a bunch of misc. changes

utils.h

@@ -211,6 +211,14 @@ unsigned int gcd_n_uint(int nvals, unsigned int *val);
 int arg_parse(const char *command, char ***argv);
 void arg_parse_free(char **argv);
 
+/* Converts an Nmap time specification string into milliseconds.  If
+   the string is a plain non-negative number, it is considered to
+   already be in milliseconds and is returned.  If it is a number
+   followed by 's' (for seconds), 'm' (minutes), or 'h' (hours), the
+   number is converted to milliseconds and returned.  If Nmap cannot
+   parse the string, it is returned instead. */
+long tval2msecs(char *tspec);
+
 /* Convert a string in the format of a roughly C-style string literal
    (e.g. can have \r, \n, \xHH escapes, etc.) into a binary string.
    This is done in-place, and the new (shorter or the same) length is