- const char *msg
- = re_error_msg[errcode] == NULL ? "Success" : re_error_msg[errcode];
- size_t msg_size = strlen (msg) + 1; /* Includes the null. */
+ const char *msg;
+ size_t msg_size;
+
+ if (errcode < 0
+ || errcode >= (sizeof (re_error_msg) / sizeof (re_error_msg[0])))
+ /* Only error codes returned by the rest of the code should be passed
+ to this routine. If we are given anything else, or if other regex
+ code generates an invalid error code, then the program has a bug.
+ Dump core so we can fix it. */
+ abort ();
+
+ msg_size = strlen (msg) + 1; /* Includes the null. */