Add +pc {latin1|unicode} switch and io:printable_range/0

This is the base for implementing configurable
~tp printouts, so that the user can define which
characters to view as actually printable in the shell and
by io_lib:format.

The functionality is neither documented nor used in this commit

1 files changed, 8 insertions, 0 deletions

diff --git a/erts/emulator/beam/erl_unicode.c b/erts/emulator/beam/erl_unicode.c
index 80982f3760..fa53fd0937 100644
--- a/erts/emulator/beam/erl_unicode.c
+++ b/erts/emulator/beam/erl_unicode.c
@@ -2747,3 +2747,11 @@ int erts_utf8_to_latin1(byte* dest, const byte* source, int slen)
     return dp - dest;
 }
 
+BIF_RETTYPE io_printable_range_0(BIF_ALIST_0)
+{
+    if (erts_get_printable_characters() == ERL_PRINTABLE_CHARACTERS_UNICODE) {
+	BIF_RET(am_unicode);
+    } else {
+	BIF_RET(am_latin1);
+    }
+}