Add sv_force_normal() to sv_utf8_downgrade() as suggested

by Inaba Hiroto.

p4raw-id: //depot/perl@8517

1 files changed, 7 insertions, 3 deletions

diff --git a/sv.c b/sv.c
index 0d1bc6ce1c..93188dff27 100644
--- a/sv.c
+++ b/sv.c
@@ -2957,6 +2957,7 @@ Perl_sv_utf8_upgrade(pTHX_ register SV *sv)
 
     if (hibit) {
 	STRLEN len;
+
 	if (SvREADONLY(sv) && SvFAKE(sv)) {
 	    sv_force_normal(sv);
 	    s = SvPVX(sv);
@@ -2987,10 +2988,13 @@ Perl_sv_utf8_downgrade(pTHX_ register SV* sv, bool fail_ok)
 {
     if (SvPOK(sv) && SvUTF8(sv)) {
         if (SvCUR(sv)) {
-	    char *c = SvPVX(sv);
-	    STRLEN len = SvCUR(sv);
+	    char *s;
+	    STRLEN len;
 
-	    if (!utf8_to_bytes((U8*)c, &len)) {
+	    if (SvREADONLY(sv) && SvFAKE(sv))
+		sv_force_normal(sv);
+	    s = SvPV(sv, len);
+	    if (!utf8_to_bytes((U8*)s, &len)) {
 	        if (fail_ok)
 		    return FALSE;
 		else {