linenoise: bugfix: caret notation for NUL.

* linenoise/linenoise.c (sync_data_to_buf): The null character
appears from the stream as 0xDC00. We must test for that and
render it as ^@, counting a a width of two, rather than
sending it to the terminal, counting as width of 1.

1 files changed, 2 insertions, 2 deletions

diff --git a/linenoise/linenoise.c b/linenoise/linenoise.c
index 49b1faec..f409c98f 100644
--- a/linenoise/linenoise.c
+++ b/linenoise/linenoise.c
@@ -976,9 +976,9 @@ static void sync_data_to_buf(lino_t *l)
                 *bptr++ = '\r';
                 *bptr++ = '\n';
                 col = 0;
-            } else if (ch < ' ') {
+            } else if (ch < ' ' || ch == 0xDC00) {
                 *bptr++ = '^';
-                *bptr++ = '@' + ch;
+                *bptr++ = '@' + (ch & 0xff);
                 col += 2;
             } else if (ch == 127) {
                 *bptr++ = '^';