Mercurial > molko
annotate src/libmlk-rpg/rpg/inventory.c @ 402:d3fa956cdaf0
core: add alloc_sdupf
author | David Demelier <markand@malikania.fr> |
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date | Wed, 30 Mar 2022 15:06:55 +0200 |
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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) 2020-2022 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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48 |
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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 } |