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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 1.32 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
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 // 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 {
143 return *((unsigned int *)s - 1);
144 }
145
146 unsigned int &refcnt () const
25 { 147 {
26 return refcnt (s); 148 return refcnt (s);
27 } 149 }
28 150
29 int length () const 151 shstr ()
30 { 152 {
31 return length (s);
32 } 153 }
33 154
34 static const char *find (const char *s); 155 static const char *find (const char *s);
35 static const char *intern (const char *s); 156 static const char *intern (const char *s);
36 157
37 static void gc (); // garbage collect a few strings 158 static void gc (); // garbage collect a few strings
38 159
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) 160 shstr (const shstr &sh)
51 : s (sh.s) 161 : shstr_tmp (sh)
52 { 162 {
53 ++refcnt (); 163 ++refcnt ();
54 } 164 }
55 165
166 shstr (const shstr_tmp &sh)
167 : shstr_tmp (sh)
168 {
169 ++refcnt ();
170 }
171
56 explicit shstr (const char *s) 172 explicit shstr (const char *str)
57 : s (intern (s)) 173 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
58 { 174 {
59 } 175 }
60 176
61 ~shstr () 177 ~shstr ()
62 { 178 {
63 --refcnt (); 179 --refcnt ();
64 } 180 }
65 181
182 using shstr_tmp::operator &;
183 using shstr_tmp::operator const char *;
184
185 // (note: not the copy constructor)
66 const shstr &operator =(const shstr &sh) 186 shstr &operator =(const shstr_tmp &sh)
67 { 187 {
68 --refcnt (); 188 --refcnt ();
69 s = sh.s; 189 s = sh.s;
70 ++refcnt (); 190 ++refcnt ();
71 191
72 return *this; 192 return *this;
73 } 193 }
74 194
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
75 const shstr &operator =(const char *str) 202 shstr &operator =(const char *str)
76 { 203 {
77 --refcnt (); 204 --refcnt ();
205 s = is_constant (str) && !str ? null () : intern (str);
78 206
79#if 0 207 return *this;
80 // this optimises the important case of str == constant 0 208 }
81 if (is_constant (str)) 209};
82 s = str ? intern (str) : null; 210
83 else 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
233 // this is used for informational messages and the like
234 const char *operator &() const { return s; }
235
236 operator const char *() const { return s; }
237};
238
239inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
240{
241 return a.s == b.s;
242}
243
244inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
245{
246 return a.s == b.s;
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);
258
84#endif 259#endif
85 s = intern (str);
86 260
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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