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author | John "Elwin" Edwards |
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date | Tue, 05 Sep 2023 20:05:24 -0400 |
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1 /* |
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2 bag.c - functions for dealing with bags |
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3 |
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4 UltraRogue: The Ultimate Adventure in the Dungeons of Doom |
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5 Copyright (C) 1986, 1992, 1993, 1995 Herb Chong |
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6 All rights reserved. |
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7 |
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8 See the file LICENSE.TXT for full copyright and licensing information. |
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9 */ |
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10 |
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11 /* |
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12 * new bag functions |
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13 * |
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14 * This is a simple version of bag.c that uses linked lists to perform the bag |
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15 * functions. The bag is just a linked list of objects (struct object) to be |
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16 * specific, but most of that is supposed to be hidden from the user, who |
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17 * should access the bag only through the functions presented here. |
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18 */ |
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19 |
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20 #include <stdlib.h> |
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21 #include "rogue.h" |
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22 |
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23 /* |
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24 * apply_to_bag |
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25 * |
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26 * This is the general bag manipulation routine. The bag is subjected to |
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27 * selection criteria and those objects which pass are processed by an action |
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28 * routine. The two criteria are type and filter function. The filter |
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29 * function returns TRUE if the object passes and FALSE otherwise. The filter |
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30 * function is passed the object and the user-supplied argument. This gives |
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31 * the user plenty of flexibility in determining which items will be |
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32 * processed. The action routine is passed the object, the id, and the |
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33 * user-supplied argument given to apply_to_bag. Specifying NULL for either |
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34 * the type or filter function means that criterion always selects. A NULL |
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35 * action routine means no processing is done and the first object which |
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36 * passes the filter is returned to the user. The action routine returns TRUE |
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37 * if processing should continue or FALSE if the current item should be |
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38 * returned to the caller. |
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39 * |
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40 * Returns NULL if the bag is empty or if nothing qualified. |
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41 * |
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42 * linked_list *bag_p; // linked list of objects |
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43 * int type; // what is its type (ARMOR, ...) |
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44 * int (*bff_p)(); // bag filter function |
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45 * int (*baf_p)(); // bag action routine |
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46 * long user_arg; // user argument for filter, action |
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47 * |
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48 */ |
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49 |
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50 struct object * |
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51 apply_to_bag(struct linked_list *bag_p, |
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52 int type, |
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53 int (*bff_p)(struct object *obj, bag_arg *user_arg), |
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54 int (*baf_p)(struct object *obj, bag_arg *user_arg, int id), |
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55 void *user_arg) |
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56 { |
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57 struct object *bag_obj_p = NULL; /* qualifying object */ |
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58 struct object *cur_obj_p; /* current object */ |
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59 bag_arg arg; |
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60 |
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61 arg.varg = user_arg; |
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62 |
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63 if (bag_p == NULL) |
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64 return (NULL); |
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65 |
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66 for (; bag_p != NULL; bag_p = next(bag_p)) |
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67 { |
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68 cur_obj_p = OBJPTR(bag_p); |
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69 |
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70 if (type != 0 && type != cur_obj_p->o_type) |
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71 continue; |
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72 |
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73 if (bff_p != NULL && !(*bff_p)(cur_obj_p, &arg)) |
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74 continue; |
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75 |
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76 /* |
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77 * At this point, we have an object which qualifies for |
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78 * processing |
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79 */ |
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80 |
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81 bag_obj_p = cur_obj_p; /* in case the user wants it */ |
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82 |
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83 if (baf_p != NULL && (*baf_p)(cur_obj_p, &arg, identifier(bag_obj_p))) |
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84 continue; |
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85 |
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86 /* |
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87 * We have an object which qualifies, quit now! |
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88 */ |
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89 |
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90 break; |
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91 } |
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92 |
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93 if (bag_p == NULL) |
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