without having to do it. In the case of '&', the result is
1038 * zero, and the dangling portion is simply discarded. For '|' and '^', the
1039 * result is the same as the other operand, so the dangling part is just
1040 * appended to the final result, unchanged. */
1041 if (left_utf8 || right_utf8) {
1042 croak(FATAL_ABOVE_FF_MSG, PL_op_desc[optype]);
1044 else { /* Neither is UTF-8 */
1045 len = MIN(leftlen, rightlen);
1052 (void)SvPOK_only(sv);
1053 if (SvOK(sv) || SvTYPE(sv) > SVt_PVMG) {
1054 dc = SvPV_force_nomg_nolen(sv);
1055 if (SvLEN(sv) < len + 1) {
1056 dc = SvGROW(sv, len + 1);
1057 (void)memzero(dc + SvCUR(sv), len - SvCUR(sv) + 1);
1061 needlen = optype == OP_BIT_AND
1062 ? len : (leftlen > rightlen ? leftlen : rightlen);
1063 Newxz(dc, needlen + 1, char);
1064 sv_usepvn_flags(sv, dc, needlen, SV_HAS_TRAILING_NUL);
1065 dc = SvPVX(sv); /* sv_usepvn() calls Renew() */
1069 if (len >= sizeof(long)*4 &&
1070 !(PTR2nat(dc) % sizeof(long)) &&
1071 !(PTR2nat(lc) % sizeof(long)) &&
1072 !(PTR2nat(rc) % sizeof(long))) /* It's almost always aligned... */
1074 const STRLEN remainder = len % (sizeof(long)*4);
1075 len /= (sizeof(long)*4);
1084 *dl++ = *ll++ & *rl++;
1085 *dl++ = *ll++ & *rl++;
1086 *dl++ = *ll++ & *rl++;
1087 *dl++ = *ll++ & *rl++;
1092 *dl++ = *ll++ ^ *rl++;
1093 *dl++ = *ll++ ^ *rl++;
1094 *dl++ = *ll++ ^ *rl++;
1095 *dl++ = *ll++ ^ *rl++;
1100 *dl++ = *ll++ | *rl++;
1101 *dl++ = *ll++ | *rl++;
1102 *dl++ = *ll++ | *rl++;
1103 *dl++ = *ll++ | *rl++;
1117 *dc++ = *lc++ & *rc++;
1122 *dc++ = *lc++ ^ *rc++;
1126 *dc++ = *lc++ | *rc++;
1129 if (rightlen > len) {
1131 SvCUR_set(sv, rightlen);
1133 sv_catpvn_nomg(sv, rsave + len, rightlen - len);
1135 else if (leftlen > len) {
1137 SvCUR_set(sv, leftlen);
1139 sv_catpvn_nomg(sv, lsave + len, leftlen - len);
1145 if (result_needs_to_be_utf8) {
1146 sv_utf8_upgrade_nomg(sv);
1153 /* Perl_do_kv() may be:
1154 * * called directly as the pp function for pp_keys() and pp_values();
1155 * * It may also be called directly when the op is OP_AVHVSWITCH, to
1156 * implement CORE::keys(), CORE::values().
1158 * In all cases it expects an HV on the stack and returns a list of keys,
1159 * values, or key-value pairs, depending on PL_op.
1164 HV * const keys = MUTABLE_HV(*PL_stack_sp);
1165 const U8 gimme = GIMME_V;
1167 const I32 dokeys = (PL_op->op_type == OP_KEYS)
1168 || ( PL_op->op_type == OP_AVHVSWITCH
1169 && (PL_op->op_private & OPpAVHVSWITCH_MASK)
1170 + OP_EACH == OP_KEYS);
1172 const I32 dovalues = (PL_op->op_type == OP_VALUES)
1173 || ( PL_op->op_type == OP_AVHVSWITCH
1174 && (PL_op->op_private & OPpAVHVSWITCH_MASK)
1175 + OP_EACH == OP_VALUES);
1177 assert( PL_op->op_type == OP_KEYS
1178 || PL_op->op_type == OP_VALUES
1179 || PL_op->op_type == OP_AVHVSWITCH);
1181 assert(!( PL_op->op_type == OP_VALUES
1182 && (PL_op->op_private & OPpMAYBE_LVSUB)));
1184 (void)hv_iterinit(keys); /* always reset iterator regardless */
1186 if (gimme == G_VOID) {
1191 if (gimme == G_SCALAR) {
1192 if (PL_op->op_flags & OPf_MOD || LVRET) { /* lvalue */
1193 SV * const ret = newSV_type_mortal(SVt_PVLV); /* Not TARG RT#67838 */
1194 sv_magic(ret, NULL, PERL_MAGIC_nkeys, NULL, 0);
1196 LvTARG(ret) = SvREFCNT_inc_simple(keys);
1197 rpp_replace_1_1(ret);
1203 /* note that in 'scalar(keys %h)' the OP_KEYS is usually
1204 * optimised away and the action is performed directly by the
1205 * padhv or rv2hv op. We now only get here via OP_AVHVSWITCH
1208 if (! SvTIED_mg((const SV *)keys, PERL_MAGIC_tied) ) {
1209 i = HvUSEDKEYS(keys);
1213 while (hv_iternext(keys)) i++;
1216 rpp_replace_1_1(targ);
1221 /* list context only here */
1223 if (UNLIKELY(PL_op->op_private & OPpMAYBE_LVSUB)) {
1224 const I32 flags = is_lvalue_sub();
1225 if (flags && !(flags & OPpENTERSUB_INARGS))
1226 /* diag_listed_as: Can't modify %s in %s */
1227 croak("Can't modify keys in list assignment");
1230 /* push all keys and/or values onto stack */
1231 #ifdef PERL_RC_STACK
1232 SSize_t sp_base = PL_stack_sp - PL_stack_base;
1233 hv_pushkv(keys, (dokeys | (dovalues << 1)));
1234 /* Now safe to free the original arg on the stack and shuffle
1235 * down one place anything pushed on top of it */
1236 SSize_t nitems = PL_stack_sp - (PL_stack_base + sp_base);
1237 SV *old_sv = PL_stack_sp[-nitems];
1239 Move(PL_stack_sp - nitems + 1,
1240 PL_stack_sp - nitems, nitems, SV*);
1242 SvREFCNT_dec_NN(old_sv);
1245 hv_pushkv(keys, (dokeys | (dovalues << 1)));
1251 * ex: set ts=8 sts=4 sw=4 et: