+ {
+ /* Paranoia. Peer may send 1 gigabyte long cmd... */
+ /* Using separate len_on_stk instead of len optimizes
+ * code size (allows len to be in CPU register) */
+ size_t len_on_stk = 8 * 1024;
+ G.ftp_cmd = cmd = xmalloc_fgets_str_len(stdin, "\r\n", &len_on_stk);
+ if (!cmd)
+ exit(0);
+ len = len_on_stk;
+ }
+
+ /* De-escape telnet: 0xff,0xff => 0xff */
+ /* RFC959 says that ABOR, STAT, QUIT may be sent even during
+ * data transfer, and may be preceded by telnet's "Interrupt Process"
+ * code (two-byte sequence 255,244) and then by telnet "Synch" code
+ * 255,242 (byte 242 is sent with TCP URG bit using send(MSG_OOB)
+ * and may generate SIGURG on our side. See RFC854).
+ * So far we don't support that (may install SIGURG handler if we'd want to),
+ * but we need to at least remove 255,xxx pairs. lftp sends those. */
+ /* Then de-escape FTP: NUL => '\n' */
+ /* Testing for \xff:
+ * Create file named '\xff': echo Hello >`echo -ne "\xff"`
+ * Try to get it: ftpget -v 127.0.0.1 Eff `echo -ne "\xff\xff"`
+ * (need "\xff\xff" until ftpget applet is fixed to do escaping :)
+ * Testing for embedded LF:
+ * LF_HERE=`echo -ne "LF\nHERE"`
+ * echo Hello >"$LF_HERE"
+ * ftpget -v 127.0.0.1 LF_HERE "$LF_HERE"
+ */
+ {
+ int dst, src;
+
+ /* Strip "\r\n" if it is there */
+ if (len != 0 && cmd[len - 1] == '\n') {
+ len--;
+ if (len != 0 && cmd[len - 1] == '\r')
+ len--;
+ cmd[len] = '\0';
+ }
+ src = strchrnul(cmd, 0xff) - cmd;
+ /* 99,99% there are neither NULs nor 255s and src == len */
+ if (src < len) {
+ dst = src;
+ do {
+ if ((unsigned char)(cmd[src]) == 255) {
+ src++;
+ /* 255,xxx - skip 255 */
+ if ((unsigned char)(cmd[src]) != 255) {
+ /* 255,!255 - skip both */
+ src++;
+ continue;
+ }
+ /* 255,255 - retain one 255 */
+ }
+ /* NUL => '\n' */
+ cmd[dst++] = cmd[src] ? cmd[src] : '\n';
+ src++;
+ } while (src < len);
+ cmd[dst] = '\0';
+ }