The magic variables that alter STDOUT have a tendancy to segfault

when accessed if STDOUT is undefined. Protect them.

p4raw-id: //depot/perl@20809

diff --git a/mg.c b/mg.c
index 8a40a76..d298176 100644 (file)
--- a/mg.c
+++ b/mg.c
@@ -805,7 +805,8 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
        }
        break;
     case '^':
-       s = IoTOP_NAME(GvIOp(PL_defoutgv));
+       if (GvIOp(PL_defoutgv))
+           s = IoTOP_NAME(GvIOp(PL_defoutgv));
        if (s)
            sv_setpv(sv,s);
        else {
@@ -814,20 +815,24 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
        }
        break;
     case '~':
-       s = IoFMT_NAME(GvIOp(PL_defoutgv));
+       if (GvIOp(PL_defoutgv))
+           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)));
+       if (GvIOp(PL_defoutgv))
+           sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
        break;
     case '-':
-       sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
+       if (GvIOp(PL_defoutgv))
+           sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
        break;
     case '%':
-       sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
+       if (GvIOp(PL_defoutgv))
+           sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
        break;
 #endif
     case ':':
@@ -838,7 +843,8 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
        WITH_THR(sv_setiv(sv, (IV)PL_curcop->cop_arybase));
        break;
     case '|':
-       sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
+       if (GvIOp(PL_defoutgv))
+           sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
        break;
     case ',':
        break;