- Song Ma's warning if -r/--range is given with a "bad" range, also noted in

the man page now.

src/main.c

@@ -2350,7 +2350,7 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
          (and won't actually be range by definition). The man page previously
          claimed that to be a good way, why this code is added to work-around
          it. */
-      if(!strchr(nextarg, '-')) {
+      if(ISDIGIT(*nextarg) && !strchr(nextarg, '-')) {
         char buffer[32];
         curl_off_t off;
         warnf(config,
@@ -2360,10 +2360,23 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
         snprintf(buffer, sizeof(buffer), "%Od-", off);
         GetStr(&config->range, buffer);
       }
-      else
+      {
+        /* byte range requested */
+        char* tmp_range;
+        tmp_range=nextarg;
+        while(*tmp_range != '\0') {
+          if(!ISDIGIT(*tmp_range)&&*tmp_range!='-'&&*tmp_range!=',') {
+            warnf(config,"Invalid character is found in given range. "
+                  "A specified range MUST have only digits in "
+                  "\'start\'-\'stop\'. The server's response to this "
+                  "request is uncertain.\n");
+            break;
+          }
+          tmp_range++;
+        }
         /* byte range requested */
         GetStr(&config->range, nextarg);
-
+      }
       break;
     case 'R':
       /* use remote file's time */