| 1 | /* |
1 | /* |
| 2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
| 3 | * |
3 | * |
| 4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
| 5 | * |
5 | * |
| 6 | * Deliantra is free software: you can redistribute it and/or modify |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
| 7 | * it under the terms of the GNU General Public License as published by |
7 | * the terms of the Affero GNU General Public License as published by the |
| 8 | * the Free Software Foundation, either version 3 of the License, or |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
| 9 | * (at your option) any later version. |
9 | * option) any later version. |
| 10 | * |
10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
14 | * GNU General Public License for more details. |
| 15 | * |
15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
16 | * You should have received a copy of the Affero GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
17 | * and the GNU General Public License along with this program. If not, see |
|
|
18 | * <http://www.gnu.org/licenses/>. |
| 18 | * |
19 | * |
| 19 | * The authors can be reached via e-mail to <support@deliantra.net> |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
| 20 | */ |
21 | */ |
| 21 | |
22 | |
| 22 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
| 23 | #define UTIL_H__ |
24 | #define UTIL_H__ |
| 24 | |
25 | |
| 25 | #define DEBUG_SALLOC 0 |
26 | #include <compiler.h> |
| 26 | #define PREFER_MALLOC 0 |
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| 27 | |
27 | |
| 28 | #if __GNUC__ >= 3 |
28 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
| 29 | # define is_constant(c) __builtin_constant_p (c) |
29 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
| 30 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
30 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
| 31 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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| 32 | #else |
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| 33 | # define is_constant(c) 0 |
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| 34 | # define expect(expr,value) (expr) |
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| 35 | # define prefetch(addr,rw,locality) |
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| 36 | #endif |
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| 37 | |
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| 38 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
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| 39 | # define decltype(x) typeof(x) |
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| 40 | #endif |
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| 41 | |
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| 42 | // put into ifs if you are very sure that the expression |
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| 43 | // is mostly true or mosty false. note that these return |
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| 44 | // booleans, not the expression. |
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| 45 | #define expect_false(expr) expect ((expr) != 0, 0) |
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| 46 | #define expect_true(expr) expect ((expr) != 0, 1) |
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| 47 | |
31 | |
| 48 | #include <pthread.h> |
32 | #include <pthread.h> |
| 49 | |
33 | |
| 50 | #include <cstddef> |
34 | #include <cstddef> |
| 51 | #include <cmath> |
35 | #include <cmath> |
| … | |
… | |
| 71 | #endif |
55 | #endif |
| 72 | |
56 | |
| 73 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
| 74 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
| 75 | |
59 | |
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60 | #if cplusplus_does_not_suck |
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61 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
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62 | template<typename T, int N> |
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63 | static inline int array_length (const T (&arr)[N]) |
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64 | { |
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65 | return N; |
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66 | } |
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67 | #else |
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68 | #define array_length(name) (sizeof (name) / sizeof (name [0])) |
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69 | #endif |
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70 | |
| 76 | // very ugly macro that basicaly declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
| 77 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
| 78 | // works only for stuff that can be assigned 0 and converts to false |
73 | // works only for stuff that can be assigned 0 and converts to false |
| 79 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
| 80 | // most ugly macro I ever wrote |
75 | // most ugly macro I ever wrote |
| 81 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
76 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
| … | |
… | |
| 91 | void cleanup (const char *cause, bool make_core = false); |
86 | void cleanup (const char *cause, bool make_core = false); |
| 92 | void fork_abort (const char *msg); |
87 | void fork_abort (const char *msg); |
| 93 | |
88 | |
| 94 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
89 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
| 95 | // as a is often a constant while b is the variable. it is still a bug, though. |
90 | // as a is often a constant while b is the variable. it is still a bug, though. |
| 96 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
91 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
| 97 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
92 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
| 98 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
93 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
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94 | |
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95 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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96 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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97 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } |
| 99 | |
98 | |
| 100 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
99 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
| 101 | |
100 | |
| 102 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
101 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
| 103 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
102 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
| 104 | |
103 | |
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104 | // sign returns -1 or +1 |
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105 | template<typename T> |
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106 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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107 | // relies on 2c representation |
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108 | template<> |
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109 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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110 | template<> |
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111 | inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); } |
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112 | template<> |
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113 | inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); } |
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114 | |
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115 | // sign0 returns -1, 0 or +1 |
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116 | template<typename T> |
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117 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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118 | |
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119 | //clashes with C++0x |
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120 | template<typename T, typename U> |
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121 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
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122 | |
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123 | // div* only work correctly for div > 0 |
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124 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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125 | template<typename T> static inline T div (T val, T div) |
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126 | { |
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127 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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128 | } |
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129 | |
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130 | template<> inline float div (float val, float div) { return val / div; } |
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131 | template<> inline double div (double val, double div) { return val / div; } |
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132 | |
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133 | // div, round-up |
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134 | template<typename T> static inline T div_ru (T val, T div) |
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135 | { |
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136 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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137 | } |
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138 | // div, round-down |
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139 | template<typename T> static inline T div_rd (T val, T div) |
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140 | { |
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141 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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142 | } |
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143 | |
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144 | // lerp* only work correctly for min_in < max_in |
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145 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
| 105 | template<typename T> |
146 | template<typename T> |
| 106 | static inline T |
147 | static inline T |
| 107 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
148 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
| 108 | { |
149 | { |
| 109 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
150 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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151 | } |
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152 | |
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153 | // lerp, round-down |
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154 | template<typename T> |
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155 | static inline T |
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156 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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157 | { |
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158 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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159 | } |
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160 | |
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161 | // lerp, round-up |
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162 | template<typename T> |
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163 | static inline T |
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164 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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165 | { |
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166 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
| 110 | } |
167 | } |
| 111 | |
168 | |
| 112 | // lots of stuff taken from FXT |
169 | // lots of stuff taken from FXT |
| 113 | |
170 | |
| 114 | /* Rotate right. This is used in various places for checksumming */ |
171 | /* Rotate right. This is used in various places for checksumming */ |
| … | |
… | |
| 152 | int32_t d = b - a; |
209 | int32_t d = b - a; |
| 153 | d &= d >> 31; |
210 | d &= d >> 31; |
| 154 | return b - d; |
211 | return b - d; |
| 155 | } |
212 | } |
| 156 | |
213 | |
| 157 | // this is much faster than crossfires original algorithm |
214 | // this is much faster than crossfire's original algorithm |
| 158 | // on modern cpus |
215 | // on modern cpus |
| 159 | inline int |
216 | inline int |
| 160 | isqrt (int n) |
217 | isqrt (int n) |
| 161 | { |
218 | { |
| 162 | return (int)sqrtf ((float)n); |
219 | return (int)sqrtf ((float)n); |
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220 | } |
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221 | |
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222 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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223 | // more handy than it looks like, due to the implicit !! done on its arguments |
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224 | inline bool |
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225 | logical_xor (bool a, bool b) |
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226 | { |
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227 | return a != b; |
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228 | } |
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229 | |
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230 | inline bool |
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231 | logical_implies (bool a, bool b) |
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232 | { |
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233 | return a <= b; |
| 163 | } |
234 | } |
| 164 | |
235 | |
| 165 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
236 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
| 166 | #if 0 |
237 | #if 0 |
| 167 | // and has a max. error of 6 in the range -100..+100. |
238 | // and has a max. error of 6 in the range -100..+100. |
| … | |
… | |
| 181 | #else |
252 | #else |
| 182 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
253 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
| 183 | #endif |
254 | #endif |
| 184 | } |
255 | } |
| 185 | |
256 | |
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257 | // can be substantially faster than floor, if your value range allows for it |
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258 | template<typename T> |
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259 | inline T |
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260 | fastfloor (T x) |
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261 | { |
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262 | return std::floor (x); |
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263 | } |
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264 | |
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265 | inline float |
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266 | fastfloor (float x) |
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267 | { |
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268 | return sint32(x) - (x < 0); |
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269 | } |
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270 | |
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271 | inline double |
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272 | fastfloor (double x) |
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273 | { |
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274 | return sint64(x) - (x < 0); |
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275 | } |
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276 | |
| 186 | /* |
277 | /* |
| 187 | * absdir(int): Returns a number between 1 and 8, which represent |
278 | * absdir(int): Returns a number between 1 and 8, which represent |
| 188 | * the "absolute" direction of a number (it actually takes care of |
279 | * the "absolute" direction of a number (it actually takes care of |
| 189 | * "overflow" in previous calculations of a direction). |
280 | * "overflow" in previous calculations of a direction). |
| 190 | */ |
281 | */ |
| … | |
… | |
| 192 | absdir (int d) |
283 | absdir (int d) |
| 193 | { |
284 | { |
| 194 | return ((d - 1) & 7) + 1; |
285 | return ((d - 1) & 7) + 1; |
| 195 | } |
286 | } |
| 196 | |
287 | |
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288 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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289 | #if GCC_VERSION(3,4) |
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290 | static inline int least_significant_bit (uint32_t x) |
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291 | { |
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292 | return __builtin_ctz (x); |
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293 | } |
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294 | #else |
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295 | int least_significant_bit (uint32_t x); |
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296 | #endif |
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297 | |
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298 | #define for_all_bits_sparse_32(mask, idxvar) \ |
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299 | for (uint32_t idxvar, mask_ = mask; \ |
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300 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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301 | |
| 197 | extern ssize_t slice_alloc; // statistics |
302 | extern ssize_t slice_alloc; // statistics |
| 198 | |
303 | |
| 199 | void *salloc_ (int n) throw (std::bad_alloc); |
304 | void *salloc_ (int n) throw (std::bad_alloc); |
| 200 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
305 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
| 201 | |
306 | |
| … | |
… | |
| 217 | inline void sfree (T *ptr, int n = 1) throw () |
322 | inline void sfree (T *ptr, int n = 1) throw () |
| 218 | { |
323 | { |
| 219 | if (expect_true (ptr)) |
324 | if (expect_true (ptr)) |
| 220 | { |
325 | { |
| 221 | slice_alloc -= n * sizeof (T); |
326 | slice_alloc -= n * sizeof (T); |
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327 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
| 222 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
328 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
| 223 | assert (slice_alloc >= 0);//D |
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| 224 | } |
329 | } |
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330 | } |
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331 | |
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332 | // nulls the pointer |
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333 | template<typename T> |
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334 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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335 | { |
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336 | sfree<T> (ptr, n); |
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337 | ptr = 0; |
| 225 | } |
338 | } |
| 226 | |
339 | |
| 227 | // makes dynamically allocated objects zero-initialised |
340 | // makes dynamically allocated objects zero-initialised |
| 228 | struct zero_initialised |
341 | struct zero_initialised |
| 229 | { |
342 | { |
| … | |
… | |
| 239 | } |
352 | } |
| 240 | |
353 | |
| 241 | void *operator new[] (size_t s) |
354 | void *operator new[] (size_t s) |
| 242 | { |
355 | { |
| 243 | return salloc0<char> (s); |
356 | return salloc0<char> (s); |
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357 | } |
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358 | |
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359 | void operator delete (void *p, size_t s) |
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360 | { |
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361 | sfree ((char *)p, s); |
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362 | } |
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363 | |
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364 | void operator delete[] (void *p, size_t s) |
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365 | { |
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366 | sfree ((char *)p, s); |
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367 | } |
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368 | }; |
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369 | |
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370 | // makes dynamically allocated objects zero-initialised |
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371 | struct slice_allocated |
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372 | { |
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373 | void *operator new (size_t s, void *p) |
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374 | { |
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375 | return p; |
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376 | } |
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377 | |
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378 | void *operator new (size_t s) |
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379 | { |
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380 | return salloc<char> (s); |
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381 | } |
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382 | |
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383 | void *operator new[] (size_t s) |
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384 | { |
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385 | return salloc<char> (s); |
| 244 | } |
386 | } |
| 245 | |
387 | |
| 246 | void operator delete (void *p, size_t s) |
388 | void operator delete (void *p, size_t s) |
| 247 | { |
389 | { |
| 248 | sfree ((char *)p, s); |
390 | sfree ((char *)p, s); |
| … | |
… | |
| 307 | { |
449 | { |
| 308 | p->~Tp (); |
450 | p->~Tp (); |
| 309 | } |
451 | } |
| 310 | }; |
452 | }; |
| 311 | |
453 | |
| 312 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
454 | // basically a memory area, but refcounted |
| 313 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
455 | struct refcnt_buf |
| 314 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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| 315 | struct tausworthe_random_generator |
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| 316 | { |
456 | { |
| 317 | // generator |
457 | char *data; |
| 318 | uint32_t state [4]; |
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| 319 | |
458 | |
| 320 | void operator =(const tausworthe_random_generator &src) |
459 | refcnt_buf (size_t size = 0); |
| 321 | { |
460 | refcnt_buf (void *data, size_t size); |
| 322 | state [0] = src.state [0]; |
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| 323 | state [1] = src.state [1]; |
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| 324 | state [2] = src.state [2]; |
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| 325 | state [3] = src.state [3]; |
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| 326 | } |
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| 327 | |
461 | |
| 328 | void seed (uint32_t seed); |
462 | refcnt_buf (const refcnt_buf &src) |
| 329 | uint32_t next (); |
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| 330 | |
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| 331 | // uniform distribution |
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| 332 | uint32_t operator ()(uint32_t num) |
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| 333 | { |
463 | { |
| 334 | return is_constant (num) |
464 | data = src.data; |
| 335 | ? (next () * (uint64_t)num) >> 32U |
465 | ++_refcnt (); |
| 336 | : get_range (num); |
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| 337 | } |
466 | } |
| 338 | |
467 | |
| 339 | // return a number within (min .. max) |
468 | ~refcnt_buf (); |
| 340 | int operator () (int r_min, int r_max) |
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| 341 | { |
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| 342 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
|
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| 343 | ? r_min + operator ()(r_max - r_min + 1) |
|
|
| 344 | : get_range (r_min, r_max); |
|
|
| 345 | } |
|
|
| 346 | |
469 | |
| 347 | double operator ()() |
470 | refcnt_buf &operator =(const refcnt_buf &src); |
|
|
471 | |
|
|
472 | operator char *() |
| 348 | { |
473 | { |
| 349 | return this->next () / (double)0xFFFFFFFFU; |
474 | return data; |
|
|
475 | } |
|
|
476 | |
|
|
477 | size_t size () const |
|
|
478 | { |
|
|
479 | return _size (); |
| 350 | } |
480 | } |
| 351 | |
481 | |
| 352 | protected: |
482 | protected: |
| 353 | uint32_t get_range (uint32_t r_max); |
483 | enum { |
| 354 | int get_range (int r_min, int r_max); |
484 | overhead = sizeof (unsigned int) * 2 |
| 355 | }; |
485 | }; |
| 356 | |
486 | |
| 357 | typedef tausworthe_random_generator rand_gen; |
487 | unsigned int &_size () const |
|
|
488 | { |
|
|
489 | return ((unsigned int *)data)[-2]; |
|
|
490 | } |
| 358 | |
491 | |
| 359 | extern rand_gen rndm; |
492 | unsigned int &_refcnt () const |
|
|
493 | { |
|
|
494 | return ((unsigned int *)data)[-1]; |
|
|
495 | } |
|
|
496 | |
|
|
497 | void _alloc (unsigned int size) |
|
|
498 | { |
|
|
499 | data = ((char *)salloc<char> (size + overhead)) + overhead; |
|
|
500 | _size () = size; |
|
|
501 | _refcnt () = 1; |
|
|
502 | } |
|
|
503 | |
|
|
504 | void dec () |
|
|
505 | { |
|
|
506 | if (!--_refcnt ()) |
|
|
507 | sfree<char> (data - overhead, size () + overhead); |
|
|
508 | } |
|
|
509 | }; |
| 360 | |
510 | |
| 361 | INTERFACE_CLASS (attachable) |
511 | INTERFACE_CLASS (attachable) |
| 362 | struct refcnt_base |
512 | struct refcnt_base |
| 363 | { |
513 | { |
| 364 | typedef int refcnt_t; |
514 | typedef int refcnt_t; |
| … | |
… | |
| 426 | typedef refptr<maptile> maptile_ptr; |
576 | typedef refptr<maptile> maptile_ptr; |
| 427 | typedef refptr<object> object_ptr; |
577 | typedef refptr<object> object_ptr; |
| 428 | typedef refptr<archetype> arch_ptr; |
578 | typedef refptr<archetype> arch_ptr; |
| 429 | typedef refptr<client> client_ptr; |
579 | typedef refptr<client> client_ptr; |
| 430 | typedef refptr<player> player_ptr; |
580 | typedef refptr<player> player_ptr; |
|
|
581 | typedef refptr<region> region_ptr; |
|
|
582 | |
|
|
583 | #define STRHSH_NULL 2166136261 |
|
|
584 | |
|
|
585 | static inline uint32_t |
|
|
586 | strhsh (const char *s) |
|
|
587 | { |
|
|
588 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
|
|
589 | // it is about twice as fast as the one-at-a-time one, |
|
|
590 | // with good distribution. |
|
|
591 | // FNV-1a is faster on many cpus because the multiplication |
|
|
592 | // runs concurrently with the looping logic. |
|
|
593 | // we modify the hash a bit to improve its distribution |
|
|
594 | uint32_t hash = STRHSH_NULL; |
|
|
595 | |
|
|
596 | while (*s) |
|
|
597 | hash = (hash ^ *s++) * 16777619U; |
|
|
598 | |
|
|
599 | return hash ^ (hash >> 16); |
|
|
600 | } |
|
|
601 | |
|
|
602 | static inline uint32_t |
|
|
603 | memhsh (const char *s, size_t len) |
|
|
604 | { |
|
|
605 | uint32_t hash = STRHSH_NULL; |
|
|
606 | |
|
|
607 | while (len--) |
|
|
608 | hash = (hash ^ *s++) * 16777619U; |
|
|
609 | |
|
|
610 | return hash; |
|
|
611 | } |
| 431 | |
612 | |
| 432 | struct str_hash |
613 | struct str_hash |
| 433 | { |
614 | { |
| 434 | std::size_t operator ()(const char *s) const |
615 | std::size_t operator ()(const char *s) const |
| 435 | { |
616 | { |
| 436 | unsigned long hash = 0; |
|
|
| 437 | |
|
|
| 438 | /* use the one-at-a-time hash function, which supposedly is |
|
|
| 439 | * better than the djb2-like one used by perl5.005, but |
|
|
| 440 | * certainly is better then the bug used here before. |
|
|
| 441 | * see http://burtleburtle.net/bob/hash/doobs.html |
|
|
| 442 | */ |
|
|
| 443 | while (*s) |
|
|
| 444 | { |
|
|
| 445 | hash += *s++; |
|
|
| 446 | hash += hash << 10; |
|
|
| 447 | hash ^= hash >> 6; |
|
|
| 448 | } |
|
|
| 449 | |
|
|
| 450 | hash += hash << 3; |
|
|
| 451 | hash ^= hash >> 11; |
|
|
| 452 | hash += hash << 15; |
|
|
| 453 | |
|
|
| 454 | return hash; |
617 | return strhsh (s); |
|
|
618 | } |
|
|
619 | |
|
|
620 | std::size_t operator ()(const shstr &s) const |
|
|
621 | { |
|
|
622 | return strhsh (s); |
| 455 | } |
623 | } |
| 456 | }; |
624 | }; |
| 457 | |
625 | |
| 458 | struct str_equal |
626 | struct str_equal |
| 459 | { |
627 | { |
| … | |
… | |
| 486 | } |
654 | } |
| 487 | }; |
655 | }; |
| 488 | |
656 | |
| 489 | // This container blends advantages of linked lists |
657 | // This container blends advantages of linked lists |
| 490 | // (efficiency) with vectors (random access) by |
658 | // (efficiency) with vectors (random access) by |
| 491 | // by using an unordered vector and storing the vector |
659 | // using an unordered vector and storing the vector |
| 492 | // index inside the object. |
660 | // index inside the object. |
| 493 | // |
661 | // |
| 494 | // + memory-efficient on most 64 bit archs |
662 | // + memory-efficient on most 64 bit archs |
| 495 | // + O(1) insert/remove |
663 | // + O(1) insert/remove |
| 496 | // + free unique (but varying) id for inserted objects |
664 | // + free unique (but varying) id for inserted objects |
| … | |
… | |
| 533 | insert (&obj); |
701 | insert (&obj); |
| 534 | } |
702 | } |
| 535 | |
703 | |
| 536 | void erase (T *obj) |
704 | void erase (T *obj) |
| 537 | { |
705 | { |
| 538 | unsigned int pos = obj->*indexmember; |
706 | object_vector_index pos = obj->*indexmember; |
| 539 | obj->*indexmember = 0; |
707 | obj->*indexmember = 0; |
| 540 | |
708 | |
| 541 | if (pos < this->size ()) |
709 | if (pos < this->size ()) |
| 542 | { |
710 | { |
| 543 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
711 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
| … | |
… | |
| 551 | { |
719 | { |
| 552 | erase (&obj); |
720 | erase (&obj); |
| 553 | } |
721 | } |
| 554 | }; |
722 | }; |
| 555 | |
723 | |
|
|
724 | ///////////////////////////////////////////////////////////////////////////// |
|
|
725 | |
|
|
726 | // something like a vector or stack, but without |
|
|
727 | // out of bounds checking |
|
|
728 | template<typename T> |
|
|
729 | struct fixed_stack |
|
|
730 | { |
|
|
731 | T *data; |
|
|
732 | int size; |
|
|
733 | int max; |
|
|
734 | |
|
|
735 | fixed_stack () |
|
|
736 | : size (0), data (0) |
|
|
737 | { |
|
|
738 | } |
|
|
739 | |
|
|
740 | fixed_stack (int max) |
|
|
741 | : size (0), max (max) |
|
|
742 | { |
|
|
743 | data = salloc<T> (max); |
|
|
744 | } |
|
|
745 | |
|
|
746 | void reset (int new_max) |
|
|
747 | { |
|
|
748 | sfree (data, max); |
|
|
749 | size = 0; |
|
|
750 | max = new_max; |
|
|
751 | data = salloc<T> (max); |
|
|
752 | } |
|
|
753 | |
|
|
754 | void free () |
|
|
755 | { |
|
|
756 | sfree (data, max); |
|
|
757 | data = 0; |
|
|
758 | } |
|
|
759 | |
|
|
760 | ~fixed_stack () |
|
|
761 | { |
|
|
762 | sfree (data, max); |
|
|
763 | } |
|
|
764 | |
|
|
765 | T &operator[](int idx) |
|
|
766 | { |
|
|
767 | return data [idx]; |
|
|
768 | } |
|
|
769 | |
|
|
770 | void push (T v) |
|
|
771 | { |
|
|
772 | data [size++] = v; |
|
|
773 | } |
|
|
774 | |
|
|
775 | T &pop () |
|
|
776 | { |
|
|
777 | return data [--size]; |
|
|
778 | } |
|
|
779 | |
|
|
780 | T remove (int idx) |
|
|
781 | { |
|
|
782 | T v = data [idx]; |
|
|
783 | |
|
|
784 | data [idx] = data [--size]; |
|
|
785 | |
|
|
786 | return v; |
|
|
787 | } |
|
|
788 | }; |
|
|
789 | |
|
|
790 | ///////////////////////////////////////////////////////////////////////////// |
|
|
791 | |
| 556 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
792 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
793 | // returns the number of bytes actually used (including \0) |
| 557 | void assign (char *dst, const char *src, int maxlen); |
794 | int assign (char *dst, const char *src, int maxsize); |
| 558 | |
795 | |
| 559 | // type-safe version of assign |
796 | // type-safe version of assign |
| 560 | template<int N> |
797 | template<int N> |
| 561 | inline void assign (char (&dst)[N], const char *src) |
798 | inline int assign (char (&dst)[N], const char *src) |
| 562 | { |
799 | { |
| 563 | assign ((char *)&dst, src, N); |
800 | return assign ((char *)&dst, src, N); |
| 564 | } |
801 | } |
| 565 | |
802 | |
| 566 | typedef double tstamp; |
803 | typedef double tstamp; |
| 567 | |
804 | |
| 568 | // return current time as timestamp |
805 | // return current time as timestamp |
| 569 | tstamp now (); |
806 | tstamp now (); |
| 570 | |
807 | |
| 571 | int similar_direction (int a, int b); |
808 | int similar_direction (int a, int b); |
| 572 | |
809 | |
| 573 | // like sprintf, but returns a "static" buffer |
810 | // like v?sprintf, but returns a "static" buffer |
| 574 | const char *format (const char *format, ...); |
811 | char *vformat (const char *format, va_list ap); |
|
|
812 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
|
|
813 | |
|
|
814 | // safety-check player input which will become object->msg |
|
|
815 | bool msg_is_safe (const char *msg); |
| 575 | |
816 | |
| 576 | ///////////////////////////////////////////////////////////////////////////// |
817 | ///////////////////////////////////////////////////////////////////////////// |
| 577 | // threads, very very thin wrappers around pthreads |
818 | // threads, very very thin wrappers around pthreads |
| 578 | |
819 | |
| 579 | struct thread |
820 | struct thread |
