/* ** ** Force Perl to use unbuffered I/O ** */ void Perl5_ForceUnbufferedStdout(pTHX) { dTHR; IoFLAGS(GvIOp(PL_defoutgv)) |= IOf_FLUSH; /* $|=1 */ return; }
OP * Perl_do_readline(pTHX_ GV* gv) { dVAR; dSP; dTARGETSTACKED; register SV *sv; STRLEN tmplen = 0; STRLEN offset; PerlIO *fp; register IO * const io = GvIO(gv); register const I32 type = PL_op->op_type; const I32 gimme = GIMME_V; PERL_ARGS_ASSERT_DO_READLINE; fp = NULL; if (io) { fp = IoIFP(io); if (!fp) { if (IoFLAGS(io) & IOf_ARGV) { if (IoFLAGS(io) & IOf_START) { IoLINES(io) = 0; if (av_len(GvAVn(gv)) < 0) { IoFLAGS(io) &= ~IOf_START; do_openn(io,"-",1,FALSE,O_RDONLY,0,NULL,NULL,0); sv_setpvn(GvSVn(gv), "-", 1); SvSETMAGIC(GvSV(gv)); fp = IoIFP(io); goto have_fp; } } fp = nextargv(gv); if (!fp) { /* Note: fp != IoIFP(io) */ (void)do_close(gv, FALSE); /* now it does*/ } } } else if (ckWARN(WARN_IO) && IoTYPE(io) == IoTYPE_WRONLY) { report_evil_fh(io, OP_phoney_OUTPUT_ONLY); } } if (!fp) { if ((!io || !(IoFLAGS(io) & IOf_START)) && ckWARN2(WARN_GLOB, WARN_CLOSED)) { if (type == OP_GLOB) Perl_warner(aTHX_ packWARN(WARN_GLOB), "glob failed (can't start child: %s)", Strerror(errno)); else report_evil_fh(io, PL_op->op_type); } if (gimme == G_SCALAR) { /* undef TARG, and push that undefined value */ if (type != OP_RCATLINE) { SV_CHECK_THINKFIRST_COW_DROP(TARG); if ( ! SvPVOK(TARG) ) sv_upgrade(TARG, SVt_PV); SvOK_off(TARG); } PUSHTARG; } RETURN; } have_fp: if (gimme == G_SCALAR) { sv = TARG; if (type == OP_RCATLINE) { NOOP; } else { if ( SvOK(sv) && ! SvPVOK(sv) ) sv_clear_body(sv); } if (SvROK(sv)) { if (type == OP_RCATLINE) SvPV_force_nolen(sv); else sv_unref(sv); } else if (isGV_with_GP(sv)) { SvPV_force_nolen(sv); } SvUPGRADE(sv, SVt_PV); tmplen = SvLEN(sv); /* remember if already alloced */ if (!tmplen && !SvREADONLY(sv)) Sv_Grow(sv, 80); /* try short-buffering it */ offset = 0; if (type == OP_RCATLINE && SvOK(sv)) { if (!SvPOK(sv)) { SvPV_force_nolen(sv); } offset = SvCUR(sv); } } else { sv = sv_2mortal(newSV(80)); offset = 0; } /* delay EOF state for a snarfed empty file */ #define SNARF_EOF(gimme,rs,io,sv) \ (gimme != G_SCALAR || SvCUR(sv) \ || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs)) for (;;) { PUTBACK; if (!sv_gets(sv, fp, offset) && (type == OP_GLOB || SNARF_EOF(gimme, PL_rs, io, sv) || PerlIO_error(fp))) { PerlIO_clearerr(fp); if (IoFLAGS(io) & IOf_ARGV) { fp = nextargv(gv); if (fp) continue; (void)do_close(gv, FALSE); } else if (type == OP_GLOB) { if (!do_close(gv, FALSE) && ckWARN(WARN_GLOB)) { Perl_warner(aTHX_ packWARN(WARN_GLOB), "glob failed (child exited with status %d%s)", (int)(STATUS_CURRENT >> 8), (STATUS_CURRENT & 0x80) ? ", core dumped" : ""); } } if (gimme == G_SCALAR) { if (type != OP_RCATLINE) { SV_CHECK_THINKFIRST_COW_DROP(TARG); SvOK_off(TARG); } SPAGAIN; PUSHTARG; } RETURN; }