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1 | /* |
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2 | * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
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5 | * |
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6 | * Crossfire TRT is free software; you can redistribute it and/or modify it |
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7 | * under the terms of the GNU General Public License as published by the Free |
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8 | * Software Foundation; either version 2 of the License, or (at your option) |
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9 | * 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, but |
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12 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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13 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 | * 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 along |
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17 | * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 |
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18 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | * |
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20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
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21 | */ |
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22 | |
| 1 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
| 2 | #define UTIL_H__ |
24 | #define UTIL_H__ |
| 3 | |
25 | |
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26 | //#define PREFER_MALLOC |
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27 | |
| 4 | #if __GNUC__ >= 3 |
28 | #if __GNUC__ >= 3 |
| 5 | # define is_constant(c) __builtin_constant_p (c) |
29 | # define is_constant(c) __builtin_constant_p (c) |
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30 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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31 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
| 6 | #else |
32 | #else |
| 7 | # define is_constant(c) 0 |
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) |
| 8 | #endif |
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 | |
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48 | #include <cstddef> |
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49 | #include <cmath> |
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50 | #include <new> |
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51 | #include <vector> |
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52 | |
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53 | #include <glib.h> |
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54 | |
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55 | #include <shstr.h> |
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56 | #include <traits.h> |
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57 | |
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58 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
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59 | #define auto(var,expr) decltype(expr) var = (expr) |
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60 | |
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61 | // very ugly macro that basicaly declares and initialises a variable |
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62 | // that is in scope for the next statement only |
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63 | // works only for stuff that can be assigned 0 and converts to false |
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64 | // (note: works great for pointers) |
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65 | // most ugly macro I ever wrote |
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66 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
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67 | |
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68 | // in range including end |
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69 | #define IN_RANGE_INC(val,beg,end) \ |
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70 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
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71 | |
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72 | // in range excluding end |
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73 | #define IN_RANGE_EXC(val,beg,end) \ |
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74 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
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75 | |
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76 | void fork_abort (const char *msg); |
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77 | |
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78 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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79 | // as a is often a constant while b is the variable. it is still a bug, though. |
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80 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
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81 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
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82 | 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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83 | |
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84 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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85 | |
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86 | template<typename T> |
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87 | static inline T |
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88 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
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89 | { |
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90 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
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91 | } |
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92 | |
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93 | // lots of stuff taken from FXT |
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94 | |
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95 | /* Rotate right. This is used in various places for checksumming */ |
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96 | //TODO: that sucks, use a better checksum algo |
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97 | static inline uint32_t |
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98 | rotate_right (uint32_t c, uint32_t count = 1) |
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99 | { |
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100 | return (c << (32 - count)) | (c >> count); |
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101 | } |
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102 | |
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103 | static inline uint32_t |
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104 | rotate_left (uint32_t c, uint32_t count = 1) |
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105 | { |
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106 | return (c >> (32 - count)) | (c << count); |
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107 | } |
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108 | |
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109 | // Return abs(a-b) |
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110 | // Both a and b must not have the most significant bit set |
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111 | static inline uint32_t |
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112 | upos_abs_diff (uint32_t a, uint32_t b) |
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113 | { |
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114 | long d1 = b - a; |
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115 | long d2 = (d1 & (d1 >> 31)) << 1; |
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116 | |
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117 | return d1 - d2; // == (b - d) - (a + d); |
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118 | } |
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119 | |
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120 | // Both a and b must not have the most significant bit set |
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121 | static inline uint32_t |
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122 | upos_min (uint32_t a, uint32_t b) |
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123 | { |
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124 | int32_t d = b - a; |
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125 | d &= d >> 31; |
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126 | return a + d; |
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127 | } |
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128 | |
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129 | // Both a and b must not have the most significant bit set |
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130 | static inline uint32_t |
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131 | upos_max (uint32_t a, uint32_t b) |
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132 | { |
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133 | int32_t d = b - a; |
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134 | d &= d >> 31; |
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135 | return b - d; |
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136 | } |
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137 | |
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138 | // this is much faster than crossfires original algorithm |
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139 | // on modern cpus |
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140 | inline int |
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141 | isqrt (int n) |
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142 | { |
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143 | return (int)sqrtf ((float)n); |
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144 | } |
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145 | |
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146 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
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147 | #if 0 |
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148 | // and has a max. error of 6 in the range -100..+100. |
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149 | #else |
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150 | // and has a max. error of 9 in the range -100..+100. |
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151 | #endif |
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152 | inline int |
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153 | idistance (int dx, int dy) |
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154 | { |
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155 | unsigned int dx_ = abs (dx); |
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156 | unsigned int dy_ = abs (dy); |
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157 | |
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158 | #if 0 |
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159 | return dx_ > dy_ |
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160 | ? (dx_ * 61685 + dy_ * 26870) >> 16 |
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161 | : (dy_ * 61685 + dx_ * 26870) >> 16; |
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162 | #else |
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163 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
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164 | #endif |
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165 | } |
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166 | |
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167 | /* |
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168 | * absdir(int): Returns a number between 1 and 8, which represent |
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169 | * the "absolute" direction of a number (it actually takes care of |
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170 | * "overflow" in previous calculations of a direction). |
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171 | */ |
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172 | inline int |
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173 | absdir (int d) |
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174 | { |
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175 | return ((d - 1) & 7) + 1; |
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176 | } |
| 9 | |
177 | |
| 10 | // makes dynamically allocated objects zero-initialised |
178 | // makes dynamically allocated objects zero-initialised |
| 11 | struct zero_initialised |
179 | struct zero_initialised |
| 12 | { |
180 | { |
| 13 | void *operator new (size_t s, void *); |
181 | void *operator new (size_t s, void *p) |
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182 | { |
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183 | memset (p, 0, s); |
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184 | return p; |
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185 | } |
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186 | |
| 14 | void *operator new (size_t s); |
187 | void *operator new (size_t s) |
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188 | { |
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189 | return g_slice_alloc0 (s); |
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190 | } |
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191 | |
| 15 | void *operator new [] (size_t s); |
192 | void *operator new[] (size_t s) |
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193 | { |
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194 | return g_slice_alloc0 (s); |
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195 | } |
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196 | |
| 16 | void operator delete (void *p, size_t s); |
197 | void operator delete (void *p, size_t s) |
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198 | { |
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199 | g_slice_free1 (s, p); |
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200 | } |
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201 | |
| 17 | void operator delete [] (void *p, size_t s); |
202 | void operator delete[] (void *p, size_t s) |
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203 | { |
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204 | g_slice_free1 (s, p); |
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205 | } |
| 18 | }; |
206 | }; |
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207 | |
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208 | void *salloc_ (int n) throw (std::bad_alloc); |
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209 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
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210 | |
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211 | // strictly the same as g_slice_alloc, but never returns 0 |
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212 | template<typename T> |
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213 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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214 | |
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215 | // also copies src into the new area, like "memdup" |
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216 | // if src is 0, clears the memory |
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217 | template<typename T> |
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218 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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219 | |
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220 | // clears the memory |
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221 | template<typename T> |
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222 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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223 | |
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224 | // for symmetry |
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225 | template<typename T> |
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226 | inline void sfree (T *ptr, int n = 1) throw () |
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227 | { |
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228 | #ifdef PREFER_MALLOC |
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229 | free (ptr); |
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230 | #else |
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231 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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232 | #endif |
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233 | } |
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234 | |
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235 | // a STL-compatible allocator that uses g_slice |
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236 | // boy, this is verbose |
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237 | template<typename Tp> |
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238 | struct slice_allocator |
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239 | { |
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240 | typedef size_t size_type; |
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241 | typedef ptrdiff_t difference_type; |
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242 | typedef Tp *pointer; |
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243 | typedef const Tp *const_pointer; |
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244 | typedef Tp &reference; |
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245 | typedef const Tp &const_reference; |
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246 | typedef Tp value_type; |
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247 | |
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248 | template <class U> |
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249 | struct rebind |
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250 | { |
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251 | typedef slice_allocator<U> other; |
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252 | }; |
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253 | |
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254 | slice_allocator () throw () { } |
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255 | slice_allocator (const slice_allocator &o) throw () { } |
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256 | template<typename Tp2> |
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257 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
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258 | |
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259 | ~slice_allocator () { } |
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260 | |
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261 | pointer address (reference x) const { return &x; } |
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262 | const_pointer address (const_reference x) const { return &x; } |
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263 | |
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264 | pointer allocate (size_type n, const_pointer = 0) |
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265 | { |
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266 | return salloc<Tp> (n); |
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267 | } |
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268 | |
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269 | void deallocate (pointer p, size_type n) |
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270 | { |
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271 | sfree<Tp> (p, n); |
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272 | } |
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273 | |
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274 | size_type max_size ()const throw () |
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275 | { |
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276 | return size_t (-1) / sizeof (Tp); |
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277 | } |
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278 | |
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279 | void construct (pointer p, const Tp &val) |
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280 | { |
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281 | ::new (p) Tp (val); |
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282 | } |
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283 | |
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284 | void destroy (pointer p) |
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285 | { |
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286 | p->~Tp (); |
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287 | } |
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288 | }; |
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289 | |
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290 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
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291 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
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292 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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293 | struct tausworthe_random_generator |
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294 | { |
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295 | // generator |
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296 | uint32_t state [4]; |
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297 | |
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298 | void operator =(const tausworthe_random_generator &src) |
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299 | { |
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300 | state [0] = src.state [0]; |
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301 | state [1] = src.state [1]; |
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302 | state [2] = src.state [2]; |
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303 | state [3] = src.state [3]; |
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304 | } |
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305 | |
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306 | void seed (uint32_t seed); |
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307 | uint32_t next (); |
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308 | |
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309 | // uniform distribution |
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310 | uint32_t operator ()(uint32_t num) |
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311 | { |
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312 | return is_constant (num) |
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313 | ? (next () * (uint64_t)num) >> 32U |
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314 | : get_range (num); |
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315 | } |
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316 | |
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317 | // return a number within (min .. max) |
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318 | int operator () (int r_min, int r_max) |
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319 | { |
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320 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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321 | ? r_min + operator ()(r_max - r_min + 1) |
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322 | : get_range (r_min, r_max); |
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323 | } |
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324 | |
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325 | double operator ()() |
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326 | { |
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327 | return this->next () / (double)0xFFFFFFFFU; |
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328 | } |
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329 | |
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330 | protected: |
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331 | uint32_t get_range (uint32_t r_max); |
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332 | int get_range (int r_min, int r_max); |
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333 | }; |
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334 | |
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335 | typedef tausworthe_random_generator rand_gen; |
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336 | |
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337 | extern rand_gen rndm; |
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338 | |
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339 | template<class T> |
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340 | struct refptr |
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341 | { |
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342 | T *p; |
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343 | |
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344 | refptr () : p(0) { } |
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345 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
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346 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
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347 | ~refptr () { if (p) p->refcnt_dec (); } |
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348 | |
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349 | const refptr<T> &operator =(T *o) |
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350 | { |
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351 | if (p) p->refcnt_dec (); |
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352 | p = o; |
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353 | if (p) p->refcnt_inc (); |
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354 | |
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355 | return *this; |
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356 | } |
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357 | |
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358 | const refptr<T> &operator =(const refptr<T> o) |
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359 | { |
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360 | *this = o.p; |
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361 | return *this; |
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362 | } |
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363 | |
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364 | T &operator * () const { return *p; } |
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365 | T *operator ->() const { return p; } |
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366 | |
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367 | operator T *() const { return p; } |
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368 | }; |
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369 | |
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370 | typedef refptr<maptile> maptile_ptr; |
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371 | typedef refptr<object> object_ptr; |
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372 | typedef refptr<archetype> arch_ptr; |
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373 | typedef refptr<client> client_ptr; |
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374 | typedef refptr<player> player_ptr; |
| 19 | |
375 | |
| 20 | struct str_hash |
376 | struct str_hash |
| 21 | { |
377 | { |
| 22 | std::size_t operator ()(const char *s) const |
378 | std::size_t operator ()(const char *s) const |
| 23 | { |
379 | { |
| … | |
… | |
| 49 | { |
405 | { |
| 50 | return !strcmp (a, b); |
406 | return !strcmp (a, b); |
| 51 | } |
407 | } |
| 52 | }; |
408 | }; |
| 53 | |
409 | |
| 54 | #include <vector> |
410 | // Mostly the same as std::vector, but insert/erase can reorder |
| 55 | |
411 | // the elements, making insret/remove O(1) instead of O(n). |
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412 | // |
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413 | // NOTE: only some forms of erase/insert are available |
| 56 | template<class obj> |
414 | template<class T> |
| 57 | struct unordered_vector : std::vector<obj> |
415 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
| 58 | { |
416 | { |
| 59 | typedef typename std::vector<obj>::iterator iterator; |
417 | typedef typename unordered_vector::iterator iterator; |
| 60 | |
418 | |
| 61 | void erase (unsigned int pos) |
419 | void erase (unsigned int pos) |
| 62 | { |
420 | { |
| 63 | if (pos < this->size () - 1) |
421 | if (pos < this->size () - 1) |
| 64 | (*this)[pos] = (*this)[this->size () - 1]; |
422 | (*this)[pos] = (*this)[this->size () - 1]; |
| … | |
… | |
| 70 | { |
428 | { |
| 71 | erase ((unsigned int )(i - this->begin ())); |
429 | erase ((unsigned int )(i - this->begin ())); |
| 72 | } |
430 | } |
| 73 | }; |
431 | }; |
| 74 | |
432 | |
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433 | // This container blends advantages of linked lists |
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434 | // (efficiency) with vectors (random access) by |
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435 | // by using an unordered vector and storing the vector |
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436 | // index inside the object. |
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437 | // |
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438 | // + memory-efficient on most 64 bit archs |
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439 | // + O(1) insert/remove |
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440 | // + free unique (but varying) id for inserted objects |
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441 | // + cache-friendly iteration |
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442 | // - only works for pointers to structs |
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443 | // |
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444 | // NOTE: only some forms of erase/insert are available |
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445 | typedef int object_vector_index; |
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446 | |
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447 | template<class T, object_vector_index T::*indexmember> |
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448 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
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449 | { |
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450 | typedef typename object_vector::iterator iterator; |
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451 | |
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452 | bool contains (const T *obj) const |
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453 | { |
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454 | return obj->*indexmember; |
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455 | } |
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456 | |
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457 | iterator find (const T *obj) |
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458 | { |
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459 | return obj->*indexmember |
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460 | ? this->begin () + obj->*indexmember - 1 |
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461 | : this->end (); |
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462 | } |
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463 | |
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464 | void insert (T *obj) |
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465 | { |
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466 | push_back (obj); |
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467 | obj->*indexmember = this->size (); |
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468 | } |
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469 | |
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470 | void insert (T &obj) |
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471 | { |
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472 | insert (&obj); |
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473 | } |
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474 | |
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475 | void erase (T *obj) |
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476 | { |
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477 | unsigned int pos = obj->*indexmember; |
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478 | obj->*indexmember = 0; |
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479 | |
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480 | if (pos < this->size ()) |
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481 | { |
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482 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
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483 | (*this)[pos - 1]->*indexmember = pos; |
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484 | } |
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485 | |
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486 | this->pop_back (); |
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487 | } |
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488 | |
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489 | void erase (T &obj) |
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490 | { |
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491 | erase (&obj); |
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492 | } |
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493 | }; |
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494 | |
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495 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
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496 | void assign (char *dst, const char *src, int maxlen); |
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497 | |
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498 | // type-safe version of assign |
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499 | template<int N> |
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500 | inline void assign (char (&dst)[N], const char *src) |
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501 | { |
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502 | assign ((char *)&dst, src, N); |
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503 | } |
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504 | |
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505 | typedef double tstamp; |
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506 | |
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507 | // return current time as timestampe |
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508 | tstamp now (); |
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509 | |
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510 | int similar_direction (int a, int b); |
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511 | |
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512 | // like printf, but returns a std::string |
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513 | const std::string format (const char *format, ...); |
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514 | |
| 75 | #endif |
515 | #endif |
| 76 | |
516 | |
