git.pond.sub.org Git - empserver/blob - src/lib/update/nxtitemp.c

   1 /*
   2  *  Empire - A multi-player, client/server Internet based war game.
   3  *  Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                           Ken Stevens, Steve McClure
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ---
  21  *
  22  *  See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
  23  *  related information and legal notices. It is expected that any future
  24  *  projects/authors will amend these files as needed.
  25  *
  26  *  ---
  27  *
  28  *  nxtitemp.c: Get next item from list
  29  *
  30  *  Known contributors to this file:
  31  *     Dave Pare, 1989
  32  */
  33
  34 #include "misc.h"
  35 #include "var.h"
  36 #include "xy.h"
  37 #include "plane.h"
  38 #include "ship.h"
  39 #include "nuke.h"
  40 #include "land.h"
  41 #include "nsc.h"
  42 #include "nat.h"
  43 #include "file.h"
  44 #include "genitem.h"
  45 #include "player.h"
  46 #include "update.h"
  47 #include "gen.h"
  48 #include "common.h"
  49
  50 s_char *
  51 nxtitemp(struct nstr_item *np, int owner)
  52 {
  53         struct  genitem *gp;
  54         int     selected;
  55
  56         if (np->sel == NS_UNDEF)
  57                 return 0;
  58         do {
  59                 if (np->sel == NS_LIST) {
  60                         np->index++;
  61                         if (np->index >= np->size)
  62                                 return 0;
  63                         np->cur = np->list[np->index];
  64                 } else {
  65                         np->cur++;
  66                 }
  67                 gp = (struct genitem *)ef_ptr(np->type,np->cur);
  68                 if (gp == (struct genitem *)0)
  69                         return 0;
  70
  71                 selected = 1;
  72                 switch (np->sel) {
  73                 /*
  74                  * This one won't work unless you're running in emp_player
  75                  *
  76                  */
  77                 case NS_LIST:
  78                         if ((np->flags & EFF_OWNER) && !owner)
  79                                 selected = 0;
  80                         break;
  81                 case NS_ALL:
  82                         /* XXX maybe combine NS_LIST and NS_ALL later */
  83                         break;
  84                 case NS_DIST:
  85                         if (!xyinrange(gp->x, gp->y, &np->range)) {
  86                                 selected = 0;
  87                                 break;
  88                         }
  89                         np->curdist = mapdist((int)gp->x, (int)gp->y,
  90                                 (int)np->cx, (int)np->cy);
  91                         if (np->curdist > np->dist)
  92                                 selected = 0;
  93                         break;
  94                 case NS_AREA:
  95                         if (!xyinrange(gp->x, gp->y, &np->range))
  96                                 selected = 0;
  97                         if (gp->x == np->range.hx || gp->y == np->range.hy)
  98                                 selected = 0;
  99                         break;
 100                 case NS_XY:
 101                         if (xnorm(gp->x) != np->cx || ynorm(gp->y) != np->cy)
 102                                 selected = 0;
 103                         break;
 104                 case NS_GROUP:
 105                         if (np->group != gp->group)
 106                                 selected = 0;
 107                         break;
 108                 default:
 109                         logerror("nxtitemp: bad selector %d\n", np->sel);
 110                         return 0;
 111                 }
 112                 if (selected && np->ncond) {
 113                         /* nstr_exec is expensive, so we do it last */
 114                         if (!nstr_exec(np->cond, np->ncond, (s_char *)gp, np->type))
 115                                 selected = 0;
 116                 }
 117         } while (!selected);
 118         return (s_char *)gp;
 119 }