Add session management: F7/F8/F9 keys and Ctrl+A N/1-4

Adds session_new(), session_switch(), session_next(), session_prev()
functions and wires them to F7 (new), F8 (prev), F9 (next) function keys
and Ctrl+A N / Ctrl+A 1-4 menu entries. Forward declarations added so
session helpers can be called from draw_status() before their definitions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

termtcp.c

@@ -235,6 +235,13 @@ void append_out(const char *text, int len, int attr);
 void draw_input(void);
 void send_trace_options(void);
 void tcp_disconnect(void);
+static int  session_count(void);
+static int  session_index(void);
+static void session_switch(int n);
+static void session_next(void);
+static void session_prev(void);
+static void session_new(void);
+static void do_connect(int idx);
 
 /* ═══════════════════════════════════════════════════════════
  * Config
@@ -828,14 +835,18 @@ void draw_status(void)
     /* Left: program name */
     mvwprintw(status_win, 0, 1, "TermTCP %s", VERSION);
 
-    /* Center: connection info */
+    /* Center: session indicator + connection info */
     char center[80];
+    int  nsess = session_count();
+    char sess_tag[16] = "";
+    if (nsess > 1)
+        snprintf(sess_tag, sizeof(sess_tag), "[%d/%d] ", session_index() + 1, nsess);
     if (S->connected && S->host_idx >= 0) {
         int elapsed = (int)(time(NULL) - S->connect_time);
-        snprintf(center, sizeof(center), "%s  [%02d:%02d]",
+        snprintf(center, sizeof(center), "%s%s  [%02d:%02d]",
-                 hosts[S->host_idx].name, elapsed / 60, elapsed % 60);
+                 sess_tag, hosts[S->host_idx].name, elapsed / 60, elapsed % 60);
     } else {
-        snprintf(center, sizeof(center), "Not Connected");
+        snprintf(center, sizeof(center), "%sNot Connected", sess_tag);
     }
     int cx = (COLS - (int)strlen(center)) / 2;
     if (cx > 0) mvwprintw(status_win, 0, cx, "%s", center);
@@ -861,12 +872,15 @@ static void draw_fkeys(void)
     static const struct { const char *key; const char *desc; } fkeys[] = {
         { "F1",  "Help"    },
         { "F3",  "Connect" },
-        { "F4",  "Disconnect" },
+        { "F4",  "Disc"    },
         { "F5",  "Forms"   },
         { "F6",  "Log"     },
+        { "F7",  "New Ses" },
+        { "F8",  "Prev"    },
+        { "F9",  "Next"    },
         { "F10", "Quit"    },
     };
-    static const int nfkeys = 6;
+    static const int nfkeys = 9;
 
     int col = 0;
     for (int i = 0; i < nfkeys && col < COLS - 2; i++) {
@@ -2607,6 +2621,73 @@ static void pktnet_checkin_form(void)
     force_repaint();
 }
 
+/* ═══════════════════════════════════════════════════════════
+ * Session management
+ * ═══════════════════════════════════════════════════════════ */
+
+static int session_count(void)
+{
+    int n = 0;
+    for (int i = 0; i < MAX_SESSIONS; i++)
+        if (sessions[i].active) n++;
+    return n;
+}
+
+static int session_index(void)   /* index of S in sessions[] */
+{
+    return (int)(S - sessions);
+}
+
+static void session_switch(int n)
+{
+    if (n < 0 || n >= MAX_SESSIONS || !sessions[n].active) return;
+    S = &sessions[n];
+    refresh_all();
+    draw_fkeys();
+}
+
+static void session_next(void)
+{
+    int cur = session_index();
+    for (int i = 1; i < MAX_SESSIONS; i++) {
+        int n = (cur + i) % MAX_SESSIONS;
+        if (sessions[n].active) { session_switch(n); return; }
+    }
+}
+
+static void session_prev(void)
+{
+    int cur = session_index();
+    for (int i = MAX_SESSIONS - 1; i > 0; i--) {
+        int n = (cur + i) % MAX_SESSIONS;
+        if (sessions[n].active) { session_switch(n); return; }
+    }
+}
+
+static void session_new(void)
+{
+    int slot = -1;
+    for (int i = 0; i < MAX_SESSIONS; i++)
+        if (!sessions[i].active) { slot = i; break; }
+    if (slot < 0) {
+        append_out("Max sessions reached (4).\n", 26, COLOR_PAIR(CP_YELLOW));
+        return;
+    }
+    int idx = pick_host("New Session — Select Host");
+    if (idx < 0) return;
+
+    memset(&sessions[slot], 0, sizeof(Session));
+    sessions[slot].active   = 1;
+    sessions[slot].sock     = -1;
+    sessions[slot].host_idx = -1;
+    sessions[slot].hist_pos = -1;
+    snprintf(sessions[slot].label, SESSION_LABEL, "Session %d", slot + 1);
+    S = &sessions[slot];
+    refresh_all();
+    draw_fkeys();
+    do_connect(idx);
+}
+
 /* ═══════════════════════════════════════════════════════════
  * Connect helper
  * ═══════════════════════════════════════════════════════════ */
@@ -2737,7 +2818,7 @@ static void forms_menu(void)
 
 static void ctrl_a_menu(void)
 {
-    int mh = 13, mw = 40;
+    int mh = 15, mw = 42;
     int my = (LINES-mh)/2; if (my<0) my=0;
     int mx = (COLS-mw)/2;  if (mx<0) mx=0;
 
@@ -2747,12 +2828,14 @@ static void ctrl_a_menu(void)
     mvwprintw(w, 0, (mw-14)/2, " TermTCP Menu ");
     mvwprintw(w, 2, 4, "C - Connect");
     mvwprintw(w, 3, 4, "D - Disconnect");
-    mvwprintw(w, 4, 4, "O - Config / Host Editor");
+    mvwprintw(w, 4, 4, "N - New Session");
-    mvwprintw(w, 5, 4, "M - Monitor Options");
+    mvwprintw(w, 5, 4, "1-4 Switch Session");
-    mvwprintw(w, 6, 4, "L - Toggle Log");
+    mvwprintw(w, 6, 4, "O - Config / Host Editor");
-    mvwprintw(w, 7, 4, "F - Forms & Check-Ins");
+    mvwprintw(w, 7, 4, "M - Monitor Options");
-    mvwprintw(w, 8, 4, "H - Help");
+    mvwprintw(w, 8, 4, "L - Toggle Log");
-    mvwprintw(w, 9, 4, "Q - Quit");
+    mvwprintw(w, 9, 4, "F - Forms & Check-Ins");
+    mvwprintw(w, 10, 4, "H - Help");
+    mvwprintw(w, 11, 4, "Q - Quit");
     mvwprintw(w, mh-2, 4, "Esc = close");
     wrefresh(w);
 
@@ -2808,6 +2891,14 @@ static void ctrl_a_menu(void)
         show_help();
         break;
 
+    case 'n':
+        session_new();
+        break;
+
+    case '1': case '2': case '3': case '4':
+        session_switch(ch - '1');
+        break;
+
     case 'q':
         if (S->connected) tcp_disconnect();
         if (S->logging)   close_log();
@@ -2867,6 +2958,18 @@ static void handle_key(int ch)
         draw_status();
         return;
 
+    case KEY_F(7):
+        session_new();
+        return;
+
+    case KEY_F(8):
+        session_prev();
+        return;
+
+    case KEY_F(9):
+        session_next();
+        return;
+
     case KEY_F(10):
         if (S->connected) tcp_disconnect();
         if (S->logging)   close_log();