4 files changed, 25 insertions, 6 deletions
diff --git a/lib/erl_interface/src/encode/encode_atom.c b/lib/erl_interface/src/encode/encode_atom.c
index df4b0af5db..46d34c3bf0 100644
--- a/lib/erl_interface/src/encode/encode_atom.c
+++ b/lib/erl_interface/src/encode/encode_atom.c
@@ -25,7 +25,7 @@
 
 static int verify_ascii_atom(const char* src, int slen);
 static int verify_utf8_atom(const char* src, int slen);
-
+static int is_latin1_as_utf8(const char *p, int len);
 
 int ei_encode_atom(char *buf, int *index, const char *p)
 {
@@ -63,6 +63,14 @@ int ei_encode_atom_len_as(char *buf, int *index, const char *p, int len,
       return -1;
   }
 
+  if (to_enc == (ERLANG_LATIN1 | ERLANG_UTF8)) {
+    if (from_enc == ERLANG_UTF8) {
+      to_enc = is_latin1_as_utf8(p, len) ? ERLANG_LATIN1 : ERLANG_UTF8;
+    }
+    else {
+      to_enc = from_enc;
+    }
+  }
   switch(to_enc) {
   case ERLANG_LATIN1:
       if (buf) {
@@ -148,7 +156,7 @@ ei_internal_put_atom(char** bufp, const char* p, int slen,
 }
 
 
-int verify_ascii_atom(const char* src, int slen)
+static int verify_ascii_atom(const char* src, int slen)
 {
     while (slen > 0) {
 	if ((src[0] & 0x80) != 0) return -1;
@@ -158,7 +166,7 @@ int verify_ascii_atom(const char* src, int slen)
     return 0;
 }
 
-int verify_utf8_atom(const char* src, int slen)
+static int verify_utf8_atom(const char* src, int slen)
 {
     int num_chars = 0;
 
@@ -188,3 +196,13 @@ int verify_utf8_atom(const char* src, int slen)
     return 0;
 }
 
+/* Only latin1 code points in utf8 string?
+ */
+static int is_latin1_as_utf8(const char *p, int len)
+{
+  int i;
+  for (i=0; i<len; i++) {
+    if ((unsigned char)p[i] > 0xC3) return 0;
+  }
+  return 1;
+}
diff --git a/lib/erl_interface/src/encode/encode_pid.c b/lib/erl_interface/src/encode/encode_pid.c
index 903c9cce00..86d0f393e5 100644
--- a/lib/erl_interface/src/encode/encode_pid.c
+++ b/lib/erl_interface/src/encode/encode_pid.c
@@ -26,7 +26,8 @@ int ei_encode_pid(char *buf, int *index, const erlang_pid *p)
   char *s = buf + *index;
 
   ++(*index); /* skip ERL_PID_EXT */
-  if (ei_encode_atom_len_as(buf, index, p->node, strlen(p->node), ERLANG_UTF8, p->node_org_enc) < 0)
+  if (ei_encode_atom_len_as(buf, index, p->node, strlen(p->node),
+			    ERLANG_UTF8, ERLANG_LATIN1|ERLANG_UTF8) < 0)
       return -1;
 
   if (buf) {
diff --git a/lib/erl_interface/src/encode/encode_port.c b/lib/erl_interface/src/encode/encode_port.c
index c729aeb4eb..a206de56c7 100644
--- a/lib/erl_interface/src/encode/encode_port.c
+++ b/lib/erl_interface/src/encode/encode_port.c
@@ -27,7 +27,7 @@ int ei_encode_port(char *buf, int *index, const erlang_port *p)
 
   ++(*index); /* skip ERL_PORT_EXT */
   if (ei_encode_atom_len_as(buf, index, p->node, strlen(p->node), ERLANG_UTF8,
-			    p->node_org_enc) < 0) {
+			    ERLANG_LATIN1|ERLANG_UTF8) < 0) {
       return -1;
   }
   if (buf) {
diff --git a/lib/erl_interface/src/encode/encode_ref.c b/lib/erl_interface/src/encode/encode_ref.c
index 3511366bef..9855231848 100644
--- a/lib/erl_interface/src/encode/encode_ref.c
+++ b/lib/erl_interface/src/encode/encode_ref.c
@@ -28,7 +28,7 @@ int ei_encode_ref(char *buf, int *index, const erlang_ref *p)
 
   (*index) += 1 + 2; /* skip to node atom */
   if (ei_encode_atom_len_as(buf, index, p->node, strlen(p->node), ERLANG_UTF8,
-			    p->node_org_enc) < 0) {
+			    ERLANG_LATIN1|ERLANG_UTF8) < 0) {
       return -1;
   }