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[perl #112966] Crash on delete local; other local bugs
[perl5.git] / pp.c
CommitLineData
a0d0e21e 1/* pp.c
79072805 2 *
1129b882
NC		 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805 5 *
a0d0e21e
LW		 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.
79072805 8 *
a0d0e21e
LW		 9 */
10
11/*
4ac71550
TC		 12 * 'It's a big house this, and very peculiar. Always a bit more
13 * to discover, and no knowing what you'll find round a corner.
14 * And Elves, sir!' --Samwise Gamgee
15 *
16 * [p.225 of _The Lord of the Rings_, II/i: "Many Meetings"]
a0d0e21e 17 */
79072805 18
166f8a29
DM		 19/* This file contains general pp ("push/pop") functions that execute the
20 * opcodes that make up a perl program. A typical pp function expects to
21 * find its arguments on the stack, and usually pushes its results onto
22 * the stack, hence the 'pp' terminology. Each OP structure contains
23 * a pointer to the relevant pp_foo() function.
24 */
25
79072805 26#include "EXTERN.h"
864dbfa3 27#define PERL_IN_PP_C
79072805 28#include "perl.h"
77bc9082 29#include "keywords.h"
79072805 30
a4af207c
JH		 31#include "reentr.h"
32
dfe9444c
AD		 33/* XXX I can't imagine anyone who doesn't have this actually _needs_
34 it, since pid_t is an integral type.
35 --AD 2/20/1998
36*/
37#ifdef NEED_GETPID_PROTO
38extern Pid_t getpid (void);
8ac85365
NIS		 39#endif
40
0630166f
SP		 41/*
42 * Some BSDs and Cygwin default to POSIX math instead of IEEE.
43 * This switches them over to IEEE.
44 */
45#if defined(LIBM_LIB_VERSION)
46 _LIB_VERSION_TYPE _LIB_VERSION = _IEEE_;
47#endif
48
13017935
SM		 49/* variations on pp_null */
50
93a17b20
LW		 51PP(pp_stub)
52{
97aff369 53 dVAR;
39644a26 54 dSP;
54310121 55 if (GIMME_V == G_SCALAR)
3280af22 56 XPUSHs(&PL_sv_undef);
93a17b20
LW		 57 RETURN;
58}
59
79072805
LW		 60/* Pushy stuff. */
61
93a17b20
LW		 62PP(pp_padav)
63{
97aff369 64 dVAR; dSP; dTARGET;
13017935 65 I32 gimme;
e190e9b4 66 assert(SvTYPE(TARG) == SVt_PVAV);
533c011a 67 if (PL_op->op_private & OPpLVAL_INTRO)
a5911867
RGS		 68 if (!(PL_op->op_private & OPpPAD_STATE))
69 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
85e6fe83 70 EXTEND(SP, 1);
533c011a 71 if (PL_op->op_flags & OPf_REF) {
85e6fe83 72 PUSHs(TARG);
93a17b20 73 RETURN;
40c94d11
FC		 74 } else if (PL_op->op_private & OPpMAYBE_LVSUB) {
75 const I32 flags = is_lvalue_sub();
76 if (flags && !(flags & OPpENTERSUB_INARGS)) {
78f9721b 77 if (GIMME == G_SCALAR)
a84828f3 78 /* diag_listed_as: Can't return %s to lvalue scalar context */
78f9721b
SM		 79 Perl_croak(aTHX_ "Can't return array to lvalue scalar context");
80 PUSHs(TARG);
81 RETURN;
40c94d11 82 }
85e6fe83 83 }
13017935
SM		 84 gimme = GIMME_V;
85 if (gimme == G_ARRAY) {
502c6561 86 const I32 maxarg = AvFILL(MUTABLE_AV(TARG)) + 1;
85e6fe83 87 EXTEND(SP, maxarg);
93965878
NIS		 88 if (SvMAGICAL(TARG)) {
89 U32 i;
eb160463 90 for (i=0; i < (U32)maxarg; i++) {
502c6561 91 SV * const * const svp = av_fetch(MUTABLE_AV(TARG), i, FALSE);
3280af22 92 SP[i+1] = (svp) ? *svp : &PL_sv_undef;
93965878
NIS		 93 }
94 }
95 else {
502c6561 96 Copy(AvARRAY((const AV *)TARG), SP+1, maxarg, SV*);
93965878 97 }
85e6fe83
LW		 98 SP += maxarg;
99 }
13017935 100 else if (gimme == G_SCALAR) {
1b6737cc 101 SV* const sv = sv_newmortal();
502c6561 102 const I32 maxarg = AvFILL(MUTABLE_AV(TARG)) + 1;
85e6fe83
LW		 103 sv_setiv(sv, maxarg);
104 PUSHs(sv);
105 }
106 RETURN;
93a17b20
LW		 107}
108
109PP(pp_padhv)
110{
97aff369 111 dVAR; dSP; dTARGET;
54310121 112 I32 gimme;
113
e190e9b4 114 assert(SvTYPE(TARG) == SVt_PVHV);
93a17b20 115 XPUSHs(TARG);
533c011a 116 if (PL_op->op_private & OPpLVAL_INTRO)
a5911867
RGS		 117 if (!(PL_op->op_private & OPpPAD_STATE))
118 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
533c011a 119 if (PL_op->op_flags & OPf_REF)
93a17b20 120 RETURN;
40c94d11
FC		 121 else if (PL_op->op_private & OPpMAYBE_LVSUB) {
122 const I32 flags = is_lvalue_sub();
123 if (flags && !(flags & OPpENTERSUB_INARGS)) {
78f9721b 124 if (GIMME == G_SCALAR)
a84828f3 125 /* diag_listed_as: Can't return %s to lvalue scalar context */
78f9721b
SM		 126 Perl_croak(aTHX_ "Can't return hash to lvalue scalar context");
127 RETURN;
40c94d11 128 }
78f9721b 129 }
54310121 130 gimme = GIMME_V;
131 if (gimme == G_ARRAY) {
981b7185 132 RETURNOP(Perl_do_kv(aTHX));
85e6fe83 133 }
54310121 134 else if (gimme == G_SCALAR) {
85fbaab2 135 SV* const sv = Perl_hv_scalar(aTHX_ MUTABLE_HV(TARG));
85e6fe83 136 SETs(sv);
85e6fe83 137 }
54310121 138 RETURN;
93a17b20
LW		 139}
140
79072805
LW		 141/* Translations. */
142
4bdf8368 143static const char S_no_symref_sv[] =
def89bff
NC		 144 "Can't use string (\"%" SVf32 "\"%s) as %s ref while \"strict refs\" in use";
145
6f7909da
FC		 146/* In some cases this function inspects PL_op. If this function is called
147 for new op types, more bool parameters may need to be added in place of
148 the checks.
149
150 When noinit is true, the absence of a gv will cause a retval of undef.
151 This is unrelated to the cv-to-gv assignment case.
6f7909da
FC		 152*/
153
154static SV *
155S_rv2gv(pTHX_ SV *sv, const bool vivify_sv, const bool strict,
156 const bool noinit)
157{
14f0f125 158 dVAR;
f64c9ac5 159 if (!isGV(sv) || SvFAKE(sv)) SvGETMAGIC(sv);
ed6116ce 160 if (SvROK(sv)) {
93d7320b
DM		 161 if (SvAMAGIC(sv)) {
162 sv = amagic_deref_call(sv, to_gv_amg);
93d7320b 163 }
e4a1664f 164 wasref:
ed6116ce 165 sv = SvRV(sv);
b1dadf13 166 if (SvTYPE(sv) == SVt_PVIO) {
159b6efe 167 GV * const gv = MUTABLE_GV(sv_newmortal());
885f468a 168 gv_init(gv, 0, "__ANONIO__", 10, 0);
a45c7426 169 GvIOp(gv) = MUTABLE_IO(sv);
b37c2d43 170 SvREFCNT_inc_void_NN(sv);
ad64d0ec 171 sv = MUTABLE_SV(gv);
ef54e1a4 172 }
6e592b3a 173 else if (!isGV_with_GP(sv))
6f7909da 174 return (SV *)Perl_die(aTHX_ "Not a GLOB reference");
79072805
LW		 175 }
176 else {
6e592b3a 177 if (!isGV_with_GP(sv)) {
f132ae69 178 if (!SvOK(sv)) {
b13b2135 179 /* If this is a 'my' scalar and flag is set then vivify
853846ea 180 * NI-S 1999/05/07
b13b2135 181 */
f132ae69 182 if (vivify_sv && sv != &PL_sv_undef) {
2c8ac474 183 GV *gv;
ce74145d
FC		 184 if (SvREADONLY(sv))
185 Perl_croak_no_modify(aTHX);
2c8ac474 186 if (cUNOP->op_targ) {
0bd48802 187 SV * const namesv = PAD_SV(cUNOP->op_targ);
159b6efe 188 gv = MUTABLE_GV(newSV(0));
6b10071b 189 gv_init_sv(gv, CopSTASH(PL_curcop), namesv, 0);
2c8ac474
GS		 190 }
191 else {
0bd48802 192 const char * const name = CopSTASHPV(PL_curcop);
6b10071b
BF		 193 gv = newGVgen_flags(name,
194 HvNAMEUTF8(CopSTASH(PL_curcop)) ? SVf_UTF8 : 0 );
1d8d4d2a 195 }
43230e26 196 prepare_SV_for_RV(sv);
ad64d0ec 197 SvRV_set(sv, MUTABLE_SV(gv));
853846ea 198 SvROK_on(sv);
1d8d4d2a 199 SvSETMAGIC(sv);
853846ea 200 goto wasref;
2c8ac474 201 }
6f7909da
FC		 202 if (PL_op->op_flags & OPf_REF || strict)
203 return (SV *)Perl_die(aTHX_ PL_no_usym, "a symbol");
599cee73 204 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 205 report_uninit(sv);
6f7909da 206 return &PL_sv_undef;
a0d0e21e 207 }
6f7909da 208 if (noinit)
35cd451c 209 {
77cb3b01
FC		 210 if (!(sv = MUTABLE_SV(gv_fetchsv_nomg(
211 sv, GV_ADDMG, SVt_PVGV
23496c6e 212 ))))
6f7909da 213 return &PL_sv_undef;
35cd451c
GS		 214 }
215 else {
6f7909da
FC		 216 if (strict)
217 return
218 (SV *)Perl_die(aTHX_
219 S_no_symref_sv,
220 sv,
bf3d870f 221 (SvPOKp(sv) && SvCUR(sv)>32 ? "..." : ""),
6f7909da
FC		 222 "a symbol"
223 );
e26df76a
NC		 224 if ((PL_op->op_private & (OPpLVAL_INTRO|OPpDONT_INIT_GV))
225 == OPpDONT_INIT_GV) {
226 /* We are the target of a coderef assignment. Return
227 the scalar unchanged, and let pp_sasssign deal with
228 things. */
6f7909da 229 return sv;
e26df76a 230 }
77cb3b01 231 sv = MUTABLE_SV(gv_fetchsv_nomg(sv, GV_ADD, SVt_PVGV));
35cd451c 232 }
2acc3314 233 /* FAKE globs in the symbol table cause weird bugs (#77810) */
96293f45 234 SvFAKE_off(sv);
93a17b20 235 }
79072805 236 }
8dc99089 237 if (SvFAKE(sv) && !(PL_op->op_private & OPpALLOW_FAKE)) {
2acc3314 238 SV *newsv = sv_newmortal();
5cf4b255 239 sv_setsv_flags(newsv, sv, 0);
2acc3314 240 SvFAKE_off(newsv);
d8906c05 241 sv = newsv;
2acc3314 242 }
6f7909da
FC		 243 return sv;
244}
245
246PP(pp_rv2gv)
247{
248 dVAR; dSP; dTOPss;
249
250 sv = S_rv2gv(aTHX_
251 sv, PL_op->op_private & OPpDEREF,
252 PL_op->op_private & HINT_STRICT_REFS,
253 ((PL_op->op_flags & OPf_SPECIAL) && !(PL_op->op_flags & OPf_MOD))
254 || PL_op->op_type == OP_READLINE
255 );
d8906c05
FC		 256 if (PL_op->op_private & OPpLVAL_INTRO)
257 save_gp(MUTABLE_GV(sv), !(PL_op->op_flags & OPf_SPECIAL));
258 SETs(sv);
79072805
LW		 259 RETURN;
260}
261
dc3c76f8
NC		 262/* Helper function for pp_rv2sv and pp_rv2av */
263GV *
fe9845cc
RB		 264Perl_softref2xv(pTHX_ SV *const sv, const char *const what,
265 const svtype type, SV ***spp)
dc3c76f8
NC		 266{
267 dVAR;
268 GV *gv;
269
7918f24d
NC		 270 PERL_ARGS_ASSERT_SOFTREF2XV;
271
dc3c76f8
NC		 272 if (PL_op->op_private & HINT_STRICT_REFS) {
273 if (SvOK(sv))
bf3d870f
FC		 274 Perl_die(aTHX_ S_no_symref_sv, sv,
275 (SvPOKp(sv) && SvCUR(sv)>32 ? "..." : ""), what);
dc3c76f8
NC		 276 else
277 Perl_die(aTHX_ PL_no_usym, what);
278 }
279 if (!SvOK(sv)) {
fd1d9b5c
FC		 280 if (
281 PL_op->op_flags & OPf_REF &&
282 PL_op->op_next->op_type != OP_BOOLKEYS
283 )
dc3c76f8
NC		 284 Perl_die(aTHX_ PL_no_usym, what);
285 if (ckWARN(WARN_UNINITIALIZED))
286 report_uninit(sv);
287 if (type != SVt_PV && GIMME_V == G_ARRAY) {
288 (*spp)--;
289 return NULL;
290 }
291 **spp = &PL_sv_undef;
292 return NULL;
293 }
294 if ((PL_op->op_flags & OPf_SPECIAL) &&
295 !(PL_op->op_flags & OPf_MOD))
296 {
77cb3b01 297 if (!(gv = gv_fetchsv_nomg(sv, GV_ADDMG, type)))
dc3c76f8
NC		 298 {
299 **spp = &PL_sv_undef;
300 return NULL;
301 }
302 }
303 else {
77cb3b01 304 gv = gv_fetchsv_nomg(sv, GV_ADD, type);
dc3c76f8
NC		 305 }
306 return gv;
307}
308
79072805
LW		 309PP(pp_rv2sv)
310{
97aff369 311 dVAR; dSP; dTOPss;
c445ea15 312 GV *gv = NULL;
79072805 313
9026059d 314 SvGETMAGIC(sv);
ed6116ce 315 if (SvROK(sv)) {
93d7320b
DM		 316 if (SvAMAGIC(sv)) {
317 sv = amagic_deref_call(sv, to_sv_amg);
93d7320b 318 }
f5284f61 319
ed6116ce 320 sv = SvRV(sv);
79072805
LW		 321 switch (SvTYPE(sv)) {
322 case SVt_PVAV:
323 case SVt_PVHV:
324 case SVt_PVCV:
cbae9b9f
YST		 325 case SVt_PVFM:
326 case SVt_PVIO:
cea2e8a9 327 DIE(aTHX_ "Not a SCALAR reference");
42d0e0b7 328 default: NOOP;
79072805
LW		 329 }
330 }
331 else {
159b6efe 332 gv = MUTABLE_GV(sv);
748a9306 333
6e592b3a 334 if (!isGV_with_GP(gv)) {
dc3c76f8
NC		 335 gv = Perl_softref2xv(aTHX_ sv, "a SCALAR", SVt_PV, &sp);
336 if (!gv)
337 RETURN;
463ee0b2 338 }
29c711a3 339 sv = GvSVn(gv);
a0d0e21e 340 }
533c011a 341 if (PL_op->op_flags & OPf_MOD) {
82d03984
RGS		 342 if (PL_op->op_private & OPpLVAL_INTRO) {
343 if (cUNOP->op_first->op_type == OP_NULL)
159b6efe 344 sv = save_scalar(MUTABLE_GV(TOPs));
82d03984
RGS		 345 else if (gv)
346 sv = save_scalar(gv);
347 else
f1f66076 348 Perl_croak(aTHX_ "%s", PL_no_localize_ref);
82d03984 349 }
533c011a 350 else if (PL_op->op_private & OPpDEREF)
9026059d 351 sv = vivify_ref(sv, PL_op->op_private & OPpDEREF);
79072805 352 }
a0d0e21e 353 SETs(sv);
79072805
LW		 354 RETURN;
355}
356
357PP(pp_av2arylen)
358{
97aff369 359 dVAR; dSP;
502c6561 360 AV * const av = MUTABLE_AV(TOPs);
02d85cc3
EB		 361 const I32 lvalue = PL_op->op_flags & OPf_MOD || LVRET;
362 if (lvalue) {
363 SV ** const sv = Perl_av_arylen_p(aTHX_ MUTABLE_AV(av));
364 if (!*sv) {
365 *sv = newSV_type(SVt_PVMG);
366 sv_magic(*sv, MUTABLE_SV(av), PERL_MAGIC_arylen, NULL, 0);
367 }
368 SETs(*sv);
369 } else {
e1dccc0d 370 SETs(sv_2mortal(newSViv(AvFILL(MUTABLE_AV(av)))));
79072805 371 }
79072805
LW		 372 RETURN;
373}
374
a0d0e21e
LW		 375PP(pp_pos)
376{
2154eca7 377 dVAR; dSP; dPOPss;
8ec5e241 378
78f9721b 379 if (PL_op->op_flags & OPf_MOD || LVRET) {
16eb5365
FC		 380 SV * const ret = sv_2mortal(newSV_type(SVt_PVLV)); /* Not TARG RT#67838 */
381 sv_magic(ret, NULL, PERL_MAGIC_pos, NULL, 0);
382 LvTYPE(ret) = '.';
383 LvTARG(ret) = SvREFCNT_inc_simple(sv);
2154eca7 384 PUSHs(ret); /* no SvSETMAGIC */
a0d0e21e
LW		 385 RETURN;
386 }
387 else {
a0d0e21e 388 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
1b6737cc 389 const MAGIC * const mg = mg_find(sv, PERL_MAGIC_regex_global);
565764a8 390 if (mg && mg->mg_len >= 0) {
2154eca7 391 dTARGET;
a0ed51b3 392 I32 i = mg->mg_len;
7e2040f0 393 if (DO_UTF8(sv))
a0ed51b3 394 sv_pos_b2u(sv, &i);
e1dccc0d 395 PUSHi(i);
a0d0e21e
LW		 396 RETURN;
397 }
398 }
399 RETPUSHUNDEF;
400 }
401}
402
79072805
LW		 403PP(pp_rv2cv)
404{
97aff369 405 dVAR; dSP;
79072805 406 GV *gv;
1eced8f8 407 HV *stash_unused;
c445ea15 408 const I32 flags = (PL_op->op_flags & OPf_SPECIAL)
9da346da 409 ? GV_ADDMG
c445ea15
AL		 410 : ((PL_op->op_private & (OPpLVAL_INTRO|OPpMAY_RETURN_CONSTANT)) == OPpMAY_RETURN_CONSTANT)
411 ? GV_ADD|GV_NOEXPAND
412 : GV_ADD;
4633a7c4
LW		 413 /* We usually try to add a non-existent subroutine in case of AUTOLOAD. */
414 /* (But not in defined().) */
e26df76a 415
1eced8f8 416 CV *cv = sv_2cv(TOPs, &stash_unused, &gv, flags);
5a20ba3d 417 if (cv) NOOP;
e26df76a 418 else if ((flags == (GV_ADD|GV_NOEXPAND)) && gv && SvROK(gv)) {
ea726b52 419 cv = MUTABLE_CV(gv);
e26df76a 420 }
07055b4c 421 else
ea726b52 422 cv = MUTABLE_CV(&PL_sv_undef);
ad64d0ec 423 SETs(MUTABLE_SV(cv));
79072805
LW		 424 RETURN;
425}
426
c07a80fd 427PP(pp_prototype)
428{
97aff369 429 dVAR; dSP;
c07a80fd 430 CV *cv;
431 HV *stash;
432 GV *gv;
fabdb6c0 433 SV *ret = &PL_sv_undef;
c07a80fd 434
6954f42f 435 if (SvGMAGICAL(TOPs)) SETs(sv_mortalcopy(TOPs));
b6c543e3 436 if (SvPOK(TOPs) && SvCUR(TOPs) >= 7) {
e3f73d4e 437 const char * s = SvPVX_const(TOPs);
b6c543e3 438 if (strnEQ(s, "CORE::", 6)) {
be1b855b 439 const int code = keyword(s + 6, SvCUR(TOPs) - 6, 1);
b66130dd 440 if (!code || code == -KEY_CORE)
1b08e051
FC		 441 DIE(aTHX_ "Can't find an opnumber for \"%"SVf"\"",
442 SVfARG(newSVpvn_flags(
443 s+6, SvCUR(TOPs)-6, SvFLAGS(TOPs) & SVf_UTF8
444 )));
4e338c21 445 {
b66130dd
FC		 446 SV * const sv = core_prototype(NULL, s + 6, code, NULL);
447 if (sv) ret = sv;
448 }
b8c38f0a 449 goto set;
b6c543e3
IZ		 450 }
451 }
f2c0649b 452 cv = sv_2cv(TOPs, &stash, &gv, 0);
5f05dabc 453 if (cv && SvPOK(cv))
8fa6a409
FC		 454 ret = newSVpvn_flags(
455 CvPROTO(cv), CvPROTOLEN(cv), SVs_TEMP | SvUTF8(cv)
456 );
b6c543e3 457 set:
c07a80fd 458 SETs(ret);
459 RETURN;
460}
461
a0d0e21e
LW		 462PP(pp_anoncode)
463{
97aff369 464 dVAR; dSP;
ea726b52 465 CV *cv = MUTABLE_CV(PAD_SV(PL_op->op_targ));
a5f75d66 466 if (CvCLONE(cv))
ad64d0ec 467 cv = MUTABLE_CV(sv_2mortal(MUTABLE_SV(cv_clone(cv))));
5f05dabc 468 EXTEND(SP,1);
ad64d0ec 469 PUSHs(MUTABLE_SV(cv));
a0d0e21e
LW		 470 RETURN;
471}
472
473PP(pp_srefgen)
79072805 474{
97aff369 475 dVAR; dSP;
71be2cbc 476 *SP = refto(*SP);
79072805 477 RETURN;
8ec5e241 478}
a0d0e21e
LW		 479
480PP(pp_refgen)
481{
97aff369 482 dVAR; dSP; dMARK;
a0d0e21e 483 if (GIMME != G_ARRAY) {
5f0b1d4e
GS		 484 if (++MARK <= SP)
485 *MARK = *SP;
486 else
3280af22 487 *MARK = &PL_sv_undef;
5f0b1d4e
GS		 488 *MARK = refto(*MARK);
489 SP = MARK;
490 RETURN;
a0d0e21e 491 }
bbce6d69 492 EXTEND_MORTAL(SP - MARK);
71be2cbc 493 while (++MARK <= SP)
494 *MARK = refto(*MARK);
a0d0e21e 495 RETURN;
79072805
LW		 496}
497
76e3520e 498STATIC SV*
cea2e8a9 499S_refto(pTHX_ SV *sv)
71be2cbc 500{
97aff369 501 dVAR;
71be2cbc 502 SV* rv;
503
7918f24d
NC		 504 PERL_ARGS_ASSERT_REFTO;
505
71be2cbc 506 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
507 if (LvTARGLEN(sv))
68dc0745 508 vivify_defelem(sv);
509 if (!(sv = LvTARG(sv)))
3280af22 510 sv = &PL_sv_undef;
0dd88869 511 else
b37c2d43 512 SvREFCNT_inc_void_NN(sv);
71be2cbc 513 }
d8b46c1b 514 else if (SvTYPE(sv) == SVt_PVAV) {
502c6561
NC		 515 if (!AvREAL((const AV *)sv) && AvREIFY((const AV *)sv))
516 av_reify(MUTABLE_AV(sv));
d8b46c1b 517 SvTEMP_off(sv);
b37c2d43 518 SvREFCNT_inc_void_NN(sv);
d8b46c1b 519 }
f2933f5f
DM		 520 else if (SvPADTMP(sv) && !IS_PADGV(sv))
521 sv = newSVsv(sv);
71be2cbc 522 else {
523 SvTEMP_off(sv);
b37c2d43 524 SvREFCNT_inc_void_NN(sv);
71be2cbc 525 }
526 rv = sv_newmortal();
4df7f6af 527 sv_upgrade(rv, SVt_IV);
b162af07 528 SvRV_set(rv, sv);
71be2cbc 529 SvROK_on(rv);
530 return rv;
531}
532
79072805
LW		 533PP(pp_ref)
534{
97aff369 535 dVAR; dSP; dTARGET;
1b6737cc 536 SV * const sv = POPs;
f12c7020 537
5b295bef
RD		 538 if (sv)
539 SvGETMAGIC(sv);
f12c7020 540
a0d0e21e 541 if (!sv || !SvROK(sv))
4633a7c4 542 RETPUSHNO;
79072805 543
a15456de
BF		 544 (void)sv_ref(TARG,SvRV(sv),TRUE);
545 PUSHTARG;
79072805
LW		 546 RETURN;
547}
548
549PP(pp_bless)
550{
97aff369 551 dVAR; dSP;
463ee0b2 552 HV *stash;
79072805 553
463ee0b2 554 if (MAXARG == 1)
c2f922f1 555 curstash:
11faa288 556 stash = CopSTASH(PL_curcop);
7b8d334a 557 else {
1b6737cc 558 SV * const ssv = POPs;
7b8d334a 559 STRLEN len;
e1ec3a88 560 const char *ptr;
81689caa 561
c2f922f1
FC		 562 if (!ssv) goto curstash;
563 if (!SvGMAGICAL(ssv) && !SvAMAGIC(ssv) && SvROK(ssv))
81689caa 564 Perl_croak(aTHX_ "Attempt to bless into a reference");
5c144d81 565 ptr = SvPV_const(ssv,len);
a2a5de95
NC		 566 if (len == 0)
567 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
568 "Explicit blessing to '' (assuming package main)");
e69c50fe 569 stash = gv_stashpvn(ptr, len, GV_ADD|SvUTF8(ssv));
7b8d334a 570 }
a0d0e21e 571
5d3fdfeb 572 (void)sv_bless(TOPs, stash);
79072805
LW		 573 RETURN;
574}
575
fb73857a 576PP(pp_gelem)
577{
97aff369 578 dVAR; dSP;
b13b2135 579
1b6737cc 580 SV *sv = POPs;
a180b31a
BF		 581 STRLEN len;
582 const char * const elem = SvPV_const(sv, len);
159b6efe 583 GV * const gv = MUTABLE_GV(POPs);
c445ea15 584 SV * tmpRef = NULL;
1b6737cc 585
c445ea15 586 sv = NULL;
c4ba80c3
NC		 587 if (elem) {
588 /* elem will always be NUL terminated. */
1b6737cc 589 const char * const second_letter = elem + 1;
c4ba80c3
NC		 590 switch (*elem) {
591 case 'A':
a180b31a 592 if (len == 5 && strEQ(second_letter, "RRAY"))
ad64d0ec 593 tmpRef = MUTABLE_SV(GvAV(gv));
c4ba80c3
NC		 594 break;
595 case 'C':
a180b31a 596 if (len == 4 && strEQ(second_letter, "ODE"))
ad64d0ec 597 tmpRef = MUTABLE_SV(GvCVu(gv));
c4ba80c3
NC		 598 break;
599 case 'F':
a180b31a 600 if (len == 10 && strEQ(second_letter, "ILEHANDLE")) {
c4ba80c3
NC		 601 /* finally deprecated in 5.8.0 */
602 deprecate("*glob{FILEHANDLE}");
ad64d0ec 603 tmpRef = MUTABLE_SV(GvIOp(gv));
c4ba80c3
NC		 604 }
605 else
a180b31a 606 if (len == 6 && strEQ(second_letter, "ORMAT"))
ad64d0ec 607 tmpRef = MUTABLE_SV(GvFORM(gv));
c4ba80c3
NC		 608 break;
609 case 'G':
a180b31a 610 if (len == 4 && strEQ(second_letter, "LOB"))
ad64d0ec 611 tmpRef = MUTABLE_SV(gv);
c4ba80c3
NC		 612 break;
613 case 'H':
a180b31a 614 if (len == 4 && strEQ(second_letter, "ASH"))
ad64d0ec 615 tmpRef = MUTABLE_SV(GvHV(gv));
c4ba80c3
NC		 616 break;
617 case 'I':
a180b31a 618 if (*second_letter == 'O' && !elem[2] && len == 2)
ad64d0ec 619 tmpRef = MUTABLE_SV(GvIOp(gv));
c4ba80c3
NC		 620 break;
621 case 'N':
a180b31a 622 if (len == 4 && strEQ(second_letter, "AME"))
a663657d 623 sv = newSVhek(GvNAME_HEK(gv));
c4ba80c3
NC		 624 break;
625 case 'P':
a180b31a 626 if (len == 7 && strEQ(second_letter, "ACKAGE")) {
7fa3a4ab
NC		 627 const HV * const stash = GvSTASH(gv);
628 const HEK * const hek = stash ? HvNAME_HEK(stash) : NULL;
396482e1 629 sv = hek ? newSVhek(hek) : newSVpvs("__ANON__");
c4ba80c3
NC		 630 }
631 break;
632 case 'S':
a180b31a 633 if (len == 6 && strEQ(second_letter, "CALAR"))
f9d52e31 634 tmpRef = GvSVn(gv);
c4ba80c3 635 break;
39b99f21 636 }
fb73857a 637 }
76e3520e
GS		 638 if (tmpRef)
639 sv = newRV(tmpRef);
fb73857a 640 if (sv)
641 sv_2mortal(sv);
642 else
3280af22 643 sv = &PL_sv_undef;
fb73857a 644 XPUSHs(sv);
645 RETURN;
646}
647
a0d0e21e 648/* Pattern matching */
79072805 649
a0d0e21e 650PP(pp_study)
79072805 651{
97aff369 652 dVAR; dSP; dPOPss;
a0d0e21e 653 register unsigned char *s;
a0d0e21e
LW		 654 STRLEN len;
655
a4f4e906 656 s = (unsigned char*)(SvPV(sv, len));
bc9a5256 657 if (len == 0 || len > I32_MAX || !SvPOK(sv) || SvUTF8(sv) || SvVALID(sv)) {
32f0ea87 658 /* Historically, study was skipped in these cases. */
a4f4e906
NC		 659 RETPUSHNO;
660 }
661
a58a85fa 662 /* Make study a no-op. It's no longer useful and its existence
32f0ea87 663 complicates matters elsewhere. */
1e422769 664 RETPUSHYES;
79072805
LW		 665}
666
a0d0e21e 667PP(pp_trans)
79072805 668{
97aff369 669 dVAR; dSP; dTARG;
a0d0e21e
LW		 670 SV *sv;
671
533c011a 672 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 673 sv = POPs;
59f00321
RGS		 674 else if (PL_op->op_private & OPpTARGET_MY)
675 sv = GETTARGET;
79072805 676 else {
54b9620d 677 sv = DEFSV;
a0d0e21e 678 EXTEND(SP,1);
79072805 679 }
adbc6bb1 680 TARG = sv_newmortal();
bb16bae8 681 if(PL_op->op_type == OP_TRANSR) {
290797f7
FC		 682 STRLEN len;
683 const char * const pv = SvPV(sv,len);
684 SV * const newsv = newSVpvn_flags(pv, len, SVs_TEMP|SvUTF8(sv));
bb16bae8 685 do_trans(newsv);
290797f7 686 PUSHs(newsv);
bb16bae8
FC		 687 }
688 else PUSHi(do_trans(sv));
a0d0e21e 689 RETURN;
79072805
LW		 690}
691
a0d0e21e 692/* Lvalue operators. */
79072805 693
81745e4e
NC		 694static void
695S_do_chomp(pTHX_ SV *retval, SV *sv, bool chomping)
696{
697 dVAR;
698 STRLEN len;
699 char *s;
700
701 PERL_ARGS_ASSERT_DO_CHOMP;
702
703 if (chomping && (RsSNARF(PL_rs) || RsRECORD(PL_rs)))
704 return;
705 if (SvTYPE(sv) == SVt_PVAV) {
706 I32 i;
707 AV *const av = MUTABLE_AV(sv);
708 const I32 max = AvFILL(av);
709
710 for (i = 0; i <= max; i++) {
711 sv = MUTABLE_SV(av_fetch(av, i, FALSE));
712 if (sv && ((sv = *(SV**)sv), sv != &PL_sv_undef))
713 do_chomp(retval, sv, chomping);
714 }
715 return;
716 }
717 else if (SvTYPE(sv) == SVt_PVHV) {
718 HV* const hv = MUTABLE_HV(sv);
719 HE* entry;
720 (void)hv_iterinit(hv);
721 while ((entry = hv_iternext(hv)))
722 do_chomp(retval, hv_iterval(hv,entry), chomping);
723 return;
724 }
725 else if (SvREADONLY(sv)) {
726 if (SvFAKE(sv)) {
727 /* SV is copy-on-write */
728 sv_force_normal_flags(sv, 0);
729 }
a5f4b619 730 else
81745e4e
NC		 731 Perl_croak_no_modify(aTHX);
732 }
733
734 if (PL_encoding) {
735 if (!SvUTF8(sv)) {
736 /* XXX, here sv is utf8-ized as a side-effect!
737 If encoding.pm is used properly, almost string-generating
738 operations, including literal strings, chr(), input data, etc.
739 should have been utf8-ized already, right?
740 */
741 sv_recode_to_utf8(sv, PL_encoding);
742 }
743 }
744
745 s = SvPV(sv, len);
746 if (chomping) {
747 char *temp_buffer = NULL;
748 SV *svrecode = NULL;
749
750 if (s && len) {
751 s += --len;
752 if (RsPARA(PL_rs)) {
753 if (*s != '\n')
754 goto nope;
755 ++SvIVX(retval);
756 while (len && s[-1] == '\n') {
757 --len;
758 --s;
759 ++SvIVX(retval);
760 }
761 }
762 else {
763 STRLEN rslen, rs_charlen;
764 const char *rsptr = SvPV_const(PL_rs, rslen);
765
766 rs_charlen = SvUTF8(PL_rs)
767 ? sv_len_utf8(PL_rs)
768 : rslen;
769
770 if (SvUTF8(PL_rs) != SvUTF8(sv)) {
771 /* Assumption is that rs is shorter than the scalar. */
772 if (SvUTF8(PL_rs)) {
773 /* RS is utf8, scalar is 8 bit. */
774 bool is_utf8 = TRUE;
775 temp_buffer = (char*)bytes_from_utf8((U8*)rsptr,
776 &rslen, &is_utf8);
777 if (is_utf8) {
778 /* Cannot downgrade, therefore cannot possibly match
779 */
780 assert (temp_buffer == rsptr);
781 temp_buffer = NULL;
782 goto nope;
783 }
784 rsptr = temp_buffer;
785 }
786 else if (PL_encoding) {
787 /* RS is 8 bit, encoding.pm is used.
788 * Do not recode PL_rs as a side-effect. */
789 svrecode = newSVpvn(rsptr, rslen);
790 sv_recode_to_utf8(svrecode, PL_encoding);
791 rsptr = SvPV_const(svrecode, rslen);
792 rs_charlen = sv_len_utf8(svrecode);
793 }
794 else {
795 /* RS is 8 bit, scalar is utf8. */
796 temp_buffer = (char*)bytes_to_utf8((U8*)rsptr, &rslen);
797 rsptr = temp_buffer;
798 }
799 }
800 if (rslen == 1) {
801 if (*s != *rsptr)
802 goto nope;
803 ++SvIVX(retval);
804 }
805 else {
806 if (len < rslen - 1)
807 goto nope;
808 len -= rslen - 1;
809 s -= rslen - 1;
810 if (memNE(s, rsptr, rslen))
811 goto nope;
812 SvIVX(retval) += rs_charlen;
813 }
814 }
fbac7ddf 815 s = SvPV_force_nomg_nolen(sv);
81745e4e
NC		 816 SvCUR_set(sv, len);
817 *SvEND(sv) = '\0';
818 SvNIOK_off(sv);
819 SvSETMAGIC(sv);
820 }
821 nope:
822
823 SvREFCNT_dec(svrecode);
824
825 Safefree(temp_buffer);
826 } else {
827 if (len && !SvPOK(sv))
828 s = SvPV_force_nomg(sv, len);
829 if (DO_UTF8(sv)) {
830 if (s && len) {
831 char * const send = s + len;
832 char * const start = s;
833 s = send - 1;
834 while (s > start && UTF8_IS_CONTINUATION(*s))
835 s--;
836 if (is_utf8_string((U8*)s, send - s)) {
837 sv_setpvn(retval, s, send - s);
838 *s = '\0';
839 SvCUR_set(sv, s - start);
840 SvNIOK_off(sv);
841 SvUTF8_on(retval);
842 }
843 }
844 else
845 sv_setpvs(retval, "");
846 }
847 else if (s && len) {
848 s += --len;
849 sv_setpvn(retval, s, 1);
850 *s = '\0';
851 SvCUR_set(sv, len);
852 SvUTF8_off(sv);
853 SvNIOK_off(sv);
854 }
855 else
856 sv_setpvs(retval, "");
857 SvSETMAGIC(sv);
858 }
859}
860
a0d0e21e
LW		 861PP(pp_schop)
862{
97aff369 863 dVAR; dSP; dTARGET;
fa54efae
NC		 864 const bool chomping = PL_op->op_type == OP_SCHOMP;
865
866 if (chomping)
867 sv_setiv(TARG, 0);
868 do_chomp(TARG, TOPs, chomping);
a0d0e21e
LW		 869 SETTARG;
870 RETURN;
79072805
LW		 871}
872
a0d0e21e 873PP(pp_chop)
79072805 874{
97aff369 875 dVAR; dSP; dMARK; dTARGET; dORIGMARK;
fa54efae 876 const bool chomping = PL_op->op_type == OP_CHOMP;
8ec5e241 877
fa54efae
NC		 878 if (chomping)
879 sv_setiv(TARG, 0);
20cf1f79 880 while (MARK < SP)
fa54efae 881 do_chomp(TARG, *++MARK, chomping);
20cf1f79
NC		 882 SP = ORIGMARK;
883 XPUSHTARG;
a0d0e21e 884 RETURN;
79072805
LW		 885}
886
a0d0e21e
LW		 887PP(pp_undef)
888{
97aff369 889 dVAR; dSP;
a0d0e21e
LW		 890 SV *sv;
891
533c011a 892 if (!PL_op->op_private) {
774d564b 893 EXTEND(SP, 1);
a0d0e21e 894 RETPUSHUNDEF;
774d564b 895 }
79072805 896
a0d0e21e
LW		 897 sv = POPs;
898 if (!sv)
899 RETPUSHUNDEF;
85e6fe83 900
765f542d 901 SV_CHECK_THINKFIRST_COW_DROP(sv);
85e6fe83 902
a0d0e21e
LW		 903 switch (SvTYPE(sv)) {
904 case SVt_NULL:
905 break;
906 case SVt_PVAV:
60edcf09 907 av_undef(MUTABLE_AV(sv));
a0d0e21e
LW		 908 break;
909 case SVt_PVHV:
60edcf09 910 hv_undef(MUTABLE_HV(sv));
a0d0e21e
LW		 911 break;
912 case SVt_PVCV:
a2a5de95 913 if (cv_const_sv((const CV *)sv))
714cd18f
BF		 914 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
915 "Constant subroutine %"SVf" undefined",
916 SVfARG(CvANON((const CV *)sv)
917 ? newSVpvs_flags("(anonymous)", SVs_TEMP)
918 : sv_2mortal(newSVhek(GvENAME_HEK(CvGV((const CV *)sv))))));
5f66b61c 919 /* FALLTHROUGH */
9607fc9c 920 case SVt_PVFM:
6fc92669
GS		 921 {
922 /* let user-undef'd sub keep its identity */
ea726b52
NC		 923 GV* const gv = CvGV((const CV *)sv);
924 cv_undef(MUTABLE_CV(sv));
b3f91e91 925 CvGV_set(MUTABLE_CV(sv), gv);
6fc92669 926 }
a0d0e21e 927 break;
8e07c86e 928 case SVt_PVGV:
6e592b3a 929 if (SvFAKE(sv)) {
3280af22 930 SvSetMagicSV(sv, &PL_sv_undef);
6e592b3a
BM		 931 break;
932 }
933 else if (isGV_with_GP(sv)) {
20408e3c 934 GP *gp;
dd69841b
BB		 935 HV *stash;
936
dd69841b 937 /* undef *Pkg::meth_name ... */
e530fb81
FC		 938 bool method_changed
939 = GvCVu((const GV *)sv) && (stash = GvSTASH((const GV *)sv))
940 && HvENAME_get(stash);
941 /* undef *Foo:: */
942 if((stash = GvHV((const GV *)sv))) {
943 if(HvENAME_get(stash))
944 SvREFCNT_inc_simple_void_NN(sv_2mortal((SV *)stash));
945 else stash = NULL;
946 }
dd69841b 947
159b6efe 948 gp_free(MUTABLE_GV(sv));
a02a5408 949 Newxz(gp, 1, GP);
c43ae56f 950 GvGP_set(sv, gp_ref(gp));
561b68a9 951 GvSV(sv) = newSV(0);
57843af0 952 GvLINE(sv) = CopLINE(PL_curcop);
159b6efe 953 GvEGV(sv) = MUTABLE_GV(sv);
20408e3c 954 GvMULTI_on(sv);
e530fb81
FC		 955
956 if(stash)
afdbe55d 957 mro_package_moved(NULL, stash, (const GV *)sv, 0);
e530fb81
FC		 958 stash = NULL;
959 /* undef *Foo::ISA */
960 if( strEQ(GvNAME((const GV *)sv), "ISA")
961 && (stash = GvSTASH((const GV *)sv))
962 && (method_changed || HvENAME(stash)) )
963 mro_isa_changed_in(stash);
964 else if(method_changed)
965 mro_method_changed_in(
da9043f5 966 GvSTASH((const GV *)sv)
e530fb81
FC		 967 );
968
6e592b3a 969 break;
20408e3c 970 }
6e592b3a 971 /* FALL THROUGH */
a0d0e21e 972 default:
b15aece3 973 if (SvTYPE(sv) >= SVt_PV && SvPVX_const(sv) && SvLEN(sv)) {
8bd4d4c5 974 SvPV_free(sv);
c445ea15 975 SvPV_set(sv, NULL);
4633a7c4 976 SvLEN_set(sv, 0);
a0d0e21e 977 }
0c34ef67 978 SvOK_off(sv);
4633a7c4 979 SvSETMAGIC(sv);
79072805 980 }
a0d0e21e
LW		 981
982 RETPUSHUNDEF;
79072805
LW		 983}
984
a0d0e21e
LW		 985PP(pp_postinc)
986{
97aff369 987 dVAR; dSP; dTARGET;
c22c99bc
FC		 988 const bool inc =
989 PL_op->op_type == OP_POSTINC || PL_op->op_type == OP_I_POSTINC;
60092ce4 990 if (SvTYPE(TOPs) >= SVt_PVAV || (isGV_with_GP(TOPs) && !SvFAKE(TOPs)))
6ad8f254 991 Perl_croak_no_modify(aTHX);
7dcb9b98
DM		 992 if (SvROK(TOPs))
993 TARG = sv_newmortal();
a0d0e21e 994 sv_setsv(TARG, TOPs);
3510b4a1 995 if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
c22c99bc 996 && SvIVX(TOPs) != (inc ? IV_MAX : IV_MIN))
55497cff 997 {
c22c99bc 998 SvIV_set(TOPs, SvIVX(TOPs) + (inc ? 1 : -1));
55497cff 999 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 1000 }
c22c99bc 1001 else if (inc)
6f1401dc 1002 sv_inc_nomg(TOPs);
c22c99bc 1003 else sv_dec_nomg(TOPs);
a0d0e21e 1004 SvSETMAGIC(TOPs);
1e54a23f 1005 /* special case for undef: see thread at 2003-03/msg00536.html in archive */
c22c99bc 1006 if (inc && !SvOK(TARG))
a0d0e21e
LW		 1007 sv_setiv(TARG, 0);
1008 SETs(TARG);
1009 return NORMAL;
1010}
79072805 1011
a0d0e21e
LW		 1012/* Ordinary operators. */
1013
1014PP(pp_pow)
1015{
800401ee 1016 dVAR; dSP; dATARGET; SV *svl, *svr;
58d76dfd 1017#ifdef PERL_PRESERVE_IVUV
52a96ae6
HS		 1018 bool is_int = 0;
1019#endif
6f1401dc
DM		 1020 tryAMAGICbin_MG(pow_amg, AMGf_assign|AMGf_numeric);
1021 svr = TOPs;
1022 svl = TOPm1s;
52a96ae6
HS		 1023#ifdef PERL_PRESERVE_IVUV
1024 /* For integer to integer power, we do the calculation by hand wherever
1025 we're sure it is safe; otherwise we call pow() and try to convert to
1026 integer afterwards. */
01f91bf2 1027 if (SvIV_please_nomg(svr) && SvIV_please_nomg(svl)) {
900658e3
PF		 1028 UV power;
1029 bool baseuok;
1030 UV baseuv;
1031
800401ee
JH		 1032 if (SvUOK(svr)) {
1033 power = SvUVX(svr);
900658e3 1034 } else {
800401ee 1035 const IV iv = SvIVX(svr);
900658e3
PF		 1036 if (iv >= 0) {
1037 power = iv;
1038 } else {
1039 goto float_it; /* Can't do negative powers this way. */
1040 }
1041 }
1042
800401ee 1043 baseuok = SvUOK(svl);
900658e3 1044 if (baseuok) {
800401ee 1045 baseuv = SvUVX(svl);
900658e3 1046 } else {
800401ee 1047 const IV iv = SvIVX(svl);
900658e3
PF		 1048 if (iv >= 0) {
1049 baseuv = iv;
1050 baseuok = TRUE; /* effectively it's a UV now */
1051 } else {
1052 baseuv = -iv; /* abs, baseuok == false records sign */
1053 }
1054 }
52a96ae6
HS		 1055 /* now we have integer ** positive integer. */
1056 is_int = 1;
1057
1058 /* foo & (foo - 1) is zero only for a power of 2. */
58d76dfd 1059 if (!(baseuv & (baseuv - 1))) {
52a96ae6 1060 /* We are raising power-of-2 to a positive integer.
58d76dfd
JH		 1061 The logic here will work for any base (even non-integer
1062 bases) but it can be less accurate than
1063 pow (base,power) or exp (power * log (base)) when the
1064 intermediate values start to spill out of the mantissa.
1065 With powers of 2 we know this can't happen.
1066 And powers of 2 are the favourite thing for perl
1067 programmers to notice ** not doing what they mean. */
1068 NV result = 1.0;
1069 NV base = baseuok ? baseuv : -(NV)baseuv;
900658e3
PF		 1070
1071 if (power & 1) {
1072 result *= base;
1073 }
1074 while (power >>= 1) {
1075 base *= base;
1076 if (power & 1) {
1077 result *= base;
1078 }
1079 }
58d76dfd
JH		 1080 SP--;
1081 SETn( result );
6f1401dc 1082 SvIV_please_nomg(svr);
58d76dfd 1083 RETURN;
52a96ae6
HS		 1084 } else {
1085 register unsigned int highbit = 8 * sizeof(UV);
900658e3
PF		 1086 register unsigned int diff = 8 * sizeof(UV);
1087 while (diff >>= 1) {
1088 highbit -= diff;
1089 if (baseuv >> highbit) {
1090 highbit += diff;
1091 }
52a96ae6
HS		 1092 }
1093 /* we now have baseuv < 2 ** highbit */
1094 if (power * highbit <= 8 * sizeof(UV)) {
1095 /* result will definitely fit in UV, so use UV math
1096 on same algorithm as above */
1097 register UV result = 1;
1098 register UV base = baseuv;
f2338a2e 1099 const bool odd_power = cBOOL(power & 1);
900658e3
PF		 1100 if (odd_power) {
1101 result *= base;
1102 }
1103 while (power >>= 1) {
1104 base *= base;
1105 if (power & 1) {
52a96ae6 1106 result *= base;
52a96ae6
HS		 1107 }
1108 }
1109 SP--;
0615a994 1110 if (baseuok || !odd_power)
52a96ae6
HS		 1111 /* answer is positive */
1112 SETu( result );
1113 else if (result <= (UV)IV_MAX)
1114 /* answer negative, fits in IV */
1115 SETi( -(IV)result );
1116 else if (result == (UV)IV_MIN)
1117 /* 2's complement assumption: special case IV_MIN */
1118 SETi( IV_MIN );
1119 else
1120 /* answer negative, doesn't fit */
1121 SETn( -(NV)result );
1122 RETURN;
1123 }
1124 }
58d76dfd 1125 }
52a96ae6 1126 float_it:
58d76dfd 1127#endif
a0d0e21e 1128 {
6f1401dc
DM		 1129 NV right = SvNV_nomg(svr);
1130 NV left = SvNV_nomg(svl);
4efa5a16 1131 (void)POPs;
3aaeb624
JA		 1132
1133#if defined(USE_LONG_DOUBLE) && defined(HAS_AIX_POWL_NEG_BASE_BUG)
1134 /*
1135 We are building perl with long double support and are on an AIX OS
1136 afflicted with a powl() function that wrongly returns NaNQ for any
1137 negative base. This was reported to IBM as PMR #23047-379 on
1138 03/06/2006. The problem exists in at least the following versions
1139 of AIX and the libm fileset, and no doubt others as well:
1140
1141 AIX 4.3.3-ML10 bos.adt.libm 4.3.3.50
1142 AIX 5.1.0-ML04 bos.adt.libm 5.1.0.29
1143 AIX 5.2.0 bos.adt.libm 5.2.0.85
1144
1145 So, until IBM fixes powl(), we provide the following workaround to
1146 handle the problem ourselves. Our logic is as follows: for
1147 negative bases (left), we use fmod(right, 2) to check if the
1148 exponent is an odd or even integer:
1149
1150 - if odd, powl(left, right) == -powl(-left, right)
1151 - if even, powl(left, right) == powl(-left, right)
1152
1153 If the exponent is not an integer, the result is rightly NaNQ, so
1154 we just return that (as NV_NAN).
1155 */
1156
1157 if (left < 0.0) {
1158 NV mod2 = Perl_fmod( right, 2.0 );
1159 if (mod2 == 1.0 || mod2 == -1.0) { /* odd integer */
1160 SETn( -Perl_pow( -left, right) );
1161 } else if (mod2 == 0.0) { /* even integer */
1162 SETn( Perl_pow( -left, right) );
1163 } else { /* fractional power */
1164 SETn( NV_NAN );
1165 }
1166 } else {
1167 SETn( Perl_pow( left, right) );
1168 }
1169#else
52a96ae6 1170 SETn( Perl_pow( left, right) );
3aaeb624
JA		 1171#endif /* HAS_AIX_POWL_NEG_BASE_BUG */
1172
52a96ae6
HS		 1173#ifdef PERL_PRESERVE_IVUV
1174 if (is_int)
6f1401dc 1175 SvIV_please_nomg(svr);
52a96ae6
HS		 1176#endif
1177 RETURN;
93a17b20 1178 }
a0d0e21e
LW		 1179}
1180
1181PP(pp_multiply)
1182{
800401ee 1183 dVAR; dSP; dATARGET; SV *svl, *svr;
6f1401dc
DM		 1184 tryAMAGICbin_MG(mult_amg, AMGf_assign|AMGf_numeric);
1185 svr = TOPs;
1186 svl = TOPm1s;
28e5dec8 1187#ifdef PERL_PRESERVE_IVUV
01f91bf2 1188 if (SvIV_please_nomg(svr)) {
28e5dec8
JH		 1189 /* Unless the left argument is integer in range we are going to have to
1190 use NV maths. Hence only attempt to coerce the right argument if
1191 we know the left is integer. */
1192 /* Left operand is defined, so is it IV? */
01f91bf2 1193 if (SvIV_please_nomg(svl)) {
800401ee
JH		 1194 bool auvok = SvUOK(svl);
1195 bool buvok = SvUOK(svr);
28e5dec8
JH		 1196 const UV topmask = (~ (UV)0) << (4 * sizeof (UV));
1197 const UV botmask = ~((~ (UV)0) << (4 * sizeof (UV)));
1198 UV alow;
1199 UV ahigh;
1200 UV blow;
1201 UV bhigh;
1202
1203 if (auvok) {
800401ee 1204 alow = SvUVX(svl);
28e5dec8 1205 } else {
800401ee 1206 const IV aiv = SvIVX(svl);
28e5dec8
JH		 1207 if (aiv >= 0) {
1208 alow = aiv;
1209 auvok = TRUE; /* effectively it's a UV now */
1210 } else {
1211 alow = -aiv; /* abs, auvok == false records sign */
1212 }
1213 }
1214 if (buvok) {
800401ee 1215 blow = SvUVX(svr);
28e5dec8 1216 } else {
800401ee 1217 const IV biv = SvIVX(svr);
28e5dec8
JH		 1218 if (biv >= 0) {
1219 blow = biv;
1220 buvok = TRUE; /* effectively it's a UV now */
1221 } else {
1222 blow = -biv; /* abs, buvok == false records sign */
1223 }
1224 }
1225
1226 /* If this does sign extension on unsigned it's time for plan B */
1227 ahigh = alow >> (4 * sizeof (UV));
1228 alow &= botmask;
1229 bhigh = blow >> (4 * sizeof (UV));
1230 blow &= botmask;
1231 if (ahigh && bhigh) {
6f207bd3 1232 NOOP;
28e5dec8
JH		 1233 /* eg 32 bit is at least 0x10000 * 0x10000 == 0x100000000
1234 which is overflow. Drop to NVs below. */
1235 } else if (!ahigh && !bhigh) {
1236 /* eg 32 bit is at most 0xFFFF * 0xFFFF == 0xFFFE0001
1237 so the unsigned multiply cannot overflow. */
c445ea15 1238 const UV product = alow * blow;
28e5dec8
JH		 1239 if (auvok == buvok) {
1240 /* -ve * -ve or +ve * +ve gives a +ve result. */
1241 SP--;
1242 SETu( product );
1243 RETURN;
1244 } else if (product <= (UV)IV_MIN) {
1245 /* 2s complement assumption that (UV)-IV_MIN is correct. */
1246 /* -ve result, which could overflow an IV */
1247 SP--;
25716404 1248 SETi( -(IV)product );
28e5dec8
JH		 1249 RETURN;
1250 } /* else drop to NVs below. */
1251 } else {
1252 /* One operand is large, 1 small */
1253 UV product_middle;
1254 if (bhigh) {
1255 /* swap the operands */
1256 ahigh = bhigh;
1257 bhigh = blow; /* bhigh now the temp var for the swap */
1258 blow = alow;
1259 alow = bhigh;
1260 }
1261 /* now, ((ahigh * blow) << half_UV_len) + (alow * blow)
1262 multiplies can't overflow. shift can, add can, -ve can. */
1263 product_middle = ahigh * blow;
1264 if (!(product_middle & topmask)) {
1265 /* OK, (ahigh * blow) won't lose bits when we shift it. */
1266 UV product_low;
1267 product_middle <<= (4 * sizeof (UV));
1268 product_low = alow * blow;
1269
1270 /* as for pp_add, UV + something mustn't get smaller.
1271 IIRC ANSI mandates this wrapping *behaviour* for
1272 unsigned whatever the actual representation*/
1273 product_low += product_middle;
1274 if (product_low >= product_middle) {
1275 /* didn't overflow */
1276 if (auvok == buvok) {
1277 /* -ve * -ve or +ve * +ve gives a +ve result. */
1278 SP--;
1279 SETu( product_low );
1280 RETURN;
1281 } else if (product_low <= (UV)IV_MIN) {
1282 /* 2s complement assumption again */
1283 /* -ve result, which could overflow an IV */
1284 SP--;
25716404 1285 SETi( -(IV)product_low );
28e5dec8
JH		 1286 RETURN;
1287 } /* else drop to NVs below. */
1288 }
1289 } /* product_middle too large */
1290 } /* ahigh && bhigh */
800401ee
JH		 1291 } /* SvIOK(svl) */
1292 } /* SvIOK(svr) */
28e5dec8 1293#endif
a0d0e21e 1294 {
6f1401dc
DM		 1295 NV right = SvNV_nomg(svr);
1296 NV left = SvNV_nomg(svl);
4efa5a16 1297 (void)POPs;
a0d0e21e
LW		 1298 SETn( left * right );
1299 RETURN;
79072805 1300 }
a0d0e21e
LW		 1301}
1302
1303PP(pp_divide)
1304{
800401ee 1305 dVAR; dSP; dATARGET; SV *svl, *svr;
6f1401dc
DM		 1306 tryAMAGICbin_MG(div_amg, AMGf_assign|AMGf_numeric);
1307 svr = TOPs;
1308 svl = TOPm1s;
5479d192 1309 /* Only try to do UV divide first
68795e93 1310 if ((SLOPPYDIVIDE is true) or
5479d192
NC		 1311 (PERL_PRESERVE_IVUV is true and one or both SV is a UV too large
1312 to preserve))
1313 The assumption is that it is better to use floating point divide
1314 whenever possible, only doing integer divide first if we can't be sure.
1315 If NV_PRESERVES_UV is true then we know at compile time that no UV
1316 can be too large to preserve, so don't need to compile the code to
1317 test the size of UVs. */
1318
a0d0e21e 1319#ifdef SLOPPYDIVIDE
5479d192
NC		 1320# define PERL_TRY_UV_DIVIDE
1321 /* ensure that 20./5. == 4. */
a0d0e21e 1322#else
5479d192
NC		 1323# ifdef PERL_PRESERVE_IVUV
1324# ifndef NV_PRESERVES_UV
1325# define PERL_TRY_UV_DIVIDE
1326# endif
1327# endif
a0d0e21e 1328#endif
5479d192
NC		 1329
1330#ifdef PERL_TRY_UV_DIVIDE
01f91bf2 1331 if (SvIV_please_nomg(svr) && SvIV_please_nomg(svl)) {
800401ee
JH		 1332 bool left_non_neg = SvUOK(svl);
1333 bool right_non_neg = SvUOK(svr);
5479d192
NC		 1334 UV left;
1335 UV right;
1336
1337 if (right_non_neg) {
800401ee 1338 right = SvUVX(svr);
5479d192
NC		 1339 }
1340 else {
800401ee 1341 const IV biv = SvIVX(svr);
5479d192
NC		 1342 if (biv >= 0) {
1343 right = biv;
1344 right_non_neg = TRUE; /* effectively it's a UV now */
1345 }
1346 else {
1347 right = -biv;
1348 }
1349 }
1350 /* historically undef()/0 gives a "Use of uninitialized value"
1351 warning before dieing, hence this test goes here.
1352 If it were immediately before the second SvIV_please, then
1353 DIE() would be invoked before left was even inspected, so
486ec47a 1354 no inspection would give no warning. */
5479d192
NC		 1355 if (right == 0)
1356 DIE(aTHX_ "Illegal division by zero");
1357
1358 if (left_non_neg) {
800401ee 1359 left = SvUVX(svl);
5479d192
NC		 1360 }
1361 else {
800401ee 1362 const IV aiv = SvIVX(svl);
5479d192
NC		 1363 if (aiv >= 0) {
1364 left = aiv;
1365 left_non_neg = TRUE; /* effectively it's a UV now */
1366 }
1367 else {
1368 left = -aiv;
1369 }
1370 }
1371
1372 if (left >= right
1373#ifdef SLOPPYDIVIDE
1374 /* For sloppy divide we always attempt integer division. */
1375#else
1376 /* Otherwise we only attempt it if either or both operands
1377 would not be preserved by an NV. If both fit in NVs
0c2ee62a
NC		 1378 we fall through to the NV divide code below. However,
1379 as left >= right to ensure integer result here, we know that
1380 we can skip the test on the right operand - right big
1381 enough not to be preserved can't get here unless left is
1382 also too big. */
1383
1384 && (left > ((UV)1 << NV_PRESERVES_UV_BITS))
5479d192
NC		 1385#endif
1386 ) {
1387 /* Integer division can't overflow, but it can be imprecise. */
1b6737cc 1388 const UV result = left / right;
5479d192
NC		 1389 if (result * right == left) {
1390 SP--; /* result is valid */
1391 if (left_non_neg == right_non_neg) {
1392 /* signs identical, result is positive. */
1393 SETu( result );
1394 RETURN;
1395 }
1396 /* 2s complement assumption */
1397 if (result <= (UV)IV_MIN)
91f3b821 1398 SETi( -(IV)result );
5479d192
NC		 1399 else {
1400 /* It's exact but too negative for IV. */
1401 SETn( -(NV)result );
1402 }
1403 RETURN;
1404 } /* tried integer divide but it was not an integer result */
32fdb065 1405 } /* else (PERL_ABS(result) < 1.0) or (both UVs in range for NV) */
01f91bf2 1406 } /* one operand wasn't SvIOK */
5479d192
NC		 1407#endif /* PERL_TRY_UV_DIVIDE */
1408 {
6f1401dc
DM		 1409 NV right = SvNV_nomg(svr);
1410 NV left = SvNV_nomg(svl);
4efa5a16 1411 (void)POPs;(void)POPs;
ebc6a117
PD		 1412#if defined(NAN_COMPARE_BROKEN) && defined(Perl_isnan)
1413 if (! Perl_isnan(right) && right == 0.0)
1414#else
5479d192 1415 if (right == 0.0)
ebc6a117 1416#endif
5479d192
NC		 1417 DIE(aTHX_ "Illegal division by zero");
1418 PUSHn( left / right );
1419 RETURN;
79072805 1420 }
a0d0e21e
LW		 1421}
1422
1423PP(pp_modulo)
1424{
6f1401dc
DM		 1425 dVAR; dSP; dATARGET;
1426 tryAMAGICbin_MG(modulo_amg, AMGf_assign|AMGf_numeric);
a0d0e21e 1427 {
9c5ffd7c
JH		 1428 UV left = 0;
1429 UV right = 0;
dc656993
JH		 1430 bool left_neg = FALSE;
1431 bool right_neg = FALSE;
e2c88acc
NC		 1432 bool use_double = FALSE;
1433 bool dright_valid = FALSE;
9c5ffd7c
JH		 1434 NV dright = 0.0;
1435 NV dleft = 0.0;
6f1401dc
DM		 1436 SV * const svr = TOPs;
1437 SV * const svl = TOPm1s;
01f91bf2 1438 if (SvIV_please_nomg(svr)) {
800401ee 1439 right_neg = !SvUOK(svr);
e2c88acc 1440 if (!right_neg) {
800401ee 1441 right = SvUVX(svr);
e2c88acc 1442 } else {
800401ee 1443 const IV biv = SvIVX(svr);
e2c88acc
NC		 1444 if (biv >= 0) {
1445 right = biv;
1446 right_neg = FALSE; /* effectively it's a UV now */
1447 } else {
1448 right = -biv;
1449 }
1450 }
1451 }
1452 else {
6f1401dc 1453 dright = SvNV_nomg(svr);
787eafbd
IZ		 1454 right_neg = dright < 0;
1455 if (right_neg)
1456 dright = -dright;
e2c88acc
NC		 1457 if (dright < UV_MAX_P1) {
1458 right = U_V(dright);
1459 dright_valid = TRUE; /* In case we need to use double below. */
1460 } else {
1461 use_double = TRUE;
1462 }
787eafbd 1463 }
a0d0e21e 1464
e2c88acc
NC		 1465 /* At this point use_double is only true if right is out of range for
1466 a UV. In range NV has been rounded down to nearest UV and
1467 use_double false. */
01f91bf2 1468 if (!use_double && SvIV_please_nomg(svl)) {
800401ee 1469 left_neg = !SvUOK(svl);
e2c88acc 1470 if (!left_neg) {
800401ee 1471 left = SvUVX(svl);
e2c88acc 1472 } else {
800401ee 1473 const IV aiv = SvIVX(svl);
e2c88acc
NC		 1474 if (aiv >= 0) {
1475 left = aiv;
1476 left_neg = FALSE; /* effectively it's a UV now */
1477 } else {
1478 left = -aiv;
1479 }
1480 }
e2c88acc 1481 }
787eafbd 1482 else {
6f1401dc 1483 dleft = SvNV_nomg(svl);
787eafbd
IZ		 1484 left_neg = dleft < 0;
1485 if (left_neg)
1486 dleft = -dleft;
68dc0745 1487
e2c88acc
NC		 1488 /* This should be exactly the 5.6 behaviour - if left and right are
1489 both in range for UV then use U_V() rather than floor. */
1490 if (!use_double) {
1491 if (dleft < UV_MAX_P1) {
1492 /* right was in range, so is dleft, so use UVs not double.
1493 */
1494 left = U_V(dleft);
1495 }
1496 /* left is out of range for UV, right was in range, so promote
1497 right (back) to double. */
1498 else {
1499 /* The +0.5 is used in 5.6 even though it is not strictly
1500 consistent with the implicit +0 floor in the U_V()
1501 inside the #if 1. */
1502 dleft = Perl_floor(dleft + 0.5);
1503 use_double = TRUE;
1504 if (dright_valid)
1505 dright = Perl_floor(dright + 0.5);
1506 else
1507 dright = right;
1508 }
1509 }
1510 }
6f1401dc 1511 sp -= 2;
787eafbd 1512 if (use_double) {
65202027 1513 NV dans;
787eafbd 1514
787eafbd 1515 if (!dright)
cea2e8a9 1516 DIE(aTHX_ "Illegal modulus zero");
787eafbd 1517
65202027 1518 dans = Perl_fmod(dleft, dright);
787eafbd
IZ		 1519 if ((left_neg != right_neg) && dans)
1520 dans = dright - dans;
1521 if (right_neg)
1522 dans = -dans;
1523 sv_setnv(TARG, dans);
1524 }
1525 else {
1526 UV ans;
1527
787eafbd 1528 if (!right)
cea2e8a9 1529 DIE(aTHX_ "Illegal modulus zero");
787eafbd
IZ		 1530
1531 ans = left % right;
1532 if ((left_neg != right_neg) && ans)
1533 ans = right - ans;
1534 if (right_neg) {
1535 /* XXX may warn: unary minus operator applied to unsigned type */
1536 /* could change -foo to be (~foo)+1 instead */
1537 if (ans <= ~((UV)IV_MAX)+1)
1538 sv_setiv(TARG, ~ans+1);
1539 else
65202027 1540 sv_setnv(TARG, -(NV)ans);
787eafbd
IZ		 1541 }
1542 else
1543 sv_setuv(TARG, ans);
1544 }
1545 PUSHTARG;
1546 RETURN;
79072805 1547 }
a0d0e21e 1548}
79072805 1549
a0d0e21e
LW		 1550PP(pp_repeat)
1551{
6f1401dc 1552 dVAR; dSP; dATARGET;
2b573ace 1553 register IV count;
6f1401dc
DM		 1554 SV *sv;
1555
1556 if (GIMME == G_ARRAY && PL_op->op_private & OPpREPEAT_DOLIST) {
1557 /* TODO: think of some way of doing list-repeat overloading ??? */
1558 sv = POPs;
1559 SvGETMAGIC(sv);
1560 }
1561 else {
1562 tryAMAGICbin_MG(repeat_amg, AMGf_assign);
1563 sv = POPs;
1564 }
1565
2b573ace
JH		 1566 if (SvIOKp(sv)) {
1567 if (SvUOK(sv)) {
6f1401dc 1568 const UV uv = SvUV_nomg(sv);
2b573ace
JH		 1569 if (uv > IV_MAX)
1570 count = IV_MAX; /* The best we can do? */
1571 else
1572 count = uv;
1573 } else {
6f1401dc 1574 const IV iv = SvIV_nomg(sv);
2b573ace
JH		 1575 if (iv < 0)
1576 count = 0;
1577 else
1578 count = iv;
1579 }
1580 }
1581 else if (SvNOKp(sv)) {
6f1401dc 1582 const NV nv = SvNV_nomg(sv);
2b573ace
JH		 1583 if (nv < 0.0)
1584 count = 0;
1585 else
1586 count = (IV)nv;
1587 }
1588 else
6f1401dc
DM		 1589 count = SvIV_nomg(sv);
1590
533c011a 1591 if (GIMME == G_ARRAY && PL_op->op_private & OPpREPEAT_DOLIST) {
a0d0e21e 1592 dMARK;
0bd48802
AL		 1593 static const char oom_list_extend[] = "Out of memory during list extend";
1594 const I32 items = SP - MARK;
1595 const I32 max = items * count;
79072805 1596
2b573ace
JH		 1597 MEM_WRAP_CHECK_1(max, SV*, oom_list_extend);
1598 /* Did the max computation overflow? */
27d5b266 1599 if (items > 0 && max > 0 && (max < items || max < count))
2b573ace 1600 Perl_croak(aTHX_ oom_list_extend);
a0d0e21e
LW		 1601 MEXTEND(MARK, max);
1602 if (count > 1) {
1603 while (SP > MARK) {
976c8a39
JH		 1604#if 0
1605 /* This code was intended to fix 20010809.028:
1606
1607 $x = 'abcd';
1608 for (($x =~ /./g) x 2) {
1609 print chop; # "abcdabcd" expected as output.
1610 }
1611
1612 * but that change (#11635) broke this code:
1613
1614 $x = [("foo")x2]; # only one "foo" ended up in the anonlist.
1615
1616 * I can't think of a better fix that doesn't introduce
1617 * an efficiency hit by copying the SVs. The stack isn't
1618 * refcounted, and mortalisation obviously doesn't
1619 * Do The Right Thing when the stack has more than
1620 * one pointer to the same mortal value.
1621 * .robin.
1622 */
e30acc16
RH		 1623 if (*SP) {
1624 *SP = sv_2mortal(newSVsv(*SP));
1625 SvREADONLY_on(*SP);
1626 }
976c8a39
JH		 1627#else
1628 if (*SP)
1629 SvTEMP_off((*SP));
1630#endif
a0d0e21e 1631 SP--;
79072805 1632 }
a0d0e21e
LW		 1633 MARK++;
1634 repeatcpy((char*)(MARK + items), (char*)MARK,
ad64d0ec 1635 items * sizeof(const SV *), count - 1);
a0d0e21e 1636 SP += max;
79072805 1637 }
a0d0e21e
LW		 1638 else if (count <= 0)
1639 SP -= items;
79072805 1640 }
a0d0e21e 1641 else { /* Note: mark already snarfed by pp_list */
0bd48802 1642 SV * const tmpstr = POPs;
a0d0e21e 1643 STRLEN len;
9b877dbb 1644 bool isutf;
2b573ace
JH		 1645 static const char oom_string_extend[] =
1646 "Out of memory during string extend";
a0d0e21e 1647
6f1401dc
DM		 1648 if (TARG != tmpstr)
1649 sv_setsv_nomg(TARG, tmpstr);
1650 SvPV_force_nomg(TARG, len);
9b877dbb 1651 isutf = DO_UTF8(TARG);
8ebc5c01 1652 if (count != 1) {
1653 if (count < 1)
1654 SvCUR_set(TARG, 0);
1655 else {
c445ea15 1656 const STRLEN max = (UV)count * len;
19a94d75 1657 if (len > MEM_SIZE_MAX / count)
2b573ace
JH		 1658 Perl_croak(aTHX_ oom_string_extend);
1659 MEM_WRAP_CHECK_1(max, char, oom_string_extend);
8569b9dc 1660 SvGROW(TARG, max + 1);
a0d0e21e 1661 repeatcpy(SvPVX(TARG) + len, SvPVX(TARG), len, count - 1);
b162af07 1662 SvCUR_set(TARG, SvCUR(TARG) * count);
7a4c00b4 1663 }
a0d0e21e 1664 *SvEND(TARG) = '\0';
a0d0e21e 1665 }
dfcb284a
GS		 1666 if (isutf)
1667 (void)SvPOK_only_UTF8(TARG);
1668 else
1669 (void)SvPOK_only(TARG);
b80b6069
RH		 1670
1671 if (PL_op->op_private & OPpREPEAT_DOLIST) {
1672 /* The parser saw this as a list repeat, and there
1673 are probably several items on the stack. But we're
1674 in scalar context, and there's no pp_list to save us
1675 now. So drop the rest of the items -- robin@kitsite.com
1676 */
1677 dMARK;
1678 SP = MARK;
1679 }
a0d0e21e 1680 PUSHTARG;
79072805 1681 }
a0d0e21e
LW		 1682 RETURN;
1683}
79072805 1684
a0d0e21e
LW		 1685PP(pp_subtract)
1686{
800401ee 1687 dVAR; dSP; dATARGET; bool useleft; SV *svl, *svr;
6f1401dc
DM		 1688 tryAMAGICbin_MG(subtr_amg, AMGf_assign|AMGf_numeric);
1689 svr = TOPs;
1690 svl = TOPm1s;
800401ee 1691 useleft = USE_LEFT(svl);
28e5dec8 1692#ifdef PERL_PRESERVE_IVUV
7dca457a
NC		 1693 /* See comments in pp_add (in pp_hot.c) about Overflow, and how
1694 "bad things" happen if you rely on signed integers wrapping. */
01f91bf2 1695 if (SvIV_please_nomg(svr)) {
28e5dec8
JH		 1696 /* Unless the left argument is integer in range we are going to have to
1697 use NV maths. Hence only attempt to coerce the right argument if
1698 we know the left is integer. */
9c5ffd7c
JH		 1699 register UV auv = 0;
1700 bool auvok = FALSE;
7dca457a
NC		 1701 bool a_valid = 0;
1702
28e5dec8 1703 if (!useleft) {
7dca457a
NC		 1704 auv = 0;
1705 a_valid = auvok = 1;
1706 /* left operand is undef, treat as zero. */
28e5dec8
JH		 1707 } else {
1708 /* Left operand is defined, so is it IV? */
01f91bf2 1709 if (SvIV_please_nomg(svl)) {
800401ee
JH		 1710 if ((auvok = SvUOK(svl)))
1711 auv = SvUVX(svl);
7dca457a 1712 else {
800401ee 1713 register const IV aiv = SvIVX(svl);
7dca457a
NC		 1714 if (aiv >= 0) {
1715 auv = aiv;
1716 auvok = 1; /* Now acting as a sign flag. */
1717 } else { /* 2s complement assumption for IV_MIN */
1718 auv = (UV)-aiv;
28e5dec8 1719 }
7dca457a
NC		 1720 }
1721 a_valid = 1;
1722 }
1723 }
1724 if (a_valid) {
1725 bool result_good = 0;
1726 UV result;
1727 register UV buv;
800401ee 1728 bool buvok = SvUOK(svr);
9041c2e3 1729
7dca457a 1730 if (buvok)
800401ee 1731 buv = SvUVX(svr);
7dca457a 1732 else {
800401ee 1733 register const IV biv = SvIVX(svr);
7dca457a
NC		 1734 if (biv >= 0) {
1735 buv = biv;
1736 buvok = 1;
1737 } else
1738 buv = (UV)-biv;
1739 }
1740 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 1741 else "IV" now, independent of how it came in.
7dca457a
NC		 1742 if a, b represents positive, A, B negative, a maps to -A etc
1743 a - b => (a - b)
1744 A - b => -(a + b)
1745 a - B => (a + b)
1746 A - B => -(a - b)
1747 all UV maths. negate result if A negative.
1748 subtract if signs same, add if signs differ. */
1749
1750 if (auvok ^ buvok) {
1751 /* Signs differ. */
1752 result = auv + buv;
1753 if (result >= auv)
1754 result_good = 1;
1755 } else {
1756 /* Signs same */
1757 if (auv >= buv) {
1758 result = auv - buv;
1759 /* Must get smaller */
1760 if (result <= auv)
1761 result_good = 1;
1762 } else {
1763 result = buv - auv;
1764 if (result <= buv) {
1765 /* result really should be -(auv-buv). as its negation
1766 of true value, need to swap our result flag */
1767 auvok = !auvok;
1768 result_good = 1;
28e5dec8 1769 }
28e5dec8
JH		 1770 }
1771 }
7dca457a
NC		 1772 if (result_good) {
1773 SP--;
1774 if (auvok)
1775 SETu( result );
1776 else {
1777 /* Negate result */
1778 if (result <= (UV)IV_MIN)
1779 SETi( -(IV)result );
1780 else {
1781 /* result valid, but out of range for IV. */
1782 SETn( -(NV)result );
1783 }
1784 }
1785 RETURN;
1786 } /* Overflow, drop through to NVs. */
28e5dec8
JH		 1787 }
1788 }
1789#endif
a0d0e21e 1790 {
6f1401dc 1791 NV value = SvNV_nomg(svr);
4efa5a16
RD		 1792 (void)POPs;
1793
28e5dec8
JH		 1794 if (!useleft) {
1795 /* left operand is undef, treat as zero - value */
1796 SETn(-value);
1797 RETURN;
1798 }
6f1401dc 1799 SETn( SvNV_nomg(svl) - value );
28e5dec8 1800 RETURN;
79072805 1801 }
a0d0e21e 1802}
79072805 1803
a0d0e21e
LW		 1804PP(pp_left_shift)
1805{
6f1401dc 1806 dVAR; dSP; dATARGET; SV *svl, *svr;
a42d0242 1807 tryAMAGICbin_MG(lshift_amg, AMGf_assign|AMGf_numeric);
6f1401dc
DM		 1808 svr = POPs;
1809 svl = TOPs;
a0d0e21e 1810 {
6f1401dc 1811 const IV shift = SvIV_nomg(svr);
d0ba1bd2 1812 if (PL_op->op_private & HINT_INTEGER) {
6f1401dc 1813 const IV i = SvIV_nomg(svl);
972b05a9 1814 SETi(i << shift);
d0ba1bd2
JH		 1815 }
1816 else {
6f1401dc 1817 const UV u = SvUV_nomg(svl);
972b05a9 1818 SETu(u << shift);
d0ba1bd2 1819 }
55497cff 1820 RETURN;
79072805 1821 }
a0d0e21e 1822}
79072805 1823
a0d0e21e
LW		 1824PP(pp_right_shift)
1825{
6f1401dc 1826 dVAR; dSP; dATARGET; SV *svl, *svr;
a42d0242 1827 tryAMAGICbin_MG(rshift_amg, AMGf_assign|AMGf_numeric);
6f1401dc
DM		 1828 svr = POPs;
1829 svl = TOPs;
a0d0e21e 1830 {
6f1401dc 1831 const IV shift = SvIV_nomg(svr);
d0ba1bd2 1832 if (PL_op->op_private & HINT_INTEGER) {
6f1401dc 1833 const IV i = SvIV_nomg(svl);
972b05a9 1834 SETi(i >> shift);
d0ba1bd2
JH		 1835 }
1836 else {
6f1401dc 1837 const UV u = SvUV_nomg(svl);
972b05a9 1838 SETu(u >> shift);
d0ba1bd2 1839 }
a0d0e21e 1840 RETURN;
93a17b20 1841 }
79072805
LW		 1842}
1843
a0d0e21e 1844PP(pp_lt)
79072805 1845{
6f1401dc 1846 dVAR; dSP;
33efebe6
DM		 1847 SV *left, *right;
1848
a42d0242 1849 tryAMAGICbin_MG(lt_amg, AMGf_set|AMGf_numeric);
33efebe6
DM		 1850 right = POPs;
1851 left = TOPs;
1852 SETs(boolSV(
1853 (SvIOK_notUV(left) && SvIOK_notUV(right))
1854 ? (SvIVX(left) < SvIVX(right))
1855 : (do_ncmp(left, right) == -1)
1856 ));
1857 RETURN;
a0d0e21e 1858}
79072805 1859
a0d0e21e
LW		 1860PP(pp_gt)
1861{
6f1401dc 1862 dVAR; dSP;
33efebe6 1863 SV *left, *right;
1b6737cc 1864
33efebe6
DM		 1865 tryAMAGICbin_MG(gt_amg, AMGf_set|AMGf_numeric);
1866 right = POPs;
1867 left = TOPs;
1868 SETs(boolSV(
1869 (SvIOK_notUV(left) && SvIOK_notUV(right))
1870 ? (SvIVX(left) > SvIVX(right))
1871 : (do_ncmp(left, right) == 1)
1872 ));
1873 RETURN;
a0d0e21e
LW		 1874}
1875
1876PP(pp_le)
1877{
6f1401dc 1878 dVAR; dSP;
33efebe6 1879 SV *left, *right;
1b6737cc 1880
33efebe6
DM		 1881 tryAMAGICbin_MG(le_amg, AMGf_set|AMGf_numeric);
1882 right = POPs;
1883 left = TOPs;
1884 SETs(boolSV(
1885 (SvIOK_notUV(left) && SvIOK_notUV(right))
1886 ? (SvIVX(left) <= SvIVX(right))
1887 : (do_ncmp(left, right) <= 0)
1888 ));
1889 RETURN;
a0d0e21e
LW		 1890}
1891
1892PP(pp_ge)
1893{
6f1401dc 1894 dVAR; dSP;
33efebe6
DM		 1895 SV *left, *right;
1896
1897 tryAMAGICbin_MG(ge_amg, AMGf_set|AMGf_numeric);
1898 right = POPs;
1899 left = TOPs;
1900 SETs(boolSV(
1901 (SvIOK_notUV(left) && SvIOK_notUV(right))
1902 ? (SvIVX(left) >= SvIVX(right))
1903 : ( (do_ncmp(left, right) & 2) == 0)
1904 ));
1905 RETURN;
1906}
1b6737cc 1907
33efebe6
DM		 1908PP(pp_ne)
1909{
1910 dVAR; dSP;
1911 SV *left, *right;
1912
1913 tryAMAGICbin_MG(ne_amg, AMGf_set|AMGf_numeric);
1914 right = POPs;
1915 left = TOPs;
1916 SETs(boolSV(
1917 (SvIOK_notUV(left) && SvIOK_notUV(right))
1918 ? (SvIVX(left) != SvIVX(right))
1919 : (do_ncmp(left, right) != 0)
1920 ));
1921 RETURN;
1922}
1b6737cc 1923
33efebe6
DM		 1924/* compare left and right SVs. Returns:
1925 * -1: <
1926 * 0: ==
1927 * 1: >
1928 * 2: left or right was a NaN
1929 */
1930I32
1931Perl_do_ncmp(pTHX_ SV* const left, SV * const right)
1932{
1933 dVAR;
1b6737cc 1934
33efebe6
DM		 1935 PERL_ARGS_ASSERT_DO_NCMP;
1936#ifdef PERL_PRESERVE_IVUV
33efebe6 1937 /* Fortunately it seems NaN isn't IOK */
01f91bf2 1938 if (SvIV_please_nomg(right) && SvIV_please_nomg(left)) {
33efebe6
DM		 1939 if (!SvUOK(left)) {
1940 const IV leftiv = SvIVX(left);
1941 if (!SvUOK(right)) {
1942 /* ## IV <=> IV ## */
1943 const IV rightiv = SvIVX(right);
1944 return (leftiv > rightiv) - (leftiv < rightiv);
28e5dec8 1945 }
33efebe6
DM		 1946 /* ## IV <=> UV ## */
1947 if (leftiv < 0)
1948 /* As (b) is a UV, it's >=0, so it must be < */
1949 return -1;
1950 {
1951 const UV rightuv = SvUVX(right);
1952 return ((UV)leftiv > rightuv) - ((UV)leftiv < rightuv);
28e5dec8 1953 }
28e5dec8 1954 }
79072805 1955
33efebe6
DM		 1956 if (SvUOK(right)) {
1957 /* ## UV <=> UV ## */
1958 const UV leftuv = SvUVX(left);
1959 const UV rightuv = SvUVX(right);
1960 return (leftuv > rightuv) - (leftuv < rightuv);
28e5dec8 1961 }
33efebe6
DM		 1962 /* ## UV <=> IV ## */
1963 {
1964 const IV rightiv = SvIVX(right);
1965 if (rightiv < 0)
1966 /* As (a) is a UV, it's >=0, so it cannot be < */
1967 return 1;
1968 {
1969 const UV leftuv = SvUVX(left);
1970 return (leftuv > (UV)rightiv) - (leftuv < (UV)rightiv);
28e5dec8 1971 }
28e5dec8 1972 }
118e2215 1973 assert(0); /* NOTREACHED */
28e5dec8
JH		 1974 }
1975#endif
a0d0e21e 1976 {
33efebe6
DM		 1977 NV const rnv = SvNV_nomg(right);
1978 NV const lnv = SvNV_nomg(left);
1979
cab190d4 1980#if defined(NAN_COMPARE_BROKEN) && defined(Perl_isnan)
33efebe6
DM		 1981 if (Perl_isnan(lnv) || Perl_isnan(rnv)) {
1982 return 2;
1983 }
1984 return (lnv > rnv) - (lnv < rnv);
cab190d4 1985#else
33efebe6
DM		 1986 if (lnv < rnv)
1987 return -1;
1988 if (lnv > rnv)
1989 return 1;
1990 if (lnv == rnv)
1991 return 0;
1992 return 2;
cab190d4 1993#endif
a0d0e21e 1994 }
79072805
LW		 1995}
1996
33efebe6 1997
a0d0e21e 1998PP(pp_ncmp)
79072805 1999{
33efebe6
DM		 2000 dVAR; dSP;
2001 SV *left, *right;
2002 I32 value;
a42d0242 2003 tryAMAGICbin_MG(ncmp_amg, AMGf_numeric);
33efebe6
DM		 2004 right = POPs;
2005 left = TOPs;
2006 value = do_ncmp(left, right);
2007 if (value == 2) {
3280af22 2008 SETs(&PL_sv_undef);
79072805 2009 }
33efebe6
DM		 2010 else {
2011 dTARGET;
2012 SETi(value);
2013 }
2014 RETURN;
a0d0e21e 2015}
79072805 2016
afd9910b 2017PP(pp_sle)
a0d0e21e 2018{
97aff369 2019 dVAR; dSP;
79072805 2020
afd9910b
NC		 2021 int amg_type = sle_amg;
2022 int multiplier = 1;
2023 int rhs = 1;
79072805 2024
afd9910b
NC		 2025 switch (PL_op->op_type) {
2026 case OP_SLT:
2027 amg_type = slt_amg;
2028 /* cmp < 0 */
2029 rhs = 0;
2030 break;
2031 case OP_SGT:
2032 amg_type = sgt_amg;
2033 /* cmp > 0 */
2034 multiplier = -1;
2035 rhs = 0;
2036 break;
2037 case OP_SGE:
2038 amg_type = sge_amg;
2039 /* cmp >= 0 */
2040 multiplier = -1;
2041 break;
79072805 2042 }
79072805 2043
6f1401dc 2044 tryAMAGICbin_MG(amg_type, AMGf_set);
a0d0e21e
LW		 2045 {
2046 dPOPTOPssrl;
1b6737cc 2047 const int cmp = (IN_LOCALE_RUNTIME
078504b2
FC		 2048 ? sv_cmp_locale_flags(left, right, 0)
2049 : sv_cmp_flags(left, right, 0));
afd9910b 2050 SETs(boolSV(cmp * multiplier < rhs));
a0d0e21e
LW		 2051 RETURN;
2052 }
2053}
79072805 2054
36477c24 2055PP(pp_seq)
2056{
6f1401dc
DM		 2057 dVAR; dSP;
2058 tryAMAGICbin_MG(seq_amg, AMGf_set);
36477c24 2059 {
2060 dPOPTOPssrl;
078504b2 2061 SETs(boolSV(sv_eq_flags(left, right, 0)));
a0d0e21e
LW		 2062 RETURN;
2063 }
2064}
79072805 2065
a0d0e21e 2066PP(pp_sne)
79072805 2067{
6f1401dc
DM		 2068 dVAR; dSP;
2069 tryAMAGICbin_MG(sne_amg, AMGf_set);
a0d0e21e
LW		 2070 {
2071 dPOPTOPssrl;
078504b2 2072 SETs(boolSV(!sv_eq_flags(left, right, 0)));
a0d0e21e 2073 RETURN;
463ee0b2 2074 }
79072805
LW		 2075}
2076
a0d0e21e 2077PP(pp_scmp)
79072805 2078{
6f1401dc
DM		 2079 dVAR; dSP; dTARGET;
2080 tryAMAGICbin_MG(scmp_amg, 0);
a0d0e21e
LW		 2081 {
2082 dPOPTOPssrl;
1b6737cc 2083 const int cmp = (IN_LOCALE_RUNTIME
078504b2
FC		 2084 ? sv_cmp_locale_flags(left, right, 0)
2085 : sv_cmp_flags(left, right, 0));
bbce6d69 2086 SETi( cmp );
a0d0e21e
LW		 2087 RETURN;
2088 }
2089}
79072805 2090
55497cff 2091PP(pp_bit_and)
2092{
6f1401dc
DM		 2093 dVAR; dSP; dATARGET;
2094 tryAMAGICbin_MG(band_amg, AMGf_assign);
a0d0e21e
LW		 2095 {
2096 dPOPTOPssrl;
4633a7c4 2097 if (SvNIOKp(left) || SvNIOKp(right)) {
b20c4ee1
FC		 2098 const bool left_ro_nonnum = !SvNIOKp(left) && SvREADONLY(left);
2099 const bool right_ro_nonnum = !SvNIOKp(right) && SvREADONLY(right);
d0ba1bd2 2100 if (PL_op->op_private & HINT_INTEGER) {
1b6737cc 2101 const IV i = SvIV_nomg(left) & SvIV_nomg(right);
972b05a9 2102 SETi(i);
d0ba1bd2
JH		 2103 }
2104 else {
1b6737cc 2105 const UV u = SvUV_nomg(left) & SvUV_nomg(right);
972b05a9 2106 SETu(u);
d0ba1bd2 2107 }
5ee80e13 2108 if (left_ro_nonnum && left != TARG) SvNIOK_off(left);
b20c4ee1 2109 if (right_ro_nonnum) SvNIOK_off(right);
a0d0e21e
LW		 2110 }
2111 else {
533c011a 2112 do_vop(PL_op->op_type, TARG, left, right);
a0d0e21e
LW		 2113 SETTARG;
2114 }
2115 RETURN;
2116 }
2117}
79072805 2118
a0d0e21e
LW		 2119PP(pp_bit_or)
2120{
3658c1f1
NC		 2121 dVAR; dSP; dATARGET;
2122 const int op_type = PL_op->op_type;
2123
6f1401dc 2124 tryAMAGICbin_MG((op_type == OP_BIT_OR ? bor_amg : bxor_amg), AMGf_assign);
a0d0e21e
LW		 2125 {
2126 dPOPTOPssrl;
4633a7c4 2127 if (SvNIOKp(left) || SvNIOKp(right)) {
b20c4ee1
FC		 2128 const bool left_ro_nonnum = !SvNIOKp(left) && SvREADONLY(left);
2129 const bool right_ro_nonnum = !SvNIOKp(right) && SvREADONLY(right);
d0ba1bd2 2130 if (PL_op->op_private & HINT_INTEGER) {
3658c1f1
NC		 2131 const IV l = (USE_LEFT(left) ? SvIV_nomg(left) : 0);
2132 const IV r = SvIV_nomg(right);
2133 const IV result = op_type == OP_BIT_OR ? (l | r) : (l ^ r);
2134 SETi(result);
d0ba1bd2
JH		 2135 }
2136 else {
3658c1f1
NC		 2137 const UV l = (USE_LEFT(left) ? SvUV_nomg(left) : 0);
2138 const UV r = SvUV_nomg(right);
2139 const UV result = op_type == OP_BIT_OR ? (l | r) : (l ^ r);
2140 SETu(result);
d0ba1bd2 2141 }
5ee80e13 2142 if (left_ro_nonnum && left != TARG) SvNIOK_off(left);
b20c4ee1 2143 if (right_ro_nonnum) SvNIOK_off(right);
a0d0e21e
LW		 2144 }
2145 else {
3658c1f1 2146 do_vop(op_type, TARG, left, right);
a0d0e21e
LW		 2147 SETTARG;
2148 }
2149 RETURN;
79072805 2150 }
a0d0e21e 2151}
79072805 2152
a0d0e21e
LW		 2153PP(pp_negate)
2154{
6f1401dc
DM		 2155 dVAR; dSP; dTARGET;
2156 tryAMAGICun_MG(neg_amg, AMGf_numeric);
a0d0e21e 2157 {
6f1401dc 2158 SV * const sv = TOPs;
a5b92898 2159
7dbe3150
FC		 2160 if (SvIOK(sv) || (SvGMAGICAL(sv) && SvIOKp(sv))) {
2161 /* It's publicly an integer */
28e5dec8 2162 oops_its_an_int:
9b0e499b
GS		 2163 if (SvIsUV(sv)) {
2164 if (SvIVX(sv) == IV_MIN) {
28e5dec8 2165 /* 2s complement assumption. */
9b0e499b
GS		 2166 SETi(SvIVX(sv)); /* special case: -((UV)IV_MAX+1) == IV_MIN */
2167 RETURN;
2168 }
2169 else if (SvUVX(sv) <= IV_MAX) {
beccb14c 2170 SETi(-SvIVX(sv));
9b0e499b
GS		 2171 RETURN;
2172 }
2173 }
2174 else if (SvIVX(sv) != IV_MIN) {
2175 SETi(-SvIVX(sv));
2176 RETURN;
2177 }
28e5dec8
JH		 2178#ifdef PERL_PRESERVE_IVUV
2179 else {
2180 SETu((UV)IV_MIN);
2181 RETURN;
2182 }
2183#endif
9b0e499b 2184 }
8a5decd8 2185 if (SvNIOKp(sv) && (SvNIOK(sv) || !SvPOK(sv)))
6f1401dc 2186 SETn(-SvNV_nomg(sv));
4633a7c4 2187 else if (SvPOKp(sv)) {
a0d0e21e 2188 STRLEN len;
6f1401dc 2189 const char * const s = SvPV_nomg_const(sv, len);
bbce6d69 2190 if (isIDFIRST(*s)) {
76f68e9b 2191 sv_setpvs(TARG, "-");
a0d0e21e 2192 sv_catsv(TARG, sv);
79072805 2193 }
288163b0 2194 else if (*s == '+' || (*s == '-' && !looks_like_number(sv))) {
6f1401dc
DM		 2195 sv_setsv_nomg(TARG, sv);
2196 *SvPV_force_nomg(TARG, len) = *s == '-' ? '+' : '-';
79072805 2197 }
288163b0 2198 else if (SvIV_please_nomg(sv))
8eb28a70 2199 goto oops_its_an_int;
288163b0 2200 else
6f1401dc 2201 sv_setnv(TARG, -SvNV_nomg(sv));
a0d0e21e 2202 SETTARG;
79072805 2203 }
4633a7c4 2204 else
6f1401dc 2205 SETn(-SvNV_nomg(sv));
79072805 2206 }
a0d0e21e 2207 RETURN;
79072805
LW		 2208}
2209
a0d0e21e 2210PP(pp_not)
79072805 2211{
6f1401dc
DM		 2212 dVAR; dSP;
2213 tryAMAGICun_MG(not_amg, AMGf_set);
06c841cf 2214 *PL_stack_sp = boolSV(!SvTRUE_nomg(*PL_stack_sp));
a0d0e21e 2215 return NORMAL;
79072805
LW		 2216}
2217
a0d0e21e 2218PP(pp_complement)
79072805 2219{
6f1401dc 2220 dVAR; dSP; dTARGET;
a42d0242 2221 tryAMAGICun_MG(compl_amg, AMGf_numeric);
a0d0e21e
LW		 2222 {
2223 dTOPss;
4633a7c4 2224 if (SvNIOKp(sv)) {
d0ba1bd2 2225 if (PL_op->op_private & HINT_INTEGER) {
1b6737cc 2226 const IV i = ~SvIV_nomg(sv);
972b05a9 2227 SETi(i);
d0ba1bd2
JH		 2228 }
2229 else {
1b6737cc 2230 const UV u = ~SvUV_nomg(sv);
972b05a9 2231 SETu(u);
d0ba1bd2 2232 }
a0d0e21e
LW		 2233 }
2234 else {
51723571 2235 register U8 *tmps;
55497cff 2236 register I32 anum;
a0d0e21e
LW		 2237 STRLEN len;
2238
10516c54 2239 (void)SvPV_nomg_const(sv,len); /* force check for uninit var */
891f9566 2240 sv_setsv_nomg(TARG, sv);
6f1401dc 2241 tmps = (U8*)SvPV_force_nomg(TARG, len);
a0d0e21e 2242 anum = len;
1d68d6cd 2243 if (SvUTF8(TARG)) {
a1ca4561 2244 /* Calculate exact length, let's not estimate. */
1d68d6cd 2245 STRLEN targlen = 0;
ba210ebe 2246 STRLEN l;
a1ca4561
YST		 2247 UV nchar = 0;
2248 UV nwide = 0;
01f6e806 2249 U8 * const send = tmps + len;
74d49cd0
TS		 2250 U8 * const origtmps = tmps;
2251 const UV utf8flags = UTF8_ALLOW_ANYUV;
1d68d6cd 2252
1d68d6cd 2253 while (tmps < send) {
74d49cd0
TS		 2254 const UV c = utf8n_to_uvchr(tmps, send-tmps, &l, utf8flags);
2255 tmps += l;
5bbb0b5a 2256 targlen += UNISKIP(~c);
a1ca4561
YST		 2257 nchar++;
2258 if (c > 0xff)
2259 nwide++;
1d68d6cd
SC		 2260 }
2261
2262 /* Now rewind strings and write them. */
74d49cd0 2263 tmps = origtmps;
a1ca4561
YST		 2264
2265 if (nwide) {
01f6e806
AL		 2266 U8 *result;
2267 U8 *p;
2268
74d49cd0 2269 Newx(result, targlen + 1, U8);
01f6e806 2270 p = result;
a1ca4561 2271 while (tmps < send) {
74d49cd0
TS		 2272 const UV c = utf8n_to_uvchr(tmps, send-tmps, &l, utf8flags);
2273 tmps += l;
01f6e806 2274 p = uvchr_to_utf8_flags(p, ~c, UNICODE_ALLOW_ANY);
a1ca4561 2275 }
01f6e806 2276 *p = '\0';
c1c21316
NC		 2277 sv_usepvn_flags(TARG, (char*)result, targlen,
2278 SV_HAS_TRAILING_NUL);
a1ca4561
YST		 2279 SvUTF8_on(TARG);
2280 }
2281 else {
01f6e806
AL		 2282 U8 *result;
2283 U8 *p;
2284
74d49cd0 2285 Newx(result, nchar + 1, U8);
01f6e806 2286 p = result;
a1ca4561 2287 while (tmps < send) {
74d49cd0
TS		 2288 const U8 c = (U8)utf8n_to_uvchr(tmps, send-tmps, &l, utf8flags);
2289 tmps += l;
01f6e806 2290 *p++ = ~c;
a1ca4561 2291 }
01f6e806 2292 *p = '\0';
c1c21316 2293 sv_usepvn_flags(TARG, (char*)result, nchar, SV_HAS_TRAILING_NUL);
d0a21e00 2294 SvUTF8_off(TARG);
1d68d6cd 2295 }
ec93b65f 2296 SETTARG;
1d68d6cd
SC		 2297 RETURN;
2298 }
a0d0e21e 2299#ifdef LIBERAL
51723571
JH		 2300 {
2301 register long *tmpl;
2302 for ( ; anum && (unsigned long)tmps % sizeof(long); anum--, tmps++)
2303 *tmps = ~*tmps;
2304 tmpl = (long*)tmps;
bb7a0f54 2305 for ( ; anum >= (I32)sizeof(long); anum -= (I32)sizeof(long), tmpl++)
51723571
JH		 2306 *tmpl = ~*tmpl;
2307 tmps = (U8*)tmpl;
2308 }
a0d0e21e
LW		 2309#endif
2310 for ( ; anum > 0; anum--, tmps++)
2311 *tmps = ~*tmps;
ec93b65f 2312 SETTARG;
a0d0e21e
LW		 2313 }
2314 RETURN;
2315 }
79072805
LW		 2316}
2317
a0d0e21e
LW		 2318/* integer versions of some of the above */
2319
a0d0e21e 2320PP(pp_i_multiply)
79072805 2321{
6f1401dc
DM		 2322 dVAR; dSP; dATARGET;
2323 tryAMAGICbin_MG(mult_amg, AMGf_assign);
a0d0e21e 2324 {
6f1401dc 2325 dPOPTOPiirl_nomg;
a0d0e21e
LW		 2326 SETi( left * right );
2327 RETURN;
2328 }
79072805
LW		 2329}
2330
a0d0e21e 2331PP(pp_i_divide)
79072805 2332{
85935d8e 2333 IV num;
6f1401dc
DM		 2334 dVAR; dSP; dATARGET;
2335 tryAMAGICbin_MG(div_amg, AMGf_assign);
a0d0e21e 2336 {
6f1401dc 2337 dPOPTOPssrl;
85935d8e 2338 IV value = SvIV_nomg(right);
a0d0e21e 2339 if (value == 0)
ece1bcef 2340 DIE(aTHX_ "Illegal division by zero");
85935d8e 2341 num = SvIV_nomg(left);
a0cec769
YST		 2342
2343 /* avoid FPE_INTOVF on some platforms when num is IV_MIN */
2344 if (value == -1)
2345 value = - num;
2346 else
2347 value = num / value;
6f1401dc 2348 SETi(value);
a0d0e21e
LW		 2349 RETURN;
2350 }
79072805
LW		 2351}
2352
befad5d1 2353#if defined(__GLIBC__) && IVSIZE == 8
224ec323
JH		 2354STATIC
2355PP(pp_i_modulo_0)
befad5d1
NC		 2356#else
2357PP(pp_i_modulo)
2358#endif
224ec323
JH		 2359{
2360 /* This is the vanilla old i_modulo. */
6f1401dc
DM		 2361 dVAR; dSP; dATARGET;
2362 tryAMAGICbin_MG(modulo_amg, AMGf_assign);
224ec323 2363 {
6f1401dc 2364 dPOPTOPiirl_nomg;
224ec323
JH		 2365 if (!right)
2366 DIE(aTHX_ "Illegal modulus zero");
a0cec769
YST		 2367 /* avoid FPE_INTOVF on some platforms when left is IV_MIN */
2368 if (right == -1)
2369 SETi( 0 );
2370 else
2371 SETi( left % right );
224ec323
JH		 2372 RETURN;
2373 }
2374}
2375
11010fa3 2376#if defined(__GLIBC__) && IVSIZE == 8
224ec323
JH		 2377STATIC
2378PP(pp_i_modulo_1)
befad5d1 2379
224ec323 2380{
224ec323 2381 /* This is the i_modulo with the workaround for the _moddi3 bug
fce2b89e 2382 * in (at least) glibc 2.2.5 (the PERL_ABS() the workaround).
224ec323 2383 * See below for pp_i_modulo. */
6f1401dc
DM		 2384 dVAR; dSP; dATARGET;
2385 tryAMAGICbin_MG(modulo_amg, AMGf_assign);
224ec323 2386 {
6f1401dc 2387 dPOPTOPiirl_nomg;
224ec323
JH		 2388 if (!right)
2389 DIE(aTHX_ "Illegal modulus zero");
a0cec769
YST		 2390 /* avoid FPE_INTOVF on some platforms when left is IV_MIN */
2391 if (right == -1)
2392 SETi( 0 );
2393 else
2394 SETi( left % PERL_ABS(right) );
224ec323
JH		 2395 RETURN;
2396 }
224ec323
JH		 2397}
2398
a0d0e21e 2399PP(pp_i_modulo)
79072805 2400{
6f1401dc
DM		 2401 dVAR; dSP; dATARGET;
2402 tryAMAGICbin_MG(modulo_amg, AMGf_assign);
224ec323 2403 {
6f1401dc 2404 dPOPTOPiirl_nomg;
224ec323
JH		 2405 if (!right)
2406 DIE(aTHX_ "Illegal modulus zero");
2407 /* The assumption is to use hereafter the old vanilla version... */
2408 PL_op->op_ppaddr =
2409 PL_ppaddr[OP_I_MODULO] =
1c127fab 2410 Perl_pp_i_modulo_0;
224ec323
JH		 2411 /* .. but if we have glibc, we might have a buggy _moddi3
2412 * (at least glicb 2.2.5 is known to have this bug), in other
2413 * words our integer modulus with negative quad as the second
2414 * argument might be broken. Test for this and re-patch the
2415 * opcode dispatch table if that is the case, remembering to
2416 * also apply the workaround so that this first round works
2417 * right, too. See [perl #9402] for more information. */
224ec323
JH		 2418 {
2419 IV l = 3;
2420 IV r = -10;
2421 /* Cannot do this check with inlined IV constants since
2422 * that seems to work correctly even with the buggy glibc. */
2423 if (l % r == -3) {
2424 /* Yikes, we have the bug.
2425 * Patch in the workaround version. */
2426 PL_op->op_ppaddr =
2427 PL_ppaddr[OP_I_MODULO] =
2428 &Perl_pp_i_modulo_1;
2429 /* Make certain we work right this time, too. */
32fdb065 2430 right = PERL_ABS(right);
224ec323
JH		 2431 }
2432 }
a0cec769
YST		 2433 /* avoid FPE_INTOVF on some platforms when left is IV_MIN */
2434 if (right == -1)
2435 SETi( 0 );
2436 else
2437 SETi( left % right );
224ec323
JH		 2438 RETURN;
2439 }
79072805 2440}
befad5d1 2441#endif
79072805 2442
a0d0e21e 2443PP(pp_i_add)
79072805 2444{
6f1401dc
DM		 2445 dVAR; dSP; dATARGET;
2446 tryAMAGICbin_MG(add_amg, AMGf_assign);
a0d0e21e 2447 {
6f1401dc 2448 dPOPTOPiirl_ul_nomg;
a0d0e21e
LW		 2449 SETi( left + right );
2450 RETURN;
79072805 2451 }
79072805
LW		 2452}
2453
a0d0e21e 2454PP(pp_i_subtract)
79072805 2455{
6f1401dc
DM		 2456 dVAR; dSP; dATARGET;
2457 tryAMAGICbin_MG(subtr_amg, AMGf_assign);
a0d0e21e 2458 {
6f1401dc 2459 dPOPTOPiirl_ul_nomg;
a0d0e21e
LW		 2460 SETi( left - right );
2461 RETURN;
79072805 2462 }
79072805
LW		 2463}
2464
a0d0e21e 2465PP(pp_i_lt)
79072805 2466{
6f1401dc
DM		 2467 dVAR; dSP;
2468 tryAMAGICbin_MG(lt_amg, AMGf_set);
a0d0e21e 2469 {
96b6b87f 2470 dPOPTOPiirl_nomg;
54310121 2471 SETs(boolSV(left < right));
a0d0e21e
LW		 2472 RETURN;
2473 }
79072805
LW		 2474}
2475
a0d0e21e 2476PP(pp_i_gt)
79072805 2477{
6f1401dc
DM		 2478 dVAR; dSP;
2479 tryAMAGICbin_MG(gt_amg, AMGf_set);
a0d0e21e 2480 {
96b6b87f 2481 dPOPTOPiirl_nomg;
54310121 2482 SETs(boolSV(left > right));
a0d0e21e
LW		 2483 RETURN;
2484 }
79072805
LW		 2485}
2486
a0d0e21e 2487PP(pp_i_le)
79072805 2488{
6f1401dc
DM		 2489 dVAR; dSP;
2490 tryAMAGICbin_MG(le_amg, AMGf_set);
a0d0e21e 2491 {
96b6b87f 2492 dPOPTOPiirl_nomg;
54310121 2493 SETs(boolSV(left <= right));
a0d0e21e 2494 RETURN;
85e6fe83 2495 }
79072805
LW		 2496}
2497
a0d0e21e 2498PP(pp_i_ge)
79072805 2499{
6f1401dc
DM		 2500 dVAR; dSP;
2501 tryAMAGICbin_MG(ge_amg, AMGf_set);
a0d0e21e 2502 {
96b6b87f 2503 dPOPTOPiirl_nomg;
54310121 2504 SETs(boolSV(left >= right));
a0d0e21e
LW		 2505 RETURN;
2506 }
79072805
LW		 2507}
2508
a0d0e21e 2509PP(pp_i_eq)
79072805 2510{
6f1401dc
DM		 2511 dVAR; dSP;
2512 tryAMAGICbin_MG(eq_amg, AMGf_set);
a0d0e21e 2513 {
96b6b87f 2514 dPOPTOPiirl_nomg;
54310121 2515 SETs(boolSV(left == right));
a0d0e21e
LW		 2516 RETURN;
2517 }
79072805
LW		 2518}
2519
a0d0e21e 2520PP(pp_i_ne)
79072805 2521{
6f1401dc
DM		 2522 dVAR; dSP;
2523 tryAMAGICbin_MG(ne_amg, AMGf_set);
a0d0e21e 2524 {
96b6b87f 2525 dPOPTOPiirl_nomg;
54310121 2526 SETs(boolSV(left != right));
a0d0e21e
LW		 2527 RETURN;
2528 }
79072805
LW		 2529}
2530
a0d0e21e 2531PP(pp_i_ncmp)
79072805 2532{
6f1401dc
DM		 2533 dVAR; dSP; dTARGET;
2534 tryAMAGICbin_MG(ncmp_amg, 0);
a0d0e21e 2535 {
96b6b87f 2536 dPOPTOPiirl_nomg;
a0d0e21e 2537 I32 value;
79072805 2538
a0d0e21e 2539 if (left > right)
79072805 2540 value = 1;
a0d0e21e 2541 else if (left < right)
79072805 2542 value = -1;
a0d0e21e 2543 else
79072805 2544 value = 0;
a0d0e21e
LW		 2545 SETi(value);
2546 RETURN;
79072805 2547 }
85e6fe83
LW		 2548}
2549
2550PP(pp_i_negate)
2551{
6f1401dc
DM		 2552 dVAR; dSP; dTARGET;
2553 tryAMAGICun_MG(neg_amg, 0);
2554 {
2555 SV * const sv = TOPs;
2556 IV const i = SvIV_nomg(sv);
2557 SETi(-i);
2558 RETURN;
2559 }
85e6fe83
LW		 2560}
2561
79072805
LW		 2562/* High falutin' math. */
2563
2564PP(pp_atan2)
2565{
6f1401dc
DM		 2566 dVAR; dSP; dTARGET;
2567 tryAMAGICbin_MG(atan2_amg, 0);
a0d0e21e 2568 {
096c060c 2569 dPOPTOPnnrl_nomg;
a1021d57 2570 SETn(Perl_atan2(left, right));
a0d0e21e
LW		 2571 RETURN;
2572 }
79072805
LW		 2573}
2574
2575PP(pp_sin)
2576{
71302fe3
NC		 2577 dVAR; dSP; dTARGET;
2578 int amg_type = sin_amg;
2579 const char *neg_report = NULL;
bc81784a 2580 NV (*func)(NV) = Perl_sin;
71302fe3
NC		 2581 const int op_type = PL_op->op_type;
2582
2583 switch (op_type) {
2584 case OP_COS:
2585 amg_type = cos_amg;
bc81784a 2586 func = Perl_cos;
71302fe3
NC		 2587 break;
2588 case OP_EXP:
2589 amg_type = exp_amg;
bc81784a 2590 func = Perl_exp;
71302fe3
NC		 2591 break;
2592 case OP_LOG:
2593 amg_type = log_amg;
bc81784a 2594 func = Perl_log;
71302fe3
NC		 2595 neg_report = "log";
2596 break;
2597 case OP_SQRT:
2598 amg_type = sqrt_amg;
bc81784a 2599 func = Perl_sqrt;
71302fe3
NC		 2600 neg_report = "sqrt";
2601 break;
a0d0e21e 2602 }
79072805 2603
6f1401dc
DM		 2604
2605 tryAMAGICun_MG(amg_type, 0);
a0d0e21e 2606 {
6f1401dc
DM		 2607 SV * const arg = POPs;
2608 const NV value = SvNV_nomg(arg);
71302fe3
NC		 2609 if (neg_report) {
2610 if (op_type == OP_LOG ? (value <= 0.0) : (value < 0.0)) {
2611 SET_NUMERIC_STANDARD();
dcbac5bb 2612 /* diag_listed_as: Can't take log of %g */
71302fe3
NC		 2613 DIE(aTHX_ "Can't take %s of %"NVgf, neg_report, value);
2614 }
2615 }
2616 XPUSHn(func(value));
a0d0e21e
LW		 2617 RETURN;
2618 }
79072805
LW		 2619}
2620
56cb0a1c
AD		 2621/* Support Configure command-line overrides for rand() functions.
2622 After 5.005, perhaps we should replace this by Configure support
2623 for drand48(), random(), or rand(). For 5.005, though, maintain
2624 compatibility by calling rand() but allow the user to override it.
2625 See INSTALL for details. --Andy Dougherty 15 July 1998
2626*/
85ab1d1d
JH		 2627/* Now it's after 5.005, and Configure supports drand48() and random(),
2628 in addition to rand(). So the overrides should not be needed any more.
2629 --Jarkko Hietaniemi 27 September 1998
2630 */
2631
2632#ifndef HAS_DRAND48_PROTO
20ce7b12 2633extern double drand48 (void);
56cb0a1c
AD		 2634#endif
2635
79072805
LW		 2636PP(pp_rand)
2637{
97aff369 2638 dVAR; dSP; dTARGET;
65202027 2639 NV value;
79072805
LW		 2640 if (MAXARG < 1)
2641 value = 1.0;
94ec06bc
FC		 2642 else if (!TOPs) {
2643 value = 1.0; (void)POPs;
2644 }
79072805
LW		 2645 else
2646 value = POPn;
2647 if (value == 0.0)
2648 value = 1.0;
80252599 2649 if (!PL_srand_called) {
85ab1d1d 2650 (void)seedDrand01((Rand_seed_t)seed());
80252599 2651 PL_srand_called = TRUE;
93dc8474 2652 }
85ab1d1d 2653 value *= Drand01();
79072805
LW		 2654 XPUSHn(value);
2655 RETURN;
2656}
2657
2658PP(pp_srand)
2659{
83832992 2660 dVAR; dSP; dTARGET;
d22667bf 2661 const UV anum = (MAXARG < 1 || (!TOPs && !POPs)) ? seed() : POPu;
85ab1d1d 2662 (void)seedDrand01((Rand_seed_t)anum);
80252599 2663 PL_srand_called = TRUE;
da1010ec
NC		 2664 if (anum)
2665 XPUSHu(anum);
2666 else {
2667 /* Historically srand always returned true. We can avoid breaking
2668 that like this: */
2669 sv_setpvs(TARG, "0 but true");
2670 XPUSHTARG;
2671 }
83832992 2672 RETURN;
79072805
LW		 2673}
2674
79072805
LW		 2675PP(pp_int)
2676{
6f1401dc
DM		 2677 dVAR; dSP; dTARGET;
2678 tryAMAGICun_MG(int_amg, AMGf_numeric);
774d564b 2679 {
6f1401dc
DM		 2680 SV * const sv = TOPs;
2681 const IV iv = SvIV_nomg(sv);
28e5dec8
JH		 2682 /* XXX it's arguable that compiler casting to IV might be subtly
2683 different from modf (for numbers inside (IV_MIN,UV_MAX)) in which
2684 else preferring IV has introduced a subtle behaviour change bug. OTOH
2685 relying on floating point to be accurate is a bug. */
2686
c781a409 2687 if (!SvOK(sv)) {
922c4365 2688 SETu(0);
c781a409
RD		 2689 }
2690 else if (SvIOK(sv)) {
2691 if (SvIsUV(sv))
6f1401dc 2692 SETu(SvUV_nomg(sv));
c781a409 2693 else
28e5dec8 2694 SETi(iv);
c781a409 2695 }
c781a409 2696 else {
6f1401dc 2697 const NV value = SvNV_nomg(sv);
1048ea30 2698 if (value >= 0.0) {
28e5dec8
JH		 2699 if (value < (NV)UV_MAX + 0.5) {
2700 SETu(U_V(value));
2701 } else {
059a1014 2702 SETn(Perl_floor(value));
28e5dec8 2703 }
1048ea30 2704 }
28e5dec8
JH		 2705 else {
2706 if (value > (NV)IV_MIN - 0.5) {
2707 SETi(I_V(value));
2708 } else {
1bbae031 2709 SETn(Perl_ceil(value));
28e5dec8
JH		 2710 }
2711 }
774d564b 2712 }
79072805 2713 }
79072805
LW		 2714 RETURN;
2715}
2716
463ee0b2
LW		 2717PP(pp_abs)
2718{
6f1401dc
DM		 2719 dVAR; dSP; dTARGET;
2720 tryAMAGICun_MG(abs_amg, AMGf_numeric);
a0d0e21e 2721 {
6f1401dc 2722 SV * const sv = TOPs;
28e5dec8 2723 /* This will cache the NV value if string isn't actually integer */
6f1401dc 2724 const IV iv = SvIV_nomg(sv);
a227d84d 2725
800401ee 2726 if (!SvOK(sv)) {
922c4365 2727 SETu(0);
800401ee
JH		 2728 }
2729 else if (SvIOK(sv)) {
28e5dec8 2730 /* IVX is precise */
800401ee 2731 if (SvIsUV(sv)) {
6f1401dc 2732 SETu(SvUV_nomg(sv)); /* force it to be numeric only */
28e5dec8
JH		 2733 } else {
2734 if (iv >= 0) {
2735 SETi(iv);
2736 } else {
2737 if (iv != IV_MIN) {
2738 SETi(-iv);
2739 } else {
2740 /* 2s complement assumption. Also, not really needed as
2741 IV_MIN and -IV_MIN should both be %100...00 and NV-able */
2742 SETu(IV_MIN);
2743 }
a227d84d 2744 }
28e5dec8
JH		 2745 }
2746 } else{
6f1401dc 2747 const NV value = SvNV_nomg(sv);
774d564b 2748 if (value < 0.0)
1b6737cc 2749 SETn(-value);
a4474c9e
DD		 2750 else
2751 SETn(value);
774d564b 2752 }
a0d0e21e 2753 }
774d564b 2754 RETURN;
463ee0b2
LW		 2755}
2756
79072805
LW		 2757PP(pp_oct)
2758{
97aff369 2759 dVAR; dSP; dTARGET;
5c144d81 2760 const char *tmps;
53305cf1 2761 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES;
6f894ead 2762 STRLEN len;
53305cf1
NC		 2763 NV result_nv;
2764 UV result_uv;
1b6737cc 2765 SV* const sv = POPs;
79072805 2766
349d4f2f 2767 tmps = (SvPV_const(sv, len));
2bc69dc4
NIS		 2768 if (DO_UTF8(sv)) {
2769 /* If Unicode, try to downgrade
2770 * If not possible, croak. */
1b6737cc 2771 SV* const tsv = sv_2mortal(newSVsv(sv));
2bc69dc4
NIS		 2772
2773 SvUTF8_on(tsv);
2774 sv_utf8_downgrade(tsv, FALSE);
349d4f2f 2775 tmps = SvPV_const(tsv, len);
2bc69dc4 2776 }
daa2adfd
NC		 2777 if (PL_op->op_type == OP_HEX)
2778 goto hex;
2779
6f894ead 2780 while (*tmps && len && isSPACE(*tmps))
53305cf1 2781 tmps++, len--;
9e24b6e2 2782 if (*tmps == '0')
53305cf1 2783 tmps++, len--;
a674e8db 2784 if (*tmps == 'x' || *tmps == 'X') {
daa2adfd 2785 hex:
53305cf1 2786 result_uv = grok_hex (tmps, &len, &flags, &result_nv);
daa2adfd 2787 }
a674e8db 2788 else if (*tmps == 'b' || *tmps == 'B')
53305cf1 2789 result_uv = grok_bin (tmps, &len, &flags, &result_nv);
464e2e8a 2790 else
53305cf1
NC		 2791 result_uv = grok_oct (tmps, &len, &flags, &result_nv);
2792
2793 if (flags & PERL_SCAN_GREATER_THAN_UV_MAX) {
2794 XPUSHn(result_nv);
2795 }
2796 else {
2797 XPUSHu(result_uv);
2798 }
79072805
LW		 2799 RETURN;
2800}
2801
2802/* String stuff. */
2803
2804PP(pp_length)
2805{
97aff369 2806 dVAR; dSP; dTARGET;
0bd48802 2807 SV * const sv = TOPs;
a0ed51b3 2808
656266fc 2809 if (SvGAMAGIC(sv)) {
9f621bb0
NC		 2810 /* For an overloaded or magic scalar, we can't know in advance if
2811 it's going to be UTF-8 or not. Also, we can't call sv_len_utf8 as
2812 it likes to cache the length. Maybe that should be a documented
2813 feature of it.
92331800
NC		 2814 */
2815 STRLEN len;
9f621bb0
NC		 2816 const char *const p
2817 = sv_2pv_flags(sv, &len,
2818 SV_UNDEF_RETURNS_NULL|SV_CONST_RETURN|SV_GMAGIC);
92331800 2819
d88e091f 2820 if (!p) {
9407f9c1
DL		 2821 if (!SvPADTMP(TARG)) {
2822 sv_setsv(TARG, &PL_sv_undef);
2823 SETTARG;
2824 }
2825 SETs(&PL_sv_undef);
d88e091f 2826 }
9f621bb0 2827 else if (DO_UTF8(sv)) {
899be101 2828 SETi(utf8_length((U8*)p, (U8*)p + len));
92331800
NC		 2829 }
2830 else
2831 SETi(len);
656266fc 2832 } else if (SvOK(sv)) {
9f621bb0
NC		 2833 /* Neither magic nor overloaded. */
2834 if (DO_UTF8(sv))
2835 SETi(sv_len_utf8(sv));
2836 else
2837 SETi(sv_len(sv));
656266fc 2838 } else {
9407f9c1
DL		 2839 if (!SvPADTMP(TARG)) {
2840 sv_setsv_nomg(TARG, &PL_sv_undef);
2841 SETTARG;
2842 }
2843 SETs(&PL_sv_undef);
92331800 2844 }
79072805
LW		 2845 RETURN;
2846}
2847
83f78d1a
FC		 2848/* Returns false if substring is completely outside original string.
2849 No length is indicated by len_iv = 0 and len_is_uv = 0. len_is_uv must
2850 always be true for an explicit 0.
2851*/
2852bool
2853Perl_translate_substr_offsets(pTHX_ STRLEN curlen, IV pos1_iv,
2854 bool pos1_is_uv, IV len_iv,
2855 bool len_is_uv, STRLEN *posp,
2856 STRLEN *lenp)
2857{
2858 IV pos2_iv;
2859 int pos2_is_uv;
2860
2861 PERL_ARGS_ASSERT_TRANSLATE_SUBSTR_OFFSETS;
2862
2863 if (!pos1_is_uv && pos1_iv < 0 && curlen) {
2864 pos1_is_uv = curlen-1 > ~(UV)pos1_iv;
2865 pos1_iv += curlen;
2866 }
2867 if ((pos1_is_uv || pos1_iv > 0) && (UV)pos1_iv > curlen)
2868 return FALSE;
2869
2870 if (len_iv || len_is_uv) {
2871 if (!len_is_uv && len_iv < 0) {
2872 pos2_iv = curlen + len_iv;
2873 if (curlen)
2874 pos2_is_uv = curlen-1 > ~(UV)len_iv;
2875 else
2876 pos2_is_uv = 0;
2877 } else { /* len_iv >= 0 */
2878 if (!pos1_is_uv && pos1_iv < 0) {
2879 pos2_iv = pos1_iv + len_iv;
2880 pos2_is_uv = (UV)len_iv > (UV)IV_MAX;
2881 } else {
2882 if ((UV)len_iv > curlen-(UV)pos1_iv)
2883 pos2_iv = curlen;
2884 else
2885 pos2_iv = pos1_iv+len_iv;
2886 pos2_is_uv = 1;
2887 }
2888 }
2889 }
2890 else {
2891 pos2_iv = curlen;
2892 pos2_is_uv = 1;
2893 }
2894
2895 if (!pos2_is_uv && pos2_iv < 0) {
2896 if (!pos1_is_uv && pos1_iv < 0)
2897 return FALSE;
2898 pos2_iv = 0;
2899 }
2900 else if (!pos1_is_uv && pos1_iv < 0)
2901 pos1_iv = 0;
2902
2903 if ((UV)pos2_iv < (UV)pos1_iv)
2904 pos2_iv = pos1_iv;
2905 if ((UV)pos2_iv > curlen)
2906 pos2_iv = curlen;
2907
2908 /* pos1_iv and pos2_iv both in 0..curlen, so the cast is safe */
2909 *posp = (STRLEN)( (UV)pos1_iv );
2910 *lenp = (STRLEN)( (UV)pos2_iv - (UV)pos1_iv );
2911
2912 return TRUE;
2913}
2914
79072805
LW		 2915PP(pp_substr)
2916{
97aff369 2917 dVAR; dSP; dTARGET;
79072805 2918 SV *sv;
463ee0b2 2919 STRLEN curlen;
9402d6ed 2920 STRLEN utf8_curlen;
777f7c56
EB		 2921 SV * pos_sv;
2922 IV pos1_iv;
2923 int pos1_is_uv;
777f7c56
EB		 2924 SV * len_sv;
2925 IV len_iv = 0;
83f78d1a 2926 int len_is_uv = 0;
24fcb59f 2927 I32 lvalue = PL_op->op_flags & OPf_MOD || LVRET;
bbddc9e0 2928 const bool rvalue = (GIMME_V != G_VOID);
e1ec3a88 2929 const char *tmps;
9402d6ed 2930 SV *repl_sv = NULL;
cbbf8932 2931 const char *repl = NULL;
7b8d334a 2932 STRLEN repl_len;
7bc95ae1 2933 int num_args = PL_op->op_private & 7;
13e30c65 2934 bool repl_need_utf8_upgrade = FALSE;
9402d6ed 2935 bool repl_is_utf8 = FALSE;
79072805 2936
78f9721b
SM		 2937 if (num_args > 2) {
2938 if (num_args > 3) {
24fcb59f 2939 if(!(repl_sv = POPs)) num_args--;
7bc95ae1
FC		 2940 }
2941 if ((len_sv = POPs)) {
2942 len_iv = SvIV(len_sv);
83f78d1a 2943 len_is_uv = len_iv ? SvIOK_UV(len_sv) : 1;
7b8d334a 2944 }
7bc95ae1 2945 else num_args--;
5d82c453 2946 }
777f7c56
EB		 2947 pos_sv = POPs;
2948 pos1_iv = SvIV(pos_sv);
2949 pos1_is_uv = SvIOK_UV(pos_sv);
79072805 2950 sv = POPs;
24fcb59f
FC		 2951 if (PL_op->op_private & OPpSUBSTR_REPL_FIRST) {
2952 assert(!repl_sv);
2953 repl_sv = POPs;
2954 }
849ca7ee 2955 PUTBACK;
9402d6ed 2956 if (repl_sv) {
24fcb59f
FC		 2957 repl = SvPV_const(repl_sv, repl_len);
2958 repl_is_utf8 = DO_UTF8(repl_sv) && repl_len;
9402d6ed
JH		 2959 if (repl_is_utf8) {
2960 if (!DO_UTF8(sv))
2961 sv_utf8_upgrade(sv);
2962 }
13e30c65
JH		 2963 else if (DO_UTF8(sv))
2964 repl_need_utf8_upgrade = TRUE;
9402d6ed 2965 }
83f78d1a
FC		 2966 else if (lvalue) {
2967 SV * ret;
2968 ret = sv_2mortal(newSV_type(SVt_PVLV)); /* Not TARG RT#67838 */
2969 sv_magic(ret, NULL, PERL_MAGIC_substr, NULL, 0);
2970 LvTYPE(ret) = 'x';
2971 LvTARG(ret) = SvREFCNT_inc_simple(sv);
2972 LvTARGOFF(ret) =
2973 pos1_is_uv || pos1_iv >= 0
2974 ? (STRLEN)(UV)pos1_iv
2975 : (LvFLAGS(ret) |= 1, (STRLEN)(UV)-pos1_iv);
2976 LvTARGLEN(ret) =
2977 len_is_uv || len_iv > 0
2978 ? (STRLEN)(UV)len_iv
2979 : (LvFLAGS(ret) |= 2, (STRLEN)(UV)-len_iv);
2980
2981 SPAGAIN;
2982 PUSHs(ret); /* avoid SvSETMAGIC here */
2983 RETURN;
a74fb2cd 2984 }
83f78d1a 2985 tmps = SvPV_const(sv, curlen);
7e2040f0 2986 if (DO_UTF8(sv)) {
9402d6ed
JH		 2987 utf8_curlen = sv_len_utf8(sv);
2988 if (utf8_curlen == curlen)
2989 utf8_curlen = 0;
a0ed51b3 2990 else
9402d6ed 2991 curlen = utf8_curlen;
a0ed51b3 2992 }
d1c2b58a 2993 else
9402d6ed 2994 utf8_curlen = 0;
a0ed51b3 2995
83f78d1a
FC		 2996 {
2997 STRLEN pos, len, byte_len, byte_pos;
777f7c56 2998
83f78d1a
FC		 2999 if (!translate_substr_offsets(
3000 curlen, pos1_iv, pos1_is_uv, len_iv, len_is_uv, &pos, &len
3001 )) goto bound_fail;
777f7c56 3002
83f78d1a
FC		 3003 byte_len = len;
3004 byte_pos = utf8_curlen
d931b1be
NC		 3005 ? sv_pos_u2b_flags(sv, pos, &byte_len, SV_CONST_RETURN) : pos;
3006
2154eca7 3007 tmps += byte_pos;
bbddc9e0
CS		 3008
3009 if (rvalue) {
3010 SvTAINTED_off(TARG); /* decontaminate */
3011 SvUTF8_off(TARG); /* decontaminate */
3012 sv_setpvn(TARG, tmps, byte_len);
12aa1545 3013#ifdef USE_LOCALE_COLLATE
bbddc9e0 3014 sv_unmagic(TARG, PERL_MAGIC_collxfrm);
12aa1545 3015#endif
bbddc9e0
CS		 3016 if (utf8_curlen)
3017 SvUTF8_on(TARG);
3018 }
2154eca7 3019
f7928d6c 3020 if (repl) {
13e30c65
JH		 3021 SV* repl_sv_copy = NULL;
3022
3023 if (repl_need_utf8_upgrade) {
3024 repl_sv_copy = newSVsv(repl_sv);
3025 sv_utf8_upgrade(repl_sv_copy);
349d4f2f 3026 repl = SvPV_const(repl_sv_copy, repl_len);
bf32a30c 3027 repl_is_utf8 = DO_UTF8(repl_sv_copy) && repl_len;
13e30c65 3028 }
24fcb59f
FC		 3029 if (SvROK(sv))
3030 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
3031 "Attempt to use reference as lvalue in substr"
3032 );
502d9230
VP		 3033 if (!SvOK(sv))
3034 sv_setpvs(sv, "");
777f7c56 3035 sv_insert_flags(sv, byte_pos, byte_len, repl, repl_len, 0);
9402d6ed 3036 if (repl_is_utf8)
f7928d6c 3037 SvUTF8_on(sv);
ef8d46e8 3038 SvREFCNT_dec(repl_sv_copy);
f7928d6c 3039 }
79072805 3040 }
849ca7ee 3041 SPAGAIN;
bbddc9e0
CS		 3042 if (rvalue) {
3043 SvSETMAGIC(TARG);
3044 PUSHs(TARG);
3045 }
79072805 3046 RETURN;
777f7c56 3047
1c900557 3048bound_fail:
83f78d1a 3049 if (repl)
777f7c56
EB		 3050 Perl_croak(aTHX_ "substr outside of string");
3051 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
3052 RETPUSHUNDEF;
79072805
LW		 3053}
3054
3055PP(pp_vec)
3056{
2154eca7 3057 dVAR; dSP;
1b6737cc
AL		 3058 register const IV size = POPi;
3059 register const IV offset = POPi;
3060 register SV * const src = POPs;
3061 const I32 lvalue = PL_op->op_flags & OPf_MOD || LVRET;
2154eca7 3062 SV * ret;
a0d0e21e 3063
81e118e0 3064 if (lvalue) { /* it's an lvalue! */
2154eca7
EB		 3065 ret = sv_2mortal(newSV_type(SVt_PVLV)); /* Not TARG RT#67838 */
3066 sv_magic(ret, NULL, PERL_MAGIC_vec, NULL, 0);
3067 LvTYPE(ret) = 'v';
3068 LvTARG(ret) = SvREFCNT_inc_simple(src);
3069 LvTARGOFF(ret) = offset;
3070 LvTARGLEN(ret) = size;
3071 }
3072 else {
3073 dTARGET;
3074 SvTAINTED_off(TARG); /* decontaminate */
3075 ret = TARG;
79072805
LW		 3076 }
3077
2154eca7
EB		 3078 sv_setuv(ret, do_vecget(src, offset, size));
3079 PUSHs(ret);
79072805
LW		 3080 RETURN;
3081}
3082
3083PP(pp_index)
3084{
97aff369 3085 dVAR; dSP; dTARGET;
79072805
LW		 3086 SV *big;
3087 SV *little;
c445ea15 3088 SV *temp = NULL;
ad66a58c 3089 STRLEN biglen;
2723d216 3090 STRLEN llen = 0;
79072805
LW		 3091 I32 offset;
3092 I32 retval;
73ee8be2
NC		 3093 const char *big_p;
3094 const char *little_p;
2f040f7f
NC		 3095 bool big_utf8;
3096 bool little_utf8;
2723d216 3097 const bool is_index = PL_op->op_type == OP_INDEX;
d3e26383 3098 const bool threeargs = MAXARG >= 3 && (TOPs || ((void)POPs,0));
79072805 3099
e1dccc0d
Z		 3100 if (threeargs)
3101 offset = POPi;
79072805
LW		 3102 little = POPs;
3103 big = POPs;
73ee8be2
NC		 3104 big_p = SvPV_const(big, biglen);
3105 little_p = SvPV_const(little, llen);
3106
e609e586
NC		 3107 big_utf8 = DO_UTF8(big);
3108 little_utf8 = DO_UTF8(little);
3109 if (big_utf8 ^ little_utf8) {
3110 /* One needs to be upgraded. */
2f040f7f
NC		 3111 if (little_utf8 && !PL_encoding) {
3112 /* Well, maybe instead we might be able to downgrade the small
3113 string? */
1eced8f8 3114 char * const pv = (char*)bytes_from_utf8((U8 *)little_p, &llen,
2f040f7f
NC		 3115 &little_utf8);
3116 if (little_utf8) {
3117 /* If the large string is ISO-8859-1, and it's not possible to
3118 convert the small string to ISO-8859-1, then there is no
3119 way that it could be found anywhere by index. */
3120 retval = -1;
3121 goto fail;
3122 }
e609e586 3123
2f040f7f
NC		 3124 /* At this point, pv is a malloc()ed string. So donate it to temp
3125 to ensure it will get free()d */
3126 little = temp = newSV(0);
73ee8be2
NC		 3127 sv_usepvn(temp, pv, llen);
3128 little_p = SvPVX(little);
e609e586 3129 } else {
73ee8be2
NC		 3130 temp = little_utf8
3131 ? newSVpvn(big_p, biglen) : newSVpvn(little_p, llen);
2f040f7f
NC		 3132
3133 if (PL_encoding) {
3134 sv_recode_to_utf8(temp, PL_encoding);
3135 } else {
3136 sv_utf8_upgrade(temp);
3137 }
3138 if (little_utf8) {
3139 big = temp;
3140 big_utf8 = TRUE;
73ee8be2 3141 big_p = SvPV_const(big, biglen);
2f040f7f
NC		 3142 } else {
3143 little = temp;
73ee8be2 3144 little_p = SvPV_const(little, llen);
2f040f7f 3145 }
e609e586
NC		 3146 }
3147 }
73ee8be2
NC		 3148 if (SvGAMAGIC(big)) {
3149 /* Life just becomes a lot easier if I use a temporary here.
3150 Otherwise I need to avoid calls to sv_pos_u2b(), which (dangerously)
3151 will trigger magic and overloading again, as will fbm_instr()
3152 */
59cd0e26
NC		 3153 big = newSVpvn_flags(big_p, biglen,
3154 SVs_TEMP | (big_utf8 ? SVf_UTF8 : 0));
73ee8be2
NC		 3155 big_p = SvPVX(big);
3156 }
e4e44778 3157 if (SvGAMAGIC(little) || (is_index && !SvOK(little))) {
73ee8be2
NC		 3158 /* index && SvOK() is a hack. fbm_instr() calls SvPV_const, which will
3159 warn on undef, and we've already triggered a warning with the
3160 SvPV_const some lines above. We can't remove that, as we need to
3161 call some SvPV to trigger overloading early and find out if the
3162 string is UTF-8.
3163 This is all getting to messy. The API isn't quite clean enough,
3164 because data access has side effects.
3165 */
59cd0e26
NC		 3166 little = newSVpvn_flags(little_p, llen,
3167 SVs_TEMP | (little_utf8 ? SVf_UTF8 : 0));
73ee8be2
NC		 3168 little_p = SvPVX(little);
3169 }
e609e586 3170
d3e26383 3171 if (!threeargs)
2723d216 3172 offset = is_index ? 0 : biglen;
a0ed51b3 3173 else {
ad66a58c 3174 if (big_utf8 && offset > 0)
a0ed51b3 3175 sv_pos_u2b(big, &offset, 0);
73ee8be2
NC		 3176 if (!is_index)
3177 offset += llen;
a0ed51b3 3178 }
79072805
LW		 3179 if (offset < 0)
3180 offset = 0;
ad66a58c
NC		 3181 else if (offset > (I32)biglen)
3182 offset = biglen;
73ee8be2
NC		 3183 if (!(little_p = is_index
3184 ? fbm_instr((unsigned char*)big_p + offset,
3185 (unsigned char*)big_p + biglen, little, 0)
3186 : rninstr(big_p, big_p + offset,
3187 little_p, little_p + llen)))
a0ed51b3 3188 retval = -1;
ad66a58c 3189 else {
73ee8be2 3190 retval = little_p - big_p;
ad66a58c
NC		 3191 if (retval > 0 && big_utf8)
3192 sv_pos_b2u(big, &retval);
3193 }
ef8d46e8 3194 SvREFCNT_dec(temp);
2723d216 3195 fail:
e1dccc0d 3196 PUSHi(retval);
79072805
LW		 3197 RETURN;
3198}
3199
3200PP(pp_sprintf)
3201{
97aff369 3202 dVAR; dSP; dMARK; dORIGMARK; dTARGET;
3e6bd4bf 3203 SvTAINTED_off(TARG);
79072805 3204 do_sprintf(TARG, SP-MARK, MARK+1);
bbce6d69 3205 TAINT_IF(SvTAINTED(TARG));
79072805
LW		 3206 SP = ORIGMARK;
3207 PUSHTARG;
3208 RETURN;
3209}
3210
79072805
LW		 3211PP(pp_ord)
3212{
97aff369 3213 dVAR; dSP; dTARGET;
1eced8f8 3214
7df053ec 3215 SV *argsv = POPs;
ba210ebe 3216 STRLEN len;
349d4f2f 3217 const U8 *s = (U8*)SvPV_const(argsv, len);
121910a4 3218
799ef3cb 3219 if (PL_encoding && SvPOK(argsv) && !DO_UTF8(argsv)) {
1eced8f8 3220 SV * const tmpsv = sv_2mortal(newSVsv(argsv));
799ef3cb 3221 s = (U8*)sv_recode_to_utf8(tmpsv, PL_encoding);
121910a4
JH		 3222 argsv = tmpsv;
3223 }
79072805 3224
872c91ae 3225 XPUSHu(DO_UTF8(argsv) ?
89ebb4a3 3226 utf8n_to_uvchr(s, UTF8_MAXBYTES, 0, UTF8_ALLOW_ANYUV) :
5fc32dea 3227 (UV)(*s & 0xff));
68795e93 3228
79072805
LW		 3229 RETURN;
3230}
3231
463ee0b2
LW		 3232PP(pp_chr)
3233{
97aff369 3234 dVAR; dSP; dTARGET;
463ee0b2 3235 char *tmps;
8a064bd6
JH		 3236 UV value;
3237
3238 if (((SvIOK_notUV(TOPs) && SvIV(TOPs) < 0)
3239 ||
3240 (SvNOK(TOPs) && SvNV(TOPs) < 0.0))) {
3241 if (IN_BYTES) {
3242 value = POPu; /* chr(-1) eq chr(0xff), etc. */
3243 } else {
3244 (void) POPs; /* Ignore the argument value. */
3245 value = UNICODE_REPLACEMENT;
3246 }
3247 } else {
3248 value = POPu;
3249 }
463ee0b2 3250
862a34c6 3251 SvUPGRADE(TARG,SVt_PV);
a0ed51b3 3252
0064a8a9 3253 if (value > 255 && !IN_BYTES) {
eb160463 3254 SvGROW(TARG, (STRLEN)UNISKIP(value)+1);
62961d2e 3255 tmps = (char*)uvchr_to_utf8_flags((U8*)SvPVX(TARG), value, 0);
349d4f2f 3256 SvCUR_set(TARG, tmps - SvPVX_const(TARG));
a0ed51b3
LW		 3257 *tmps = '\0';
3258 (void)SvPOK_only(TARG);
aa6ffa16 3259 SvUTF8_on(TARG);
a0ed51b3
LW		 3260 XPUSHs(TARG);
3261 RETURN;
3262 }
3263
748a9306 3264 SvGROW(TARG,2);
463ee0b2
LW		 3265 SvCUR_set(TARG, 1);
3266 tmps = SvPVX(TARG);
eb160463 3267 *tmps++ = (char)value;
748a9306 3268 *tmps = '\0';
a0d0e21e 3269 (void)SvPOK_only(TARG);
4c5ed6e2 3270
88632417 3271 if (PL_encoding && !IN_BYTES) {
799ef3cb 3272 sv_recode_to_utf8(TARG, PL_encoding);
88632417 3273 tmps = SvPVX(TARG);
28936164
KW		 3274 if (SvCUR(TARG) == 0
3275 || ! is_utf8_string((U8*)tmps, SvCUR(TARG))
3276 || UTF8_IS_REPLACEMENT((U8*) tmps, (U8*) tmps + SvCUR(TARG)))
3277 {
4c5ed6e2 3278 SvGROW(TARG, 2);
d5a15ac2 3279 tmps = SvPVX(TARG);
4c5ed6e2
TS		 3280 SvCUR_set(TARG, 1);
3281 *tmps++ = (char)value;
88632417 3282 *tmps = '\0';
4c5ed6e2 3283 SvUTF8_off(TARG);
88632417
JH		 3284 }
3285 }
4c5ed6e2 3286
463ee0b2
LW		 3287 XPUSHs(TARG);
3288 RETURN;
3289}
3290
79072805
LW		 3291PP(pp_crypt)
3292{
79072805 3293#ifdef HAS_CRYPT
97aff369 3294 dVAR; dSP; dTARGET;
5f74f29c 3295 dPOPTOPssrl;
85c16d83 3296 STRLEN len;
10516c54 3297 const char *tmps = SvPV_const(left, len);
2bc69dc4 3298
85c16d83 3299 if (DO_UTF8(left)) {
2bc69dc4 3300 /* If Unicode, try to downgrade.
f2791508
JH		 3301 * If not possible, croak.
3302 * Yes, we made this up. */
1b6737cc 3303 SV* const tsv = sv_2mortal(newSVsv(left));
2bc69dc4 3304
f2791508 3305 SvUTF8_on(tsv);
2bc69dc4 3306 sv_utf8_downgrade(tsv, FALSE);
349d4f2f 3307 tmps = SvPV_const(tsv, len);
85c16d83 3308 }
05404ffe
JH		 3309# ifdef USE_ITHREADS
3310# ifdef HAS_CRYPT_R
3311 if (!PL_reentrant_buffer->_crypt_struct_buffer) {
3312 /* This should be threadsafe because in ithreads there is only
3313 * one thread per interpreter. If this would not be true,
3314 * we would need a mutex to protect this malloc. */
3315 PL_reentrant_buffer->_crypt_struct_buffer =
3316 (struct crypt_data *)safemalloc(sizeof(struct crypt_data));
3317#if defined(__GLIBC__) || defined(__EMX__)
3318 if (PL_reentrant_buffer->_crypt_struct_buffer) {
3319 PL_reentrant_buffer->_crypt_struct_buffer->initialized = 0;
3320 /* work around glibc-2.2.5 bug */
3321 PL_reentrant_buffer->_crypt_struct_buffer->current_saltbits = 0;
3322 }
05404ffe 3323#endif
6ab58e4d 3324 }
05404ffe
JH		 3325# endif /* HAS_CRYPT_R */
3326# endif /* USE_ITHREADS */
5f74f29c 3327# ifdef FCRYPT
83003860 3328 sv_setpv(TARG, fcrypt(tmps, SvPV_nolen_const(right)));
5f74f29c 3329# else
83003860 3330 sv_setpv(TARG, PerlProc_crypt(tmps, SvPV_nolen_const(right)));
5f74f29c 3331# endif
ec93b65f 3332 SETTARG;
4808266b 3333 RETURN;
79072805 3334#else
b13b2135 3335 DIE(aTHX_
79072805
LW		 3336 "The crypt() function is unimplemented due to excessive paranoia.");
3337#endif
79072805
LW		 3338}
3339
00f254e2
KW		 3340/* Generally UTF-8 and UTF-EBCDIC are indistinguishable at this level. So
3341 * most comments below say UTF-8, when in fact they mean UTF-EBCDIC as well */
3342
00f254e2 3343/* Generates code to store a unicode codepoint c that is known to occupy
12b093a1
KW		 3344 * exactly two UTF-8 and UTF-EBCDIC bytes; it is stored into p and p+1,
3345 * and p is advanced to point to the next available byte after the two bytes */
00f254e2
KW		 3346#define CAT_UNI_TO_UTF8_TWO_BYTE(p, c) \
3347 STMT_START { \
3348 *(p)++ = UTF8_TWO_BYTE_HI(c); \
3349 *((p)++) = UTF8_TWO_BYTE_LO(c); \
3350 } STMT_END
3351
79072805
LW		 3352PP(pp_ucfirst)
3353{
00f254e2
KW		 3354 /* Actually is both lcfirst() and ucfirst(). Only the first character
3355 * changes. This means that possibly we can change in-place, ie., just
3356 * take the source and change that one character and store it back, but not
3357 * if read-only etc, or if the length changes */
3358
97aff369 3359 dVAR;
39644a26 3360 dSP;
d54190f6 3361 SV *source = TOPs;
00f254e2 3362 STRLEN slen; /* slen is the byte length of the whole SV. */
d54190f6
NC		 3363 STRLEN need;
3364 SV *dest;
00f254e2
KW		 3365 bool inplace; /* ? Convert first char only, in-place */
3366 bool doing_utf8 = FALSE; /* ? using utf8 */
3367 bool convert_source_to_utf8 = FALSE; /* ? need to convert */
12e9c124 3368 const int op_type = PL_op->op_type;
d54190f6
NC		 3369 const U8 *s;
3370 U8 *d;
3371 U8 tmpbuf[UTF8_MAXBYTES_CASE+1];
00f254e2
KW		 3372 STRLEN ulen; /* ulen is the byte length of the original Unicode character
3373 * stored as UTF-8 at s. */
3374 STRLEN tculen; /* tculen is the byte length of the freshly titlecased (or
3375 * lowercased) character stored in tmpbuf. May be either
3376 * UTF-8 or not, but in either case is the number of bytes */
094a2f8c 3377 bool tainted = FALSE;
d54190f6
NC		 3378
3379 SvGETMAGIC(source);
3380 if (SvOK(source)) {
3381 s = (const U8*)SvPV_nomg_const(source, slen);
3382 } else {
0a0ffbce
RGS		 3383 if (ckWARN(WARN_UNINITIALIZED))
3384 report_uninit(source);
1eced8f8 3385 s = (const U8*)"";
d54190f6
NC		 3386 slen = 0;
3387 }
a0ed51b3 3388
00f254e2
KW		 3389 /* We may be able to get away with changing only the first character, in
3390 * place, but not if read-only, etc. Later we may discover more reasons to
3391 * not convert in-place. */
3392 inplace = SvPADTMP(source) && !SvREADONLY(source) && SvTEMP(source);
3393
3394 /* First calculate what the changed first character should be. This affects
3395 * whether we can just swap it out, leaving the rest of the string unchanged,
3396 * or even if have to convert the dest to UTF-8 when the source isn't */
3397
3398 if (! slen) { /* If empty */
3399 need = 1; /* still need a trailing NUL */
b7576bcb 3400 ulen = 0;
00f254e2
KW		 3401 }
3402 else if (DO_UTF8(source)) { /* Is the source utf8? */
d54190f6 3403 doing_utf8 = TRUE;
17e95c9d 3404 ulen = UTF8SKIP(s);
094a2f8c
KW		 3405 if (op_type == OP_UCFIRST) {
3406 _to_utf8_title_flags(s, tmpbuf, &tculen,
3407 cBOOL(IN_LOCALE_RUNTIME), &tainted);
3408 }
3409 else {
3410 _to_utf8_lower_flags(s, tmpbuf, &tculen,
3411 cBOOL(IN_LOCALE_RUNTIME), &tainted);
3412 }
00f254e2 3413
17e95c9d
KW		 3414 /* we can't do in-place if the length changes. */
3415 if (ulen != tculen) inplace = FALSE;
3416 need = slen + 1 - ulen + tculen;
d54190f6 3417 }
00f254e2
KW		 3418 else { /* Non-zero length, non-UTF-8, Need to consider locale and if
3419 * latin1 is treated as caseless. Note that a locale takes
3420 * precedence */
167d19f2 3421 ulen = 1; /* Original character is 1 byte */
00f254e2
KW		 3422 tculen = 1; /* Most characters will require one byte, but this will
3423 * need to be overridden for the tricky ones */
3424 need = slen + 1;
3425
3426 if (op_type == OP_LCFIRST) {
d54190f6 3427
00f254e2
KW		 3428 /* lower case the first letter: no trickiness for any character */
3429 *tmpbuf = (IN_LOCALE_RUNTIME) ? toLOWER_LC(*s) :
3430 ((IN_UNI_8_BIT) ? toLOWER_LATIN1(*s) : toLOWER(*s));
3431 }
3432 /* is ucfirst() */
3433 else if (IN_LOCALE_RUNTIME) {
3434 *tmpbuf = toUPPER_LC(*s); /* This would be a bug if any locales
3435 * have upper and title case different
3436 */
3437 }
3438 else if (! IN_UNI_8_BIT) {
3439 *tmpbuf = toUPPER(*s); /* Returns caseless for non-ascii, or
3440 * on EBCDIC machines whatever the
3441 * native function does */
3442 }
3443 else { /* is ucfirst non-UTF-8, not in locale, and cased latin1 */
167d19f2
KW		 3444 UV title_ord = _to_upper_title_latin1(*s, tmpbuf, &tculen, 's');
3445 if (tculen > 1) {
3446 assert(tculen == 2);
3447
3448 /* If the result is an upper Latin1-range character, it can
3449 * still be represented in one byte, which is its ordinal */
3450 if (UTF8_IS_DOWNGRADEABLE_START(*tmpbuf)) {
3451 *tmpbuf = (U8) title_ord;
3452 tculen = 1;
00f254e2
KW		 3453 }
3454 else {
167d19f2
KW		 3455 /* Otherwise it became more than one ASCII character (in
3456 * the case of LATIN_SMALL_LETTER_SHARP_S) or changed to
3457 * beyond Latin1, so the number of bytes changed, so can't
3458 * replace just the first character in place. */
3459 inplace = FALSE;
3460
3461 /* If the result won't fit in a byte, the entire result will
3462 * have to be in UTF-8. Assume worst case sizing in
3463 * conversion. (all latin1 characters occupy at most two bytes
3464 * in utf8) */
3465 if (title_ord > 255) {
3466 doing_utf8 = TRUE;
3467 convert_source_to_utf8 = TRUE;
3468 need = slen * 2 + 1;
3469
3470 /* The (converted) UTF-8 and UTF-EBCDIC lengths of all
3471 * (both) characters whose title case is above 255 is
3472 * 2. */
3473 ulen = 2;
3474 }
3475 else { /* LATIN_SMALL_LETTER_SHARP_S expands by 1 byte */
3476 need = slen + 1 + 1;
3477 }
00f254e2 3478 }
167d19f2 3479 }
00f254e2
KW		 3480 } /* End of use Unicode (Latin1) semantics */
3481 } /* End of changing the case of the first character */
3482
3483 /* Here, have the first character's changed case stored in tmpbuf. Ready to
3484 * generate the result */
3485 if (inplace) {
3486
3487 /* We can convert in place. This means we change just the first
3488 * character without disturbing the rest; no need to grow */
d54190f6
NC		 3489 dest = source;
3490 s = d = (U8*)SvPV_force_nomg(source, slen);
3491 } else {
3492 dTARGET;
3493
3494 dest = TARG;
3495
00f254e2
KW		 3496 /* Here, we can't convert in place; we earlier calculated how much
3497 * space we will need, so grow to accommodate that */
d54190f6 3498 SvUPGRADE(dest, SVt_PV);
3b416f41 3499 d = (U8*)SvGROW(dest, need);
d54190f6
NC		 3500 (void)SvPOK_only(dest);
3501
3502 SETs(dest);
d54190f6 3503 }
44bc797b 3504
d54190f6 3505 if (doing_utf8) {
00f254e2
KW		 3506 if (! inplace) {
3507 if (! convert_source_to_utf8) {
3508
3509 /* Here both source and dest are in UTF-8, but have to create
3510 * the entire output. We initialize the result to be the
3511 * title/lower cased first character, and then append the rest
3512 * of the string. */
3513 sv_setpvn(dest, (char*)tmpbuf, tculen);
3514 if (slen > ulen) {
3515 sv_catpvn(dest, (char*)(s + ulen), slen - ulen);
3516 }
3517 }
3518 else {
3519 const U8 *const send = s + slen;
3520
3521 /* Here the dest needs to be in UTF-8, but the source isn't,
3522 * except we earlier UTF-8'd the first character of the source
3523 * into tmpbuf. First put that into dest, and then append the
3524 * rest of the source, converting it to UTF-8 as we go. */
3525
3526 /* Assert tculen is 2 here because the only two characters that
3527 * get to this part of the code have 2-byte UTF-8 equivalents */
3528 *d++ = *tmpbuf;
3529 *d++ = *(tmpbuf + 1);
3530 s++; /* We have just processed the 1st char */
3531
3532 for (; s < send; s++) {
3533 d = uvchr_to_utf8(d, *s);
3534 }
3535 *d = '\0';
3536 SvCUR_set(dest, d - (U8*)SvPVX_const(dest));
3537 }
d54190f6 3538 SvUTF8_on(dest);
a0ed51b3 3539 }
00f254e2 3540 else { /* in-place UTF-8. Just overwrite the first character */
d54190f6
NC		 3541 Copy(tmpbuf, d, tculen, U8);
3542 SvCUR_set(dest, need - 1);
a0ed51b3 3543 }
094a2f8c
KW		 3544
3545 if (tainted) {
3546 TAINT;
3547 SvTAINTED_on(dest);
3548 }
a0ed51b3 3549 }
00f254e2
KW		 3550 else { /* Neither source nor dest are in or need to be UTF-8 */
3551 if (slen) {
2de3dbcc 3552 if (IN_LOCALE_RUNTIME) {
31351b04 3553 TAINT;
d54190f6 3554 SvTAINTED_on(dest);
31351b04 3555 }
00f254e2
KW		 3556 if (inplace) { /* in-place, only need to change the 1st char */
3557 *d = *tmpbuf;
3558 }
3559 else { /* Not in-place */
3560
3561 /* Copy the case-changed character(s) from tmpbuf */
3562 Copy(tmpbuf, d, tculen, U8);
3563 d += tculen - 1; /* Code below expects d to point to final
3564 * character stored */
3565 }
3566 }
3567 else { /* empty source */
3568 /* See bug #39028: Don't taint if empty */
d54190f6
NC		 3569 *d = *s;
3570 }
3571
00f254e2
KW		 3572 /* In a "use bytes" we don't treat the source as UTF-8, but, still want
3573 * the destination to retain that flag */
d54190f6
NC		 3574 if (SvUTF8(source))
3575 SvUTF8_on(dest);
3576
00f254e2 3577 if (!inplace) { /* Finish the rest of the string, unchanged */
d54190f6
NC		 3578 /* This will copy the trailing NUL */
3579 Copy(s + 1, d + 1, slen, U8);
3580 SvCUR_set(dest, need - 1);
bbce6d69 3581 }
bbce6d69 3582 }
539689e7
FC		 3583 if (dest != source && SvTAINTED(source))
3584 SvTAINT(dest);
d54190f6 3585 SvSETMAGIC(dest);
79072805
LW		 3586 RETURN;
3587}
3588
67306194
NC		 3589/* There's so much setup/teardown code common between uc and lc, I wonder if
3590 it would be worth merging the two, and just having a switch outside each
00f254e2 3591 of the three tight loops. There is less and less commonality though */
79072805
LW		 3592PP(pp_uc)
3593{
97aff369 3594 dVAR;
39644a26 3595 dSP;
67306194 3596 SV *source = TOPs;
463ee0b2 3597 STRLEN len;
67306194
NC		 3598 STRLEN min;
3599 SV *dest;
3600 const U8 *s;
3601 U8 *d;
79072805 3602
67306194
NC		 3603 SvGETMAGIC(source);
3604
3605 if (SvPADTMP(source) && !SvREADONLY(source) && !SvAMAGIC(source)
00f254e2
KW		 3606 && SvTEMP(source) && !DO_UTF8(source)
3607 && (IN_LOCALE_RUNTIME || ! IN_UNI_8_BIT)) {
3608
3609 /* We can convert in place. The reason we can't if in UNI_8_BIT is to
3610 * make the loop tight, so we overwrite the source with the dest before
3611 * looking at it, and we need to look at the original source
3612 * afterwards. There would also need to be code added to handle
3613 * switching to not in-place in midstream if we run into characters
3614 * that change the length.
3615 */
67306194
NC		 3616 dest = source;
3617 s = d = (U8*)SvPV_force_nomg(source, len);
3618 min = len + 1;
3619 } else {
a0ed51b3 3620 dTARGET;
a0ed51b3 3621
67306194 3622 dest = TARG;
128c9517 3623
67306194
NC		 3624 /* The old implementation would copy source into TARG at this point.
3625 This had the side effect that if source was undef, TARG was now
3626 an undefined SV with PADTMP set, and they don't warn inside
3627 sv_2pv_flags(). However, we're now getting the PV direct from
3628 source, which doesn't have PADTMP set, so it would warn. Hence the
3629 little games. */
3630
3631 if (SvOK(source)) {
3632 s = (const U8*)SvPV_nomg_const(source, len);
3633 } else {
0a0ffbce
RGS		 3634 if (ckWARN(WARN_UNINITIALIZED))
3635 report_uninit(source);
1eced8f8 3636 s = (const U8*)"";
67306194 3637 len = 0;
a0ed51b3 3638 }