XuNeo commented on code in PR #15623:
URL: https://github.com/apache/nuttx/pull/15623#discussion_r1923125832


##########
libs/libc/gdbstub/lib_gdbstub.c:
##########
@@ -283,9 +287,43 @@ static int gdb_putchar(FAR struct gdb_state_s *state, int 
ch)
       return ret;
     }
 
+  if (csum)
+    {
+      *csum += tmp;
+    }
+
   return tmp;
 }
 
+/****************************************************************************
+ * Name: gdb_escapechar
+ *
+ * Description:
+ *   Send out a char, do escaping if necessary.
+ *   Do note that for RLE encoded data, the length byte should NOT escape.
+ *   See gdb src of remote.c remote_target::read_frame
+ *
+ * Input Parameters:
+ *   state   - The pointer to the GDB state structure.
+ *   ch      - The character to be sent.
+ *   csum    - The checksum.
+ *
+ ****************************************************************************/
+
+static void gdb_escapechar(FAR struct gdb_state_s *state, char c,
+                           FAR char *csum)
+{
+  if (c == '#' || c == '$' || c == '}' || c == '*')
+    {
+      gdb_putchar(state, '}', csum);
+      gdb_putchar(state, c ^ 0x20, csum); /* See 
https://sourceware.org/gdb/current/onlinedocs/gdb.html/Overview.html#Binary-Data
 */

Review Comment:
   Too long to fit in one line. In line comment will work around the style 
warning. Similar to comments in `struct tcbinfo_s` for the long web link.



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