ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/deliantra/server/include/shstr.h
(Generate patch)

Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.7 by root, Sun Sep 3 09:00:09 2006 UTC vs.
Revision 1.34 by root, Tue Nov 3 23:44:21 2009 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007,2008,2009 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 *
6 * Deliantra is free software: you can redistribute it and/or modify it under
7 * the terms of the Affero GNU General Public License as published by the
8 * Free Software Foundation, either version 3 of the License, or (at your
9 * 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 Affero GNU General Public License
17 * and the GNU General Public License along with this program. If not, see
18 * <http://www.gnu.org/licenses/>.
19 *
20 * The authors can be reached via e-mail to <support@deliantra.net>
21 */
22
1#ifndef SHSTR_H__ 23#ifndef SHSTR_H__
2#define SHSTR_H__ 24#define SHSTR_H__
3 25
26#include <cstring>
27#include <sstream>
28
29#include "traits.h"
30
31extern size_t shstr_alloc;
32
4extern int buf_overflow(const char *buf1, const char *buf2, int bufsize); 33extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
5 34
35template<int size>
6struct shstr 36struct shstr_vec
7{ 37{
38 uint32_t len;
39 uint32_t refcnt;
40 char string[size];
41};
42
43// this class is a non-refcounted shared string
44// it cannot be used to create or store shared strings, but
45// it can be used to apss shared strings around, i.e. as function arguments
46// or return values. their lifetime must not span a gc () call, i.e.
47// they are only valid as temporary values within the same server tick.
48struct shstr_tmp
49{
50 static shstr_vec<sizeof ("(null)")> nullvec;
51 static const char *null () { return nullvec.string; } // this is the null pointer value
52
8 const char *s; 53 const char *s;
9 54
10 static int &refcnt (const char *s)
11 {
12 return *((int *)s - 1);
13 }
14
15 static int &length (const char *s) 55 static unsigned int &length (const char *s)
16 { 56 {
17 return *((int *)s - 2); 57 return *((unsigned int *)s - 2);
18 } 58 }
19 59
20 int &refcnt () const 60 int length () const
61 {
62 return length (s);
63 }
64
65 // returns whether this shared string begins with the given prefix,
66 // used mainly for searches when users give only the start of a name.
67 bool starts_with (const char *prefix) const
68 {
69 int plen = strlen (prefix);
70
71 return length () >= plen && !strncasecmp (s, prefix, plen);
72 }
73
74 // returns true if the substring is contained in the shstr
75 // if the shstr is 0, then this always returns false.
76 // the shstr is (theoretically) treated as a comma/colon/space etc. separated list.
77 bool contains (const char *substring) const
78 {
79 return s != null () && strstr (s, substring);
80 }
81
82 //TODO: case sensitive should be eradicated
83 bool eq_nc (const char *otherstring) const
84 {
85 return !strcasecmp (s, otherstring);
86 }
87
88 shstr_tmp ()
89 : s (null ())
90 {
91 }
92
93 shstr_tmp (const shstr_tmp &sh)
94 : s (sh.s)
95 {
96 }
97
98 shstr_tmp operator =(const shstr_tmp &sh)
99 {
100 s = sh.s;
101
102 return *this;
103 }
104
105 // this is used for informational messages and the like
106 const char *operator &() const { return s; }
107
108 operator const char *() const { return s == null () ? 0 : s; }
109
110protected:
111 // dummy is there so it isn't used as type converter accidentally
112 shstr_tmp (int dummy, const char *s)
113 : s(s)
114 {
115 }
116};
117
118inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
119{
120 return a.s == b.s;
121}
122
123inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
124{
125 return a.s != b.s;
126}
127
128inline int strlen (shstr_tmp sh)
129{
130 return sh.length ();
131}
132
133static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
134{
135 o.write (sh.s, sh.length ());
136
137 return o;
138}
139
140struct shstr : shstr_tmp
141{
142 static unsigned int &refcnt (const char *s)
143 {
144 return *((unsigned int *)s - 1);
145 }
146
147 unsigned int &refcnt () const
21 { 148 {
22 return refcnt (s); 149 return refcnt (s);
23 } 150 }
24 151
25 int length () const 152 shstr ()
26 { 153 {
27 return s ? length (s) : 0;
28 } 154 }
29 155
30 static const char *find (const char *s); 156 static const char *find (const char *s);
31 static const char *intern (const char *s); 157 static const char *intern (const char *s);
32 158
33 static void gc (); // garbage collect a few strings 159 static void gc (); // garbage collect a few strings
34 160
161 shstr (const shstr &sh)
162 : shstr_tmp (sh)
163 {
164 ++refcnt ();
165 }
166
167 shstr (const shstr_tmp &sh)
168 : shstr_tmp (sh)
169 {
170 ++refcnt ();
171 }
172
173 explicit shstr (const char *str)
174 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
175 {
176 }
177
178 ~shstr ()
179 {
180 --refcnt ();
181 }
182
183 using shstr_tmp::operator &;
184 using shstr_tmp::operator const char *;
185
186 // (note: not the copy constructor)
187 shstr &operator =(const shstr_tmp &sh)
188 {
189 --refcnt ();
190 s = sh.s;
191 ++refcnt ();
192
193 return *this;
194 }
195
196 // here it comes
197 shstr &operator =(const shstr &sh)
198 {
199 return (*this) = (shstr_tmp)sh;
200 }
201
202 // shstr_tmp doesn't have this one
203 shstr &operator =(const char *str)
204 {
205 --refcnt ();
206 s = is_constant (str) && !str ? null () : intern (str);
207
208 return *this;
209 }
210};
211
212// only good for mass comparisons to shstr objects, or very
213// temporary passing, basically a non-refcounted shstr
214struct shstr_cmp
215{
216 const char *s;
217
218 // initialies to the non-matching string (as opposed to the null string)
219 shstr_cmp ()
220 {
221 s = 0;
222 }
223
224 shstr_cmp (const char *str)
225 : s (shstr::find (str))
226 {
227 }
228
229 shstr_cmp (shstr_tmp sh)
230 : s (sh.s)
231 {
232 }
233
35 // this is used for informational messages and the like 234 // this is used for informational messages and the like
36 const char *operator &() const { return s ? s : "<nil>"; }
37
38 const char &operator [](int i) const { return s[i]; } 235 const char *operator &() const { return s; }
236
39 operator const char *() const { return s; } 237 operator const char *() const { return s; }
40
41 shstr ()
42 : s (0)
43 {
44 }
45
46 shstr (const shstr &sh)
47 : s (sh.s)
48 {
49 if (s) ++refcnt ();
50 }
51
52 explicit shstr (const char *s)
53 : s (intern (s))
54 {
55 }
56
57 ~shstr ()
58 {
59 if (s) --refcnt ();
60 }
61
62 const shstr &operator =(const shstr &sh)
63 {
64 if (s) --refcnt ();
65 s = sh.s;
66 if (s) ++refcnt ();
67
68 return *this;
69 }
70
71 const shstr &operator =(const char *str)
72 {
73 if (s) --refcnt ();
74 s = intern (str);
75
76 return *this;
77 }
78}; 238};
79 239
80inline int strlen (const shstr &sh)
81{
82 return sh.length ();
83}
84
85inline bool operator ==(const shstr &a, const shstr &b) 240inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
86{ 241{
87 return a.s == b.s; 242 return a.s == b.s;
88} 243}
89 244
90inline bool operator !=(const shstr &a, const shstr &b) 245inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
91{ 246{
92 return !(a == b); 247 return a.s == b.s;
93} 248}
249
250#define def2(id,str) extern const shstr id;
251#define def(id) def2(shstr_ ## id, # id)
252# include "shstrinc.h"
253#undef def
254#undef def2
255
256// undefined external reference to catch people using str* functions when they shouldn't
257//template<class any> void strcmp (const shstr_tmp &a, any b);
258template<class any> void strstr (const shstr_tmp &a, any b);
94 259
95#endif 260#endif
96 261

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines