From c67973638f894abb061178acd54d1b34101872ab Mon Sep 17 00:00:00 2001
From: jiehaoxuan <3113993691@qq.com>
Date: Sun, 3 Dec 2023 20:43:46 +0800
Subject: [PATCH] dbridge.c wh

---
 src/NetHack_3.7/src/dbridge.c | 58 ++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 31 deletions(-)

diff --git a/src/NetHack_3.7/src/dbridge.c b/src/NetHack_3.7/src/dbridge.c
index 9855ca0..c10a809 100644
--- a/src/NetHack_3.7/src/dbridge.c
+++ b/src/NetHack_3.7/src/dbridge.c
@@ -1,3 +1,4 @@
+//2023/12/3 wh 
 /* NetHack 3.7	dbridge.c	$NHDT-Date: 1596498153 2020/08/03 23:42:33 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.47 $ */
 /*      Copyright (c) 1989 by Jean-Christophe Collet              */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -58,72 +59,67 @@ is_pool(coordxy x, coordxy y)
     return FALSE;
 }
 
-boolean
-is_lava(coordxy x, coordxy y)
+boolean is_lava(coordxy x, coordxy y)
 {
     schar ltyp;
 
-    if (!isok(x, y))
-        return FALSE;
-    ltyp = levl[x][y].typ;
+    if (!isok(x, y))  // If the coordinates are not within the game map
+        return FALSE;  // Return FALSE to indicate that it is not lava
+    ltyp = levl[x][y].typ;  // Get the terrain type at the coordinates
     if (ltyp == LAVAPOOL || ltyp == LAVAWALL
         || (ltyp == DRAWBRIDGE_UP
             && (levl[x][y].drawbridgemask & DB_UNDER) == DB_LAVA))
-        return TRUE;
-    return FALSE;
+        return TRUE;  // Return TRUE if the terrain type is lava or a drawbridge over lava
+    return FALSE;  // Otherwise, return FALSE
 }
 
-boolean
-is_pool_or_lava(coordxy x, coordxy y)
+boolean is_pool_or_lava(coordxy x, coordxy y)
 {
     if (is_pool(x, y) || is_lava(x, y))
-        return TRUE;
+        return TRUE;  // Return TRUE if the location is a pool or lava
     else
-        return FALSE;
+        return FALSE;  // Otherwise, return FALSE
 }
 
-boolean
-is_ice(coordxy x, coordxy y)
+boolean is_ice(coordxy x, coordxy y)
 {
     schar ltyp;
 
-    if (!isok(x, y))
-        return FALSE;
-    ltyp = levl[x][y].typ;
+    if (!isok(x, y))  // If the coordinates are not within the game map
+        return FALSE;  // Return FALSE to indicate that it is not ice
+    ltyp = levl[x][y].typ;  // Get the terrain type at the coordinates
     if (ltyp == ICE || (ltyp == DRAWBRIDGE_UP
                         && (levl[x][y].drawbridgemask & DB_UNDER) == DB_ICE))
-        return TRUE;
-    return FALSE;
+        return TRUE;  // Return TRUE if the terrain type is ice or a drawbridge over ice
+    return FALSE;  // Otherwise, return FALSE
 }
 
-boolean
-is_moat(coordxy x, coordxy y)
+boolean is_moat(coordxy x, coordxy y)
 {
     schar ltyp;
 
-    if (!isok(x, y))
-        return FALSE;
-    ltyp = levl[x][y].typ;
+    if (!isok(x, y))  // If the coordinates are not within the game map
+        return FALSE;  // Return FALSE to indicate that it is not a moat
+    ltyp = levl[x][y].typ;  // Get the terrain type at the coordinates
     if (!Is_juiblex_level(&u.uz)
         && (ltyp == MOAT
             || (ltyp == DRAWBRIDGE_UP
                 && (levl[x][y].drawbridgemask & DB_UNDER) == DB_MOAT)))
-        return TRUE;
-    return FALSE;
+        return TRUE;  // Return TRUE if the terrain type is a moat or a drawbridge over a moat (excluding Juiblex's level)
+    return FALSE;  // Otherwise, return FALSE
 }
 
-schar
-db_under_typ(int mask)
+schar db_under_typ(int mask)
 {
     switch (mask & DB_UNDER) {
     case DB_ICE:
-        return ICE;
+        return ICE;  // Return the terrain type as ice if the mask corresponds to ice
     case DB_LAVA:
-        return LAVAPOOL;
+        return LAVAPOOL;  // Return the terrain type as lava if the mask corresponds to lava
     case DB_MOAT:
-        return MOAT;
+        return MOAT;  // Return the terrain type as a moat if the mask corresponds to a moat
     default:
-        return STONE;
+        return STONE;  // Return the terrain type as stone for other cases
     }
 }