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-rw-r--r--ext/bigdecimal/bigdecimal.c4
-rw-r--r--ext/json/generator/generator.c1
-rw-r--r--ext/zlib/zlib.c1
3 files changed, 5 insertions, 1 deletions
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index f33dd82..31479d4 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -2494,7 +2494,9 @@ BigDecimal_initialize_copy(VALUE self, VALUE other)
Real *pv = rb_check_typeddata(self, &BigDecimal_data_type);
Real *x = rb_check_typeddata(other, &BigDecimal_data_type);
- DATA_PTR(self) = VpCopy(pv, x);
+ if (self != other) {
+ DATA_PTR(self) = VpCopy(pv, x);
+ }
return self;
}
diff --git a/ext/json/generator/generator.c b/ext/json/generator/generator.c
index 06509ca..1b9652d 100644
--- a/ext/json/generator/generator.c
+++ b/ext/json/generator/generator.c
@@ -965,6 +965,7 @@ static VALUE cState_init_copy(VALUE obj, VALUE orig)
{
JSON_Generator_State *objState, *origState;
+ if (obj == orig) return obj;
Data_Get_Struct(obj, JSON_Generator_State, objState);
Data_Get_Struct(orig, JSON_Generator_State, origState);
if (!objState) rb_raise(rb_eArgError, "unallocated JSON::State");
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index c0f52c2..824dd13 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -1563,6 +1563,7 @@ rb_deflate_init_copy(VALUE self, VALUE orig)
Data_Get_Struct(self, struct zstream, z1);
z2 = get_zstream(orig);
+ if (z1 == z2) return self;
err = deflateCopy(&z1->stream, &z2->stream);
if (err != Z_OK) {
raise_zlib_error(err, 0);