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annotate libmlk-rpg/mlk/rpg/inventory.c @ 514:daf085bf8a8c

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misc: fix build
author David Demelier <markand@malikania.fr>
date Sat, 04 Mar 2023 10:49:20 +0100
parents 773a082f0b91
children
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1 /*
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2 * inventory.c -- item inventory
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3 *
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4 * Copyright (c) 2020-2023 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <stddef.h>
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21
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22 #include "inventory.h"
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23
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24 static struct inventory_slot *
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25 find(struct inventory *iv, const struct item *item)
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26 {
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27 for (size_t i = 0; i < INVENTORY_ITEM_MAX; ++i)
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28 if (iv->items[i].item == item)
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29 return &iv->items[i];
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30
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31 return NULL;
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32 }
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33
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34 int
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35 inventory_add(struct inventory *iv, const struct item *item, unsigned int amount)
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36 {
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37 assert(iv);
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38 assert(item);
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39
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40 struct inventory_slot *slot;
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41
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42 /* Find one existing, otherwise find one empty. */
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43 if (!(slot = find(iv, item)))
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44 slot = find(iv, NULL);
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45
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46 if (!slot)
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47 return 0;
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49 slot->item = item;
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50 slot->amount += amount;
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51
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52 return -1;
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53 }
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54
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55 void
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56 inventory_consume(struct inventory *iv, const struct item *item, unsigned int amount)
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57 {
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58 assert(iv);
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59 assert(item);
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60
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61 struct inventory_slot *slot;
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62
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63 if ((slot = find(iv, item))) {
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64 slot->amount -= amount;
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65
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66 if (slot->amount == 0)
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67 slot->item = NULL;
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68 }
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69 }