/* mg.c * * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, * 2000, 2001, 2002, 2003, 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 */ #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 # endif #endif #ifdef __hpux # include #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_ void *p); static void unwind_handler_stack(pTHX_ void *p); /* * 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. =cut */ void Perl_mg_magical(pTHX_ SV *sv) { MAGIC* mg; for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { MGVTBL* 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. =cut */ int Perl_mg_get(pTHX_ SV *sv) { int new = 0; MAGIC *newmg, *head, *cur, *mg; I32 mgs_ix = SSNEW(sizeof(MGS)); 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) { MGVTBL *vtbl = mg->mg_virtual; if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) { CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg); /* guard against sv having been freed */ if (SvTYPE(sv) == SVTYPEMASK) { Perl_croak(aTHX_ "Tied variable freed while still in use"); } /* 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)); return 0; } /* =for apidoc mg_set Do magic after a value is assigned to the SV. See C. =cut */ int Perl_mg_set(pTHX_ SV *sv) { I32 mgs_ix; MAGIC* mg; MAGIC* nextmg; mgs_ix = SSNEW(sizeof(MGS)); save_magic(mgs_ix, sv); for (mg = SvMAGIC(sv); mg; mg = nextmg) { 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. =cut */ U32 Perl_mg_length(pTHX_ SV *sv) { MAGIC* mg; STRLEN len; for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { MGVTBL* vtbl = mg->mg_virtual; if (vtbl && vtbl->svt_len) { I32 mgs_ix; 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; I32 len; for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { MGVTBL* vtbl = mg->mg_virtual; if (vtbl && vtbl->svt_len) { I32 mgs_ix; 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; } } switch(SvTYPE(sv)) { case SVt_PVAV: len = AvFILLp((AV *) sv); /* Fallback to non-tied array */ return len; 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. =cut */ int Perl_mg_clear(pTHX_ SV *sv) { I32 mgs_ix; MAGIC* mg; mgs_ix = SSNEW(sizeof(MGS)); save_magic(mgs_ix, sv); for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { MGVTBL* 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. =cut */ MAGIC* Perl_mg_find(pTHX_ SV *sv, int type) { MAGIC* mg; if (!sv) return 0; 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. =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) { MGVTBL* 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. =cut */ int Perl_mg_free(pTHX_ SV *sv) { MAGIC* mg; MAGIC* moremagic; for (mg = SvMAGIC(sv); mg; mg = moremagic) { MGVTBL* 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) 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; } #if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX) #include #endif U32 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg) { register REGEXP *rx; 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 I32 paren; register I32 s; register I32 i; register REGEXP *rx; I32 t; if (PL_curpm && (rx = PM_GETRE(PL_curpm))) { paren = mg->mg_len; if (paren < 0) return 0; if (paren <= (I32)rx->nparens && (s = rx->startp[paren]) != -1 && (t = rx->endp[paren]) != -1) { 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) { Perl_croak(aTHX_ PL_no_modify); /* NOT REACHED */ return 0; } U32 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg) { register I32 paren; register I32 i; register 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(); } } else { if (ckWARN(WARN_UNINITIALIZED)) report_uninit(); } 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; 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)); #if defined(YYDEBUG) && defined(DEBUGGING) PL_yydebug = DEBUG_p_TEST; #endif 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 # include 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 sv_setnv(sv, (NV)errno); sv_setpv(sv, errno ? Strerror(errno) : ""); #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); 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) (void)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 */ if (strEQ(mg->mg_ptr, "\025NICODE")) sv_setuv(sv, (UV) PL_unicode); 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 '^': 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 '~': s = IoFMT_NAME(GvIOp(PL_defoutgv)); if (!s) s = GvENAME(PL_defoutgv); sv_setpv(sv,s); break; #ifndef lint case '=': sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv))); break; case '-': sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv))); break; case '%': 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 '|': 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; } } if ((cp = strchr(elt, ':')) != Nullch) *cp = '\0'; if (my_trnlnm(elt, eltbuf, j++)) elt = eltbuf; else break; } j = 0; } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf)); } #endif /* VMS */ if (s && klen == 4 && strEQ(ptr,"PATH")) { char *strend = s + len; while (s < strend) { char tmpbuf[256]; Stat_t st; I32 i; s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf, s, strend, ':', &i); s++; if (i >= sizeof tmpbuf /* too long -- assume the worst */ || *tmpbuf != '/' || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) { MgTAINTEDDIR_on(mg); return 0; } } } } #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */ return 0; } int Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg) { STRLEN n_a; my_setenv(MgPV(mg,n_a),Nullch); return 0; } int Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg) { #if defined(VMS) Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system"); #else if (PL_localizing) { HE* entry; STRLEN n_a; magic_clear_all_env(sv,mg); hv_iterinit((HV*)sv); while ((entry = hv_iternext((HV*)sv))) { I32 keylen; my_setenv(hv_iterkey(entry, &keylen), SvPV(hv_iterval((HV*)sv, entry), n_a)); } } #endif return 0; } int Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg) { #if defined(VMS) || defined(EPOC) Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system"); #else # if defined(PERL_IMPLICIT_SYS) || defined(WIN32) PerlEnv_clearenv(); # else # ifdef USE_ENVIRON_ARRAY # if defined(USE_ITHREADS) /* only the parent thread can clobber the process environment */ if (PL_curinterp == aTHX) # endif { # ifndef PERL_USE_SAFE_PUTENV I32 i; if (environ == PL_origenviron) environ = (char**)safesysmalloc(sizeof(char*)); else for (i = 0; environ[i]; i++) safesysfree(environ[i]); # endif /* PERL_USE_SAFE_PUTENV */ environ[0] = Nullch; } # endif /* USE_ENVIRON_ARRAY */ # endif /* PERL_IMPLICIT_SYS || WIN32 */ #endif /* VMS || EPC */ return 0; } #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS)||defined(FAKE_DEFAULT_SIGNAL_HANDLERS) static int sig_handlers_initted = 0; #endif #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS static int sig_ignoring[SIG_SIZE]; /* which signals we are ignoring */ #endif #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS static int sig_defaulting[SIG_SIZE]; #endif #ifndef PERL_MICRO #ifdef HAS_SIGPROCMASK static void restore_sigmask(pTHX_ SV *save_sv) { sigset_t *ossetp = (sigset_t *) SvPV_nolen( save_sv ); (void)sigprocmask(SIG_SETMASK, ossetp, (sigset_t *)0); } #endif int Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg) { I32 i; STRLEN n_a; /* Are we fetching a signal entry? */ i = whichsig(MgPV(mg,n_a)); if (i > 0) { if(PL_psig_ptr[i]) sv_setsv(sv,PL_psig_ptr[i]); else { Sighandler_t sigstate; sigstate = rsignal_state(i); #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS if (sig_handlers_initted && sig_ignoring[i]) sigstate = SIG_IGN; #endif #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS if (sig_handlers_initted && sig_defaulting[i]) sigstate = SIG_DFL; #endif /* cache state so we don't fetch it again */ if(sigstate == SIG_IGN) sv_setpv(sv,"IGNORE"); else sv_setsv(sv,&PL_sv_undef); PL_psig_ptr[i] = SvREFCNT_inc(sv); SvTEMP_off(sv); } } return 0; } int Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg) { /* XXX Some of this code was copied from Perl_magic_setsig. A little * refactoring might be in order. */ register char *s; STRLEN n_a; SV* to_dec; s = MgPV(mg,n_a); if (*s == '_') { SV** svp; if (strEQ(s,"__DIE__")) svp = &PL_diehook; else if (strEQ(s,"__WARN__")) svp = &PL_warnhook; else Perl_croak(aTHX_ "No such hook: %s", s); if (*svp) { to_dec = *svp; *svp = 0; SvREFCNT_dec(to_dec); } } else { I32 i; /* Are we clearing a signal entry? */ i = whichsig(s); if (i > 0) { #ifdef HAS_SIGPROCMASK sigset_t set, save; SV* save_sv; /* Avoid having the signal arrive at a bad time, if possible. */ sigemptyset(&set); sigaddset(&set,i); sigprocmask(SIG_BLOCK, &set, &save); ENTER; save_sv = newSVpv((char *)(&save), sizeof(sigset_t)); SAVEFREESV(save_sv); SAVEDESTRUCTOR_X(restore_sigmask, save_sv); #endif PERL_ASYNC_CHECK(); #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS) if (!sig_handlers_initted) Perl_csighandler_init(); #endif #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS sig_defaulting[i] = 1; (void)rsignal(i, &Perl_csighandler); #else (void)rsignal(i, SIG_DFL); #endif if(PL_psig_name[i]) { SvREFCNT_dec(PL_psig_name[i]); PL_psig_name[i]=0; } if(PL_psig_ptr[i]) { to_dec=PL_psig_ptr[i]; PL_psig_ptr[i]=0; LEAVE; SvREFCNT_dec(to_dec); } else LEAVE; } } return 0; } void Perl_raise_signal(pTHX_ int sig) { /* Set a flag to say this signal is pending */ PL_psig_pend[sig]++; /* And one to say _a_ signal is pending */ PL_sig_pending = 1; } Signal_t Perl_csighandler(int sig) { #ifdef PERL_GET_SIG_CONTEXT dTHXa(PERL_GET_SIG_CONTEXT); #else dTHX; #endif #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS (void) rsignal(sig, &Perl_csighandler); if (sig_ignoring[sig]) return; #endif #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS if (sig_defaulting[sig]) #ifdef KILL_BY_SIGPRC exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG); #else exit(1); #endif #endif if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) /* Call the perl level handler now-- * with risk we may be in malloc() etc. */ (*PL_sighandlerp)(sig); else Perl_raise_signal(aTHX_ sig); } #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS) void Perl_csighandler_init(void) { int sig; if (sig_handlers_initted) return; for (sig = 1; sig < SIG_SIZE; sig++) { #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS dTHX; sig_defaulting[sig] = 1; (void) rsignal(sig, &Perl_csighandler); #endif #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS sig_ignoring[sig] = 0; #endif } sig_handlers_initted = 1; } #endif void Perl_despatch_signals(pTHX) { int sig; PL_sig_pending = 0; for (sig = 1; sig < SIG_SIZE; sig++) { if (PL_psig_pend[sig]) { PERL_BLOCKSIG_ADD(set, sig); PL_psig_pend[sig] = 0; PERL_BLOCKSIG_BLOCK(set); (*PL_sighandlerp)(sig); PERL_BLOCKSIG_UNBLOCK(set); } } } int Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg) { register char *s; I32 i; SV** svp = 0; /* Need to be careful with SvREFCNT_dec(), because that can have side * effects (due to closures). We must make sure that the new disposition * is in place before it is called. */ SV* to_dec = 0; STRLEN len; #ifdef HAS_SIGPROCMASK sigset_t set, save; SV* save_sv; #endif s = MgPV(mg,len); if (*s == '_') { if (strEQ(s,"__DIE__")) svp = &PL_diehook; else if (strEQ(s,"__WARN__")) svp = &PL_warnhook; else Perl_croak(aTHX_ "No such hook: %s", s); i = 0; if (*svp) { to_dec = *svp; *svp = 0; } } else { i = whichsig(s); /* ...no, a brick */ if (i < 0) { if (ckWARN(WARN_SIGNAL)) Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s); return 0; } #ifdef HAS_SIGPROCMASK /* Avoid having the signal arrive at a bad time, if possible. */ sigemptyset(&set); sigaddset(&set,i); sigprocmask(SIG_BLOCK, &set, &save); ENTER; save_sv = newSVpv((char *)(&save), sizeof(sigset_t)); SAVEFREESV(save_sv); SAVEDESTRUCTOR_X(restore_sigmask, save_sv); #endif PERL_ASYNC_CHECK(); #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS) if (!sig_handlers_initted) Perl_csighandler_init(); #endif #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS sig_ignoring[i] = 0; #endif #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS sig_defaulting[i] = 0; #endif SvREFCNT_dec(PL_psig_name[i]); to_dec = PL_psig_ptr[i]; PL_psig_ptr[i] = SvREFCNT_inc(sv); SvTEMP_off(sv); /* Make sure it doesn't go away on us */ PL_psig_name[i] = newSVpvn(s, len); SvREADONLY_on(PL_psig_name[i]); } if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) { if (i) { (void)rsignal(i, &Perl_csighandler); #ifdef HAS_SIGPROCMASK LEAVE; #endif } else *svp = SvREFCNT_inc(sv); if(to_dec) SvREFCNT_dec(to_dec); return 0; } s = SvPV_force(sv,len); if (strEQ(s,"IGNORE")) { if (i) { #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS sig_ignoring[i] = 1; (void)rsignal(i, &Perl_csighandler); #else (void)rsignal(i, SIG_IGN); #endif } } else if (strEQ(s,"DEFAULT") || !*s) { if (i) #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS { sig_defaulting[i] = 1; (void)rsignal(i, &Perl_csighandler); } #else (void)rsignal(i, SIG_DFL); #endif } else { /* * We should warn if HINT_STRICT_REFS, but without * access to a known hint bit in a known OP, we can't * tell whether HINT_STRICT_REFS is in force or not. */ if (!strchr(s,':') && !strchr(s,'\'')) sv_insert(sv, 0, 0, "main::", 6); if (i) (void)rsignal(i, &Perl_csighandler); else *svp = SvREFCNT_inc(sv); } #ifdef HAS_SIGPROCMASK if(i) LEAVE; #endif if(to_dec) SvREFCNT_dec(to_dec); return 0; } #endif /* !PERL_MICRO */ int Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg) { PL_sub_generation++; return 0; } int Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg) { /* HV_badAMAGIC_on(Sv_STASH(sv)); */ PL_amagic_generation++; return 0; } int Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg) { HV *hv = (HV*)LvTARG(sv); I32 i = 0; if (hv) { (void) hv_iterinit(hv); if (! SvTIED_mg((SV*)hv, PERL_MAGIC_tied)) i = HvKEYS(hv); else { while (hv_iternext(hv)) i++; } } sv_setiv(sv, (IV)i); return 0; } int Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg) { if (LvTARG(sv)) { hv_ksplit((HV*)LvTARG(sv), SvIV(sv)); } return 0; } /* caller is responsible for stack switching/cleanup */ STATIC int S_magic_methcall(pTHX_ SV *sv, MAGIC *mg, char *meth, I32 flags, int n, SV *val) { dSP; PUSHMARK(SP); EXTEND(SP, n); PUSHs(SvTIED_obj(sv, mg)); if (n > 1) { if (mg->mg_ptr) { if (mg->mg_len >= 0) PUSHs(sv_2mortal(newSVpvn(mg->mg_ptr, mg->mg_len))); else if (mg->mg_len == HEf_SVKEY) PUSHs((SV*)mg->mg_ptr); } else if (mg->mg_type == PERL_MAGIC_tiedelem) { PUSHs(sv_2mortal(newSViv(mg->mg_len))); } } if (n > 2) { PUSHs(val); } PUTBACK; return call_method(meth, flags); } STATIC int S_magic_methpack(pTHX_ SV *sv, MAGIC *mg, char *meth) { dSP; ENTER; SAVETMPS; PUSHSTACKi(PERLSI_MAGIC); if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) { sv_setsv(sv, *PL_stack_sp--); } POPSTACK; FREETMPS; LEAVE; return 0; } int Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg) { magic_methpack(sv,mg,"FETCH"); if (mg->mg_ptr) mg->mg_flags |= MGf_GSKIP; return 0; } int Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg) { dSP; ENTER; PUSHSTACKi(PERLSI_MAGIC); magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv); POPSTACK; LEAVE; return 0; } int Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg) { return magic_methpack(sv,mg,"DELETE"); } U32 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg) { dSP; U32 retval = 0; ENTER; SAVETMPS; PUSHSTACKi(PERLSI_MAGIC); if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) { sv = *PL_stack_sp--; retval = (U32) SvIV(sv)-1; } POPSTACK; FREETMPS; LEAVE; return retval; } int Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg) { dSP; ENTER; PUSHSTACKi(PERLSI_MAGIC); PUSHMARK(SP); XPUSHs(SvTIED_obj(sv, mg)); PUTBACK; call_method("CLEAR", G_SCALAR|G_DISCARD); POPSTACK; LEAVE; return 0; } int Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key) { dSP; const char *meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY"; ENTER; SAVETMPS; PUSHSTACKi(PERLSI_MAGIC); PUSHMARK(SP); EXTEND(SP, 2); PUSHs(SvTIED_obj(sv, mg)); if (SvOK(key)) PUSHs(key); PUTBACK; if (call_method(meth, G_SCALAR)) sv_setsv(key, *PL_stack_sp--); POPSTACK; FREETMPS; LEAVE; return 0; } int Perl_magic_existspack(pTHX_ SV *sv, MAGIC *mg) { return magic_methpack(sv,mg,"EXISTS"); } int Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg) { OP *o; I32 i; GV* gv; SV** svp; STRLEN n_a; gv = PL_DBline; i = SvTRUE(sv); svp = av_fetch(GvAV(gv), atoi(MgPV(mg,n_a)), FALSE); if (svp && SvIOKp(*svp) && (o = INT2PTR(OP*,SvIVX(*svp)))) { /* set or clear breakpoint in the relevant control op */ if (i) o->op_flags |= OPf_SPECIAL; else o->op_flags &= ~OPf_SPECIAL; } return 0; } int Perl_magic_getarylen(pTHX_ SV *sv, MAGIC *mg) { sv_setiv(sv, AvFILL((AV*)mg->mg_obj) + PL_curcop->cop_arybase); return 0; } int Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg) { av_fill((AV*)mg->mg_obj, SvIV(sv) - PL_curcop->cop_arybase); return 0; } int Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg) { SV* lsv = LvTARG(sv); if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) { mg = mg_find(lsv, PERL_MAGIC_regex_global); if (mg && mg->mg_len >= 0) { I32 i = mg->mg_len; if (DO_UTF8(lsv)) sv_pos_b2u(lsv, &i); sv_setiv(sv, i + PL_curcop->cop_arybase); return 0; } } (void)SvOK_off(sv); return 0; } int Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg) { SV* lsv = LvTARG(sv); SSize_t pos; STRLEN len; STRLEN ulen = 0; mg = 0; if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) mg = mg_find(lsv, PERL_MAGIC_regex_global); if (!mg) { if (!SvOK(sv)) return 0; sv_magic(lsv, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0); mg = mg_find(lsv, PERL_MAGIC_regex_global); } else if (!SvOK(sv)) { mg->mg_len = -1; return 0; } len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv); pos = SvIV(sv) - PL_curcop->cop_arybase; if (DO_UTF8(lsv)) { ulen = sv_len_utf8(lsv); if (ulen) len = ulen; } if (pos < 0) { pos += len; if (pos < 0) pos = 0; } else if (pos > (SSize_t)len) pos = len; if (ulen) { I32 p = pos; sv_pos_u2b(lsv, &p, 0); pos = p; } mg->mg_len = pos; mg->mg_flags &= ~MGf_MINMATCH; return 0; } int Perl_magic_getglob(pTHX_ SV *sv, MAGIC *mg) { if (SvFAKE(sv)) { /* FAKE globs can get coerced */ SvFAKE_off(sv); gv_efullname3(sv,((GV*)sv), "*"); SvFAKE_on(sv); } else gv_efullname3(sv,((GV*)sv), "*"); /* a gv value, be nice */ return 0; } int Perl_magic_setglob(pTHX_ SV *sv, MAGIC *mg) { register char *s; GV* gv; STRLEN n_a; if (!SvOK(sv)) return 0; s = SvPV(sv, n_a); if (*s == '*' && s[1]) s++; gv = gv_fetchpv(s,TRUE, SVt_PVGV); if (sv == (SV*)gv) return 0; if (GvGP(sv)) gp_free((GV*)sv); GvGP(sv) = gp_ref(GvGP(gv)); return 0; } int Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg) { STRLEN len; SV *lsv = LvTARG(sv); char *tmps = SvPV(lsv,len); I32 offs = LvTARGOFF(sv); I32 rem = LvTARGLEN(sv); if (SvUTF8(lsv)) sv_pos_u2b(lsv, &offs, &rem); if (offs > (I32)len) offs = len; if (rem + offs > (I32)len) rem = len - offs; sv_setpvn(sv, tmps + offs, (STRLEN)rem); if (SvUTF8(lsv)) SvUTF8_on(sv); return 0; } int Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg) { STRLEN len; char *tmps = SvPV(sv, len); SV *lsv = LvTARG(sv); I32 lvoff = LvTARGOFF(sv); I32 lvlen = LvTARGLEN(sv); if (DO_UTF8(sv)) { sv_utf8_upgrade(lsv); sv_pos_u2b(lsv, &lvoff, &lvlen); sv_insert(lsv, lvoff, lvlen, tmps, len); SvUTF8_on(lsv); } else if (lsv && SvUTF8(lsv)) { sv_pos_u2b(lsv, &lvoff, &lvlen); tmps = (char*)bytes_to_utf8((U8*)tmps, &len); sv_insert(lsv, lvoff, lvlen, tmps, len); Safefree(tmps); } else sv_insert(lsv, lvoff, lvlen, tmps, len); return 0; } int Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg) { TAINT_IF((mg->mg_len & 1) || ((mg->mg_len & 2) && mg->mg_obj == sv)); /* kludge */ return 0; } int Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg) { if (PL_localizing) { if (PL_localizing == 1) mg->mg_len <<= 1; else mg->mg_len >>= 1; } else if (PL_tainted) mg->mg_len |= 1; else mg->mg_len &= ~1; return 0; } int Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg) { SV *lsv = LvTARG(sv); if (!lsv) { (void)SvOK_off(sv); return 0; } sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv))); return 0; } int Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg) { do_vecset(sv); /* XXX slurp this routine */ return 0; } int Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg) { SV *targ = Nullsv; if (LvTARGLEN(sv)) { if (mg->mg_obj) { SV *ahv = LvTARG(sv); HE *he = hv_fetch_ent((HV*)ahv, mg->mg_obj, FALSE, 0); if (he) targ = HeVAL(he); } else { AV* av = (AV*)LvTARG(sv); if ((I32)LvTARGOFF(sv) <= AvFILL(av)) targ = AvARRAY(av)[LvTARGOFF(sv)]; } if (targ && targ != &PL_sv_undef) { /* somebody else defined it for us */ SvREFCNT_dec(LvTARG(sv)); LvTARG(sv) = SvREFCNT_inc(targ); LvTARGLEN(sv) = 0; SvREFCNT_dec(mg->mg_obj); mg->mg_obj = Nullsv; mg->mg_flags &= ~MGf_REFCOUNTED; } } else targ = LvTARG(sv); sv_setsv(sv, targ ? targ : &PL_sv_undef); return 0; } int Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg) { if (LvTARGLEN(sv)) vivify_defelem(sv); if (LvTARG(sv)) { sv_setsv(LvTARG(sv), sv); SvSETMAGIC(LvTARG(sv)); } return 0; } void Perl_vivify_defelem(pTHX_ SV *sv) { MAGIC *mg; SV *value = Nullsv; if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem))) return; if (mg->mg_obj) { SV *ahv = LvTARG(sv); STRLEN n_a; HE *he = hv_fetch_ent((HV*)ahv, mg->mg_obj, TRUE, 0); if (he) value = HeVAL(he); if (!value || value == &PL_sv_undef) Perl_croak(aTHX_ PL_no_helem, SvPV(mg->mg_obj, n_a)); } else { AV* av = (AV*)LvTARG(sv); if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av)) LvTARG(sv) = Nullsv; /* array can't be extended */ else { SV** svp = av_fetch(av, LvTARGOFF(sv), TRUE); if (!svp || (value = *svp) == &PL_sv_undef) Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv)); } } (void)SvREFCNT_inc(value); SvREFCNT_dec(LvTARG(sv)); LvTARG(sv) = value; LvTARGLEN(sv) = 0; SvREFCNT_dec(mg->mg_obj); mg->mg_obj = Nullsv; mg->mg_flags &= ~MGf_REFCOUNTED; } int Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg) { AV *av = (AV*)mg->mg_obj; SV **svp = AvARRAY(av); I32 i = AvFILLp(av); while (i >= 0) { if (svp[i] && svp[i] != &PL_sv_undef) { if (!SvWEAKREF(svp[i])) Perl_croak(aTHX_ "panic: magic_killbackrefs"); /* XXX Should we check that it hasn't changed? */ SvRV(svp[i]) = 0; (void)SvOK_off(svp[i]); SvWEAKREF_off(svp[i]); svp[i] = &PL_sv_undef; } i--; } SvREFCNT_dec(av); /* remove extra count added by sv_add_backref() */ return 0; } int Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg) { mg->mg_len = -1; SvSCREAM_off(sv); return 0; } int Perl_magic_setbm(pTHX_ SV *sv, MAGIC *mg) { sv_unmagic(sv, PERL_MAGIC_bm); SvVALID_off(sv); return 0; } int Perl_magic_setfm(pTHX_ SV *sv, MAGIC *mg) { sv_unmagic(sv, PERL_MAGIC_fm); SvCOMPILED_off(sv); return 0; } int Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg) { struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr; if (uf && uf->uf_set) (*uf->uf_set)(aTHX_ uf->uf_index, sv); return 0; } int Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg) { sv_unmagic(sv, PERL_MAGIC_qr); return 0; } int Perl_magic_freeregexp(pTHX_ SV *sv, MAGIC *mg) { regexp *re = (regexp *)mg->mg_obj; ReREFCNT_dec(re); return 0; } #ifdef USE_LOCALE_COLLATE int Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg) { /* * RenE Descartes said "I think not." * and vanished with a faint plop. */ if (mg->mg_ptr) { Safefree(mg->mg_ptr); mg->mg_ptr = NULL; mg->mg_len = -1; } return 0; } #endif /* USE_LOCALE_COLLATE */ /* Just clear the UTF-8 cache data. */ int Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg) { Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */ mg->mg_ptr = 0; mg->mg_len = -1; /* The mg_len holds the len cache. */ return 0; } int Perl_magic_set(pTHX_ SV *sv, MAGIC *mg) { register char *s; I32 i; STRLEN len; switch (*mg->mg_ptr) { case '\001': /* ^A */ sv_setsv(PL_bodytarget, sv); break; case '\003': /* ^C */ PL_minus_c = (bool)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)); break; case '\004': /* ^D */ #ifdef DEBUGGING s = SvPV_nolen(sv); PL_debug = get_debug_opts(&s) | DEBUG_TOP_FLAG; DEBUG_x(dump_all()); #else PL_debug = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) | DEBUG_TOP_FLAG; #endif break; case '\005': /* ^E */ if (*(mg->mg_ptr+1) == '\0') { #ifdef MACOS_TRADITIONAL gMacPerl_OSErr = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); #else # ifdef VMS set_vaxc_errno(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)); # else # ifdef WIN32 SetLastError( SvIV(sv) ); # else # ifdef OS2 os2_setsyserrno(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)); # else /* will anyone ever use this? */ SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv), 4); # endif # endif # endif #endif } else if (strEQ(mg->mg_ptr+1, "NCODING")) { if (PL_encoding) SvREFCNT_dec(PL_encoding); if (SvOK(sv) || SvGMAGICAL(sv)) { PL_encoding = newSVsv(sv); } else { PL_encoding = Nullsv; } } break; case '\006': /* ^F */ PL_maxsysfd = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); break; case '\010': /* ^H */ PL_hints = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); break; case '\011': /* ^I */ /* NOT \t in EBCDIC */ if (PL_inplace) Safefree(PL_inplace); if (SvOK(sv)) PL_inplace = savepv(SvPV(sv,len)); else PL_inplace = Nullch; break; case '\017': /* ^O */ if (*(mg->mg_ptr+1) == '\0') { if (PL_osname) Safefree(PL_osname); if (SvOK(sv)) PL_osname = savepv(SvPV(sv,len)); else PL_osname = Nullch; } else if (strEQ(mg->mg_ptr, "\017PEN")) { if (!PL_compiling.cop_io) PL_compiling.cop_io = newSVsv(sv); else sv_setsv(PL_compiling.cop_io,sv); } break; case '\020': /* ^P */ PL_perldb = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); if (PL_perldb && !PL_DBsingle) init_debugger(); break; case '\024': /* ^T */ #ifdef BIG_TIME PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv)); #else PL_basetime = (Time_t)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)); #endif break; case '\027': /* ^W & $^WARNING_BITS */ if (*(mg->mg_ptr+1) == '\0') { if ( ! (PL_dowarn & G_WARN_ALL_MASK)) { i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); PL_dowarn = (PL_dowarn & ~G_WARN_ON) | (i ? G_WARN_ON : G_WARN_OFF) ; } } else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) { if ( ! (PL_dowarn & G_WARN_ALL_MASK)) { if (!SvPOK(sv) && PL_localizing) { sv_setpvn(sv, WARN_NONEstring, WARNsize); PL_compiling.cop_warnings = pWARN_NONE; break; } { STRLEN len, i; int accumulate = 0 ; int any_fatals = 0 ; char * ptr = (char*)SvPV(sv, len) ; for (i = 0 ; i < len ; ++i) { accumulate |= ptr[i] ; any_fatals |= (ptr[i] & 0xAA) ; } if (!accumulate) PL_compiling.cop_warnings = pWARN_NONE; else if (isWARN_on(sv, WARN_ALL) && !any_fatals) { PL_compiling.cop_warnings = pWARN_ALL; PL_dowarn |= G_WARN_ONCE ; } else { if (specialWARN(PL_compiling.cop_warnings)) PL_compiling.cop_warnings = newSVsv(sv) ; else sv_setsv(PL_compiling.cop_warnings, sv); if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE)) PL_dowarn |= G_WARN_ONCE ; } } } } break; case '.': if (PL_localizing) { if (PL_localizing == 1) SAVESPTR(PL_last_in_gv); } else if (SvOK(sv) && GvIO(PL_last_in_gv)) IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv); break; case '^': Safefree(IoTOP_NAME(GvIOp(PL_defoutgv))); IoTOP_NAME(GvIOp(PL_defoutgv)) = s = savepv(SvPV(sv,len)); IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO); break; case '~': Safefree(IoFMT_NAME(GvIOp(PL_defoutgv))); IoFMT_NAME(GvIOp(PL_defoutgv)) = s = savepv(SvPV(sv,len)); IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO); break; case '=': IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)); break; case '-': IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)); if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L) IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L; break; case '%': IoPAGE(GvIOp(PL_defoutgv)) = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)); break; case '|': { IO *io = GvIOp(PL_defoutgv); if(!io) break; if ((SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) == 0) IoFLAGS(io) &= ~IOf_FLUSH; else { if (!(IoFLAGS(io) & IOf_FLUSH)) { PerlIO *ofp = IoOFP(io); if (ofp) (void)PerlIO_flush(ofp); IoFLAGS(io) |= IOf_FLUSH; } } } break; case '/': SvREFCNT_dec(PL_rs); PL_rs = newSVsv(sv); break; case '\\': if (PL_ors_sv) SvREFCNT_dec(PL_ors_sv); if (SvOK(sv) || SvGMAGICAL(sv)) { PL_ors_sv = newSVsv(sv); } else { PL_ors_sv = Nullsv; } break; case ',': if (PL_ofs_sv) SvREFCNT_dec(PL_ofs_sv); if (SvOK(sv) || SvGMAGICAL(sv)) { PL_ofs_sv = newSVsv(sv); } else { PL_ofs_sv = Nullsv; } break; case '#': if (PL_ofmt) Safefree(PL_ofmt); PL_ofmt = savepv(SvPV(sv,len)); break; case '[': PL_compiling.cop_arybase = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); break; case '?': #ifdef COMPLEX_STATUS if (PL_localizing == 2) { PL_statusvalue = LvTARGOFF(sv); PL_statusvalue_vms = LvTARGLEN(sv); } else #endif #ifdef VMSISH_STATUS if (VMSISH_STATUS) STATUS_NATIVE_SET((U32)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv))); else #endif STATUS_POSIX_SET(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)); break; case '!': { #ifdef VMS # define PERL_VMS_BANG vaxc$errno #else # define PERL_VMS_BANG 0 #endif SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0, (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG); } break; case '<': PL_uid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); if (PL_delaymagic) { PL_delaymagic |= DM_RUID; break; /* don't do magic till later */ } #ifdef HAS_SETRUID (void)setruid((Uid_t)PL_uid); #else #ifdef HAS_SETREUID (void)setreuid((Uid_t)PL_uid, (Uid_t)-1); #else #ifdef HAS_SETRESUID (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1); #else if (PL_uid == PL_euid) /* special case $< = $> */ (void)PerlProc_setuid(PL_uid); else { PL_uid = PerlProc_getuid(); Perl_croak(aTHX_ "setruid() not implemented"); } #endif #endif #endif PL_uid = PerlProc_getuid(); PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid)); break; case '>': PL_euid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); if (PL_delaymagic) { PL_delaymagic |= DM_EUID; break; /* don't do magic till later */ } #ifdef HAS_SETEUID (void)seteuid((Uid_t)PL_euid); #else #ifdef HAS_SETREUID (void)setreuid((Uid_t)-1, (Uid_t)PL_euid); #else #ifdef HAS_SETRESUID (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1); #else if (PL_euid == PL_uid) /* special case $> = $< */ PerlProc_setuid(PL_euid); else { PL_euid = PerlProc_geteuid(); Perl_croak(aTHX_ "seteuid() not implemented"); } #endif #endif #endif PL_euid = PerlProc_geteuid(); PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid)); break; case '(': PL_gid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); if (PL_delaymagic) { PL_delaymagic |= DM_RGID; break; /* don't do magic till later */ } #ifdef HAS_SETRGID (void)setrgid((Gid_t)PL_gid); #else #ifdef HAS_SETREGID (void)setregid((Gid_t)PL_gid, (Gid_t)-1); #else #ifdef HAS_SETRESGID (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1); #else if (PL_gid == PL_egid) /* special case $( = $) */ (void)PerlProc_setgid(PL_gid); else { PL_gid = PerlProc_getgid(); Perl_croak(aTHX_ "setrgid() not implemented"); } #endif #endif #endif PL_gid = PerlProc_getgid(); PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid)); break; case ')': #ifdef HAS_SETGROUPS { char *p = SvPV(sv, len); Groups_t gary[NGROUPS]; while (isSPACE(*p)) ++p; PL_egid = Atol(p); for (i = 0; i < NGROUPS; ++i) { while (*p && !isSPACE(*p)) ++p; while (isSPACE(*p)) ++p; if (!*p) break; gary[i] = Atol(p); } if (i) (void)setgroups(i, gary); } #else /* HAS_SETGROUPS */ PL_egid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv); #endif /* HAS_SETGROUPS */ if (PL_delaymagic) { PL_delaymagic |= DM_EGID; break; /* don't do magic till later */ } #ifdef HAS_SETEGID (void)setegid((Gid_t)PL_egid); #else #ifdef HAS_SETREGID (void)setregid((Gid_t)-1, (Gid_t)PL_egid); #else #ifdef HAS_SETRESGID (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1); #else if (PL_egid == PL_gid) /* special case $) = $( */ (void)PerlProc_setgid(PL_egid); else { PL_egid = PerlProc_getegid(); Perl_croak(aTHX_ "setegid() not implemented"); } #endif #endif #endif PL_egid = PerlProc_getegid(); PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid)); break; case ':': PL_chopset = SvPV_force(sv,len); break; #ifndef MACOS_TRADITIONAL case '0': LOCK_DOLLARZERO_MUTEX; #ifdef HAS_SETPROCTITLE /* The BSDs don't show the argv[] in ps(1) output, they * show a string from the process struct and provide * the setproctitle() routine to manipulate that. */ { s = SvPV(sv, len); # if __FreeBSD_version > 410001 /* The leading "-" removes the "perl: " prefix, * but not the "(perl) suffix from the ps(1) * output, because that's what ps(1) shows if the * argv[] is modified. */ setproctitle("-%s", s); # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */ /* This doesn't really work if you assume that * $0 = 'foobar'; will wipe out 'perl' from the $0 * because in ps(1) output the result will be like * sprintf("perl: %s (perl)", s) * I guess this is a security feature: * one (a user process) cannot get rid of the original name. * --jhi */ setproctitle("%s", s); # endif } #endif #if defined(__hpux) && defined(PSTAT_SETCMD) { union pstun un; s = SvPV(sv, len); un.pst_command = s; pstat(PSTAT_SETCMD, un, len, 0, 0); } #endif /* PL_origalen is set in perl_parse(). */ s = SvPV_force(sv,len); if (len >= (STRLEN)PL_origalen) { /* Longer than original, will be truncated. */ Copy(s, PL_origargv[0], PL_origalen, char); PL_origargv[0][PL_origalen - 1] = 0; } else { /* Shorter than original, will be padded. */ Copy(s, PL_origargv[0], len, char); PL_origargv[0][len] = 0; memset(PL_origargv[0] + len + 1, /* Is the space counterintuitive? Yes. * (You were expecting \0?) * Does it work? Seems to. (In Linux 2.4.20 at least.) * --jhi */ (int)' ', PL_origalen - len - 1); for (i = 1; i < PL_origargc; i++) PL_origargv[i] = 0; } UNLOCK_DOLLARZERO_MUTEX; break; #endif } return 0; } I32 Perl_whichsig(pTHX_ char *sig) { register char **sigv; for (sigv = PL_sig_name; *sigv; sigv++) if (strEQ(sig,*sigv)) return PL_sig_num[sigv - PL_sig_name]; #ifdef SIGCLD if (strEQ(sig,"CHLD")) return SIGCLD; #endif #ifdef SIGCHLD if (strEQ(sig,"CLD")) return SIGCHLD; #endif return -1; } #if !defined(PERL_IMPLICIT_CONTEXT) static SV* sig_sv; #endif Signal_t Perl_sighandler(int sig) { #ifdef PERL_GET_SIG_CONTEXT dTHXa(PERL_GET_SIG_CONTEXT); #else dTHX; #endif dSP; GV *gv = Nullgv; HV *st; SV *sv = Nullsv, *tSv = PL_Sv; CV *cv = Nullcv; OP *myop = PL_op; U32 flags = 0; XPV *tXpv = PL_Xpv; if (PL_savestack_ix + 15 <= PL_savestack_max) flags |= 1; if (PL_markstack_ptr < PL_markstack_max - 2) flags |= 4; if (PL_retstack_ix < PL_retstack_max - 2) flags |= 8; if (PL_scopestack_ix < PL_scopestack_max - 3) flags |= 16; if (!PL_psig_ptr[sig]) { PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n", PL_sig_name[sig]); exit(sig); } /* Max number of items pushed there is 3*n or 4. We cannot fix infinity, so we fix 4 (in fact 5): */ if (flags & 1) { PL_savestack_ix += 5; /* Protect save in progress. */ SAVEDESTRUCTOR_X(unwind_handler_stack, (void*)&flags); } if (flags & 4) PL_markstack_ptr++; /* Protect mark. */ if (flags & 8) { PL_retstack_ix++; PL_retstack[PL_retstack_ix] = NULL; } if (flags & 16) PL_scopestack_ix += 1; /* sv_2cv is too complicated, try a simpler variant first: */ if (!SvROK(PL_psig_ptr[sig]) || !(cv = (CV*)SvRV(PL_psig_ptr[sig])) || SvTYPE(cv) != SVt_PVCV) cv = sv_2cv(PL_psig_ptr[sig],&st,&gv,TRUE); if (!cv || !CvROOT(cv)) { if (ckWARN(WARN_SIGNAL)) Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n", PL_sig_name[sig], (gv ? GvENAME(gv) : ((cv && CvGV(cv)) ? GvENAME(CvGV(cv)) : "__ANON__"))); goto cleanup; } if(PL_psig_name[sig]) { sv = SvREFCNT_inc(PL_psig_name[sig]); flags |= 64; #if !defined(PERL_IMPLICIT_CONTEXT) sig_sv = sv; #endif } else { sv = sv_newmortal(); sv_setpv(sv,PL_sig_name[sig]); } PUSHSTACKi(PERLSI_SIGNAL); PUSHMARK(SP); PUSHs(sv); PUTBACK; call_sv((SV*)cv, G_DISCARD|G_EVAL); POPSTACK; if (SvTRUE(ERRSV)) { #ifndef PERL_MICRO #ifdef HAS_SIGPROCMASK /* Handler "died", for example to get out of a restart-able read(). * Before we re-do that on its behalf re-enable the signal which was * blocked by the system when we entered. */ sigset_t set; sigemptyset(&set); sigaddset(&set,sig); sigprocmask(SIG_UNBLOCK, &set, NULL); #else /* Not clear if this will work */ (void)rsignal(sig, SIG_IGN); (void)rsignal(sig, &Perl_csighandler); #endif #endif /* !PERL_MICRO */ Perl_die(aTHX_ Nullformat); } cleanup: if (flags & 1) PL_savestack_ix -= 8; /* Unprotect save in progress. */ if (flags & 4) PL_markstack_ptr--; if (flags & 8) PL_retstack_ix--; if (flags & 16) PL_scopestack_ix -= 1; if (flags & 64) SvREFCNT_dec(sv); PL_op = myop; /* Apparently not needed... */ PL_Sv = tSv; /* Restore global temporaries. */ PL_Xpv = tXpv; return; } static void restore_magic(pTHX_ void *p) { MGS* mgs = SSPTR(PTR2IV(p), MGS*); SV* sv = mgs->mgs_sv; if (!sv) return; if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) { if (mgs->mgs_flags) SvFLAGS(sv) |= mgs->mgs_flags; else mg_magical(sv); if (SvGMAGICAL(sv)) SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK); } mgs->mgs_sv = NULL; /* mark the MGS structure as restored */ /* If we're still on top of the stack, pop us off. (That condition * will be satisfied if restore_magic was called explicitly, but *not* * if it's being called via leave_scope.) * The reason for doing this is that otherwise, things like sv_2cv() * may leave alloc gunk on the savestack, and some code * (e.g. sighandler) doesn't expect that... */ if (PL_savestack_ix == mgs->mgs_ss_ix) { I32 popval = SSPOPINT; assert(popval == SAVEt_DESTRUCTOR_X); PL_savestack_ix -= 2; popval = SSPOPINT; assert(popval == SAVEt_ALLOC); popval = SSPOPINT; PL_savestack_ix -= popval; } } static void unwind_handler_stack(pTHX_ void *p) { U32 flags = *(U32*)p; if (flags & 1) PL_savestack_ix -= 5; /* Unprotect save in progress. */ /* cxstack_ix-- Not needed, die already unwound it. */ #if !defined(PERL_IMPLICIT_CONTEXT) if (flags & 64) SvREFCNT_dec(sig_sv); #endif }