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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 (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team |
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5 | * 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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6 | * |
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7 | * Deliantra is free software: you can redistribute it and/or modify it under |
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8 | * the terms of the Affero GNU General Public License as published by the |
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9 | * Free Software Foundation, either version 3 of the License, or (at your |
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10 | * option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the Affero GNU General Public License |
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18 | * and the GNU General Public License along with this program. If not, see |
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19 | * <http://www.gnu.org/licenses/>. |
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20 | * |
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21 | * The authors can be reached via e-mail to <support@deliantra.net> |
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22 | */ |
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23 | |
1 | #ifndef SHSTR_H__ |
24 | #ifndef SHSTR_H__ |
2 | #define SHSTR_H__ |
25 | #define SHSTR_H__ |
3 | |
26 | |
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27 | #include <cstring> |
4 | #include <sstream> |
28 | #include <sstream> |
5 | |
29 | |
6 | #include "util.h" |
30 | #include "traits.h" |
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31 | |
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32 | extern size_t shstr_alloc; |
7 | |
33 | |
8 | extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); |
34 | extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); |
9 | |
35 | |
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36 | template<int size> |
10 | struct shstr |
37 | struct shstr_vec |
11 | { |
38 | { |
12 | static const char *null; |
39 | uint32_t hash; |
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40 | uint32_t len; |
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41 | uint32_t refcnt; |
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42 | // pointer points here |
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43 | char string [size]; |
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44 | }; |
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45 | |
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46 | // this class is a non-refcounted shared string |
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47 | // it cannot be used to create or store shared strings, but |
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48 | // it can be used to pass shared strings around, i.e. as function arguments |
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49 | // or return values. their lifetime must not span a gc () call, i.e. |
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50 | // they are only valid as temporary values within the same server tick. |
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51 | struct shstr_tmp |
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52 | { |
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53 | static shstr_vec<sizeof ("(null)")> nullvec; |
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54 | static const char *null () { return nullvec.string; } // this is the null pointer value |
13 | |
55 | |
14 | const char *s; |
56 | const char *s; |
15 | |
57 | |
16 | static int &refcnt (const char *s) |
58 | static unsigned int &hash (const char *s) |
17 | { |
59 | { |
18 | return *((int *)s - 1); |
60 | return *((unsigned int *)s - 3); |
19 | } |
61 | } |
20 | |
62 | |
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63 | int hash () const |
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64 | { |
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65 | return hash (s); |
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66 | } |
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67 | |
21 | static int &length (const char *s) |
68 | static unsigned int &length (const char *s) |
22 | { |
69 | { |
23 | return *((int *)s - 2); |
70 | return *((unsigned int *)s - 2); |
24 | } |
71 | } |
25 | |
72 | |
26 | int &refcnt () const |
73 | int length () const |
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74 | { |
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75 | return length (s); |
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76 | } |
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77 | |
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78 | // returns whether this shared string begins with the given prefix, |
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79 | // used mainly for searches when users give only the start of a name. |
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80 | bool starts_with (const char *prefix) const |
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81 | { |
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82 | int plen = strlen (prefix); |
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83 | |
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84 | return length () >= plen && !strncasecmp (s, prefix, plen); |
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85 | } |
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86 | |
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87 | // returns true if the substring is contained in the shstr |
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88 | // if the shstr is 0, then this always returns false. |
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89 | // the shstr is (theoretically) treated as a comma/colon/space etc. separated list. |
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90 | bool contains (const char *substring) const; |
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91 | |
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92 | //TODO: case sensitive should be eradicated |
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93 | bool eq_nc (const char *otherstring) const |
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94 | { |
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95 | return !strcasecmp (s, otherstring); |
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96 | } |
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97 | |
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98 | shstr_tmp () |
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99 | : s (null ()) |
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100 | { |
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101 | } |
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102 | |
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103 | shstr_tmp (const shstr_tmp &sh) |
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104 | : s (sh.s) |
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105 | { |
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106 | } |
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107 | |
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108 | shstr_tmp operator =(const shstr_tmp &sh) |
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109 | { |
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110 | s = sh.s; |
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111 | |
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112 | return *this; |
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113 | } |
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114 | |
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115 | // this is used for informational messages and the like |
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116 | const char *operator &() const { return s; } |
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117 | |
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118 | operator const char *() const { return s == null () ? 0 : s; } |
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119 | |
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120 | protected: |
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121 | // dummy is there so it isn't used as type converter accidentally |
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122 | shstr_tmp (int dummy, const char *s) |
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123 | : s(s) |
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124 | { |
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125 | } |
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126 | }; |
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127 | |
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128 | inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b) |
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129 | { |
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130 | return a.s == b.s; |
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131 | } |
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132 | |
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133 | inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b) |
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134 | { |
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135 | return a.s != b.s; |
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136 | } |
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137 | |
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138 | inline int strlen (shstr_tmp sh) |
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139 | { |
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140 | return sh.length (); |
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141 | } |
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142 | |
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143 | static inline std::ostream &operator <<(std::ostream &o, shstr_tmp sh) |
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144 | { |
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145 | o.write (sh.s, sh.length ()); |
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146 | |
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147 | return o; |
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148 | } |
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149 | |
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150 | struct shstr : shstr_tmp |
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151 | { |
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152 | static unsigned int &refcnt (const char *s) |
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153 | { |
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154 | return *((unsigned int *)s - 1); |
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155 | } |
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156 | |
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157 | unsigned int &refcnt () const |
27 | { |
158 | { |
28 | return refcnt (s); |
159 | return refcnt (s); |
29 | } |
160 | } |
30 | |
161 | |
31 | int length () const |
162 | shstr () |
32 | { |
163 | { |
33 | return length (s); |
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34 | } |
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35 | |
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36 | // returns wether this shared string begins with the given prefix, |
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37 | // used mainly for searched when users give only the start of a name. |
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38 | bool begins_with (const char *prefix) const |
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39 | { |
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40 | int plen = strlen (prefix); |
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41 | return !strncasecmp (s, prefix, plen) && length () >= plen; |
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42 | } |
164 | } |
43 | |
165 | |
44 | static const char *find (const char *s); |
166 | static const char *find (const char *s); |
45 | static const char *intern (const char *s); |
167 | static const char *intern (const char *s); |
46 | |
168 | |
47 | static void gc (); // garbage collect a few strings |
169 | static void gc (); // garbage collect a few strings |
48 | |
170 | |
49 | // this is used for informational messages and the like |
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50 | const char *operator &() const { return s; } |
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51 | |
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52 | const char &operator [](int i) const { return s[i]; } |
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53 | operator const char *() const { return s == null ? 0 : s; } |
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54 | |
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55 | shstr () |
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56 | : s (null) |
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57 | { |
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58 | } |
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59 | |
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60 | shstr (const shstr &sh) |
171 | shstr (const shstr &sh) |
61 | : s (sh.s) |
172 | : shstr_tmp (sh) |
62 | { |
173 | { |
63 | ++refcnt (); |
174 | ++refcnt (); |
64 | } |
175 | } |
65 | |
176 | |
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177 | shstr (const shstr_tmp &sh) |
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178 | : shstr_tmp (sh) |
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179 | { |
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180 | ++refcnt (); |
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181 | } |
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182 | |
66 | explicit shstr (const char *s) |
183 | explicit shstr (const char *str) |
67 | : s (intern (s)) |
184 | : shstr_tmp (0, ecb_is_constant (str) && !str ? null () : intern (str)) |
68 | { |
185 | { |
69 | } |
186 | } |
70 | |
187 | |
71 | ~shstr () |
188 | ~shstr () |
72 | { |
189 | { |
73 | --refcnt (); |
190 | --refcnt (); |
74 | } |
191 | } |
75 | |
192 | |
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193 | using shstr_tmp::operator &; |
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194 | using shstr_tmp::operator const char *; |
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195 | |
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196 | // (note: not the copy constructor) |
76 | const shstr &operator =(const shstr &sh) |
197 | shstr &operator =(const shstr_tmp &sh) |
77 | { |
198 | { |
78 | --refcnt (); |
199 | --refcnt (); |
79 | s = sh.s; |
200 | s = sh.s; |
80 | ++refcnt (); |
201 | ++refcnt (); |
81 | |
202 | |
82 | return *this; |
203 | return *this; |
83 | } |
204 | } |
84 | |
205 | |
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206 | // here it comes |
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207 | shstr &operator =(const shstr &sh) |
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208 | { |
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209 | return (*this) = (shstr_tmp)sh; |
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210 | } |
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211 | |
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212 | // shstr_tmp doesn't have this one |
85 | const shstr &operator =(const char *str) |
213 | shstr &operator =(const char *str) |
86 | { |
214 | { |
87 | --refcnt (); |
215 | --refcnt (); |
88 | |
216 | s = ecb_is_constant (str) && !str ? null () : intern (str); |
89 | // this optimises the important case of str == constant 0 |
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90 | if (is_constant (str)) |
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91 | s = str ? intern (str) : null; |
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92 | else |
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93 | s = intern (str); |
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94 | |
217 | |
95 | return *this; |
218 | return *this; |
96 | } |
219 | } |
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220 | }; |
97 | |
221 | |
98 | bool operator ==(const shstr &b) |
222 | // only good for mass comparisons to shstr objects, or very |
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223 | // temporary passing, basically a non-refcounted shstr |
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224 | struct shstr_cmp |
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225 | { |
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226 | const char *s; |
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227 | |
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228 | // initialies to the non-matching string (as opposed to the null string) |
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229 | shstr_cmp () |
99 | { |
230 | { |
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231 | s = 0; |
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232 | } |
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233 | |
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234 | shstr_cmp (const char *str) |
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235 | : s (shstr::find (str)) |
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236 | { |
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237 | } |
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238 | |
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239 | shstr_cmp (shstr_tmp sh) |
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240 | : s (sh.s) |
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241 | { |
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242 | } |
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243 | |
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244 | // this is used for informational messages and the like |
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245 | const char *operator &() const { return s; } |
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246 | |
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247 | operator const char *() const { return s; } |
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248 | }; |
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249 | |
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250 | inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b) |
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251 | { |
100 | return s == b.s; |
252 | return a.s == b.s; |
101 | } |
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102 | |
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103 | bool operator !=(const shstr &b) |
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104 | { |
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105 | return !(*this == b); |
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106 | } |
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107 | }; |
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108 | |
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109 | inline int strlen (const shstr &sh) |
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110 | { |
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111 | return sh.length (); |
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112 | } |
253 | } |
113 | |
254 | |
114 | inline int strcmp (const shstr &a, const shstr &b) |
255 | inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b) |
115 | { |
256 | { |
116 | // TODO: use this to find all the occurences of people using strcmp |
257 | return a.s == b.s; |
117 | // all uses should be bogus, as we should be never interested in |
258 | } |
118 | // comparing shstr's alphabetically |
259 | |
119 | #if 0 |
260 | #define def2(id,str) extern const shstr id; |
120 | extern void do_not_use_strcmp_to_compare_shstr_values (); |
261 | #define def(id) def2(shstr_ ## id, # id) |
121 | do_not_use_strcmp_to_compare_shstr_values (); |
262 | # include "shstrinc.h" |
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263 | #undef def |
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264 | #undef def2 |
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265 | |
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266 | // undefined external reference to catch people using str* functions when they shouldn't |
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267 | //template<class any> void strcmp (const shstr_tmp &a, any b); |
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268 | template<class any> void strstr (const shstr_tmp &a, any b); |
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269 | |
122 | #endif |
270 | #endif |
123 | return a != b; |
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124 | } |
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125 | |
271 | |
126 | static std::ostream &operator <<(std::ostream &o, const shstr &sh) |
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127 | { |
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128 | o.write (sh.s, sh.length ()); |
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129 | return o; |
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130 | } |
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131 | |
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132 | // only good for mass comparisons to shstr objects |
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133 | struct shstr_cmp |
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134 | { |
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135 | const char *s; |
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136 | |
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137 | explicit shstr_cmp (const char *s) |
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138 | : s (shstr::find (s)) |
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139 | { |
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140 | } |
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141 | |
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142 | shstr_cmp (const shstr_cmp &sh) |
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143 | : s (sh.s) |
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144 | { |
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145 | } |
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146 | |
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147 | shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } |
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148 | operator const char *() const { return s; } |
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149 | }; |
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150 | |
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151 | inline bool operator ==(const shstr_cmp &a, const shstr &b) |
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152 | { |
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153 | return a.s == b.s; |
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154 | } |
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155 | |
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156 | inline bool operator ==(const shstr &a, const shstr_cmp &b) |
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157 | { |
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158 | return b == a; |
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159 | } |
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160 | |
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161 | extern const shstr undead_name; /* Used in hit_player() in main.c */ |
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162 | |
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163 | #endif |
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164 | |
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