Check for NULL prompt in readline_into_buffer()

Previously, passing readline() or readline_into_buffer() a NULL 'prompt'
parameter would result in puts() printing garbage when
CONFIG_CMDLINE_EDITING was enabled.

Note that no board currently triggers this bug.  Enabling
CONFIG_CMDLINE_EDITING on some boards (eg bab7xx) would result in
the bug appearing.  This change is only intended to prevent someone
from running into this issue in the future.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

diff --git a/common/main.c b/common/main.c
index 026edd1..298982a 100644 (file)
--- a/common/main.c
+++ b/common/main.c
@@ -964,7 +964,8 @@ int readline_into_buffer (const char *const prompt, char * buffer)
                        initted = 1;
                }
 
-               puts (prompt);
+               if (prompt)
+                       puts (prompt);
 
                rc = cread_line(prompt, p, &len);
                return rc < 0 ? rc : len;