Source:NetHack 3.6.0/include/lev.h

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 /* NetHack 3.6	lev.h	$NHDT-Date: 1432512781 2015/05/25 00:13:01 $  $NHDT-Branch: master $:$NHDT-Revision: 1.12 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
 /*	Common include file for save and restore routines */
 
 #ifndef LEV_H
 #define LEV_H
 
 #define COUNT_SAVE 0x1
 #define WRITE_SAVE 0x2
 #define FREE_SAVE 0x4
 
 #define MAX_BMASK 4
 
 /* operations of the various saveXXXchn & co. routines */
 #define perform_bwrite(mode) ((mode) & (COUNT_SAVE | WRITE_SAVE))
 #define release_data(mode) ((mode) &FREE_SAVE)
 
 /* The following are used in mkmaze.c */
 struct container {
     struct container *next;
     xchar x, y;
     short what;
     genericptr_t list;
 };
 
 #define CONS_OBJ 0
 #define CONS_MON 1
 #define CONS_HERO 2
 #define CONS_TRAP 3
 
 struct bubble {
     xchar x, y;   /* coordinates of the upper left corner */
     schar dx, dy; /* the general direction of the bubble's movement */
     uchar bm[MAX_BMASK + 2];    /* bubble bit mask */
     struct bubble *prev, *next; /* need to traverse the list up and down */
     struct container *cons;
 };
 
 /* used in light.c */
 typedef struct ls_t {
     struct ls_t *next;
     xchar x, y;  /* source's position */
     short range; /* source's current range */
     short flags;
     short type;  /* type of light source */
     anything id; /* source's identifier */
 } light_source;
 
 #endif /* LEV_H */