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