Query: perlapi
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PERLAPI(1) Perl Programmers Reference Guide PERLAPI(1)NAMEperlapi - autogenerated documentation for the perl public APIDESCRIPTIONThis file contains the documentation of the perl public API generated by embed.pl, specifically a listing of functions, macros, flags, and variables that may be used by extension writers. The interfaces of any functions that are not listed here are subject to change without notice. For this reason, blindly using functions listed in proto.h is to be avoided when writing extensions. Note that all Perl API global variables must be referenced with the "PL_" prefix. Some macros are provided for compatibility with the older, unadorned names, but this support may be disabled in a future release. The listing is alphabetical, case insensitive. "Gimme" Values GIMME A backward-compatible version of "GIMME_V" which can only return "G_SCALAR" or "G_ARRAY"; in a void context, it returns "G_SCALAR". Deprecated. Use "GIMME_V" instead. U32 GIMME GIMME_V The XSUB-writer's equivalent to Perl's "wantarray". Returns "G_VOID", "G_SCALAR" or "G_ARRAY" for void, scalar or list context, respectively. U32 GIMME_V G_ARRAY Used to indicate list context. See "GIMME_V", "GIMME" and perlcall. G_DISCARD Indicates that arguments returned from a callback should be discarded. See perlcall. G_EVAL Used to force a Perl "eval" wrapper around a callback. See perlcall. G_NOARGS Indicates that no arguments are being sent to a callback. See perlcall. G_SCALAR Used to indicate scalar context. See "GIMME_V", "GIMME", and perlcall. G_VOID Used to indicate void context. See "GIMME_V" and perlcall. Array Manipulation Functions AvFILL Same as "av_len()". Deprecated, use "av_len()" instead. int AvFILL(AV* av) av_clear Clears an array, making it empty. Does not free the memory used by the array itself. void av_clear(AV* ar) av_create_and_push Push an SV onto the end of the array, creating the array if necessary. A small internal helper function to remove a commonly duplicated idiom. NOTE: this function is experimental and may change or be removed without notice. void av_create_and_push(AV **const avp, SV *const val) av_create_and_unshift_one Unshifts an SV onto the beginning of the array, creating the array if necessary. A small internal helper function to remove a com- monly duplicated idiom. NOTE: this function is experimental and may change or be removed without notice. SV** av_create_and_unshift_one(AV **const avp, SV *const val) av_delete Deletes the element indexed by "key" from the array. Returns the deleted element. If "flags" equals "G_DISCARD", the element is freed and null is returned. SV* av_delete(AV* ar, I32 key, I32 flags) av_exists Returns true if the element indexed by "key" has been initialized. This relies on the fact that uninitialized array elements are set to &PL_sv_undef. bool av_exists(AV* ar, I32 key) av_extend Pre-extend an array. The "key" is the index to which the array should be extended. void av_extend(AV* ar, I32 key) av_fetch Returns the SV at the specified index in the array. The "key" is the index. If "lval" is set then the fetch will be part of a store. Check that the return value is non-null before dereferencing it to a "SV*". See "Understanding the Magic of Tied Hashes and Arrays" in perlguts for more information on how to use this function on tied arrays. SV** av_fetch(AV* ar, I32 key, I32 lval) av_fill Set the highest index in the array to the given number, equivalent to Perl's "$#array = $fill;". The number of elements in the an array will be "fill + 1" after av_fill() returns. If the array was previously shorter then the additional elements appended are set to "PL_sv_undef". If the array was longer, then the excess elements are freed. "av_fill(av, -1)" is the same as "av_clear(av)". void av_fill(AV* ar, I32 fill) av_len Returns the highest index in the array. The number of elements in the array is "av_len(av) + 1". Returns -1 if the array is empty. I32 av_len(AV* ar) av_make Creates a new AV and populates it with a list of SVs. The SVs are copied into the array, so they may be freed after the call to av_make. The new AV will have a reference count of 1. AV* av_make(I32 size, SV** svp) av_pop Pops an SV off the end of the array. Returns &PL_sv_undef if the array is empty. SV* av_pop(AV* ar) av_push Pushes an SV onto the end of the array. The array will grow automatically to accommodate the addition. void av_push(AV* ar, SV* val) av_shift Shifts an SV off the beginning of the array. Returns &PL_sv_undef if the array is empty. SV* av_shift(AV* ar) av_store Stores an SV in an array. The array index is specified as "key". The return value will be NULL if the operation failed or if the value did not need to be actually stored within the array (as in the case of tied arrays). Otherwise it can be dereferenced to get the original "SV*". Note that the caller is responsible for suitably incrementing the reference count of "val" before the call, and decrementing it if the function returned NULL. See "Understanding the Magic of Tied Hashes and Arrays" in perlguts for more information on how to use this function on tied arrays. SV** av_store(AV* ar, I32 key, SV* val) av_undef Undefines the array. Frees the memory used by the array itself. void av_undef(AV* ar) av_unshift Unshift the given number of "undef" values onto the beginning of the array. The array will grow automatically to accommodate the addition. You must then use "av_store" to assign values to these new elements. void av_unshift(AV* ar, I32 num) get_av Returns the AV of the specified Perl array. If "create" is set and the Perl variable does not exist then it will be created. If "create" is not set and the variable does not exist then NULL is returned. NOTE: the perl_ form of this function is deprecated. AV* get_av(const char* name, I32 create) newAV Creates a new AV. The reference count is set to 1. AV* newAV() sortsv Sort an array. Here is an example: sortsv(AvARRAY(av), av_len(av)+1, Perl_sv_cmp_locale); See lib/sort.pm for details about controlling the sorting algorithm. void sortsv(SV** array, size_t num_elts, SVCOMPARE_t cmp) Callback Functions call_argv Performs a callback to the specified Perl sub. See perlcall. NOTE: the perl_ form of this function is deprecated. I32 call_argv(const char* sub_name, I32 flags, char** argv) call_method Performs a callback to the specified Perl method. The blessed object must be on the stack. See perlcall. NOTE: the perl_ form of this function is deprecated. I32 call_method(const char* methname, I32 flags) call_pv Performs a callback to the specified Perl sub. See perlcall. NOTE: the perl_ form of this function is deprecated. I32 call_pv(const char* sub_name, I32 flags) call_sv Performs a callback to the Perl sub whose name is in the SV. See perlcall. NOTE: the perl_ form of this function is deprecated. I32 call_sv(SV* sv, VOL I32 flags) ENTER Opening bracket on a callback. See "LEAVE" and perlcall. ENTER; eval_pv Tells Perl to "eval" the given string and return an SV* result. NOTE: the perl_ form of this function is deprecated. SV* eval_pv(const char* p, I32 croak_on_error) eval_sv Tells Perl to "eval" the string in the SV. NOTE: the perl_ form of this function is deprecated. I32 eval_sv(SV* sv, I32 flags) FREETMPS Closing bracket for temporaries on a callback. See "SAVETMPS" and perlcall. FREETMPS; LEAVE Closing bracket on a callback. See "ENTER" and perlcall. LEAVE; SAVETMPS Opening bracket for temporaries on a callback. See "FREETMPS" and perlcall. SAVETMPS; Character classes isALNUM Returns a boolean indicating whether the C "char" is an ASCII alphanumeric character (including underscore) or digit. bool isALNUM(char ch) isALPHA Returns a boolean indicating whether the C "char" is an ASCII alphabetic character. bool isALPHA(char ch) isDIGIT Returns a boolean indicating whether the C "char" is an ASCII digit. bool isDIGIT(char ch) isLOWER Returns a boolean indicating whether the C "char" is a lowercase character. bool isLOWER(char ch) isSPACE Returns a boolean indicating whether the C "char" is whitespace. bool isSPACE(char ch) isUPPER Returns a boolean indicating whether the C "char" is an uppercase character. bool isUPPER(char ch) toLOWER Converts the specified character to lowercase. char toLOWER(char ch) toUPPER Converts the specified character to uppercase. char toUPPER(char ch) Cloning an interpreter perl_clone Create and return a new interpreter by cloning the current one. perl_clone takes these flags as parameters: CLONEf_COPY_STACKS - is used to, well, copy the stacks also, without it we only clone the data and zero the stacks, with it we copy the stacks and the new perl interpreter is ready to run at the exact same point as the previous one. The pseudo-fork code uses COPY_STACKS while the threads->create doesn't. CLONEf_KEEP_PTR_TABLE perl_clone keeps a ptr_table with the pointer of the old variable as a key and the new variable as a value, this allows it to check if something has been cloned and not clone it again but rather just use the value and increase the ref- count. If KEEP_PTR_TABLE is not set then perl_clone will kill the ptr_table using the function "ptr_table_free(PL_ptr_table); PL_ptr_table = NULL;", reason to keep it around is if you want to dup some of your own variable who are outside the graph perl scans, example of this code is in threads.xs create CLONEf_CLONE_HOST This is a win32 thing, it is ignored on unix, it tells perls win32host code (which is c++) to clone itself, this is needed on win32 if you want to run two threads at the same time, if you just want to do some stuff in a separate perl inter- preter and then throw it away and return to the original one, you don't need to do anything. PerlInterpreter* perl_clone(PerlInterpreter* interp, UV flags) CV Manipulation Functions CvSTASH Returns the stash of the CV. HV* CvSTASH(CV* cv) get_cv Uses "strlen" to get the length of "name", then calls "get_cvn_flags". NOTE: the perl_ form of this function is deprecated. CV* get_cv(const char* name, I32 flags) get_cvn_flags Returns the CV of the specified Perl subroutine. "flags" are passed to "gv_fetchpvn_flags". If "GV_ADD" is set and the Perl sub- routine does not exist then it will be declared (which has the same effect as saying "sub name;"). If "GV_ADD" is not set and the subroutine does not exist then NULL is returned. NOTE: the perl_ form of this function is deprecated. CV* get_cvn_flags(const char* name, STRLEN len, I32 flags) Embedding Functions cv_undef Clear out all the active components of a CV. This can happen either by an explicit "undef &foo", or by the reference count going to zero. In the former case, we keep the CvOUTSIDE pointer, so that any anonymous children can still follow the full lexical scope chain. void cv_undef(CV* cv) load_module Loads the module whose name is pointed to by the string part of name. Note that the actual module name, not its filename, should be given. Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOAD- MOD_IMPORT_OPS (or 0 for no flags). ver, if specified, provides version semantics similar to "use Foo::Bar VERSION". The optional trailing SV* arguments can be used to specify arguments to the module's import() method, similar to "use Foo::Bar VERSION LIST". void load_module(U32 flags, SV* name, SV* ver, ...) nothreadhook Stub that provides thread hook for perl_destruct when there are no threads. int nothreadhook() perl_alloc Allocates a new Perl interpreter. See perlembed. PerlInterpreter* perl_alloc() perl_construct Initializes a new Perl interpreter. See perlembed. void perl_construct(PerlInterpreter* interp) perl_destruct Shuts down a Perl interpreter. See perlembed. int perl_destruct(PerlInterpreter* interp) perl_free Releases a Perl interpreter. See perlembed. void perl_free(PerlInterpreter* interp) perl_parse Tells a Perl interpreter to parse a Perl script. See perlembed. int perl_parse(PerlInterpreter* interp, XSINIT_t xsinit, int argc, char** argv, char** env) perl_run Tells a Perl interpreter to run. See perlembed. int perl_run(PerlInterpreter* interp) require_pv Tells Perl to "require" the file named by the string argument. It is analogous to the Perl code "eval "require '$file'"". It's even implemented that way; consider using load_module instead. NOTE: the perl_ form of this function is deprecated. void require_pv(const char* pv) Functions in file dump.c pv_display Similar to pv_escape(dsv,pv,cur,pvlim,PERL_PV_ESCAPE_QUOTE); except that an additional " " will be appended to the string when len > cur and pv[cur] is " ". Note that the final string may be up to 7 chars longer than pvlim. char* pv_display(SV *dsv, char *pv, STRLEN cur, STRLEN len, STRLEN pvlim) pv_escape Escapes at most the first "count" chars of pv and puts the results into dsv such that the size of the escaped string will not exceed "max" chars and will not contain any incomplete escape sequences. If flags contains PERL_PV_ESCAPE_QUOTE then any double quotes in the string will also be escaped. Normally the SV will be cleared before the escaped string is prepared, but when PERL_PV_ESCAPE_NOCLEAR is set this will not occur. If PERL_PV_ESCAPE_UNI is set then the input string is treated as Unicode, if PERL_PV_ESCAPE_UNI_DETECT is set then the input string is scanned using "is_utf8_string()" to determine if it is Unicode. If PERL_PV_ESCAPE_ALL is set then all input chars will be output using "x01F1" style escapes, otherwise only chars above 255 will be escaped using this style, other non printable chars will use octal or common escaped patterns like " ". If PERL_PV_ESCAPE_NOBACKSLASH then all chars below 255 will be treated as printable and will be output as literals. If PERL_PV_ESCAPE_FIRSTCHAR is set then only the first char of the string will be escaped, regardles of max. If the string is utf8 and the chars value is >255 then it will be returned as a plain hex sequence. Thus the output will either be a single char, an octal escape sequence, a special escape like " " or a 3 or more digit hex value. Returns a pointer to the escaped text as held by dsv. char* pv_escape(SV *dsv, char const * const str, const STRLEN count, const STRLEN max, STRLEN * const escaped, const U32 flags) pv_pretty Converts a string into something presentable, handling escaping via pv_escape() and supporting quoting and elipses. If the PERL_PV_PRETTY_QUOTE flag is set then the result will be double quoted with any double quotes in the string escaped. Other- wise if the PERL_PV_PRETTY_LTGT flag is set then the result be wrapped in angle brackets. If the PERL_PV_PRETTY_ELIPSES flag is set and not all characters in string were output then an elipses "..." will be appended to the string. Note that this happens AFTER it has been quoted. If start_color is non-null then it will be inserted after the opening quote (if there is one) but before the escaped text. If end_color is non-null then it will be inserted after the escaped text but before any quotes or elipses. Returns a pointer to the prettified text as held by dsv. char* pv_pretty(SV *dsv, char const * const str, const STRLEN count, const STRLEN max, char const * const start_color, char const * const end_color, const U32 flags) Functions in file mathoms.c gv_fetchmethod See gv_fetchmethod_autoload. GV* gv_fetchmethod(HV* stash, const char* name) pack_cat The engine implementing pack() Perl function. Note: parameters next_in_list and flags are not used. This call should not be used; use packlist instead. void pack_cat(SV *cat, char *pat, char *patend, SV **beglist, SV **endlist, SV ***next_in_list, U32 flags) sv_2pvbyte_nolen Return a pointer to the byte-encoded representation of the SV. May cause the SV to be downgraded from UTF-8 as a side-effect. Usually accessed via the "SvPVbyte_nolen" macro. char* sv_2pvbyte_nolen(SV* sv) sv_2pvutf8_nolen Return a pointer to the UTF-8-encoded representation of the SV. May cause the SV to be upgraded to UTF-8 as a side-effect. Usually accessed via the "SvPVutf8_nolen" macro. char* sv_2pvutf8_nolen(SV* sv) sv_2pv_nolen Like "sv_2pv()", but doesn't return the length too. You should usually use the macro wrapper "SvPV_nolen(sv)" instead. char* sv_2pv_nolen(SV* sv) sv_catpvn_mg Like "sv_catpvn", but also handles 'set' magic. void sv_catpvn_mg(SV *sv, const char *ptr, STRLEN len) sv_catsv_mg Like "sv_catsv", but also handles 'set' magic. void sv_catsv_mg(SV *dstr, SV *sstr) sv_force_normal Undo various types of fakery on an SV: if the PV is a shared string, make a private copy; if we're a ref, stop refing; if we're a glob, downgrade to an xpvmg. See also "sv_force_normal_flags". void sv_force_normal(SV *sv) sv_iv A private implementation of the "SvIVx" macro for compilers which can't cope with complex macro expressions. Always use the macro instead. IV sv_iv(SV* sv) sv_nolocking Dummy routine which "locks" an SV when there is no locking module present. Exists to avoid test for a NULL function pointer and because it could potentially warn under some level of strict-ness. "Superseded" by sv_nosharing(). void sv_nolocking(SV *sv) sv_nounlocking Dummy routine which "unlocks" an SV when there is no locking module present. Exists to avoid test for a NULL function pointer and because it could potentially warn under some level of strict-ness. "Superseded" by sv_nosharing(). void sv_nounlocking(SV *sv) sv_nv A private implementation of the "SvNVx" macro for compilers which can't cope with complex macro expressions. Always use the macro instead. NV sv_nv(SV* sv) sv_pv Use the "SvPV_nolen" macro instead char* sv_pv(SV *sv) sv_pvbyte Use "SvPVbyte_nolen" instead. char* sv_pvbyte(SV *sv) sv_pvbyten A private implementation of the "SvPVbyte" macro for compilers which can't cope with complex macro expressions. Always use the macro instead. char* sv_pvbyten(SV *sv, STRLEN *len) sv_pvn A private implementation of the "SvPV" macro for compilers which can't cope with complex macro expressions. Always use the macro instead. char* sv_pvn(SV *sv, STRLEN *len) sv_pvutf8 Use the "SvPVutf8_nolen" macro instead char* sv_pvutf8(SV *sv) sv_pvutf8n A private implementation of the "SvPVutf8" macro for compilers which can't cope with complex macro expressions. Always use the macro instead. char* sv_pvutf8n(SV *sv, STRLEN *len) sv_taint Taint an SV. Use "SvTAINTED_on" instead. void sv_taint(SV* sv) sv_unref Unsets the RV status of the SV, and decrements the reference count of whatever was being referenced by the RV. This can almost be thought of as a reversal of "newSVrv". This is "sv_unref_flags" with the "flag" being zero. See "SvROK_off". void sv_unref(SV* sv) sv_usepvn Tells an SV to use "ptr" to find its string value. Implemented by calling "sv_usepvn_flags" with "flags" of 0, hence does not han- dle 'set' magic. See "sv_usepvn_flags". void sv_usepvn(SV* sv, char* ptr, STRLEN len) sv_usepvn_mg Like "sv_usepvn", but also handles 'set' magic. void sv_usepvn_mg(SV *sv, char *ptr, STRLEN len) sv_uv A private implementation of the "SvUVx" macro for compilers which can't cope with complex macro expressions. Always use the macro instead. UV sv_uv(SV* sv) unpack_str The engine implementing unpack() Perl function. Note: parameters strbeg, new_s and ocnt are not used. This call should not be used, use unpackstring instead. I32 unpack_str(char *pat, char *patend, char *s, char *strbeg, char *strend, char **new_s, I32 ocnt, U32 flags) Functions in file pp_ctl.c find_runcv Locate the CV corresponding to the currently executing sub or eval. If db_seqp is non_null, skip CVs that are in the DB package and populate *db_seqp with the cop sequence number at the point that the DB:: code was entered. (allows debuggers to eval in the scope of the breakpoint rather than in the scope of the debugger itself). CV* find_runcv(U32 *db_seqp) Functions in file pp_pack.c packlist The engine implementing pack() Perl function. void packlist(SV *cat, char *pat, char *patend, SV **beglist, SV **endlist) unpackstring The engine implementing unpack() Perl function. "unpackstring" puts the extracted list items on the stack and returns the number of elements. Issue "PUTBACK" before and "SPAGAIN" after the call to this function. I32 unpackstring(char *pat, char *patend, char *s, char *strend, U32 flags) Global Variables PL_modglobal "PL_modglobal" is a general purpose, interpreter global HV for use by extensions that need to keep information on a per-interpreter basis. In a pinch, it can also be used as a symbol table for extensions to share data among each other. It is a good idea to use keys prefixed by the package name of the extension that owns the data. HV* PL_modglobal PL_na A convenience variable which is typically used with "SvPV" when one doesn't care about the length of the string. It is usually more efficient to either declare a local variable and use that instead or to use the "SvPV_nolen" macro. STRLEN PL_na PL_sv_no This is the "false" SV. See "PL_sv_yes". Always refer to this as &PL_sv_no. SV PL_sv_no PL_sv_undef This is the "undef" SV. Always refer to this as &PL_sv_undef. SV PL_sv_undef PL_sv_yes This is the "true" SV. See "PL_sv_no". Always refer to this as &PL_sv_yes. SV PL_sv_yes GV Functions GvSV Return the SV from the GV. SV* GvSV(GV* gv) gv_const_sv If "gv" is a typeglob whose subroutine entry is a constant sub eligible for inlining, or "gv" is a placeholder reference that would be promoted to such a typeglob, then returns the value returned by the sub. Otherwise, returns NULL. SV* gv_const_sv(GV* gv) gv_fetchmeth Returns the glob with the given "name" and a defined subroutine or "NULL". The glob lives in the given "stash", or in the stashes accessible via @ISA and UNIVERSAL::. The argument "level" should be either 0 or -1. If "level==0", as a side-effect creates a glob with the given "name" in the given "stash" which in the case of success contains an alias for the subroutine, and sets up caching info for this glob. Similarly for all the searched stashes. This function grants "SUPER" token as a postfix of the stash name. The GV returned from "gv_fetchmeth" may be a method cache entry, which is not visible to Perl code. So when calling "call_sv", you should not use the GV directly; instead, you should use the method's CV, which can be obtained from the GV with the "GvCV" macro. GV* gv_fetchmeth(HV* stash, const char* name, STRLEN len, I32 level) gv_fetchmethod_autoload Returns the glob which contains the subroutine to call to invoke the method on the "stash". In fact in the presence of autoloading this may be the glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is already setup. The third parameter of "gv_fetchmethod_autoload" determines whether AUTOLOAD lookup is performed if the given method is not present: non-zero means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD. Calling "gv_fetchmethod" is equivalent to calling "gv_fetchmethod_autoload" with a non-zero "autoload" parameter. These functions grant "SUPER" token as a prefix of the method name. Note that if you want to keep the returned glob for a long time, you need to check for it being "AUTOLOAD", since at the later time the call may load a different subroutine due to $AUTOLOAD changing its value. Use the glob created via a side effect to do this. These functions have the same side-effects and as "gv_fetchmeth" with "level==0". "name" should be writable if contains ':' or "' ''". The warning against passing the GV returned by "gv_fetchmeth" to "call_sv" apply equally to these functions. GV* gv_fetchmethod_autoload(HV* stash, const char* name, I32 autoload) gv_fetchmeth_autoload Same as gv_fetchmeth(), but looks for autoloaded subroutines too. Returns a glob for the subroutine. For an autoloaded subroutine without a GV, will create a GV even if "level < 0". For an autoloaded subroutine without a stub, GvCV() of the result may be zero. GV* gv_fetchmeth_autoload(HV* stash, const char* name, STRLEN len, I32 level) gv_stashpv Returns a pointer to the stash for a specified package. Uses "strlen" to determine the length of "name", then calls "gv_stash- pvn()". HV* gv_stashpv(const char* name, I32 flags) gv_stashpvn Returns a pointer to the stash for a specified package. The "namelen" parameter indicates the length of the "name", in bytes. "flags" is passed to "gv_fetchpvn_flags()", so if set to "GV_ADD" then the package will be created if it does not already exist. If the package does not exist and "flags" is 0 (or any other setting that does not create packages) then NULL is returned. HV* gv_stashpvn(const char* name, U32 namelen, I32 flags) gv_stashpvs Like "gv_stashpvn", but takes a literal string instead of a string/length pair. HV* gv_stashpvs(const char* name, I32 create) gv_stashsv Returns a pointer to the stash for a specified package. See "gv_stashpvn". HV* gv_stashsv(SV* sv, I32 flags) Handy Values Nullav Null AV pointer. Nullch Null character pointer. Nullcv Null CV pointer. Nullhv Null HV pointer. Nullsv Null SV pointer. Hash Manipulation Functions get_hv Returns the HV of the specified Perl hash. If "create" is set and the Perl variable does not exist then it will be created. If "create" is not set and the variable does not exist then NULL is returned. NOTE: the perl_ form of this function is deprecated. HV* get_hv(const char* name, I32 create) HEf_SVKEY This flag, used in the length slot of hash entries and magic structures, specifies the structure contains an "SV*" pointer where a "char*" pointer is to be expected. (For information only--not to be used). HeHASH Returns the computed hash stored in the hash entry. U32 HeHASH(HE* he) HeKEY Returns the actual pointer stored in the key slot of the hash entry. The pointer may be either "char*" or "SV*", depending on the value of "HeKLEN()". Can be assigned to. The "HePV()" or "HeSVKEY()" macros are usually preferable for finding the value of a key. void* HeKEY(HE* he) HeKLEN If this is negative, and amounts to "HEf_SVKEY", it indicates the entry holds an "SV*" key. Otherwise, holds the actual length of the key. Can be assigned to. The "HePV()" macro is usually preferable for finding key lengths. STRLEN HeKLEN(HE* he) HePV Returns the key slot of the hash entry as a "char*" value, doing any necessary dereferencing of possibly "SV*" keys. The length of the string is placed in "len" (this is a macro, so do not use &len). If you do not care about what the length of the key is, you may use the global variable "PL_na", though this is rather less efficient than using a local variable. Remember though, that hash keys in perl are free to contain embedded nulls, so using "strlen()" or similar is not a good way to find the length of hash keys. This is very similar to the "SvPV()" macro described elsewhere in this document. See also "HeUTF8". If you are using "HePV" to get values to pass to "newSVpvn()" to create a new SV, you should consider using "newSVhek(HeKEY_hek(he))" as it is more efficient. char* HePV(HE* he, STRLEN len) HeSVKEY Returns the key as an "SV*", or "NULL" if the hash entry does not contain an "SV*" key. SV* HeSVKEY(HE* he) HeSVKEY_force Returns the key as an "SV*". Will create and return a temporary mortal "SV*" if the hash entry contains only a "char*" key. SV* HeSVKEY_force(HE* he) HeSVKEY_set Sets the key to a given "SV*", taking care to set the appropriate flags to indicate the presence of an "SV*" key, and returns the same "SV*". SV* HeSVKEY_set(HE* he, SV* sv) HeUTF8 Returns whether the "char *" value returned by "HePV" is encoded in UTF-8, doing any necessary dereferencing of possibly "SV*" keys. The value returned will be 0 or non-0, not necessarily 1 (or even a value with any low bits set), so do not blindly assign this to a "bool" variable, as "bool" may be a typedef for "char". char* HeUTF8(HE* he, STRLEN len) HeVAL Returns the value slot (type "SV*") stored in the hash entry. SV* HeVAL(HE* he) HvNAME Returns the package name of a stash, or NULL if "stash" isn't a stash. See "SvSTASH", "CvSTASH". char* HvNAME(HV* stash) hv_assert Check that a hash is in an internally consistent state. void hv_assert(HV* tb) hv_clear Clears a hash, making it empty. void hv_clear(HV* tb) hv_clear_placeholders Clears any placeholders from a hash. If a restricted hash has any of its keys marked as readonly and the key is subsequently deleted, the key is not actually deleted but is marked by assigning it a value of &PL_sv_placeholder. This tags it so it will be ignored by future operations such as iterating over the hash, but will still allow the hash to have a value reassigned to the key at some future point. This function clears any such placeholder keys from the hash. See Hash::Util::lock_keys() for an example of its use. void hv_clear_placeholders(HV* hb) hv_delete Deletes a key/value pair in the hash. The value SV is removed from the hash and returned to the caller. The "klen" is the length of the key. The "flags" value will normally be zero; if set to G_DISCARD then NULL will be returned. SV* hv_delete(HV* tb, const char* key, I32 klen, I32 flags) hv_delete_ent Deletes a key/value pair in the hash. The value SV is removed from the hash and returned to the caller. The "flags" value will normally be zero; if set to G_DISCARD then NULL will be returned. "hash" can be a valid precomputed hash value, or 0 to ask for it to be computed. SV* hv_delete_ent(HV* tb, SV* key, I32 flags, U32 hash) hv_exists Returns a boolean indicating whether the specified hash key exists. The "klen" is the length of the key. bool hv_exists(HV* tb, const char* key, I32 klen) hv_exists_ent Returns a boolean indicating whether the specified hash key exists. "hash" can be a valid precomputed hash value, or 0 to ask for it to be computed. bool hv_exists_ent(HV* tb, SV* key, U32 hash) hv_fetch Returns the SV which corresponds to the specified key in the hash. The "klen" is the length of the key. If "lval" is set then the fetch will be part of a store. Check that the return value is non-null before dereferencing it to an "SV*". See "Understanding the Magic of Tied Hashes and Arrays" in perlguts for more information on how to use this function on tied hashes. SV** hv_fetch(HV* tb, const char* key, I32 klen, I32 lval) hv_fetchs Like "hv_fetch", but takes a literal string instead of a string/length pair. SV** hv_fetchs(HV* tb, const char* key, I32 lval) hv_fetch_ent Returns the hash entry which corresponds to the specified key in the hash. "hash" must be a valid precomputed hash number for the given "key", or 0 if you want the function to compute it. IF "lval" is set then the fetch will be part of a store. Make sure the return value is non-null before accessing it. The return value when "tb" is a tied hash is a pointer to a static location, so be sure to make a copy of the structure if you need to store it somewhere. See "Understanding the Magic of Tied Hashes and Arrays" in perlguts for more information on how to use this function on tied hashes. HE* hv_fetch_ent(HV* tb, SV* key, I32 lval, U32 hash) hv_iterinit Prepares a starting point to traverse a hash table. Returns the number of keys in the hash (i.e. the same as "HvKEYS(tb)"). The return value is currently only meaningful for hashes without tie magic. NOTE: Before version 5.004_65, "hv_iterinit" used to return the number of hash buckets that happen to be in use. If you still need that esoteric value, you can get it through the macro "HvFILL(tb)". I32 hv_iterinit(HV* tb) hv_iterkey Returns the key from the current position of the hash iterator. See "hv_iterinit". char* hv_iterkey(HE* entry, I32* retlen) hv_iterkeysv Returns the key as an "SV*" from the current position of the hash iterator. The return value will always be a mortal copy of the key. Also see "hv_iterinit". SV* hv_iterkeysv(HE* entry) hv_iternext Returns entries from a hash iterator. See "hv_iterinit". You may call "hv_delete" or "hv_delete_ent" on the hash entry that the iterator currently points to, without losing your place or invalidating your iterator. Note that in this case the current entry is deleted from the hash with your iterator holding the last reference to it. Your iterator is flagged to free the entry on the next call to "hv_iternext", so you must not discard your itera- tor immediately else the entry will leak - call "hv_iternext" to trigger the resource deallocation. HE* hv_iternext(HV* tb) hv_iternextsv Performs an "hv_iternext", "hv_iterkey", and "hv_iterval" in one operation. SV* hv_iternextsv(HV* hv, char** key, I32* retlen) hv_iternext_flags Returns entries from a hash iterator. See "hv_iterinit" and "hv_iternext". The "flags" value will normally be zero; if HV_ITERNEXT_WANTPLACEHOLDERS is set the placeholders keys (for restricted hashes) will be returned in addition to normal keys. By default placeholders are automatically skipped over. Currently a placeholder is implemented with a value that is &Perl_sv_place- holder. Note that the implementation of placeholders and restricted hashes may change, and the implementation currently is insuffi- ciently abstracted for any change to be tidy. NOTE: this function is experimental and may change or be removed without notice. HE* hv_iternext_flags(HV* tb, I32 flags) hv_iterval Returns the value from the current position of the hash iterator. See "hv_iterkey". SV* hv_iterval(HV* tb, HE* entry) hv_magic Adds magic to a hash. See "sv_magic". void hv_magic(HV* hv, GV* gv, int how) hv_scalar Evaluates the hash in scalar context and returns the result. Handles magic when the hash is tied. SV* hv_scalar(HV* hv) hv_store Stores an SV in a hash. The hash key is specified as "key" and "klen" is the length of the key. The "hash" parameter is the pre- computed hash value; if it is zero then Perl will compute it. The return value will be NULL if the operation failed or if the value did not need to be actually stored within the hash (as in the case of tied hashes). Otherwise it can be dereferenced to get the original "SV*". Note that the caller is responsible for suitably incrementing the reference count of "val" before the call, and decrementing it if the function returned NULL. Effectively a successful hv_store takes ownership of one reference to "val". This is usually what you want; a newly created SV has a reference count of one, so if all your code does is create SVs then store them in a hash, hv_store will own the only reference to the new SV, and your code doesn't need to do anything further to tidy up. hv_store is not implemented as a call to hv_store_ent, and does not create a temporary SV for the key, so if your key data is not already in SV form then use hv_store in preference to hv_store_ent. See "Understanding the Magic of Tied Hashes and Arrays" in perlguts for more information on how to use this function on tied hashes. SV** hv_store(HV* tb, const char* key, I32 klen, SV* val, U32 hash) hv_stores Like "hv_store", but takes a literal string instead of a string/length pair and omits the hash parameter. SV** hv_stores(HV* tb, const char* key, NULLOK SV* val) hv_store_ent Stores "val" in a hash. The hash key is specified as "key". The "hash" parameter is the precomputed hash value; if it is zero then Perl will compute it. The return value is the new hash entry so created. It will be NULL if the operation failed or if the value did not need to be actually stored within the hash (as in the case of tied hashes). Otherwise the contents of the return value can be accessed using the "He?" macros described here. Note that the caller is responsible for suitably incrementing the reference count of "val" before the call, and decrementing it if the function returned NULL. Effectively a successful hv_store_ent takes ownership of one reference to "val". This is usually what you want; a newly created SV has a reference count of one, so if all your code does is create SVs then store them in a hash, hv_store will own the only reference to the new SV, and your code doesn't need to do anything further to tidy up. Note that hv_store_ent only reads the "key"; unlike "val" it does not take owner- ship of it, so maintaining the correct reference count on "key" is entirely the caller's responsibility. hv_store is not imple- mented as a call to hv_store_ent, and does not create a temporary SV for the key, so if your key data is not already in SV form then use hv_store in preference to hv_store_ent. See "Understanding the Magic of Tied Hashes and Arrays" in perlguts for more information on how to use this function on tied hashes. HE* hv_store_ent(HV* tb, SV* key, SV* val, U32 hash) hv_undef Undefines the hash. void hv_undef(HV* tb) newHV Creates a new HV. The reference count is set to 1. HV* newHV() Magical Functions mg_clear Clear something magical that the SV represents. See "sv_magic". int mg_clear(SV* sv) mg_copy Copies the magic from one SV to another. See "sv_magic". int mg_copy(SV* sv, SV* nsv, const char* key, I32 klen) mg_find Finds the magic pointer for type matching the SV. See "sv_magic". MAGIC* mg_find(SV* sv, int type) mg_free Free any magic storage used by the SV. See "sv_magic". int mg_free(SV* sv) mg_get Do magic after a value is retrieved from the SV. See "sv_magic". int mg_get(SV* sv) mg_length Report on the SV's length. See "sv_magic". U32 mg_length(SV* sv) mg_magical Turns on the magical status of an SV. See "sv_magic". void mg_magical(SV* sv) mg_set Do magic after a value is assigned to the SV. See "sv_magic". int mg_set(SV* sv) SvGETMAGIC Invokes "mg_get" on an SV if it has 'get' magic. This macro evaluates its argument more than once. void SvGETMAGIC(SV* sv) SvLOCK Arranges for a mutual exclusion lock to be obtained on sv if a suitable module has been loaded. void SvLOCK(SV* sv) SvSETMAGIC Invokes "mg_set" on an SV if it has 'set' magic. This macro evaluates its argument more than once. void SvSETMAGIC(SV* sv) SvSetMagicSV Like "SvSetSV", but does any set magic required afterwards. void SvSetMagicSV(SV* dsb, SV* ssv) SvSetMagicSV_nosteal Like "SvSetSV_nosteal", but does any set magic required afterwards. void SvSetMagicSV_nosteal(SV* dsv, SV* ssv) SvSetSV Calls "sv_setsv" if dsv is not the same as ssv. May evaluate arguments more than once. void SvSetSV(SV* dsb, SV* ssv) SvSetSV_nosteal Calls a non-destructive version of "sv_setsv" if dsv is not the same as ssv. May evaluate arguments more than once. void SvSetSV_nosteal(SV* dsv, SV* ssv) SvSHARE Arranges for sv to be shared between threads if a suitable module has been loaded. void SvSHARE(SV* sv) SvUNLOCK Releases a mutual exclusion lock on sv if a suitable module has been loaded. void SvUNLOCK(SV* sv) Memory Management Copy The XSUB-writer's interface to the C "memcpy" function. The "src" is the source, "dest" is the destination, "nitems" is the number of items, and "type" is the type. May fail on overlapping copies. See also "Move". void Copy(void* src, void* dest, int nitems, type) CopyD Like "Copy" but returns dest. Useful for encouraging compilers to tail-call optimise. void * CopyD(void* src, void* dest, int nitems, type) Move The XSUB-writer's interface to the C "memmove" function. The "src" is the source, "dest" is the destination, "nitems" is the num- ber of items, and "type" is the type. Can do overlapping moves. See also "Copy". void Move(void* src, void* dest, int nitems, type) MoveD Like "Move" but returns dest. Useful for encouraging compilers to tail-call optimise. void * MoveD(void* src, void* dest, int nitems, type) Newx The XSUB-writer's interface to the C "malloc" function. In 5.9.3, Newx() and friends replace the older New() API, and drops the first parameter, x, a debug aid which allowed callers to identify themselves. This aid has been superseded by a new build option, PERL_MEM_LOG (see "PERL_MEM_LOG" in perlhack). The older API is still there for use in XS modules supporting older perls. void Newx(void* ptr, int nitems, type) Newxc The XSUB-writer's interface to the C "malloc" function, with cast. See also "Newx". void Newxc(void* ptr, int nitems, type, cast) Newxz The XSUB-writer's interface to the C "malloc" function. The allocated memory is zeroed with "memzero". See also "Newx". void Newxz(void* ptr, int nitems, type) Poison PoisonWith(0xEF) for catching access to freed memory. void Poison(void* dest, int nitems, type) PoisonFree PoisonWith(0xEF) for catching access to freed memory. void PoisonFree(void* dest, int nitems, type) PoisonNew PoisonWith(0xAB) for catching access to allocated but uninitialized memory. void PoisonNew(void* dest, int nitems, type) PoisonWith Fill up memory with a byte pattern (a byte repeated over and over again) that hopefully catches attempts to access uninitialized memory. void PoisonWith(void* dest, int nitems, type, U8 byte) Renew The XSUB-writer's interface to the C "realloc" function. void Renew(void* ptr, int nitems, type) Renewc The XSUB-writer's interface to the C "realloc" function, with cast. void Renewc(void* ptr, int nitems, type, cast) Safefree The XSUB-writer's interface to the C "free" function. void Safefree(void* ptr) savepv Perl's version of "strdup()". Returns a pointer to a newly allocated string which is a duplicate of "pv". The size of the string is determined by "strlen()". The memory allocated for the new string can be freed with the "Safefree()" function. char* savepv(const char* pv) savepvn Perl's version of what "strndup()" would be if it existed. Returns a pointer to a newly allocated string which is a duplicate of the first "len" bytes from "pv", plus a trailing NUL byte. The memory allocated for the new string can be freed with the "Safe- free()" function. char* savepvn(const char* pv, I32 len) savepvs Like "savepvn", but takes a literal string instead of a string/length pair. char* savepvs(const char* s) savesharedpv A version of "savepv()" which allocates the duplicate string in memory which is shared between threads. char* savesharedpv(const char* pv) savesharedpvn A version of "savepvn()" which allocates the duplicate string in memory which is shared between threads. (With the specific differ- ence that a NULL pointer is not acceptable) char* savesharedpvn(const char *const pv, const STRLEN len) savesvpv A version of "savepv()"/"savepvn()" which gets the string to duplicate from the passed in SV using "SvPV()" char* savesvpv(SV* sv) StructCopy This is an architecture-independent macro to copy one structure to another. void StructCopy(type src, type dest, type) Zero The XSUB-writer's interface to the C "memzero" function. The "dest" is the destination, "nitems" is the number of items, and "type" is the type. void Zero(void* dest, int nitems, type) ZeroD Like "Zero" but returns dest. Useful for encouraging compilers to tail-call optimise. void * ZeroD(void* dest, int nitems, type) Miscellaneous Functions fbm_compile Analyses the string in order to make fast searches on it using fbm_instr() -- the Boyer-Moore algorithm. void fbm_compile(SV* sv, U32 flags) fbm_instr Returns the location of the SV in the string delimited by "str" and "strend". It returns "NULL" if the string can't be found. The "sv" does not have to be fbm_compiled, but the search will not be as fast then. char* fbm_instr(unsigned char* big, unsigned char* bigend, SV* littlesv, U32 flags) form Takes a sprintf-style format pattern and conventional (non-SV) arguments and returns the formatted string. (char *) Perl_form(pTHX_ const char* pat, ...) can be used any place a string (char *) is required: char * s = Perl_form("%d.%d",major,minor); Uses a single private buffer so if you want to format several strings you must explicitly copy the earlier strings away (and free the copies when you are done). char* form(const char* pat, ...) getcwd_sv Fill the sv with current working directory int getcwd_sv(SV* sv) my_snprintf The C library "snprintf" functionality, if available and standards-compliant (uses "vsnprintf", actually). However, if the "vsnprintf" is not available, will unfortunately use the unsafe "vsprintf" which can overrun the buffer (there is an overrun check, but that may be too late). Consider using "sv_vcatpvf" instead, or getting "vsnprintf". int my_snprintf(char *buffer, const Size_t len, const char *format, ...) my_sprintf The C library "sprintf", wrapped if necessary, to ensure that it will return the length of the string written to the buffer. Only rare pre-ANSI systems need the wrapper function - usually this is a direct call to "sprintf". int my_sprintf(char *buffer, const char *pat, ...) my_vsnprintf The C library "vsnprintf" if available and standards-compliant. However, if if the "vsnprintf" is not available, will unfortu- nately use the unsafe "vsprintf" which can overrun the buffer (there is an overrun check, but that may be too late). Consider using "sv_vcatpvf" instead, or getting "vsnprintf". int my_vsnprintf(char *buffer, const Size_t len, const char *format, va_list ap) strEQ Test two strings to see if they are equal. Returns true or false. bool strEQ(char* s1, char* s2) strGE Test two strings to see if the first, "s1", is greater than or equal to the second, "s2". Returns true or false. bool strGE(char* s1, char* s2) strGT Test two strings to see if the first, "s1", is greater than the second, "s2". Returns true or false. bool strGT(char* s1, char* s2) strLE Test two strings to see if the first, "s1", is less than or equal to the second, "s2". Returns true or false. bool strLE(char* s1, char* s2) strLT Test two strings to see if the first, "s1", is less than the second, "s2". Returns true or false. bool strLT(char* s1, char* s2) strNE Test two strings to see if they are different. Returns true or false. bool strNE(char* s1, char* s2) strnEQ Test two strings to see if they are equal. The "len" parameter indicates the number of bytes to compare. Returns true or false. (A wrapper for "strncmp"). bool strnEQ(char* s1, char* s2, STRLEN len) strnNE Test two strings to see if they are different. The "len" parameter indicates the number of bytes to compare. Returns true or false. (A wrapper for "strncmp"). bool strnNE(char* s1, char* s2, STRLEN len) sv_destroyable Dummy routine which reports that object can be destroyed when there is no sharing module present. It ignores its single SV argu- ment, and returns 'true'. Exists to avoid test for a NULL function pointer and because it could potentially warn under some level of strict-ness. bool sv_destroyable(SV *sv) sv_nosharing Dummy routine which "shares" an SV when there is no sharing module present. Or "locks" it. Or "unlocks" it. In other words, ignores its single SV argument. Exists to avoid test for a NULL function pointer and because it could potentially warn under some level of strict-ness. void sv_nosharing(SV *sv) Multicall Functions dMULTICALL Declare local variables for a multicall. See "Lightweight Callbacks" in perlcall. dMULTICALL; MULTICALL Make a lightweight callback. See "Lightweight Callbacks" in perlcall. MULTICALL; POP_MULTICALL Closing bracket for a lightweight callback. See "Lightweight Callbacks" in perlcall. POP_MULTICALL; PUSH_MULTICALL Opening bracket for a lightweight callback. See "Lightweight Callbacks" in perlcall. PUSH_MULTICALL; Numeric functions grok_bin converts a string representing a binary number to numeric form. On entry start and *len give the string to scan, *flags gives conversion flags, and result should be NULL or a pointer to an NV. The scan stops at the end of the string, or the first invalid character. Unless "PERL_SCAN_SILENT_ILLDIGIT" is set in *flags, encountering an invalid character will also trigger a warning. On return *len is set to the length of the scanned string, and *flags gives output flags. If the value is <= "UV_MAX" it is returned as a UV, the output flags are clear, and nothing is written to *result. If the value is > UV_MAX "grok_bin" returns UV_MAX, sets "PERL_SCAN_GREATER_THAN_UV_MAX" in the output flags, and writes the value to *result (or the value is discarded if result is NULL). The binary number may optionally be prefixed with "0b" or "b" unless "PERL_SCAN_DISALLOW_PREFIX" is set in *flags on entry. If "PERL_SCAN_ALLOW_UNDERSCORES" is set in *flags then the binary number may use '_' characters to separate digits. UV grok_bin(char* start, STRLEN* len, I32* flags, NV *result) grok_hex converts a string representing a hex number to numeric form. On entry start and *len give the string to scan, *flags gives conversion flags, and result should be NULL or a pointer to an NV. The scan stops at the end of the string, or the first invalid character. Unless "PERL_SCAN_SILENT_ILLDIGIT" is set in *flags, encountering an invalid character will also trigger a warning. On return *len is set to the length of the scanned string, and *flags gives output flags. If the value is <= UV_MAX it is returned as a UV, the output flags are clear, and nothing is written to *result. If the value is > UV_MAX "grok_hex" returns UV_MAX, sets "PERL_SCAN_GREATER_THAN_UV_MAX" in the output flags, and writes the value to *result (or the value is discarded if result is NULL). The hex number may optionally be prefixed with "0x" or "x" unless "PERL_SCAN_DISALLOW_PREFIX" is set in *flags on entry. If "PERL_SCAN_ALLOW_UNDERSCORES" is set in *flags then the hex number may use '_' characters to separate digits. UV grok_hex(char* start, STRLEN* len, I32* flags, NV *result) grok_number Recognise (or not) a number. The type of the number is returned (0 if unrecognised), otherwise it is a bit-ORed combination of IS_NUMBER_IN_UV, IS_NUMBER_GREATER_THAN_UV_MAX, IS_NUMBER_NOT_INT, IS_NUMBER_NEG, IS_NUMBER_INFINITY, IS_NUMBER_NAN (defined in perl.h). If the value of the number can fit an in UV, it is returned in the *valuep IS_NUMBER_IN_UV will be set to indicate that *valuep is valid, IS_NUMBER_IN_UV will never be set unless *valuep is valid, but *valuep may have been assigned to during processing even though IS_NUMBER_IN_UV is not set on return. If valuep is NULL, IS_NUMBER_IN_UV will be set for the same cases as when valuep is non-NULL, but no actual assignment (or SEGV) will occur. IS_NUMBER_NOT_INT will be set with IS_NUMBER_IN_UV if trailing decimals were seen (in which case *valuep gives the true value trun- cated to an integer), and IS_NUMBER_NEG if the number is negative (in which case *valuep holds the absolute value). IS_NUM- BER_IN_UV is not set if e notation was used or the number is larger than a UV. int grok_number(const char *pv, STRLEN len, UV *valuep) grok_numeric_radix Scan and skip for a numeric decimal separator (radix). bool grok_numeric_radix(const char **sp, const char *send) grok_oct converts a string representing an octal number to numeric form. On entry start and *len give the string to scan, *flags gives conversion flags, and result should be NULL or a pointer to an NV. The scan stops at the end of the string, or the first invalid character. Unless "PERL_SCAN_SILENT_ILLDIGIT" is set in *flags, encountering an invalid character will also trigger a warning. On return *len is set to the length of the scanned string, and *flags gives output flags. If the value is <= UV_MAX it is returned as a UV, the output flags are clear, and nothing is written to *result. If the value is > UV_MAX "grok_oct" returns UV_MAX, sets "PERL_SCAN_GREATER_THAN_UV_MAX" in the output flags, and writes the value to *result (or the value is discarded if result is NULL). If "PERL_SCAN_ALLOW_UNDERSCORES" is set in *flags then the octal number may use '_' characters to separate digits. UV grok_oct(char* start, STRLEN* len_p, I32* flags, NV *result) Perl_signbit Return a non-zero integer if the sign bit on an NV is set, and 0 if it is not. If Configure detects this system has a signbit() that will work with our NVs, then we just use it via the #define in perl.h. Oth- erwise, fall back on this implementation. As a first pass, this gets everything right except -0.0. Alas, catching -0.0 is the main use for this function, so this is not too helpful yet. Still, at least we have the scaffolding in place to support other sys- tems, should that prove useful. Configure notes: This function is called 'Perl_signbit' instead of a plain 'signbit' because it is easy to imagine a system having a signbit() function or macro that doesn't happen to work with our particular choice of NVs. We shouldn't just re-#define signbit as Perl_signbit and expect the standard system headers to be happy. Also, this is a no-context function (no pTHX_) because Perl_signbit() is usually re-#defined in perl.h as a simple macro call to the system's signbit(). Users should just always call Perl_signbit(). NOTE: this function is experimental and may change or be removed without notice. int Perl_signbit(NV f) scan_bin For backwards compatibility. Use "grok_bin" instead. NV scan_bin(char* start, STRLEN len, STRLEN* retlen) scan_hex For backwards compatibility. Use "grok_hex" instead. NV scan_hex(char* start, STRLEN len, STRLEN* retlen) scan_oct For backwards compatibility. Use "grok_oct" instead. NV scan_oct(char* start, STRLEN len, STRLEN* retlen) Optree Manipulation Functions cv_const_sv If "cv" is a constant sub eligible for inlining. returns the constant value returned by the sub. Otherwise, returns NULL. Constant subs can be created with "newCONSTSUB" or as described in "Constant Functions" in perlsub. SV* cv_const_sv(CV* cv) newCONSTSUB Creates a constant sub equivalent to Perl "sub FOO () { 123 }" which is eligible for inlining at compile-time. CV* newCONSTSUB(HV* stash, char* name, SV* sv) newXS Used by "xsubpp" to hook up XSUBs as Perl subs. filename needs to be static storage, as it is used directly as CvFILE(), without a copy being made. Pad Data Structures pad_sv Get the value at offset po in the current pad. Use macro PAD_SV instead of calling this function directly. SV* pad_sv(PADOFFSET po) Simple Exception Handling Macros dXCPT Set up necessary local variables for exception handling. See "Exception Handling" in perlguts. dXCPT; XCPT_CATCH Introduces a catch block. See "Exception Handling" in perlguts. XCPT_RETHROW Rethrows a previously caught exception. See "Exception Handling" in perlguts. XCPT_RETHROW; XCPT_TRY_END Ends a try block. See "Exception Handling" in perlguts. XCPT_TRY_START Starts a try block. See "Exception Handling" in perlguts. Stack Manipulation Macros dMARK Declare a stack marker variable, "mark", for the XSUB. See "MARK" and "dORIGMARK". dMARK; dORIGMARK Saves the original stack mark for the XSUB. See "ORIGMARK". dORIGMARK; dSP Declares a local copy of perl's stack pointer for the XSUB, available via the "SP" macro. See "SP". dSP; EXTEND Used to extend the argument stack for an XSUB's return values. Once used, guarantees that there is room for at least "nitems" to be pushed onto the stack. void EXTEND(SP, int nitems) MARK Stack marker variable for the XSUB. See "dMARK". mPUSHi Push an integer onto the stack. The stack must have room for this element. Does not use "TARG". See also "PUSHi", "mXPUSHi" and "XPUSHi". void mPUSHi(IV iv) mPUSHn Push a double onto the stack. The stack must have room for this element. Does not use "TARG". See also "PUSHn", "mXPUSHn" and "XPUSHn". void mPUSHn(NV nv) mPUSHp Push a string onto the stack. The stack must have room for this element. The "len" indicates the length of the string. Does not use "TARG". See also "PUSHp", "mXPUSHp" and "XPUSHp". void mPUSHp(char* str, STRLEN len) mPUSHs Push an SV onto the stack and mortalizes the SV. The stack must have room for this element. Does not use "TARG". See also "PUSHs" and "mXPUSHs". void mPUSHs(SV* sv) mPUSHu Push an unsigned integer onto the stack. The stack must have room for this element. Does not use "TARG". See also "PUSHu", "mXPUSHu" and "XPUSHu". void mPUSHu(UV uv) mXPUSHi Push an integer onto the stack, extending the stack if necessary. Does not use "TARG". See also "XPUSHi", "mPUSHi" and "PUSHi". void mXPUSHi(IV iv) mXPUSHn Push a double onto the stack, extending the stack if necessary. Does not use "TARG". See also "XPUSHn", "mPUSHn" and "PUSHn". void mXPUSHn(NV nv) mXPUSHp Push a string onto the stack, extending the stack if necessary. The "len" indicates the length of the string. Does not use "TARG". See also "XPUSHp", "mPUSHp" and "PUSHp". void mXPUSHp(char* str, STRLEN len) mXPUSHs Push an SV onto the stack, extending the stack if necessary and mortalizes the SV. Does not use "TARG". See also "XPUSHs" and "mPUSHs". void mXPUSHs(SV* sv) mXPUSHu Push an unsigned integer onto the stack, extending the stack if necessary. Does not use "TARG". See also "XPUSHu", "mPUSHu" and "PUSHu". void mXPUSHu(UV uv) ORIGMARK The original stack mark for the XSUB. See "dORIGMARK". POPi Pops an integer off the stack. IV POPi POPl Pops a long off the stack. long POPl POPn Pops a double off the stack. NV POPn POPp Pops a string off the stack. Deprecated. New code should use POPpx. char* POPp POPpbytex Pops a string off the stack which must consist of bytes i.e. characters < 256. char* POPpbytex POPpx Pops a string off the stack. char* POPpx POPs Pops an SV off the stack. SV* POPs PUSHi Push an integer onto the stack. The stack must have room for this element. Handles 'set' magic. Uses "TARG", so "dTARGET" or "dXSTARG" should be called to declare it. Do not call multiple "TARG"-oriented macros to return lists from XSUB's - see "mPUSHi" instead. See also "XPUSHi" and "mXPUSHi". void PUSHi(IV iv) PUSHMARK Opening bracket for arguments on a callback. See "PUTBACK" and perlcall. void PUSHMARK(SP) PUSHmortal Push a new mortal SV onto the stack. The stack must have room for this element. Does not use "TARG". See also "PUSHs", "XPUSH- mortal" and "XPUSHs". void PUSHmortal() PUSHn Push a double onto the stack. The stack must have room for this element. Handles 'set' magic. Uses "TARG", so "dTARGET" or "dXS- TARG" should be called to declare it. Do not call multiple "TARG"-oriented macros to return lists from XSUB's - see "mPUSHn" instead. See also "XPUSHn" and "mXPUSHn". void PUSHn(NV nv) PUSHp Push a string onto the stack. The stack must have room for this element. The "len" indicates the length of the string. Handles 'set' magic. Uses "TARG", so "dTARGET" or "dXSTARG" should be called to declare it. Do not call multiple "TARG"-oriented macros to return lists from XSUB's - see "mPUSHp" instead. See also "XPUSHp" and "mXPUSHp". void PUSHp(char* str, STRLEN len) PUSHs Push an SV onto the stack. The stack must have room for this element. Does not handle 'set' magic. Does not use "TARG". See also "PUSHmortal", "XPUSHs" and "XPUSHmortal". void PUSHs(SV* sv) PUSHu Push an unsigned integer onto the stack. The stack must have room for this element. Handles 'set' magic. Uses "TARG", so "dTAR- GET" or "dXSTARG" should be called to declare it. Do not call multiple "TARG"-oriented macros to return lists from XSUB's - see "mPUSHu" instead. See also "XPUSHu" and "mXPUSHu". void PUSHu(UV uv) PUTBACK Closing bracket for XSUB arguments. This is usually handled by "xsubpp". See "PUSHMARK" and perlcall for other uses. PUTBACK; SP Stack pointer. This is usually handled by "xsubpp". See "dSP" and "SPAGAIN". SPAGAIN Refetch the stack pointer. Used after a callback. See perlcall. SPAGAIN; XPUSHi Push an integer onto the stack, extending the stack if necessary. Handles 'set' magic. Uses "TARG", so "dTARGET" or "dXSTARG" should be called to declare it. Do not call multiple "TARG"-oriented macros to return lists from XSUB's - see "mXPUSHi" instead. See also "PUSHi" and "mPUSHi". void XPUSHi(IV iv) XPUSHmortal Push a new mortal SV onto the stack, extending the stack if necessary. Does not use "TARG". See also "XPUSHs", "PUSHmortal" and "PUSHs". void XPUSHmortal() XPUSHn Push a double onto the stack, extending the stack if necessary. Handles 'set' magic. Uses "TARG", so "dTARGET" or "dXSTARG" should be called to declare it. Do not call multiple "TARG"-oriented macros to return lists from XSUB's - see "mXPUSHn" instead. See also "PUSHn" and "mPUSHn". void XPUSHn(NV nv) XPUSHp Push a string onto the stack, extending the stack if necessary. The "len" indicates the length of the string. Handles 'set' magic. Uses "TARG", so "dTARGET" or "dXSTARG" should be called to declare it. Do not call multiple "TARG"-oriented macros to return lists from XSUB's - see "mXPUSHp" instead. See also "PUSHp" and "mPUSHp". void XPUSHp(char* str, STRLEN len) XPUSHs Push an SV onto the stack, extending the stack if necessary. Does not handle 'set' magic. Does not use "TARG". See also "XPUSH- mortal", "PUSHs" and "PUSHmortal". void XPUSHs(SV* sv) XPUSHu Push an unsigned integer onto the stack, extending the stack if necessary. Handles 'set' magic. Uses "TARG", so "dTARGET" or "dXSTARG" should be called to declare it. Do not call multiple "TARG"-oriented macros to return lists from XSUB's - see "mXPUSHu" instead. See also "PUSHu" and "mPUSHu". void XPUSHu(UV uv) XSRETURN Return from XSUB, indicating number of items on the stack. This is usually handled by "xsubpp". void XSRETURN(int nitems) XSRETURN_EMPTY Return an empty list from an XSUB immediately. XSRETURN_EMPTY; XSRETURN_IV Return an integer from an XSUB immediately. Uses "XST_mIV". void XSRETURN_IV(IV iv) XSRETURN_NO Return &PL_sv_no from an XSUB immediately. Uses "XST_mNO". XSRETURN_NO; XSRETURN_NV Return a double from an XSUB immediately. Uses "XST_mNV". void XSRETURN_NV(NV nv) XSRETURN_PV Return a copy of a string from an XSUB immediately. Uses "XST_mPV". void XSRETURN_PV(char* str) XSRETURN_UNDEF Return &PL_sv_undef from an XSUB immediately. Uses "XST_mUNDEF". XSRETURN_UNDEF; XSRETURN_UV Return an integer from an XSUB immediately. Uses "XST_mUV". void XSRETURN_UV(IV uv) XSRETURN_YES Return &PL_sv_yes from an XSUB immediately. Uses "XST_mYES". XSRETURN_YES; XST_mIV Place an integer into the specified position "pos" on the stack. The value is stored in a new mortal SV. void XST_mIV(int pos, IV iv) XST_mNO Place &PL_sv_no into the specified position "pos" on the stack. void XST_mNO(int pos) XST_mNV Place a double into the specified position "pos" on the stack. The value is stored in a new mortal SV. void XST_mNV(int pos, NV nv) XST_mPV Place a copy of a string into the specified position "pos" on the stack. The value is stored in a new mortal SV. void XST_mPV(int pos, char* str) XST_mUNDEF Place &PL_sv_undef into the specified position "pos" on the stack. void XST_mUNDEF(int pos) XST_mYES Place &PL_sv_yes into the specified position "pos" on the stack. void XST_mYES(int pos) SV Flags svtype An enum of flags for Perl types. These are found in the file sv.h in the "svtype" enum. Test these flags with the "SvTYPE" macro. SVt_IV Integer type flag for scalars. See "svtype". SVt_NV Double type flag for scalars. See "svtype". SVt_PV Pointer type flag for scalars. See "svtype". SVt_PVAV Type flag for arrays. See "svtype". SVt_PVCV Type flag for code refs. See "svtype". SVt_PVHV Type flag for hashes. See "svtype". SVt_PVMG Type flag for blessed scalars. See "svtype". SV Manipulation Functions get_sv Returns the SV of the specified Perl scalar. If "create" is set and the Perl variable does not exist then it will be created. If "create" is not set and the variable does not exist then NULL is returned. NOTE: the perl_ form of this function is deprecated. SV* get_sv(const char* name, I32 create) newRV_inc Creates an RV wrapper for an SV. The reference count for the original SV is incremented. SV* newRV_inc(SV* sv) newSVpvn_utf8 Creates a new SV and copies a string into it. If utf8 is true, calls "SvUTF8_on" on the new SV. Implemented as a wrapper around "newSVpvn_flags". SV* newSVpvn_utf8(NULLOK const char* s, STRLEN len, U32 utf8) SvCUR Returns the length of the string which is in the SV. See "SvLEN". STRLEN SvCUR(SV* sv) SvCUR_set Set the current length of the string which is in the SV. See "SvCUR" and "SvIV_set". void SvCUR_set(SV* sv, STRLEN len) SvEND Returns a pointer to the last character in the string which is in the SV. See "SvCUR". Access the character as *(SvEND(sv)). char* SvEND(SV* sv) SvGROW Expands the character buffer in the SV so that it has room for the indicated number of bytes (remember to reserve space for an extra trailing NUL character). Calls "sv_grow" to perform the expansion if necessary. Returns a pointer to the character buffer. char * SvGROW(SV* sv, STRLEN len) SvIOK Returns a U32 value indicating whether the SV contains an integer. U32 SvIOK(SV* sv) SvIOKp Returns a U32 value indicating whether the SV contains an integer. Checks the private setting. Use "SvIOK". U32 SvIOKp(SV* sv) SvIOK_notUV Returns a boolean indicating whether the SV contains a signed integer. bool SvIOK_notUV(SV* sv) SvIOK_off Unsets the IV status of an SV. void SvIOK_off(SV* sv) SvIOK_on Tells an SV that it is an integer. void SvIOK_on(SV* sv) SvIOK_only Tells an SV that it is an integer and disables all other OK bits. void SvIOK_only(SV* sv) SvIOK_only_UV Tells and SV that it is an unsigned integer and disables all other OK bits. void SvIOK_only_UV(SV* sv) SvIOK_UV Returns a boolean indicating whether the SV contains an unsigned integer. bool SvIOK_UV(SV* sv) SvIsCOW Returns a boolean indicating whether the SV is Copy-On-Write. (either shared hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for COW) bool SvIsCOW(SV* sv) SvIsCOW_shared_hash Returns a boolean indicating whether the SV is Copy-On-Write shared hash key scalar. bool SvIsCOW_shared_hash(SV* sv) SvIV Coerces the given SV to an integer and returns it. See "SvIVx" for a version which guarantees to evaluate sv only once. IV SvIV(SV* sv) SvIVX Returns the raw value in the SV's IV slot, without checks or conversions. Only use when you are sure SvIOK is true. See also "SvIV()". IV SvIVX(SV* sv) SvIVx Coerces the given SV to an integer and returns it. Guarantees to evaluate "sv" only once. Only use this if "sv" is an expression with side effects, otherwise use the more efficient "SvIV". IV SvIVx(SV* sv) SvIV_nomg Like "SvIV" but doesn't process magic. IV SvIV_nomg(SV* sv) SvIV_set Set the value of the IV pointer in sv to val. It is possible to perform the same function of this macro with an lvalue assignment to "SvIVX". With future Perls, however, it will be more efficient to use "SvIV_set" instead of the lvalue assignment to "SvIVX". void SvIV_set(SV* sv, IV val) SvLEN Returns the size of the string buffer in the SV, not including any part attributable to "SvOOK". See "SvCUR". STRLEN SvLEN(SV* sv) SvLEN_set Set the actual length of the string which is in the SV. See "SvIV_set". void SvLEN_set(SV* sv, STRLEN len) SvMAGIC_set Set the value of the MAGIC pointer in sv to val. See "SvIV_set". void SvMAGIC_set(SV* sv, MAGIC* val) SvNIOK Returns a U32 value indicating whether the SV contains a number, integer or double. U32 SvNIOK(SV* sv) SvNIOKp Returns a U32 value indicating whether the SV contains a number, integer or double. Checks the private setting. Use "SvNIOK". U32 SvNIOKp(SV* sv) SvNIOK_off Unsets the NV/IV status of an SV. void SvNIOK_off(SV* sv) SvNOK Returns a U32 value indicating whether the SV contains a double. U32 SvNOK(SV* sv) SvNOKp Returns a U32 value indicating whether the SV contains a double. Checks the private setting. Use "SvNOK". U32 SvNOKp(SV* sv) SvNOK_off Unsets the NV status of an SV. void SvNOK_off(SV* sv) SvNOK_on Tells an SV that it is a double. void SvNOK_on(SV* sv) SvNOK_only Tells an SV that it is a double and disables all other OK bits. void SvNOK_only(SV* sv) SvNV Coerce the given SV to a double and return it. See "SvNVx" for a version which guarantees to evaluate sv only once. NV SvNV(SV* sv) SvNVX Returns the raw value in the SV's NV slot, without checks or conversions. Only use when you are sure SvNOK is true. See also "SvNV()". NV SvNVX(SV* sv) SvNVx Coerces the given SV to a double and returns it. Guarantees to evaluate "sv" only once. Only use this if "sv" is an expression with side effects, otherwise use the more efficient "SvNV". NV SvNVx(SV* sv) SvNV_set Set the value of the NV pointer in sv to val. See "SvIV_set". void SvNV_set(SV* sv, NV val) SvOK Returns a U32 value indicating whether the value is an SV. It also tells whether the value is defined or not. U32 SvOK(SV* sv) SvOOK Returns a U32 indicating whether the SvIVX is a valid offset value for the SvPVX. This hack is used internally to speed up removal of characters from the beginning of a SvPV. When SvOOK is true, then the start of the allocated string buffer is really (SvPVX - SvIVX). U32 SvOOK(SV* sv) SvPOK Returns a U32 value indicating whether the SV contains a character string. U32 SvPOK(SV* sv) SvPOKp Returns a U32 value indicating whether the SV contains a character string. Checks the private setting. Use "SvPOK". U32 SvPOKp(SV* sv) SvPOK_off Unsets the PV status of an SV. void SvPOK_off(SV* sv) SvPOK_on Tells an SV that it is a string. void SvPOK_on(SV* sv) SvPOK_only Tells an SV that it is a string and disables all other OK bits. Will also turn off the UTF-8 status. void SvPOK_only(SV* sv) SvPOK_only_UTF8 Tells an SV that it is a string and disables all other OK bits, and leaves the UTF-8 status as it was. void SvPOK_only_UTF8(SV* sv) SvPV Returns a pointer to the string in the SV, or a stringified form of the SV if the SV does not contain a string. The SV may cache the stringified version becoming "SvPOK". Handles 'get' magic. See also "SvPVx" for a version which guarantees to evaluate sv only once. char* SvPV(SV* sv, STRLEN len) SvPVbyte Like "SvPV", but converts sv to byte representation first if necessary. char* SvPVbyte(SV* sv, STRLEN len) SvPVbytex Like "SvPV", but converts sv to byte representation first if necessary. Guarantees to evaluate sv only once; use the more effi- cient "SvPVbyte" otherwise. char* SvPVbytex(SV* sv, STRLEN len) SvPVbytex_force Like "SvPV_force", but converts sv to byte representation first if necessary. Guarantees to evaluate sv only once; use the more efficient "SvPVbyte_force" otherwise. char* SvPVbytex_force(SV* sv, STRLEN len) SvPVbyte_force Like "SvPV_force", but converts sv to byte representation first if necessary. char* SvPVbyte_force(SV* sv, STRLEN len) SvPVbyte_nolen Like "SvPV_nolen", but converts sv to byte representation first if necessary. char* SvPVbyte_nolen(SV* sv) SvPVutf8 Like "SvPV", but converts sv to utf8 first if necessary. char* SvPVutf8(SV* sv, STRLEN len) SvPVutf8x Like "SvPV", but converts sv to utf8 first if necessary. Guarantees to evaluate sv only once; use the more efficient "SvPVutf8" otherwise. char* SvPVutf8x(SV* sv, STRLEN len) SvPVutf8x_force Like "SvPV_force", but converts sv to utf8 first if necessary. Guarantees to evaluate sv only once; use the more efficient "SvPVutf8_force" otherwise. char* SvPVutf8x_force(SV* sv, STRLEN len) SvPVutf8_force Like "SvPV_force", but converts sv to utf8 first if necessary. char* SvPVutf8_force(SV* sv, STRLEN len) SvPVutf8_nolen Like "SvPV_nolen", but converts sv to utf8 first if necessary. char* SvPVutf8_nolen(SV* sv) SvPVX Returns a pointer to the physical string in the SV. The SV must contain a string. char* SvPVX(SV* sv) SvPVx A version of "SvPV" which guarantees to evaluate "sv" only once. Only use this if "sv" is an expression with side effects, other- wise use the more efficient "SvPVX". char* SvPVx(SV* sv, STRLEN len) SvPV_force Like "SvPV" but will force the SV into containing just a string ("SvPOK_only"). You want force if you are going to update the "SvPVX" directly. char* SvPV_force(SV* sv, STRLEN len) SvPV_force_nomg Like "SvPV" but will force the SV into containing just a string ("SvPOK_only"). You want force if you are going to update the "SvPVX" directly. Doesn't process magic. char* SvPV_force_nomg(SV* sv, STRLEN len) SvPV_nolen Returns a pointer to the string in the SV, or a stringified form of the SV if the SV does not contain a string. The SV may cache the stringified form becoming "SvPOK". Handles 'get' magic. char* SvPV_nolen(SV* sv) SvPV_nomg Like "SvPV" but doesn't process magic. char* SvPV_nomg(SV* sv, STRLEN len) SvPV_set Set the value of the PV pointer in sv to val. See "SvIV_set". void SvPV_set(SV* sv, char* val) SvREFCNT Returns the value of the object's reference count. U32 SvREFCNT(SV* sv) SvREFCNT_dec Decrements the reference count of the given SV. void SvREFCNT_dec(SV* sv) SvREFCNT_inc Increments the reference count of the given SV. All of the following SvREFCNT_inc* macros are optimized versions of SvREFCNT_inc, and can be replaced with SvREFCNT_inc. SV* SvREFCNT_inc(SV* sv) SvREFCNT_inc_NN Same as SvREFCNT_inc, but can only be used if you know sv is not NULL. Since we don't have to check the NULLness, it's faster and smaller. SV* SvREFCNT_inc_NN(SV* sv) SvREFCNT_inc_simple Same as SvREFCNT_inc, but can only be used with expressions without side effects. Since we don't have to store a temporary value, it's faster. SV* SvREFCNT_inc_simple(SV* sv) SvREFCNT_inc_simple_NN Same as SvREFCNT_inc_simple, but can only be used if you know sv is not NULL. Since we don't have to check the NULLness, it's faster and smaller. SV* SvREFCNT_inc_simple_NN(SV* sv) SvREFCNT_inc_simple_void Same as SvREFCNT_inc_simple, but can only be used if you don't need the return value. The macro doesn't need to return a meaning- ful value. void SvREFCNT_inc_simple_void(SV* sv) SvREFCNT_inc_simple_void_NN Same as SvREFCNT_inc, but can only be used if you don't need the return value, and you know that sv is not NULL. The macro doesn't need to return a meaningful value, or check for NULLness, so it's smaller and faster. void SvREFCNT_inc_simple_void_NN(SV* sv) SvREFCNT_inc_void Same as SvREFCNT_inc, but can only be used if you don't need the return value. The macro doesn't need to return a meaningful value. void SvREFCNT_inc_void(SV* sv) SvREFCNT_inc_void_NN Same as SvREFCNT_inc, but can only be used if you don't need the return value, and you know that sv is not NULL. The macro doesn't need to return a meaningful value, or check for NULLness, so it's smaller and faster. void SvREFCNT_inc_void_NN(SV* sv) SvROK Tests if the SV is an RV. U32 SvROK(SV* sv) SvROK_off Unsets the RV status of an SV. void SvROK_off(SV* sv) SvROK_on Tells an SV that it is an RV. void SvROK_on(SV* sv) SvRV Dereferences an RV to return the SV. SV* SvRV(SV* sv) SvRV_set Set the value of the RV pointer in sv to val. See "SvIV_set". void SvRV_set(SV* sv, SV* val) SvSTASH Returns the stash of the SV. HV* SvSTASH(SV* sv) SvSTASH_set Set the value of the STASH pointer in sv to val. See "SvIV_set". void SvSTASH_set(SV* sv, HV* val) SvTAINT Taints an SV if tainting is enabled. void SvTAINT(SV* sv) SvTAINTED Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if not. bool SvTAINTED(SV* sv) SvTAINTED_off Untaints an SV. Be very careful with this routine, as it short-circuits some of Perl's fundamental security features. XS module authors should not use this function unless they fully understand all the implications of unconditionally untainting the value. Untainting should be done in the standard perl fashion, via a carefully crafted regexp, rather than directly untainting variables. void SvTAINTED_off(SV* sv) SvTAINTED_on Marks an SV as tainted if tainting is enabled. void SvTAINTED_on(SV* sv) SvTRUE Returns a boolean indicating whether Perl would evaluate the SV as true or false, defined or undefined. Does not handle 'get' magic. bool SvTRUE(SV* sv) SvTYPE Returns the type of the SV. See "svtype". svtype SvTYPE(SV* sv) SvUOK Returns a boolean indicating whether the SV contains an unsigned integer. bool SvUOK(SV* sv) SvUPGRADE Used to upgrade an SV to a more complex form. Uses "sv_upgrade" to perform the upgrade if necessary. See "svtype". void SvUPGRADE(SV* sv, svtype type) SvUTF8 Returns a U32 value indicating whether the SV contains UTF-8 encoded data. Call this after SvPV() in case any call to string over- loading updates the internal flag. U32 SvUTF8(SV* sv) SvUTF8_off Unsets the UTF-8 status of an SV. void SvUTF8_off(SV *sv) SvUTF8_on Turn on the UTF-8 status of an SV (the data is not changed, just the flag). Do not use frivolously. void SvUTF8_on(SV *sv) SvUV Coerces the given SV to an unsigned integer and returns it. See "SvUVx" for a version which guarantees to evaluate sv only once. UV SvUV(SV* sv) SvUVX Returns the raw value in the SV's UV slot, without checks or conversions. Only use when you are sure SvIOK is true. See also "SvUV()". UV SvUVX(SV* sv) SvUVx Coerces the given SV to an unsigned integer and returns it. Guarantees to "sv" only once. Only use this if "sv" is an expression with side effects, otherwise use the more efficient "SvUV". UV SvUVx(SV* sv) SvUV_nomg Like "SvUV" but doesn't process magic. UV SvUV_nomg(SV* sv) SvUV_set Set the value of the UV pointer in sv to val. See "SvIV_set". void SvUV_set(SV* sv, UV val) sv_catpvn_nomg Like "sv_catpvn" but doesn't process magic. void sv_catpvn_nomg(SV* sv, const char* ptr, STRLEN len) sv_catsv_nomg Like "sv_catsv" but doesn't process magic. void sv_catsv_nomg(SV* dsv, SV* ssv) sv_derived_from Returns a boolean indicating whether the SV is derived from the specified class at the C level. To check derivation at the Perl level, call "isa()" as a normal Perl method. bool sv_derived_from(SV* sv, const char* name) sv_report_used Dump the contents of all SVs not yet freed. (Debugging aid). void sv_report_used() sv_setsv_nomg Like "sv_setsv" but doesn't process magic. void sv_setsv_nomg(SV* dsv, SV* ssv) SV-Body Allocation looks_like_number Test if the content of an SV looks like a number (or is a number). "Inf" and "Infinity" are treated as numbers (so will not issue a non-numeric warning), even if your atof() doesn't grok them. I32 looks_like_number(SV* sv) newRV_noinc Creates an RV wrapper for an SV. The reference count for the original SV is not incremented. SV* newRV_noinc(SV* sv) newSV Creates a new SV. A non-zero "len" parameter indicates the number of bytes of preallocated string space the SV should have. An extra byte for a trailing NUL is also reserved. (SvPOK is not set for the SV even if string space is allocated.) The reference count for the new SV is set to 1. In 5.9.3, newSV() replaces the older NEWSV() API, and drops the first parameter, x, a debug aid which allowed callers to identify themselves. This aid has been superseded by a new build option, PERL_MEM_LOG (see "PERL_MEM_LOG" in perlhack). The older API is still there for use in XS modules supporting older perls. SV* newSV(STRLEN len) newSVhek Creates a new SV from the hash key structure. It will generate scalars that point to the shared string table where possible. Returns a new (undefined) SV if the hek is NULL. SV* newSVhek(const HEK *hek) newSViv Creates a new SV and copies an integer into it. The reference count for the SV is set to 1. SV* newSViv(IV i) newSVnv Creates a new SV and copies a floating point value into it. The reference count for the SV is set to 1. SV* newSVnv(NV n) newSVpv Creates a new SV and copies a string into it. The reference count for the SV is set to 1. If "len" is zero, Perl will compute the length using strlen(). For efficiency, consider using "newSVpvn" instead. SV* newSVpv(const char* s, STRLEN len) newSVpvf Creates a new SV and initializes it with the string formatted like "sprintf". SV* newSVpvf(const char* pat, ...) newSVpvn Creates a new SV and copies a string into it. The reference count for the SV is set to 1. Note that if "len" is zero, Perl will create a zero length string. You are responsible for ensuring that the source string is at least "len" bytes long. If the "s" argument is NULL the new SV will be undefined. SV* newSVpvn(const char* s, STRLEN len) newSVpvn_flags Creates a new SV and copies a string into it. The reference count for the SV is set to 1. Note that if "len" is zero, Perl will create a zero length string. You are responsible for ensuring that the source string is at least "len" bytes long. If the "s" argument is NULL the new SV will be undefined. Currently the only flag bits accepted are "SVf_UTF8" and "SVs_TEMP". If "SVs_TEMP" is set, then "sv2mortal()" is called on the result before returning. If "SVf_UTF8" is set, then it will be set on the new SV. "newSVpvn_utf8()" is a convenience wrapper for this function, defined as #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0) SV* newSVpvn_flags(const char* s, STRLEN len, U32 flags) newSVpvn_share Creates a new SV with its SvPVX_const pointing to a shared string in the string table. If the string does not already exist in the table, it is created first. Turns on READONLY and FAKE. If the "hash" parameter is non-zero, that value is used; otherwise the hash is computed. The string's hash can be later be retrieved from the SV with the "SvSHARED_HASH()" macro. The idea here is that as the string table is used for shared hash keys these strings will have SvPVX_const == HeKEY and hash lookup will avoid string compare. SV* newSVpvn_share(const char* s, I32 len, U32 hash) newSVpvs Like "newSVpvn", but takes a literal string instead of a string/length pair. SV* newSVpvs(const char* s) newSVpvs_flags Like "newSVpvn_flags", but takes a literal string instead of a string/length pair. SV* newSVpvs_flags(const char* s, U32 flags) newSVpvs_share Like "newSVpvn_share", but takes a literal string instead of a string/length pair and omits the hash parameter. SV* newSVpvs_share(const char* s) newSVrv Creates a new SV for the RV, "rv", to point to. If "rv" is not an RV then it will be upgraded to one. If "classname" is non-null then the new SV will be blessed in the specified package. The new SV is returned and its reference count is 1. SV* newSVrv(SV* rv, const char* classname) newSVsv Creates a new SV which is an exact duplicate of the original SV. (Uses "sv_setsv"). SV* newSVsv(SV* old) newSVuv Creates a new SV and copies an unsigned integer into it. The reference count for the SV is set to 1. SV* newSVuv(UV u) newSV_type Creates a new SV, of the type specified. The reference count for the new SV is set to 1. SV* newSV_type(svtype type) sv_2bool This function is only called on magical items, and is only used by sv_true() or its macro equivalent. bool sv_2bool(SV* sv) sv_2cv Using various gambits, try to get a CV from an SV; in addition, try if possible to set *st and *gvp to the stash and GV associated with it. The flags in "lref" are passed to sv_fetchsv. CV* sv_2cv(SV* sv, HV** st, GV** gvp, I32 lref) sv_2io Using various gambits, try to get an IO from an SV: the IO slot if its a GV; or the recursive result if we're an RV; or the IO slot of the symbol named after the PV if we're a string. IO* sv_2io(SV* sv) sv_2iv_flags Return the integer value of an SV, doing any necessary string conversion. If flags includes SV_GMAGIC, does an mg_get() first. Normally used via the "SvIV(sv)" and "SvIVx(sv)" macros. IV sv_2iv_flags(SV* sv, I32 flags) sv_2mortal Marks an existing SV as mortal. The SV will be destroyed "soon", either by an explicit call to FREETMPS, or by an implicit call at places such as statement boundaries. SvTEMP() is turned on which means that the SV's string buffer can be "stolen" if this SV is copied. See also "sv_newmortal" and "sv_mortalcopy". SV* sv_2mortal(SV* sv) sv_2nv Return the num value of an SV, doing any necessary string or integer conversion, magic etc. Normally used via the "SvNV(sv)" and "SvNVx(sv)" macros. NV sv_2nv(SV* sv) sv_2pvbyte Return a pointer to the byte-encoded representation of the SV, and set *lp to its length. May cause the SV to be downgraded from UTF-8 as a side-effect. Usually accessed via the "SvPVbyte" macro. char* sv_2pvbyte(SV* sv, STRLEN* lp) sv_2pvutf8 Return a pointer to the UTF-8-encoded representation of the SV, and set *lp to its length. May cause the SV to be upgraded to UTF-8 as a side-effect. Usually accessed via the "SvPVutf8" macro. char* sv_2pvutf8(SV* sv, STRLEN* lp) sv_2pv_flags Returns a pointer to the string value of an SV, and sets *lp to its length. If flags includes SV_GMAGIC, does an mg_get() first. Coerces sv to a string if necessary. Normally invoked via the "SvPV_flags" macro. "sv_2pv()" and "sv_2pv_nomg" usually end up here too. char* sv_2pv_flags(SV* sv, STRLEN* lp, I32 flags) sv_2uv_flags Return the unsigned integer value of an SV, doing any necessary string conversion. If flags includes SV_GMAGIC, does an mg_get() first. Normally used via the "SvUV(sv)" and "SvUVx(sv)" macros. UV sv_2uv_flags(SV* sv, I32 flags) sv_backoff Remove any string offset. You should normally use the "SvOOK_off" macro wrapper instead. int sv_backoff(SV* sv) sv_bless Blesses an SV into a specified package. The SV must be an RV. The package must be designated by its stash (see "gv_stashpv()"). The reference count of the SV is unaffected. SV* sv_bless(SV* sv, HV* stash) sv_catpv Concatenates the string onto the end of the string which is in the SV. If the SV has the UTF-8 status set, then the bytes appended should be valid UTF-8. Handles 'get' magic, but not 'set' magic. See "sv_catpv_mg". void sv_catpv(SV* sv, const char* ptr) sv_catpvf Processes its arguments like "sprintf" and appends the formatted output to an SV. If the appended data contains "wide" characters (including, but not limited to, SVs with a UTF-8 PV formatted with %s, and characters >255 formatted with %c), the original SV might get upgraded to UTF-8. Handles 'get' magic, but not 'set' magic. See "sv_catpvf_mg". If the original SV was UTF-8, the pat- tern should be valid UTF-8; if the original SV was bytes, the pattern should be too. void sv_catpvf(SV* sv, const char* pat, ...) sv_catpvf_mg Like "sv_catpvf", but also handles 'set' magic. void sv_catpvf_mg(SV *sv, const char* pat, ...) sv_catpvn Concatenates the string onto the end of the string which is in the SV. The "len" indicates number of bytes to copy. If the SV has the UTF-8 status set, then the bytes appended should be valid UTF-8. Handles 'get' magic, but not 'set' magic. See "sv_cat- pvn_mg". void sv_catpvn(SV* sv, const char* ptr, STRLEN len) sv_catpvn_flags Concatenates the string onto the end of the string which is in the SV. The "len" indicates number of bytes to copy. If the SV has the UTF-8 status set, then the bytes appended should be valid UTF-8. If "flags" has "SV_GMAGIC" bit set, will "mg_get" on "dsv" if appropriate, else not. "sv_catpvn" and "sv_catpvn_nomg" are implemented in terms of this function. void sv_catpvn_flags(SV* sv, const char* ptr, STRLEN len, I32 flags) sv_catpvs Like "sv_catpvn", but takes a literal string instead of a string/length pair. void sv_catpvs(SV* sv, const char* s) sv_catpv_mg Like "sv_catpv", but also handles 'set' magic. void sv_catpv_mg(SV *sv, const char *ptr) sv_catsv Concatenates the string from SV "ssv" onto the end of the string in SV "dsv". Modifies "dsv" but not "ssv". Handles 'get' magic, but not 'set' magic. See "sv_catsv_mg". void sv_catsv(SV* dsv, SV* ssv) sv_catsv_flags Concatenates the string from SV "ssv" onto the end of the string in SV "dsv". Modifies "dsv" but not "ssv". If "flags" has "SV_GMAGIC" bit set, will "mg_get" on the SVs if appropriate, else not. "sv_catsv" and "sv_catsv_nomg" are implemented in terms of this function. void sv_catsv_flags(SV* dsv, SV* ssv, I32 flags) sv_chop Efficient removal of characters from the beginning of the string buffer. SvPOK(sv) must be true and the "ptr" must be a pointer to somewhere inside the string buffer. The "ptr" becomes the first character of the adjusted string. Uses the "OOK hack". Beware: after this function returns, "ptr" and SvPVX_const(sv) may no longer refer to the same chunk of data. void sv_chop(SV* sv, char* ptr) sv_clear Clear an SV: call any destructors, free up any memory used by the body, and free the body itself. The SV's head is not freed, although its type is set to all 1's so that it won't inadvertently be assumed to be live during global destruction etc. This func- tion should only be called when REFCNT is zero. Most of the time you'll want to call "sv_free()" (or its macro wrapper "SvRE- FCNT_dec") instead. void sv_clear(SV* sv) sv_cmp Compares the strings in two SVs. Returns -1, 0, or 1 indicating whether the string in "sv1" is less than, equal to, or greater than the string in "sv2". Is UTF-8 and 'use bytes' aware, handles get magic, and will coerce its args to strings if necessary. See also "sv_cmp_locale". I32 sv_cmp(SV* sv1, SV* sv2) sv_cmp_locale Compares the strings in two SVs in a locale-aware manner. Is UTF-8 and 'use bytes' aware, handles get magic, and will coerce its args to strings if necessary. See also "sv_cmp". I32 sv_cmp_locale(SV* sv1, SV* sv2) sv_collxfrm Add Collate Transform magic to an SV if it doesn't already have it. Any scalar variable may carry PERL_MAGIC_collxfrm magic that contains the scalar data of the variable, but transformed to such a format that a normal memory comparison can be used to compare the data according to the locale settings. char* sv_collxfrm(SV* sv, STRLEN* nxp) sv_copypv Copies a stringified representation of the source SV into the destination SV. Automatically performs any necessary mg_get and coercion of numeric values into strings. Guaranteed to preserve UTF8 flag even from overloaded objects. Similar in nature to sv_2pv[_flags] but operates directly on an SV instead of just the string. Mostly uses sv_2pv_flags to do its work, except when that would lose the UTF-8'ness of the PV. void sv_copypv(SV* dsv, SV* ssv) sv_dec Auto-decrement of the value in the SV, doing string to numeric conversion if necessary. Handles 'get' magic. void sv_dec(SV* sv) sv_eq Returns a boolean indicating whether the strings in the two SVs are identical. Is UTF-8 and 'use bytes' aware, handles get magic, and will coerce its args to strings if necessary. I32 sv_eq(SV* sv1, SV* sv2) sv_force_normal_flags Undo various types of fakery on an SV: if the PV is a shared string, make a private copy; if we're a ref, stop refing; if we're a glob, downgrade to an xpvmg. The "flags" parameter gets passed to "sv_unref_flags()" when unrefing. "sv_force_normal" calls this function with flags set to 0. void sv_force_normal_flags(SV *sv, U32 flags) sv_free Decrement an SV's reference count, and if it drops to zero, call "sv_clear" to invoke destructors and free up any memory used by the body; finally, deallocate the SV's head itself. Normally called via a wrapper macro "SvREFCNT_dec". void sv_free(SV* sv) sv_gets Get a line from the filehandle and store it into the SV, optionally appending to the currently-stored string. char* sv_gets(SV* sv, PerlIO* fp, I32 append) sv_grow Expands the character buffer in the SV. If necessary, uses "sv_unref" and upgrades the SV to "SVt_PV". Returns a pointer to the character buffer. Use the "SvGROW" wrapper instead. char* sv_grow(SV* sv, STRLEN newlen) sv_inc Auto-increment of the value in the SV, doing string to numeric conversion if necessary. Handles 'get' magic. void sv_inc(SV* sv) sv_insert Inserts a string at the specified offset/length within the SV. Similar to the Perl substr() function. void sv_insert(SV* bigsv, STRLEN offset, STRLEN len, char* little, STRLEN littlelen) sv_isa Returns a boolean indicating whether the SV is blessed into the specified class. This does not check for subtypes; use "sv_derived_from" to verify an inheritance relationship. int sv_isa(SV* sv, const char* name) sv_isobject Returns a boolean indicating whether the SV is an RV pointing to a blessed object. If the SV is not an RV, or if the object is not blessed, then this will return false. int sv_isobject(SV* sv) sv_len Returns the length of the string in the SV. Handles magic and type coercion. See also "SvCUR", which gives raw access to the xpv_cur slot. STRLEN sv_len(SV* sv) sv_len_utf8 Returns the number of characters in the string in an SV, counting wide UTF-8 bytes as a single character. Handles magic and type coercion. STRLEN sv_len_utf8(SV* sv) sv_magic Adds magic to an SV. First upgrades "sv" to type "SVt_PVMG" if necessary, then adds a new magic item of type "how" to the head of the magic list. See "sv_magicext" (which "sv_magic" now calls) for a description of the handling of the "name" and "namlen" arguments. You need to use "sv_magicext" to add magic to SvREADONLY SVs and also to add more than one instance of the same 'how'. void sv_magic(SV* sv, SV* obj, int how, const char* name, I32 namlen) sv_magicext Adds magic to an SV, upgrading it if necessary. Applies the supplied vtable and returns a pointer to the magic added. Note that "sv_magicext" will allow things that "sv_magic" will not. In particular, you can add magic to SvREADONLY SVs, and add more than one instance of the same 'how'. If "namlen" is greater than zero then a "savepvn" copy of "name" is stored, if "namlen" is zero then "name" is stored as-is and - as another special case - if "(name && namlen == HEf_SVKEY)" then "name" is assumed to contain an "SV*" and is stored as-is with its REFCNT incremented. (This is now used as a subroutine by "sv_magic".) MAGIC * sv_magicext(SV* sv, SV* obj, int how, MGVTBL *vtbl, const char* name, I32 namlen) sv_mortalcopy Creates a new SV which is a copy of the original SV (using "sv_setsv"). The new SV is marked as mortal. It will be destroyed "soon", either by an explicit call to FREETMPS, or by an implicit call at places such as statement boundaries. See also "sv_new- mortal" and "sv_2mortal". SV* sv_mortalcopy(SV* oldsv) sv_newmortal Creates a new null SV which is mortal. The reference count of the SV is set to 1. It will be destroyed "soon", either by an explicit call to FREETMPS, or by an implicit call at places such as statement boundaries. See also "sv_mortalcopy" and "sv_2mor- tal". SV* sv_newmortal() sv_newref Increment an SV's reference count. Use the "SvREFCNT_inc()" wrapper instead. SV* sv_newref(SV* sv) sv_pos_b2u Converts the value pointed to by offsetp from a count of bytes from the start of the string, to a count of the equivalent number of UTF-8 chars. Handles magic and type coercion. void sv_pos_b2u(SV* sv, I32* offsetp) sv_pos_u2b Converts the value pointed to by offsetp from a count of UTF-8 chars from the start of the string, to a count of the equivalent number of bytes; if lenp is non-zero, it does the same to lenp, but this time starting from the offset, rather than from the start of the string. Handles magic and type coercion. void sv_pos_u2b(SV* sv, I32* offsetp, I32* lenp) sv_pvbyten_force The backend for the "SvPVbytex_force" macro. Always use the macro instead. char* sv_pvbyten_force(SV* sv, STRLEN* lp) sv_pvn_force Get a sensible string out of the SV somehow. A private implementation of the "SvPV_force" macro for compilers which can't cope with complex macro expressions. Always use the macro instead. char* sv_pvn_force(SV* sv, STRLEN* lp) sv_pvn_force_flags Get a sensible string out of the SV somehow. If "flags" has "SV_GMAGIC" bit set, will "mg_get" on "sv" if appropriate, else not. "sv_pvn_force" and "sv_pvn_force_nomg" are implemented in terms of this function. You normally want to use the various wrapper macros instead: see "SvPV_force" and "SvPV_force_nomg" char* sv_pvn_force_flags(SV* sv, STRLEN* lp, I32 flags) sv_pvutf8n_force The backend for the "SvPVutf8x_force" macro. Always use the macro instead. char* sv_pvutf8n_force(SV* sv, STRLEN* lp) sv_reftype Returns a string describing what the SV is a reference to. char* sv_reftype(SV* sv, int ob) sv_replace Make the first argument a copy of the second, then delete the original. The target SV physically takes over ownership of the body of the source SV and inherits its flags; however, the target keeps any magic it owns, and any magic in the source is discarded. Note that this is a rather specialist SV copying operation; most of the time you'll want to use "sv_setsv" or one of its many macro front-ends. void sv_replace(SV* sv, SV* nsv) sv_reset Underlying implementation for the "reset" Perl function. Note that the perl-level function is vaguely deprecated. void sv_reset(char* s, HV* stash) sv_rvweaken Weaken a reference: set the "SvWEAKREF" flag on this RV; give the referred-to SV "PERL_MAGIC_backref" magic if it hasn't already; and push a back-reference to this RV onto the array of backreferences associated with that magic. SV* sv_rvweaken(SV *sv) sv_setiv Copies an integer into the given SV, upgrading first if necessary. Does not handle 'set' magic. See also "sv_setiv_mg". void sv_setiv(SV* sv, IV num) sv_setiv_mg Like "sv_setiv", but also handles 'set' magic. void sv_setiv_mg(SV *sv, IV i) sv_setnv Copies a double into the given SV, upgrading first if necessary. Does not handle 'set' magic. See also "sv_setnv_mg". void sv_setnv(SV* sv, NV num) sv_setnv_mg Like "sv_setnv", but also handles 'set' magic. void sv_setnv_mg(SV *sv, NV num) sv_setpv Copies a string into an SV. The string must be null-terminated. Does not handle 'set' magic. See "sv_setpv_mg". void sv_setpv(SV* sv, const char* ptr) sv_setpvf Works like "sv_catpvf" but copies the text into the SV instead of appending it. Does not handle 'set' magic. See "sv_setpvf_mg". void sv_setpvf(SV* sv, const char* pat, ...) sv_setpvf_mg Like "sv_setpvf", but also handles 'set' magic. void sv_setpvf_mg(SV *sv, const char* pat, ...) sv_setpviv Copies an integer into the given SV, also updating its string value. Does not handle 'set' magic. See "sv_setpviv_mg". void sv_setpviv(SV* sv, IV num) sv_setpviv_mg Like "sv_setpviv", but also handles 'set' magic. void sv_setpviv_mg(SV *sv, IV iv) sv_setpvn Copies a string into an SV. The "len" parameter indicates the number of bytes to be copied. If the "ptr" argument is NULL the SV will become undefined. Does not handle 'set' magic. See "sv_setpvn_mg". void sv_setpvn(SV* sv, const char* ptr, STRLEN len) sv_setpvn_mg Like "sv_setpvn", but also handles 'set' magic. void sv_setpvn_mg(SV *sv, const char *ptr, STRLEN len) sv_setpvs Like "sv_setpvn", but takes a literal string instead of a string/length pair. void sv_setpvs(SV* sv, const char* s) sv_setpv_mg Like "sv_setpv", but also handles 'set' magic. void sv_setpv_mg(SV *sv, const char *ptr) sv_setref_iv Copies an integer into a new SV, optionally blessing the SV. The "rv" argument will be upgraded to an RV. That RV will be modi- fied to point to the new SV. The "classname" argument indicates the package for the blessing. Set "classname" to "NULL" to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. SV* sv_setref_iv(SV* rv, const char* classname, IV iv) sv_setref_nv Copies a double into a new SV, optionally blessing the SV. The "rv" argument will be upgraded to an RV. That RV will be modified to point to the new SV. The "classname" argument indicates the package for the blessing. Set "classname" to "NULL" to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. SV* sv_setref_nv(SV* rv, const char* classname, NV nv) sv_setref_pv Copies a pointer into a new SV, optionally blessing the SV. The "rv" argument will be upgraded to an RV. That RV will be modified to point to the new SV. If the "pv" argument is NULL then "PL_sv_undef" will be placed into the SV. The "classname" argument indicates the package for the blessing. Set "classname" to "NULL" to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. Do not use with other Perl types such as HV, AV, SV, CV, because those objects will become corrupted by the pointer copy process. Note that "sv_setref_pvn" copies the string while this copies the pointer. SV* sv_setref_pv(SV* rv, const char* classname, void* pv) sv_setref_pvn Copies a string into a new SV, optionally blessing the SV. The length of the string must be specified with "n". The "rv" argument will be upgraded to an RV. That RV will be modified to point to the new SV. The "classname" argument indicates the package for the blessing. Set "classname" to "NULL" to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. Note that "sv_setref_pv" copies the pointer while this copies the string. SV* sv_setref_pvn(SV* rv, const char* classname, char* pv, STRLEN n) sv_setref_uv Copies an unsigned integer into a new SV, optionally blessing the SV. The "rv" argument will be upgraded to an RV. That RV will be modified to point to the new SV. The "classname" argument indicates the package for the blessing. Set "classname" to "NULL" to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. SV* sv_setref_uv(SV* rv, const char* classname, UV uv) sv_setsv Copies the contents of the source SV "ssv" into the destination SV "dsv". The source SV may be destroyed if it is mortal, so don't use this function if the source SV needs to be reused. Does not handle 'set' magic. Loosely speaking, it performs a copy-by-value, obliterating any previous content of the destination. You probably want to use one of the assortment of wrappers, such as "SvSetSV", "SvSetSV_nosteal", "SvSetMagicSV" and "SvSetMag- icSV_nosteal". void sv_setsv(SV* dsv, SV* ssv) sv_setsv_flags Copies the contents of the source SV "ssv" into the destination SV "dsv". The source SV may be destroyed if it is mortal, so don't use this function if the source SV needs to be reused. Does not handle 'set' magic. Loosely speaking, it performs a copy-by-value, obliterating any previous content of the destination. If the "flags" parameter has the "SV_GMAGIC" bit set, will "mg_get" on "ssv" if appropriate, else not. If the "flags" parameter has the "NOSTEAL" bit set then the buffers of temps will not be stolen. <sv_setsv> and "sv_setsv_nomg" are implemented in terms of this function. You probably want to use one of the assortment of wrappers, such as "SvSetSV", "SvSetSV_nosteal", "SvSetMagicSV" and "SvSetMag- icSV_nosteal". This is the primary function for copying scalars, and most other copy-ish functions and macros use this underneath. void sv_setsv_flags(SV* dsv, SV* ssv, I32 flags) sv_setsv_mg Like "sv_setsv", but also handles 'set' magic. void sv_setsv_mg(SV *dstr, SV *sstr) sv_setuv Copies an unsigned integer into the given SV, upgrading first if necessary. Does not handle 'set' magic. See also "sv_setuv_mg". void sv_setuv(SV* sv, UV num) sv_setuv_mg Like "sv_setuv", but also handles 'set' magic. void sv_setuv_mg(SV *sv, UV u) sv_tainted Test an SV for taintedness. Use "SvTAINTED" instead. bool sv_tainted(SV* sv) sv_true Returns true if the SV has a true value by Perl's rules. Use the "SvTRUE" macro instead, which may call "sv_true()" or may instead use an in-line version. I32 sv_true(SV *sv) sv_unmagic Removes all magic of type "type" from an SV. int sv_unmagic(SV* sv, int type) sv_unref_flags Unsets the RV status of the SV, and decrements the reference count of whatever was being referenced by the RV. This can almost be thought of as a reversal of "newSVrv". The "cflags" argument can contain "SV_IMMEDIATE_UNREF" to force the reference count to be decremented (otherwise the decrementing is conditional on the reference count being different from one or the reference being a readonly SV). See "SvROK_off". void sv_unref_flags(SV* sv, U32 flags) sv_untaint Untaint an SV. Use "SvTAINTED_off" instead. void sv_untaint(SV* sv) sv_upgrade Upgrade an SV to a more complex form. Generally adds a new body type to the SV, then copies across as much information as possible from the old body. You generally want to use the "SvUPGRADE" macro wrapper. See also "svtype". bool sv_upgrade(SV* sv, U32 mt) sv_usepvn_flags Tells an SV to use "ptr" to find its string value. Normally the string is stored inside the SV but sv_usepvn allows the SV to use an outside string. The "ptr" should point to memory that was allocated by "malloc". The string length, "len", must be supplied. By default this function will realloc (i.e. move) the memory pointed to by "ptr", so that pointer should not be freed or used by the programmer after giving it to sv_usepvn, and neither should any pointers from "behind" that pointer (e.g. ptr + 1) be used. If "flags" & SV_SMAGIC is true, will call SvSETMAGIC. If "flags" & SV_HAS_TRAILING_NUL is true, then "ptr[len]" must be NUL, and the realloc will be skipped. (i.e. the buffer is actually at least 1 byte longer than "len", and already meets the requirements for storing in "SvPVX") void sv_usepvn_flags(SV* sv, char* ptr, STRLEN len, U32 flags) sv_utf8_decode If the PV of the SV is an octet sequence in UTF-8 and contains a multiple-byte character, the "SvUTF8" flag is turned on so that it looks like a character. If the PV contains only single-byte characters, the "SvUTF8" flag stays being off. Scans PV for validity and returns false if the PV is invalid UTF-8. NOTE: this function is experimental and may change or be removed without notice. bool sv_utf8_decode(SV *sv) sv_utf8_downgrade Attempts to convert the PV of an SV from characters to bytes. If the PV contains a character beyond byte, this conversion will fail; in this case, either returns false or, if "fail_ok" is not true, croaks. This is not as a general purpose Unicode to byte encoding interface: use the Encode extension for that. NOTE: this function is experimental and may change or be removed without notice. bool sv_utf8_downgrade(SV *sv, bool fail_ok) sv_utf8_encode Converts the PV of an SV to UTF-8, but then turns the "SvUTF8" flag off so that it looks like octets again. void sv_utf8_encode(SV *sv) sv_utf8_upgrade Converts the PV of an SV to its UTF-8-encoded form. Forces the SV to string form if it is not already. Always sets the SvUTF8 flag to avoid future validity checks even if all the bytes have hibit clear. This is not as a general purpose byte encoding to Unicode interface: use the Encode extension for that. STRLEN sv_utf8_upgrade(SV *sv) sv_utf8_upgrade_flags Converts the PV of an SV to its UTF-8-encoded form. Forces the SV to string form if it is not already. Always sets the SvUTF8 flag to avoid future validity checks even if all the bytes have hibit clear. If "flags" has "SV_GMAGIC" bit set, will "mg_get" on "sv" if appropriate, else not. "sv_utf8_upgrade" and "sv_utf8_upgrade_nomg" are implemented in terms of this function. This is not as a general purpose byte encoding to Unicode interface: use the Encode extension for that. STRLEN sv_utf8_upgrade_flags(SV *sv, I32 flags) sv_vcatpvf Processes its arguments like "vsprintf" and appends the formatted output to an SV. Does not handle 'set' magic. See "sv_vcat- pvf_mg". Usually used via its frontend "sv_catpvf". void sv_vcatpvf(SV* sv, const char* pat, va_list* args) sv_vcatpvfn Processes its arguments like "vsprintf" and appends the formatted output to an SV. Uses an array of SVs if the C style variable argument list is missing (NULL). When running with taint checks enabled, indicates via "maybe_tainted" if results are untrustwor- thy (often due to the use of locales). XXX Except that it maybe_tainted is never assigned to. Usually used via one of its frontends "sv_vcatpvf" and "sv_vcatpvf_mg". void sv_vcatpvfn(SV* sv, const char* pat, STRLEN patlen, va_list* args, SV** svargs, I32 svmax, bool *maybe_tainted) sv_vcatpvf_mg Like "sv_vcatpvf", but also handles 'set' magic. Usually used via its frontend "sv_catpvf_mg". void sv_vcatpvf_mg(SV* sv, const char* pat, va_list* args) sv_vsetpvf Works like "sv_vcatpvf" but copies the text into the SV instead of appending it. Does not handle 'set' magic. See "sv_vset- pvf_mg". Usually used via its frontend "sv_setpvf". void sv_vsetpvf(SV* sv, const char* pat, va_list* args) sv_vsetpvfn Works like "sv_vcatpvfn" but copies the text into the SV instead of appending it. Usually used via one of its frontends "sv_vsetpvf" and "sv_vsetpvf_mg". void sv_vsetpvfn(SV* sv, const char* pat, STRLEN patlen, va_list* args, SV** svargs, I32 svmax, bool *maybe_tainted) sv_vsetpvf_mg Like "sv_vsetpvf", but also handles 'set' magic. Usually used via its frontend "sv_setpvf_mg". void sv_vsetpvf_mg(SV* sv, const char* pat, va_list* args) Unicode Support bytes_from_utf8 Converts a string "s" of length "len" from UTF-8 into byte encoding. Unlike "utf8_to_bytes" but like "bytes_to_utf8", returns a pointer to the newly-created string, and updates "len" to contain the new length. Returns the original string if no conversion occurs, "len" is unchanged. Do nothing if "is_utf8" points to 0. Sets "is_utf8" to 0 if "s" is converted or contains all 7bit char- acters. NOTE: this function is experimental and may change or be removed without notice. U8* bytes_from_utf8(U8 *s, STRLEN *len, bool *is_utf8) bytes_to_utf8 Converts a string "s" of length "len" from ASCII into UTF-8 encoding. Returns a pointer to the newly-created string, and sets "len" to reflect the new length. If you want to convert to UTF-8 from other encodings than ASCII, see sv_recode_to_utf8(). NOTE: this function is experimental and may change or be removed without notice. U8* bytes_to_utf8(U8 *s, STRLEN *len) ibcmp_utf8 Return true if the strings s1 and s2 differ case-insensitively, false if not (if they are equal case-insensitively). If u1 is true, the string s1 is assumed to be in UTF-8-encoded Unicode. If u2 is true, the string s2 is assumed to be in UTF-8-encoded Uni- code. If u1 or u2 are false, the respective string is assumed to be in native 8-bit encoding. If the pe1 and pe2 are non-NULL, the scanning pointers will be copied in there (they will point at the beginning of the next char- acter). If the pointers behind pe1 or pe2 are non-NULL, they are the end pointers beyond which scanning will not continue under any circumstances. If the byte lengths l1 and l2 are non-zero, s1+l1 and s2+l2 will be used as goal end pointers that will also stop the scan, and which qualify towards defining a successful match: all the scans that define an explicit length must reach their goal pointers for a match to succeed). For case-insensitiveness, the "casefolding" of Unicode is used instead of upper/lowercasing both the characters, see http://www.unicode.org/unicode/reports/tr21/ (Case Mappings). I32 ibcmp_utf8(const char* a, char **pe1, UV l1, bool u1, const char* b, char **pe2, UV l2, bool u2) is_utf8_char Tests if some arbitrary number of bytes begins in a valid UTF-8 character. Note that an INVARIANT (i.e. ASCII) character is a valid UTF-8 character. The actual number of bytes in the UTF-8 character will be returned if it is valid, otherwise 0. STRLEN is_utf8_char(U8 *p) is_utf8_string Returns true if first "len" bytes of the given string form a valid UTF-8 string, false otherwise. Note that 'a valid UTF-8 string' does not mean 'a string that contains code points above 0x7F encoded in UTF-8' because a valid ASCII string is a valid UTF-8 string. See also is_utf8_string_loclen() and is_utf8_string_loc(). bool is_utf8_string(U8 *s, STRLEN len) is_utf8_string_loc Like is_utf8_string() but stores the location of the failure (in the case of "utf8ness failure") or the location s+len (in the case of "utf8ness success") in the "ep". See also is_utf8_string_loclen() and is_utf8_string(). bool is_utf8_string_loc(U8 *s, STRLEN len, U8 **p) is_utf8_string_loclen Like is_utf8_string() but stores the location of the failure (in the case of "utf8ness failure") or the location s+len (in the case of "utf8ness success") in the "ep", and the number of UTF-8 encoded characters in the "el". See also is_utf8_string_loc() and is_utf8_string(). bool is_utf8_string_loclen(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el) pv_uni_display Build to the scalar dsv a displayable version of the string spv, length len, the displayable version being at most pvlim bytes long (if longer, the rest is truncated and "..." will be appended). The flags argument can have UNI_DISPLAY_ISPRINT set to display isPRINT()able characters as themselves, UNI_DISPLAY_BACKSLASH to display the \[nrfta\] as the backslashed versions (like ' ') (UNI_DISPLAY_BACKSLASH is preferred over UNI_DISPLAY_ISPRINT for \). UNI_DISPLAY_QQ (and its alias UNI_DISPLAY_REGEX) have both UNI_DISPLAY_BACKSLASH and UNI_DISPLAY_ISPRINT turned on. The pointer to the PV of the dsv is returned. char* pv_uni_display(SV *dsv, U8 *spv, STRLEN len, STRLEN pvlim, UV flags) sv_cat_decode The encoding is assumed to be an Encode object, the PV of the ssv is assumed to be octets in that encoding and decoding the input starts from the position which (PV + *offset) pointed to. The dsv will be concatenated the decoded UTF-8 string from ssv. Decod- ing will terminate when the string tstr appears in decoding output or the input ends on the PV of the ssv. The value which the off- set points will be modified to the last input position on the ssv. Returns TRUE if the terminator was found, else returns FALSE. bool sv_cat_decode(SV* dsv, SV *encoding, SV *ssv, int *offset, char* tstr, int tlen) sv_recode_to_utf8 The encoding is assumed to be an Encode object, on entry the PV of the sv is assumed to be octets in that encoding, and the sv will be converted into Unicode (and UTF-8). If the sv already is UTF-8 (or if it is not POK), or if the encoding is not a reference, nothing is done to the sv. If the encod- ing is not an "Encode::XS" Encoding object, bad things will happen. (See lib/encoding.pm and Encode). The PV of the sv is returned. char* sv_recode_to_utf8(SV* sv, SV *encoding) sv_uni_display Build to the scalar dsv a displayable version of the scalar sv, the displayable version being at most pvlim bytes long (if longer, the rest is truncated and "..." will be appended). The flags argument is as in pv_uni_display(). The pointer to the PV of the dsv is returned. char* sv_uni_display(SV *dsv, SV *ssv, STRLEN pvlim, UV flags) to_utf8_case The "p" contains the pointer to the UTF-8 string encoding the character that is being converted. The "ustrp" is a pointer to the character buffer to put the conversion result to. The "lenp" is a pointer to the length of the result. The "swashp" is a pointer to the swash to use. Both the special and normal mappings are stored lib/unicore/To/Foo.pl, and loaded by SWASHNEW, using lib/utf8_heavy.pl. The spe- cial (usually, but not always, a multicharacter mapping), is tried first. The "special" is a string like "utf8::ToSpecLower", which means the hash %utf8::ToSpecLower. The access to the hash is through Perl_to_utf8_case(). The "normal" is a string like "ToLower" which means the swash %utf8::ToLower. UV to_utf8_case(U8 *p, U8* ustrp, STRLEN *lenp, SV **swashp, char *normal, char *special) to_utf8_fold Convert the UTF-8 encoded character at p to its foldcase version and store that in UTF-8 in ustrp and its length in bytes in lenp. Note that the ustrp needs to be at least UTF8_MAXBYTES_CASE+1 bytes since the foldcase version may be longer than the original character (up to three characters). The first character of the foldcased version is returned (but note, as explained above, that there may be more.) UV to_utf8_fold(U8 *p, U8* ustrp, STRLEN *lenp) to_utf8_lower Convert the UTF-8 encoded character at p to its lowercase version and store that in UTF-8 in ustrp and its length in bytes in lenp. Note that the ustrp needs to be at least UTF8_MAXBYTES_CASE+1 bytes since the lowercase version may be longer than the original character. The first character of the lowercased version is returned (but note, as explained above, that there may be more.) UV to_utf8_lower(U8 *p, U8* ustrp, STRLEN *lenp) to_utf8_title Convert the UTF-8 encoded character at p to its titlecase version and store that in UTF-8 in ustrp and its length in bytes in lenp. Note that the ustrp needs to be at least UTF8_MAXBYTES_CASE+1 bytes since the titlecase version may be longer than the original character. The first character of the titlecased version is returned (but note, as explained above, that there may be more.) UV to_utf8_title(U8 *p, U8* ustrp, STRLEN *lenp) to_utf8_upper Convert the UTF-8 encoded character at p to its uppercase version and store that in UTF-8 in ustrp and its length in bytes in lenp. Note that the ustrp needs to be at least UTF8_MAXBYTES_CASE+1 bytes since the uppercase version may be longer than the original character. The first character of the uppercased version is returned (but note, as explained above, that there may be more.) UV to_utf8_upper(U8 *p, U8* ustrp, STRLEN *lenp) utf8n_to_uvchr flags Returns the native character value of the first character in the string "s" which is assumed to be in UTF-8 encoding; "retlen" will be set to the length, in bytes, of that character. Allows length and flags to be passed to low level routine. UV utf8n_to_uvchr(U8 *s, STRLEN curlen, STRLEN *retlen, U32 flags) utf8n_to_uvuni Bottom level UTF-8 decode routine. Returns the Unicode code point value of the first character in the string "s" which is assumed to be in UTF-8 encoding and no longer than "curlen"; "retlen" will be set to the length, in bytes, of that character. If "s" does not point to a well-formed UTF-8 character, the behaviour is dependent on the value of "flags": if it contains UTF8_CHECK_ONLY, it is assumed that the caller will raise a warning, and this function will silently just set "retlen" to "-1" and return zero. If the "flags" does not contain UTF8_CHECK_ONLY, warnings about malformations will be given, "retlen" will be set to the expected length of the UTF-8 character in bytes, and zero will be returned. The "flags" can also contain various flags to allow deviations from the strict UTF-8 encoding (see utf8.h). Most code should use utf8_to_uvchr() rather than call this directly. UV utf8n_to_uvuni(U8 *s, STRLEN curlen, STRLEN *retlen, U32 flags) utf8_distance Returns the number of UTF-8 characters between the UTF-8 pointers "a" and "b". WARNING: use only if you *know* that the pointers point inside the same UTF-8 buffer. IV utf8_distance(U8 *a, U8 *b) utf8_hop Return the UTF-8 pointer "s" displaced by "off" characters, either forward or backward. WARNING: do not use the following unless you *know* "off" is within the UTF-8 data pointed to by "s" *and* that on entry "s" is aligned on the first byte of character or just after the last byte of a character. U8* utf8_hop(U8 *s, I32 off) utf8_length Return the length of the UTF-8 char encoded string "s" in characters. Stops at "e" (inclusive). If "e < s" or if the scan would end up past "e", croaks. STRLEN utf8_length(U8* s, U8 *e) utf8_to_bytes Converts a string "s" of length "len" from UTF-8 into byte encoding. Unlike "bytes_to_utf8", this over-writes the original string, and updates len to contain the new length. Returns zero on failure, setting "len" to -1. If you need a copy of the string, see "bytes_from_utf8". NOTE: this function is experimental and may change or be removed without notice. U8* utf8_to_bytes(U8 *s, STRLEN *len) utf8_to_uvchr Returns the native character value of the first character in the string "s" which is assumed to be in UTF-8 encoding; "retlen" will be set to the length, in bytes, of that character. If "s" does not point to a well-formed UTF-8 character, zero is returned and retlen is set, if possible, to -1. UV utf8_to_uvchr(U8 *s, STRLEN *retlen) utf8_to_uvuni Returns the Unicode code point of the first character in the string "s" which is assumed to be in UTF-8 encoding; "retlen" will be set to the length, in bytes, of that character. This function should only be used when returned UV is considered an index into the Unicode semantic tables (e.g. swashes). If "s" does not point to a well-formed UTF-8 character, zero is returned and retlen is set, if possible, to -1. UV utf8_to_uvuni(U8 *s, STRLEN *retlen) uvchr_to_utf8 Adds the UTF-8 representation of the Native codepoint "uv" to the end of the string "d"; "d" should be have at least "UTF8_MAXBYTES+1" free bytes available. The return value is the pointer to the byte after the end of the new character. In other words, d = uvchr_to_utf8(d, uv); is the recommended wide native character-aware way of saying *(d++) = uv; U8* uvchr_to_utf8(U8 *d, UV uv) uvuni_to_utf8_flags Adds the UTF-8 representation of the Unicode codepoint "uv" to the end of the string "d"; "d" should be have at least "UTF8_MAXBYTES+1" free bytes available. The return value is the pointer to the byte after the end of the new character. In other words, d = uvuni_to_utf8_flags(d, uv, flags); or, in most cases, d = uvuni_to_utf8(d, uv); (which is equivalent to) d = uvuni_to_utf8_flags(d, uv, 0); is the recommended Unicode-aware way of saying *(d++) = uv; U8* uvuni_to_utf8_flags(U8 *d, UV uv, UV flags) Variables created by ";xsubpp" and "xsubpp" internal functions ax Variable which is setup by "xsubpp" to indicate the stack base offset, used by the "ST", "XSprePUSH" and "XSRETURN" macros. The "dMARK" macro must be called prior to setup the "MARK" variable. I32 ax CLASS Variable which is setup by "xsubpp" to indicate the class name for a C++ XS constructor. This is always a "char*". See "THIS". char* CLASS dAX Sets up the "ax" variable. This is usually handled automatically by "xsubpp" by calling "dXSARGS". dAX; dAXMARK Sets up the "ax" variable and stack marker variable "mark". This is usually handled automatically by "xsubpp" by calling "dXSARGS". dAXMARK; dITEMS Sets up the "items" variable. This is usually handled automatically by "xsubpp" by calling "dXSARGS". dITEMS; dUNDERBAR Sets up the "padoff_du" variable for an XSUB that wishes to use "UNDERBAR". dUNDERBAR; dXSARGS Sets up stack and mark pointers for an XSUB, calling dSP and dMARK. Sets up the "ax" and "items" variables by calling "dAX" and "dITEMS". This is usually handled automatically by "xsubpp". dXSARGS; dXSI32 Sets up the "ix" variable for an XSUB which has aliases. This is usually handled automatically by "xsubpp". dXSI32; items Variable which is setup by "xsubpp" to indicate the number of items on the stack. See "Variable-length Parameter Lists" in perlxs. I32 items ix Variable which is setup by "xsubpp" to indicate which of an XSUB's aliases was used to invoke it. See "The ALIAS: Keyword" in per- lxs. I32 ix newXSproto Used by "xsubpp" to hook up XSUBs as Perl subs. Adds Perl prototypes to the subs. RETVAL Variable which is setup by "xsubpp" to hold the return value for an XSUB. This is always the proper type for the XSUB. See "The RETVAL Variable" in perlxs. (whatever) RETVAL ST Used to access elements on the XSUB's stack. SV* ST(int ix) THIS Variable which is setup by "xsubpp" to designate the object in a C++ XSUB. This is always the proper type for the C++ object. See "CLASS" and "Using XS With C++" in perlxs. (whatever) THIS UNDERBAR The SV* corresponding to the $_ variable. Works even if there is a lexical $_ in scope. (Lexical $_ is available in perl 5.9.2 and later) XS Macro to declare an XSUB and its C parameter list. This is handled by "xsubpp". XS_VERSION The version identifier for an XS module. This is usually handled automatically by "ExtUtils::MakeMaker". See "XS_VER- SION_BOOTCHECK". XS_VERSION_BOOTCHECK Macro to verify that a PM module's $VERSION variable matches the XS module's "XS_VERSION" variable. This is usually handled auto- matically by "xsubpp". See "The VERSIONCHECK: Keyword" in perlxs. XS_VERSION_BOOTCHECK; Warning and Dieing croak This is the XSUB-writer's interface to Perl's "die" function. Normally call this function the same way you call the C "printf" function. Calling "croak" returns control directly to Perl, sidestepping the normal C order of execution. See "warn". If you want to throw an exception object, assign the object to $@ and then pass "NULL" to croak(): errsv = get_sv("@", TRUE); sv_setsv(errsv, exception_object); croak(NULL); void croak(const char* pat, ...) warn This is the XSUB-writer's interface to Perl's "warn" function. Call this function the same way you call the C "printf" function. See "croak". void warn(const char* pat, ...)AUTHORSUntil May 1997, this document was maintained by Jeff Okamoto <okamoto@corp.hp.com>. It is now maintained as part of Perl itself. With lots of help and suggestions from Dean Roehrich, Malcolm Beattie, Andreas Koenig, Paul Hudson, Ilya Zakharevich, Paul Marquess, Neil Bowers, Matthew Green, Tim Bunce, Spider Boardman, Ulrich Pfeifer, Stephen McCamant, and Gurusamy Sarathy. API Listing originally by Dean Roehrich <roehrich@cray.com>. Updated to be autogenerated from comments in the source by Benjamin Stuhl.SEE ALSOperlguts(1), perlxs(1), perlxstut(1), perlintern(1) perl v5.8.9 2007-11-17 PERLAPI(1)