[termdesc] copy only palette entries we actually read

src/lib/in.c

@@ -1285,6 +1285,9 @@ palette_cb(inputctx* ictx){
       logerror("empty palette string\n");
     }else{
       if(get_default_color(str, &ictx->initdata->palette.chans[idx]) == 0){
+        if((int)idx > ictx->initdata->maxpaletteread){
+          ictx->initdata->maxpaletteread = idx;
+        }
         loginfo("index %u 0x%06x\n", idx, ictx->initdata->palette.chans[idx]);
       }
       free(str);
@@ -1609,6 +1612,7 @@ create_inputctx(tinfo* ti, FILE* infp, int lmargin, int tmargin, int rmargin,
                             i->initdata->qterm = ti->qterm;
                             i->initdata->cursory = -1;
                             i->initdata->cursorx = -1;
+                            i->initdata->maxpaletteread = -1;
                             i->iread = i->iwrite = i->ivalid = 0;
                             i->cread = i->cwrite = i->cvalid = 0;
                             i->initdata->kbdlevel = UINT_MAX;

src/lib/in.h

@@ -78,6 +78,7 @@ struct initial_responses {
   char* version;               // version string, heap-allocated
   unsigned kbdlevel;           // enabled kitty keyboard functions
   ncpalette palette;           // palette entries
+  int maxpaletteread;          // maximum palette index read
 };
 
 // Blocking call. Waits until the input thread has processed all responses to

src/lib/termdesc.c

@@ -998,6 +998,7 @@ int interrogate_terminfo(tinfo* ti, FILE* out, unsigned utf8,
   ti->bg_collides_default = 0xfe000000;
   ti->fg_default = 0xff000000;
   ti->kbdlevel = UINT_MAX; // see comment in tinfo definition
+  ti->maxpaletteread = -1;
   ti->qterm = TERMINAL_UNKNOWN;
   // we don't need a controlling tty for everything we do; allow a failure here
   ti->ttyfd = get_tty_fd(out);
@@ -1233,7 +1234,11 @@ int interrogate_terminfo(tinfo* ti, FILE* out, unsigned utf8,
       ti->dimy = iresp->dimy;
       ti->dimx = iresp->dimx;
     }
-    memcpy(&ti->originalpalette, &iresp->palette, sizeof(ti->originalpalette));
+    if(iresp->maxpaletteread >= 0){
+      memcpy(ti->originalpalette.chans, iresp->palette.chans,
+             sizeof(*ti->originalpalette.chans) * (iresp->maxpaletteread + 1));
+      ti->maxpaletteread = iresp->maxpaletteread;
+    }
     if(iresp->rgb){
       ti->caps.rgb = true;
     }

src/lib/termdesc.h

@@ -185,6 +185,7 @@ typedef struct tinfo {
   int default_cols;          // COLUMNS environment var / cols terminfo / 80
 
   ncpalette originalpalette; // palette as read from initial queries
+  int maxpaletteread;        // maximum palette entry read
   pthread_t gpmthread;       // thread handle for GPM watcher
   int gpmfd;                 // connection to GPM daemon
   char mouseproto;           // DECSET level (100x, '0', '2', '3')