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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 (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 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 it under |
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7 | * the terms of the Affero GNU General Public License as published by the |
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8 | * Free Software Foundation, either version 3 of the License, or (at your |
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9 | * 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 Affero GNU General Public License |
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17 | * and the GNU General Public License along with this program. If not, see |
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18 | * <http://www.gnu.org/licenses/>. |
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19 | * |
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20 | * The authors can be reached via e-mail to <support@deliantra.net> |
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21 | */ |
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22 | |
1 | #ifndef SHSTR_H__ |
23 | #ifndef SHSTR_H__ |
2 | #define SHSTR_H__ |
24 | #define SHSTR_H__ |
3 | |
25 | |
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26 | #include <cstring> |
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27 | #include <sstream> |
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28 | |
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29 | #include "traits.h" |
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30 | |
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31 | extern size_t shstr_alloc; |
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32 | |
4 | extern int buf_overflow(const char *buf1, const char *buf2, int bufsize); |
33 | extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); |
5 | |
34 | |
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35 | template<int size> |
6 | struct shstr |
36 | struct shstr_vec |
7 | { |
37 | { |
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38 | uint32_t hash; |
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39 | uint32_t len; |
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40 | uint32_t refcnt; |
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41 | // pointer points here |
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42 | char string [size]; |
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43 | }; |
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44 | |
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45 | // this class is a non-refcounted shared string |
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46 | // it cannot be used to create or store shared strings, but |
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47 | // it can be used to pass shared strings around, i.e. as function arguments |
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48 | // or return values. their lifetime must not span a gc () call, i.e. |
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49 | // they are only valid as temporary values within the same server tick. |
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50 | struct shstr_tmp |
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51 | { |
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52 | static shstr_vec<sizeof ("(null)")> nullvec; |
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53 | static const char *null () { return nullvec.string; } // this is the null pointer value |
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54 | |
8 | const char *s; |
55 | const char *s; |
9 | |
56 | |
10 | static int &refcnt (const char *s) |
57 | static unsigned int &hash (const char *s) |
11 | { |
58 | { |
12 | return *((int *)s - 1); |
59 | return *((unsigned int *)s - 3); |
13 | } |
60 | } |
14 | |
61 | |
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62 | int hash () const |
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63 | { |
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64 | return hash (s); |
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65 | } |
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66 | |
15 | static int &length (const char *s) |
67 | static unsigned int &length (const char *s) |
16 | { |
68 | { |
17 | return *((int *)s - 2); |
69 | return *((unsigned int *)s - 2); |
18 | } |
70 | } |
19 | |
71 | |
20 | int &refcnt () const |
72 | int length () const |
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73 | { |
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74 | return length (s); |
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75 | } |
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76 | |
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77 | // returns whether this shared string begins with the given prefix, |
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78 | // used mainly for searches when users give only the start of a name. |
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79 | bool starts_with (const char *prefix) const |
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80 | { |
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81 | int plen = strlen (prefix); |
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82 | |
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83 | return length () >= plen && !strncasecmp (s, prefix, plen); |
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84 | } |
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85 | |
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86 | // returns true if the substring is contained in the shstr |
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87 | // if the shstr is 0, then this always returns false. |
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88 | // the shstr is (theoretically) treated as a comma/colon/space etc. separated list. |
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89 | bool contains (const char *substring) const; |
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90 | |
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91 | //TODO: case sensitive should be eradicated |
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92 | bool eq_nc (const char *otherstring) const |
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93 | { |
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94 | return !strcasecmp (s, otherstring); |
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95 | } |
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96 | |
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97 | shstr_tmp () |
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98 | : s (null ()) |
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99 | { |
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100 | } |
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101 | |
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102 | shstr_tmp (const shstr_tmp &sh) |
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103 | : s (sh.s) |
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104 | { |
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105 | } |
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106 | |
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107 | shstr_tmp operator =(const shstr_tmp &sh) |
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108 | { |
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109 | s = sh.s; |
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110 | |
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111 | return *this; |
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112 | } |
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113 | |
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114 | // this is used for informational messages and the like |
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115 | const char *operator &() const { return s; } |
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116 | |
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117 | operator const char *() const { return s == null () ? 0 : s; } |
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118 | |
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119 | protected: |
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120 | // dummy is there so it isn't used as type converter accidentally |
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121 | shstr_tmp (int dummy, const char *s) |
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122 | : s(s) |
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123 | { |
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124 | } |
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125 | }; |
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126 | |
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127 | inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b) |
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128 | { |
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129 | return a.s == b.s; |
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130 | } |
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131 | |
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132 | inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b) |
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133 | { |
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134 | return a.s != b.s; |
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135 | } |
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136 | |
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137 | inline int strlen (shstr_tmp sh) |
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138 | { |
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139 | return sh.length (); |
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140 | } |
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141 | |
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142 | static inline std::ostream &operator <<(std::ostream &o, shstr_tmp sh) |
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143 | { |
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144 | o.write (sh.s, sh.length ()); |
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145 | |
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146 | return o; |
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147 | } |
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148 | |
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149 | struct shstr : shstr_tmp |
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150 | { |
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151 | static unsigned int &refcnt (const char *s) |
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152 | { |
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153 | return *((unsigned int *)s - 1); |
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154 | } |
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155 | |
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156 | unsigned int &refcnt () const |
21 | { |
157 | { |
22 | return refcnt (s); |
158 | return refcnt (s); |
23 | } |
159 | } |
24 | |
160 | |
25 | int length () const |
161 | shstr () |
26 | { |
162 | { |
27 | return s ? length (s) : 0; |
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28 | } |
163 | } |
29 | |
164 | |
30 | static const char *find (const char *s); |
165 | static const char *find (const char *s); |
31 | static const char *intern (const char *s); |
166 | static const char *intern (const char *s); |
32 | |
167 | |
33 | static void gc (); // garbage collect a few strings |
168 | static void gc (); // garbage collect a few strings |
34 | |
169 | |
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170 | shstr (const shstr &sh) |
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171 | : shstr_tmp (sh) |
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172 | { |
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173 | ++refcnt (); |
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174 | } |
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175 | |
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176 | shstr (const shstr_tmp &sh) |
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177 | : shstr_tmp (sh) |
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178 | { |
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179 | ++refcnt (); |
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180 | } |
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181 | |
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182 | explicit shstr (const char *str) |
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183 | : shstr_tmp (0, ecb_is_constant (str) && !str ? null () : intern (str)) |
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184 | { |
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185 | } |
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186 | |
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187 | ~shstr () |
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188 | { |
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189 | --refcnt (); |
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190 | } |
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191 | |
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192 | using shstr_tmp::operator &; |
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193 | using shstr_tmp::operator const char *; |
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194 | |
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195 | // (note: not the copy constructor) |
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196 | shstr &operator =(const shstr_tmp &sh) |
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197 | { |
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198 | --refcnt (); |
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199 | s = sh.s; |
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200 | ++refcnt (); |
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201 | |
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202 | return *this; |
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203 | } |
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204 | |
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205 | // here it comes |
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206 | shstr &operator =(const shstr &sh) |
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207 | { |
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208 | return (*this) = (shstr_tmp)sh; |
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209 | } |
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210 | |
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211 | // shstr_tmp doesn't have this one |
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212 | shstr &operator =(const char *str) |
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213 | { |
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214 | --refcnt (); |
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215 | s = ecb_is_constant (str) && !str ? null () : intern (str); |
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216 | |
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217 | return *this; |
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218 | } |
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219 | }; |
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220 | |
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221 | // only good for mass comparisons to shstr objects, or very |
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222 | // temporary passing, basically a non-refcounted shstr |
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223 | struct shstr_cmp |
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224 | { |
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225 | const char *s; |
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226 | |
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227 | // initialies to the non-matching string (as opposed to the null string) |
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228 | shstr_cmp () |
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229 | { |
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230 | s = 0; |
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231 | } |
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232 | |
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233 | shstr_cmp (const char *str) |
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234 | : s (shstr::find (str)) |
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235 | { |
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236 | } |
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237 | |
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238 | shstr_cmp (shstr_tmp sh) |
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239 | : s (sh.s) |
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240 | { |
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241 | } |
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242 | |
35 | // this is used for informational messages and the like |
243 | // this is used for informational messages and the like |
36 | const char *operator &() const { return s ? s : "<nil>"; } |
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37 | |
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38 | const char &operator [](int i) const { return s[i]; } |
244 | const char *operator &() const { return s; } |
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245 | |
39 | operator const char *() const { return s; } |
246 | operator const char *() const { return s; } |
40 | |
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41 | shstr () |
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42 | : s (0) |
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43 | { |
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44 | } |
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45 | |
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46 | shstr (const shstr &sh) |
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47 | : s (sh.s) |
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48 | { |
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49 | if (s) ++refcnt (); |
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50 | } |
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51 | |
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52 | explicit shstr (const char *s) |
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53 | : s (intern (s)) |
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54 | { |
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55 | } |
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56 | |
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57 | ~shstr () |
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58 | { |
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59 | if (s) --refcnt (); |
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60 | } |
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61 | |
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62 | const shstr &operator =(const shstr &sh) |
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63 | { |
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64 | if (s) --refcnt (); |
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65 | s = sh.s; |
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66 | if (s) ++refcnt (); |
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67 | |
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68 | return *this; |
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69 | } |
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70 | |
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71 | const shstr &operator =(const char *str) |
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72 | { |
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73 | if (s) --refcnt (); |
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74 | s = intern (str); |
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75 | |
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76 | return *this; |
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77 | } |
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78 | }; |
247 | }; |
79 | |
248 | |
80 | inline int strlen (const shstr &sh) |
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81 | { |
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82 | return sh.length (); |
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83 | } |
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84 | |
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85 | inline bool operator ==(const shstr &a, const shstr &b) |
249 | inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b) |
86 | { |
250 | { |
87 | return a.s == b.s; |
251 | return a.s == b.s; |
88 | } |
252 | } |
89 | |
253 | |
90 | inline bool operator !=(const shstr &a, const shstr &b) |
254 | inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b) |
91 | { |
255 | { |
92 | return !(a == b); |
256 | return a.s == b.s; |
93 | } |
257 | } |
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258 | |
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259 | #define def2(id,str) extern const shstr id; |
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260 | #define def(id) def2(shstr_ ## id, # id) |
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261 | # include "shstrinc.h" |
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262 | #undef def |
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263 | #undef def2 |
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264 | |
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265 | // undefined external reference to catch people using str* functions when they shouldn't |
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266 | //template<class any> void strcmp (const shstr_tmp &a, any b); |
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267 | template<class any> void strstr (const shstr_tmp &a, any b); |
94 | |
268 | |
95 | #endif |
269 | #endif |
96 | |
270 | |