Make prim_file skip invalid filenames in unicode mode

The fix affects list_dir and read_link. Raw filenames are now
never produced, just consumed even if +fnu or +fna is used on
Linux etc.

This also adds the options to get error return or error handler
warning messages with +fn{u|a}{i|w|e} as an option to erl.

This is still not documented and there needs to be other versions
of read_dir and read_link to facilitate reading of all types
of filenames and links.

A check that we will not change to an invalid directory is also needed.

1 files changed, 8 insertions, 1 deletions

diff --git a/erts/emulator/sys/common/erl_sys_common_misc.c b/erts/emulator/sys/common/erl_sys_common_misc.c
index 1bf5fa89f4..a0cd4cd10a 100644
--- a/erts/emulator/sys/common/erl_sys_common_misc.c
+++ b/erts/emulator/sys/common/erl_sys_common_misc.c
@@ -47,14 +47,16 @@
 /* Written once and only once */
 
 static int filename_encoding = ERL_FILENAME_UNKNOWN;
+static int filename_warning = ERL_FILENAME_WARNING_WARNING;
 #if defined(__WIN32__) || defined(__DARWIN__)
 static int user_filename_encoding = ERL_FILENAME_UTF8; /* Default unicode on windows */
 #else
 static int user_filename_encoding = ERL_FILENAME_LATIN1;
 #endif
-void erts_set_user_requested_filename_encoding(int encoding)
+void erts_set_user_requested_filename_encoding(int encoding, int warning)
 {
     user_filename_encoding = encoding;
+    filename_warning = warning;
 }
 
 int erts_get_user_requested_filename_encoding(void)
@@ -62,6 +64,11 @@ int erts_get_user_requested_filename_encoding(void)
     return user_filename_encoding;
 }
 
+int erts_get_filename_warning_type(void)
+{
+    return filename_warning;
+}
+
 void erts_init_sys_common_misc(void)
 {
 #if defined(__WIN32__)