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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.24 by root, Wed Dec 31 17:35:37 2008 UTC vs.
Revision 1.38 by root, Fri Mar 26 01:04:44 2010 UTC

1/* 1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team 4 * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 5 *
6 * Deliantra is free software: you can redistribute it and/or modify 6 * Deliantra is free software: you can redistribute it and/or modify it under
7 * it under the terms of the GNU General Public License as published by 7 * the terms of the Affero GNU General Public License as published by the
8 * the Free Software Foundation, either version 3 of the License, or 8 * Free Software Foundation, either version 3 of the License, or (at your
9 * (at your option) any later version. 9 * option) any later version.
10 * 10 *
11 * This program is distributed in the hope that it will be useful, 11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details. 14 * GNU General Public License for more details.
15 * 15 *
16 * You should have received a copy of the GNU General Public License 16 * You should have received a copy of the Affero GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 * and the GNU General Public License along with this program. If not, see
18 * <http://www.gnu.org/licenses/>.
18 * 19 *
19 * The authors can be reached via e-mail to <support@deliantra.net> 20 * The authors can be reached via e-mail to <support@deliantra.net>
20 */ 21 */
21 22
22#ifndef SHSTR_H__ 23#ifndef SHSTR_H__
23#define SHSTR_H__ 24#define SHSTR_H__
24 25
25#include <cstring> 26#include <cstring>
26#include <sstream> 27#include <sstream>
27 28
28#include "util.h" 29#include "traits.h"
29 30
30extern size_t shstr_alloc; 31extern size_t shstr_alloc;
31 32
32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 33extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
34
35template<int size>
36struct shstr_vec
37{
38 uint32_t hash;
39 uint32_t len;
40 uint32_t refcnt;
41 // pointer points here
42 char string [size];
43};
33 44
34// this class is a non-refcounted shared string 45// this class is a non-refcounted shared string
35// it cannot be used to create or store shared strings, but 46// it cannot be used to create or store shared strings, but
36// it can be used to apss shared strings around, i.e. as function arguments 47// it can be used to pass shared strings around, i.e. as function arguments
37// or return values. their lifetime must not span a gc () call, i.e. 48// or return values. their lifetime must not span a gc () call, i.e.
38// they are only valid as temporary values within the same server tick. 49// they are only valid as temporary values within the same server tick.
39struct shstr_tmp 50struct shstr_tmp
40{ 51{
41 static const char *null; 52 static shstr_vec<sizeof ("(null)")> nullvec;
53 static const char *null () { return nullvec.string; } // this is the null pointer value
42 54
43 const char *s; 55 const char *s;
56
57 static unsigned int &hash (const char *s)
58 {
59 return *((unsigned int *)s - 3);
60 }
61
62 int hash () const
63 {
64 return hash (s);
65 }
44 66
45 static unsigned int &length (const char *s) 67 static unsigned int &length (const char *s)
46 { 68 {
47 return *((unsigned int *)s - 2); 69 return *((unsigned int *)s - 2);
48 } 70 }
… …
59 int plen = strlen (prefix); 81 int plen = strlen (prefix);
60 82
61 return length () >= plen && !strncasecmp (s, prefix, plen); 83 return length () >= plen && !strncasecmp (s, prefix, plen);
62 } 84 }
63 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.
64 bool contains (const char *substring) const 89 bool contains (const char *substring) const
65 { 90 {
66 return strstr (s, substring); 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);
67 } 98 }
68 99
69 shstr_tmp () 100 shstr_tmp ()
70 : s (null) 101 : s (null ())
71 { 102 {
72 } 103 }
73 104
74 shstr_tmp (const shstr_tmp &sh) 105 shstr_tmp (const shstr_tmp &sh)
75 : s (sh.s) 106 : s (sh.s)
… …
84 } 115 }
85 116
86 // this is used for informational messages and the like 117 // this is used for informational messages and the like
87 const char *operator &() const { return s; } 118 const char *operator &() const { return s; }
88 119
89 operator const char *() const { return s == null ? 0 : s; } 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 }
90}; 128};
91 129
92inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b) 130inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
93{ 131{
94 return a.s == b.s; 132 return a.s == b.s;
… …
97inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b) 135inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
98{ 136{
99 return a.s != b.s; 137 return a.s != b.s;
100} 138}
101 139
102inline int strlen (const shstr_tmp &sh) 140inline int strlen (shstr_tmp sh)
103{ 141{
104 return sh.length (); 142 return sh.length ();
105} 143}
106 144
107// undefined external reference to catch people using strcmp when they shouldn't
108int strcmp (const shstr_tmp &a, const shstr_tmp &b);
109
110static std::ostream &operator <<(std::ostream &o, shstr_tmp sh) 145static inline std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
111{ 146{
112 o.write (sh.s, sh.length ()); 147 o.write (sh.s, sh.length ());
113 148
114 return o; 149 return o;
115} 150}
… …
146 { 181 {
147 ++refcnt (); 182 ++refcnt ();
148 } 183 }
149 184
150 explicit shstr (const char *str) 185 explicit shstr (const char *str)
151 {
152 s = is_constant (str) && !str ? null : intern (str); 186 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
187 {
153 } 188 }
154 189
155 ~shstr () 190 ~shstr ()
156 { 191 {
157 --refcnt (); 192 --refcnt ();
… …
178 213
179 // shstr_tmp doesn't have this one 214 // shstr_tmp doesn't have this one
180 shstr &operator =(const char *str) 215 shstr &operator =(const char *str)
181 { 216 {
182 --refcnt (); 217 --refcnt ();
183 s = is_constant (str) && !str ? null : intern (str); 218 s = is_constant (str) && !str ? null () : intern (str);
184 219
185 return *this; 220 return *this;
186 } 221 }
187}; 222};
188 223
… …
190// temporary passing, basically a non-refcounted shstr 225// temporary passing, basically a non-refcounted shstr
191struct shstr_cmp 226struct shstr_cmp
192{ 227{
193 const char *s; 228 const char *s;
194 229
230 // initialies to the non-matching string (as opposed to the null string)
231 shstr_cmp ()
232 {
233 s = 0;
234 }
235
195 explicit shstr_cmp (const char *str) 236 shstr_cmp (const char *str)
196 : s (shstr::find (str)) 237 : s (shstr::find (str))
197 { 238 {
198 } 239 }
199 240
200 shstr_cmp (const shstr_cmp &sh) 241 shstr_cmp (shstr_tmp sh)
201 : s (sh.s)
202 {
203 }
204
205 shstr_cmp (const shstr &sh)
206 : s (sh.s) 242 : s (sh.s)
207 { 243 {
208 } 244 }
209 245
210 // this is used for informational messages and the like 246 // this is used for informational messages and the like
211 const char *operator &() const { return s; } 247 const char *operator &() const { return s; }
212 248
213 shstr_cmp operator =(const shstr_cmp sh) { s = sh.s; return *this; }
214 operator const char *() const { return s; } 249 operator const char *() const { return s; }
215}; 250};
216 251
217inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b) 252inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
218{ 253{
… …
222inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b) 257inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
223{ 258{
224 return a.s == b.s; 259 return a.s == b.s;
225} 260}
226 261
227extern const shstr shstr_null;
228
229#define def(str) extern const shstr shstr_ ## str; 262#define def2(id,str) extern const shstr id;
263#define def(id) def2(shstr_ ## id, # id)
230# include "shstrinc.h" 264# include "shstrinc.h"
231#undef def 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);
232 271
233#endif 272#endif
234 273

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