Parse a little TELNET control string.

Support big screen on telnet connection.


git-svn-id: http://opensvn.csie.org/pttbbs/trunk/pttbbs@2098 63ad8ddf-47c3-0310-b6dd-a9e9d9715204

1 files changed, 41 insertions, 19 deletions

diff --git a/mbbsd/term.c b/mbbsd/term.c
index 555840d1..f58bbfb8 100644
--- a/mbbsd/term.c
+++ b/mbbsd/term.c
@@ -53,21 +53,10 @@ outcf(int ch)
 #endif
 
 static void
-term_resize(int sig)
-{
-    struct winsize  newsize;
+term_resize(int row, int col){
     screenline_t   *new_picture;
-
-    signal(SIGWINCH, SIG_IGN);	/* Don't bother me! */
-    ioctl(0, TIOCGWINSZ, &newsize);
-
-    /* make sure reasonable size */
-    newsize.ws_row = MAX(24, MIN(100, newsize.ws_row));
-    newsize.ws_col = MAX(80, MIN(200, newsize.ws_col));
-
-    if (newsize.ws_row > t_lines) {
-	new_picture = (screenline_t *) calloc(newsize.ws_row,
-					      sizeof(screenline_t));
+    if (big_picture != NULL && row > t_lines) {
+	new_picture = (screenline_t *) calloc(row, sizeof(screenline_t));
 	if (new_picture == NULL) {
 	    syslog(LOG_ERR, "calloc(): %m");
 	    return;
@@ -76,19 +65,52 @@ term_resize(int sig)
 	free(big_picture);
 	big_picture = new_picture;
     }
-    t_lines = newsize.ws_row;
-    t_columns = newsize.ws_col;
-    scr_lns = t_lines;	/* XXX: scr_lns 跟 t_lines 有什麼不同, 為何分成兩個 */
+    t_lines = row;
+    t_columns = col;
     b_lines = t_lines - 1;
     p_lines = t_lines - 4;
+}
 
-    signal(SIGWINCH, term_resize);
+static void
+term_resize_catch(int sig)
+{
+    struct winsize  newsize;
+
+    signal(SIGWINCH, SIG_IGN);	/* Don't bother me! */
+    ioctl(0, TIOCGWINSZ, &newsize);
+
+    /* make sure reasonable size */
+    newsize.ws_row = MAX(24, MIN(100, newsize.ws_row));
+    newsize.ws_col = MAX(80, MIN(200, newsize.ws_col));
+
+    term_resize(newsize.ws_row, newsize.ws_col);
+
+    signal(SIGWINCH, term_resize_catch);
+}
+
+#ifndef SKIP_TELNET_CONTROL_SIGNAL
+void
+telnet_parse_size(const unsigned char* msg){
+    /* msg[0] == IAC, msg[1] == SB, msg[2] = TELOPT_NAWS */
+    int i = 4, row, col;
+
+    col = msg[3] << 8;
+    if(msg[i] == 0xff)
+	++i; /* avoid escaped 0xff */
+    col |= msg[i++];
+
+    row = msg[i++] << 8;
+    if(msg[i] == 0xff)
+	++i;
+    row |= msg[i];
+    term_resize(row, col);
 }
+#endif
 
 int
 term_init()
 {
-    signal(SIGWINCH, term_resize);
+    signal(SIGWINCH, term_resize_catch);
     return YEA;
 }