- Introduced a SYST-based test to properly set-up name format when dealing with the OS/400 FTP server.

- Fixed an ftp_readresp() bug preventing detection of failing control socket  and causing FTP client to loop forever.

lib/urldata.h

@@ -362,6 +362,8 @@ typedef enum {
   FTP_PROT,
   FTP_CCC,
   FTP_PWD,
+  FTP_SYST,
+  FTP_NAMEFMT,
   FTP_QUOTE, /* waiting for a response to a command sent in a quote list */
   FTP_RETR_PREQUOTE,
   FTP_STOR_PREQUOTE,
@@ -458,6 +460,7 @@ struct ftp_conn {
   struct timeval response; /* set to Curl_tvnow() when a command has been sent
                               off, used to time-out response reading */
   ftpstate state; /* always use ftp.c:state() to change state! */
+  char * server_os;     /* The target server operating system. */
 };
 
 /****************************************************************************