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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.10 by root, Tue Sep 12 18:15:34 2006 UTC vs.
Revision 1.36 by root, Tue Nov 10 00:01:31 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
4#include "util.h" 29#include "traits.h"
30
31extern size_t shstr_alloc;
5 32
6extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 33extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
7 34
35template<int size>
8struct shstr 36struct shstr_vec
9{ 37{
10 static const char *null; 38 uint32_t hash;
39 uint32_t len;
40 uint32_t refcnt;
41 // pointer points here
42 char string [size];
43};
44
45// this class is a non-refcounted shared string
46// it cannot be used to create or store shared strings, but
47// it can be used to apss shared strings around, i.e. as function arguments
48// or return values. their lifetime must not span a gc () call, i.e.
49// they are only valid as temporary values within the same server tick.
50struct shstr_tmp
51{
52 static shstr_vec<sizeof ("(null)")> nullvec;
53 static const char *null () { return nullvec.string; } // this is the null pointer value
11 54
12 const char *s; 55 const char *s;
13 56
14 static int &refcnt (const char *s) 57 static unsigned int &hash (const char *s)
15 { 58 {
16 return *((int *)s - 1); 59 return *((unsigned int *)s - 3);
17 } 60 }
18 61
62 int hash () const
63 {
64 return hash (s);
65 }
66
19 static int &length (const char *s) 67 static unsigned int &length (const char *s)
20 { 68 {
21 return *((int *)s - 2); 69 return *((unsigned int *)s - 2);
22 } 70 }
23 71
24 int &refcnt () const 72 int length () const
73 {
74 return length (s);
75 }
76
77 // returns whether this shared string begins with the given prefix,
78 // used mainly for searches when users give only the start of a name.
79 bool starts_with (const char *prefix) const
80 {
81 int plen = strlen (prefix);
82
83 return length () >= plen && !strncasecmp (s, prefix, plen);
84 }
85
86 // returns true if the substring is contained in the shstr
87 // if the shstr is 0, then this always returns false.
88 // the shstr is (theoretically) treated as a comma/colon/space etc. separated list.
89 bool contains (const char *substring) const
90 {
91 return s != null () && strstr (s, substring);
92 }
93
94 //TODO: case sensitive should be eradicated
95 bool eq_nc (const char *otherstring) const
96 {
97 return !strcasecmp (s, otherstring);
98 }
99
100 shstr_tmp ()
101 : s (null ())
102 {
103 }
104
105 shstr_tmp (const shstr_tmp &sh)
106 : s (sh.s)
107 {
108 }
109
110 shstr_tmp operator =(const shstr_tmp &sh)
111 {
112 s = sh.s;
113
114 return *this;
115 }
116
117 // this is used for informational messages and the like
118 const char *operator &() const { return s; }
119
120 operator const char *() const { return s == null () ? 0 : s; }
121
122protected:
123 // dummy is there so it isn't used as type converter accidentally
124 shstr_tmp (int dummy, const char *s)
125 : s(s)
126 {
127 }
128};
129
130inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
131{
132 return a.s == b.s;
133}
134
135inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
136{
137 return a.s != b.s;
138}
139
140inline int strlen (shstr_tmp sh)
141{
142 return sh.length ();
143}
144
145static inline std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
146{
147 o.write (sh.s, sh.length ());
148
149 return o;
150}
151
152struct shstr : shstr_tmp
153{
154 static unsigned int &refcnt (const char *s)
155 {
156 return *((unsigned int *)s - 1);
157 }
158
159 unsigned int &refcnt () const
25 { 160 {
26 return refcnt (s); 161 return refcnt (s);
27 } 162 }
28 163
29 int length () const 164 shstr ()
30 { 165 {
31 return length (s);
32 } 166 }
33 167
34 static const char *find (const char *s); 168 static const char *find (const char *s);
35 static const char *intern (const char *s); 169 static const char *intern (const char *s);
36 170
37 static void gc (); // garbage collect a few strings 171 static void gc (); // garbage collect a few strings
38 172
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) 173 shstr (const shstr &sh)
51 : s (sh.s) 174 : shstr_tmp (sh)
52 { 175 {
53 ++refcnt (); 176 ++refcnt ();
54 } 177 }
55 178
179 shstr (const shstr_tmp &sh)
180 : shstr_tmp (sh)
181 {
182 ++refcnt ();
183 }
184
56 explicit shstr (const char *s) 185 explicit shstr (const char *str)
57 : s (intern (s)) 186 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
58 { 187 {
59 } 188 }
60 189
61 ~shstr () 190 ~shstr ()
62 { 191 {
63 --refcnt (); 192 --refcnt ();
64 } 193 }
65 194
195 using shstr_tmp::operator &;
196 using shstr_tmp::operator const char *;
197
198 // (note: not the copy constructor)
66 const shstr &operator =(const shstr &sh) 199 shstr &operator =(const shstr_tmp &sh)
67 { 200 {
68 --refcnt (); 201 --refcnt ();
69 s = sh.s; 202 s = sh.s;
70 ++refcnt (); 203 ++refcnt ();
71 204
72 return *this; 205 return *this;
73 } 206 }
74 207
208 // here it comes
209 shstr &operator =(const shstr &sh)
210 {
211 return (*this) = (shstr_tmp)sh;
212 }
213
214 // shstr_tmp doesn't have this one
75 const shstr &operator =(const char *str) 215 shstr &operator =(const char *str)
76 { 216 {
77 --refcnt (); 217 --refcnt ();
78 218 s = is_constant (str) && !str ? null () : intern (str);
79 // this optimises the important case of str == constant 0
80 if (is_constant (str))
81 s = str ? intern (str) : null;
82 else
83 s = intern (str);
84 219
85 return *this; 220 return *this;
86 } 221 }
87
88 bool operator ==(const shstr &b)
89 {
90 return s == b.s;
91 }
92
93 bool operator !=(const shstr &b)
94 {
95 return !(*this == b);
96 }
97}; 222};
98 223
99inline int strlen (const shstr &sh)
100{
101 return sh.length ();
102}
103
104// only good for mass comparisons to shstr objects 224// only good for mass comparisons to shstr objects, or very
225// temporary passing, basically a non-refcounted shstr
105struct shstr_cmp 226struct shstr_cmp
106{ 227{
107 const char *s; 228 const char *s;
108 229
230 // initialies to the non-matching string (as opposed to the null string)
231 shstr_cmp ()
232 {
233 s = 0;
234 }
235
109 explicit shstr_cmp (const char *s) 236 shstr_cmp (const char *str)
110 : s (shstr::find (s)) 237 : s (shstr::find (str))
111 { 238 {
112 } 239 }
240
241 shstr_cmp (shstr_tmp sh)
242 : s (sh.s)
243 {
244 }
245
246 // this is used for informational messages and the like
247 const char *operator &() const { return s; }
113 248
114 operator const char *() const { return s; } 249 operator const char *() const { return s; }
115}; 250};
116 251
117inline bool operator ==(const shstr_cmp &a, const shstr &b) 252inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
118{ 253{
119 return a.s == b.s; 254 return a.s == b.s;
120} 255}
121 256
122inline bool operator ==(const shstr &a, const shstr_cmp &b) 257inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
123{ 258{
124 return b == a; 259 return a.s == b.s;
125} 260}
126 261
127extern const shstr undead_name; /* Used in hit_player() in main.c */ 262#define def2(id,str) extern const shstr id;
263#define def(id) def2(shstr_ ## id, # id)
264# include "shstrinc.h"
265#undef def
266#undef def2
267
268// undefined external reference to catch people using str* functions when they shouldn't
269//template<class any> void strcmp (const shstr_tmp &a, any b);
270template<class any> void strstr (const shstr_tmp &a, any b);
128 271
129#endif 272#endif
130 273

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