osc: implement change window title and icon

csi.c

@@ -274,7 +274,7 @@ csi_as_string(struct terminal *term, uint8_t final)
                       i == term->vt.params.idx - 1 ? "" : ";");
     }
 
-    c += snprintf(&msg[c], sizeof(msg) - c, "%c (%d parameters)",
+    c += snprintf(&msg[c], sizeof(msg) - c, "%c (%zu parameters)",
                   final, term->vt.params.idx);
     return msg;
 }

main.c

@@ -819,6 +819,13 @@ keyboard_repeater(void *arg)
     return 1;
 }
 
+/* TODO: move to a render API? */
+void
+render_set_title(struct renderer *renderer, const char *title)
+{
+    xdg_toplevel_set_title(renderer->xdg_toplevel, title);
+}
+
 int
 main(int argc, char *const *argv)
 {
@@ -965,10 +972,11 @@ main(int argc, char *const *argv)
     xdg_surface_add_listener(c.wl.xdg_surface, &xdg_surface_listener, &c);
 
     c.wl.xdg_toplevel = xdg_surface_get_toplevel(c.wl.xdg_surface);
+    c.term.renderer.xdg_toplevel = c.wl.xdg_toplevel; /* TODO */
     xdg_toplevel_add_listener(c.wl.xdg_toplevel, &xdg_toplevel_listener, &c);
 
     xdg_toplevel_set_app_id(c.wl.xdg_toplevel, "f00ter");
-    xdg_toplevel_set_title(c.wl.xdg_toplevel, "f00ter");
+    render_set_title(&c.term.renderer, "f00ter");
 
     wl_surface_commit(c.wl.surface);
     wl_display_roundtrip(c.wl.display);

osc.c

@@ -1,12 +1,51 @@
 #include "osc.h"
+#include <ctype.h>
+#include "terminal.h"
 
 #define LOG_MODULE "osc"
 #define LOG_ENABLE_DBG 0
 #include "log.h"
 
+/* TODO */
+void render_set_title(struct renderer *renderer, const char *title);
+
 bool
 osc_dispatch(struct terminal *term)
 {
-    LOG_DBG("OCS: %.*s", (int)term->vt.osc.idx, term->vt.osc.data);
+    int param = 0;
+    int data_ofs = 0;
+
+    for (size_t i = 0; i < term->vt.osc.idx; i++) {
+        int c = term->vt.osc.data[i];
+
+        if (c == ';') {
+            data_ofs = i + 1;
+            break;
+        }
+
+        if (!isdigit(c)) {
+            LOG_ERR("OSC: invalid parameter: %.*s",
+                    (int)term->vt.osc.idx, term->vt.osc.data);
+            return false;
+        }
+
+        param += c - '0';
+    }
+    LOG_DBG("OCS: %.*s (param = %d)",
+            (int)term->vt.osc.idx, term->vt.osc.data, param);
+
+    const char *string = (const char *)&term->vt.osc.data[data_ofs];
+
+    switch (param) {
+    case 0: render_set_title(&term->renderer, string); break;  /* icon + title */
+    case 1: break;                                             /* icon */
+    case 2: render_set_title(&term->renderer, string); break;  /* title */
+
+    default:
+        LOG_ERR("unimplemented: OSC: %.*s",
+                (int)term->vt.osc.idx, term->vt.osc.data);
+        return false;
+    }
+
     return true;
 }

terminal.h

@@ -74,7 +74,7 @@ struct grid {
 
 struct vt_subparams {
     unsigned value[16];
-    int idx;
+    size_t idx;
 };
 
 struct vt_param {
@@ -86,20 +86,20 @@ struct vt {
     int state;  /* enum state */
     struct {
         struct vt_param v[16];
-        int idx;
+        size_t idx;
     } params;
     struct {
         uint8_t data[2];
-        int idx;
+        size_t idx;
     } intermediates;
     struct {
         uint8_t data[1024];
-        int idx;
+        size_t idx;
     } osc;
     struct {
         uint8_t data[4];
-        int idx;
+        size_t idx;
-        int left;
+        size_t left;
     } utf8;
     struct attributes attrs;
     struct attributes saved_attrs;
@@ -125,6 +125,10 @@ struct kbd {
     } repeat;
 };
 
+struct renderer {
+    struct xdg_toplevel *xdg_toplevel; /* TODO: this doesn't belong here */
+};
+
 enum decckm { DECCKM_CSI, DECCKM_SS3 };
 enum keypad_mode { KEYPAD_NUMERICAL, KEYPAD_APPLICATION };
 enum charset { CHARSET_ASCII, CHARSET_GRAPHIC };
@@ -145,6 +149,7 @@ struct terminal {
 
     struct vt vt;
     struct kbd kbd;
+    struct renderer renderer;
 
     int cols;
     int rows;

vt.c

@@ -799,10 +799,13 @@ action(struct terminal *term, enum action action, uint8_t c)
         break;
 
     case ACTION_OSC_PUT:
-        term->vt.osc.data[term->vt.osc.idx++] = c;
+        if (term->vt.osc.idx < (int)sizeof(term->vt.osc.data) - 1)
+            term->vt.osc.data[term->vt.osc.idx++] = c;
         break;
 
     case ACTION_OSC_END:
+        assert(term->vt.osc.idx < sizeof(term->vt.osc.data));
+        term->vt.osc.data[term->vt.osc.idx] = '\0';
         return osc_dispatch(term);
 
     case ACTION_HOOK: