3 perlapi - autogenerated documentation for the perl public API
6 X<Perl API> X<API> X<api>
8 This file contains the documentation of the perl public API generated by
9 embed.pl, specifically a listing of functions, macros, flags, and variables
10 that may be used by extension writers. The interfaces of any functions that
11 are not listed here are subject to change without notice. For this reason,
12 blindly using functions listed in proto.h is to be avoided when writing
15 Note that all Perl API global variables must be referenced with the C<PL_>
16 prefix. Some macros are provided for compatibility with the older,
17 unadorned names, but this support may be disabled in a future release.
19 The listing is alphabetical, case insensitive.
29 A backward-compatible version of C<GIMME_V> which can only return
30 C<G_SCALAR> or C<G_ARRAY>; in a void context, it returns C<G_SCALAR>.
31 Deprecated. Use C<GIMME_V> instead.
41 The XSUB-writer's equivalent to Perl's C<wantarray>. Returns C<G_VOID>,
42 C<G_SCALAR> or C<G_ARRAY> for void, scalar or list context,
53 Used to indicate list context. See C<GIMME_V>, C<GIMME> and
62 Indicates that arguments returned from a callback should be discarded. See
71 Used to force a Perl C<eval> wrapper around a callback. See
80 Indicates that no arguments are being sent to a callback. See
89 Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and
98 Used to indicate void context. See C<GIMME_V> and L<perlcall>.
106 =head1 Array Manipulation Functions
113 Same as C<av_len()>. Deprecated, use C<av_len()> instead.
123 Clears an array, making it empty. Does not free the memory used by the
126 void av_clear(AV* ar)
134 Deletes the element indexed by C<key> from the array. Returns the
135 deleted element. If C<flags> equals C<G_DISCARD>, the element is freed
136 and null is returned.
138 SV* av_delete(AV* ar, I32 key, I32 flags)
146 Returns true if the element indexed by C<key> has been initialized.
148 This relies on the fact that uninitialized array elements are set to
151 bool av_exists(AV* ar, I32 key)
159 Pre-extend an array. The C<key> is the index to which the array should be
162 void av_extend(AV* ar, I32 key)
170 Returns the SV at the specified index in the array. The C<key> is the
171 index. If C<lval> is set then the fetch will be part of a store. Check
172 that the return value is non-null before dereferencing it to a C<SV*>.
174 See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for
175 more information on how to use this function on tied arrays.
177 SV** av_fetch(AV* ar, I32 key, I32 lval)
185 Ensure than an array has a given number of elements, equivalent to
186 Perl's C<$#array = $fill;>.
188 void av_fill(AV* ar, I32 fill)
196 Returns the highest index in the array. Returns -1 if the array is
199 I32 av_len(const AV* ar)
207 Creates a new AV and populates it with a list of SVs. The SVs are copied
208 into the array, so they may be freed after the call to av_make. The new AV
209 will have a reference count of 1.
211 AV* av_make(I32 size, SV** svp)
219 Pops an SV off the end of the array. Returns C<&PL_sv_undef> if the array
230 Pushes an SV onto the end of the array. The array will grow automatically
231 to accommodate the addition.
233 void av_push(AV* ar, SV* val)
241 Shifts an SV off the beginning of the array.
251 Stores an SV in an array. The array index is specified as C<key>. The
252 return value will be NULL if the operation failed or if the value did not
253 need to be actually stored within the array (as in the case of tied
254 arrays). Otherwise it can be dereferenced to get the original C<SV*>. Note
255 that the caller is responsible for suitably incrementing the reference
256 count of C<val> before the call, and decrementing it if the function
259 See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for
260 more information on how to use this function on tied arrays.
262 SV** av_store(AV* ar, I32 key, SV* val)
270 Undefines the array. Frees the memory used by the array itself.
272 void av_undef(AV* ar)
280 Unshift the given number of C<undef> values onto the beginning of the
281 array. The array will grow automatically to accommodate the addition. You
282 must then use C<av_store> to assign values to these new elements.
284 void av_unshift(AV* ar, I32 num)
292 Returns the AV of the specified Perl array. If C<create> is set and the
293 Perl variable does not exist then it will be created. If C<create> is not
294 set and the variable does not exist then NULL is returned.
296 NOTE: the perl_ form of this function is deprecated.
298 AV* get_av(const char* name, I32 create)
306 Creates a new AV. The reference count is set to 1.
316 Sort an array. Here is an example:
318 sortsv(AvARRAY(av), av_len(av)+1, Perl_sv_cmp_locale);
320 Currently this always uses mergesort. See sortsv_flags for a more
323 void sortsv(SV** array, size_t num_elts, SVCOMPARE_t cmp)
326 Found in file pp_sort.c
331 Sort an array, with various options.
333 void sortsv_flags(SV** array, size_t num_elts, SVCOMPARE_t cmp, U32 flags)
336 Found in file pp_sort.c
341 =head1 Callback Functions
348 Performs a callback to the specified Perl sub. See L<perlcall>.
350 NOTE: the perl_ form of this function is deprecated.
352 I32 call_argv(const char* sub_name, I32 flags, char** argv)
360 Performs a callback to the specified Perl method. The blessed object must
361 be on the stack. See L<perlcall>.
363 NOTE: the perl_ form of this function is deprecated.
365 I32 call_method(const char* methname, I32 flags)
373 Performs a callback to the specified Perl sub. See L<perlcall>.
375 NOTE: the perl_ form of this function is deprecated.
377 I32 call_pv(const char* sub_name, I32 flags)
385 Performs a callback to the Perl sub whose name is in the SV. See
388 NOTE: the perl_ form of this function is deprecated.
390 I32 call_sv(SV* sv, I32 flags)
398 Opening bracket on a callback. See C<LEAVE> and L<perlcall>.
403 Found in file scope.h
408 Tells Perl to C<eval> the given string and return an SV* result.
410 NOTE: the perl_ form of this function is deprecated.
412 SV* eval_pv(const char* p, I32 croak_on_error)
420 Tells Perl to C<eval> the string in the SV.
422 NOTE: the perl_ form of this function is deprecated.
424 I32 eval_sv(SV* sv, I32 flags)
432 Closing bracket for temporaries on a callback. See C<SAVETMPS> and
438 Found in file scope.h
443 Closing bracket on a callback. See C<ENTER> and L<perlcall>.
448 Found in file scope.h
453 Opening bracket for temporaries on a callback. See C<FREETMPS> and
459 Found in file scope.h
464 =head1 Character classes
471 Returns a boolean indicating whether the C C<char> is an ASCII alphanumeric
472 character (including underscore) or digit.
474 bool isALNUM(char ch)
477 Found in file handy.h
482 Returns a boolean indicating whether the C C<char> is an ASCII alphabetic
485 bool isALPHA(char ch)
488 Found in file handy.h
493 Returns a boolean indicating whether the C C<char> is an ASCII
496 bool isDIGIT(char ch)
499 Found in file handy.h
504 Returns a boolean indicating whether the C C<char> is a lowercase
507 bool isLOWER(char ch)
510 Found in file handy.h
515 Returns a boolean indicating whether the C C<char> is whitespace.
517 bool isSPACE(char ch)
520 Found in file handy.h
525 Returns a boolean indicating whether the C C<char> is an uppercase
528 bool isUPPER(char ch)
531 Found in file handy.h
536 Converts the specified character to lowercase.
538 char toLOWER(char ch)
541 Found in file handy.h
546 Converts the specified character to uppercase.
548 char toUPPER(char ch)
551 Found in file handy.h
556 =head1 Cloning an interpreter
563 Create and return a new interpreter by cloning the current one.
565 perl_clone takes these flags as parameters:
567 CLONEf_COPY_STACKS - is used to, well, copy the stacks also,
568 without it we only clone the data and zero the stacks,
569 with it we copy the stacks and the new perl interpreter is
570 ready to run at the exact same point as the previous one.
571 The pseudo-fork code uses COPY_STACKS while the
572 threads->new doesn't.
574 CLONEf_KEEP_PTR_TABLE
575 perl_clone keeps a ptr_table with the pointer of the old
576 variable as a key and the new variable as a value,
577 this allows it to check if something has been cloned and not
578 clone it again but rather just use the value and increase the
579 refcount. If KEEP_PTR_TABLE is not set then perl_clone will kill
580 the ptr_table using the function
581 C<ptr_table_free(PL_ptr_table); PL_ptr_table = NULL;>,
582 reason to keep it around is if you want to dup some of your own
583 variable who are outside the graph perl scans, example of this
584 code is in threads.xs create
587 This is a win32 thing, it is ignored on unix, it tells perls
588 win32host code (which is c++) to clone itself, this is needed on
589 win32 if you want to run two threads at the same time,
590 if you just want to do some stuff in a separate perl interpreter
591 and then throw it away and return to the original one,
592 you don't need to do anything.
594 PerlInterpreter* perl_clone(PerlInterpreter* interp, UV flags)
602 =head1 CV Manipulation Functions
609 Returns the stash of the CV.
619 Returns the CV of the specified Perl subroutine. If C<create> is set and
620 the Perl subroutine does not exist then it will be declared (which has the
621 same effect as saying C<sub name;>). If C<create> is not set and the
622 subroutine does not exist then NULL is returned.
624 NOTE: the perl_ form of this function is deprecated.
626 CV* get_cv(const char* name, I32 create)
634 =head1 Embedding Functions
641 Clear out all the active components of a CV. This can happen either
642 by an explicit C<undef &foo>, or by the reference count going to zero.
643 In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
644 children can still follow the full lexical scope chain.
646 void cv_undef(CV* cv)
654 Loads the module whose name is pointed to by the string part of name.
655 Note that the actual module name, not its filename, should be given.
656 Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of
657 PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOADMOD_IMPORT_OPS
658 (or 0 for no flags). ver, if specified, provides version semantics
659 similar to C<use Foo::Bar VERSION>. The optional trailing SV*
660 arguments can be used to specify arguments to the module's import()
661 method, similar to C<use Foo::Bar VERSION LIST>.
663 void load_module(U32 flags, SV* name, SV* ver, ...)
671 Stub that provides thread hook for perl_destruct when there are
682 Allocates a new Perl interpreter. See L<perlembed>.
684 PerlInterpreter* perl_alloc()
692 Initializes a new Perl interpreter. See L<perlembed>.
694 void perl_construct(PerlInterpreter* interp)
702 Shuts down a Perl interpreter. See L<perlembed>.
704 int perl_destruct(PerlInterpreter* interp)
712 Releases a Perl interpreter. See L<perlembed>.
714 void perl_free(PerlInterpreter* interp)
722 Tells a Perl interpreter to parse a Perl script. See L<perlembed>.
724 int perl_parse(PerlInterpreter* interp, XSINIT_t xsinit, int argc, char** argv, char** env)
732 Tells a Perl interpreter to run. See L<perlembed>.
734 int perl_run(PerlInterpreter* interp)
742 Tells Perl to C<require> the file named by the string argument. It is
743 analogous to the Perl code C<eval "require '$file'">. It's even
744 implemented that way; consider using load_module instead.
746 NOTE: the perl_ form of this function is deprecated.
748 void require_pv(const char* pv)
756 =head1 Functions in file mathoms.c
764 See L<gv_fetchmethod_autoload>.
766 GV* gv_fetchmethod(HV* stash, const char* name)
769 Found in file mathoms.c
771 =item sv_2pvbyte_nolen
774 Return a pointer to the byte-encoded representation of the SV.
775 May cause the SV to be downgraded from UTF-8 as a side-effect.
777 Usually accessed via the C<SvPVbyte_nolen> macro.
779 char* sv_2pvbyte_nolen(SV* sv)
782 Found in file mathoms.c
784 =item sv_2pvutf8_nolen
787 Return a pointer to the UTF-8-encoded representation of the SV.
788 May cause the SV to be upgraded to UTF-8 as a side-effect.
790 Usually accessed via the C<SvPVutf8_nolen> macro.
792 char* sv_2pvutf8_nolen(SV* sv)
795 Found in file mathoms.c
800 Like C<sv_2pv()>, but doesn't return the length too. You should usually
801 use the macro wrapper C<SvPV_nolen(sv)> instead.
802 char* sv_2pv_nolen(SV* sv)
805 Found in file mathoms.c
810 Like C<sv_catpvn>, but also handles 'set' magic.
812 void sv_catpvn_mg(SV *sv, const char *ptr, STRLEN len)
815 Found in file mathoms.c
820 Like C<sv_catsv>, but also handles 'set' magic.
822 void sv_catsv_mg(SV *dstr, SV *sstr)
825 Found in file mathoms.c
827 =item sv_force_normal
830 Undo various types of fakery on an SV: if the PV is a shared string, make
831 a private copy; if we're a ref, stop refing; if we're a glob, downgrade to
832 an xpvmg. See also C<sv_force_normal_flags>.
834 void sv_force_normal(SV *sv)
837 Found in file mathoms.c
842 A private implementation of the C<SvIVx> macro for compilers which can't
843 cope with complex macro expressions. Always use the macro instead.
848 Found in file mathoms.c
853 Dummy routine which "locks" an SV when there is no locking module present.
854 Exists to avoid test for a NULL function pointer and because it could
855 potentially warn under some level of strict-ness.
857 "Superseded" by sv_nosharing().
859 void sv_nolocking(SV *sv)
862 Found in file mathoms.c
867 Dummy routine which "unlocks" an SV when there is no locking module present.
868 Exists to avoid test for a NULL function pointer and because it could
869 potentially warn under some level of strict-ness.
871 "Superseded" by sv_nosharing().
873 void sv_nounlocking(SV *sv)
876 Found in file mathoms.c
881 A private implementation of the C<SvNVx> macro for compilers which can't
882 cope with complex macro expressions. Always use the macro instead.
887 Found in file mathoms.c
892 Use the C<SvPV_nolen> macro instead
897 Found in file mathoms.c
902 Use C<SvPVbyte_nolen> instead.
904 char* sv_pvbyte(SV *sv)
907 Found in file mathoms.c
912 A private implementation of the C<SvPVbyte> macro for compilers
913 which can't cope with complex macro expressions. Always use the macro
916 char* sv_pvbyten(SV *sv, STRLEN *len)
919 Found in file mathoms.c
924 A private implementation of the C<SvPV> macro for compilers which can't
925 cope with complex macro expressions. Always use the macro instead.
927 char* sv_pvn(SV *sv, STRLEN *len)
930 Found in file mathoms.c
935 Use the C<SvPVutf8_nolen> macro instead
937 char* sv_pvutf8(SV *sv)
940 Found in file mathoms.c
945 A private implementation of the C<SvPVutf8> macro for compilers
946 which can't cope with complex macro expressions. Always use the macro
949 char* sv_pvutf8n(SV *sv, STRLEN *len)
952 Found in file mathoms.c
957 Taint an SV. Use C<SvTAINTED_on> instead.
958 void sv_taint(SV* sv)
961 Found in file mathoms.c
966 Unsets the RV status of the SV, and decrements the reference count of
967 whatever was being referenced by the RV. This can almost be thought of
968 as a reversal of C<newSVrv>. This is C<sv_unref_flags> with the C<flag>
969 being zero. See C<SvROK_off>.
971 void sv_unref(SV* sv)
974 Found in file mathoms.c
979 Tells an SV to use C<ptr> to find its string value. Implemented by
980 calling C<sv_usepvn_flags> with C<flags> of 0, hence does not handle 'set'
981 magic. See C<sv_usepvn_flags>.
983 void sv_usepvn(SV* sv, char* ptr, STRLEN len)
986 Found in file mathoms.c
991 Like C<sv_usepvn>, but also handles 'set' magic.
993 void sv_usepvn_mg(SV *sv, char *ptr, STRLEN len)
996 Found in file mathoms.c
1001 A private implementation of the C<SvUVx> macro for compilers which can't
1002 cope with complex macro expressions. Always use the macro instead.
1007 Found in file mathoms.c
1012 =head1 Functions in file pp_pack.c
1020 The engine implementing pack() Perl function.
1022 void packlist(SV *cat, const char *pat, const char *patend, SV **beglist, SV **endlist)
1025 Found in file pp_pack.c
1030 The engine implementing pack() Perl function. Note: parameters next_in_list and
1031 flags are not used. This call should not be used; use packlist instead.
1033 void pack_cat(SV *cat, const char *pat, const char *patend, SV **beglist, SV **endlist, SV ***next_in_list, U32 flags)
1036 Found in file pp_pack.c
1041 The engine implementing unpack() Perl function. C<unpackstring> puts the
1042 extracted list items on the stack and returns the number of elements.
1043 Issue C<PUTBACK> before and C<SPAGAIN> after the call to this function.
1045 I32 unpackstring(const char *pat, const char *patend, const char *s, const char *strend, U32 flags)
1048 Found in file pp_pack.c
1053 The engine implementing unpack() Perl function. Note: parameters strbeg, new_s
1054 and ocnt are not used. This call should not be used, use unpackstring instead.
1056 I32 unpack_str(const char *pat, const char *patend, const char *s, const char *strbeg, const char *strend, char **new_s, I32 ocnt, U32 flags)
1059 Found in file pp_pack.c
1064 =head1 Global Variables
1071 C<PL_modglobal> is a general purpose, interpreter global HV for use by
1072 extensions that need to keep information on a per-interpreter basis.
1073 In a pinch, it can also be used as a symbol table for extensions
1074 to share data among each other. It is a good idea to use keys
1075 prefixed by the package name of the extension that owns the data.
1080 Found in file intrpvar.h
1085 A convenience variable which is typically used with C<SvPV> when one
1086 doesn't care about the length of the string. It is usually more efficient
1087 to either declare a local variable and use that instead or to use the
1088 C<SvPV_nolen> macro.
1093 Found in file thrdvar.h
1098 This is the C<false> SV. See C<PL_sv_yes>. Always refer to this as
1104 Found in file intrpvar.h
1109 This is the C<undef> SV. Always refer to this as C<&PL_sv_undef>.
1114 Found in file intrpvar.h
1119 This is the C<true> SV. See C<PL_sv_no>. Always refer to this as
1125 Found in file intrpvar.h
1137 Return the SV from the GV.
1147 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
1148 inlining, or C<gv> is a placeholder reference that would be promoted to such
1149 a typeglob, then returns the value returned by the sub. Otherwise, returns
1152 SV* gv_const_sv(GV* gv)
1160 Returns the glob with the given C<name> and a defined subroutine or
1161 C<NULL>. The glob lives in the given C<stash>, or in the stashes
1162 accessible via @ISA and UNIVERSAL::.
1164 The argument C<level> should be either 0 or -1. If C<level==0>, as a
1165 side-effect creates a glob with the given C<name> in the given C<stash>
1166 which in the case of success contains an alias for the subroutine, and sets
1167 up caching info for this glob. Similarly for all the searched stashes.
1169 This function grants C<"SUPER"> token as a postfix of the stash name. The
1170 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
1171 visible to Perl code. So when calling C<call_sv>, you should not use
1172 the GV directly; instead, you should use the method's CV, which can be
1173 obtained from the GV with the C<GvCV> macro.
1175 GV* gv_fetchmeth(HV* stash, const char* name, STRLEN len, I32 level)
1180 =item gv_fetchmethod_autoload
1181 X<gv_fetchmethod_autoload>
1183 Returns the glob which contains the subroutine to call to invoke the method
1184 on the C<stash>. In fact in the presence of autoloading this may be the
1185 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
1188 The third parameter of C<gv_fetchmethod_autoload> determines whether
1189 AUTOLOAD lookup is performed if the given method is not present: non-zero
1190 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
1191 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
1192 with a non-zero C<autoload> parameter.
1194 These functions grant C<"SUPER"> token as a prefix of the method name. Note
1195 that if you want to keep the returned glob for a long time, you need to
1196 check for it being "AUTOLOAD", since at the later time the call may load a
1197 different subroutine due to $AUTOLOAD changing its value. Use the glob
1198 created via a side effect to do this.
1200 These functions have the same side-effects and as C<gv_fetchmeth> with
1201 C<level==0>. C<name> should be writable if contains C<':'> or C<'
1202 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
1203 C<call_sv> apply equally to these functions.
1205 GV* gv_fetchmethod_autoload(HV* stash, const char* name, I32 autoload)
1210 =item gv_fetchmeth_autoload
1211 X<gv_fetchmeth_autoload>
1213 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
1214 Returns a glob for the subroutine.
1216 For an autoloaded subroutine without a GV, will create a GV even
1217 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
1218 of the result may be zero.
1220 GV* gv_fetchmeth_autoload(HV* stash, const char* name, STRLEN len, I32 level)
1228 Returns a pointer to the stash for a specified package. C<name> should
1229 be a valid UTF-8 string and must be null-terminated. If C<create> is set
1230 then the package will be created if it does not already exist. If C<create>
1231 is not set and the package does not exist then NULL is returned.
1233 HV* gv_stashpv(const char* name, I32 create)
1241 Returns a pointer to the stash for a specified package. C<name> should
1242 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
1243 the C<name>, in bytes. If C<create> is set then the package will be
1244 created if it does not already exist. If C<create> is not set and the
1245 package does not exist then NULL is returned.
1247 HV* gv_stashpvn(const char* name, U32 namelen, I32 create)
1255 Returns a pointer to the stash for a specified package, which must be a
1256 valid UTF-8 string. See C<gv_stashpv>.
1258 HV* gv_stashsv(SV* sv, I32 create)
1281 Null character pointer.
1284 Found in file handy.h
1308 Found in file handy.h
1313 =head1 Hash Manipulation Functions
1320 Returns the HV of the specified Perl hash. If C<create> is set and the
1321 Perl variable does not exist then it will be created. If C<create> is not
1322 set and the variable does not exist then NULL is returned.
1324 NOTE: the perl_ form of this function is deprecated.
1326 HV* get_hv(const char* name, I32 create)
1329 Found in file perl.c
1334 This flag, used in the length slot of hash entries and magic structures,
1335 specifies the structure contains an C<SV*> pointer where a C<char*> pointer
1336 is to be expected. (For information only--not to be used).
1344 Returns the computed hash stored in the hash entry.
1354 Returns the actual pointer stored in the key slot of the hash entry. The
1355 pointer may be either C<char*> or C<SV*>, depending on the value of
1356 C<HeKLEN()>. Can be assigned to. The C<HePV()> or C<HeSVKEY()> macros are
1357 usually preferable for finding the value of a key.
1367 If this is negative, and amounts to C<HEf_SVKEY>, it indicates the entry
1368 holds an C<SV*> key. Otherwise, holds the actual length of the key. Can
1369 be assigned to. The C<HePV()> macro is usually preferable for finding key
1372 STRLEN HeKLEN(HE* he)
1380 Returns the key slot of the hash entry as a C<char*> value, doing any
1381 necessary dereferencing of possibly C<SV*> keys. The length of the string
1382 is placed in C<len> (this is a macro, so do I<not> use C<&len>). If you do
1383 not care about what the length of the key is, you may use the global
1384 variable C<PL_na>, though this is rather less efficient than using a local
1385 variable. Remember though, that hash keys in perl are free to contain
1386 embedded nulls, so using C<strlen()> or similar is not a good way to find
1387 the length of hash keys. This is very similar to the C<SvPV()> macro
1388 described elsewhere in this document.
1390 char* HePV(HE* he, STRLEN len)
1398 Returns the key as an C<SV*>, or C<NULL> if the hash entry does not
1399 contain an C<SV*> key.
1409 Returns the key as an C<SV*>. Will create and return a temporary mortal
1410 C<SV*> if the hash entry contains only a C<char*> key.
1412 SV* HeSVKEY_force(HE* he)
1420 Sets the key to a given C<SV*>, taking care to set the appropriate flags to
1421 indicate the presence of an C<SV*> key, and returns the same
1424 SV* HeSVKEY_set(HE* he, SV* sv)
1432 Returns the value slot (type C<SV*>) stored in the hash entry.
1442 Returns the package name of a stash, or NULL if C<stash> isn't a stash.
1443 See C<SvSTASH>, C<CvSTASH>.
1445 char* HvNAME(HV* stash)
1453 Check that a hash is in an internally consistent state.
1455 void hv_assert(HV* tb)
1463 Clears a hash, making it empty.
1465 void hv_clear(HV* tb)
1470 =item hv_clear_placeholders
1471 X<hv_clear_placeholders>
1473 Clears any placeholders from a hash. If a restricted hash has any of its keys
1474 marked as readonly and the key is subsequently deleted, the key is not actually
1475 deleted but is marked by assigning it a value of &PL_sv_placeholder. This tags
1476 it so it will be ignored by future operations such as iterating over the hash,
1477 but will still allow the hash to have a value reassigned to the key at some
1478 future point. This function clears any such placeholder keys from the hash.
1479 See Hash::Util::lock_keys() for an example of its use.
1481 void hv_clear_placeholders(HV* hb)
1489 Deletes a key/value pair in the hash. The value SV is removed from the
1490 hash and returned to the caller. The C<klen> is the length of the key.
1491 The C<flags> value will normally be zero; if set to G_DISCARD then NULL
1494 SV* hv_delete(HV* tb, const char* key, I32 klen, I32 flags)
1502 Deletes a key/value pair in the hash. The value SV is removed from the
1503 hash and returned to the caller. The C<flags> value will normally be zero;
1504 if set to G_DISCARD then NULL will be returned. C<hash> can be a valid
1505 precomputed hash value, or 0 to ask for it to be computed.
1507 SV* hv_delete_ent(HV* tb, SV* key, I32 flags, U32 hash)
1515 Returns a boolean indicating whether the specified hash key exists. The
1516 C<klen> is the length of the key.
1518 bool hv_exists(HV* tb, const char* key, I32 klen)
1526 Returns a boolean indicating whether the specified hash key exists. C<hash>
1527 can be a valid precomputed hash value, or 0 to ask for it to be
1530 bool hv_exists_ent(HV* tb, SV* key, U32 hash)
1538 Returns the SV which corresponds to the specified key in the hash. The
1539 C<klen> is the length of the key. If C<lval> is set then the fetch will be
1540 part of a store. Check that the return value is non-null before
1541 dereferencing it to an C<SV*>.
1543 See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
1544 information on how to use this function on tied hashes.
1546 SV** hv_fetch(HV* tb, const char* key, I32 klen, I32 lval)
1554 Returns the hash entry which corresponds to the specified key in the hash.
1555 C<hash> must be a valid precomputed hash number for the given C<key>, or 0
1556 if you want the function to compute it. IF C<lval> is set then the fetch
1557 will be part of a store. Make sure the return value is non-null before
1558 accessing it. The return value when C<tb> is a tied hash is a pointer to a
1559 static location, so be sure to make a copy of the structure if you need to
1562 See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
1563 information on how to use this function on tied hashes.
1565 HE* hv_fetch_ent(HV* tb, SV* key, I32 lval, U32 hash)
1573 Prepares a starting point to traverse a hash table. Returns the number of
1574 keys in the hash (i.e. the same as C<HvKEYS(tb)>). The return value is
1575 currently only meaningful for hashes without tie magic.
1577 NOTE: Before version 5.004_65, C<hv_iterinit> used to return the number of
1578 hash buckets that happen to be in use. If you still need that esoteric
1579 value, you can get it through the macro C<HvFILL(tb)>.
1582 I32 hv_iterinit(HV* tb)
1590 Returns the key from the current position of the hash iterator. See
1593 char* hv_iterkey(HE* entry, I32* retlen)
1601 Returns the key as an C<SV*> from the current position of the hash
1602 iterator. The return value will always be a mortal copy of the key. Also
1605 SV* hv_iterkeysv(HE* entry)
1613 Returns entries from a hash iterator. See C<hv_iterinit>.
1615 You may call C<hv_delete> or C<hv_delete_ent> on the hash entry that the
1616 iterator currently points to, without losing your place or invalidating your
1617 iterator. Note that in this case the current entry is deleted from the hash
1618 with your iterator holding the last reference to it. Your iterator is flagged
1619 to free the entry on the next call to C<hv_iternext>, so you must not discard
1620 your iterator immediately else the entry will leak - call C<hv_iternext> to
1621 trigger the resource deallocation.
1623 HE* hv_iternext(HV* tb)
1631 Performs an C<hv_iternext>, C<hv_iterkey>, and C<hv_iterval> in one
1634 SV* hv_iternextsv(HV* hv, char** key, I32* retlen)
1639 =item hv_iternext_flags
1640 X<hv_iternext_flags>
1642 Returns entries from a hash iterator. See C<hv_iterinit> and C<hv_iternext>.
1643 The C<flags> value will normally be zero; if HV_ITERNEXT_WANTPLACEHOLDERS is
1644 set the placeholders keys (for restricted hashes) will be returned in addition
1645 to normal keys. By default placeholders are automatically skipped over.
1646 Currently a placeholder is implemented with a value that is
1647 C<&Perl_sv_placeholder>. Note that the implementation of placeholders and
1648 restricted hashes may change, and the implementation currently is
1649 insufficiently abstracted for any change to be tidy.
1651 NOTE: this function is experimental and may change or be
1652 removed without notice.
1654 HE* hv_iternext_flags(HV* tb, I32 flags)
1662 Returns the value from the current position of the hash iterator. See
1665 SV* hv_iterval(HV* tb, HE* entry)
1673 Adds magic to a hash. See C<sv_magic>.
1675 void hv_magic(HV* hv, GV* gv, int how)
1683 Evaluates the hash in scalar context and returns the result. Handles magic when the hash is tied.
1685 SV* hv_scalar(HV* hv)
1693 Stores an SV in a hash. The hash key is specified as C<key> and C<klen> is
1694 the length of the key. The C<hash> parameter is the precomputed hash
1695 value; if it is zero then Perl will compute it. The return value will be
1696 NULL if the operation failed or if the value did not need to be actually
1697 stored within the hash (as in the case of tied hashes). Otherwise it can
1698 be dereferenced to get the original C<SV*>. Note that the caller is
1699 responsible for suitably incrementing the reference count of C<val> before
1700 the call, and decrementing it if the function returned NULL. Effectively
1701 a successful hv_store takes ownership of one reference to C<val>. This is
1702 usually what you want; a newly created SV has a reference count of one, so
1703 if all your code does is create SVs then store them in a hash, hv_store
1704 will own the only reference to the new SV, and your code doesn't need to do
1705 anything further to tidy up. hv_store is not implemented as a call to
1706 hv_store_ent, and does not create a temporary SV for the key, so if your
1707 key data is not already in SV form then use hv_store in preference to
1710 See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
1711 information on how to use this function on tied hashes.
1713 SV** hv_store(HV* tb, const char* key, I32 klen, SV* val, U32 hash)
1721 Stores C<val> in a hash. The hash key is specified as C<key>. The C<hash>
1722 parameter is the precomputed hash value; if it is zero then Perl will
1723 compute it. The return value is the new hash entry so created. It will be
1724 NULL if the operation failed or if the value did not need to be actually
1725 stored within the hash (as in the case of tied hashes). Otherwise the
1726 contents of the return value can be accessed using the C<He?> macros
1727 described here. Note that the caller is responsible for suitably
1728 incrementing the reference count of C<val> before the call, and
1729 decrementing it if the function returned NULL. Effectively a successful
1730 hv_store_ent takes ownership of one reference to C<val>. This is
1731 usually what you want; a newly created SV has a reference count of one, so
1732 if all your code does is create SVs then store them in a hash, hv_store
1733 will own the only reference to the new SV, and your code doesn't need to do
1734 anything further to tidy up. Note that hv_store_ent only reads the C<key>;
1735 unlike C<val> it does not take ownership of it, so maintaining the correct
1736 reference count on C<key> is entirely the caller's responsibility. hv_store
1737 is not implemented as a call to hv_store_ent, and does not create a temporary
1738 SV for the key, so if your key data is not already in SV form then use
1739 hv_store in preference to hv_store_ent.
1741 See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
1742 information on how to use this function on tied hashes.
1744 HE* hv_store_ent(HV* tb, SV* key, SV* val, U32 hash)
1754 void hv_undef(HV* tb)
1762 Creates a new HV. The reference count is set to 1.
1772 =head1 Magical Functions
1779 Clear something magical that the SV represents. See C<sv_magic>.
1781 int mg_clear(SV* sv)
1789 Copies the magic from one SV to another. See C<sv_magic>.
1791 int mg_copy(SV* sv, SV* nsv, const char* key, I32 klen)
1799 Finds the magic pointer for type matching the SV. See C<sv_magic>.
1801 MAGIC* mg_find(const SV* sv, int type)
1809 Free any magic storage used by the SV. See C<sv_magic>.
1819 Do magic after a value is retrieved from the SV. See C<sv_magic>.
1829 Report on the SV's length. See C<sv_magic>.
1831 U32 mg_length(SV* sv)
1839 Turns on the magical status of an SV. See C<sv_magic>.
1841 void mg_magical(SV* sv)
1849 Do magic after a value is assigned to the SV. See C<sv_magic>.
1859 Invokes C<mg_get> on an SV if it has 'get' magic. This macro evaluates its
1860 argument more than once.
1862 void SvGETMAGIC(SV* sv)
1870 Arranges for a mutual exclusion lock to be obtained on sv if a suitable module
1881 Invokes C<mg_set> on an SV if it has 'set' magic. This macro evaluates its
1882 argument more than once.
1884 void SvSETMAGIC(SV* sv)
1892 Like C<SvSetSV>, but does any set magic required afterwards.
1894 void SvSetMagicSV(SV* dsb, SV* ssv)
1899 =item SvSetMagicSV_nosteal
1900 X<SvSetMagicSV_nosteal>
1902 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
1904 void SvSetMagicSV_nosteal(SV* dsv, SV* ssv)
1912 Calls C<sv_setsv> if dsv is not the same as ssv. May evaluate arguments
1915 void SvSetSV(SV* dsb, SV* ssv)
1920 =item SvSetSV_nosteal
1923 Calls a non-destructive version of C<sv_setsv> if dsv is not the same as
1924 ssv. May evaluate arguments more than once.
1926 void SvSetSV_nosteal(SV* dsv, SV* ssv)
1934 Arranges for sv to be shared between threads if a suitable module
1937 void SvSHARE(SV* sv)
1945 Releases a mutual exclusion lock on sv if a suitable module
1948 void SvUNLOCK(SV* sv)
1956 =head1 Memory Management
1963 The XSUB-writer's interface to the C C<memcpy> function. The C<src> is the
1964 source, C<dest> is the destination, C<nitems> is the number of items, and C<type> is
1965 the type. May fail on overlapping copies. See also C<Move>.
1967 void Copy(void* src, void* dest, int nitems, type)
1970 Found in file handy.h
1975 Like C<Copy> but returns dest. Useful for encouraging compilers to tail-call
1978 void * CopyD(void* src, void* dest, int nitems, type)
1981 Found in file handy.h
1986 The XSUB-writer's interface to the C C<memmove> function. The C<src> is the
1987 source, C<dest> is the destination, C<nitems> is the number of items, and C<type> is
1988 the type. Can do overlapping moves. See also C<Copy>.
1990 void Move(void* src, void* dest, int nitems, type)
1993 Found in file handy.h
1998 Like C<Move> but returns dest. Useful for encouraging compilers to tail-call
2001 void * MoveD(void* src, void* dest, int nitems, type)
2004 Found in file handy.h
2009 The XSUB-writer's interface to the C C<malloc> function.
2011 In 5.9.3, Newx() and friends replace the older New() API, and drops
2012 the first parameter, I<x>, a debug aid which allowed callers to identify
2013 themselves. This aid has been superseded by a new build option,
2014 PERL_MEM_LOG (see L<perlhack/PERL_MEM_LOG>). The older API is still
2015 there for use in XS modules supporting older perls.
2017 void Newx(void* ptr, int nitems, type)
2020 Found in file handy.h
2025 The XSUB-writer's interface to the C C<malloc> function, with
2026 cast. See also C<Newx>.
2028 void Newxc(void* ptr, int nitems, type, cast)
2031 Found in file handy.h
2036 The XSUB-writer's interface to the C C<malloc> function. The allocated
2037 memory is zeroed with C<memzero>. See also C<Newx>.
2039 void Newxz(void* ptr, int nitems, type)
2042 Found in file handy.h
2047 PoisonWith(0xEF) for catching access to freed memory.
2049 void Poison(void* dest, int nitems, type)
2052 Found in file handy.h
2057 PoisonWith(0xAB) for catching access to allocated but uninitialized memory.
2059 void PoisonNew(void* dest, int nitems, type)
2062 Found in file handy.h
2067 Fill up memory with a byte pattern (a byte repeated over and over
2068 again) that hopefully catches attempts to access uninitialized memory.
2070 void PoisonWith(void* dest, int nitems, type, U8 byte)
2073 Found in file handy.h
2078 The XSUB-writer's interface to the C C<realloc> function.
2080 void Renew(void* ptr, int nitems, type)
2083 Found in file handy.h
2088 The XSUB-writer's interface to the C C<realloc> function, with
2091 void Renewc(void* ptr, int nitems, type, cast)
2094 Found in file handy.h
2099 The XSUB-writer's interface to the C C<free> function.
2101 void Safefree(void* ptr)
2104 Found in file handy.h
2109 Perl's version of C<strdup()>. Returns a pointer to a newly allocated
2110 string which is a duplicate of C<pv>. The size of the string is
2111 determined by C<strlen()>. The memory allocated for the new string can
2112 be freed with the C<Safefree()> function.
2114 char* savepv(const char* pv)
2117 Found in file util.c
2122 Perl's version of what C<strndup()> would be if it existed. Returns a
2123 pointer to a newly allocated string which is a duplicate of the first
2124 C<len> bytes from C<pv>, plus a trailing NUL byte. The memory allocated for
2125 the new string can be freed with the C<Safefree()> function.
2127 char* savepvn(const char* pv, I32 len)
2130 Found in file util.c
2135 A version of C<savepv()> which allocates the duplicate string in memory
2136 which is shared between threads.
2138 char* savesharedpv(const char* pv)
2141 Found in file util.c
2146 A version of C<savepv()>/C<savepvn()> which gets the string to duplicate from
2147 the passed in SV using C<SvPV()>
2149 char* savesvpv(SV* sv)
2152 Found in file util.c
2157 This is an architecture-independent macro to copy one structure to another.
2159 void StructCopy(type src, type dest, type)
2162 Found in file handy.h
2167 The XSUB-writer's interface to the C C<memzero> function. The C<dest> is the
2168 destination, C<nitems> is the number of items, and C<type> is the type.
2170 void Zero(void* dest, int nitems, type)
2173 Found in file handy.h
2178 Like C<Zero> but returns dest. Useful for encouraging compilers to tail-call
2181 void * ZeroD(void* dest, int nitems, type)
2184 Found in file handy.h
2189 =head1 Miscellaneous Functions
2196 Analyses the string in order to make fast searches on it using fbm_instr()
2197 -- the Boyer-Moore algorithm.
2199 void fbm_compile(SV* sv, U32 flags)
2202 Found in file util.c
2207 Returns the location of the SV in the string delimited by C<str> and
2208 C<strend>. It returns C<NULL> if the string can't be found. The C<sv>
2209 does not have to be fbm_compiled, but the search will not be as fast
2212 char* fbm_instr(unsigned char* big, unsigned char* bigend, SV* littlesv, U32 flags)
2215 Found in file util.c
2220 Takes a sprintf-style format pattern and conventional
2221 (non-SV) arguments and returns the formatted string.
2223 (char *) Perl_form(pTHX_ const char* pat, ...)
2225 can be used any place a string (char *) is required:
2227 char * s = Perl_form("%d.%d",major,minor);
2229 Uses a single private buffer so if you want to format several strings you
2230 must explicitly copy the earlier strings away (and free the copies when you
2233 char* form(const char* pat, ...)
2236 Found in file util.c
2241 Fill the sv with current working directory
2243 int getcwd_sv(SV* sv)
2246 Found in file util.c
2251 The C library C<sprintf>, wrapped if necessary, to ensure that it will return
2252 the length of the string written to the buffer. Only rare pre-ANSI systems
2253 need the wrapper function - usually this is a direct call to C<sprintf>.
2255 int my_sprintf(char *buffer, const char *pat, ...)
2258 Found in file util.c
2263 Returns a new version object based on the passed in SV:
2265 SV *sv = new_version(SV *ver);
2267 Does not alter the passed in ver SV. See "upg_version" if you
2268 want to upgrade the SV.
2270 SV* new_version(SV *ver)
2273 Found in file util.c
2278 Returns a pointer to the next character after the parsed
2279 version string, as well as upgrading the passed in SV to
2282 Function must be called with an already existing SV like
2285 s = scan_version(s,SV *sv, bool qv);
2287 Performs some preprocessing to the string to ensure that
2288 it has the correct characteristics of a version. Flags the
2289 object if it contains an underscore (which denotes this
2290 is a alpha version). The boolean qv denotes that the version
2291 should be interpreted as if it had multiple decimals, even if
2294 const char* scan_version(const char *vstr, SV *sv, bool qv)
2297 Found in file util.c
2302 Test two strings to see if they are equal. Returns true or false.
2304 bool strEQ(char* s1, char* s2)
2307 Found in file handy.h
2312 Test two strings to see if the first, C<s1>, is greater than or equal to
2313 the second, C<s2>. Returns true or false.
2315 bool strGE(char* s1, char* s2)
2318 Found in file handy.h
2323 Test two strings to see if the first, C<s1>, is greater than the second,
2324 C<s2>. Returns true or false.
2326 bool strGT(char* s1, char* s2)
2329 Found in file handy.h
2334 Test two strings to see if the first, C<s1>, is less than or equal to the
2335 second, C<s2>. Returns true or false.
2337 bool strLE(char* s1, char* s2)
2340 Found in file handy.h
2345 Test two strings to see if the first, C<s1>, is less than the second,
2346 C<s2>. Returns true or false.
2348 bool strLT(char* s1, char* s2)
2351 Found in file handy.h
2356 Test two strings to see if they are different. Returns true or
2359 bool strNE(char* s1, char* s2)
2362 Found in file handy.h
2367 Test two strings to see if they are equal. The C<len> parameter indicates
2368 the number of bytes to compare. Returns true or false. (A wrapper for
2371 bool strnEQ(char* s1, char* s2, STRLEN len)
2374 Found in file handy.h
2379 Test two strings to see if they are different. The C<len> parameter
2380 indicates the number of bytes to compare. Returns true or false. (A
2381 wrapper for C<strncmp>).
2383 bool strnNE(char* s1, char* s2, STRLEN len)
2386 Found in file handy.h
2391 Dummy routine which "shares" an SV when there is no sharing module present.
2392 Or "locks" it. Or "unlocks" it. In other words, ignores its single SV argument.
2393 Exists to avoid test for a NULL function pointer and because it could
2394 potentially warn under some level of strict-ness.
2396 void sv_nosharing(SV *sv)
2399 Found in file util.c
2404 In-place upgrade of the supplied SV to a version object.
2406 SV *sv = upg_version(SV *sv);
2408 Returns a pointer to the upgraded SV.
2410 SV* upg_version(SV *ver)
2413 Found in file util.c
2418 Version object aware cmp. Both operands must already have been
2419 converted into version objects.
2421 int vcmp(SV *lvs, SV *rvs)
2424 Found in file util.c
2429 Accepts a version object and returns the normalized string
2430 representation. Call like:
2434 NOTE: you can pass either the object directly or the SV
2435 contained within the RV.
2440 Found in file util.c
2445 Accepts a version object and returns the normalized floating
2446 point representation. Call like:
2450 NOTE: you can pass either the object directly or the SV
2451 contained within the RV.
2456 Found in file util.c
2461 In order to maintain maximum compatibility with earlier versions
2462 of Perl, this function will return either the floating point
2463 notation or the multiple dotted notation, depending on whether
2464 the original version contained 1 or more dots, respectively
2466 SV* vstringify(SV *vs)
2469 Found in file util.c
2474 Validates that the SV contains a valid version object.
2476 bool vverify(SV *vobj);
2478 Note that it only confirms the bare minimum structure (so as not to get
2479 confused by derived classes which may contain additional hash entries):
2481 bool vverify(SV *vs)
2484 Found in file util.c
2489 =head1 Multicall Functions
2496 Declare local variables for a multicall. See L<perlcall/Lightweight Callbacks>.
2506 Make a lightweight callback. See L<perlcall/Lightweight Callbacks>.
2516 Closing bracket for a lightweight callback.
2517 See L<perlcall/Lightweight Callbacks>.
2524 =item PUSH_MULTICALL
2527 Opening bracket for a lightweight callback.
2528 See L<perlcall/Lightweight Callbacks>.
2538 =head1 Numeric functions
2545 converts a string representing a binary number to numeric form.
2547 On entry I<start> and I<*len> give the string to scan, I<*flags> gives
2548 conversion flags, and I<result> should be NULL or a pointer to an NV.
2549 The scan stops at the end of the string, or the first invalid character.
2550 Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in I<*flags>, encountering an
2551 invalid character will also trigger a warning.
2552 On return I<*len> is set to the length of the scanned string,
2553 and I<*flags> gives output flags.
2555 If the value is <= C<UV_MAX> it is returned as a UV, the output flags are clear,
2556 and nothing is written to I<*result>. If the value is > UV_MAX C<grok_bin>
2557 returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags,
2558 and writes the value to I<*result> (or the value is discarded if I<result>
2561 The binary number may optionally be prefixed with "0b" or "b" unless
2562 C<PERL_SCAN_DISALLOW_PREFIX> is set in I<*flags> on entry. If
2563 C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the binary
2564 number may use '_' characters to separate digits.
2566 UV grok_bin(const char* start, STRLEN* len_p, I32* flags, NV *result)
2569 Found in file numeric.c
2574 converts a string representing a hex number to numeric form.
2576 On entry I<start> and I<*len> give the string to scan, I<*flags> gives
2577 conversion flags, and I<result> should be NULL or a pointer to an NV.
2578 The scan stops at the end of the string, or the first invalid character.
2579 Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in I<*flags>, encountering an
2580 invalid character will also trigger a warning.
2581 On return I<*len> is set to the length of the scanned string,
2582 and I<*flags> gives output flags.
2584 If the value is <= UV_MAX it is returned as a UV, the output flags are clear,
2585 and nothing is written to I<*result>. If the value is > UV_MAX C<grok_hex>
2586 returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags,
2587 and writes the value to I<*result> (or the value is discarded if I<result>
2590 The hex number may optionally be prefixed with "0x" or "x" unless
2591 C<PERL_SCAN_DISALLOW_PREFIX> is set in I<*flags> on entry. If
2592 C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the hex
2593 number may use '_' characters to separate digits.
2595 UV grok_hex(const char* start, STRLEN* len_p, I32* flags, NV *result)
2598 Found in file numeric.c
2603 Recognise (or not) a number. The type of the number is returned
2604 (0 if unrecognised), otherwise it is a bit-ORed combination of
2605 IS_NUMBER_IN_UV, IS_NUMBER_GREATER_THAN_UV_MAX, IS_NUMBER_NOT_INT,
2606 IS_NUMBER_NEG, IS_NUMBER_INFINITY, IS_NUMBER_NAN (defined in perl.h).
2608 If the value of the number can fit an in UV, it is returned in the *valuep
2609 IS_NUMBER_IN_UV will be set to indicate that *valuep is valid, IS_NUMBER_IN_UV
2610 will never be set unless *valuep is valid, but *valuep may have been assigned
2611 to during processing even though IS_NUMBER_IN_UV is not set on return.
2612 If valuep is NULL, IS_NUMBER_IN_UV will be set for the same cases as when
2613 valuep is non-NULL, but no actual assignment (or SEGV) will occur.
2615 IS_NUMBER_NOT_INT will be set with IS_NUMBER_IN_UV if trailing decimals were
2616 seen (in which case *valuep gives the true value truncated to an integer), and
2617 IS_NUMBER_NEG if the number is negative (in which case *valuep holds the
2618 absolute value). IS_NUMBER_IN_UV is not set if e notation was used or the
2619 number is larger than a UV.
2621 int grok_number(const char *pv, STRLEN len, UV *valuep)
2624 Found in file numeric.c
2626 =item grok_numeric_radix
2627 X<grok_numeric_radix>
2629 Scan and skip for a numeric decimal separator (radix).
2631 bool grok_numeric_radix(const char **sp, const char *send)
2634 Found in file numeric.c
2639 converts a string representing an octal number to numeric form.
2641 On entry I<start> and I<*len> give the string to scan, I<*flags> gives
2642 conversion flags, and I<result> should be NULL or a pointer to an NV.
2643 The scan stops at the end of the string, or the first invalid character.
2644 Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in I<*flags>, encountering an
2645 invalid character will also trigger a warning.
2646 On return I<*len> is set to the length of the scanned string,
2647 and I<*flags> gives output flags.
2649 If the value is <= UV_MAX it is returned as a UV, the output flags are clear,
2650 and nothing is written to I<*result>. If the value is > UV_MAX C<grok_oct>
2651 returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags,
2652 and writes the value to I<*result> (or the value is discarded if I<result>
2655 If C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the octal
2656 number may use '_' characters to separate digits.
2658 UV grok_oct(const char* start, STRLEN* len_p, I32* flags, NV *result)
2661 Found in file numeric.c
2666 For backwards compatibility. Use C<grok_bin> instead.
2668 NV scan_bin(const char* start, STRLEN len, STRLEN* retlen)
2671 Found in file numeric.c
2676 For backwards compatibility. Use C<grok_hex> instead.
2678 NV scan_hex(const char* start, STRLEN len, STRLEN* retlen)
2681 Found in file numeric.c
2686 For backwards compatibility. Use C<grok_oct> instead.
2688 NV scan_oct(const char* start, STRLEN len, STRLEN* retlen)
2691 Found in file numeric.c
2696 =head1 Optree Manipulation Functions
2703 If C<cv> is a constant sub eligible for inlining. returns the constant
2704 value returned by the sub. Otherwise, returns NULL.
2706 Constant subs can be created with C<newCONSTSUB> or as described in
2707 L<perlsub/"Constant Functions">.
2709 SV* cv_const_sv(CV* cv)
2717 Creates a constant sub equivalent to Perl C<sub FOO () { 123 }> which is
2718 eligible for inlining at compile-time.
2720 CV* newCONSTSUB(HV* stash, const char* name, SV* sv)
2728 Used by C<xsubpp> to hook up XSUBs as Perl subs.
2736 =head1 Pad Data Structures
2743 Get the value at offset po in the current pad.
2744 Use macro PAD_SV instead of calling this function directly.
2746 SV* pad_sv(PADOFFSET po)
2754 =head1 Simple Exception Handling Macros
2761 Set up necessary local variables for exception handling.
2762 See L<perlguts/"Exception Handling">.
2767 Found in file XSUB.h
2772 Introduces a catch block. See L<perlguts/"Exception Handling">.
2775 Found in file XSUB.h
2780 Rethrows a previously caught exception. See L<perlguts/"Exception Handling">.
2785 Found in file XSUB.h
2790 Ends a try block. See L<perlguts/"Exception Handling">.
2793 Found in file XSUB.h
2795 =item XCPT_TRY_START
2798 Starts a try block. See L<perlguts/"Exception Handling">.
2801 Found in file XSUB.h
2806 =head1 Stack Manipulation Macros
2813 Declare a stack marker variable, C<mark>, for the XSUB. See C<MARK> and
2824 Saves the original stack mark for the XSUB. See C<ORIGMARK>.
2834 Declares a local copy of perl's stack pointer for the XSUB, available via
2835 the C<SP> macro. See C<SP>.
2845 Used to extend the argument stack for an XSUB's return values. Once
2846 used, guarantees that there is room for at least C<nitems> to be pushed
2849 void EXTEND(SP, int nitems)
2857 Stack marker variable for the XSUB. See C<dMARK>.
2865 Push an integer onto the stack. The stack must have room for this element.
2866 Handles 'set' magic. Does not use C<TARG>. See also C<PUSHi>, C<mXPUSHi>
2877 Push a double onto the stack. The stack must have room for this element.
2878 Handles 'set' magic. Does not use C<TARG>. See also C<PUSHn>, C<mXPUSHn>
2889 Push a string onto the stack. The stack must have room for this element.
2890 The C<len> indicates the length of the string. Handles 'set' magic. Does
2891 not use C<TARG>. See also C<PUSHp>, C<mXPUSHp> and C<XPUSHp>.
2893 void mPUSHp(char* str, STRLEN len)
2901 Push an unsigned integer onto the stack. The stack must have room for this
2902 element. Handles 'set' magic. Does not use C<TARG>. See also C<PUSHu>,
2903 C<mXPUSHu> and C<XPUSHu>.
2913 Push an integer onto the stack, extending the stack if necessary. Handles
2914 'set' magic. Does not use C<TARG>. See also C<XPUSHi>, C<mPUSHi> and
2925 Push a double onto the stack, extending the stack if necessary. Handles
2926 'set' magic. Does not use C<TARG>. See also C<XPUSHn>, C<mPUSHn> and
2937 Push a string onto the stack, extending the stack if necessary. The C<len>
2938 indicates the length of the string. Handles 'set' magic. Does not use
2939 C<TARG>. See also C<XPUSHp>, C<mPUSHp> and C<PUSHp>.
2941 void mXPUSHp(char* str, STRLEN len)
2949 Push an unsigned integer onto the stack, extending the stack if necessary.
2950 Handles 'set' magic. Does not use C<TARG>. See also C<XPUSHu>, C<mPUSHu>
2961 The original stack mark for the XSUB. See C<dORIGMARK>.
2969 Pops an integer off the stack.
2979 Pops a long off the stack.
2989 Pops a double off the stack.
2999 Pops a string off the stack. Deprecated. New code should use POPpx.
3009 Pops a string off the stack which must consist of bytes i.e. characters < 256.
3019 Pops a string off the stack.
3029 Pops an SV off the stack.
3039 Push an integer onto the stack. The stack must have room for this element.
3040 Handles 'set' magic. Uses C<TARG>, so C<dTARGET> or C<dXSTARG> should be
3041 called to declare it. Do not call multiple C<TARG>-oriented macros to
3042 return lists from XSUB's - see C<mPUSHi> instead. See also C<XPUSHi> and
3053 Opening bracket for arguments on a callback. See C<PUTBACK> and
3064 Push a new mortal SV onto the stack. The stack must have room for this
3065 element. Does not handle 'set' magic. Does not use C<TARG>. See also
3066 C<PUSHs>, C<XPUSHmortal> and C<XPUSHs>.
3076 Push a double onto the stack. The stack must have room for this element.
3077 Handles 'set' magic. Uses C<TARG>, so C<dTARGET> or C<dXSTARG> should be
3078 called to declare it. Do not call multiple C<TARG>-oriented macros to
3079 return lists from XSUB's - see C<mPUSHn> instead. See also C<XPUSHn> and
3090 Push a string onto the stack. The stack must have room for this element.
3091 The C<len> indicates the length of the string. Handles 'set' magic. Uses
3092 C<TARG>, so C<dTARGET> or C<dXSTARG> should be called to declare it. Do not
3093 call multiple C<TARG>-oriented macros to return lists from XSUB's - see
3094 C<mPUSHp> instead. See also C<XPUSHp> and C<mXPUSHp>.
3096 void PUSHp(char* str, STRLEN len)
3104 Push an SV onto the stack. The stack must have room for this element.
3105 Does not handle 'set' magic. Does not use C<TARG>. See also C<PUSHmortal>,
3106 C<XPUSHs> and C<XPUSHmortal>.
3116 Push an unsigned integer onto the stack. The stack must have room for this
3117 element. Handles 'set' magic. Uses C<TARG>, so C<dTARGET> or C<dXSTARG>
3118 should be called to declare it. Do not call multiple C<TARG>-oriented
3119 macros to return lists from XSUB's - see C<mPUSHu> instead. See also
3120 C<XPUSHu> and C<mXPUSHu>.
3130 Closing bracket for XSUB arguments. This is usually handled by C<xsubpp>.
3131 See C<PUSHMARK> and L<perlcall> for other uses.
3141 Stack pointer. This is usually handled by C<xsubpp>. See C<dSP> and
3150 Refetch the stack pointer. Used after a callback. See L<perlcall>.
3160 Push an integer onto the stack, extending the stack if necessary. Handles
3161 'set' magic. Uses C<TARG>, so C<dTARGET> or C<dXSTARG> should be called to
3162 declare it. Do not call multiple C<TARG>-oriented macros to return lists
3163 from XSUB's - see C<mXPUSHi> instead. See also C<PUSHi> and C<mPUSHi>.
3173 Push a new mortal SV onto the stack, extending the stack if necessary. Does
3174 not handle 'set' magic. Does not use C<TARG>. See also C<XPUSHs>,
3175 C<PUSHmortal> and C<PUSHs>.
3185 Push a double onto the stack, extending the stack if necessary. Handles
3186 'set' magic. Uses C<TARG>, so C<dTARGET> or C<dXSTARG> should be called to
3187 declare it. Do not call multiple C<TARG>-oriented macros to return lists
3188 from XSUB's - see C<mXPUSHn> instead. See also C<PUSHn> and C<mPUSHn>.
3198 Push a string onto the stack, extending the stack if necessary. The C<len>
3199 indicates the length of the string. Handles 'set' magic. Uses C<TARG>, so
3200 C<dTARGET> or C<dXSTARG> should be called to declare it. Do not call
3201 multiple C<TARG>-oriented macros to return lists from XSUB's - see
3202 C<mXPUSHp> instead. See also C<PUSHp> and C<mPUSHp>.
3204 void XPUSHp(char* str, STRLEN len)
3212 Push an SV onto the stack, extending the stack if necessary. Does not
3213 handle 'set' magic. Does not use C<TARG>. See also C<XPUSHmortal>,
3214 C<PUSHs> and C<PUSHmortal>.
3224 Push an unsigned integer onto the stack, extending the stack if necessary.
3225 Handles 'set' magic. Uses C<TARG>, so C<dTARGET> or C<dXSTARG> should be
3226 called to declare it. Do not call multiple C<TARG>-oriented macros to
3227 return lists from XSUB's - see C<mXPUSHu> instead. See also C<PUSHu> and
3238 Return from XSUB, indicating number of items on the stack. This is usually
3239 handled by C<xsubpp>.
3241 void XSRETURN(int nitems)
3244 Found in file XSUB.h
3246 =item XSRETURN_EMPTY
3249 Return an empty list from an XSUB immediately.
3254 Found in file XSUB.h
3259 Return an integer from an XSUB immediately. Uses C<XST_mIV>.
3261 void XSRETURN_IV(IV iv)
3264 Found in file XSUB.h
3269 Return C<&PL_sv_no> from an XSUB immediately. Uses C<XST_mNO>.
3274 Found in file XSUB.h
3279 Return a double from an XSUB immediately. Uses C<XST_mNV>.
3281 void XSRETURN_NV(NV nv)
3284 Found in file XSUB.h
3289 Return a copy of a string from an XSUB immediately. Uses C<XST_mPV>.
3291 void XSRETURN_PV(char* str)
3294 Found in file XSUB.h
3296 =item XSRETURN_UNDEF
3299 Return C<&PL_sv_undef> from an XSUB immediately. Uses C<XST_mUNDEF>.
3304 Found in file XSUB.h
3309 Return an integer from an XSUB immediately. Uses C<XST_mUV>.
3311 void XSRETURN_UV(IV uv)
3314 Found in file XSUB.h
3319 Return C<&PL_sv_yes> from an XSUB immediately. Uses C<XST_mYES>.
3324 Found in file XSUB.h
3329 Place an integer into the specified position C<pos> on the stack. The
3330 value is stored in a new mortal SV.
3332 void XST_mIV(int pos, IV iv)
3335 Found in file XSUB.h
3340 Place C<&PL_sv_no> into the specified position C<pos> on the
3343 void XST_mNO(int pos)
3346 Found in file XSUB.h
3351 Place a double into the specified position C<pos> on the stack. The value
3352 is stored in a new mortal SV.
3354 void XST_mNV(int pos, NV nv)
3357 Found in file XSUB.h
3362 Place a copy of a string into the specified position C<pos> on the stack.
3363 The value is stored in a new mortal SV.
3365 void XST_mPV(int pos, char* str)
3368 Found in file XSUB.h
3373 Place C<&PL_sv_undef> into the specified position C<pos> on the
3376 void XST_mUNDEF(int pos)
3379 Found in file XSUB.h
3384 Place C<&PL_sv_yes> into the specified position C<pos> on the
3387 void XST_mYES(int pos)
3390 Found in file XSUB.h
3402 An enum of flags for Perl types. These are found in the file B<sv.h>
3403 in the C<svtype> enum. Test these flags with the C<SvTYPE> macro.
3411 Integer type flag for scalars. See C<svtype>.
3419 Double type flag for scalars. See C<svtype>.
3427 Pointer type flag for scalars. See C<svtype>.
3435 Type flag for arrays. See C<svtype>.
3443 Type flag for code refs. See C<svtype>.
3451 Type flag for hashes. See C<svtype>.
3459 Type flag for blessed scalars. See C<svtype>.
3467 =head1 SV Manipulation Functions
3474 Returns the SV of the specified Perl scalar. If C<create> is set and the
3475 Perl variable does not exist then it will be created. If C<create> is not
3476 set and the variable does not exist then NULL is returned.
3478 NOTE: the perl_ form of this function is deprecated.
3480 SV* get_sv(const char* name, I32 create)
3483 Found in file perl.c
3488 Creates an RV wrapper for an SV. The reference count for the original SV is
3491 SV* newRV_inc(SV* sv)
3499 Returns the length of the string which is in the SV. See C<SvLEN>.
3501 STRLEN SvCUR(SV* sv)
3509 Set the current length of the string which is in the SV. See C<SvCUR>
3512 void SvCUR_set(SV* sv, STRLEN len)
3520 Returns a pointer to the last character in the string which is in the SV.
3521 See C<SvCUR>. Access the character as *(SvEND(sv)).
3531 Expands the character buffer in the SV so that it has room for the
3532 indicated number of bytes (remember to reserve space for an extra trailing
3533 NUL character). Calls C<sv_grow> to perform the expansion if necessary.
3534 Returns a pointer to the character buffer.
3536 char * SvGROW(SV* sv, STRLEN len)
3544 Returns a boolean indicating whether the SV contains an integer.
3554 Returns a boolean indicating whether the SV contains an integer. Checks
3555 the B<private> setting. Use C<SvIOK>.
3565 Returns a boolean indicating whether the SV contains a signed integer.
3567 bool SvIOK_notUV(SV* sv)
3575 Unsets the IV status of an SV.
3577 void SvIOK_off(SV* sv)
3585 Tells an SV that it is an integer.
3587 void SvIOK_on(SV* sv)
3595 Tells an SV that it is an integer and disables all other OK bits.
3597 void SvIOK_only(SV* sv)
3605 Tells and SV that it is an unsigned integer and disables all other OK bits.
3607 void SvIOK_only_UV(SV* sv)
3615 Returns a boolean indicating whether the SV contains an unsigned integer.
3617 bool SvIOK_UV(SV* sv)
3625 Returns a boolean indicating whether the SV is Copy-On-Write. (either shared
3626 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
3629 bool SvIsCOW(SV* sv)
3634 =item SvIsCOW_shared_hash
3635 X<SvIsCOW_shared_hash>
3637 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
3640 bool SvIsCOW_shared_hash(SV* sv)
3648 Coerces the given SV to an integer and returns it. See C<SvIVx> for a
3649 version which guarantees to evaluate sv only once.
3659 Returns the raw value in the SV's IV slot, without checks or conversions.
3660 Only use when you are sure SvIOK is true. See also C<SvIV()>.
3670 Coerces the given SV to an integer and returns it. Guarantees to evaluate
3671 sv only once. Use the more efficient C<SvIV> otherwise.
3681 Like C<SvIV> but doesn't process magic.
3683 IV SvIV_nomg(SV* sv)
3691 Set the value of the IV pointer in sv to val. It is possible to perform
3692 the same function of this macro with an lvalue assignment to C<SvIVX>.
3693 With future Perls, however, it will be more efficient to use
3694 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
3696 void SvIV_set(SV* sv, IV val)
3704 Returns the size of the string buffer in the SV, not including any part
3705 attributable to C<SvOOK>. See C<SvCUR>.
3707 STRLEN SvLEN(SV* sv)
3715 Set the actual length of the string which is in the SV. See C<SvIV_set>.
3717 void SvLEN_set(SV* sv, STRLEN len)
3725 Set the value of the MAGIC pointer in sv to val. See C<SvIV_set>.
3727 void SvMAGIC_set(SV* sv, MAGIC* val)
3735 Returns a boolean indicating whether the SV contains a number, integer or
3746 Returns a boolean indicating whether the SV contains a number, integer or
3747 double. Checks the B<private> setting. Use C<SvNIOK>.
3749 bool SvNIOKp(SV* sv)
3757 Unsets the NV/IV status of an SV.
3759 void SvNIOK_off(SV* sv)
3767 Returns a boolean indicating whether the SV contains a double.
3777 Returns a boolean indicating whether the SV contains a double. Checks the
3778 B<private> setting. Use C<SvNOK>.
3788 Unsets the NV status of an SV.
3790 void SvNOK_off(SV* sv)
3798 Tells an SV that it is a double.
3800 void SvNOK_on(SV* sv)
3808 Tells an SV that it is a double and disables all other OK bits.
3810 void SvNOK_only(SV* sv)
3818 Coerce the given SV to a double and return it. See C<SvNVx> for a version
3819 which guarantees to evaluate sv only once.
3829 Returns the raw value in the SV's NV slot, without checks or conversions.
3830 Only use when you are sure SvNOK is true. See also C<SvNV()>.
3840 Coerces the given SV to a double and returns it. Guarantees to evaluate
3841 sv only once. Use the more efficient C<SvNV> otherwise.
3851 Set the value of the NV pointer in sv to val. See C<SvIV_set>.
3853 void SvNV_set(SV* sv, NV val)
3861 Returns a boolean indicating whether the value is an SV. It also tells
3862 whether the value is defined or not.
3872 Returns a boolean indicating whether the SvIVX is a valid offset value for
3873 the SvPVX. This hack is used internally to speed up removal of characters
3874 from the beginning of a SvPV. When SvOOK is true, then the start of the
3875 allocated string buffer is really (SvPVX - SvIVX).
3885 Returns a boolean indicating whether the SV contains a character
3896 Returns a boolean indicating whether the SV contains a character string.
3897 Checks the B<private> setting. Use C<SvPOK>.
3907 Unsets the PV status of an SV.
3909 void SvPOK_off(SV* sv)
3917 Tells an SV that it is a string.
3919 void SvPOK_on(SV* sv)
3927 Tells an SV that it is a string and disables all other OK bits.
3928 Will also turn off the UTF-8 status.
3930 void SvPOK_only(SV* sv)
3935 =item SvPOK_only_UTF8
3938 Tells an SV that it is a string and disables all other OK bits,
3939 and leaves the UTF-8 status as it was.
3941 void SvPOK_only_UTF8(SV* sv)
3949 Returns a pointer to the string in the SV, or a stringified form of
3950 the SV if the SV does not contain a string. The SV may cache the
3951 stringified version becoming C<SvPOK>. Handles 'get' magic. See also
3952 C<SvPVx> for a version which guarantees to evaluate sv only once.
3954 char* SvPV(SV* sv, STRLEN len)
3962 Like C<SvPV>, but converts sv to byte representation first if necessary.
3964 char* SvPVbyte(SV* sv, STRLEN len)
3972 Like C<SvPV>, but converts sv to byte representation first if necessary.
3973 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
3976 char* SvPVbytex(SV* sv, STRLEN len)
3981 =item SvPVbytex_force
3984 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
3985 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte_force>
3988 char* SvPVbytex_force(SV* sv, STRLEN len)
3993 =item SvPVbyte_force
3996 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
3998 char* SvPVbyte_force(SV* sv, STRLEN len)
4003 =item SvPVbyte_nolen
4006 Like C<SvPV_nolen>, but converts sv to byte representation first if necessary.
4008 char* SvPVbyte_nolen(SV* sv)
4016 Like C<SvPV>, but converts sv to utf8 first if necessary.
4018 char* SvPVutf8(SV* sv, STRLEN len)
4026 Like C<SvPV>, but converts sv to utf8 first if necessary.
4027 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8>
4030 char* SvPVutf8x(SV* sv, STRLEN len)
4035 =item SvPVutf8x_force
4038 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
4039 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8_force>
4042 char* SvPVutf8x_force(SV* sv, STRLEN len)
4047 =item SvPVutf8_force
4050 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
4052 char* SvPVutf8_force(SV* sv, STRLEN len)
4057 =item SvPVutf8_nolen
4060 Like C<SvPV_nolen>, but converts sv to utf8 first if necessary.
4062 char* SvPVutf8_nolen(SV* sv)
4070 Returns a pointer to the physical string in the SV. The SV must contain a
4081 A version of C<SvPV> which guarantees to evaluate sv only once.
4083 char* SvPVx(SV* sv, STRLEN len)
4091 Like C<SvPV> but will force the SV into containing just a string
4092 (C<SvPOK_only>). You want force if you are going to update the C<SvPVX>
4095 char* SvPV_force(SV* sv, STRLEN len)
4100 =item SvPV_force_nomg
4103 Like C<SvPV> but will force the SV into containing just a string
4104 (C<SvPOK_only>). You want force if you are going to update the C<SvPVX>
4105 directly. Doesn't process magic.
4107 char* SvPV_force_nomg(SV* sv, STRLEN len)
4115 Returns a pointer to the string in the SV, or a stringified form of
4116 the SV if the SV does not contain a string. The SV may cache the
4117 stringified form becoming C<SvPOK>. Handles 'get' magic.
4119 char* SvPV_nolen(SV* sv)
4127 Like C<SvPV> but doesn't process magic.
4129 char* SvPV_nomg(SV* sv, STRLEN len)
4137 Set the value of the PV pointer in sv to val. See C<SvIV_set>.
4139 void SvPV_set(SV* sv, char* val)
4147 Returns the value of the object's reference count.
4149 U32 SvREFCNT(SV* sv)
4157 Decrements the reference count of the given SV.
4159 void SvREFCNT_dec(SV* sv)
4167 Increments the reference count of the given SV.
4169 SV* SvREFCNT_inc(SV* sv)
4174 =item SvREFCNT_inc_NN
4177 Same as SvREFCNT_inc, but can only be used if you know I<sv>
4178 is not NULL. Since we don't have to check the NULLness, it's faster
4181 SV* SvREFCNT_inc_NN(SV* sv)
4186 =item SvREFCNT_inc_simple
4187 X<SvREFCNT_inc_simple>
4189 Same as SvREFCNT_inc, but can only be used with simple variables, not
4190 expressions or pointer dereferences. Since we don't have to store a
4191 temporary value, it's faster.
4193 SV* SvREFCNT_inc_simple(SV* sv)
4198 =item SvREFCNT_inc_simple_NN
4199 X<SvREFCNT_inc_simple_NN>
4201 Same as SvREFCNT_inc_simple, but can only be used if you know I<sv>
4202 is not NULL. Since we don't have to check the NULLness, it's faster
4205 SV* SvREFCNT_inc_simple_NN(SV* sv)
4210 =item SvREFCNT_inc_simple_void
4211 X<SvREFCNT_inc_simple_void>
4213 Same as SvREFCNT_inc_simple, but can only be used if you don't need the
4214 return value. The macro doesn't need to return a meaningful value.
4216 SV* SvREFCNT_inc_simple_void(SV* sv)
4221 =item SvREFCNT_inc_void
4222 X<SvREFCNT_inc_void>
4224 Same as SvREFCNT_inc, but can only be used if you don't need the
4225 return value. The macro doesn't need to return a meaningful value.
4227 SV* SvREFCNT_inc_void(SV* sv)
4232 =item SvREFCNT_inc_void_NN
4233 X<SvREFCNT_inc_void_NN>
4235 Same as SvREFCNT_inc, but can only be used if you don't need the return
4236 value, and you know that I<sv> is not NULL. The macro doesn't need
4237 to return a meaningful value, or check for NULLness, so it's smaller
4240 SV* SvREFCNT_inc_void_NN(SV* sv)
4248 Tests if the SV is an RV.
4258 Unsets the RV status of an SV.
4260 void SvROK_off(SV* sv)
4268 Tells an SV that it is an RV.
4270 void SvROK_on(SV* sv)
4278 Dereferences an RV to return the SV.
4288 Set the value of the RV pointer in sv to val. See C<SvIV_set>.
4290 void SvRV_set(SV* sv, SV* val)
4298 Returns the stash of the SV.
4308 Set the value of the STASH pointer in sv to val. See C<SvIV_set>.
4310 void SvSTASH_set(SV* sv, STASH* val)
4318 Taints an SV if tainting is enabled.
4320 void SvTAINT(SV* sv)
4328 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
4331 bool SvTAINTED(SV* sv)
4339 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
4340 some of Perl's fundamental security features. XS module authors should not
4341 use this function unless they fully understand all the implications of
4342 unconditionally untainting the value. Untainting should be done in the
4343 standard perl fashion, via a carefully crafted regexp, rather than directly
4344 untainting variables.
4346 void SvTAINTED_off(SV* sv)
4354 Marks an SV as tainted if tainting is enabled.
4356 void SvTAINTED_on(SV* sv)
4364 Returns a boolean indicating whether Perl would evaluate the SV as true or
4365 false, defined or undefined. Does not handle 'get' magic.
4375 Returns the type of the SV. See C<svtype>.
4377 svtype SvTYPE(SV* sv)
4385 Returns a boolean indicating whether the SV contains an unsigned integer.
4395 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
4396 perform the upgrade if necessary. See C<svtype>.
4398 void SvUPGRADE(SV* sv, svtype type)
4406 Returns a boolean indicating whether the SV contains UTF-8 encoded data.
4416 Unsets the UTF-8 status of an SV.
4418 void SvUTF8_off(SV *sv)
4426 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
4427 Do not use frivolously.
4429 void SvUTF8_on(SV *sv)
4437 Coerces the given SV to an unsigned integer and returns it. See C<SvUVx>
4438 for a version which guarantees to evaluate sv only once.
4448 Returns the raw value in the SV's UV slot, without checks or conversions.
4449 Only use when you are sure SvIOK is true. See also C<SvUV()>.
4459 Coerces the given SV to an unsigned integer and returns it. Guarantees to
4460 evaluate sv only once. Use the more efficient C<SvUV> otherwise.
4470 Like C<SvUV> but doesn't process magic.
4472 UV SvUV_nomg(SV* sv)
4480 Set the value of the UV pointer in sv to val. See C<SvIV_set>.
4482 void SvUV_set(SV* sv, UV val)
4490 Returns a boolean indicating whether the SV contains a v-string.
4497 =item sv_catpvn_nomg
4500 Like C<sv_catpvn> but doesn't process magic.
4502 void sv_catpvn_nomg(SV* sv, const char* ptr, STRLEN len)
4510 Like C<sv_catsv> but doesn't process magic.
4512 void sv_catsv_nomg(SV* dsv, SV* ssv)
4517 =item sv_derived_from
4520 Returns a boolean indicating whether the SV is derived from the specified
4521 class. This is the function that implements C<UNIVERSAL::isa>. It works
4522 for class names as well as for objects.
4524 bool sv_derived_from(SV* sv, const char* name)
4527 Found in file universal.c
4529 =item sv_report_used
4532 Dump the contents of all SVs not yet freed. (Debugging aid).
4534 void sv_report_used()
4542 Like C<sv_setsv> but doesn't process magic.
4544 void sv_setsv_nomg(SV* dsv, SV* ssv)
4552 =head1 SV-Body Allocation
4556 =item looks_like_number
4557 X<looks_like_number>
4559 Test if the content of an SV looks like a number (or is a number).
4560 C<Inf> and C<Infinity> are treated as numbers (so will not issue a
4561 non-numeric warning), even if your atof() doesn't grok them.
4563 I32 looks_like_number(SV* sv)
4571 Creates an RV wrapper for an SV. The reference count for the original
4572 SV is B<not> incremented.
4574 SV* newRV_noinc(SV* sv)
4582 Creates a new SV. A non-zero C<len> parameter indicates the number of
4583 bytes of preallocated string space the SV should have. An extra byte for a
4584 trailing NUL is also reserved. (SvPOK is not set for the SV even if string
4585 space is allocated.) The reference count for the new SV is set to 1.
4587 In 5.9.3, newSV() replaces the older NEWSV() API, and drops the first
4588 parameter, I<x>, a debug aid which allowed callers to identify themselves.
4589 This aid has been superseded by a new build option, PERL_MEM_LOG (see
4590 L<perlhack/PERL_MEM_LOG>). The older API is still there for use in XS
4591 modules supporting older perls.
4593 SV* newSV(STRLEN len)
4601 Creates a new SV from the hash key structure. It will generate scalars that
4602 point to the shared string table where possible. Returns a new (undefined)
4603 SV if the hek is NULL.
4605 SV* newSVhek(const HEK *hek)
4613 Creates a new SV and copies an integer into it. The reference count for the
4624 Creates a new SV and copies a floating point value into it.
4625 The reference count for the SV is set to 1.
4635 Creates a new SV and copies a string into it. The reference count for the
4636 SV is set to 1. If C<len> is zero, Perl will compute the length using
4637 strlen(). For efficiency, consider using C<newSVpvn> instead.
4639 SV* newSVpv(const char* s, STRLEN len)
4647 Creates a new SV and initializes it with the string formatted like
4650 SV* newSVpvf(const char* pat, ...)
4658 Creates a new SV and copies a string into it. The reference count for the
4659 SV is set to 1. Note that if C<len> is zero, Perl will create a zero length
4660 string. You are responsible for ensuring that the source string is at least
4661 C<len> bytes long. If the C<s> argument is NULL the new SV will be undefined.
4663 SV* newSVpvn(const char* s, STRLEN len)
4668 =item newSVpvn_share
4671 Creates a new SV with its SvPVX_const pointing to a shared string in the string
4672 table. If the string does not already exist in the table, it is created
4673 first. Turns on READONLY and FAKE. The string's hash is stored in the UV
4674 slot of the SV; if the C<hash> parameter is non-zero, that value is used;
4675 otherwise the hash is computed. The idea here is that as the string table
4676 is used for shared hash keys these strings will have SvPVX_const == HeKEY and
4677 hash lookup will avoid string compare.
4679 SV* newSVpvn_share(const char* s, I32 len, U32 hash)
4687 Creates a new SV for the RV, C<rv>, to point to. If C<rv> is not an RV then
4688 it will be upgraded to one. If C<classname> is non-null then the new SV will
4689 be blessed in the specified package. The new SV is returned and its
4690 reference count is 1.
4692 SV* newSVrv(SV* rv, const char* classname)
4700 Creates a new SV which is an exact duplicate of the original SV.
4703 SV* newSVsv(SV* old)
4711 Creates a new SV and copies an unsigned integer into it.
4712 The reference count for the SV is set to 1.
4722 This function is only called on magical items, and is only used by
4723 sv_true() or its macro equivalent.
4725 bool sv_2bool(SV* sv)
4733 Using various gambits, try to get a CV from an SV; in addition, try if
4734 possible to set C<*st> and C<*gvp> to the stash and GV associated with it.
4735 The flags in C<lref> are passed to sv_fetchsv.
4737 CV* sv_2cv(SV* sv, HV** st, GV** gvp, I32 lref)
4745 Using various gambits, try to get an IO from an SV: the IO slot if its a
4746 GV; or the recursive result if we're an RV; or the IO slot of the symbol
4747 named after the PV if we're a string.
4757 Return the integer value of an SV, doing any necessary string
4758 conversion. If flags includes SV_GMAGIC, does an mg_get() first.
4759 Normally used via the C<SvIV(sv)> and C<SvIVx(sv)> macros.
4761 IV sv_2iv_flags(SV* sv, I32 flags)
4769 Marks an existing SV as mortal. The SV will be destroyed "soon", either
4770 by an explicit call to FREETMPS, or by an implicit call at places such as
4771 statement boundaries. SvTEMP() is turned on which means that the SV's
4772 string buffer can be "stolen" if this SV is copied. See also C<sv_newmortal>
4773 and C<sv_mortalcopy>.
4775 SV* sv_2mortal(SV* sv)
4783 Return the num value of an SV, doing any necessary string or integer
4784 conversion, magic etc. Normally used via the C<SvNV(sv)> and C<SvNVx(sv)>
4795 Return a pointer to the byte-encoded representation of the SV, and set *lp
4796 to its length. May cause the SV to be downgraded from UTF-8 as a
4799 Usually accessed via the C<SvPVbyte> macro.
4801 char* sv_2pvbyte(SV* sv, STRLEN* lp)
4809 Return a pointer to the UTF-8-encoded representation of the SV, and set *lp
4810 to its length. May cause the SV to be upgraded to UTF-8 as a side-effect.
4812 Usually accessed via the C<SvPVutf8> macro.
4814 char* sv_2pvutf8(SV* sv, STRLEN* lp)
4822 Returns a pointer to the string value of an SV, and sets *lp to its length.
4823 If flags includes SV_GMAGIC, does an mg_get() first. Coerces sv to a string
4825 Normally invoked via the C<SvPV_flags> macro. C<sv_2pv()> and C<sv_2pv_nomg>
4826 usually end up here too.
4828 char* sv_2pv_flags(SV* sv, STRLEN* lp, I32 flags)
4836 Return the unsigned integer value of an SV, doing any necessary string
4837 conversion. If flags includes SV_GMAGIC, does an mg_get() first.
4838 Normally used via the C<SvUV(sv)> and C<SvUVx(sv)> macros.
4840 UV sv_2uv_flags(SV* sv, I32 flags)
4848 Remove any string offset. You should normally use the C<SvOOK_off> macro
4851 int sv_backoff(SV* sv)
4859 Blesses an SV into a specified package. The SV must be an RV. The package
4860 must be designated by its stash (see C<gv_stashpv()>). The reference count
4861 of the SV is unaffected.
4863 SV* sv_bless(SV* sv, HV* stash)
4871 Concatenates the string onto the end of the string which is in the SV.
4872 If the SV has the UTF-8 status set, then the bytes appended should be
4873 valid UTF-8. Handles 'get' magic, but not 'set' magic. See C<sv_catpv_mg>.
4875 void sv_catpv(SV* sv, const char* ptr)
4883 Processes its arguments like C<sprintf> and appends the formatted
4884 output to an SV. If the appended data contains "wide" characters
4885 (including, but not limited to, SVs with a UTF-8 PV formatted with %s,
4886 and characters >255 formatted with %c), the original SV might get
4887 upgraded to UTF-8. Handles 'get' magic, but not 'set' magic. See
4888 C<sv_catpvf_mg>. If the original SV was UTF-8, the pattern should be
4889 valid UTF-8; if the original SV was bytes, the pattern should be too.
4891 void sv_catpvf(SV* sv, const char* pat, ...)
4899 Like C<sv_catpvf>, but also handles 'set' magic.
4901 void sv_catpvf_mg(SV *sv, const char* pat, ...)
4909 Concatenates the string onto the end of the string which is in the SV. The
4910 C<len> indicates number of bytes to copy. If the SV has the UTF-8
4911 status set, then the bytes appended should be valid UTF-8.
4912 Handles 'get' magic, but not 'set' magic. See C<sv_catpvn_mg>.
4914 void sv_catpvn(SV* sv, const char* ptr, STRLEN len)
4919 =item sv_catpvn_flags
4922 Concatenates the string onto the end of the string which is in the SV. The
4923 C<len> indicates number of bytes to copy. If the SV has the UTF-8
4924 status set, then the bytes appended should be valid UTF-8.
4925 If C<flags> has C<SV_GMAGIC> bit set, will C<mg_get> on C<dsv> if
4926 appropriate, else not. C<sv_catpvn> and C<sv_catpvn_nomg> are implemented
4927 in terms of this function.
4929 void sv_catpvn_flags(SV* sv, const char* ptr, STRLEN len, I32 flags)
4937 Like C<sv_catpv>, but also handles 'set' magic.
4939 void sv_catpv_mg(SV *sv, const char *ptr)
4947 Concatenates the string from SV C<ssv> onto the end of the string in
4948 SV C<dsv>. Modifies C<dsv> but not C<ssv>. Handles 'get' magic, but
4949 not 'set' magic. See C<sv_catsv_mg>.
4951 void sv_catsv(SV* dsv, SV* ssv)
4956 =item sv_catsv_flags
4959 Concatenates the string from SV C<ssv> onto the end of the string in
4960 SV C<dsv>. Modifies C<dsv> but not C<ssv>. If C<flags> has C<SV_GMAGIC>
4961 bit set, will C<mg_get> on the SVs if appropriate, else not. C<sv_catsv>
4962 and C<sv_catsv_nomg> are implemented in terms of this function.
4964 void sv_catsv_flags(SV* dsv, SV* ssv, I32 flags)
4972 Efficient removal of characters from the beginning of the string buffer.
4973 SvPOK(sv) must be true and the C<ptr> must be a pointer to somewhere inside
4974 the string buffer. The C<ptr> becomes the first character of the adjusted
4975 string. Uses the "OOK hack".
4976 Beware: after this function returns, C<ptr> and SvPVX_const(sv) may no longer
4977 refer to the same chunk of data.
4979 void sv_chop(SV* sv, const char* ptr)
4987 Clear an SV: call any destructors, free up any memory used by the body,
4988 and free the body itself. The SV's head is I<not> freed, although
4989 its type is set to all 1's so that it won't inadvertently be assumed
4990 to be live during global destruction etc.
4991 This function should only be called when REFCNT is zero. Most of the time
4992 you'll want to call C<sv_free()> (or its macro wrapper C<SvREFCNT_dec>)
4995 void sv_clear(SV* sv)
5003 Compares the strings in two SVs. Returns -1, 0, or 1 indicating whether the
5004 string in C<sv1> is less than, equal to, or greater than the string in
5005 C<sv2>. Is UTF-8 and 'use bytes' aware, handles get magic, and will
5006 coerce its args to strings if necessary. See also C<sv_cmp_locale>.
5008 I32 sv_cmp(SV* sv1, SV* sv2)
5016 Compares the strings in two SVs in a locale-aware manner. Is UTF-8 and
5017 'use bytes' aware, handles get magic, and will coerce its args to strings
5018 if necessary. See also C<sv_cmp_locale>. See also C<sv_cmp>.
5020 I32 sv_cmp_locale(SV* sv1, SV* sv2)
5028 Add Collate Transform magic to an SV if it doesn't already have it.
5030 Any scalar variable may carry PERL_MAGIC_collxfrm magic that contains the
5031 scalar data of the variable, but transformed to such a format that a normal
5032 memory comparison can be used to compare the data according to the locale
5035 char* sv_collxfrm(SV* sv, STRLEN* nxp)
5043 Copies a stringified representation of the source SV into the
5044 destination SV. Automatically performs any necessary mg_get and
5045 coercion of numeric values into strings. Guaranteed to preserve
5046 UTF-8 flag even from overloaded objects. Similar in nature to
5047 sv_2pv[_flags] but operates directly on an SV instead of just the
5048 string. Mostly uses sv_2pv_flags to do its work, except when that
5049 would lose the UTF-8'ness of the PV.
5051 void sv_copypv(SV* dsv, SV* ssv)
5059 Auto-decrement of the value in the SV, doing string to numeric conversion
5060 if necessary. Handles 'get' magic.
5070 Returns a boolean indicating whether the strings in the two SVs are
5071 identical. Is UTF-8 and 'use bytes' aware, handles get magic, and will
5072 coerce its args to strings if necessary.
5074 I32 sv_eq(SV* sv1, SV* sv2)
5079 =item sv_force_normal_flags
5080 X<sv_force_normal_flags>
5082 Undo various types of fakery on an SV: if the PV is a shared string, make
5083 a private copy; if we're a ref, stop refing; if we're a glob, downgrade to
5084 an xpvmg; if we're a copy-on-write scalar, this is the on-write time when
5085 we do the copy, and is also used locally. If C<SV_COW_DROP_PV> is set
5086 then a copy-on-write scalar drops its PV buffer (if any) and becomes
5087 SvPOK_off rather than making a copy. (Used where this scalar is about to be
5088 set to some other value.) In addition, the C<flags> parameter gets passed to
5089 C<sv_unref_flags()> when unrefing. C<sv_force_normal> calls this function
5090 with flags set to 0.
5092 void sv_force_normal_flags(SV *sv, U32 flags)
5100 Decrement an SV's reference count, and if it drops to zero, call
5101 C<sv_clear> to invoke destructors and free up any memory used by
5102 the body; finally, deallocate the SV's head itself.
5103 Normally called via a wrapper macro C<SvREFCNT_dec>.
5105 void sv_free(SV* sv)
5113 Get a line from the filehandle and store it into the SV, optionally
5114 appending to the currently-stored string.
5116 char* sv_gets(SV* sv, PerlIO* fp, I32 append)
5124 Expands the character buffer in the SV. If necessary, uses C<sv_unref> and
5125 upgrades the SV to C<SVt_PV>. Returns a pointer to the character buffer.
5126 Use the C<SvGROW> wrapper instead.
5128 char* sv_grow(SV* sv, STRLEN newlen)
5136 Auto-increment of the value in the SV, doing string to numeric conversion
5137 if necessary. Handles 'get' magic.
5147 Inserts a string at the specified offset/length within the SV. Similar to
5148 the Perl substr() function.
5150 void sv_insert(SV* bigsv, STRLEN offset, STRLEN len, const char* little, STRLEN littlelen)
5158 Returns a boolean indicating whether the SV is blessed into the specified
5159 class. This does not check for subtypes; use C<sv_derived_from> to verify
5160 an inheritance relationship.
5162 int sv_isa(SV* sv, const char* name)
5170 Returns a boolean indicating whether the SV is an RV pointing to a blessed
5171 object. If the SV is not an RV, or if the object is not blessed, then this
5174 int sv_isobject(SV* sv)
5182 Returns the length of the string in the SV. Handles magic and type
5183 coercion. See also C<SvCUR>, which gives raw access to the xpv_cur slot.
5185 STRLEN sv_len(SV* sv)
5193 Returns the number of characters in the string in an SV, counting wide
5194 UTF-8 bytes as a single character. Handles magic and type coercion.
5196 STRLEN sv_len_utf8(SV* sv)
5204 Adds magic to an SV. First upgrades C<sv> to type C<SVt_PVMG> if necessary,
5205 then adds a new magic item of type C<how> to the head of the magic list.
5207 See C<sv_magicext> (which C<sv_magic> now calls) for a description of the
5208 handling of the C<name> and C<namlen> arguments.
5210 You need to use C<sv_magicext> to add magic to SvREADONLY SVs and also
5211 to add more than one instance of the same 'how'.
5213 void sv_magic(SV* sv, SV* obj, int how, const char* name, I32 namlen)
5221 Adds magic to an SV, upgrading it if necessary. Applies the
5222 supplied vtable and returns a pointer to the magic added.
5224 Note that C<sv_magicext> will allow things that C<sv_magic> will not.
5225 In particular, you can add magic to SvREADONLY SVs, and add more than
5226 one instance of the same 'how'.
5228 If C<namlen> is greater than zero then a C<savepvn> I<copy> of C<name> is
5229 stored, if C<namlen> is zero then C<name> is stored as-is and - as another
5230 special case - if C<(name && namlen == HEf_SVKEY)> then C<name> is assumed
5231 to contain an C<SV*> and is stored as-is with its REFCNT incremented.
5233 (This is now used as a subroutine by C<sv_magic>.)
5235 MAGIC * sv_magicext(SV* sv, SV* obj, int how, MGVTBL *vtbl, const char* name, I32 namlen)
5243 Creates a new SV which is a copy of the original SV (using C<sv_setsv>).
5244 The new SV is marked as mortal. It will be destroyed "soon", either by an
5245 explicit call to FREETMPS, or by an implicit call at places such as
5246 statement boundaries. See also C<sv_newmortal> and C<sv_2mortal>.
5248 SV* sv_mortalcopy(SV* oldsv)
5256 Creates a new null SV which is mortal. The reference count of the SV is
5257 set to 1. It will be destroyed "soon", either by an explicit call to
5258 FREETMPS, or by an implicit call at places such as statement boundaries.
5259 See also C<sv_mortalcopy> and C<sv_2mortal>.
5269 Increment an SV's reference count. Use the C<SvREFCNT_inc()> wrapper
5272 SV* sv_newref(SV* sv)
5280 Converts the value pointed to by offsetp from a count of bytes from the
5281 start of the string, to a count of the equivalent number of UTF-8 chars.
5282 Handles magic and type coercion.
5284 void sv_pos_b2u(SV* sv, I32* offsetp)
5292 Converts the value pointed to by offsetp from a count of UTF-8 chars from
5293 the start of the string, to a count of the equivalent number of bytes; if
5294 lenp is non-zero, it does the same to lenp, but this time starting from
5295 the offset, rather than from the start of the string. Handles magic and
5298 void sv_pos_u2b(SV* sv, I32* offsetp, I32* lenp)
5303 =item sv_pvbyten_force
5306 The backend for the C<SvPVbytex_force> macro. Always use the macro instead.
5308 char* sv_pvbyten_force(SV* sv, STRLEN* lp)
5316 Get a sensible string out of the SV somehow.
5317 A private implementation of the C<SvPV_force> macro for compilers which
5318 can't cope with complex macro expressions. Always use the macro instead.
5320 char* sv_pvn_force(SV* sv, STRLEN* lp)
5325 =item sv_pvn_force_flags
5326 X<sv_pvn_force_flags>
5328 Get a sensible string out of the SV somehow.
5329 If C<flags> has C<SV_GMAGIC> bit set, will C<mg_get> on C<sv> if
5330 appropriate, else not. C<sv_pvn_force> and C<sv_pvn_force_nomg> are
5331 implemented in terms of this function.
5332 You normally want to use the various wrapper macros instead: see
5333 C<SvPV_force> and C<SvPV_force_nomg>
5335 char* sv_pvn_force_flags(SV* sv, STRLEN* lp, I32 flags)
5340 =item sv_pvutf8n_force
5343 The backend for the C<SvPVutf8x_force> macro. Always use the macro instead.
5345 char* sv_pvutf8n_force(SV* sv, STRLEN* lp)
5353 Returns a string describing what the SV is a reference to.
5355 char* sv_reftype(const SV* sv, int ob)
5363 Make the first argument a copy of the second, then delete the original.
5364 The target SV physically takes over ownership of the body of the source SV
5365 and inherits its flags; however, the target keeps any magic it owns,
5366 and any magic in the source is discarded.
5367 Note that this is a rather specialist SV copying operation; most of the
5368 time you'll want to use C<sv_setsv> or one of its many macro front-ends.
5370 void sv_replace(SV* sv, SV* nsv)
5378 Underlying implementation for the C<reset> Perl function.
5379 Note that the perl-level function is vaguely deprecated.
5381 void sv_reset(const char* s, HV* stash)
5389 Weaken a reference: set the C<SvWEAKREF> flag on this RV; give the
5390 referred-to SV C<PERL_MAGIC_backref> magic if it hasn't already; and
5391 push a back-reference to this RV onto the array of backreferences
5392 associated with that magic.
5394 SV* sv_rvweaken(SV *sv)
5402 Copies an integer into the given SV, upgrading first if necessary.
5403 Does not handle 'set' magic. See also C<sv_setiv_mg>.
5405 void sv_setiv(SV* sv, IV num)
5413 Like C<sv_setiv>, but also handles 'set' magic.
5415 void sv_setiv_mg(SV *sv, IV i)
5423 Copies a double into the given SV, upgrading first if necessary.
5424 Does not handle 'set' magic. See also C<sv_setnv_mg>.
5426 void sv_setnv(SV* sv, NV num)
5434 Like C<sv_setnv>, but also handles 'set' magic.
5436 void sv_setnv_mg(SV *sv, NV num)
5444 Copies a string into an SV. The string must be null-terminated. Does not
5445 handle 'set' magic. See C<sv_setpv_mg>.
5447 void sv_setpv(SV* sv, const char* ptr)
5455 Works like C<sv_catpvf> but copies the text into the SV instead of
5456 appending it. Does not handle 'set' magic. See C<sv_setpvf_mg>.
5458 void sv_setpvf(SV* sv, const char* pat, ...)
5466 Like C<sv_setpvf>, but also handles 'set' magic.
5468 void sv_setpvf_mg(SV *sv, const char* pat, ...)
5476 Copies an integer into the given SV, also updating its string value.
5477 Does not handle 'set' magic. See C<sv_setpviv_mg>.
5479 void sv_setpviv(SV* sv, IV num)
5487 Like C<sv_setpviv>, but also handles 'set' magic.
5489 void sv_setpviv_mg(SV *sv, IV iv)
5497 Copies a string into an SV. The C<len> parameter indicates the number of
5498 bytes to be copied. If the C<ptr> argument is NULL the SV will become
5499 undefined. Does not handle 'set' magic. See C<sv_setpvn_mg>.
5501 void sv_setpvn(SV* sv, const char* ptr, STRLEN len)
5509 Like C<sv_setpvn>, but also handles 'set' magic.
5511 void sv_setpvn_mg(SV *sv, const char *ptr, STRLEN len)
5519 Like C<sv_setpv>, but also handles 'set' magic.
5521 void sv_setpv_mg(SV *sv, const char *ptr)
5529 Copies an integer into a new SV, optionally blessing the SV. The C<rv>
5530 argument will be upgraded to an RV. That RV will be modified to point to
5531 the new SV. The C<classname> argument indicates the package for the
5532 blessing. Set C<classname> to C<NULL> to avoid the blessing. The new SV
5533 will have a reference count of 1, and the RV will be returned.
5535 SV* sv_setref_iv(SV* rv, const char* classname, IV iv)
5543 Copies a double into a new SV, optionally blessing the SV. The C<rv>
5544 argument will be upgraded to an RV. That RV will be modified to point to
5545 the new SV. The C<classname> argument indicates the package for the
5546 blessing. Set C<classname> to C<NULL> to avoid the blessing. The new SV
5547 will have a reference count of 1, and the RV will be returned.
5549 SV* sv_setref_nv(SV* rv, const char* classname, NV nv)
5557 Copies a pointer into a new SV, optionally blessing the SV. The C<rv>
5558 argument will be upgraded to an RV. That RV will be modified to point to
5559 the new SV. If the C<pv> argument is NULL then C<PL_sv_undef> will be placed
5560 into the SV. The C<classname> argument indicates the package for the
5561 blessing. Set C<classname> to C<NULL> to avoid the blessing. The new SV
5562 will have a reference count of 1, and the RV will be returned.
5564 Do not use with other Perl types such as HV, AV, SV, CV, because those
5565 objects will become corrupted by the pointer copy process.
5567 Note that C<sv_setref_pvn> copies the string while this copies the pointer.
5569 SV* sv_setref_pv(SV* rv, const char* classname, void* pv)
5577 Copies a string into a new SV, optionally blessing the SV. The length of the
5578 string must be specified with C<n>. The C<rv> argument will be upgraded to
5579 an RV. That RV will be modified to point to the new SV. The C<classname>
5580 argument indicates the package for the blessing. Set C<classname> to
5581 C<NULL> to avoid the blessing. The new SV will have a reference count
5582 of 1, and the RV will be returned.
5584 Note that C<sv_setref_pv> copies the pointer while this copies the string.
5586 SV* sv_setref_pvn(SV* rv, const char* classname, const char* pv, STRLEN n)
5594 Copies an unsigned integer into a new SV, optionally blessing the SV. The C<rv>
5595 argument will be upgraded to an RV. That RV will be modified to point to
5596 the new SV. The C<classname> argument indicates the package for the
5597 blessing. Set C<classname> to C<NULL> to avoid the blessing. The new SV
5598 will have a reference count of 1, and the RV will be returned.
5600 SV* sv_setref_uv(SV* rv, const char* classname, UV uv)
5608 Copies the contents of the source SV C<ssv> into the destination SV
5609 C<dsv>. The source SV may be destroyed if it is mortal, so don't use this
5610 function if the source SV needs to be reused. Does not handle 'set' magic.
5611 Loosely speaking, it performs a copy-by-value, obliterating any previous
5612 content of the destination.
5614 You probably want to use one of the assortment of wrappers, such as
5615 C<SvSetSV>, C<SvSetSV_nosteal>, C<SvSetMagicSV> and
5616 C<SvSetMagicSV_nosteal>.
5618 void sv_setsv(SV* dsv, SV* ssv)
5623 =item sv_setsv_flags
5626 Copies the contents of the source SV C<ssv> into the destination SV
5627 C<dsv>. The source SV may be destroyed if it is mortal, so don't use this
5628 function if the source SV needs to be reused. Does not handle 'set' magic.
5629 Loosely speaking, it performs a copy-by-value, obliterating any previous
5630 content of the destination.
5631 If the C<flags> parameter has the C<SV_GMAGIC> bit set, will C<mg_get> on
5632 C<ssv> if appropriate, else not. If the C<flags> parameter has the
5633 C<NOSTEAL> bit set then the buffers of temps will not be stolen. <sv_setsv>
5634 and C<sv_setsv_nomg> are implemented in terms of this function.
5636 You probably want to use one of the assortment of wrappers, such as
5637 C<SvSetSV>, C<SvSetSV_nosteal>, C<SvSetMagicSV> and
5638 C<SvSetMagicSV_nosteal>.
5640 This is the primary function for copying scalars, and most other
5641 copy-ish functions and macros use this underneath.
5643 void sv_setsv_flags(SV* dsv, SV* ssv, I32 flags)
5651 Like C<sv_setsv>, but also handles 'set' magic.
5653 void sv_setsv_mg(SV *dstr, SV *sstr)
5661 Copies an unsigned integer into the given SV, upgrading first if necessary.
5662 Does not handle 'set' magic. See also C<sv_setuv_mg>.
5664 void sv_setuv(SV* sv, UV num)
5672 Like C<sv_setuv>, but also handles 'set' magic.
5674 void sv_setuv_mg(SV *sv, UV u)
5682 Test an SV for taintedness. Use C<SvTAINTED> instead.
5683 bool sv_tainted(SV* sv)
5691 Returns true if the SV has a true value by Perl's rules.
5692 Use the C<SvTRUE> macro instead, which may call C<sv_true()> or may
5693 instead use an in-line version.
5703 Removes all magic of type C<type> from an SV.
5705 int sv_unmagic(SV* sv, int type)
5710 =item sv_unref_flags
5713 Unsets the RV status of the SV, and decrements the reference count of
5714 whatever was being referenced by the RV. This can almost be thought of
5715 as a reversal of C<newSVrv>. The C<cflags> argument can contain
5716 C<SV_IMMEDIATE_UNREF> to force the reference count to be decremented
5717 (otherwise the decrementing is conditional on the reference count being
5718 different from one or the reference being a readonly SV).
5721 void sv_unref_flags(SV* sv, U32 flags)
5729 Untaint an SV. Use C<SvTAINTED_off> instead.
5730 void sv_untaint(SV* sv)
5738 Upgrade an SV to a more complex form. Generally adds a new body type to the
5739 SV, then copies across as much information as possible from the old body.
5740 You generally want to use the C<SvUPGRADE> macro wrapper. See also C<svtype>.
5742 void sv_upgrade(SV* sv, U32 mt)
5747 =item sv_usepvn_flags
5750 Tells an SV to use C<ptr> to find its string value. Normally the
5751 string is stored inside the SV but sv_usepvn allows the SV to use an
5752 outside string. The C<ptr> should point to memory that was allocated
5753 by C<malloc>. The string length, C<len>, must be supplied. By default
5754 this function will realloc (i.e. move) the memory pointed to by C<ptr>,
5755 so that pointer should not be freed or used by the programmer after
5756 giving it to sv_usepvn, and neither should any pointers from "behind"
5757 that pointer (e.g. ptr + 1) be used.
5759 If C<flags> & SV_SMAGIC is true, will call SvSETMAGIC. If C<flags> &
5760 SV_HAS_TRAILING_NUL is true, then C<ptr[len]> must be NUL, and the realloc
5761 will be skipped. (i.e. the buffer is actually at least 1 byte longer than
5762 C<len>, and already meets the requirements for storing in C<SvPVX>)
5764 void sv_usepvn_flags(SV* sv, char* ptr, STRLEN len, U32 flags)
5769 =item sv_utf8_decode
5772 If the PV of the SV is an octet sequence in UTF-8
5773 and contains a multiple-byte character, the C<SvUTF8> flag is turned on
5774 so that it looks like a character. If the PV contains only single-byte
5775 characters, the C<SvUTF8> flag stays being off.
5776 Scans PV for validity and returns false if the PV is invalid UTF-8.
5778 NOTE: this function is experimental and may change or be
5779 removed without notice.
5781 bool sv_utf8_decode(SV *sv)
5786 =item sv_utf8_downgrade
5787 X<sv_utf8_downgrade>
5789 Attempts to convert the PV of an SV from characters to bytes.
5790 If the PV contains a character beyond byte, this conversion will fail;
5791 in this case, either returns false or, if C<fail_ok> is not
5794 This is not as a general purpose Unicode to byte encoding interface:
5795 use the Encode extension for that.
5797 NOTE: this function is experimental and may change or be
5798 removed without notice.
5800 bool sv_utf8_downgrade(SV *sv, bool fail_ok)
5805 =item sv_utf8_encode
5808 Converts the PV of an SV to UTF-8, but then turns the C<SvUTF8>
5809 flag off so that it looks like octets again.
5811 void sv_utf8_encode(SV *sv)
5816 =item sv_utf8_upgrade
5819 Converts the PV of an SV to its UTF-8-encoded form.
5820 Forces the SV to string form if it is not already.
5821 Always sets the SvUTF8 flag to avoid future validity checks even
5822 if all the bytes have hibit clear.
5824 This is not as a general purpose byte encoding to Unicode interface:
5825 use the Encode extension for that.
5827 STRLEN sv_utf8_upgrade(SV *sv)
5832 =item sv_utf8_upgrade_flags
5833 X<sv_utf8_upgrade_flags>
5835 Converts the PV of an SV to its UTF-8-encoded form.
5836 Forces the SV to string form if it is not already.
5837 Always sets the SvUTF8 flag to avoid future validity checks even
5838 if all the bytes have hibit clear. If C<flags> has C<SV_GMAGIC> bit set,
5839 will C<mg_get> on C<sv> if appropriate, else not. C<sv_utf8_upgrade> and
5840 C<sv_utf8_upgrade_nomg> are implemented in terms of this function.
5842 This is not as a general purpose byte encoding to Unicode interface:
5843 use the Encode extension for that.
5845 STRLEN sv_utf8_upgrade_flags(SV *sv, I32 flags)
5853 Processes its arguments like C<vsprintf> and appends the formatted output
5854 to an SV. Does not handle 'set' magic. See C<sv_vcatpvf_mg>.
5856 Usually used via its frontend C<sv_catpvf>.
5858 void sv_vcatpvf(SV* sv, const char* pat, va_list* args)
5866 Processes its arguments like C<vsprintf> and appends the formatted output
5867 to an SV. Uses an array of SVs if the C style variable argument list is
5868 missing (NULL). When running with taint checks enabled, indicates via
5869 C<maybe_tainted> if results are untrustworthy (often due to the use of
5872 Usually used via one of its frontends C<sv_vcatpvf> and C<sv_vcatpvf_mg>.
5874 void sv_vcatpvfn(SV* sv, const char* pat, STRLEN patlen, va_list* args, SV** svargs, I32 svmax, bool *maybe_tainted)
5882 Like C<sv_vcatpvf>, but also handles 'set' magic.
5884 Usually used via its frontend C<sv_catpvf_mg>.
5886 void sv_vcatpvf_mg(SV* sv, const char* pat, va_list* args)
5894 Works like C<sv_vcatpvf> but copies the text into the SV instead of
5895 appending it. Does not handle 'set' magic. See C<sv_vsetpvf_mg>.
5897 Usually used via its frontend C<sv_setpvf>.
5899 void sv_vsetpvf(SV* sv, const char* pat, va_list* args)
5907 Works like C<sv_vcatpvfn> but copies the text into the SV instead of
5910 Usually used via one of its frontends C<sv_vsetpvf> and C<sv_vsetpvf_mg>.
5912 void sv_vsetpvfn(SV* sv, const char* pat, STRLEN patlen, va_list* args, SV** svargs, I32 svmax, bool *maybe_tainted)
5920 Like C<sv_vsetpvf>, but also handles 'set' magic.
5922 Usually used via its frontend C<sv_setpvf_mg>.
5924 void sv_vsetpvf_mg(SV* sv, const char* pat, va_list* args)
5932 =head1 Unicode Support
5936 =item bytes_from_utf8
5939 Converts a string C<s> of length C<len> from UTF-8 into byte encoding.
5940 Unlike C<utf8_to_bytes> but like C<bytes_to_utf8>, returns a pointer to
5941 the newly-created string, and updates C<len> to contain the new
5942 length. Returns the original string if no conversion occurs, C<len>
5943 is unchanged. Do nothing if C<is_utf8> points to 0. Sets C<is_utf8> to
5944 0 if C<s> is converted or contains all 7bit characters.
5946 NOTE: this function is experimental and may change or be
5947 removed without notice.
5949 U8* bytes_from_utf8(const U8 *s, STRLEN *len, bool *is_utf8)
5952 Found in file utf8.c
5957 Converts a string C<s> of length C<len> from ASCII into UTF-8 encoding.
5958 Returns a pointer to the newly-created string, and sets C<len> to
5959 reflect the new length.
5961 If you want to convert to UTF-8 from other encodings than ASCII,
5962 see sv_recode_to_utf8().
5964 NOTE: this function is experimental and may change or be
5965 removed without notice.
5967 U8* bytes_to_utf8(const U8 *s, STRLEN *len)
5970 Found in file utf8.c
5975 Return true if the strings s1 and s2 differ case-insensitively, false
5976 if not (if they are equal case-insensitively). If u1 is true, the
5977 string s1 is assumed to be in UTF-8-encoded Unicode. If u2 is true,
5978 the string s2 is assumed to be in UTF-8-encoded Unicode. If u1 or u2
5979 are false, the respective string is assumed to be in native 8-bit
5982 If the pe1 and pe2 are non-NULL, the scanning pointers will be copied
5983 in there (they will point at the beginning of the I<next> character).
5984 If the pointers behind pe1 or pe2 are non-NULL, they are the end
5985 pointers beyond which scanning will not continue under any
5986 circumstances. If the byte lengths l1 and l2 are non-zero, s1+l1 and
5987 s2+l2 will be used as goal end pointers that will also stop the scan,
5988 and which qualify towards defining a successful match: all the scans
5989 that define an explicit length must reach their goal pointers for
5990 a match to succeed).
5992 For case-insensitiveness, the "casefolding" of Unicode is used
5993 instead of upper/lowercasing both the characters, see
5994 http://www.unicode.org/unicode/reports/tr21/ (Case Mappings).
5996 I32 ibcmp_utf8(const char* a, char **pe1, UV l1, bool u1, const char* b, char **pe2, UV l2, bool u2)
5999 Found in file utf8.c
6004 Tests if some arbitrary number of bytes begins in a valid UTF-8
6005 character. Note that an INVARIANT (i.e. ASCII) character is a valid
6006 UTF-8 character. The actual number of bytes in the UTF-8 character
6007 will be returned if it is valid, otherwise 0.
6009 STRLEN is_utf8_char(const U8 *p)
6012 Found in file utf8.c
6014 =item is_utf8_string
6017 Returns true if first C<len> bytes of the given string form a valid
6018 UTF-8 string, false otherwise. Note that 'a valid UTF-8 string' does
6019 not mean 'a string that contains code points above 0x7F encoded in UTF-8'
6020 because a valid ASCII string is a valid UTF-8 string.
6022 See also is_utf8_string_loclen() and is_utf8_string_loc().
6024 bool is_utf8_string(const U8 *s, STRLEN len)
6027 Found in file utf8.c
6029 =item is_utf8_string_loc
6030 X<is_utf8_string_loc>
6032 Like is_utf8_string() but stores the location of the failure (in the
6033 case of "utf8ness failure") or the location s+len (in the case of
6034 "utf8ness success") in the C<ep>.
6036 See also is_utf8_string_loclen() and is_utf8_string().
6038 bool is_utf8_string_loc(const U8 *s, STRLEN len, const U8 **p)
6041 Found in file utf8.c
6043 =item is_utf8_string_loclen
6044 X<is_utf8_string_loclen>
6046 Like is_utf8_string() but stores the location of the failure (in the
6047 case of "utf8ness failure") or the location s+len (in the case of
6048 "utf8ness success") in the C<ep>, and the number of UTF-8
6049 encoded characters in the C<el>.
6051 See also is_utf8_string_loc() and is_utf8_string().
6053 bool is_utf8_string_loclen(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el)
6056 Found in file utf8.c
6058 =item pv_uni_display
6061 Build to the scalar dsv a displayable version of the string spv,
6062 length len, the displayable version being at most pvlim bytes long
6063 (if longer, the rest is truncated and "..." will be appended).
6065 The flags argument can have UNI_DISPLAY_ISPRINT set to display
6066 isPRINT()able characters as themselves, UNI_DISPLAY_BACKSLASH
6067 to display the \\[nrfta\\] as the backslashed versions (like '\n')
6068 (UNI_DISPLAY_BACKSLASH is preferred over UNI_DISPLAY_ISPRINT for \\).
6069 UNI_DISPLAY_QQ (and its alias UNI_DISPLAY_REGEX) have both
6070 UNI_DISPLAY_BACKSLASH and UNI_DISPLAY_ISPRINT turned on.
6072 The pointer to the PV of the dsv is returned.
6074 char* pv_uni_display(SV *dsv, const U8 *spv, STRLEN len, STRLEN pvlim, UV flags)
6077 Found in file utf8.c
6082 The encoding is assumed to be an Encode object, the PV of the ssv is
6083 assumed to be octets in that encoding and decoding the input starts
6084 from the position which (PV + *offset) pointed to. The dsv will be
6085 concatenated the decoded UTF-8 string from ssv. Decoding will terminate
6086 when the string tstr appears in decoding output or the input ends on
6087 the PV of the ssv. The value which the offset points will be modified
6088 to the last input position on the ssv.
6090 Returns TRUE if the terminator was found, else returns FALSE.
6092 bool sv_cat_decode(SV* dsv, SV *encoding, SV *ssv, int *offset, char* tstr, int tlen)
6097 =item sv_recode_to_utf8
6098 X<sv_recode_to_utf8>
6100 The encoding is assumed to be an Encode object, on entry the PV
6101 of the sv is assumed to be octets in that encoding, and the sv
6102 will be converted into Unicode (and UTF-8).
6104 If the sv already is UTF-8 (or if it is not POK), or if the encoding
6105 is not a reference, nothing is done to the sv. If the encoding is not
6106 an C<Encode::XS> Encoding object, bad things will happen.
6107 (See F<lib/encoding.pm> and L<Encode>).
6109 The PV of the sv is returned.
6111 char* sv_recode_to_utf8(SV* sv, SV *encoding)
6116 =item sv_uni_display
6119 Build to the scalar dsv a displayable version of the scalar sv,
6120 the displayable version being at most pvlim bytes long
6121 (if longer, the rest is truncated and "..." will be appended).
6123 The flags argument is as in pv_uni_display().
6125 The pointer to the PV of the dsv is returned.
6127 char* sv_uni_display(SV *dsv, SV *ssv, STRLEN pvlim, UV flags)
6130 Found in file utf8.c
6135 The "p" contains the pointer to the UTF-8 string encoding
6136 the character that is being converted.
6138 The "ustrp" is a pointer to the character buffer to put the
6139 conversion result to. The "lenp" is a pointer to the length
6142 The "swashp" is a pointer to the swash to use.
6144 Both the special and normal mappings are stored lib/unicore/To/Foo.pl,
6145 and loaded by SWASHNEW, using lib/utf8_heavy.pl. The special (usually,
6146 but not always, a multicharacter mapping), is tried first.
6148 The "special" is a string like "utf8::ToSpecLower", which means the
6149 hash %utf8::ToSpecLower. The access to the hash is through
6150 Perl_to_utf8_case().
6152 The "normal" is a string like "ToLower" which means the swash
6155 UV to_utf8_case(const U8 *p, U8* ustrp, STRLEN *lenp, SV **swashp, const char *normal, const char *special)
6158 Found in file utf8.c
6163 Convert the UTF-8 encoded character at p to its foldcase version and
6164 store that in UTF-8 in ustrp and its length in bytes in lenp. Note
6165 that the ustrp needs to be at least UTF8_MAXBYTES_CASE+1 bytes since the
6166 foldcase version may be longer than the original character (up to
6169 The first character of the foldcased version is returned
6170 (but note, as explained above, that there may be more.)
6172 UV to_utf8_fold(const U8 *p, U8* ustrp, STRLEN *lenp)
6175 Found in file utf8.c
6180 Convert the UTF-8 encoded character at p to its lowercase version and
6181 store that in UTF-8 in ustrp and its length in bytes in lenp. Note
6182 that the ustrp needs to be at least UTF8_MAXBYTES_CASE+1 bytes since the
6183 lowercase version may be longer than the original character.
6185 The first character of the lowercased version is returned
6186 (but note, as explained above, that there may be more.)
6188 UV to_utf8_lower(const U8 *p, U8* ustrp, STRLEN *lenp)
6191 Found in file utf8.c
6196 Convert the UTF-8 encoded character at p to its titlecase version and
6197 store that in UTF-8 in ustrp and its length in bytes in lenp. Note
6198 that the ustrp needs to be at least UTF8_MAXBYTES_CASE+1 bytes since the
6199 titlecase version may be longer than the original character.
6201 The first character of the titlecased version is returned
6202 (but note, as explained above, that there may be more.)
6204 UV to_utf8_title(const U8 *p, U8* ustrp, STRLEN *lenp)
6207 Found in file utf8.c
6212 Convert the UTF-8 encoded character at p to its uppercase version and
6213 store that in UTF-8 in ustrp and its length in bytes in lenp. Note
6214 that the ustrp needs to be at least UTF8_MAXBYTES_CASE+1 bytes since
6215 the uppercase version may be longer than the original character.
6217 The first character of the uppercased version is returned
6218 (but note, as explained above, that there may be more.)
6220 UV to_utf8_upper(const U8 *p, U8* ustrp, STRLEN *lenp)
6223 Found in file utf8.c
6225 =item utf8n_to_uvchr
6230 Returns the native character value of the first character in the string
6232 which is assumed to be in UTF-8 encoding; C<retlen> will be set to the
6233 length, in bytes, of that character.
6235 Allows length and flags to be passed to low level routine.
6237 UV utf8n_to_uvchr(const U8 *s, STRLEN curlen, STRLEN *retlen, U32 flags)
6240 Found in file utf8.c
6242 =item utf8n_to_uvuni
6245 Bottom level UTF-8 decode routine.
6246 Returns the unicode code point value of the first character in the string C<s>
6247 which is assumed to be in UTF-8 encoding and no longer than C<curlen>;
6248 C<retlen> will be set to the length, in bytes, of that character.
6250 If C<s> does not point to a well-formed UTF-8 character, the behaviour
6251 is dependent on the value of C<flags>: if it contains UTF8_CHECK_ONLY,
6252 it is assumed that the caller will raise a warning, and this function
6253 will silently just set C<retlen> to C<-1> and return zero. If the
6254 C<flags> does not contain UTF8_CHECK_ONLY, warnings about
6255 malformations will be given, C<retlen> will be set to the expected
6256 length of the UTF-8 character in bytes, and zero will be returned.
6258 The C<flags> can also contain various flags to allow deviations from
6259 the strict UTF-8 encoding (see F<utf8.h>).
6261 Most code should use utf8_to_uvchr() rather than call this directly.
6263 UV utf8n_to_uvuni(const U8 *s, STRLEN curlen, STRLEN *retlen, U32 flags)
6266 Found in file utf8.c
6271 Returns the number of UTF-8 characters between the UTF-8 pointers C<a>
6274 WARNING: use only if you *know* that the pointers point inside the
6277 IV utf8_distance(const U8 *a, const U8 *b)
6280 Found in file utf8.c
6285 Return the UTF-8 pointer C<s> displaced by C<off> characters, either
6286 forward or backward.
6288 WARNING: do not use the following unless you *know* C<off> is within
6289 the UTF-8 data pointed to by C<s> *and* that on entry C<s> is aligned
6290 on the first byte of character or just after the last byte of a character.
6292 U8* utf8_hop(const U8 *s, I32 off)
6295 Found in file utf8.c
6300 Return the length of the UTF-8 char encoded string C<s> in characters.
6301 Stops at C<e> (inclusive). If C<e E<lt> s> or if the scan would end
6302 up past C<e>, croaks.
6304 STRLEN utf8_length(const U8* s, const U8 *e)
6307 Found in file utf8.c
6312 Converts a string C<s> of length C<len> from UTF-8 into byte encoding.
6313 Unlike C<bytes_to_utf8>, this over-writes the original string, and
6314 updates len to contain the new length.
6315 Returns zero on failure, setting C<len> to -1.
6317 NOTE: this function is experimental and may change or be
6318 removed without notice.
6320 U8* utf8_to_bytes(U8 *s, STRLEN *len)
6323 Found in file utf8.c
6328 Returns the native character value of the first character in the string C<s>
6329 which is assumed to be in UTF-8 encoding; C<retlen> will be set to the
6330 length, in bytes, of that character.
6332 If C<s> does not point to a well-formed UTF-8 character, zero is
6333 returned and retlen is set, if possible, to -1.
6335 UV utf8_to_uvchr(const U8 *s, STRLEN *retlen)
6338 Found in file utf8.c
6343 Returns the Unicode code point of the first character in the string C<s>
6344 which is assumed to be in UTF-8 encoding; C<retlen> will be set to the
6345 length, in bytes, of that character.
6347 This function should only be used when returned UV is considered
6348 an index into the Unicode semantic tables (e.g. swashes).
6350 If C<s> does not point to a well-formed UTF-8 character, zero is
6351 returned and retlen is set, if possible, to -1.
6353 UV utf8_to_uvuni(const U8 *s, STRLEN *retlen)
6356 Found in file utf8.c
6361 Adds the UTF-8 representation of the Native codepoint C<uv> to the end
6362 of the string C<d>; C<d> should be have at least C<UTF8_MAXBYTES+1> free
6363 bytes available. The return value is the pointer to the byte after the
6364 end of the new character. In other words,
6366 d = uvchr_to_utf8(d, uv);
6368 is the recommended wide native character-aware way of saying
6372 U8* uvchr_to_utf8(U8 *d, UV uv)
6375 Found in file utf8.c
6377 =item uvuni_to_utf8_flags
6378 X<uvuni_to_utf8_flags>
6380 Adds the UTF-8 representation of the Unicode codepoint C<uv> to the end
6381 of the string C<d>; C<d> should be have at least C<UTF8_MAXBYTES+1> free
6382 bytes available. The return value is the pointer to the byte after the
6383 end of the new character. In other words,
6385 d = uvuni_to_utf8_flags(d, uv, flags);
6389 d = uvuni_to_utf8(d, uv);
6391 (which is equivalent to)
6393 d = uvuni_to_utf8_flags(d, uv, 0);
6395 is the recommended Unicode-aware way of saying
6399 U8* uvuni_to_utf8_flags(U8 *d, UV uv, UV flags)
6402 Found in file utf8.c
6407 =head1 Variables created by C<xsubpp> and C<xsubpp> internal functions
6414 Variable which is setup by C<xsubpp> to indicate the stack base offset,
6415 used by the C<ST>, C<XSprePUSH> and C<XSRETURN> macros. The C<dMARK> macro
6416 must be called prior to setup the C<MARK> variable.
6421 Found in file XSUB.h
6426 Variable which is setup by C<xsubpp> to indicate the
6427 class name for a C++ XS constructor. This is always a C<char*>. See C<THIS>.
6432 Found in file XSUB.h
6437 Sets up the C<ax> variable.
6438 This is usually handled automatically by C<xsubpp> by calling C<dXSARGS>.
6443 Found in file XSUB.h
6448 Sets up the C<ax> variable and stack marker variable C<mark>.
6449 This is usually handled automatically by C<xsubpp> by calling C<dXSARGS>.
6454 Found in file XSUB.h
6459 Sets up the C<items> variable.
6460 This is usually handled automatically by C<xsubpp> by calling C<dXSARGS>.
6465 Found in file XSUB.h
6470 Sets up the C<padoff_du> variable for an XSUB that wishes to use
6476 Found in file XSUB.h
6481 Sets up stack and mark pointers for an XSUB, calling dSP and dMARK.
6482 Sets up the C<ax> and C<items> variables by calling C<dAX> and C<dITEMS>.
6483 This is usually handled automatically by C<xsubpp>.
6488 Found in file XSUB.h
6493 Sets up the C<ix> variable for an XSUB which has aliases. This is usually
6494 handled automatically by C<xsubpp>.
6499 Found in file XSUB.h
6504 Variable which is setup by C<xsubpp> to indicate the number of
6505 items on the stack. See L<perlxs/"Variable-length Parameter Lists">.
6510 Found in file XSUB.h
6515 Variable which is setup by C<xsubpp> to indicate which of an
6516 XSUB's aliases was used to invoke it. See L<perlxs/"The ALIAS: Keyword">.
6521 Found in file XSUB.h
6526 Used by C<xsubpp> to hook up XSUBs as Perl subs. Adds Perl prototypes to
6530 Found in file XSUB.h
6535 Variable which is setup by C<xsubpp> to hold the return value for an
6536 XSUB. This is always the proper type for the XSUB. See
6537 L<perlxs/"The RETVAL Variable">.
6542 Found in file XSUB.h
6547 Used to access elements on the XSUB's stack.
6552 Found in file XSUB.h
6557 Variable which is setup by C<xsubpp> to designate the object in a C++
6558 XSUB. This is always the proper type for the C++ object. See C<CLASS> and
6559 L<perlxs/"Using XS With C++">.
6564 Found in file XSUB.h
6569 The SV* corresponding to the $_ variable. Works even if there
6570 is a lexical $_ in scope.
6573 Found in file XSUB.h
6578 Macro to declare an XSUB and its C parameter list. This is handled by
6582 Found in file XSUB.h
6587 The version identifier for an XS module. This is usually
6588 handled automatically by C<ExtUtils::MakeMaker>. See C<XS_VERSION_BOOTCHECK>.
6591 Found in file XSUB.h
6593 =item XS_VERSION_BOOTCHECK
6594 X<XS_VERSION_BOOTCHECK>
6596 Macro to verify that a PM module's $VERSION variable matches the XS
6597 module's C<XS_VERSION> variable. This is usually handled automatically by
6598 C<xsubpp>. See L<perlxs/"The VERSIONCHECK: Keyword">.
6600 XS_VERSION_BOOTCHECK;
6603 Found in file XSUB.h
6608 =head1 Warning and Dieing
6615 This is the XSUB-writer's interface to Perl's C<die> function.
6616 Normally call this function the same way you call the C C<printf>
6617 function. Calling C<croak> returns control directly to Perl,
6618 sidestepping the normal C order of execution. See C<warn>.
6620 If you want to throw an exception object, assign the object to
6621 C<$@> and then pass C<NULL> to croak():
6623 errsv = get_sv("@", TRUE);
6624 sv_setsv(errsv, exception_object);
6627 void croak(const char* pat, ...)
6630 Found in file util.c
6635 This is the XSUB-writer's interface to Perl's C<warn> function. Call this
6636 function the same way you call the C C<printf> function. See C<croak>.
6638 void warn(const char* pat, ...)
6641 Found in file util.c
6648 Until May 1997, this document was maintained by Jeff Okamoto
6649 <okamoto@corp.hp.com>. It is now maintained as part of Perl itself.
6651 With lots of help and suggestions from Dean Roehrich, Malcolm Beattie,
6652 Andreas Koenig, Paul Hudson, Ilya Zakharevich, Paul Marquess, Neil
6653 Bowers, Matthew Green, Tim Bunce, Spider Boardman, Ulrich Pfeifer,
6654 Stephen McCamant, and Gurusamy Sarathy.
6656 API Listing originally by Dean Roehrich <roehrich@cray.com>.
6658 Updated to be autogenerated from comments in the source by Benjamin Stuhl.
6662 perlguts(1), perlxs(1), perlxstut(1), perlintern(1)
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