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annotate urogue/dict.c @ 295:1e1c81fbb533

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Rogue V5: fix elemental wands. Bolts often failed to hit, due to some struct members not being initialized. Reported by 'LazyCat' from RogueTemple.
author John "Elwin" Edwards
date Fri, 12 Jan 2018 18:02:39 -0500
parents c495a4f288c6
children 13b482bd9e66
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1 /*
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2 dict.c
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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) 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 ** Change history:
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13 **
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14 ** (AK:04/03/95) - In dict_create, initialize hook for extensions to dictionary structure.
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15 ** (AK:04/04/95) - In dict_insert, only set any_ptr when a new string entry is created.
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16 ** (AK:04/17/95) - Added dict_union and dict_merge.
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17 ** (AK:04/18/95) - In dict_create, added code to create signature,
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18 ** table of contents, and parameter array.
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19 ** (AK:04/18/95) - Revised dict_load, dict_save
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20 ** (AK:04/18/95) - Added dict_import
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21 **
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22 ******************/
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23
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24 static char sccsid[] = "%W% %G%";
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25
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26 #include <stdlib.h>
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27 #include <string.h>
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28 #if !defined(OS2) && !defined(_WIN32)
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29 #include <unistd.h>
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30 #endif
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31
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32 #include "dict.h"
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33 #include "dictutil.h"
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34
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35 #define BUFLEN 300
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36
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37 /*************************************************************************
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38 * Generic dictionary and hash table functions for word and
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39 * string storage.
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40 *
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41 * Implements generic dictionary management by using a
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42 * hash table with direct chaining. All terms are stored in a
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43 * separate, unsorted, string table. When inserting into the
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44 * hash table exceeds the current size, allocate a new hash table
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45 * and rehash the old contents into the new table. When the string
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46 * table fills, append more empty entries onto the old table and
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47 * continue adding. Inserting a string that already exists increments
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48 * the count for the string. Deleting a string only decrements the
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49 * count to no less than 0. This will allow a 0 occurence string to be
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50 * retrieved. To remove the 0 occurence string table entries, you must
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51 * rebuild the dictionary. Merging from one dictionary to a new one will
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52 * do this because it only copies nonzero occurences.
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53 *
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54 * Assumptions:
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55 * unsigned long >= 32 bits
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56 * int >= 16 bits
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57 * char == 8 bits
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58 * number of entries < 2^28
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59 *************************************************************************/
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60
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61 /*************************************************************************
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62 * hash_string: calculate hash value for string, modified
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63 * version of hashpjw() from the new Dragon book.
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64 *
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65 * s - string to calculate hash for
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66 *
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67 * Returns: hash value
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68 *************************************************************************/
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69 static unsigned long hash_string(const char *s)
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70 {
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71 unsigned long h = 0;
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72 unsigned long g = 0;
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73
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74 while (*s) {
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75 h <<= 4;
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76 h += *s++;
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77 if ((g = h & 0xf0000000) != 0)
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78 h ^= g >> 24;
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79 }
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80 return h ^ g;
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81 }
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82
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83 /*************************************************************************
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84 * dict_create: create a dictionary and initialize its structures
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85 *
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86 * toc_size - number of entries in table of contents ( >= 4 )
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87 * initial_string_count - number of strings to hold as initial allocation
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88 * initial_hash_chains - size of hash table, must be power of 4
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89 * max_chain_length - max number of elements in hash chain before signalling growth
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90 *
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91 * Returns: pointer to dictionary
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92 * NULL - error creating dictionary
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