Commit | Line | Data |
---|---|---|
d6376244 JH |
1 | /* universal.c |
2 | * | |
e6906430 JH |
3 | * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, |
4 | * by Larry Wall and others | |
d6376244 JH |
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 | ||
d31a8517 AT |
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 | ||
6d4a7be2 | 17 | #include "EXTERN.h" |
864dbfa3 | 18 | #define PERL_IN_UNIVERSAL_C |
6d4a7be2 | 19 | #include "perl.h" |
6d4a7be2 | 20 | |
5095c3e6 JH |
21 | #ifdef USE_PERLIO |
22 | #include "perliol.h" /* For the PERLIO_F_XXX */ | |
23 | #endif | |
24 | ||
6d4a7be2 | 25 | /* |
26 | * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> | |
27 | * The main guts of traverse_isa was actually copied from gv_fetchmeth | |
28 | */ | |
29 | ||
76e3520e | 30 | STATIC SV * |
301daebc MS |
31 | S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash, |
32 | int len, int level) | |
6d4a7be2 | 33 | { |
34 | AV* av; | |
35 | GV* gv; | |
36 | GV** gvp; | |
37 | HV* hv = Nullhv; | |
46e4b22b | 38 | SV* subgen = Nullsv; |
6d4a7be2 | 39 | |
301daebc MS |
40 | /* A stash/class can go by many names (ie. User == main::User), so |
41 | we compare the stash itself just in case */ | |
42 | if (name_stash && (stash == name_stash)) | |
43 | return &PL_sv_yes; | |
6d4a7be2 | 44 | |
46e4b22b | 45 | if (strEQ(HvNAME(stash), name)) |
3280af22 | 46 | return &PL_sv_yes; |
6d4a7be2 | 47 | |
48 | if (level > 100) | |
46e4b22b GS |
49 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
50 | HvNAME(stash)); | |
6d4a7be2 | 51 | |
52 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); | |
53 | ||
46e4b22b GS |
54 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv)) |
55 | && (hv = GvHV(gv))) | |
56 | { | |
eb160463 | 57 | if (SvIV(subgen) == (IV)PL_sub_generation) { |
46e4b22b GS |
58 | SV* sv; |
59 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); | |
60 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) { | |
61 | DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n", | |
62 | name, HvNAME(stash)) ); | |
63 | return sv; | |
64 | } | |
65 | } | |
66 | else { | |
67 | DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n", | |
68 | HvNAME(stash)) ); | |
69 | hv_clear(hv); | |
70 | sv_setiv(subgen, PL_sub_generation); | |
71 | } | |
6d4a7be2 | 72 | } |
73 | ||
74 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); | |
46e4b22b | 75 | |
3280af22 | 76 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
46e4b22b | 77 | if (!hv || !subgen) { |
6d4a7be2 | 78 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); |
79 | ||
80 | gv = *gvp; | |
81 | ||
82 | if (SvTYPE(gv) != SVt_PVGV) | |
83 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); | |
84 | ||
46e4b22b GS |
85 | if (!hv) |
86 | hv = GvHVn(gv); | |
87 | if (!subgen) { | |
88 | subgen = newSViv(PL_sub_generation); | |
89 | GvSV(gv) = subgen; | |
90 | } | |
6d4a7be2 | 91 | } |
46e4b22b | 92 | if (hv) { |
6d4a7be2 | 93 | SV** svp = AvARRAY(av); |
93965878 NIS |
94 | /* NOTE: No support for tied ISA */ |
95 | I32 items = AvFILLp(av) + 1; | |
6d4a7be2 | 96 | while (items--) { |
97 | SV* sv = *svp++; | |
98 | HV* basestash = gv_stashsv(sv, FALSE); | |
99 | if (!basestash) { | |
599cee73 | 100 | if (ckWARN(WARN_MISC)) |
9014280d | 101 | Perl_warner(aTHX_ packWARN(WARN_SYNTAX), |
c293eb2b NC |
102 | "Can't locate package %"SVf" for @%s::ISA", |
103 | sv, HvNAME(stash)); | |
6d4a7be2 | 104 | continue; |
105 | } | |
301daebc MS |
106 | if (&PL_sv_yes == isa_lookup(basestash, name, name_stash, |
107 | len, level + 1)) { | |
3280af22 NIS |
108 | (void)hv_store(hv,name,len,&PL_sv_yes,0); |
109 | return &PL_sv_yes; | |
6d4a7be2 | 110 | } |
111 | } | |
3280af22 | 112 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
6d4a7be2 | 113 | } |
114 | } | |
115 | ||
e09f3e01 | 116 | return boolSV(strEQ(name, "UNIVERSAL")); |
6d4a7be2 | 117 | } |
118 | ||
954c1994 | 119 | /* |
ccfc67b7 JH |
120 | =head1 SV Manipulation Functions |
121 | ||
954c1994 GS |
122 | =for apidoc sv_derived_from |
123 | ||
124 | Returns a boolean indicating whether the SV is derived from the specified | |
125 | class. This is the function that implements C<UNIVERSAL::isa>. It works | |
126 | for class names as well as for objects. | |
127 | ||
128 | =cut | |
129 | */ | |
130 | ||
55497cff | 131 | bool |
864dbfa3 | 132 | Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
55497cff | 133 | { |
55497cff | 134 | char *type; |
135 | HV *stash; | |
301daebc | 136 | HV *name_stash; |
46e4b22b | 137 | |
55497cff | 138 | stash = Nullhv; |
139 | type = Nullch; | |
46e4b22b | 140 | |
55497cff | 141 | if (SvGMAGICAL(sv)) |
142 | mg_get(sv) ; | |
143 | ||
144 | if (SvROK(sv)) { | |
145 | sv = SvRV(sv); | |
146 | type = sv_reftype(sv,0); | |
46e4b22b | 147 | if (SvOBJECT(sv)) |
55497cff | 148 | stash = SvSTASH(sv); |
149 | } | |
150 | else { | |
151 | stash = gv_stashsv(sv, FALSE); | |
152 | } | |
46e4b22b | 153 | |
301daebc MS |
154 | name_stash = gv_stashpv(name, FALSE); |
155 | ||
55497cff | 156 | return (type && strEQ(type,name)) || |
301daebc MS |
157 | (stash && isa_lookup(stash, name, name_stash, strlen(name), 0) |
158 | == &PL_sv_yes) | |
55497cff | 159 | ? TRUE |
160 | : FALSE ; | |
55497cff | 161 | } |
162 | ||
1b026014 NIS |
163 | #include "XSUB.h" |
164 | ||
acfe0abc GS |
165 | void XS_UNIVERSAL_isa(pTHX_ CV *cv); |
166 | void XS_UNIVERSAL_can(pTHX_ CV *cv); | |
167 | void XS_UNIVERSAL_VERSION(pTHX_ CV *cv); | |
18729d3e | 168 | XS(XS_utf8_is_utf8); |
1b026014 NIS |
169 | XS(XS_utf8_valid); |
170 | XS(XS_utf8_encode); | |
171 | XS(XS_utf8_decode); | |
172 | XS(XS_utf8_upgrade); | |
173 | XS(XS_utf8_downgrade); | |
174 | XS(XS_utf8_unicode_to_native); | |
175 | XS(XS_utf8_native_to_unicode); | |
29569577 JH |
176 | XS(XS_Internals_SvREADONLY); |
177 | XS(XS_Internals_SvREFCNT); | |
f044d0d1 | 178 | XS(XS_Internals_hv_clear_placehold); |
5095c3e6 | 179 | XS(XS_PerlIO_get_layers); |
0cb96387 GS |
180 | |
181 | void | |
182 | Perl_boot_core_UNIVERSAL(pTHX) | |
183 | { | |
184 | char *file = __FILE__; | |
185 | ||
186 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); | |
187 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); | |
188 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); | |
18729d3e | 189 | newXS("utf8::is_utf8", XS_utf8_is_utf8, file); |
1b026014 NIS |
190 | newXS("utf8::valid", XS_utf8_valid, file); |
191 | newXS("utf8::encode", XS_utf8_encode, file); | |
192 | newXS("utf8::decode", XS_utf8_decode, file); | |
193 | newXS("utf8::upgrade", XS_utf8_upgrade, file); | |
194 | newXS("utf8::downgrade", XS_utf8_downgrade, file); | |
195 | newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file); | |
196 | newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file); | |
29569577 JH |
197 | newXSproto("Internals::SvREADONLY",XS_Internals_SvREADONLY, file, "\\[$%@];$"); |
198 | newXSproto("Internals::SvREFCNT",XS_Internals_SvREFCNT, file, "\\[$%@];$"); | |
dfd4ef2f | 199 | newXSproto("Internals::hv_clear_placeholders", |
f044d0d1 | 200 | XS_Internals_hv_clear_placehold, file, "\\%"); |
e0dae7fe JH |
201 | newXSproto("PerlIO::get_layers", |
202 | XS_PerlIO_get_layers, file, "*;@"); | |
0cb96387 GS |
203 | } |
204 | ||
55497cff | 205 | |
6d4a7be2 | 206 | XS(XS_UNIVERSAL_isa) |
207 | { | |
208 | dXSARGS; | |
55497cff | 209 | SV *sv; |
210 | char *name; | |
2d8e6c8d | 211 | STRLEN n_a; |
6d4a7be2 | 212 | |
213 | if (items != 2) | |
cea2e8a9 | 214 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
6d4a7be2 | 215 | |
216 | sv = ST(0); | |
f8f70380 | 217 | |
d3f7f2b2 GS |
218 | if (SvGMAGICAL(sv)) |
219 | mg_get(sv); | |
220 | ||
6563884d JH |
221 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)) |
222 | || (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv)))) | |
f8f70380 GS |
223 | XSRETURN_UNDEF; |
224 | ||
2d8e6c8d | 225 | name = (char *)SvPV(ST(1),n_a); |
6d4a7be2 | 226 | |
54310121 | 227 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 | 228 | XSRETURN(1); |
229 | } | |
230 | ||
6d4a7be2 | 231 | XS(XS_UNIVERSAL_can) |
232 | { | |
233 | dXSARGS; | |
234 | SV *sv; | |
235 | char *name; | |
236 | SV *rv; | |
6f08146e | 237 | HV *pkg = NULL; |
2d8e6c8d | 238 | STRLEN n_a; |
6d4a7be2 | 239 | |
240 | if (items != 2) | |
cea2e8a9 | 241 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
6d4a7be2 | 242 | |
243 | sv = ST(0); | |
f8f70380 | 244 | |
d3f7f2b2 GS |
245 | if (SvGMAGICAL(sv)) |
246 | mg_get(sv); | |
247 | ||
6563884d JH |
248 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)) |
249 | || (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv)))) | |
f8f70380 GS |
250 | XSRETURN_UNDEF; |
251 | ||
2d8e6c8d | 252 | name = (char *)SvPV(ST(1),n_a); |
3280af22 | 253 | rv = &PL_sv_undef; |
6d4a7be2 | 254 | |
46e4b22b | 255 | if (SvROK(sv)) { |
6f08146e | 256 | sv = (SV*)SvRV(sv); |
46e4b22b | 257 | if (SvOBJECT(sv)) |
6f08146e NIS |
258 | pkg = SvSTASH(sv); |
259 | } | |
260 | else { | |
261 | pkg = gv_stashsv(sv, FALSE); | |
262 | } | |
263 | ||
264 | if (pkg) { | |
dc848c6f | 265 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
266 | if (gv && isGV(gv)) | |
267 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); | |
6d4a7be2 | 268 | } |
269 | ||
270 | ST(0) = rv; | |
271 | XSRETURN(1); | |
272 | } | |
273 | ||
6d4a7be2 | 274 | XS(XS_UNIVERSAL_VERSION) |
275 | { | |
276 | dXSARGS; | |
277 | HV *pkg; | |
278 | GV **gvp; | |
279 | GV *gv; | |
280 | SV *sv; | |
281 | char *undef; | |
282 | ||
1571675a | 283 | if (SvROK(ST(0))) { |
6d4a7be2 | 284 | sv = (SV*)SvRV(ST(0)); |
1571675a | 285 | if (!SvOBJECT(sv)) |
cea2e8a9 | 286 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
6d4a7be2 | 287 | pkg = SvSTASH(sv); |
288 | } | |
289 | else { | |
290 | pkg = gv_stashsv(ST(0), FALSE); | |
291 | } | |
292 | ||
293 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); | |
294 | ||
d4bea2fb | 295 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
6d4a7be2 | 296 | SV *nsv = sv_newmortal(); |
297 | sv_setsv(nsv, sv); | |
298 | sv = nsv; | |
299 | undef = Nullch; | |
300 | } | |
301 | else { | |
3280af22 | 302 | sv = (SV*)&PL_sv_undef; |
6d4a7be2 | 303 | undef = "(undef)"; |
304 | } | |
305 | ||
1571675a GS |
306 | if (items > 1) { |
307 | STRLEN len; | |
308 | SV *req = ST(1); | |
309 | ||
62658f4d PM |
310 | if (undef) { |
311 | if (pkg) | |
312 | Perl_croak(aTHX_ | |
313 | "%s does not define $%s::VERSION--version check failed", | |
314 | HvNAME(pkg), HvNAME(pkg)); | |
315 | else { | |
316 | char *str = SvPVx(ST(0), len); | |
317 | ||
318 | Perl_croak(aTHX_ | |
319 | "%s defines neither package nor VERSION--version check failed", str); | |
320 | } | |
321 | } | |
1571675a GS |
322 | if (!SvNIOK(sv) && SvPOK(sv)) { |
323 | char *str = SvPVx(sv,len); | |
324 | while (len) { | |
325 | --len; | |
326 | /* XXX could DWIM "1.2.3" here */ | |
327 | if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') | |
328 | break; | |
329 | } | |
330 | if (len) { | |
4305d8ab | 331 | if (SvNOK(req) && SvPOK(req)) { |
1571675a GS |
332 | /* they said C<use Foo v1.2.3> and $Foo::VERSION |
333 | * doesn't look like a float: do string compare */ | |
334 | if (sv_cmp(req,sv) == 1) { | |
d2560b70 RB |
335 | Perl_croak(aTHX_ "%s v%"VDf" required--" |
336 | "this is only v%"VDf, | |
1571675a GS |
337 | HvNAME(pkg), req, sv); |
338 | } | |
339 | goto finish; | |
340 | } | |
341 | /* they said C<use Foo 1.002_003> and $Foo::VERSION | |
342 | * doesn't look like a float: force numeric compare */ | |
155aba94 | 343 | (void)SvUPGRADE(sv, SVt_PVNV); |
1571675a GS |
344 | SvNVX(sv) = str_to_version(sv); |
345 | SvPOK_off(sv); | |
346 | SvNOK_on(sv); | |
347 | } | |
348 | } | |
349 | /* if we get here, we're looking for a numeric comparison, | |
350 | * so force the required version into a float, even if they | |
351 | * said C<use Foo v1.2.3> */ | |
4305d8ab | 352 | if (SvNOK(req) && SvPOK(req)) { |
1571675a GS |
353 | NV n = SvNV(req); |
354 | req = sv_newmortal(); | |
355 | sv_setnv(req, n); | |
356 | } | |
357 | ||
f6eb1a96 | 358 | if (SvNV(req) > SvNV(sv)) |
1571675a | 359 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
f6eb1a96 | 360 | HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv)); |
2d8e6c8d | 361 | } |
6d4a7be2 | 362 | |
1571675a | 363 | finish: |
6d4a7be2 | 364 | ST(0) = sv; |
365 | ||
366 | XSRETURN(1); | |
367 | } | |
368 | ||
18729d3e JH |
369 | XS(XS_utf8_is_utf8) |
370 | { | |
371 | dXSARGS; | |
372 | if (items != 1) | |
373 | Perl_croak(aTHX_ "Usage: utf8::is_utf8(sv)"); | |
374 | { | |
375 | SV * sv = ST(0); | |
376 | { | |
377 | if (SvUTF8(sv)) | |
378 | XSRETURN_YES; | |
379 | else | |
380 | XSRETURN_NO; | |
381 | } | |
382 | } | |
383 | XSRETURN_EMPTY; | |
384 | } | |
385 | ||
1b026014 NIS |
386 | XS(XS_utf8_valid) |
387 | { | |
18729d3e JH |
388 | dXSARGS; |
389 | if (items != 1) | |
390 | Perl_croak(aTHX_ "Usage: utf8::valid(sv)"); | |
391 | { | |
392 | SV * sv = ST(0); | |
393 | { | |
394 | STRLEN len; | |
395 | char *s = SvPV(sv,len); | |
396 | if (!SvUTF8(sv) || is_utf8_string((U8*)s,len)) | |
397 | XSRETURN_YES; | |
398 | else | |
399 | XSRETURN_NO; | |
400 | } | |
401 | } | |
402 | XSRETURN_EMPTY; | |
1b026014 NIS |
403 | } |
404 | ||
405 | XS(XS_utf8_encode) | |
406 | { | |
407 | dXSARGS; | |
408 | if (items != 1) | |
409 | Perl_croak(aTHX_ "Usage: utf8::encode(sv)"); | |
410 | { | |
411 | SV * sv = ST(0); | |
412 | ||
413 | sv_utf8_encode(sv); | |
414 | } | |
415 | XSRETURN_EMPTY; | |
416 | } | |
417 | ||
418 | XS(XS_utf8_decode) | |
419 | { | |
420 | dXSARGS; | |
421 | if (items != 1) | |
422 | Perl_croak(aTHX_ "Usage: utf8::decode(sv)"); | |
423 | { | |
424 | SV * sv = ST(0); | |
425 | bool RETVAL; | |
426 | ||
427 | RETVAL = sv_utf8_decode(sv); | |
428 | ST(0) = boolSV(RETVAL); | |
429 | sv_2mortal(ST(0)); | |
430 | } | |
431 | XSRETURN(1); | |
432 | } | |
433 | ||
434 | XS(XS_utf8_upgrade) | |
435 | { | |
436 | dXSARGS; | |
437 | if (items != 1) | |
438 | Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)"); | |
439 | { | |
440 | SV * sv = ST(0); | |
441 | STRLEN RETVAL; | |
442 | dXSTARG; | |
443 | ||
444 | RETVAL = sv_utf8_upgrade(sv); | |
445 | XSprePUSH; PUSHi((IV)RETVAL); | |
446 | } | |
447 | XSRETURN(1); | |
448 | } | |
449 | ||
450 | XS(XS_utf8_downgrade) | |
451 | { | |
452 | dXSARGS; | |
453 | if (items < 1 || items > 2) | |
454 | Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)"); | |
455 | { | |
456 | SV * sv = ST(0); | |
457 | bool failok; | |
458 | bool RETVAL; | |
459 | ||
460 | if (items < 2) | |
461 | failok = 0; | |
462 | else { | |
463 | failok = (int)SvIV(ST(1)); | |
464 | } | |
465 | ||
466 | RETVAL = sv_utf8_downgrade(sv, failok); | |
467 | ST(0) = boolSV(RETVAL); | |
468 | sv_2mortal(ST(0)); | |
469 | } | |
470 | XSRETURN(1); | |
471 | } | |
472 | ||
473 | XS(XS_utf8_native_to_unicode) | |
474 | { | |
475 | dXSARGS; | |
476 | UV uv = SvUV(ST(0)); | |
b7953727 JH |
477 | |
478 | if (items > 1) | |
479 | Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)"); | |
480 | ||
1b026014 NIS |
481 | ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv))); |
482 | XSRETURN(1); | |
483 | } | |
484 | ||
485 | XS(XS_utf8_unicode_to_native) | |
486 | { | |
487 | dXSARGS; | |
488 | UV uv = SvUV(ST(0)); | |
b7953727 JH |
489 | |
490 | if (items > 1) | |
491 | Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)"); | |
492 | ||
1b026014 NIS |
493 | ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv))); |
494 | XSRETURN(1); | |
495 | } | |
496 | ||
14a976d6 | 497 | XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */ |
29569577 JH |
498 | { |
499 | dXSARGS; | |
500 | SV *sv = SvRV(ST(0)); | |
501 | if (items == 1) { | |
502 | if (SvREADONLY(sv)) | |
503 | XSRETURN_YES; | |
504 | else | |
505 | XSRETURN_NO; | |
506 | } | |
507 | else if (items == 2) { | |
508 | if (SvTRUE(ST(1))) { | |
509 | SvREADONLY_on(sv); | |
510 | XSRETURN_YES; | |
511 | } | |
512 | else { | |
14a976d6 | 513 | /* I hope you really know what you are doing. */ |
29569577 JH |
514 | SvREADONLY_off(sv); |
515 | XSRETURN_NO; | |
516 | } | |
517 | } | |
14a976d6 | 518 | XSRETURN_UNDEF; /* Can't happen. */ |
29569577 JH |
519 | } |
520 | ||
14a976d6 | 521 | XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */ |
29569577 JH |
522 | { |
523 | dXSARGS; | |
524 | SV *sv = SvRV(ST(0)); | |
525 | if (items == 1) | |
14a976d6 | 526 | XSRETURN_IV(SvREFCNT(sv) - 1); /* Minus the ref created for us. */ |
29569577 | 527 | else if (items == 2) { |
14a976d6 | 528 | /* I hope you really know what you are doing. */ |
29569577 JH |
529 | SvREFCNT(sv) = SvIV(ST(1)); |
530 | XSRETURN_IV(SvREFCNT(sv)); | |
531 | } | |
14a976d6 | 532 | XSRETURN_UNDEF; /* Can't happen. */ |
29569577 JH |
533 | } |
534 | ||
dfd4ef2f NC |
535 | /* Maybe this should return the number of placeholders found in scalar context, |
536 | and a list of them in list context. */ | |
f044d0d1 | 537 | XS(XS_Internals_hv_clear_placehold) |
dfd4ef2f NC |
538 | { |
539 | dXSARGS; | |
540 | HV *hv = (HV *) SvRV(ST(0)); | |
541 | ||
542 | /* I don't care how many parameters were passed in, but I want to avoid | |
543 | the unused variable warning. */ | |
544 | ||
eb160463 | 545 | items = (I32)HvPLACEHOLDERS(hv); |
dfd4ef2f NC |
546 | |
547 | if (items) { | |
548 | HE *entry; | |
549 | I32 riter = HvRITER(hv); | |
550 | HE *eiter = HvEITER(hv); | |
551 | hv_iterinit(hv); | |
fe7bca90 NC |
552 | /* This may look suboptimal with the items *after* the iternext, but |
553 | it's quite deliberate. We only get here with items==0 if we've | |
554 | just deleted the last placeholder in the hash. If we've just done | |
555 | that then it means that the hash is in lazy delete mode, and the | |
556 | HE is now only referenced in our iterator. If we just quit the loop | |
557 | and discarded our iterator then the HE leaks. So we do the && the | |
558 | other way to ensure iternext is called just one more time, which | |
559 | has the side effect of triggering the lazy delete. */ | |
560 | while ((entry = hv_iternext_flags(hv, HV_ITERNEXT_WANTPLACEHOLDERS)) | |
561 | && items) { | |
dfd4ef2f NC |
562 | SV *val = hv_iterval(hv, entry); |
563 | ||
564 | if (val == &PL_sv_undef) { | |
565 | ||
566 | /* It seems that I have to go back in the front of the hash | |
567 | API to delete a hash, even though I have a HE structure | |
568 | pointing to the very entry I want to delete, and could hold | |
569 | onto the previous HE that points to it. And it's easier to | |
570 | go in with SVs as I can then specify the precomputed hash, | |
571 | and don't have fun and games with utf8 keys. */ | |
572 | SV *key = hv_iterkeysv(entry); | |
573 | ||
574 | hv_delete_ent (hv, key, G_DISCARD, HeHASH(entry)); | |
575 | items--; | |
576 | } | |
577 | } | |
578 | HvRITER(hv) = riter; | |
579 | HvEITER(hv) = eiter; | |
580 | } | |
581 | ||
582 | XSRETURN(0); | |
583 | } | |
5095c3e6 JH |
584 | |
585 | XS(XS_PerlIO_get_layers) | |
586 | { | |
587 | dXSARGS; | |
588 | if (items < 1 || items % 2 == 0) | |
589 | Perl_croak(aTHX_ "Usage: PerlIO_get_layers(filehandle[,args])"); | |
e0dae7fe | 590 | #ifdef USE_PERLIO |
5095c3e6 JH |
591 | { |
592 | SV * sv; | |
593 | GV * gv; | |
594 | IO * io; | |
595 | bool input = TRUE; | |
596 | bool details = FALSE; | |
597 | ||
598 | if (items > 1) { | |
5095c3e6 JH |
599 | SV **svp; |
600 | ||
601 | for (svp = MARK + 2; svp <= SP; svp += 2) { | |
602 | SV **varp = svp; | |
603 | SV **valp = svp + 1; | |
604 | STRLEN klen; | |
605 | char *key = SvPV(*varp, klen); | |
606 | ||
607 | switch (*key) { | |
608 | case 'i': | |
609 | if (klen == 5 && memEQ(key, "input", 5)) { | |
610 | input = SvTRUE(*valp); | |
611 | break; | |
612 | } | |
613 | goto fail; | |
614 | case 'o': | |
615 | if (klen == 6 && memEQ(key, "output", 6)) { | |
616 | input = !SvTRUE(*valp); | |
617 | break; | |
618 | } | |
619 | goto fail; | |
620 | case 'd': | |
621 | if (klen == 7 && memEQ(key, "details", 7)) { | |
622 | details = SvTRUE(*valp); | |
623 | break; | |
624 | } | |
625 | goto fail; | |
626 | default: | |
627 | fail: | |
628 | Perl_croak(aTHX_ | |
629 | "get_layers: unknown argument '%s'", | |
630 | key); | |
631 | } | |
632 | } | |
633 | ||
634 | SP -= (items - 1); | |
635 | } | |
636 | ||
637 | sv = POPs; | |
638 | gv = (GV*)sv; | |
639 | ||
640 | if (!isGV(sv)) { | |
641 | if (SvROK(sv) && isGV(SvRV(sv))) | |
642 | gv = (GV*)SvRV(sv); | |
643 | else | |
644 | gv = gv_fetchpv(SvPVX(sv), FALSE, SVt_PVIO); | |
645 | } | |
646 | ||
647 | if (gv && (io = GvIO(gv))) { | |
648 | dTARGET; | |
649 | AV* av = PerlIO_get_layers(aTHX_ input ? | |
650 | IoIFP(io) : IoOFP(io)); | |
651 | I32 i; | |
652 | I32 last = av_len(av); | |
653 | I32 nitem = 0; | |
654 | ||
655 | for (i = last; i >= 0; i -= 3) { | |
656 | SV **namsvp; | |
657 | SV **argsvp; | |
658 | SV **flgsvp; | |
659 | bool namok, argok, flgok; | |
660 | ||
661 | namsvp = av_fetch(av, i - 2, FALSE); | |
662 | argsvp = av_fetch(av, i - 1, FALSE); | |
663 | flgsvp = av_fetch(av, i, FALSE); | |
664 | ||
665 | namok = namsvp && *namsvp && SvPOK(*namsvp); | |
666 | argok = argsvp && *argsvp && SvPOK(*argsvp); | |
667 | flgok = flgsvp && *flgsvp && SvIOK(*flgsvp); | |
668 | ||
669 | if (details) { | |
670 | XPUSHs(namok ? | |
671 | newSVpv(SvPVX(*namsvp), 0) : &PL_sv_undef); | |
672 | XPUSHs(argok ? | |
673 | newSVpv(SvPVX(*argsvp), 0) : &PL_sv_undef); | |
674 | if (flgok) | |
675 | XPUSHi(SvIVX(*flgsvp)); | |
676 | else | |
677 | XPUSHs(&PL_sv_undef); | |
678 | nitem += 3; | |
679 | } | |
680 | else { | |
681 | if (namok && argok) | |
682 | XPUSHs(Perl_newSVpvf(aTHX_ "%"SVf"(%"SVf")", | |
683 | *namsvp, *argsvp)); | |
684 | else if (namok) | |
685 | XPUSHs(Perl_newSVpvf(aTHX_ "%"SVf, *namsvp)); | |
686 | else | |
687 | XPUSHs(&PL_sv_undef); | |
688 | nitem++; | |
689 | if (flgok) { | |
690 | IV flags = SvIVX(*flgsvp); | |
691 | ||
692 | if (flags & PERLIO_F_UTF8) { | |
693 | XPUSHs(newSVpvn("utf8", 4)); | |
694 | nitem++; | |
695 | } | |
696 | } | |
697 | } | |
698 | } | |
699 | ||
700 | SvREFCNT_dec(av); | |
701 | ||
702 | XSRETURN(nitem); | |
703 | } | |
704 | } | |
e0dae7fe | 705 | #endif |
5095c3e6 JH |
706 | |
707 | XSRETURN(0); | |
708 | } | |
709 |