Update run.cpp

enforce that and argument must have at least length 2, and refine check for uniarg (ie arg plus flag value in one option) to be args with more than 2 characters

Author: mikekgfb

runner/run.cpp

@@ -811,8 +811,12 @@ int main(int argc, char *argv[]) {
       error_usage();
     } // must start with dash
 
+    if strlen(argv[i]) < 2 {
+      error_usage();
+    } // must have at least dash '-' and option letter
+    
     // uniarg means the arg comes right after the letter in accordance with posix
-    int uniarg = strlen(argv[i]) != 2; 
+    int uniarg = strlen(argv[i]) > 2; 
     if (uniarg) {
       parm=&argv[i][2];
     } else if (i + 1 >= argc) {