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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 1.32 by root, Thu Jan 1 20:49:48 2009 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 "traits.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
34template<int size>
6struct shstr 35struct shstr_vec
7{ 36{
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
51
8 const char *s; 52 const char *s;
9 53
10 int &refcnt () 54 static unsigned int &length (const char *s)
11 { 55 {
56 return *((unsigned int *)s - 2);
57 }
58
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 // returns true if the substring is contained in the shstr
74 // if the shstr is 0, then this always returns false.
75 // the shstr is (theoretically) treated as a comma/colon/space etc. separated list.
76 bool contains (const char *substring) const
77 {
78 return s != null () && strstr (s, substring);
79 }
80
81 //TODO: case sensitive should be eradicated
82 bool eq_nc (const char *otherstring) const
83 {
84 return !strcasecmp (s, otherstring);
85 }
86
87 shstr_tmp ()
88 : s (null ())
89 {
90 }
91
92 shstr_tmp (const shstr_tmp &sh)
93 : s (sh.s)
94 {
95 }
96
97 shstr_tmp operator =(const shstr_tmp &sh)
98 {
99 s = sh.s;
100
101 return *this;
102 }
103
104 // this is used for informational messages and the like
105 const char *operator &() const { return s; }
106
107 operator const char *() const { return s == null () ? 0 : s; }
108
109protected:
110 // dummy is there so it isn't used as type converter accidentally
111 shstr_tmp (int dummy, const char *s)
112 : s(s)
113 {
114 }
115};
116
117inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
118{
119 return a.s == b.s;
120}
121
122inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
123{
124 return a.s != b.s;
125}
126
127inline int strlen (shstr_tmp sh)
128{
129 return sh.length ();
130}
131
132static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
133{
134 o.write (sh.s, sh.length ());
135
136 return o;
137}
138
139struct shstr : shstr_tmp
140{
141 static unsigned int &refcnt (const char *s)
142 {
12 return *((int *)s - 1); 143 return *((unsigned int *)s - 1);
144 }
145
146 unsigned int &refcnt () const
147 {
148 return refcnt (s);
149 }
150
151 shstr ()
152 {
13 } 153 }
14 154
15 static const char *find (const char *s); 155 static const char *find (const char *s);
16 static const char *intern (const char *s); 156 static const char *intern (const char *s);
17 157
18 static void gc (); // garbage collect a few strings 158 static void gc (); // garbage collect a few strings
19 159
160 shstr (const shstr &sh)
161 : shstr_tmp (sh)
162 {
163 ++refcnt ();
164 }
165
166 shstr (const shstr_tmp &sh)
167 : shstr_tmp (sh)
168 {
169 ++refcnt ();
170 }
171
172 explicit shstr (const char *str)
173 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
174 {
175 }
176
177 ~shstr ()
178 {
179 --refcnt ();
180 }
181
182 using shstr_tmp::operator &;
183 using shstr_tmp::operator const char *;
184
185 // (note: not the copy constructor)
186 shstr &operator =(const shstr_tmp &sh)
187 {
188 --refcnt ();
189 s = sh.s;
190 ++refcnt ();
191
192 return *this;
193 }
194
195 // here it comes
196 shstr &operator =(const shstr &sh)
197 {
198 return (*this) = (shstr_tmp)sh;
199 }
200
201 // shstr_tmp doesn't have this one
202 shstr &operator =(const char *str)
203 {
204 --refcnt ();
205 s = is_constant (str) && !str ? null () : intern (str);
206
207 return *this;
208 }
209};
210
211// only good for mass comparisons to shstr objects, or very
212// temporary passing, basically a non-refcounted shstr
213struct shstr_cmp
214{
215 const char *s;
216
217 // initialies to the non-matching string (as opposed to the null string)
218 shstr_cmp ()
219 {
220 s = 0;
221 }
222
223 shstr_cmp (const char *str)
224 : s (shstr::find (str))
225 {
226 }
227
228 shstr_cmp (shstr_tmp sh)
229 : s (sh.s)
230 {
231 }
232
20 // this is used for informational messages and the like 233 // 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]; } 234 const char *operator &() const { return s; }
235
24 operator const char *() const { return s; } 236 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}; 237};
70 238
71inline int strlen (const shstr &sh)
72{
73 return sh.length ();
74}
75
76inline bool operator ==(const shstr &a, const shstr &b) 239inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
77{ 240{
78 return a.s == b.s; 241 return a.s == b.s;
79} 242}
80 243
81inline bool operator !=(const shstr &a, const shstr &b) 244inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
82{ 245{
83 return !(a == b); 246 return a.s == b.s;
84} 247}
248
249#define def2(id,str) extern const shstr id;
250#define def(id) def2(shstr_ ## id, # id)
251# include "shstrinc.h"
252#undef def
253#undef def2
254
255// undefined external reference to catch people using str* functions when they shouldn't
256//template<class any> void strcmp (const shstr_tmp &a, any b);
257template<class any> void strstr (const shstr_tmp &a, any b);
85 258
86#endif 259#endif
87 260

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