Merge branch 'NetHack-3.6'

diff --cc src/mklev.c
index eeb74fa6c33c33f7de67effd76ff3d1299bfdc20,525e0a58e2f7026498e16a8989705443b27cc718..a0903be9db140c98f0e687f213ddf72b6b6b8e91
--- 1/src/mklev.c
--- 2/src/mklev.c
+++ b/src/mklev.c
@@@ -731,23 -733,23 +731,23 @@@ makelevel(
          debugpline0("trying to make a vault...");
          w = 1;
          h = 1;
 -        if (check_room(&vault_x, &w, &vault_y, &h, TRUE)) {
 +        if (check_room(&g.vault_x, &w, &g.vault_y, &h, TRUE)) {
   fill_vault:
-             add_room(g.vault_x, g.vault_y, g.vault_x + w, g.vault_y + h, TRUE, VAULT,
-                      FALSE);
 -            add_room(vault_x, vault_y, vault_x + w, vault_y + h,
++            add_room(g.vault_x, g.vault_y, g.vault_x + w, g.vault_y + h,
+                      TRUE, VAULT, FALSE);
 -            level.flags.has_vault = 1;
 +            g.level.flags.has_vault = 1;
              ++room_threshold;
 -            fill_room(&rooms[nroom - 1], FALSE);
 -            mk_knox_portal(vault_x + w, vault_y + h);
 -            if (!level.flags.noteleport && !rn2(3))
 +            fill_room(&g.rooms[g.nroom - 1], FALSE);
 +            mk_knox_portal(g.vault_x + w, g.vault_y + h);
 +            if (!g.level.flags.noteleport && !rn2(3))
                  makevtele();
          } else if (rnd_rect() && create_vault()) {
 -            vault_x = rooms[nroom].lx;
 -            vault_y = rooms[nroom].ly;
 -            if (check_room(&vault_x, &w, &vault_y, &h, TRUE))
 +            g.vault_x = g.rooms[g.nroom].lx;
 +            g.vault_y = g.rooms[g.nroom].ly;
 +            if (check_room(&g.vault_x, &w, &g.vault_y, &h, TRUE))
                  goto fill_vault;
              else
 -                rooms[nroom].hx = -1;
 +                g.rooms[g.nroom].hx = -1;
          }
      }
  
@@@ -1679,22 -1681,30 +1679,30 @@@ struct mkroom *croom
  #define y_maze_min 2
  
  /*
-  * Major level transmutation: add a set of stairs (to the Sanctum) after
-  * an earthquake that leaves behind a a new topology, centered at g.inv_pos.
+  * Major level transmutation:  add a set of stairs (to the Sanctum) after
+  * an earthquake that leaves behind a new topology, centered at inv_pos.
 - * Assumes there are no rooms within the invocation area and that inv_pos
 + * Assumes there are no rooms within the invocation area and that g.inv_pos
   * is not too close to the edge of the map.  Also assume the hero can see,
   * which is guaranteed for normal play due to the fact that sight is needed
-  * to read the Book of the Dead.
+  * to read the Book of the Dead.  [That assumption is not valid; it is
+  * possible that "the Book reads the hero" rather than vice versa if
+  * attempted while blind (in order to make blind-from-birth conduct viable).]
   */
  void
  mkinvokearea()
  {
      int dist;
-     xchar xmin = g.inv_pos.x, xmax = g.inv_pos.x;
-     xchar ymin = g.inv_pos.y, ymax = g.inv_pos.y;
 -    xchar xmin = inv_pos.x, xmax = inv_pos.x,
 -          ymin = inv_pos.y, ymax = inv_pos.y;
++    xchar xmin = g.inv_pos.x, xmax = g.inv_pos.x,
++          ymin = g.inv_pos.y, ymax = g.inv_pos.y;
      register xchar i;
  
+     /* slightly odd if levitating, but not wrong */
      pline_The("floor shakes violently under you!");
+     /*
+      * TODO:
+      *  Suppress this message if player has dug out all the walls
+      *  that would otherwise be affected.
+      */
      pline_The("walls around you begin to bend and crumble!");
      display_nhwindow(WIN_MESSAGE, TRUE);
  
@@@ -1752,9 -1762,8 +1760,8 @@@ int dist
  
      /* clip at existing map borders if necessary */
      if (!within_bounded_area(x, y, x_maze_min + 1, y_maze_min + 1,
 -                             x_maze_max - 1, y_maze_max - 1)) {
 +                             g.x_maze_max - 1, g.y_maze_max - 1)) {
-         /* only outermost 2 columns and/or rows may be truncated due to edge
-          */
+         /* outermost 2 columns and/or rows may be truncated due to edge */
          if (dist < (7 - 2))
              panic("mkinvpos: <%d,%d> (%d) off map edge!", x, y, dist);
          return;