JSON: Fix escaping of characters that have MSB=1 with signed char

The "\\u%04x" printf string did not really work in the correct way if
char is signed. Fix this by type casting this to unsigned char.

Signed-off-by: Jouni Malinen <j@w1.fi>

diff --git a/src/utils/json.c b/src/utils/json.c
index b64433959ff7ba9dcfbee5e1732a1de8a32c3a44..3e5e2147722388340bf3d6287aeeaf0fc2652359 100644 (file)
--- a/src/utils/json.c
+++ b/src/utils/json.c
@@ -51,7 +51,7 @@ void json_escape_string(char *txt, size_t maxlen, const char *data, size_t len)
                                *txt++ = data[i];
                        } else {
                                txt += os_snprintf(txt, end - txt, "\\u%04x",
-                                                  data[i]);
+                                                  (unsigned char) data[i]);
                        }
                        break;
                }