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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.8 by root, Sun Sep 3 23:33:01 2006 UTC vs.
Revision 1.26 by root, Wed Dec 31 18:25:12 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
4#include "util.h" 28#include "traits.h"
29
30extern size_t shstr_alloc;
5 31
6extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
7 33
34template<int size>
8struct shstr 35struct shstr_vec
9{ 36{
10 static const char *null; 37 uint32_t len;
38 uint32_t refcnt;
39 char string[size];
40};
41
42// this class is a non-refcounted shared string
43// it cannot be used to create or store shared strings, but
44// it can be used to apss shared strings around, i.e. as function arguments
45// or return values. their lifetime must not span a gc () call, i.e.
46// they are only valid as temporary values within the same server tick.
47struct shstr_tmp
48{
49 static shstr_vec<sizeof ("(null)")> nullvec;
50 static const char *null () { return nullvec.string; } // this is the null pointer value
11 51
12 const char *s; 52 const char *s;
13 53
14 static int &refcnt (const char *s)
15 {
16 return *((int *)s - 1);
17 }
18
19 static int &length (const char *s) 54 static unsigned int &length (const char *s)
20 { 55 {
21 return *((int *)s - 2); 56 return *((unsigned int *)s - 2);
22 } 57 }
23 58
24 int &refcnt () const 59 int length () const
60 {
61 return length (s);
62 }
63
64 // returns whether this shared string begins with the given prefix,
65 // used mainly for searches when users give only the start of a name.
66 bool starts_with (const char *prefix) const
67 {
68 int plen = strlen (prefix);
69
70 return length () >= plen && !strncasecmp (s, prefix, plen);
71 }
72
73 bool contains (const char *substring) const
74 {
75 return strstr (s, substring);
76 }
77
78 shstr_tmp ()
79 : s (null ())
80 {
81 }
82
83 shstr_tmp (const shstr_tmp &sh)
84 : s (sh.s)
85 {
86 }
87
88 shstr_tmp operator =(const shstr_tmp &sh)
89 {
90 s = sh.s;
91
92 return *this;
93 }
94
95 // this is used for informational messages and the like
96 const char *operator &() const { return s; }
97
98 operator const char *() const { return s == null () ? 0 : s; }
99
100protected:
101 // dummy is there so it isn't used as type converter accidentally
102 shstr_tmp (int dummy, const char *s)
103 : s(s)
104 {
105 }
106};
107
108inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
109{
110 return a.s == b.s;
111}
112
113inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
114{
115 return a.s != b.s;
116}
117
118inline int strlen (const shstr_tmp &sh)
119{
120 return sh.length ();
121}
122
123// undefined external reference to catch people using strcmp when they shouldn't
124int strcmp (const shstr_tmp &a, const shstr_tmp &b);
125
126static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
127{
128 o.write (sh.s, sh.length ());
129
130 return o;
131}
132
133struct shstr : shstr_tmp
134{
135 static unsigned int &refcnt (const char *s)
136 {
137 return *((unsigned int *)s - 1);
138 }
139
140 unsigned int &refcnt () const
25 { 141 {
26 return refcnt (s); 142 return refcnt (s);
27 } 143 }
28 144
29 int length () const 145 shstr ()
30 { 146 {
31 return length (s);
32 } 147 }
33 148
34 static const char *find (const char *s); 149 static const char *find (const char *s);
35 static const char *intern (const char *s); 150 static const char *intern (const char *s);
36 151
37 static void gc (); // garbage collect a few strings 152 static void gc (); // garbage collect a few strings
38 153
39 // this is used for informational messages and the like
40 const char *operator &() const { return s; }
41
42 const char &operator [](int i) const { return s[i]; }
43 operator const char *() const { return s == null ? 0 : s; }
44
45 shstr ()
46 : s (null)
47 {
48 }
49
50 shstr (const shstr &sh) 154 shstr (const shstr &sh)
51 : s (sh.s) 155 : shstr_tmp (sh)
52 { 156 {
53 ++refcnt (); 157 ++refcnt ();
54 } 158 }
55 159
160 shstr (const shstr_tmp &sh)
161 : shstr_tmp (sh)
162 {
163 ++refcnt ();
164 }
165
56 explicit shstr (const char *s) 166 explicit shstr (const char *str)
57 : s (intern (s)) 167 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
58 { 168 {
59 } 169 }
60 170
61 ~shstr () 171 ~shstr ()
62 { 172 {
63 --refcnt (); 173 --refcnt ();
64 } 174 }
65 175
176 using shstr_tmp::operator &;
177 using shstr_tmp::operator const char *;
178
179 // (note: not the copy constructor)
66 const shstr &operator =(const shstr &sh) 180 shstr &operator =(const shstr_tmp &sh)
67 { 181 {
68 --refcnt (); 182 --refcnt ();
69 s = sh.s; 183 s = sh.s;
70 ++refcnt (); 184 ++refcnt ();
71 185
72 return *this; 186 return *this;
73 } 187 }
74 188
189 // here it comes
190 shstr &operator =(const shstr &sh)
191 {
192 return (*this) = (shstr_tmp)sh;
193 }
194
195 // shstr_tmp doesn't have this one
75 const shstr &operator =(const char *str) 196 shstr &operator =(const char *str)
76 { 197 {
77 --refcnt (); 198 --refcnt ();
199 s = is_constant (str) && !str ? null () : intern (str);
78 200
79#if 0 201 return *this;
80 // this optimises the important case of str == constant 0 202 }
81 if (is_constant (str)) 203};
82 s = str ? intern (str) : null; 204
83 else 205// only good for mass comparisons to shstr objects, or very
206// temporary passing, basically a non-refcounted shstr
207struct shstr_cmp
208{
209 const char *s;
210
211 explicit shstr_cmp (const char *str)
212 : s (shstr::find (str))
213 {
214 }
215
216 shstr_cmp (shstr_tmp sh)
217 : s (sh.s)
218 {
219 }
220
221 // this is used for informational messages and the like
222 const char *operator &() const { return s; }
223
224 operator const char *() const { return s; }
225};
226
227inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
228{
229 return a.s == b.s;
230}
231
232inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
233{
234 return a.s == b.s;
235}
236
237struct shstr_const : shstr_tmp
238{
239 shstr_const (const char *s)
240 : shstr_tmp (0, s)
241 {
242 }
243};
244
245#define def(str) extern const shstr_const shstr_ ## str;
246# include "shstrinc.h"
247#undef def
248
84#endif 249#endif
85 s = intern (str);
86 250
87 return *this;
88 }
89};
90
91inline int strlen (const shstr &sh)
92{
93 return sh.length ();
94}
95
96inline bool operator ==(const shstr &a, const shstr &b)
97{
98 return a.s == b.s;
99}
100
101inline bool operator !=(const shstr &a, const shstr &b)
102{
103 return !(a == b);
104}
105
106#endif
107

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