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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * |
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6 | * Deliantra is free software: you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License as published by |
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8 | * the Free Software Foundation, either version 3 of the License, or |
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9 | * (at your option) any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU General Public License |
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17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | * |
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19 | * The authors can be reached via e-mail to <support@deliantra.net> |
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20 | */ |
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21 | |
1 | #ifndef SHSTR_H__ |
22 | #ifndef SHSTR_H__ |
2 | #define SHSTR_H__ |
23 | #define SHSTR_H__ |
3 | |
24 | |
4 | //// OLD STUFF |
25 | #include <cstring> |
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26 | #include <sstream> |
5 | |
27 | |
6 | /* The size of the shared strings hashtable. This must be smaller than |
28 | #include "traits.h" |
7 | * 32767, but 947 ought to be plenty enough. |
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8 | */ |
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9 | #define TABLESIZE 4133 |
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10 | |
29 | |
11 | /* This specifies how many characters the hashing routine should look at. |
30 | extern size_t shstr_alloc; |
12 | * You may actually save CPU by increasing this number if the typical string |
31 | |
13 | * is large. |
32 | extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); |
14 | */ |
33 | |
15 | #ifndef MAXSTRING |
34 | template<int size> |
16 | #define MAXSTRING 20 |
35 | struct shstr_vec |
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36 | { |
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37 | uint32_t len; |
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38 | uint32_t refcnt; |
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39 | char string[size]; |
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40 | }; |
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41 | |
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42 | // this class is a non-refcounted shared string |
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43 | // it cannot be used to create or store shared strings, but |
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44 | // it can be used to apss shared strings around, i.e. as function arguments |
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45 | // or return values. their lifetime must not span a gc () call, i.e. |
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46 | // they are only valid as temporary values within the same server tick. |
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47 | struct shstr_tmp |
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48 | { |
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49 | static shstr_vec<sizeof ("(null)")> nullvec; |
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50 | static const char *null () { return nullvec.string; } // this is the null pointer value |
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51 | |
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52 | const char *s; |
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53 | |
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54 | static unsigned int &length (const char *s) |
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55 | { |
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56 | return *((unsigned int *)s - 2); |
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57 | } |
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58 | |
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59 | int length () const |
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60 | { |
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61 | return length (s); |
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62 | } |
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63 | |
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64 | // returns whether this shared string begins with the given prefix, |
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65 | // used mainly for searches when users give only the start of a name. |
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66 | bool starts_with (const char *prefix) const |
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67 | { |
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68 | int plen = strlen (prefix); |
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69 | |
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70 | return length () >= plen && !strncasecmp (s, prefix, plen); |
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71 | } |
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72 | |
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73 | bool contains (const char *substring) const |
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74 | { |
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75 | return s != null () && strstr (s, substring); |
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76 | } |
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77 | |
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78 | //TODO: case sensitive should be eradicated |
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79 | bool eq_nc (const char *otherstring) const |
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80 | { |
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81 | return !strcasecmp (s, otherstring); |
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82 | } |
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83 | |
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84 | shstr_tmp () |
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85 | : s (null ()) |
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86 | { |
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87 | } |
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88 | |
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89 | shstr_tmp (const shstr_tmp &sh) |
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90 | : s (sh.s) |
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91 | { |
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92 | } |
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93 | |
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94 | shstr_tmp operator =(const shstr_tmp &sh) |
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95 | { |
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96 | s = sh.s; |
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97 | |
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98 | return *this; |
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99 | } |
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100 | |
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101 | // this is used for informational messages and the like |
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102 | const char *operator &() const { return s; } |
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103 | |
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104 | operator const char *() const { return s == null () ? 0 : s; } |
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105 | |
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106 | protected: |
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107 | // dummy is there so it isn't used as type converter accidentally |
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108 | shstr_tmp (int dummy, const char *s) |
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109 | : s(s) |
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110 | { |
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111 | } |
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112 | }; |
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113 | |
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114 | inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b) |
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115 | { |
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116 | return a.s == b.s; |
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117 | } |
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118 | |
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119 | inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b) |
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120 | { |
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121 | return a.s != b.s; |
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122 | } |
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123 | |
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124 | inline int strlen (shstr_tmp sh) |
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125 | { |
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126 | return sh.length (); |
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127 | } |
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128 | |
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129 | static std::ostream &operator <<(std::ostream &o, shstr_tmp sh) |
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130 | { |
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131 | o.write (sh.s, sh.length ()); |
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132 | |
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133 | return o; |
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134 | } |
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135 | |
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136 | struct shstr : shstr_tmp |
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137 | { |
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138 | static unsigned int &refcnt (const char *s) |
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139 | { |
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140 | return *((unsigned int *)s - 1); |
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141 | } |
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142 | |
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143 | unsigned int &refcnt () const |
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144 | { |
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145 | return refcnt (s); |
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146 | } |
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147 | |
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148 | shstr () |
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149 | { |
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150 | } |
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151 | |
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152 | static const char *find (const char *s); |
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153 | static const char *intern (const char *s); |
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154 | |
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155 | static void gc (); // garbage collect a few strings |
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156 | |
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157 | shstr (const shstr &sh) |
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158 | : shstr_tmp (sh) |
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159 | { |
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160 | ++refcnt (); |
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161 | } |
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162 | |
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163 | shstr (const shstr_tmp &sh) |
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164 | : shstr_tmp (sh) |
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165 | { |
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166 | ++refcnt (); |
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167 | } |
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168 | |
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169 | explicit shstr (const char *str) |
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170 | : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str)) |
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171 | { |
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172 | } |
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173 | |
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174 | ~shstr () |
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175 | { |
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176 | --refcnt (); |
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177 | } |
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178 | |
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179 | using shstr_tmp::operator &; |
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180 | using shstr_tmp::operator const char *; |
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181 | |
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182 | // (note: not the copy constructor) |
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183 | shstr &operator =(const shstr_tmp &sh) |
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184 | { |
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185 | --refcnt (); |
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186 | s = sh.s; |
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187 | ++refcnt (); |
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188 | |
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189 | return *this; |
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190 | } |
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191 | |
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192 | // here it comes |
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193 | shstr &operator =(const shstr &sh) |
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194 | { |
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195 | return (*this) = (shstr_tmp)sh; |
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196 | } |
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197 | |
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198 | // shstr_tmp doesn't have this one |
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199 | shstr &operator =(const char *str) |
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200 | { |
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201 | --refcnt (); |
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202 | s = is_constant (str) && !str ? null () : intern (str); |
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203 | |
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204 | return *this; |
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205 | } |
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206 | }; |
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207 | |
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208 | // only good for mass comparisons to shstr objects, or very |
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209 | // temporary passing, basically a non-refcounted shstr |
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210 | struct shstr_cmp |
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211 | { |
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212 | const char *s; |
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213 | |
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214 | // initialies to the non-matching string (as opposed to the null string) |
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215 | shstr_cmp () |
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216 | { |
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217 | s = 0; |
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218 | } |
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219 | |
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220 | shstr_cmp (const char *str) |
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221 | : s (shstr::find (str)) |
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222 | { |
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223 | } |
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224 | |
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225 | shstr_cmp (shstr_tmp sh) |
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226 | : s (sh.s) |
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227 | { |
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228 | } |
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229 | |
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230 | // this is used for informational messages and the like |
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231 | const char *operator &() const { return s; } |
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232 | |
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233 | operator const char *() const { return s; } |
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234 | }; |
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235 | |
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236 | inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b) |
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237 | { |
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238 | return a.s == b.s; |
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239 | } |
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240 | |
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241 | inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b) |
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242 | { |
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243 | return a.s == b.s; |
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244 | } |
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245 | |
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246 | #define def2(id,str) extern const shstr id; |
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247 | #define def(id) def2(shstr_ ## id, # id) |
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248 | # include "shstrinc.h" |
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249 | #undef def |
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250 | #undef def2 |
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251 | |
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252 | // undefined external reference to catch people using str* functions when they shouldn't |
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253 | //template<class any> void strcmp (const shstr_tmp &a, any b); |
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254 | template<class any> void strstr (const shstr_tmp &a, any b); |
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255 | |
17 | #endif |
256 | #endif |
18 | |
257 | |
19 | /* In the unlikely occurence that 16383 references to a string are too |
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20 | * few, you can modify the below type to something bigger. |
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21 | * (The top bit of "refcount" is used to signify that "u.array" points |
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22 | * at the array entry.) |
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23 | */ |
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24 | #define REFCOUNT_TYPE int |
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25 | |
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26 | /* The offsetof macro is part of ANSI C, but many compilers lack it, for |
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27 | * example "gcc -ansi" |
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28 | */ |
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29 | #if !defined (offsetof) |
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30 | #define offsetof(type, member) (int)&(((type *)0)->member) |
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31 | #endif |
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32 | |
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33 | /* SS(string) will return the address of the shared_string struct which |
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34 | * contains "string". |
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35 | */ |
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36 | #define SS(x) ((shared_string *) ((x) - offsetof(shared_string, string))) |
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37 | |
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38 | #define SS_STATISTICS |
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39 | |
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40 | #define SS_DUMP_TABLE 1 |
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41 | #define SS_DUMP_TOTALS 2 |
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42 | |
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43 | #ifdef SS_STATISTICS |
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44 | static struct statistics { |
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45 | int calls; |
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46 | int hashed; |
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47 | int strcmps; |
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48 | int search; |
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49 | int linked; |
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50 | } add_stats, add_ref_stats, free_stats, find_stats, hash_stats; |
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51 | #define GATHER(n) (++n) |
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52 | #else /* !SS_STATISTICS */ |
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53 | #define GATHER(n) |
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54 | #endif /* SS_STATISTICS */ |
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55 | |
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56 | #define TOPBIT ((unsigned REFCOUNT_TYPE) 1 << (sizeof(REFCOUNT_TYPE) * CHAR_BIT - 1)) |
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57 | |
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58 | #define PADDING ((2 * sizeof(long) - sizeof(REFCOUNT_TYPE)) % sizeof(long)) + 1 |
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59 | |
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60 | typedef struct _shared_string { |
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61 | union { |
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62 | struct _shared_string **array; |
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63 | struct _shared_string *previous; |
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64 | } u; |
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65 | struct _shared_string *next; |
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66 | /* The top bit of "refcount" is used to signify that "u.array" points |
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67 | * at the array entry. |
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68 | */ |
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69 | unsigned REFCOUNT_TYPE refcount; |
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70 | /* Padding will be unused memory, since we can't know how large |
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71 | * the padding when allocating memory. We assume here that |
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72 | * sizeof(long) is a good boundary. |
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73 | */ |
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74 | char string[PADDING]; |
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75 | } shared_string; |
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76 | |
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77 | extern void init_hash_table(void); |
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78 | extern const char *add_string(const char *str); |
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79 | extern const char *add_refcount(const char *str); |
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80 | extern int query_refcount(const char *str); |
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81 | extern const char *find_string(const char *str); |
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82 | extern void free_string(const char *str); |
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83 | extern void ss_dump_statistics(void); |
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84 | extern const char *ss_dump_table(int what); |
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85 | extern int buf_overflow(const char *buf1, const char *buf2, int bufsize); |
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86 | |
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87 | //// NEW STUFF |
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88 | |
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89 | #if 0 |
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90 | struct shstr |
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91 | { |
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92 | const char *s; |
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93 | operator const char *() const { return s; }; |
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94 | shstr &operator =(const char *str) { s = str; }; |
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95 | }; |
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96 | #else |
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97 | typedef const char *shstr; |
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98 | #endif |
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99 | |
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100 | #endif |
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101 | |
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