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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 | |
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25 | #include <sstream> |
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26 | |
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27 | #include "util.h" |
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28 | |
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29 | extern size_t shstr_alloc; |
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30 | |
4 | extern int buf_overflow(const char *buf1, const char *buf2, int bufsize); |
31 | extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); |
5 | |
32 | |
6 | struct shstr |
33 | struct shstr |
7 | { |
34 | { |
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35 | static const char *null; |
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36 | |
8 | const char *s; |
37 | const char *s; |
9 | |
38 | |
10 | int &refcnt () |
39 | static int &refcnt (const char *s) |
11 | { |
40 | { |
12 | return *((int *)s - 1); |
41 | return *((int *)s - 1); |
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42 | } |
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43 | |
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44 | static int &length (const char *s) |
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45 | { |
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46 | return *((int *)s - 2); |
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47 | } |
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48 | |
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49 | int &refcnt () const |
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50 | { |
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51 | return refcnt (s); |
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52 | } |
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53 | |
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54 | int length () const |
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55 | { |
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56 | return length (s); |
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57 | } |
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58 | |
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59 | // returns wether this shared string begins with the given prefix, |
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60 | // used mainly for searched when users give only the start of a name. |
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61 | bool begins_with (const char *prefix) const |
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62 | { |
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63 | int plen = strlen (prefix); |
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64 | return !strncasecmp (s, prefix, plen) && length () >= plen; |
13 | } |
65 | } |
14 | |
66 | |
15 | static const char *find (const char *s); |
67 | static const char *find (const char *s); |
16 | static const char *intern (const char *s); |
68 | static const char *intern (const char *s); |
17 | |
69 | |
18 | static void gc (); // garbage collect a few strings |
70 | static void gc (); // garbage collect a few strings |
19 | |
71 | |
20 | // this is used for informational messages and the like I/O |
72 | // this is used for informational messages and the like |
21 | const char *operator &() const { return s ? s : "<nil>"; } |
73 | const char *operator &() const { return s; } |
22 | |
74 | |
23 | const char &operator [](int i) { return s[i]; } |
75 | const char &operator [](int i) const { return s[i]; } |
24 | operator const char *() const { return s; } |
76 | operator const char *() const { return s == null ? 0 : s; } |
25 | |
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26 | int length () const |
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27 | { |
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28 | return s ? *((int *)s - 2) : 0; |
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29 | } |
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30 | |
77 | |
31 | shstr () |
78 | shstr () |
32 | : s (0) |
79 | : s (null) |
33 | { |
80 | { |
34 | } |
81 | } |
35 | |
82 | |
36 | shstr (shstr &sh) |
83 | shstr (const shstr &sh) |
37 | : s (sh.s) |
84 | : s (sh.s) |
38 | { |
85 | { |
39 | if (s) ++refcnt (); |
86 | ++refcnt (); |
40 | } |
87 | } |
41 | |
88 | |
42 | explicit shstr (const char *s) |
89 | explicit shstr (const char *s) |
43 | : s (intern (s)) |
90 | : s (intern (s)) |
44 | { |
91 | { |
45 | if (s) ++refcnt (); |
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46 | } |
92 | } |
47 | |
93 | |
48 | ~shstr () |
94 | ~shstr () |
49 | { |
95 | { |
50 | if (s) --refcnt (); |
96 | --refcnt (); |
51 | } |
97 | } |
52 | |
98 | |
53 | const shstr &operator =(const shstr &sh) |
99 | const shstr &operator =(const shstr &sh) |
54 | { |
100 | { |
55 | if (s) --refcnt (); |
101 | --refcnt (); |
56 | s = sh.s; |
102 | s = sh.s; |
57 | if (s) ++refcnt (); |
103 | ++refcnt (); |
58 | |
104 | |
59 | return *this; |
105 | return *this; |
60 | } |
106 | } |
61 | |
107 | |
62 | const shstr &operator =(const char *str) |
108 | const shstr &operator =(const char *str) |
63 | { |
109 | { |
64 | if (s) --refcnt (); |
110 | --refcnt (); |
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111 | |
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112 | // this optimises the important case of str == constant 0 |
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113 | if (is_constant (str)) |
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114 | s = str ? intern (str) : null; |
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115 | else |
65 | s = intern (str); |
116 | s = intern (str); |
66 | |
117 | |
67 | return *this; |
118 | return *this; |
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119 | } |
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120 | |
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121 | bool operator ==(const shstr &b) |
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122 | { |
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123 | return s == b.s; |
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124 | } |
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125 | |
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126 | bool operator !=(const shstr &b) |
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127 | { |
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128 | return !(*this == b); |
68 | } |
129 | } |
69 | }; |
130 | }; |
70 | |
131 | |
71 | inline int strlen (const shstr &sh) |
132 | inline int strlen (const shstr &sh) |
72 | { |
133 | { |
73 | return sh.length (); |
134 | return sh.length (); |
74 | } |
135 | } |
75 | |
136 | |
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137 | inline int strcmp (const shstr &a, const shstr &b) |
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138 | { |
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139 | // TODO: use this to find all the occurences of people using strcmp |
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140 | // all uses should be bogus, as we should be never interested in |
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141 | // comparing shstr's alphabetically |
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142 | #if 0 |
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143 | extern void do_not_use_strcmp_to_compare_shstr_values (); |
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144 | do_not_use_strcmp_to_compare_shstr_values (); |
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145 | #endif |
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146 | return a != b; |
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147 | } |
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148 | |
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149 | static std::ostream &operator <<(std::ostream &o, const shstr &sh) |
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150 | { |
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151 | o.write (sh.s, sh.length ()); |
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152 | return o; |
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153 | } |
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154 | |
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155 | // only good for mass comparisons to shstr objects |
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156 | struct shstr_cmp |
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157 | { |
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158 | const char *s; |
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159 | |
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160 | explicit shstr_cmp (const char *s) |
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161 | : s (shstr::find (s)) |
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162 | { |
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163 | } |
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164 | |
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165 | shstr_cmp (const shstr_cmp &sh) |
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166 | : s (sh.s) |
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167 | { |
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168 | } |
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169 | |
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170 | shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } |
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171 | operator const char *() const { return s; } |
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172 | }; |
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173 | |
76 | inline bool operator ==(const shstr &a, const shstr &b) |
174 | inline bool operator ==(const shstr_cmp &a, const shstr &b) |
77 | { |
175 | { |
78 | return a.s == b.s; |
176 | return a.s == b.s; |
79 | } |
177 | } |
80 | |
178 | |
81 | inline bool operator !=(const shstr &a, const shstr &b) |
179 | inline bool operator ==(const shstr &a, const shstr_cmp &b) |
82 | { |
180 | { |
83 | return !(a == b); |
181 | return b == a; |
84 | } |
182 | } |
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183 | |
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184 | extern const shstr shstr_null; |
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185 | |
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186 | #define def(str) extern const shstr shstr_ ## str; |
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187 | # include "shstrinc.h" |
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188 | #undef def |
85 | |
189 | |
86 | #endif |
190 | #endif |
87 | |
191 | |