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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.17 by root, Sun Jul 1 05:00:18 2007 UTC vs.
Revision 1.24 by root, Wed Dec 31 17:35:37 2008 UTC

1/* 1/*
2 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team 4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 5 *
6 * Crossfire TRT is free software: you can redistribute it and/or modify 6 * Deliantra is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by 7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or 8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version. 9 * (at your option) any later version.
10 * 10 *
11 * This program is distributed in the hope that it will be useful, 11 * This program is distributed in the hope that it will be useful,
… …
14 * GNU General Public License for more details. 14 * GNU General Public License for more details.
15 * 15 *
16 * You should have received a copy of the GNU General Public License 16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 * 18 *
19 * The authors can be reached via e-mail to <crossfire@schmorp.de> 19 * The authors can be reached via e-mail to <support@deliantra.net>
20 */ 20 */
21 21
22#ifndef SHSTR_H__ 22#ifndef SHSTR_H__
23#define SHSTR_H__ 23#define SHSTR_H__
24 24
25#include <cstring>
25#include <sstream> 26#include <sstream>
26 27
27#include "util.h" 28#include "util.h"
28 29
30extern size_t shstr_alloc;
31
29extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
30 33
34// this class is a non-refcounted shared string
35// it cannot be used to create or store shared strings, but
36// it can be used to apss shared strings around, i.e. as function arguments
37// or return values. their lifetime must not span a gc () call, i.e.
38// they are only valid as temporary values within the same server tick.
31struct shstr 39struct shstr_tmp
32{ 40{
33 static const char *null; 41 static const char *null;
34 42
35 const char *s; 43 const char *s;
36 44
37 static int &refcnt (const char *s)
38 {
39 return *((int *)s - 1);
40 }
41
42 static int &length (const char *s) 45 static unsigned int &length (const char *s)
43 { 46 {
44 return *((int *)s - 2); 47 return *((unsigned int *)s - 2);
45 } 48 }
46 49
47 int &refcnt () const 50 int length () const
51 {
52 return length (s);
53 }
54
55 // returns whether this shared string begins with the given prefix,
56 // used mainly for searches when users give only the start of a name.
57 bool starts_with (const char *prefix) const
58 {
59 int plen = strlen (prefix);
60
61 return length () >= plen && !strncasecmp (s, prefix, plen);
62 }
63
64 bool contains (const char *substring) const
65 {
66 return strstr (s, substring);
67 }
68
69 shstr_tmp ()
70 : s (null)
71 {
72 }
73
74 shstr_tmp (const shstr_tmp &sh)
75 : s (sh.s)
76 {
77 }
78
79 shstr_tmp operator =(const shstr_tmp &sh)
80 {
81 s = sh.s;
82
83 return *this;
84 }
85
86 // this is used for informational messages and the like
87 const char *operator &() const { return s; }
88
89 operator const char *() const { return s == null ? 0 : s; }
90};
91
92inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
93{
94 return a.s == b.s;
95}
96
97inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
98{
99 return a.s != b.s;
100}
101
102inline int strlen (const shstr_tmp &sh)
103{
104 return sh.length ();
105}
106
107// undefined external reference to catch people using strcmp when they shouldn't
108int strcmp (const shstr_tmp &a, const shstr_tmp &b);
109
110static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
111{
112 o.write (sh.s, sh.length ());
113
114 return o;
115}
116
117struct shstr : shstr_tmp
118{
119 static unsigned int &refcnt (const char *s)
120 {
121 return *((unsigned int *)s - 1);
122 }
123
124 unsigned int &refcnt () const
48 { 125 {
49 return refcnt (s); 126 return refcnt (s);
50 } 127 }
51 128
52 int length () const 129 shstr ()
53 { 130 {
54 return length (s);
55 }
56
57 // returns wether this shared string begins with the given prefix,
58 // used mainly for searched when users give only the start of a name.
59 bool begins_with (const char *prefix) const
60 {
61 int plen = strlen (prefix);
62 return !strncasecmp (s, prefix, plen) && length () >= plen;
63 } 131 }
64 132
65 static const char *find (const char *s); 133 static const char *find (const char *s);
66 static const char *intern (const char *s); 134 static const char *intern (const char *s);
67 135
68 static void gc (); // garbage collect a few strings 136 static void gc (); // garbage collect a few strings
69 137
70 // this is used for informational messages and the like
71 const char *operator &() const { return s; }
72
73 const char &operator [](int i) const { return s[i]; }
74 operator const char *() const { return s == null ? 0 : s; }
75
76 shstr ()
77 : s (null)
78 {
79 }
80
81 shstr (const shstr &sh) 138 shstr (const shstr &sh)
82 : s (sh.s) 139 : shstr_tmp (sh)
83 { 140 {
84 ++refcnt (); 141 ++refcnt ();
85 } 142 }
86 143
144 shstr (const shstr_tmp &sh)
145 : shstr_tmp (sh)
146 {
147 ++refcnt ();
148 }
149
87 explicit shstr (const char *s) 150 explicit shstr (const char *str)
88 : s (intern (s))
89 { 151 {
152 s = is_constant (str) && !str ? null : intern (str);
90 } 153 }
91 154
92 ~shstr () 155 ~shstr ()
93 { 156 {
94 --refcnt (); 157 --refcnt ();
95 } 158 }
96 159
160 using shstr_tmp::operator &;
161 using shstr_tmp::operator const char *;
162
163 // (note: not the copy constructor)
97 const shstr &operator =(const shstr &sh) 164 shstr &operator =(const shstr_tmp &sh)
98 { 165 {
99 --refcnt (); 166 --refcnt ();
100 s = sh.s; 167 s = sh.s;
101 ++refcnt (); 168 ++refcnt ();
102 169
103 return *this; 170 return *this;
104 } 171 }
105 172
173 // here it comes
174 shstr &operator =(const shstr &sh)
175 {
176 return (*this) = (shstr_tmp)sh;
177 }
178
179 // shstr_tmp doesn't have this one
106 const shstr &operator =(const char *str) 180 shstr &operator =(const char *str)
107 { 181 {
108 --refcnt (); 182 --refcnt ();
109 183 s = is_constant (str) && !str ? null : intern (str);
110 // this optimises the important case of str == constant 0
111 if (is_constant (str))
112 s = str ? intern (str) : null;
113 else
114 s = intern (str);
115 184
116 return *this; 185 return *this;
117 } 186 }
118
119 bool operator ==(const shstr &b)
120 {
121 return s == b.s;
122 }
123
124 bool operator !=(const shstr &b)
125 {
126 return !(*this == b);
127 }
128}; 187};
129 188
130inline int strlen (const shstr &sh)
131{
132 return sh.length ();
133}
134
135inline int strcmp (const shstr &a, const shstr &b)
136{
137 // TODO: use this to find all the occurences of people using strcmp
138 // all uses should be bogus, as we should be never interested in
139 // comparing shstr's alphabetically
140#if 0
141 extern void do_not_use_strcmp_to_compare_shstr_values ();
142 do_not_use_strcmp_to_compare_shstr_values ();
143#endif
144 return a != b;
145}
146
147static std::ostream &operator <<(std::ostream &o, const shstr &sh)
148{
149 o.write (sh.s, sh.length ());
150 return o;
151}
152
153// only good for mass comparisons to shstr objects 189// only good for mass comparisons to shstr objects, or very
190// temporary passing, basically a non-refcounted shstr
154struct shstr_cmp 191struct shstr_cmp
155{ 192{
156 const char *s; 193 const char *s;
157 194
158 explicit shstr_cmp (const char *s) 195 explicit shstr_cmp (const char *str)
159 : s (shstr::find (s)) 196 : s (shstr::find (str))
160 { 197 {
161 } 198 }
162 199
163 shstr_cmp (const shstr_cmp &sh) 200 shstr_cmp (const shstr_cmp &sh)
164 : s (sh.s) 201 : s (sh.s)
165 { 202 {
166 } 203 }
167 204
205 shstr_cmp (const shstr &sh)
206 : s (sh.s)
207 {
208 }
209
210 // this is used for informational messages and the like
211 const char *operator &() const { return s; }
212
168 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } 213 shstr_cmp operator =(const shstr_cmp sh) { s = sh.s; return *this; }
169 operator const char *() const { return s; } 214 operator const char *() const { return s; }
170}; 215};
171 216
172inline bool operator ==(const shstr_cmp &a, const shstr &b) 217inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
173{ 218{
174 return a.s == b.s; 219 return a.s == b.s;
175} 220}
176 221
177inline bool operator ==(const shstr &a, const shstr_cmp &b) 222inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
178{ 223{
179 return b == a; 224 return a.s == b.s;
180} 225}
181 226
182extern const shstr undead_name; /* Used in hit_player() in main.c */ 227extern const shstr shstr_null;
228
229#define def(str) extern const shstr shstr_ ## str;
230# include "shstrinc.h"
231#undef def
183 232
184#endif 233#endif
185 234

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