107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/* NetHack 3.7 track.c $NHDT-Date: 1596498219 2020/08/03 23:43:39 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.12 $ */
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/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
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/*-Copyright (c) Kenneth Lorber, Kensington, Maryland, 2015. */
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/* NetHack may be freely redistributed. See license for details. */
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/* track.c - version 1.0.2 */
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#include "hack.h"
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#define UTSZ 100
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static NEARDATA int utcnt, utpnt;
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static NEARDATA coord utrack[UTSZ];
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void
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initrack(void)
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{
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utcnt = utpnt = 0;
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(void) memset((genericptr_t) &utrack, 0, sizeof(utrack));
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}
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/* add to track */
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void
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settrack(void)
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{
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if (utcnt < UTSZ)
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utcnt++;
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if (utpnt == UTSZ)
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utpnt = 0;
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utrack[utpnt].x = u.ux;
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utrack[utpnt].y = u.uy;
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utpnt++;
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}
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/* get a track coord on or next to x,y and last tracked by hero,
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returns null if no such track */
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coord *
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gettrack(coordxy x, coordxy y)
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{
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int cnt, ndist;
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coord *tc;
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cnt = utcnt;
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for (tc = &utrack[utpnt]; cnt--;) {
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if (tc == utrack)
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tc = &utrack[UTSZ - 1];
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else
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tc--;
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ndist = distmin(x, y, tc->x, tc->y);
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if (ndist <= 1)
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return (ndist ? tc : 0);
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}
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return (coord *) 0;
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}
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/* return TRUE if x,y has hero tracks on it */
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boolean
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hastrack(coordxy x, coordxy y)
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{
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int i;
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for (i = 0; i < utcnt; i++)
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if (utrack[i].x == x && utrack[i].y == y)
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return TRUE;
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return FALSE;
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}
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/* save the hero tracking info */
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void
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save_track(NHFILE *nhfp)
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{
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if (perform_bwrite(nhfp)) {
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if (nhfp->structlevel) {
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int i;
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bwrite(nhfp->fd, (genericptr_t) &utcnt, sizeof utcnt);
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bwrite(nhfp->fd, (genericptr_t) &utpnt, sizeof utpnt);
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for (i = 0; i < utcnt; i++) {
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bwrite(nhfp->fd, (genericptr_t) &utrack[i].x, sizeof utrack[i].x);
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bwrite(nhfp->fd, (genericptr_t) &utrack[i].y, sizeof utrack[i].y);
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}
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}
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}
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if (release_data(nhfp))
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initrack();
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}
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/* restore the hero tracking info */
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void
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rest_track(NHFILE *nhfp)
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{
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if (nhfp->structlevel) {
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int i;
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mread(nhfp->fd, (genericptr_t) &utcnt, sizeof utcnt);
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mread(nhfp->fd, (genericptr_t) &utpnt, sizeof utpnt);
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if (utcnt > UTSZ || utpnt > UTSZ)
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panic("rest_track: impossible pt counts");
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for (i = 0; i < utcnt; i++) {
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mread(nhfp->fd, (genericptr_t) &utrack[i].x, sizeof utrack[i].x);
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mread(nhfp->fd, (genericptr_t) &utrack[i].y, sizeof utrack[i].y);
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}
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}
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}
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/*track.c*/
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