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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * |
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6 | * Deliantra is free software: you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License as published by |
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8 | * the Free Software Foundation, either version 3 of the License, or |
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9 | * (at your option) any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU General Public License |
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17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | * |
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19 | * The authors can be reached via e-mail to <support@deliantra.net> |
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20 | */ |
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21 | |
1 | /* |
22 | /* |
2 | * shstr.C |
23 | * shstr.C |
3 | */ |
24 | */ |
4 | |
25 | |
5 | #include <cstring> |
26 | #include <cstring> |
6 | #include <cstdlib> |
27 | #include <cstdlib> |
7 | |
28 | #include <glib.h> |
8 | #include <tr1/unordered_set> |
29 | #include <tr1/unordered_set> |
9 | |
30 | |
10 | #include "shstr.h" |
31 | #include "global.h" |
11 | |
32 | |
12 | struct hash |
33 | size_t shstr_alloc; |
13 | { |
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14 | std::size_t operator ()(const char *s) const |
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15 | { |
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16 | unsigned long hash = 0; |
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17 | unsigned int i = 0; |
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18 | |
34 | |
19 | /* use the one-at-a-time hash function, which supposedly is |
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20 | * better than the djb2-like one used by perl5.005, but |
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21 | * certainly is better then the bug used here before. |
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22 | * see http://burtleburtle.net/bob/hash/doobs.html |
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23 | */ |
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24 | while (*s) |
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25 | { |
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26 | hash += *s++; |
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27 | hash += hash << 10; |
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28 | hash ^= hash >> 6; |
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29 | } |
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30 | |
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31 | hash += hash << 3; |
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32 | hash ^= hash >> 11; |
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33 | hash += hash << 15; |
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34 | |
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35 | return hash; |
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36 | } |
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37 | }; |
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38 | |
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39 | struct equal |
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40 | { |
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41 | bool operator ()(const char *a, const char *b) const |
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42 | { |
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43 | return !strcmp (a, b); |
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44 | } |
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45 | }; |
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46 | |
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47 | typedef std::tr1::unordered_set<const char *, hash, equal> HT; |
35 | typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *> > HT; |
48 | |
36 | |
49 | static HT ht; |
37 | static HT ht; |
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38 | static int next_gc; |
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39 | |
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40 | static const char * |
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41 | makevec (const char *s) |
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42 | { |
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43 | int len = strlen (s); |
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44 | |
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45 | shstr_alloc += sizeof (int) * 2 + len + 1; |
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46 | const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (int) * 2 + len + 1)); |
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47 | |
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48 | shstr::length (v) = len; |
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49 | shstr::refcnt (v) = 1; |
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50 | |
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51 | memcpy ((char *) v, s, len + 1); |
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52 | |
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53 | return v; |
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54 | } |
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55 | |
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56 | static const char * |
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57 | makenull () |
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58 | { |
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59 | const char *s = makevec ("(null)"); |
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60 | shstr::length (s) = 0; |
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61 | return s; |
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62 | } |
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63 | |
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64 | const char *shstr::null = makenull (); |
50 | |
65 | |
51 | const char * |
66 | const char * |
52 | shstr::find (const char *s) |
67 | shstr::find (const char *s) |
53 | { |
68 | { |
54 | if (!s) |
69 | if (!s) |
55 | return s; |
70 | return s; |
56 | |
71 | |
57 | HT::iterator i = ht.find (s); |
72 | auto (i, ht.find (s)); |
58 | |
73 | |
59 | return i != ht.end () |
74 | return i != ht.end ()? *i : 0; |
60 | ? (char *)*i |
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61 | : 0; |
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62 | } |
75 | } |
63 | |
76 | |
64 | const char * |
77 | const char * |
65 | shstr::intern (const char *s) |
78 | shstr::intern (const char *s) |
66 | { |
79 | { |
67 | if (!s) |
80 | if (!s) |
68 | return s; |
81 | return null; |
69 | |
82 | |
70 | if (const char *found = find (s)) |
83 | if (const char *found = find (s)) |
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84 | { |
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85 | ++refcnt (found); |
71 | return found; |
86 | return found; |
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87 | } |
72 | |
88 | |
73 | int len = strlen (s); |
89 | --next_gc; |
74 | |
90 | s = makevec (s); |
75 | int *v = (int *)malloc (sizeof (int) * 2 + len + 1); |
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76 | |
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77 | v [0] = len; |
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78 | v [1] = 0; |
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79 | |
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80 | v += 2; |
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81 | |
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82 | memcpy (v, s, len + 1); |
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83 | |
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84 | ht.insert ((char *)v); |
91 | ht.insert (s); |
85 | |
92 | return s; |
86 | return (char *)v; |
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87 | } |
93 | } |
88 | |
94 | |
89 | // TODO: periodically test refcounts == 0 for a few strings (e.g. one hash bucket, |
95 | // periodically test refcounts == 0 for a few strings |
90 | // exploiting the fatc that iterators stay valid for unordered_set). |
96 | // this is the ONLY thing that erases stuff from ht. keep it that way. |
91 | void |
97 | void |
92 | shstr::gc () |
98 | shstr::gc () |
93 | { |
99 | { |
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100 | if (expect_true (next_gc > 0)) |
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101 | return; |
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102 | |
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103 | static const char *curpos; |
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104 | |
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105 | auto (i, curpos ? ht.find (curpos) : ht.begin ()); |
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106 | |
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107 | if (i == ht.end ()) |
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108 | i = ht.begin (); |
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109 | |
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110 | int n = ht.size () / 256 + 16; |
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111 | next_gc += n >> 1; |
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112 | |
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113 | for (;;) |
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114 | { |
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115 | if (i == ht.end ()) |
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116 | { |
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117 | curpos = 0; |
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118 | return; |
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119 | } |
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120 | else if (!--n) |
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121 | break; |
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122 | else if (!refcnt (*i)) |
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123 | { |
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124 | auto (o, i++); |
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125 | const char *s = *o; |
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126 | |
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127 | ht.erase (o); |
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128 | |
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129 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
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130 | shstr_alloc -= sizeof (int) * 2 + length (s) + 1; |
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131 | g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s); |
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132 | } |
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133 | else |
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134 | ++i; |
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135 | } |
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136 | |
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137 | curpos = *i; |
94 | } |
138 | } |
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139 | |
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140 | const shstr shstr_null; |
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141 | |
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142 | // declare these here to get correct initialisation order |
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143 | #define def(str) const shstr shstr_ ## str (# str); |
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144 | # include "shstrinc.h" |
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145 | #undef def |
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146 | |
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147 | shstr skill_names[NUM_SKILLS]; |
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148 | |
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149 | //TODO: this should of course not be here |
95 | |
150 | |
96 | /* buf_overflow() - we don't want to exceed the buffer size of |
151 | /* buf_overflow() - we don't want to exceed the buffer size of |
97 | * buf1 by adding on buf2! Returns true if overflow will occur. |
152 | * buf1 by adding on buf2! Returns true if overflow will occur. |
98 | */ |
153 | */ |
99 | |
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100 | int |
154 | int |
101 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
155 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
102 | { |
156 | { |
103 | int len1 = 0, len2 = 0; |
157 | int len1 = 0, len2 = 0; |
104 | |
158 | |
105 | if (buf1) |
159 | if (buf1) |
106 | len1 = strlen (buf1); |
160 | len1 = strlen (buf1); |
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161 | |
107 | if (buf2) |
162 | if (buf2) |
108 | len2 = strlen (buf2); |
163 | len2 = strlen (buf2); |
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164 | |
109 | if ((len1 + len2) >= bufsize) |
165 | if ((len1 + len2) >= bufsize) |
110 | return 1; |
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111 | return 0; |
166 | return 1; |
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167 | |
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168 | return 0; |
112 | } |
169 | } |
113 | |
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