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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 1.46 by root, Tue Nov 27 18:47:35 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
4#include "util.h" 30#include "traits.h"
31
32extern size_t shstr_alloc;
5 33
6extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 34extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
7 35
36template<int size>
8struct shstr 37struct shstr_vec
9{ 38{
10 static const char *null; 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
11 55
12 const char *s; 56 const char *s;
13 57
14 static int &refcnt (const char *s) 58 static unsigned int &hash (const char *s)
15 { 59 {
16 return *((int *)s - 1); 60 return *((unsigned int *)s - 3);
17 } 61 }
18 62
63 int hash () const
64 {
65 return hash (s);
66 }
67
19 static int &length (const char *s) 68 static unsigned int &length (const char *s)
20 { 69 {
21 return *((int *)s - 2); 70 return *((unsigned int *)s - 2);
22 } 71 }
23 72
24 int &refcnt () const 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 {
154 return *((unsigned int *)s - 1);
155 }
156
157 unsigned int &refcnt () const
25 { 158 {
26 return refcnt (s); 159 return refcnt (s);
27 } 160 }
28 161
29 int length () const 162 shstr ()
30 { 163 {
31 return length (s);
32 } 164 }
33 165
34 static const char *find (const char *s); 166 static const char *find (const char *s);
35 static const char *intern (const char *s); 167 static const char *intern (const char *s);
36 168
37 static void gc (); // garbage collect a few strings 169 static void gc (); // garbage collect a few strings
38 170
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) 171 shstr (const shstr_tmp &sh)
51 : s (sh.s) 172 : shstr_tmp (sh)
52 { 173 {
53 ++refcnt (); 174 ++refcnt ();
54 } 175 }
55 176
56 explicit shstr (const char *s) 177 explicit shstr (const char *str)
57 : s (intern (s)) 178 : shstr_tmp (0, ecb_is_constant (str) && !str ? null () : intern (str))
58 { 179 {
59 } 180 }
60 181
61 ~shstr () 182 ~shstr ()
62 { 183 {
63 --refcnt (); 184 --refcnt ();
64 } 185 }
65 186
187 using shstr_tmp::operator &;
188 using shstr_tmp::operator const char *;
189
190 // (note: not the copy constructor)
66 const shstr &operator =(const shstr &sh) 191 shstr &operator =(const shstr_tmp &sh)
67 { 192 {
68 --refcnt (); 193 --refcnt ();
69 s = sh.s; 194 s = sh.s;
70 ++refcnt (); 195 ++refcnt ();
71 196
72 return *this; 197 return *this;
73 } 198 }
74 199
200 // here it comes
201 shstr &operator =(const shstr &sh)
202 {
203 return (*this) = (shstr_tmp)sh;
204 }
205
206 // shstr_tmp doesn't have this one
75 const shstr &operator =(const char *str) 207 shstr &operator =(const char *str)
76 { 208 {
77 --refcnt (); 209 --refcnt ();
210 s = ecb_is_constant (str) && !str ? null () : intern (str);
78 211
79#if 0 212 return *this;
80 // this optimises the important case of str == constant 0 213 }
81 if (is_constant (str)) 214};
82 s = str ? intern (str) : null; 215
83 else 216// only good for mass comparisons to shstr objects, or very
217// temporary passing, basically a non-refcounted shstr
218struct shstr_cmp
219{
220 const char *s;
221
222 // initialies to the non-matching string (as opposed to the null string)
223 shstr_cmp ()
224 {
225 s = 0;
226 }
227
228 shstr_cmp (const char *str)
229 : s (shstr::find (str))
230 {
231 }
232
233 shstr_cmp (shstr_tmp sh)
234 : s (sh.s)
235 {
236 }
237
238 // this is used for informational messages and the like
239 const char *operator &() const { return s; }
240
241 operator const char *() const { return s; }
242};
243
244inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
245{
246 return a.s == b.s;
247}
248
249inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
250{
251 return a.s == b.s;
252}
253
254#define def2(id,str) extern const shstr id;
255#define def(id) def2(shstr_ ## id, # id)
256# include "shstrinc.h"
257#undef def
258#undef def2
259
260// undefined external reference to catch people using str* functions when they shouldn't
261//template<class any> void strcmp (const shstr_tmp &a, any b);
262template<class any> void strstr (const shstr_tmp &a, any b);
263
84#endif 264#endif
85 s = intern (str);
86 265
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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