Implement Marcin Bulandra's suggestion of only automatically updating the

[u/mdw/putty] / rlogin.c

diff --git a/rlogin.c b/rlogin.c
index a6dad0e..e40f159 100644 (file)
--- a/rlogin.c
+++ b/rlogin.c
@@ -1,3 +1,7 @@
+/*
+ * Rlogin backend.
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
@@ -20,6 +24,7 @@ typedef struct rlogin_tag {
     Socket s;
     int bufsize;
     int firstbyte;
+    int cansize;
     int term_width, term_height;
     void *frontend;
 } *Rlogin;
@@ -73,8 +78,10 @@ static int rlogin_receive(Plug plug, int urgent, char *data, int len)
 
        c = *data++;
        len--;
-       if (c == '\x80')
+       if (c == '\x80') {
+           rlogin->cansize = 1;
            rlogin_size(rlogin, rlogin->term_width, rlogin->term_height);
+        }
        /*
         * We should flush everything (aka Telnet SYNCH) if we see
         * 0x02, and we should turn off and on _local_ flow control
@@ -136,6 +143,7 @@ static const char *rlogin_init(void *frontend_handle, void **backend_handle,
     rlogin->term_width = cfg->width;
     rlogin->term_height = cfg->height;
     rlogin->firstbyte = 1;
+    rlogin->cansize = 0;
     *backend_handle = rlogin;
 
     /*
@@ -243,7 +251,7 @@ static void rlogin_size(void *handle, int width, int height)
     rlogin->term_width = width;
     rlogin->term_height = height;
 
-    if (rlogin->s == NULL)
+    if (rlogin->s == NULL || !rlogin->cansize)
        return;
 
     b[6] = rlogin->term_width >> 8;
@@ -272,10 +280,10 @@ static const struct telnet_special *rlogin_get_specials(void *handle)
     return NULL;
 }
 
-static Socket rlogin_socket(void *handle)
+static int rlogin_connected(void *handle)
 {
     Rlogin rlogin = (Rlogin) handle;
-    return rlogin->s;
+    return rlogin->s != NULL;
 }
 
 static int rlogin_sendok(void *handle)
@@ -333,7 +341,7 @@ Backend rlogin_backend = {
     rlogin_size,
     rlogin_special,
     rlogin_get_specials,
-    rlogin_socket,
+    rlogin_connected,
     rlogin_exitcode,
     rlogin_sendok,
     rlogin_ldisc,
@@ -341,5 +349,7 @@ Backend rlogin_backend = {
     rlogin_provide_logctx,
     rlogin_unthrottle,
     rlogin_cfg_info,
-    1
+    "rlogin",
+    PROT_RLOGIN,
+    513
 };