forked from schacon/perl
/
mg.c
2720 lines (2498 loc) · 60 KB
/
mg.c
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/* mg.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
* 2000, 2001, 2002, 2003, 2004, 2005 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* "Sam sat on the ground and put his head in his hands. 'I wish I had never
* come here, and I don't want to see no more magic,' he said, and fell silent."
*/
/*
=head1 Magical Functions
"Magic" is special data attached to SV structures in order to give them
"magical" properties. When any Perl code tries to read from, or assign to,
an SV marked as magical, it calls the 'get' or 'set' function associated
with that SV's magic. A get is called prior to reading an SV, in order to
give it a chance to update its internal value (get on $. writes the line
number of the last read filehandle into to the SV's IV slot), while
set is called after an SV has been written to, in order to allow it to make
use of its changed value (set on $/ copies the SV's new value to the
PL_rs global variable).
Magic is implemented as a linked list of MAGIC structures attached to the
SV. Each MAGIC struct holds the type of the magic, a pointer to an array
of functions that implement the get(), set(), length() etc functions,
plus space for some flags and pointers. For example, a tied variable has
a MAGIC structure that contains a pointer to the object associated with the
tie.
*/
#include "EXTERN.h"
#define PERL_IN_MG_C
#include "perl.h"
#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
# ifndef NGROUPS
# define NGROUPS 32
# endif
# ifdef I_GRP
# include <grp.h>
# endif
#endif
#ifdef __hpux
# include <sys/pstat.h>
#endif
Signal_t Perl_csighandler(int sig);
/* if you only have signal() and it resets on each signal, FAKE_PERSISTENT_SIGNAL_HANDLERS fixes */
#if !defined(HAS_SIGACTION) && defined(VMS)
# define FAKE_PERSISTENT_SIGNAL_HANDLERS
#endif
/* if we're doing kill() with sys$sigprc on VMS, FAKE_DEFAULT_SIGNAL_HANDLERS */
#if defined(KILL_BY_SIGPRC)
# define FAKE_DEFAULT_SIGNAL_HANDLERS
#endif
static void restore_magic(pTHX_ const void *p);
static void unwind_handler_stack(pTHX_ const void *p);
#ifdef __Lynx__
/* Missing protos on LynxOS */
void setruid(uid_t id);
void seteuid(uid_t id);
void setrgid(uid_t id);
void setegid(uid_t id);
#endif
/*
* Use the "DESTRUCTOR" scope cleanup to reinstate magic.
*/
struct magic_state {
SV* mgs_sv;
U32 mgs_flags;
I32 mgs_ss_ix;
};
/* MGS is typedef'ed to struct magic_state in perl.h */
STATIC void
S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
{
MGS* mgs;
assert(SvMAGICAL(sv));
#ifdef PERL_COPY_ON_WRITE
/* Turning READONLY off for a copy-on-write scalar is a bad idea. */
if (SvIsCOW(sv))
sv_force_normal(sv);
#endif
SAVEDESTRUCTOR_X(restore_magic, INT2PTR(void*, (IV)mgs_ix));
mgs = SSPTR(mgs_ix, MGS*);
mgs->mgs_sv = sv;
mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
SvMAGICAL_off(sv);
SvREADONLY_off(sv);
SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_NOK|SVp_POK)) >> PRIVSHIFT;
}
/*
=for apidoc mg_magical
Turns on the magical status of an SV. See C<sv_magic>.
=cut
*/
void
Perl_mg_magical(pTHX_ SV *sv)
{
const MAGIC* mg;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
const MGVTBL* const vtbl = mg->mg_virtual;
if (vtbl) {
if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
SvGMAGICAL_on(sv);
if (vtbl->svt_set)
SvSMAGICAL_on(sv);
if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)) || vtbl->svt_clear)
SvRMAGICAL_on(sv);
}
}
}
/*
=for apidoc mg_get
Do magic after a value is retrieved from the SV. See C<sv_magic>.
=cut
*/
int
Perl_mg_get(pTHX_ SV *sv)
{
const I32 mgs_ix = SSNEW(sizeof(MGS));
const bool was_temp = (bool)SvTEMP(sv);
int new = 0;
MAGIC *newmg, *head, *cur, *mg;
/* guard against sv having being freed midway by holding a private
reference. */
/* sv_2mortal has this side effect of turning on the TEMP flag, which can
cause the SV's buffer to get stolen (and maybe other stuff).
So restore it.
*/
sv_2mortal(SvREFCNT_inc(sv));
if (!was_temp) {
SvTEMP_off(sv);
}
save_magic(mgs_ix, sv);
/* We must call svt_get(sv, mg) for each valid entry in the linked
list of magic. svt_get() may delete the current entry, add new
magic to the head of the list, or upgrade the SV. AMS 20010810 */
newmg = cur = head = mg = SvMAGIC(sv);
while (mg) {
const MGVTBL * const vtbl = mg->mg_virtual;
if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg);
/* guard against magic having been deleted - eg FETCH calling
* untie */
if (!SvMAGIC(sv))
break;
/* Don't restore the flags for this entry if it was deleted. */
if (mg->mg_flags & MGf_GSKIP)
(SSPTR(mgs_ix, MGS *))->mgs_flags = 0;
}
mg = mg->mg_moremagic;
if (new) {
/* Have we finished with the new entries we saw? Start again
where we left off (unless there are more new entries). */
if (mg == head) {
new = 0;
mg = cur;
head = newmg;
}
}
/* Were any new entries added? */
if (!new && (newmg = SvMAGIC(sv)) != head) {
new = 1;
cur = mg;
mg = newmg;
}
}
restore_magic(aTHX_ INT2PTR(void *, (IV)mgs_ix));
if (SvREFCNT(sv) == 1) {
/* We hold the last reference to this SV, which implies that the
SV was deleted as a side effect of the routines we called. */
SvOK_off(sv);
}
return 0;
}
/*
=for apidoc mg_set
Do magic after a value is assigned to the SV. See C<sv_magic>.
=cut
*/
int
Perl_mg_set(pTHX_ SV *sv)
{
const I32 mgs_ix = SSNEW(sizeof(MGS));
MAGIC* mg;
MAGIC* nextmg;
save_magic(mgs_ix, sv);
for (mg = SvMAGIC(sv); mg; mg = nextmg) {
const MGVTBL* vtbl = mg->mg_virtual;
nextmg = mg->mg_moremagic; /* it may delete itself */
if (mg->mg_flags & MGf_GSKIP) {
mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
(SSPTR(mgs_ix, MGS*))->mgs_flags = 0;
}
if (vtbl && vtbl->svt_set)
CALL_FPTR(vtbl->svt_set)(aTHX_ sv, mg);
}
restore_magic(aTHX_ INT2PTR(void*, (IV)mgs_ix));
return 0;
}
/*
=for apidoc mg_length
Report on the SV's length. See C<sv_magic>.
=cut
*/
U32
Perl_mg_length(pTHX_ SV *sv)
{
MAGIC* mg;
STRLEN len;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
const MGVTBL * const vtbl = mg->mg_virtual;
if (vtbl && vtbl->svt_len) {
const I32 mgs_ix = SSNEW(sizeof(MGS));
save_magic(mgs_ix, sv);
/* omit MGf_GSKIP -- not changed here */
len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
restore_magic(aTHX_ INT2PTR(void*, (IV)mgs_ix));
return len;
}
}
if (DO_UTF8(sv)) {
U8 *s = (U8*)SvPV(sv, len);
len = Perl_utf8_length(aTHX_ s, s + len);
}
else
(void)SvPV(sv, len);
return len;
}
I32
Perl_mg_size(pTHX_ SV *sv)
{
MAGIC* mg;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
const MGVTBL* const vtbl = mg->mg_virtual;
if (vtbl && vtbl->svt_len) {
const I32 mgs_ix = SSNEW(sizeof(MGS));
I32 len;
save_magic(mgs_ix, sv);
/* omit MGf_GSKIP -- not changed here */
len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
restore_magic(aTHX_ INT2PTR(void*, (IV)mgs_ix));
return len;
}
}
switch(SvTYPE(sv)) {
case SVt_PVAV:
return AvFILLp((AV *) sv); /* Fallback to non-tied array */
case SVt_PVHV:
/* FIXME */
default:
Perl_croak(aTHX_ "Size magic not implemented");
break;
}
return 0;
}
/*
=for apidoc mg_clear
Clear something magical that the SV represents. See C<sv_magic>.
=cut
*/
int
Perl_mg_clear(pTHX_ SV *sv)
{
const I32 mgs_ix = SSNEW(sizeof(MGS));
MAGIC* mg;
save_magic(mgs_ix, sv);
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
const MGVTBL* const vtbl = mg->mg_virtual;
/* omit GSKIP -- never set here */
if (vtbl && vtbl->svt_clear)
CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
}
restore_magic(aTHX_ INT2PTR(void*, (IV)mgs_ix));
return 0;
}
/*
=for apidoc mg_find
Finds the magic pointer for type matching the SV. See C<sv_magic>.
=cut
*/
MAGIC*
Perl_mg_find(pTHX_ const SV *sv, int type)
{
if (sv) {
MAGIC *mg;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
if (mg->mg_type == type)
return mg;
}
}
return 0;
}
/*
=for apidoc mg_copy
Copies the magic from one SV to another. See C<sv_magic>.
=cut
*/
int
Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
{
int count = 0;
MAGIC* mg;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
const MGVTBL* const vtbl = mg->mg_virtual;
if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
}
else if (isUPPER(mg->mg_type)) {
sv_magic(nsv,
mg->mg_type == PERL_MAGIC_tied ? SvTIED_obj(sv, mg) :
(mg->mg_type == PERL_MAGIC_regdata && mg->mg_obj)
? sv : mg->mg_obj,
toLOWER(mg->mg_type), key, klen);
count++;
}
}
return count;
}
/*
=for apidoc mg_free
Free any magic storage used by the SV. See C<sv_magic>.
=cut
*/
int
Perl_mg_free(pTHX_ SV *sv)
{
MAGIC* mg;
MAGIC* moremagic;
for (mg = SvMAGIC(sv); mg; mg = moremagic) {
const MGVTBL* const vtbl = mg->mg_virtual;
moremagic = mg->mg_moremagic;
if (vtbl && vtbl->svt_free)
CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
Safefree(mg->mg_ptr);
else if (mg->mg_len == HEf_SVKEY)
SvREFCNT_dec((SV*)mg->mg_ptr);
}
if (mg->mg_flags & MGf_REFCOUNTED)
SvREFCNT_dec(mg->mg_obj);
Safefree(mg);
}
SvMAGIC(sv) = 0;
return 0;
}
#include <signal.h>
U32
Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
{
register const REGEXP *rx;
(void)sv;
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
if (mg->mg_obj) /* @+ */
return rx->nparens;
else /* @- */
return rx->lastparen;
}
return (U32)-1;
}
int
Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
{
register REGEXP *rx;
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
register const I32 paren = mg->mg_len;
register I32 s;
register I32 t;
if (paren < 0)
return 0;
if (paren <= (I32)rx->nparens &&
(s = rx->startp[paren]) != -1 &&
(t = rx->endp[paren]) != -1)
{
register I32 i;
if (mg->mg_obj) /* @+ */
i = t;
else /* @- */
i = s;
if (i > 0 && RX_MATCH_UTF8(rx)) {
char *b = rx->subbeg;
if (b)
i = Perl_utf8_length(aTHX_ (U8*)b, (U8*)(b+i));
}
sv_setiv(sv, i);
}
}
return 0;
}
int
Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
{
(void)sv; (void)mg;
Perl_croak(aTHX_ PL_no_modify);
/* NOT REACHED */
#ifndef HASATTRIBUTE
/* No __attribute__, so the compiler doesn't know that croak never returns
*/
return 0;
#endif
}
U32
Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
{
register I32 paren;
register I32 i;
register const REGEXP *rx;
I32 s1, t1;
switch (*mg->mg_ptr) {
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9': case '&':
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
paren = atoi(mg->mg_ptr); /* $& is in [0] */
getparen:
if (paren <= (I32)rx->nparens &&
(s1 = rx->startp[paren]) != -1 &&
(t1 = rx->endp[paren]) != -1)
{
i = t1 - s1;
getlen:
if (i > 0 && RX_MATCH_UTF8(rx)) {
char *s = rx->subbeg + s1;
char *send = rx->subbeg + t1;
i = t1 - s1;
if (is_utf8_string((U8*)s, i))
i = Perl_utf8_length(aTHX_ (U8*)s, (U8*)send);
}
if (i < 0)
Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
return i;
}
else {
if (ckWARN(WARN_UNINITIALIZED))
report_uninit(sv);
}
}
else {
if (ckWARN(WARN_UNINITIALIZED))
report_uninit(sv);
}
return 0;
case '+':
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
paren = rx->lastparen;
if (paren)
goto getparen;
}
return 0;
case '\016': /* ^N */
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
paren = rx->lastcloseparen;
if (paren)
goto getparen;
}
return 0;
case '`':
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
if (rx->startp[0] != -1) {
i = rx->startp[0];
if (i > 0) {
s1 = 0;
t1 = i;
goto getlen;
}
}
}
return 0;
case '\'':
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
if (rx->endp[0] != -1) {
i = rx->sublen - rx->endp[0];
if (i > 0) {
s1 = rx->endp[0];
t1 = rx->sublen;
goto getlen;
}
}
}
return 0;
}
magic_get(sv,mg);
if (!SvPOK(sv) && SvNIOK(sv)) {
STRLEN n_a;
sv_2pv(sv, &n_a);
}
if (SvPOK(sv))
return SvCUR(sv);
return 0;
}
int
Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
{
register I32 paren;
register char *s = NULL;
register I32 i;
register REGEXP *rx;
switch (*mg->mg_ptr) {
case '\001': /* ^A */
sv_setsv(sv, PL_bodytarget);
break;
case '\003': /* ^C */
sv_setiv(sv, (IV)PL_minus_c);
break;
case '\004': /* ^D */
sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
break;
case '\005': /* ^E */
if (*(mg->mg_ptr+1) == '\0') {
#ifdef MACOS_TRADITIONAL
{
char msg[256];
sv_setnv(sv,(double)gMacPerl_OSErr);
sv_setpv(sv, gMacPerl_OSErr ? GetSysErrText(gMacPerl_OSErr, msg) : "");
}
#else
#ifdef VMS
{
# include <descrip.h>
# include <starlet.h>
char msg[255];
$DESCRIPTOR(msgdsc,msg);
sv_setnv(sv,(NV) vaxc$errno);
if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
else
sv_setpv(sv,"");
}
#else
#ifdef OS2
if (!(_emx_env & 0x200)) { /* Under DOS */
sv_setnv(sv, (NV)errno);
sv_setpv(sv, errno ? Strerror(errno) : "");
} else {
if (errno != errno_isOS2) {
int tmp = _syserrno();
if (tmp) /* 2nd call to _syserrno() makes it 0 */
Perl_rc = tmp;
}
sv_setnv(sv, (NV)Perl_rc);
sv_setpv(sv, os2error(Perl_rc));
}
#else
#ifdef WIN32
{
DWORD dwErr = GetLastError();
sv_setnv(sv, (NV)dwErr);
if (dwErr)
{
PerlProc_GetOSError(sv, dwErr);
}
else
sv_setpv(sv, "");
SetLastError(dwErr);
}
#else
{
int saveerrno = errno;
sv_setnv(sv, (NV)errno);
sv_setpv(sv, errno ? Strerror(errno) : "");
errno = saveerrno;
}
#endif
#endif
#endif
#endif
SvNOK_on(sv); /* what a wonderful hack! */
}
else if (strEQ(mg->mg_ptr+1, "NCODING"))
sv_setsv(sv, PL_encoding);
break;
case '\006': /* ^F */
sv_setiv(sv, (IV)PL_maxsysfd);
break;
case '\010': /* ^H */
sv_setiv(sv, (IV)PL_hints);
break;
case '\011': /* ^I */ /* NOT \t in EBCDIC */
if (PL_inplace)
sv_setpv(sv, PL_inplace);
else
sv_setsv(sv, &PL_sv_undef);
break;
case '\017': /* ^O & ^OPEN */
if (*(mg->mg_ptr+1) == '\0') {
sv_setpv(sv, PL_osname);
SvTAINTED_off(sv);
}
else if (strEQ(mg->mg_ptr, "\017PEN")) {
if (!PL_compiling.cop_io)
sv_setsv(sv, &PL_sv_undef);
else {
sv_setsv(sv, PL_compiling.cop_io);
}
}
break;
case '\020': /* ^P */
sv_setiv(sv, (IV)PL_perldb);
break;
case '\023': /* ^S */
if (*(mg->mg_ptr+1) == '\0') {
if (PL_lex_state != LEX_NOTPARSING)
SvOK_off(sv);
else if (PL_in_eval)
sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
else
sv_setiv(sv, 0);
}
break;
case '\024': /* ^T */
if (*(mg->mg_ptr+1) == '\0') {
#ifdef BIG_TIME
sv_setnv(sv, PL_basetime);
#else
sv_setiv(sv, (IV)PL_basetime);
#endif
}
else if (strEQ(mg->mg_ptr, "\024AINT"))
sv_setiv(sv, PL_tainting
? (PL_taint_warn || PL_unsafe ? -1 : 1)
: 0);
break;
case '\025': /* $^UNICODE, $^UTF8LOCALE */
if (strEQ(mg->mg_ptr, "\025NICODE"))
sv_setuv(sv, (UV) PL_unicode);
else if (strEQ(mg->mg_ptr, "\025TF8LOCALE"))
sv_setuv(sv, (UV) PL_utf8locale);
break;
case '\027': /* ^W & $^WARNING_BITS */
if (*(mg->mg_ptr+1) == '\0')
sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
if (PL_compiling.cop_warnings == pWARN_NONE ||
PL_compiling.cop_warnings == pWARN_STD)
{
sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
}
else if (PL_compiling.cop_warnings == pWARN_ALL) {
/* Get the bit mask for $warnings::Bits{all}, because
* it could have been extended by warnings::register */
SV **bits_all;
HV *bits=get_hv("warnings::Bits", FALSE);
if (bits && (bits_all=hv_fetch(bits, "all", 3, FALSE))) {
sv_setsv(sv, *bits_all);
}
else {
sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
}
}
else {
sv_setsv(sv, PL_compiling.cop_warnings);
}
SvPOK_only(sv);
}
break;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9': case '&':
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
I32 s1, t1;
/*
* Pre-threads, this was paren = atoi(GvENAME((GV*)mg->mg_obj));
* XXX Does the new way break anything?
*/
paren = atoi(mg->mg_ptr); /* $& is in [0] */
getparen:
if (paren <= (I32)rx->nparens &&
(s1 = rx->startp[paren]) != -1 &&
(t1 = rx->endp[paren]) != -1)
{
i = t1 - s1;
s = rx->subbeg + s1;
if (!rx->subbeg)
break;
getrx:
if (i >= 0) {
sv_setpvn(sv, s, i);
if (RX_MATCH_UTF8(rx) && is_utf8_string((U8*)s, i))
SvUTF8_on(sv);
else
SvUTF8_off(sv);
if (PL_tainting) {
if (RX_MATCH_TAINTED(rx)) {
MAGIC* mg = SvMAGIC(sv);
MAGIC* mgt;
PL_tainted = 1;
SvMAGIC(sv) = mg->mg_moremagic;
SvTAINT(sv);
if ((mgt = SvMAGIC(sv))) {
mg->mg_moremagic = mgt;
SvMAGIC(sv) = mg;
}
} else
SvTAINTED_off(sv);
}
break;
}
}
}
sv_setsv(sv,&PL_sv_undef);
break;
case '+':
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
paren = rx->lastparen;
if (paren)
goto getparen;
}
sv_setsv(sv,&PL_sv_undef);
break;
case '\016': /* ^N */
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
paren = rx->lastcloseparen;
if (paren)
goto getparen;
}
sv_setsv(sv,&PL_sv_undef);
break;
case '`':
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
if ((s = rx->subbeg) && rx->startp[0] != -1) {
i = rx->startp[0];
goto getrx;
}
}
sv_setsv(sv,&PL_sv_undef);
break;
case '\'':
if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
if (rx->subbeg && rx->endp[0] != -1) {
s = rx->subbeg + rx->endp[0];
i = rx->sublen - rx->endp[0];
goto getrx;
}
}
sv_setsv(sv,&PL_sv_undef);
break;
case '.':
#ifndef lint
if (GvIO(PL_last_in_gv)) {
sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
}
#endif
break;
case '?':
{
sv_setiv(sv, (IV)STATUS_CURRENT);
#ifdef COMPLEX_STATUS
LvTARGOFF(sv) = PL_statusvalue;
LvTARGLEN(sv) = PL_statusvalue_vms;
#endif
}
break;
case '^':
if (GvIOp(PL_defoutgv))
s = IoTOP_NAME(GvIOp(PL_defoutgv));
if (s)
sv_setpv(sv,s);
else {
sv_setpv(sv,GvENAME(PL_defoutgv));
sv_catpv(sv,"_TOP");
}
break;
case '~':
if (GvIOp(PL_defoutgv))
s = IoFMT_NAME(GvIOp(PL_defoutgv));
if (!s)
s = GvENAME(PL_defoutgv);
sv_setpv(sv,s);
break;
#ifndef lint
case '=':
if (GvIOp(PL_defoutgv))
sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
break;
case '-':
if (GvIOp(PL_defoutgv))
sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
break;
case '%':
if (GvIOp(PL_defoutgv))
sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
break;
#endif
case ':':
break;
case '/':
break;
case '[':
WITH_THR(sv_setiv(sv, (IV)PL_curcop->cop_arybase));
break;
case '|':
if (GvIOp(PL_defoutgv))
sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
break;
case ',':
break;
case '\\':
if (PL_ors_sv)
sv_copypv(sv, PL_ors_sv);
break;
case '#':
sv_setpv(sv,PL_ofmt);
break;
case '!':
#ifdef VMS
sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
sv_setpv(sv, errno ? Strerror(errno) : "");
#else
{
int saveerrno = errno;
sv_setnv(sv, (NV)errno);
#ifdef OS2
if (errno == errno_isOS2 || errno == errno_isOS2_set)
sv_setpv(sv, os2error(Perl_rc));
else
#endif
sv_setpv(sv, errno ? Strerror(errno) : "");
errno = saveerrno;
}
#endif
SvNOK_on(sv); /* what a wonderful hack! */
break;
case '<':
sv_setiv(sv, (IV)PL_uid);
break;
case '>':
sv_setiv(sv, (IV)PL_euid);
break;
case '(':
sv_setiv(sv, (IV)PL_gid);
#ifdef HAS_GETGROUPS
Perl_sv_setpvf(aTHX_ sv, "%"Gid_t_f, PL_gid);
#endif
goto add_groups;
case ')':
sv_setiv(sv, (IV)PL_egid);
#ifdef HAS_GETGROUPS
Perl_sv_setpvf(aTHX_ sv, "%"Gid_t_f, PL_egid);
#endif
add_groups:
#ifdef HAS_GETGROUPS
{
Groups_t gary[NGROUPS];
i = getgroups(NGROUPS,gary);
while (--i >= 0)
Perl_sv_catpvf(aTHX_ sv, " %"Gid_t_f, gary[i]);
}
#endif
(void)SvIOK_on(sv); /* what a wonderful hack! */
break;
#ifndef MACOS_TRADITIONAL
case '0':
break;
#endif
}
return 0;
}
int
Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
{
struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
if (uf && uf->uf_val)
(*uf->uf_val)(aTHX_ uf->uf_index, sv);
return 0;
}
int
Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
{
register char *s;
char *ptr;
STRLEN len, klen;
s = SvPV(sv,len);
ptr = MgPV(mg,klen);
my_setenv(ptr, s);
#ifdef DYNAMIC_ENV_FETCH
/* We just undefd an environment var. Is a replacement */
/* waiting in the wings? */
if (!len) {
SV **valp;
if ((valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE)))
s = SvPV(*valp, len);
}
#endif
#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
/* And you'll never guess what the dog had */
/* in its mouth... */
if (PL_tainting) {
MgTAINTEDDIR_off(mg);
#ifdef VMS
if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
char pathbuf[256], eltbuf[256], *cp, *elt = s;
Stat_t sbuf;
int i = 0, j = 0;
do { /* DCL$PATH may be a search list */
while (1) { /* as may dev portion of any element */
if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
if ( *(cp+1) == '.' || *(cp+1) == '-' ||
cando_by_name(S_IWUSR,0,elt) ) {
MgTAINTEDDIR_on(mg);
return 0;