Be more clever :)

src/pam_linotp.c

@@ -175,6 +175,17 @@ static void do_log(int type, char * format, ...) {
     }
 }
 
+char *my_itoa(int num, char *str)
+{
+        if(str == NULL)
+        {
+                return NULL;
+        }
+        sprintf(str, "%d", num);
+        return str;
+}
+
+
 #ifdef DEBUG
 #define log_error(format, ...)   do_log(LOG_ERR,    "linotp:ERROR: "   #format, ## __VA_ARGS__)
 #define log_debug(format, ...)   do_log(LOG_ERR,    "linotp:DEBUG: "   #format, ## __VA_ARGS__)
@@ -810,8 +821,8 @@ int pam_linotp_get_config(int argc, const char *argv[], LinOTPConfig * config, i
         /* check for timeout */
         else if (check_prefix(argv[i], "timeout=", &temp) > 0) {
           /* validation */
-          if ( strlen(temp) != strlen( sprintf("%d", atoi(temp)) ) ) {
-            log_error("Timeout should be a number");
+          if ( ! atoi(temp)  ) {
+            log_error("Timeout should be a number larger than 0");
             return (PAM_AUTH_ERR);
           } else {
             config->timeout = temp;