| 1 | /* |
1 | /* |
| 2 | * This file is part of Crossfire TRT, the Roguelike Realtime MORPG. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
| 3 | * |
3 | * |
| 4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
| 5 | * |
5 | * |
| 6 | * Crossfire TRT 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 <crossfire@schmorp.de> |
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 PREFER_MALLOC |
26 | #include <compiler.h> |
| 26 | |
27 | |
| 27 | #if __GNUC__ >= 3 |
28 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
| 28 | # define is_constant(c) __builtin_constant_p (c) |
29 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
| 29 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
30 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
| 30 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
|
|
| 31 | #else |
|
|
| 32 | # define is_constant(c) 0 |
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|
| 33 | # define expect(expr,value) (expr) |
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| 34 | # define prefetch(addr,rw,locality) |
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| 35 | #endif |
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| 36 | |
31 | |
| 37 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
32 | #include <pthread.h> |
| 38 | # define decltype(x) typeof(x) |
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|
| 39 | #endif |
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| 40 | |
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| 41 | // put into ifs if you are very sure that the expression |
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| 42 | // is mostly true or mosty false. note that these return |
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| 43 | // booleans, not the expression. |
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| 44 | #define expect_false(expr) expect ((expr) != 0, 0) |
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| 45 | #define expect_true(expr) expect ((expr) != 0, 1) |
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| 46 | |
33 | |
| 47 | #include <cstddef> |
34 | #include <cstddef> |
| 48 | #include <cmath> |
35 | #include <cmath> |
| 49 | #include <new> |
36 | #include <new> |
| 50 | #include <vector> |
37 | #include <vector> |
| … | |
… | |
| 52 | #include <glib.h> |
39 | #include <glib.h> |
| 53 | |
40 | |
| 54 | #include <shstr.h> |
41 | #include <shstr.h> |
| 55 | #include <traits.h> |
42 | #include <traits.h> |
| 56 | |
43 | |
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|
44 | #if DEBUG_SALLOC |
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45 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
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46 | # define g_slice_alloc(s) debug_slice_alloc(s) |
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47 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
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48 | void *g_slice_alloc (unsigned long size); |
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49 | void *g_slice_alloc0 (unsigned long size); |
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50 | void g_slice_free1 (unsigned long size, void *ptr); |
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51 | #elif PREFER_MALLOC |
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52 | # define g_slice_alloc0(s) calloc (1, (s)) |
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53 | # define g_slice_alloc(s) malloc ((s)) |
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54 | # define g_slice_free1(s,p) free ((p)) |
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55 | #endif |
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56 | |
| 57 | // 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) |
| 58 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
| 59 | |
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 | |
| 60 | // very ugly macro that basicaly declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
| 61 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
| 62 | // 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 |
| 63 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
| 64 | // most ugly macro I ever wrote |
75 | // most ugly macro I ever wrote |
| 65 | #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) |
| … | |
… | |
| 70 | |
81 | |
| 71 | // in range excluding end |
82 | // in range excluding end |
| 72 | #define IN_RANGE_EXC(val,beg,end) \ |
83 | #define IN_RANGE_EXC(val,beg,end) \ |
| 73 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
84 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
| 74 | |
85 | |
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86 | void cleanup (const char *cause, bool make_core = false); |
| 75 | void fork_abort (const char *msg); |
87 | void fork_abort (const char *msg); |
| 76 | |
88 | |
| 77 | // 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, |
| 78 | // 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. |
| 79 | 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 (U)a < b ? (U)a : b; } |
| 80 | 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 (U)a > b ? (U)a : b; } |
| 81 | 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; } |
| 82 | |
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); } |
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98 | |
| 83 | 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; } |
| 84 | |
100 | |
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101 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
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102 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
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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 | template<typename T, typename U> |
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120 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
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121 | |
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122 | // div* only work correctly for div > 0 |
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123 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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124 | template<typename T> static inline T div (T val, T div) |
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125 | { |
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126 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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127 | } |
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128 | |
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129 | template<> inline float div (float val, float div) { return val / div; } |
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130 | template<> inline double div (double val, double div) { return val / div; } |
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131 | |
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132 | // div, round-up |
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133 | template<typename T> static inline T div_ru (T val, T div) |
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134 | { |
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135 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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136 | } |
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137 | // div, round-down |
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138 | template<typename T> static inline T div_rd (T val, T div) |
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139 | { |
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140 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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141 | } |
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142 | |
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143 | // lerp* only work correctly for min_in < max_in |
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144 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
| 85 | template<typename T> |
145 | template<typename T> |
| 86 | static inline T |
146 | static inline T |
| 87 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
147 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
| 88 | { |
148 | { |
| 89 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
149 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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150 | } |
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151 | |
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152 | // lerp, round-down |
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153 | template<typename T> |
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154 | static inline T |
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155 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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156 | { |
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157 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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158 | } |
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159 | |
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160 | // lerp, round-up |
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161 | template<typename T> |
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162 | static inline T |
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163 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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164 | { |
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165 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
| 90 | } |
166 | } |
| 91 | |
167 | |
| 92 | // lots of stuff taken from FXT |
168 | // lots of stuff taken from FXT |
| 93 | |
169 | |
| 94 | /* Rotate right. This is used in various places for checksumming */ |
170 | /* Rotate right. This is used in various places for checksumming */ |
| … | |
… | |
| 132 | int32_t d = b - a; |
208 | int32_t d = b - a; |
| 133 | d &= d >> 31; |
209 | d &= d >> 31; |
| 134 | return b - d; |
210 | return b - d; |
| 135 | } |
211 | } |
| 136 | |
212 | |
| 137 | // this is much faster than crossfires original algorithm |
213 | // this is much faster than crossfire's original algorithm |
| 138 | // on modern cpus |
214 | // on modern cpus |
| 139 | inline int |
215 | inline int |
| 140 | isqrt (int n) |
216 | isqrt (int n) |
| 141 | { |
217 | { |
| 142 | return (int)sqrtf ((float)n); |
218 | return (int)sqrtf ((float)n); |
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219 | } |
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220 | |
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221 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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222 | // more handy than it looks like, due to the implicit !! done on its arguments |
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223 | inline bool |
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224 | logical_xor (bool a, bool b) |
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225 | { |
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226 | return a != b; |
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227 | } |
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228 | |
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229 | inline bool |
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230 | logical_implies (bool a, bool b) |
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231 | { |
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232 | return a <= b; |
| 143 | } |
233 | } |
| 144 | |
234 | |
| 145 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
235 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
| 146 | #if 0 |
236 | #if 0 |
| 147 | // and has a max. error of 6 in the range -100..+100. |
237 | // and has a max. error of 6 in the range -100..+100. |
| … | |
… | |
| 172 | absdir (int d) |
262 | absdir (int d) |
| 173 | { |
263 | { |
| 174 | return ((d - 1) & 7) + 1; |
264 | return ((d - 1) & 7) + 1; |
| 175 | } |
265 | } |
| 176 | |
266 | |
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267 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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268 | #if GCC_VERSION(3,4) |
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269 | static inline int least_significant_bit (uint32_t x) |
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270 | { |
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271 | return __builtin_ctz (x); |
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272 | } |
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273 | #else |
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274 | int least_significant_bit (uint32_t x); |
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275 | #endif |
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276 | |
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277 | #define for_all_bits_sparse_32(mask, idxvar) \ |
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278 | for (uint32_t idxvar, mask_ = mask; \ |
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279 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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280 | |
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281 | extern ssize_t slice_alloc; // statistics |
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282 | |
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283 | void *salloc_ (int n) throw (std::bad_alloc); |
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284 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
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285 | |
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286 | // strictly the same as g_slice_alloc, but never returns 0 |
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287 | template<typename T> |
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288 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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289 | |
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290 | // also copies src into the new area, like "memdup" |
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291 | // if src is 0, clears the memory |
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292 | template<typename T> |
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293 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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294 | |
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295 | // clears the memory |
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296 | template<typename T> |
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297 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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298 | |
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299 | // for symmetry |
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300 | template<typename T> |
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301 | inline void sfree (T *ptr, int n = 1) throw () |
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302 | { |
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303 | if (expect_true (ptr)) |
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304 | { |
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305 | slice_alloc -= n * sizeof (T); |
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306 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
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307 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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308 | assert (slice_alloc >= 0);//D |
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309 | } |
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310 | } |
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311 | |
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312 | // nulls the pointer |
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313 | template<typename T> |
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314 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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315 | { |
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316 | sfree<T> (ptr, n); |
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317 | ptr = 0; |
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318 | } |
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319 | |
| 177 | // makes dynamically allocated objects zero-initialised |
320 | // makes dynamically allocated objects zero-initialised |
| 178 | struct zero_initialised |
321 | struct zero_initialised |
| 179 | { |
322 | { |
| 180 | void *operator new (size_t s, void *p) |
323 | void *operator new (size_t s, void *p) |
| 181 | { |
324 | { |
| … | |
… | |
| 183 | return p; |
326 | return p; |
| 184 | } |
327 | } |
| 185 | |
328 | |
| 186 | void *operator new (size_t s) |
329 | void *operator new (size_t s) |
| 187 | { |
330 | { |
| 188 | return g_slice_alloc0 (s); |
331 | return salloc0<char> (s); |
| 189 | } |
332 | } |
| 190 | |
333 | |
| 191 | void *operator new[] (size_t s) |
334 | void *operator new[] (size_t s) |
| 192 | { |
335 | { |
| 193 | return g_slice_alloc0 (s); |
336 | return salloc0<char> (s); |
| 194 | } |
337 | } |
| 195 | |
338 | |
| 196 | void operator delete (void *p, size_t s) |
339 | void operator delete (void *p, size_t s) |
| 197 | { |
340 | { |
| 198 | g_slice_free1 (s, p); |
341 | sfree ((char *)p, s); |
| 199 | } |
342 | } |
| 200 | |
343 | |
| 201 | void operator delete[] (void *p, size_t s) |
344 | void operator delete[] (void *p, size_t s) |
| 202 | { |
345 | { |
| 203 | g_slice_free1 (s, p); |
346 | sfree ((char *)p, s); |
| 204 | } |
347 | } |
| 205 | }; |
348 | }; |
| 206 | |
349 | |
| 207 | void *salloc_ (int n) throw (std::bad_alloc); |
350 | // makes dynamically allocated objects zero-initialised |
| 208 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
351 | struct slice_allocated |
| 209 | |
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| 210 | // strictly the same as g_slice_alloc, but never returns 0 |
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| 211 | template<typename T> |
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| 212 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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| 213 | |
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| 214 | // also copies src into the new area, like "memdup" |
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| 215 | // if src is 0, clears the memory |
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| 216 | template<typename T> |
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| 217 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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| 218 | |
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| 219 | // clears the memory |
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| 220 | template<typename T> |
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| 221 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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| 222 | |
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| 223 | // for symmetry |
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| 224 | template<typename T> |
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| 225 | inline void sfree (T *ptr, int n = 1) throw () |
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| 226 | { |
352 | { |
| 227 | #ifdef PREFER_MALLOC |
353 | void *operator new (size_t s, void *p) |
| 228 | free (ptr); |
354 | { |
| 229 | #else |
355 | return p; |
| 230 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
356 | } |
| 231 | #endif |
357 | |
| 232 | } |
358 | void *operator new (size_t s) |
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359 | { |
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360 | return salloc<char> (s); |
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361 | } |
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362 | |
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363 | void *operator new[] (size_t s) |
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364 | { |
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365 | return salloc<char> (s); |
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366 | } |
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367 | |
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368 | void operator delete (void *p, size_t s) |
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369 | { |
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370 | sfree ((char *)p, s); |
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371 | } |
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372 | |
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373 | void operator delete[] (void *p, size_t s) |
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374 | { |
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375 | sfree ((char *)p, s); |
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376 | } |
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377 | }; |
| 233 | |
378 | |
| 234 | // a STL-compatible allocator that uses g_slice |
379 | // a STL-compatible allocator that uses g_slice |
| 235 | // boy, this is verbose |
380 | // boy, this is verbose |
| 236 | template<typename Tp> |
381 | template<typename Tp> |
| 237 | struct slice_allocator |
382 | struct slice_allocator |
| … | |
… | |
| 249 | { |
394 | { |
| 250 | typedef slice_allocator<U> other; |
395 | typedef slice_allocator<U> other; |
| 251 | }; |
396 | }; |
| 252 | |
397 | |
| 253 | slice_allocator () throw () { } |
398 | slice_allocator () throw () { } |
| 254 | slice_allocator (const slice_allocator &o) throw () { } |
399 | slice_allocator (const slice_allocator &) throw () { } |
| 255 | template<typename Tp2> |
400 | template<typename Tp2> |
| 256 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
401 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
| 257 | |
402 | |
| 258 | ~slice_allocator () { } |
403 | ~slice_allocator () { } |
| 259 | |
404 | |
| … | |
… | |
| 268 | void deallocate (pointer p, size_type n) |
413 | void deallocate (pointer p, size_type n) |
| 269 | { |
414 | { |
| 270 | sfree<Tp> (p, n); |
415 | sfree<Tp> (p, n); |
| 271 | } |
416 | } |
| 272 | |
417 | |
| 273 | size_type max_size ()const throw () |
418 | size_type max_size () const throw () |
| 274 | { |
419 | { |
| 275 | return size_t (-1) / sizeof (Tp); |
420 | return size_t (-1) / sizeof (Tp); |
| 276 | } |
421 | } |
| 277 | |
422 | |
| 278 | void construct (pointer p, const Tp &val) |
423 | void construct (pointer p, const Tp &val) |
| … | |
… | |
| 283 | void destroy (pointer p) |
428 | void destroy (pointer p) |
| 284 | { |
429 | { |
| 285 | p->~Tp (); |
430 | p->~Tp (); |
| 286 | } |
431 | } |
| 287 | }; |
432 | }; |
| 288 | |
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| 289 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
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| 290 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
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| 291 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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| 292 | struct tausworthe_random_generator |
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| 293 | { |
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| 294 | // generator |
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| 295 | uint32_t state [4]; |
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| 296 | |
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| 297 | void operator =(const tausworthe_random_generator &src) |
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| 298 | { |
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| 299 | state [0] = src.state [0]; |
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| 300 | state [1] = src.state [1]; |
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| 301 | state [2] = src.state [2]; |
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| 302 | state [3] = src.state [3]; |
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| 303 | } |
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| 304 | |
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| 305 | void seed (uint32_t seed); |
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| 306 | uint32_t next (); |
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| 307 | |
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| 308 | // uniform distribution |
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| 309 | uint32_t operator ()(uint32_t num) |
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| 310 | { |
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| 311 | return is_constant (num) |
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| 312 | ? (next () * (uint64_t)num) >> 32U |
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| 313 | : get_range (num); |
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| 314 | } |
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| 315 | |
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| 316 | // return a number within (min .. max) |
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| 317 | int operator () (int r_min, int r_max) |
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| 318 | { |
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| 319 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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| 320 | ? r_min + operator ()(r_max - r_min + 1) |
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| 321 | : get_range (r_min, r_max); |
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| 322 | } |
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| 323 | |
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| 324 | double operator ()() |
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| 325 | { |
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| 326 | return this->next () / (double)0xFFFFFFFFU; |
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| 327 | } |
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| 328 | |
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| 329 | protected: |
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| 330 | uint32_t get_range (uint32_t r_max); |
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| 331 | int get_range (int r_min, int r_max); |
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| 332 | }; |
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| 333 | |
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| 334 | typedef tausworthe_random_generator rand_gen; |
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| 335 | |
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| 336 | extern rand_gen rndm; |
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| 337 | |
433 | |
| 338 | INTERFACE_CLASS (attachable) |
434 | INTERFACE_CLASS (attachable) |
| 339 | struct refcnt_base |
435 | struct refcnt_base |
| 340 | { |
436 | { |
| 341 | typedef int refcnt_t; |
437 | typedef int refcnt_t; |
| … | |
… | |
| 345 | MTH void refcnt_dec () const { --refcnt; } |
441 | MTH void refcnt_dec () const { --refcnt; } |
| 346 | |
442 | |
| 347 | refcnt_base () : refcnt (0) { } |
443 | refcnt_base () : refcnt (0) { } |
| 348 | }; |
444 | }; |
| 349 | |
445 | |
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|
446 | // to avoid branches with more advanced compilers |
| 350 | extern refcnt_base::refcnt_t refcnt_dummy; |
447 | extern refcnt_base::refcnt_t refcnt_dummy; |
| 351 | |
448 | |
| 352 | template<class T> |
449 | template<class T> |
| 353 | struct refptr |
450 | struct refptr |
| 354 | { |
451 | { |
| … | |
… | |
| 402 | typedef refptr<maptile> maptile_ptr; |
499 | typedef refptr<maptile> maptile_ptr; |
| 403 | typedef refptr<object> object_ptr; |
500 | typedef refptr<object> object_ptr; |
| 404 | typedef refptr<archetype> arch_ptr; |
501 | typedef refptr<archetype> arch_ptr; |
| 405 | typedef refptr<client> client_ptr; |
502 | typedef refptr<client> client_ptr; |
| 406 | typedef refptr<player> player_ptr; |
503 | typedef refptr<player> player_ptr; |
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504 | typedef refptr<region> region_ptr; |
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505 | |
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506 | #define STRHSH_NULL 2166136261 |
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507 | |
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508 | static inline uint32_t |
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509 | strhsh (const char *s) |
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510 | { |
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511 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
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512 | // it is about twice as fast as the one-at-a-time one, |
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513 | // with good distribution. |
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514 | // FNV-1a is faster on many cpus because the multiplication |
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515 | // runs concurrently with the looping logic. |
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516 | uint32_t hash = STRHSH_NULL; |
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517 | |
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518 | while (*s) |
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519 | hash = (hash ^ *s++) * 16777619U; |
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520 | |
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521 | return hash; |
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522 | } |
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523 | |
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524 | static inline uint32_t |
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525 | memhsh (const char *s, size_t len) |
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526 | { |
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527 | uint32_t hash = STRHSH_NULL; |
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528 | |
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529 | while (len--) |
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530 | hash = (hash ^ *s++) * 16777619U; |
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531 | |
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532 | return hash; |
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533 | } |
| 407 | |
534 | |
| 408 | struct str_hash |
535 | struct str_hash |
| 409 | { |
536 | { |
| 410 | std::size_t operator ()(const char *s) const |
537 | std::size_t operator ()(const char *s) const |
| 411 | { |
538 | { |
| 412 | unsigned long hash = 0; |
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| 413 | |
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| 414 | /* use the one-at-a-time hash function, which supposedly is |
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| 415 | * better than the djb2-like one used by perl5.005, but |
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| 416 | * certainly is better then the bug used here before. |
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| 417 | * see http://burtleburtle.net/bob/hash/doobs.html |
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| 418 | */ |
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| 419 | while (*s) |
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| 420 | { |
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| 421 | hash += *s++; |
|
|
| 422 | hash += hash << 10; |
|
|
| 423 | hash ^= hash >> 6; |
|
|
| 424 | } |
|
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| 425 | |
|
|
| 426 | hash += hash << 3; |
|
|
| 427 | hash ^= hash >> 11; |
|
|
| 428 | hash += hash << 15; |
|
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| 429 | |
|
|
| 430 | return hash; |
539 | return strhsh (s); |
|
|
540 | } |
|
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541 | |
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542 | std::size_t operator ()(const shstr &s) const |
|
|
543 | { |
|
|
544 | return strhsh (s); |
| 431 | } |
545 | } |
| 432 | }; |
546 | }; |
| 433 | |
547 | |
| 434 | struct str_equal |
548 | struct str_equal |
| 435 | { |
549 | { |
| … | |
… | |
| 528 | erase (&obj); |
642 | erase (&obj); |
| 529 | } |
643 | } |
| 530 | }; |
644 | }; |
| 531 | |
645 | |
| 532 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
646 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
647 | // returns the number of bytes actually used (including \0) |
| 533 | void assign (char *dst, const char *src, int maxlen); |
648 | int assign (char *dst, const char *src, int maxsize); |
| 534 | |
649 | |
| 535 | // type-safe version of assign |
650 | // type-safe version of assign |
| 536 | template<int N> |
651 | template<int N> |
| 537 | inline void assign (char (&dst)[N], const char *src) |
652 | inline int assign (char (&dst)[N], const char *src) |
| 538 | { |
653 | { |
| 539 | assign ((char *)&dst, src, N); |
654 | return assign ((char *)&dst, src, N); |
| 540 | } |
655 | } |
| 541 | |
656 | |
| 542 | typedef double tstamp; |
657 | typedef double tstamp; |
| 543 | |
658 | |
| 544 | // return current time as timestampe |
659 | // return current time as timestamp |
| 545 | tstamp now (); |
660 | tstamp now (); |
| 546 | |
661 | |
| 547 | int similar_direction (int a, int b); |
662 | int similar_direction (int a, int b); |
| 548 | |
663 | |
| 549 | // like printf, but returns a std::string |
664 | // like v?sprintf, but returns a "static" buffer |
| 550 | const std::string format (const char *format, ...); |
665 | char *vformat (const char *format, va_list ap); |
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666 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
| 551 | |
667 | |
|
|
668 | // safety-check player input which will become object->msg |
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669 | bool msg_is_safe (const char *msg); |
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670 | |
|
|
671 | ///////////////////////////////////////////////////////////////////////////// |
|
|
672 | // threads, very very thin wrappers around pthreads |
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673 | |
|
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674 | struct thread |
|
|
675 | { |
|
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676 | pthread_t id; |
|
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677 | |
|
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678 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
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679 | |
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680 | void cancel () |
|
|
681 | { |
|
|
682 | pthread_cancel (id); |
|
|
683 | } |
|
|
684 | |
|
|
685 | void *join () |
|
|
686 | { |
|
|
687 | void *ret; |
|
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688 | |
|
|
689 | if (pthread_join (id, &ret)) |
|
|
690 | cleanup ("pthread_join failed", 1); |
|
|
691 | |
|
|
692 | return ret; |
|
|
693 | } |
|
|
694 | }; |
|
|
695 | |
|
|
696 | // note that mutexes are not classes |
|
|
697 | typedef pthread_mutex_t smutex; |
|
|
698 | |
|
|
699 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
700 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
701 | #else |
|
|
702 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
| 552 | #endif |
703 | #endif |
| 553 | |
704 | |
|
|
705 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
706 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
707 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
708 | |
|
|
709 | typedef pthread_cond_t scond; |
|
|
710 | |
|
|
711 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
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712 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
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713 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
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714 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
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715 | |
|
|
716 | #endif |
|
|
717 | |
