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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.6 by root, Sun Sep 3 07:57:56 2006 UTC vs.
Revision 1.24 by root, Wed Dec 31 17:35:37 2008 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 *
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
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
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/>.
18 *
19 * The authors can be reached via e-mail to <support@deliantra.net>
20 */
21
1#ifndef SHSTR_H__ 22#ifndef SHSTR_H__
2#define SHSTR_H__ 23#define SHSTR_H__
3 24
25#include <cstring>
26#include <sstream>
27
28#include "util.h"
29
30extern size_t shstr_alloc;
31
4extern int buf_overflow(const char *buf1, const char *buf2, int bufsize); 32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
5 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.
6struct shstr 39struct shstr_tmp
7{ 40{
41 static const char *null;
42
8 const char *s; 43 const char *s;
9 44
10 int &refcnt () 45 static unsigned int &length (const char *s)
11 { 46 {
47 return *((unsigned int *)s - 2);
48 }
49
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 {
12 return *((int *)s - 1); 121 return *((unsigned int *)s - 1);
122 }
123
124 unsigned int &refcnt () const
125 {
126 return refcnt (s);
127 }
128
129 shstr ()
130 {
13 } 131 }
14 132
15 static const char *find (const char *s); 133 static const char *find (const char *s);
16 static const char *intern (const char *s); 134 static const char *intern (const char *s);
17 135
18 static void gc (); // garbage collect a few strings 136 static void gc (); // garbage collect a few strings
19 137
138 shstr (const shstr &sh)
139 : shstr_tmp (sh)
140 {
141 ++refcnt ();
142 }
143
144 shstr (const shstr_tmp &sh)
145 : shstr_tmp (sh)
146 {
147 ++refcnt ();
148 }
149
150 explicit shstr (const char *str)
151 {
152 s = is_constant (str) && !str ? null : intern (str);
153 }
154
155 ~shstr ()
156 {
157 --refcnt ();
158 }
159
160 using shstr_tmp::operator &;
161 using shstr_tmp::operator const char *;
162
163 // (note: not the copy constructor)
164 shstr &operator =(const shstr_tmp &sh)
165 {
166 --refcnt ();
167 s = sh.s;
168 ++refcnt ();
169
170 return *this;
171 }
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
180 shstr &operator =(const char *str)
181 {
182 --refcnt ();
183 s = is_constant (str) && !str ? null : intern (str);
184
185 return *this;
186 }
187};
188
189// only good for mass comparisons to shstr objects, or very
190// temporary passing, basically a non-refcounted shstr
191struct shstr_cmp
192{
193 const char *s;
194
195 explicit shstr_cmp (const char *str)
196 : s (shstr::find (str))
197 {
198 }
199
200 shstr_cmp (const shstr_cmp &sh)
201 : s (sh.s)
202 {
203 }
204
205 shstr_cmp (const shstr &sh)
206 : s (sh.s)
207 {
208 }
209
20 // this is used for informational messages and the like 210 // this is used for informational messages and the like
21 const char *operator &() const { return s ? s : "<nil>"; }
22
23 const char &operator [](int i) const { return s[i]; } 211 const char *operator &() const { return s; }
212
213 shstr_cmp operator =(const shstr_cmp sh) { s = sh.s; return *this; }
24 operator const char *() const { return s; } 214 operator const char *() const { return s; }
25
26 int length () const
27 {
28 return s ? *((int *)s - 2) : 0;
29 }
30
31 shstr ()
32 : s (0)
33 {
34 }
35
36 shstr (const shstr &sh)
37 : s (sh.s)
38 {
39 if (s) ++refcnt ();
40 }
41
42 explicit shstr (const char *s)
43 : s (intern (s))
44 {
45 if (s) ++refcnt ();
46 }
47
48 ~shstr ()
49 {
50 if (s) --refcnt ();
51 }
52
53 const shstr &operator =(const shstr &sh)
54 {
55 if (s) --refcnt ();
56 s = sh.s;
57 if (s) ++refcnt ();
58
59 return *this;
60 }
61
62 const shstr &operator =(const char *str)
63 {
64 if (s) --refcnt ();
65 s = intern (str);
66
67 return *this;
68 }
69}; 215};
70 216
71inline int strlen (const shstr &sh)
72{
73 return sh.length ();
74}
75
76inline bool operator ==(const shstr &a, const shstr &b) 217inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
77{ 218{
78 return a.s == b.s; 219 return a.s == b.s;
79} 220}
80 221
81inline bool operator !=(const shstr &a, const shstr &b) 222inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
82{ 223{
83 return !(a == b); 224 return a.s == b.s;
84} 225}
226
227extern const shstr shstr_null;
228
229#define def(str) extern const shstr shstr_ ## str;
230# include "shstrinc.h"
231#undef def
85 232
86#endif 233#endif
87 234

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