Add rig_error2 for single-line debug message output

include/hamlib/rig.h

@@ -3253,6 +3253,8 @@ rig_passband_wide HAMLIB_PARAMS((RIG *rig,
 
 extern HAMLIB_EXPORT(const char *)
 rigerror HAMLIB_PARAMS((int errnum));
+extern HAMLIB_EXPORT(const char *)
+rigerror2 HAMLIB_PARAMS((int errnum));
 
 extern HAMLIB_EXPORT(int)
 rig_setting2idx HAMLIB_PARAMS((setting_t s));

src/rig.c

@@ -390,6 +390,21 @@ void add2debugmsgsave(const char *s)
  *
  * \todo support gettext/localization
  */
+const char *HAMLIB_API rigerror2(int errnum) // returns single-line message
+{
+    errnum = abs(errnum);
+
+    if (errnum >= ERROR_TBL_SZ)
+    {
+        // This should not happen, but if it happens don't return NULL
+        return "ERR_OUT_OF_RANGE";
+    }
+
+    static char msg[DEBUGMSGSAVE_SIZE];
+    snprintf(msg, sizeof(msg), "%s\n", rigerror_table[errnum]);
+    return msg;
+}
+
 const char *HAMLIB_API rigerror(int errnum)
 {
     errnum = abs(errnum);