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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 1.45 by root, Sat Nov 17 23:40:01 2018 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team
5 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
6 *
7 * Deliantra is free software: you can redistribute it and/or modify it under
8 * the terms of the Affero GNU General Public License as published by the
9 * Free Software Foundation, either version 3 of the License, or (at your
10 * option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the Affero GNU General Public License
18 * and the GNU General Public License along with this program. If not, see
19 * <http://www.gnu.org/licenses/>.
20 *
21 * The authors can be reached via e-mail to <support@deliantra.net>
22 */
23
1#ifndef SHSTR_H__ 24#ifndef SHSTR_H__
2#define SHSTR_H__ 25#define SHSTR_H__
3 26
27#include <cstring>
28#include <sstream>
29
30#include "traits.h"
31
32extern size_t shstr_alloc;
33
4extern int buf_overflow(const char *buf1, const char *buf2, int bufsize); 34extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
5 35
36template<int size>
6struct shstr 37struct shstr_vec
7{ 38{
39 uint32_t hash;
40 uint32_t len;
41 uint32_t refcnt;
42 // pointer points here
43 char string [size];
44};
45
46// this class is a non-refcounted shared string
47// it cannot be used to create or store shared strings, but
48// it can be used to pass shared strings around, i.e. as function arguments
49// or return values. their lifetime must not span a gc () call, i.e.
50// they are only valid as temporary values within the same server tick.
51struct shstr_tmp
52{
53 static shstr_vec<sizeof ("(null)")> nullvec;
54 static const char *null () { return nullvec.string; } // this is the null pointer value
55
8 const char *s; 56 const char *s;
9 57
10 int &refcnt () 58 static unsigned int &hash (const char *s)
11 { 59 {
60 return *((unsigned int *)s - 3);
61 }
62
63 int hash () const
64 {
65 return hash (s);
66 }
67
68 static unsigned int &length (const char *s)
69 {
70 return *((unsigned int *)s - 2);
71 }
72
73 int length () const
74 {
75 return length (s);
76 }
77
78 // returns whether this shared string begins with the given prefix,
79 // used mainly for searches when users give only the start of a name.
80 bool starts_with (const char *prefix) const
81 {
82 int plen = strlen (prefix);
83
84 return length () >= plen && !strncasecmp (s, prefix, plen);
85 }
86
87 // returns true if the substring is contained in the shstr
88 // if the shstr is 0, then this always returns false.
89 // the shstr is (theoretically) treated as a comma/colon/space etc. separated list.
90 bool contains (const char *substring) const;
91
92 //TODO: case sensitive should be eradicated
93 bool eq_nc (const char *otherstring) const
94 {
95 return !strcasecmp (s, otherstring);
96 }
97
98 shstr_tmp ()
99 : s (null ())
100 {
101 }
102
103 shstr_tmp (const shstr_tmp &sh)
104 : s (sh.s)
105 {
106 }
107
108 shstr_tmp operator =(const shstr_tmp &sh)
109 {
110 s = sh.s;
111
112 return *this;
113 }
114
115 // this is used for informational messages and the like
116 const char *operator &() const { return s; }
117
118 operator const char *() const { return s == null () ? 0 : s; }
119
120protected:
121 // dummy is there so it isn't used as type converter accidentally
122 shstr_tmp (int dummy, const char *s)
123 : s(s)
124 {
125 }
126};
127
128inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
129{
130 return a.s == b.s;
131}
132
133inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
134{
135 return a.s != b.s;
136}
137
138inline int strlen (shstr_tmp sh)
139{
140 return sh.length ();
141}
142
143static inline std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
144{
145 o.write (sh.s, sh.length ());
146
147 return o;
148}
149
150struct shstr : shstr_tmp
151{
152 static unsigned int &refcnt (const char *s)
153 {
12 return *((int *)s - 1); 154 return *((unsigned int *)s - 1);
155 }
156
157 unsigned int &refcnt () const
158 {
159 return refcnt (s);
160 }
161
162 shstr ()
163 {
13 } 164 }
14 165
15 static const char *find (const char *s); 166 static const char *find (const char *s);
16 static const char *intern (const char *s); 167 static const char *intern (const char *s);
17 168
18 static void gc (); // garbage collect a few strings 169 static void gc (); // garbage collect a few strings
19 170
171 shstr (const shstr &sh)
172 : shstr_tmp (sh)
173 {
174 ++refcnt ();
175 }
176
177 shstr (const shstr_tmp &sh)
178 : shstr_tmp (sh)
179 {
180 ++refcnt ();
181 }
182
183 explicit shstr (const char *str)
184 : shstr_tmp (0, ecb_is_constant (str) && !str ? null () : intern (str))
185 {
186 }
187
188 ~shstr ()
189 {
190 --refcnt ();
191 }
192
193 using shstr_tmp::operator &;
194 using shstr_tmp::operator const char *;
195
196 // (note: not the copy constructor)
197 shstr &operator =(const shstr_tmp &sh)
198 {
199 --refcnt ();
200 s = sh.s;
201 ++refcnt ();
202
203 return *this;
204 }
205
206 // here it comes
207 shstr &operator =(const shstr &sh)
208 {
209 return (*this) = (shstr_tmp)sh;
210 }
211
212 // shstr_tmp doesn't have this one
213 shstr &operator =(const char *str)
214 {
215 --refcnt ();
216 s = ecb_is_constant (str) && !str ? null () : intern (str);
217
218 return *this;
219 }
220};
221
222// only good for mass comparisons to shstr objects, or very
223// temporary passing, basically a non-refcounted shstr
224struct shstr_cmp
225{
226 const char *s;
227
228 // initialies to the non-matching string (as opposed to the null string)
229 shstr_cmp ()
230 {
231 s = 0;
232 }
233
234 shstr_cmp (const char *str)
235 : s (shstr::find (str))
236 {
237 }
238
239 shstr_cmp (shstr_tmp sh)
240 : s (sh.s)
241 {
242 }
243
20 // this is used for informational messages and the like 244 // 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]; } 245 const char *operator &() const { return s; }
246
24 operator const char *() const { return s; } 247 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}; 248};
70 249
71inline int strlen (const shstr &sh)
72{
73 return sh.length ();
74}
75
76inline bool operator ==(const shstr &a, const shstr &b) 250inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
77{ 251{
78 return a.s == b.s; 252 return a.s == b.s;
79} 253}
80 254
81inline bool operator !=(const shstr &a, const shstr &b) 255inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
82{ 256{
83 return !(a == b); 257 return a.s == b.s;
84} 258}
259
260#define def2(id,str) extern const shstr id;
261#define def(id) def2(shstr_ ## id, # id)
262# include "shstrinc.h"
263#undef def
264#undef def2
265
266// undefined external reference to catch people using str* functions when they shouldn't
267//template<class any> void strcmp (const shstr_tmp &a, any b);
268template<class any> void strstr (const shstr_tmp &a, any b);
85 269
86#endif 270#endif
87 271

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