linenoise: bugfix: caret notation in insert-at-end.

* linenoise.c (edit_insert): In the optimized insertion case
at the end of the buffer in multi-line mode, we must render
control characters in the same manner as in the slow refresh
case: namely, with the caret notatiion: ^@, ^A, ...

1 files changed, 10 insertions, 1 deletions

diff --git a/linenoise/linenoise.c b/linenoise/linenoise.c
index f409c98f..a83964e5 100644
--- a/linenoise/linenoise.c
+++ b/linenoise/linenoise.c
@@ -1569,7 +1569,16 @@ static int edit_insert(lino_t *l, wchar_t c) {
                  * make the display length different from the buffer length.
                  * multi-line-mode: we are just adding to the end.
                  */
-                wchar_t str[2] = { c };
+                wchar_t str[3] = L"^";
+
+                if (c == 0xdc00 || c < ' ') {
+                    str[1] = '@' + (c & 0xff);
+                } else if (c == 127) {
+                    str[1] = '?';
+                } else {
+                    str[0] = c;
+                }
+
                 if (!lino_os.puts_fn(l->tty_ofs, str))
                     return -1;
                 if (l->mlmode)