| 1 |
/* universal.c |
| 2 |
* |
| 3 |
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, |
| 4 |
* 2005, by Larry Wall and others |
| 5 |
* |
| 6 |
* You may distribute under the terms of either the GNU General Public |
| 7 |
* License or the Artistic License, as specified in the README file. |
| 8 |
* |
| 9 |
*/ |
| 10 |
|
| 11 |
/* |
| 12 |
* "The roots of those mountains must be roots indeed; there must be |
| 13 |
* great secrets buried there which have not been discovered since the |
| 14 |
* beginning." --Gandalf, relating Gollum's story |
| 15 |
*/ |
| 16 |
|
| 17 |
/* This file contains the code that implements the functions in Perl's |
| 18 |
* UNIVERSAL package, such as UNIVERSAL->can(). |
| 19 |
*/ |
| 20 |
|
| 21 |
#include "EXTERN.h" |
| 22 |
#define PERL_IN_UNIVERSAL_C |
| 23 |
#include "perl.h" |
| 24 |
|
| 25 |
#ifdef USE_PERLIO |
| 26 |
#include "perliol.h" /* For the PERLIO_F_XXX */ |
| 27 |
#endif |
| 28 |
|
| 29 |
/* |
| 30 |
* Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> |
| 31 |
* The main guts of traverse_isa was actually copied from gv_fetchmeth |
| 32 |
*/ |
| 33 |
|
| 34 |
STATIC SV * |
| 35 |
S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash, |
| 36 |
int len, int level) |
| 37 |
{ |
| 38 |
AV* av; |
| 39 |
GV* gv; |
| 40 |
GV** gvp; |
| 41 |
HV* hv = Nullhv; |
| 42 |
SV* subgen = Nullsv; |
| 43 |
|
| 44 |
/* A stash/class can go by many names (ie. User == main::User), so |
| 45 |
we compare the stash itself just in case */ |
| 46 |
if (name_stash && (stash == name_stash)) |
| 47 |
return &PL_sv_yes; |
| 48 |
|
| 49 |
if (strEQ(HvNAME(stash), name)) |
| 50 |
return &PL_sv_yes; |
| 51 |
|
| 52 |
if (strEQ(name, "UNIVERSAL")) |
| 53 |
return &PL_sv_yes; |
| 54 |
|
| 55 |
if (level > 100) |
| 56 |
Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
| 57 |
HvNAME(stash)); |
| 58 |
|
| 59 |
gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); |
| 60 |
|
| 61 |
if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv)) |
| 62 |
&& (hv = GvHV(gv))) |
| 63 |
{ |
| 64 |
if (SvIV(subgen) == (IV)PL_sub_generation) { |
| 65 |
SV* sv; |
| 66 |
SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); |
| 67 |
if (svp && (sv = *svp) != (SV*)&PL_sv_undef) { |
| 68 |
DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n", |
| 69 |
name, HvNAME(stash)) ); |
| 70 |
return sv; |
| 71 |
} |
| 72 |
} |
| 73 |
else { |
| 74 |
DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n", |
| 75 |
HvNAME(stash)) ); |
| 76 |
hv_clear(hv); |
| 77 |
sv_setiv(subgen, PL_sub_generation); |
| 78 |
} |
| 79 |
} |
| 80 |
|
| 81 |
gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); |
| 82 |
|
| 83 |
if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
| 84 |
if (!hv || !subgen) { |
| 85 |
gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); |
| 86 |
|
| 87 |
gv = *gvp; |
| 88 |
|
| 89 |
if (SvTYPE(gv) != SVt_PVGV) |
| 90 |
gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); |
| 91 |
|
| 92 |
if (!hv) |
| 93 |
hv = GvHVn(gv); |
| 94 |
if (!subgen) { |
| 95 |
subgen = newSViv(PL_sub_generation); |
| 96 |
GvSV(gv) = subgen; |
| 97 |
} |
| 98 |
} |
| 99 |
if (hv) { |
| 100 |
SV** svp = AvARRAY(av); |
| 101 |
/* NOTE: No support for tied ISA */ |
| 102 |
I32 items = AvFILLp(av) + 1; |
| 103 |
while (items--) { |
| 104 |
SV* sv = *svp++; |
| 105 |
HV* basestash = gv_stashsv(sv, FALSE); |
| 106 |
if (!basestash) { |
| 107 |
if (ckWARN(WARN_MISC)) |
| 108 |
Perl_warner(aTHX_ packWARN(WARN_SYNTAX), |
| 109 |
"Can't locate package %"SVf" for @%s::ISA", |
| 110 |
sv, HvNAME(stash)); |
| 111 |
continue; |
| 112 |
} |
| 113 |
if (&PL_sv_yes == isa_lookup(basestash, name, name_stash, |
| 114 |
len, level + 1)) { |
| 115 |
(void)hv_store(hv,name,len,&PL_sv_yes,0); |
| 116 |
return &PL_sv_yes; |
| 117 |
} |
| 118 |
} |
| 119 |
(void)hv_store(hv,name,len,&PL_sv_no,0); |
| 120 |
} |
| 121 |
} |
| 122 |
return &PL_sv_no; |
| 123 |
} |
| 124 |
|
| 125 |
/* |
| 126 |
=head1 SV Manipulation Functions |
| 127 |
|
| 128 |
=for apidoc sv_derived_from |
| 129 |
|
| 130 |
Returns a boolean indicating whether the SV is derived from the specified |
| 131 |
class. This is the function that implements C<UNIVERSAL::isa>. It works |
| 132 |
for class names as well as for objects. |
| 133 |
|
| 134 |
=cut |
| 135 |
*/ |
| 136 |
|
| 137 |
bool |
| 138 |
Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
| 139 |
{ |
| 140 |
char *type; |
| 141 |
HV *stash; |
| 142 |
HV *name_stash; |
| 143 |
|
| 144 |
stash = Nullhv; |
| 145 |
type = Nullch; |
| 146 |
|
| 147 |
if (SvGMAGICAL(sv)) |
| 148 |
mg_get(sv) ; |
| 149 |
|
| 150 |
if (SvROK(sv)) { |
| 151 |
sv = SvRV(sv); |
| 152 |
type = sv_reftype(sv,0); |
| 153 |
if (SvOBJECT(sv)) |
| 154 |
stash = SvSTASH(sv); |
| 155 |
} |
| 156 |
else { |
| 157 |
stash = gv_stashsv(sv, FALSE); |
| 158 |
} |
| 159 |
|
| 160 |
name_stash = gv_stashpv(name, FALSE); |
| 161 |
|
| 162 |
return (type && strEQ(type,name)) || |
| 163 |
(stash && isa_lookup(stash, name, name_stash, strlen(name), 0) |
| 164 |
== &PL_sv_yes) |
| 165 |
? TRUE |
| 166 |
: FALSE ; |
| 167 |
} |
| 168 |
|
| 169 |
#include "XSUB.h" |
| 170 |
|
| 171 |
void XS_UNIVERSAL_isa(pTHX_ CV *cv); |
| 172 |
void XS_UNIVERSAL_can(pTHX_ CV *cv); |
| 173 |
void XS_UNIVERSAL_VERSION(pTHX_ CV *cv); |
| 174 |
XS(XS_utf8_is_utf8); |
| 175 |
XS(XS_utf8_valid); |
| 176 |
XS(XS_utf8_encode); |
| 177 |
XS(XS_utf8_decode); |
| 178 |
XS(XS_utf8_upgrade); |
| 179 |
XS(XS_utf8_downgrade); |
| 180 |
XS(XS_utf8_unicode_to_native); |
| 181 |
XS(XS_utf8_native_to_unicode); |
| 182 |
XS(XS_Internals_SvREADONLY); |
| 183 |
XS(XS_Internals_SvREFCNT); |
| 184 |
XS(XS_Internals_hv_clear_placehold); |
| 185 |
XS(XS_PerlIO_get_layers); |
| 186 |
XS(XS_Regexp_DESTROY); |
| 187 |
XS(XS_Internals_hash_seed); |
| 188 |
XS(XS_Internals_rehash_seed); |
| 189 |
XS(XS_Internals_HvREHASH); |
| 190 |
|
| 191 |
void |
| 192 |
Perl_boot_core_UNIVERSAL(pTHX) |
| 193 |
{ |
| 194 |
char *file = __FILE__; |
| 195 |
|
| 196 |
newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
| 197 |
newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
| 198 |
newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
| 199 |
newXS("utf8::is_utf8", XS_utf8_is_utf8, file); |
| 200 |
newXS("utf8::valid", XS_utf8_valid, file); |
| 201 |
newXS("utf8::encode", XS_utf8_encode, file); |
| 202 |
newXS("utf8::decode", XS_utf8_decode, file); |
| 203 |
newXS("utf8::upgrade", XS_utf8_upgrade, file); |
| 204 |
newXS("utf8::downgrade", XS_utf8_downgrade, file); |
| 205 |
newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file); |
| 206 |
newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file); |
| 207 |
newXSproto("Internals::SvREADONLY",XS_Internals_SvREADONLY, file, "\\[$%@];$"); |
| 208 |
newXSproto("Internals::SvREFCNT",XS_Internals_SvREFCNT, file, "\\[$%@];$"); |
| 209 |
newXSproto("Internals::hv_clear_placeholders", |
| 210 |
XS_Internals_hv_clear_placehold, file, "\\%"); |
| 211 |
newXSproto("PerlIO::get_layers", |
| 212 |
XS_PerlIO_get_layers, file, "*;@"); |
| 213 |
newXS("Regexp::DESTROY", XS_Regexp_DESTROY, file); |
| 214 |
newXSproto("Internals::hash_seed",XS_Internals_hash_seed, file, ""); |
| 215 |
newXSproto("Internals::rehash_seed",XS_Internals_rehash_seed, file, ""); |
| 216 |
newXSproto("Internals::HvREHASH", XS_Internals_HvREHASH, file, "\\%"); |
| 217 |
} |
| 218 |
|
| 219 |
|
| 220 |
XS(XS_UNIVERSAL_isa) |
| 221 |
{ |
| 222 |
dXSARGS; |
| 223 |
SV *sv; |
| 224 |
char *name; |
| 225 |
STRLEN n_a; |
| 226 |
|
| 227 |
if (items != 2) |
| 228 |
Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
| 229 |
|
| 230 |
sv = ST(0); |
| 231 |
|
| 232 |
if (SvGMAGICAL(sv)) |
| 233 |
mg_get(sv); |
| 234 |
|
| 235 |
if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)) |
| 236 |
|| (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv)))) |
| 237 |
XSRETURN_UNDEF; |
| 238 |
|
| 239 |
name = (char *)SvPV(ST(1),n_a); |
| 240 |
|
| 241 |
ST(0) = boolSV(sv_derived_from(sv, name)); |
| 242 |
XSRETURN(1); |
| 243 |
} |
| 244 |
|
| 245 |
XS(XS_UNIVERSAL_can) |
| 246 |
{ |
| 247 |
dXSARGS; |
| 248 |
SV *sv; |
| 249 |
char *name; |
| 250 |
SV *rv; |
| 251 |
HV *pkg = NULL; |
| 252 |
STRLEN n_a; |
| 253 |
|
| 254 |
if (items != 2) |
| 255 |
Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
| 256 |
|
| 257 |
sv = ST(0); |
| 258 |
|
| 259 |
if (SvGMAGICAL(sv)) |
| 260 |
mg_get(sv); |
| 261 |
|
| 262 |
if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)) |
| 263 |
|| (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv)))) |
| 264 |
XSRETURN_UNDEF; |
| 265 |
|
| 266 |
name = (char *)SvPV(ST(1),n_a); |
| 267 |
rv = &PL_sv_undef; |
| 268 |
|
| 269 |
if (SvROK(sv)) { |
| 270 |
sv = (SV*)SvRV(sv); |
| 271 |
if (SvOBJECT(sv)) |
| 272 |
pkg = SvSTASH(sv); |
| 273 |
} |
| 274 |
else { |
| 275 |
pkg = gv_stashsv(sv, FALSE); |
| 276 |
} |
| 277 |
|
| 278 |
if (pkg) { |
| 279 |
GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
| 280 |
if (gv && isGV(gv)) |
| 281 |
rv = sv_2mortal(newRV((SV*)GvCV(gv))); |
| 282 |
} |
| 283 |
|
| 284 |
ST(0) = rv; |
| 285 |
XSRETURN(1); |
| 286 |
} |
| 287 |
|
| 288 |
XS(XS_UNIVERSAL_VERSION) |
| 289 |
{ |
| 290 |
dXSARGS; |
| 291 |
HV *pkg; |
| 292 |
GV **gvp; |
| 293 |
GV *gv; |
| 294 |
SV *sv; |
| 295 |
char *undef; |
| 296 |
|
| 297 |
if (SvROK(ST(0))) { |
| 298 |
sv = (SV*)SvRV(ST(0)); |
| 299 |
if (!SvOBJECT(sv)) |
| 300 |
Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
| 301 |
pkg = SvSTASH(sv); |
| 302 |
} |
| 303 |
else { |
| 304 |
pkg = gv_stashsv(ST(0), FALSE); |
| 305 |
} |
| 306 |
|
| 307 |
gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
| 308 |
|
| 309 |
if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
| 310 |
SV *nsv = sv_newmortal(); |
| 311 |
sv_setsv(nsv, sv); |
| 312 |
sv = nsv; |
| 313 |
undef = Nullch; |
| 314 |
} |
| 315 |
else { |
| 316 |
sv = (SV*)&PL_sv_undef; |
| 317 |
undef = "(undef)"; |
| 318 |
} |
| 319 |
|
| 320 |
if (items > 1) { |
| 321 |
STRLEN len; |
| 322 |
SV *req = ST(1); |
| 323 |
|
| 324 |
if (undef) { |
| 325 |
if (pkg) |
| 326 |
Perl_croak(aTHX_ |
| 327 |
"%s does not define $%s::VERSION--version check failed", |
| 328 |
HvNAME(pkg), HvNAME(pkg)); |
| 329 |
else { |
| 330 |
char *str = SvPVx(ST(0), len); |
| 331 |
|
| 332 |
Perl_croak(aTHX_ |
| 333 |
"%s defines neither package nor VERSION--version check failed", str); |
| 334 |
} |
| 335 |
} |
| 336 |
if (!SvNIOK(sv) && SvPOK(sv)) { |
| 337 |
char *str = SvPVx(sv,len); |
| 338 |
while (len) { |
| 339 |
--len; |
| 340 |
/* XXX could DWIM "1.2.3" here */ |
| 341 |
if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') |
| 342 |
break; |
| 343 |
} |
| 344 |
if (len) { |
| 345 |
if (SvNOK(req) && SvPOK(req)) { |
| 346 |
/* they said C<use Foo v1.2.3> and $Foo::VERSION |
| 347 |
* doesn't look like a float: do string compare */ |
| 348 |
if (sv_cmp(req,sv) == 1) { |
| 349 |
Perl_croak(aTHX_ "%s v%"VDf" required--" |
| 350 |
"this is only v%"VDf, |
| 351 |
HvNAME(pkg), req, sv); |
| 352 |
} |
| 353 |
goto finish; |
| 354 |
} |
| 355 |
/* they said C<use Foo 1.002_003> and $Foo::VERSION |
| 356 |
* doesn't look like a float: force numeric compare */ |
| 357 |
(void)SvUPGRADE(sv, SVt_PVNV); |
| 358 |
SvNVX(sv) = str_to_version(sv); |
| 359 |
SvPOK_off(sv); |
| 360 |
SvNOK_on(sv); |
| 361 |
} |
| 362 |
} |
| 363 |
/* if we get here, we're looking for a numeric comparison, |
| 364 |
* so force the required version into a float, even if they |
| 365 |
* said C<use Foo v1.2.3> */ |
| 366 |
if (SvNOK(req) && SvPOK(req)) { |
| 367 |
NV n = SvNV(req); |
| 368 |
req = sv_newmortal(); |
| 369 |
sv_setnv(req, n); |
| 370 |
} |
| 371 |
|
| 372 |
if (SvNV(req) > SvNV(sv)) |
| 373 |
Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
| 374 |
HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv)); |
| 375 |
} |
| 376 |
|
| 377 |
finish: |
| 378 |
ST(0) = sv; |
| 379 |
|
| 380 |
XSRETURN(1); |
| 381 |
} |
| 382 |
|
| 383 |
XS(XS_utf8_is_utf8) |
| 384 |
{ |
| 385 |
dXSARGS; |
| 386 |
if (items != 1) |
| 387 |
Perl_croak(aTHX_ "Usage: utf8::is_utf8(sv)"); |
| 388 |
{ |
| 389 |
SV * sv = ST(0); |
| 390 |
{ |
| 391 |
if (SvUTF8(sv)) |
| 392 |
XSRETURN_YES; |
| 393 |
else |
| 394 |
XSRETURN_NO; |
| 395 |
} |
| 396 |
} |
| 397 |
XSRETURN_EMPTY; |
| 398 |
} |
| 399 |
|
| 400 |
XS(XS_utf8_valid) |
| 401 |
{ |
| 402 |
dXSARGS; |
| 403 |
if (items != 1) |
| 404 |
Perl_croak(aTHX_ "Usage: utf8::valid(sv)"); |
| 405 |
{ |
| 406 |
SV * sv = ST(0); |
| 407 |
{ |
| 408 |
STRLEN len; |
| 409 |
char *s = SvPV(sv,len); |
| 410 |
if (!SvUTF8(sv) || is_utf8_string((U8*)s,len)) |
| 411 |
XSRETURN_YES; |
| 412 |
else |
| 413 |
XSRETURN_NO; |
| 414 |
} |
| 415 |
} |
| 416 |
XSRETURN_EMPTY; |
| 417 |
} |
| 418 |
|
| 419 |
XS(XS_utf8_encode) |
| 420 |
{ |
| 421 |
dXSARGS; |
| 422 |
if (items != 1) |
| 423 |
Perl_croak(aTHX_ "Usage: utf8::encode(sv)"); |
| 424 |
{ |
| 425 |
SV * sv = ST(0); |
| 426 |
|
| 427 |
sv_utf8_encode(sv); |
| 428 |
} |
| 429 |
XSRETURN_EMPTY; |
| 430 |
} |
| 431 |
|
| 432 |
XS(XS_utf8_decode) |
| 433 |
{ |
| 434 |
dXSARGS; |
| 435 |
if (items != 1) |
| 436 |
Perl_croak(aTHX_ "Usage: utf8::decode(sv)"); |
| 437 |
{ |
| 438 |
SV * sv = ST(0); |
| 439 |
bool RETVAL; |
| 440 |
|
| 441 |
RETVAL = sv_utf8_decode(sv); |
| 442 |
ST(0) = boolSV(RETVAL); |
| 443 |
sv_2mortal(ST(0)); |
| 444 |
} |
| 445 |
XSRETURN(1); |
| 446 |
} |
| 447 |
|
| 448 |
XS(XS_utf8_upgrade) |
| 449 |
{ |
| 450 |
dXSARGS; |
| 451 |
if (items != 1) |
| 452 |
Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)"); |
| 453 |
{ |
| 454 |
SV * sv = ST(0); |
| 455 |
STRLEN RETVAL; |
| 456 |
dXSTARG; |
| 457 |
|
| 458 |
RETVAL = sv_utf8_upgrade(sv); |
| 459 |
XSprePUSH; PUSHi((IV)RETVAL); |
| 460 |
} |
| 461 |
XSRETURN(1); |
| 462 |
} |
| 463 |
|
| 464 |
XS(XS_utf8_downgrade) |
| 465 |
{ |
| 466 |
dXSARGS; |
| 467 |
if (items < 1 || items > 2) |
| 468 |
Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)"); |
| 469 |
{ |
| 470 |
SV * sv = ST(0); |
| 471 |
bool failok; |
| 472 |
bool RETVAL; |
| 473 |
|
| 474 |
if (items < 2) |
| 475 |
failok = 0; |
| 476 |
else { |
| 477 |
failok = (int)SvIV(ST(1)); |
| 478 |
} |
| 479 |
|
| 480 |
RETVAL = sv_utf8_downgrade(sv, failok); |
| 481 |
ST(0) = boolSV(RETVAL); |
| 482 |
sv_2mortal(ST(0)); |
| 483 |
} |
| 484 |
XSRETURN(1); |
| 485 |
} |
| 486 |
|
| 487 |
XS(XS_utf8_native_to_unicode) |
| 488 |
{ |
| 489 |
dXSARGS; |
| 490 |
UV uv = SvUV(ST(0)); |
| 491 |
|
| 492 |
if (items > 1) |
| 493 |
Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)"); |
| 494 |
|
| 495 |
ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv))); |
| 496 |
XSRETURN(1); |
| 497 |
} |
| 498 |
|
| 499 |
XS(XS_utf8_unicode_to_native) |
| 500 |
{ |
| 501 |
dXSARGS; |
| 502 |
UV uv = SvUV(ST(0)); |
| 503 |
|
| 504 |
if (items > 1) |
| 505 |
Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)"); |
| 506 |
|
| 507 |
ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv))); |
| 508 |
XSRETURN(1); |
| 509 |
} |
| 510 |
|
| 511 |
XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */ |
| 512 |
{ |
| 513 |
dXSARGS; |
| 514 |
SV *sv = SvRV(ST(0)); |
| 515 |
if (items == 1) { |
| 516 |
if (SvREADONLY(sv)) |
| 517 |
XSRETURN_YES; |
| 518 |
else |
| 519 |
XSRETURN_NO; |
| 520 |
} |
| 521 |
else if (items == 2) { |
| 522 |
if (SvTRUE(ST(1))) { |
| 523 |
SvREADONLY_on(sv); |
| 524 |
XSRETURN_YES; |
| 525 |
} |
| 526 |
else { |
| 527 |
/* I hope you really know what you are doing. */ |
| 528 |
SvREADONLY_off(sv); |
| 529 |
XSRETURN_NO; |
| 530 |
} |
| 531 |
} |
| 532 |
XSRETURN_UNDEF; /* Can't happen. */ |
| 533 |
} |
| 534 |
|
| 535 |
XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */ |
| 536 |
{ |
| 537 |
dXSARGS; |
| 538 |
SV *sv = SvRV(ST(0)); |
| 539 |
if (items == 1) |
| 540 |
XSRETURN_IV(SvREFCNT(sv) - 1); /* Minus the ref created for us. */ |
| 541 |
else if (items == 2) { |
| 542 |
/* I hope you really know what you are doing. */ |
| 543 |
SvREFCNT(sv) = SvIV(ST(1)); |
| 544 |
XSRETURN_IV(SvREFCNT(sv)); |
| 545 |
} |
| 546 |
XSRETURN_UNDEF; /* Can't happen. */ |
| 547 |
} |
| 548 |
|
| 549 |
XS(XS_Internals_hv_clear_placehold) |
| 550 |
{ |
| 551 |
dXSARGS; |
| 552 |
HV *hv = (HV *) SvRV(ST(0)); |
| 553 |
if (items != 1) |
| 554 |
Perl_croak(aTHX_ "Usage: UNIVERSAL::hv_clear_placeholders(hv)"); |
| 555 |
hv_clear_placeholders(hv); |
| 556 |
XSRETURN(0); |
| 557 |
} |
| 558 |
|
| 559 |
XS(XS_Regexp_DESTROY) |
| 560 |
{ |
| 561 |
|
| 562 |
} |
| 563 |
|
| 564 |
XS(XS_PerlIO_get_layers) |
| 565 |
{ |
| 566 |
dXSARGS; |
| 567 |
if (items < 1 || items % 2 == 0) |
| 568 |
Perl_croak(aTHX_ "Usage: PerlIO_get_layers(filehandle[,args])"); |
| 569 |
#ifdef USE_PERLIO |
| 570 |
{ |
| 571 |
SV * sv; |
| 572 |
GV * gv; |
| 573 |
IO * io; |
| 574 |
bool input = TRUE; |
| 575 |
bool details = FALSE; |
| 576 |
|
| 577 |
if (items > 1) { |
| 578 |
SV **svp; |
| 579 |
|
| 580 |
for (svp = MARK + 2; svp <= SP; svp += 2) { |
| 581 |
SV **varp = svp; |
| 582 |
SV **valp = svp + 1; |
| 583 |
STRLEN klen; |
| 584 |
char *key = SvPV(*varp, klen); |
| 585 |
|
| 586 |
switch (*key) { |
| 587 |
case 'i': |
| 588 |
if (klen == 5 && memEQ(key, "input", 5)) { |
| 589 |
input = SvTRUE(*valp); |
| 590 |
break; |
| 591 |
} |
| 592 |
goto fail; |
| 593 |
case 'o': |
| 594 |
if (klen == 6 && memEQ(key, "output", 6)) { |
| 595 |
input = !SvTRUE(*valp); |
| 596 |
break; |
| 597 |
} |
| 598 |
goto fail; |
| 599 |
case 'd': |
| 600 |
if (klen == 7 && memEQ(key, "details", 7)) { |
| 601 |
details = SvTRUE(*valp); |
| 602 |
break; |
| 603 |
} |
| 604 |
goto fail; |
| 605 |
default: |
| 606 |
fail: |
| 607 |
Perl_croak(aTHX_ |
| 608 |
"get_layers: unknown argument '%s'", |
| 609 |
key); |
| 610 |
} |
| 611 |
} |
| 612 |
|
| 613 |
SP -= (items - 1); |
| 614 |
} |
| 615 |
|
| 616 |
sv = POPs; |
| 617 |
gv = (GV*)sv; |
| 618 |
|
| 619 |
if (!isGV(sv)) { |
| 620 |
if (SvROK(sv) && isGV(SvRV(sv))) |
| 621 |
gv = (GV*)SvRV(sv); |
| 622 |
else |
| 623 |
gv = gv_fetchpv(SvPVX(sv), FALSE, SVt_PVIO); |
| 624 |
} |
| 625 |
|
| 626 |
if (gv && (io = GvIO(gv))) { |
| 627 |
dTARGET; |
| 628 |
AV* av = PerlIO_get_layers(aTHX_ input ? |
| 629 |
IoIFP(io) : IoOFP(io)); |
| 630 |
I32 i; |
| 631 |
I32 last = av_len(av); |
| 632 |
I32 nitem = 0; |
| 633 |
|
| 634 |
for (i = last; i >= 0; i -= 3) { |
| 635 |
SV **namsvp; |
| 636 |
SV **argsvp; |
| 637 |
SV **flgsvp; |
| 638 |
bool namok, argok, flgok; |
| 639 |
|
| 640 |
namsvp = av_fetch(av, i - 2, FALSE); |
| 641 |
argsvp = av_fetch(av, i - 1, FALSE); |
| 642 |
flgsvp = av_fetch(av, i, FALSE); |
| 643 |
|
| 644 |
namok = namsvp && *namsvp && SvPOK(*namsvp); |
| 645 |
argok = argsvp && *argsvp && SvPOK(*argsvp); |
| 646 |
flgok = flgsvp && *flgsvp && SvIOK(*flgsvp); |
| 647 |
|
| 648 |
if (details) { |
| 649 |
XPUSHs(namok ? |
| 650 |
newSVpv(SvPVX(*namsvp), 0) : &PL_sv_undef); |
| 651 |
XPUSHs(argok ? |
| 652 |
newSVpv(SvPVX(*argsvp), 0) : &PL_sv_undef); |
| 653 |
if (flgok) |
| 654 |
XPUSHi(SvIVX(*flgsvp)); |
| 655 |
else |
| 656 |
XPUSHs(&PL_sv_undef); |
| 657 |
nitem += 3; |
| 658 |
} |
| 659 |
else { |
| 660 |
if (namok && argok) |
| 661 |
XPUSHs(Perl_newSVpvf(aTHX_ "%"SVf"(%"SVf")", |
| 662 |
*namsvp, *argsvp)); |
| 663 |
else if (namok) |
| 664 |
XPUSHs(Perl_newSVpvf(aTHX_ "%"SVf, *namsvp)); |
| 665 |
else |
| 666 |
XPUSHs(&PL_sv_undef); |
| 667 |
nitem++; |
| 668 |
if (flgok) { |
| 669 |
IV flags = SvIVX(*flgsvp); |
| 670 |
|
| 671 |
if (flags & PERLIO_F_UTF8) { |
| 672 |
XPUSHs(newSVpvn("utf8", 4)); |
| 673 |
nitem++; |
| 674 |
} |
| 675 |
} |
| 676 |
} |
| 677 |
} |
| 678 |
|
| 679 |
SvREFCNT_dec(av); |
| 680 |
|
| 681 |
XSRETURN(nitem); |
| 682 |
} |
| 683 |
} |
| 684 |
#endif |
| 685 |
|
| 686 |
XSRETURN(0); |
| 687 |
} |
| 688 |
|
| 689 |
XS(XS_Internals_hash_seed) |
| 690 |
{ |
| 691 |
/* Using dXSARGS would also have dITEM and dSP, |
| 692 |
* which define 2 unused local variables. */ |
| 693 |
dMARK; dAX; |
| 694 |
XSRETURN_UV(PERL_HASH_SEED); |
| 695 |
} |
| 696 |
|
| 697 |
XS(XS_Internals_rehash_seed) |
| 698 |
{ |
| 699 |
/* Using dXSARGS would also have dITEM and dSP, |
| 700 |
* which define 2 unused local variables. */ |
| 701 |
dMARK; dAX; |
| 702 |
XSRETURN_UV(PL_rehash_seed); |
| 703 |
} |
| 704 |
|
| 705 |
XS(XS_Internals_HvREHASH) /* Subject to change */ |
| 706 |
{ |
| 707 |
dXSARGS; |
| 708 |
if (SvROK(ST(0))) { |
| 709 |
HV *hv = (HV *) SvRV(ST(0)); |
| 710 |
if (items == 1 && SvTYPE(hv) == SVt_PVHV) { |
| 711 |
if (HvREHASH(hv)) |
| 712 |
XSRETURN_YES; |
| 713 |
else |
| 714 |
XSRETURN_NO; |
| 715 |
} |
| 716 |
} |
| 717 |
Perl_croak(aTHX_ "Internals::HvREHASH $hashref"); |
| 718 |
} |
| 719 |
|
| 720 |
/* |
| 721 |
* Local variables: |
| 722 |
* c-indentation-style: bsd |
| 723 |
* c-basic-offset: 4 |
| 724 |
* indent-tabs-mode: t |
| 725 |
* End: |
| 726 |
* |
| 727 |
* vim: shiftwidth=4: |
| 728 |
*/ |
