Currently, if the cursor position is not at the end of the command buffer
and the user uses the Tab-complete functions, then the console does not
leave the cursor in the correct position.
For example consider the following buffer with the cursor positioned
at the ^:
md kdb_pro 10
^
Pressing tab should result in:
md kdb_prompt_str 10
^
However this does not happen. Instead the cursor is placed at the end
(after then 10) and further cursor movement redraws incorrectly. The
same problem exists when we double-Tab but in a different part of the
code.
Fix this by sending a carriage return and then redisplaying the text to
the left of the cursor.
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
---
kernel/debug/kdb/kdb_io.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index a42607e4d1aba..69549fe42e87b 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -364,6 +364,8 @@ static char *kdb_read(char *buffer, size_t bufsize)
kdb_printf("\n");
kdb_printf(kdb_prompt_str);
kdb_printf("%s", buffer);
+ if (cp != lastchar)
+ kdb_position_cursor(kdb_prompt_str, buffer, cp);
} else if (tab != 2 && count > 0) {
/* How many new characters do we want from tmpbuffer? */
len_tmp = strlen(p_tmp) - len;
@@ -377,6 +379,9 @@ static char *kdb_read(char *buffer, size_t bufsize)
kdb_printf("%s", cp);
cp += len_tmp;
lastchar += len_tmp;
+ if (cp != lastchar)
+ kdb_position_cursor(kdb_prompt_str,
+ buffer, cp);
}
}
kdb_nextline = 1; /* reset output line number */
--
2.43.0