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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.16 by root, Mon May 28 21:15:56 2007 UTC vs.
Revision 1.30 by root, Thu Jan 1 16:05:12 2009 UTC

1/* 1/*
2 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team 4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 5 *
6 * Crossfire TRT is free software; you can redistribute it and/or modify it 6 * Deliantra is free software: you can redistribute it and/or modify
7 * under the terms of the GNU General Public License as published by the Free 7 * it under the terms of the GNU General Public License as published by
8 * Software Foundation; either version 2 of the License, or (at your option) 8 * the Free Software Foundation, either version 3 of the License, or
9 * any later version. 9 * (at your option) any later version.
10 * 10 *
11 * This program is distributed in the hope that it will be useful, but 11 * This program is distributed in the hope that it will be useful,
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * 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 along 16 * You should have received a copy of the GNU General Public License
17 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 * 18 *
20 * The authors can be reached via e-mail to <crossfire@schmorp.de> 19 * The authors can be reached via e-mail to <support@deliantra.net>
21 */ 20 */
22 21
23#ifndef SHSTR_H__ 22#ifndef SHSTR_H__
24#define SHSTR_H__ 23#define SHSTR_H__
25 24
25#include <cstring>
26#include <sstream> 26#include <sstream>
27 27
28#include "util.h" 28#include "traits.h"
29
30extern size_t shstr_alloc;
29 31
30extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
31 33
34template<int size>
32struct shstr 35struct shstr_vec
33{ 36{
34 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
35 51
36 const char *s; 52 const char *s;
37 53
38 static int &refcnt (const char *s)
39 {
40 return *((int *)s - 1);
41 }
42
43 static int &length (const char *s) 54 static unsigned int &length (const char *s)
44 { 55 {
45 return *((int *)s - 2); 56 return *((unsigned int *)s - 2);
46 } 57 }
47 58
48 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 bool contains (const char *substring) const
74 {
75 return s != null () && strstr (s, substring);
76 }
77
78 //TODO: case sensitive should be eradicated
79 bool eq_nc (const char *otherstring) const
80 {
81 return !strcasecmp (s, otherstring);
82 }
83
84 shstr_tmp ()
85 : s (null ())
86 {
87 }
88
89 shstr_tmp (const shstr_tmp &sh)
90 : s (sh.s)
91 {
92 }
93
94 shstr_tmp operator =(const shstr_tmp &sh)
95 {
96 s = sh.s;
97
98 return *this;
99 }
100
101 // this is used for informational messages and the like
102 const char *operator &() const { return s; }
103
104 operator const char *() const { return s == null () ? 0 : s; }
105
106protected:
107 // dummy is there so it isn't used as type converter accidentally
108 shstr_tmp (int dummy, const char *s)
109 : s(s)
110 {
111 }
112};
113
114inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
115{
116 return a.s == b.s;
117}
118
119inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
120{
121 return a.s != b.s;
122}
123
124inline int strlen (const shstr_tmp &sh)
125{
126 return sh.length ();
127}
128
129static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
130{
131 o.write (sh.s, sh.length ());
132
133 return o;
134}
135
136struct shstr : shstr_tmp
137{
138 static unsigned int &refcnt (const char *s)
139 {
140 return *((unsigned int *)s - 1);
141 }
142
143 unsigned int &refcnt () const
49 { 144 {
50 return refcnt (s); 145 return refcnt (s);
51 } 146 }
52 147
53 int length () const 148 shstr ()
54 { 149 {
55 return length (s);
56 }
57
58 // returns wether this shared string begins with the given prefix,
59 // used mainly for searched when users give only the start of a name.
60 bool begins_with (const char *prefix) const
61 {
62 int plen = strlen (prefix);
63 return !strncasecmp (s, prefix, plen) && length () >= plen;
64 } 150 }
65 151
66 static const char *find (const char *s); 152 static const char *find (const char *s);
67 static const char *intern (const char *s); 153 static const char *intern (const char *s);
68 154
69 static void gc (); // garbage collect a few strings 155 static void gc (); // garbage collect a few strings
70 156
71 // this is used for informational messages and the like
72 const char *operator &() const { return s; }
73
74 const char &operator [](int i) const { return s[i]; }
75 operator const char *() const { return s == null ? 0 : s; }
76
77 shstr ()
78 : s (null)
79 {
80 }
81
82 shstr (const shstr &sh) 157 shstr (const shstr &sh)
83 : s (sh.s) 158 : shstr_tmp (sh)
84 { 159 {
85 ++refcnt (); 160 ++refcnt ();
86 } 161 }
87 162
163 shstr (const shstr_tmp &sh)
164 : shstr_tmp (sh)
165 {
166 ++refcnt ();
167 }
168
88 explicit shstr (const char *s) 169 explicit shstr (const char *str)
89 : s (intern (s)) 170 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
90 { 171 {
91 } 172 }
92 173
93 ~shstr () 174 ~shstr ()
94 { 175 {
95 --refcnt (); 176 --refcnt ();
96 } 177 }
97 178
179 using shstr_tmp::operator &;
180 using shstr_tmp::operator const char *;
181
182 // (note: not the copy constructor)
98 const shstr &operator =(const shstr &sh) 183 shstr &operator =(const shstr_tmp &sh)
99 { 184 {
100 --refcnt (); 185 --refcnt ();
101 s = sh.s; 186 s = sh.s;
102 ++refcnt (); 187 ++refcnt ();
103 188
104 return *this; 189 return *this;
105 } 190 }
106 191
192 // here it comes
193 shstr &operator =(const shstr &sh)
194 {
195 return (*this) = (shstr_tmp)sh;
196 }
197
198 // shstr_tmp doesn't have this one
107 const shstr &operator =(const char *str) 199 shstr &operator =(const char *str)
108 { 200 {
109 --refcnt (); 201 --refcnt ();
110 202 s = is_constant (str) && !str ? null () : intern (str);
111 // this optimises the important case of str == constant 0
112 if (is_constant (str))
113 s = str ? intern (str) : null;
114 else
115 s = intern (str);
116 203
117 return *this; 204 return *this;
118 } 205 }
206};
119 207
120 bool operator ==(const shstr &b) 208// only good for mass comparisons to shstr objects, or very
209// temporary passing, basically a non-refcounted shstr
210struct shstr_cmp
211{
212 const char *s;
213
214 // initialies to the non-matching string (as opposed to the null string)
215 shstr_cmp ()
121 { 216 {
217 s = 0;
218 }
219
220 shstr_cmp (const char *str)
221 : s (shstr::find (str))
222 {
223 }
224
225 shstr_cmp (shstr_tmp sh)
226 : s (sh.s)
227 {
228 }
229
230 // this is used for informational messages and the like
231 const char *operator &() const { return s; }
232
233 operator const char *() const { return s; }
234};
235
236inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
237{
122 return s == b.s; 238 return a.s == b.s;
123 }
124
125 bool operator !=(const shstr &b)
126 {
127 return !(*this == b);
128 }
129};
130
131inline int strlen (const shstr &sh)
132{
133 return sh.length ();
134} 239}
135 240
136inline int strcmp (const shstr &a, const shstr &b) 241inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
137{ 242{
138 // TODO: use this to find all the occurences of people using strcmp 243 return a.s == b.s;
139 // all uses should be bogus, as we should be never interested in 244}
140 // comparing shstr's alphabetically 245
141#if 0 246#define def2(id,str) extern const shstr id;
142 extern void do_not_use_strcmp_to_compare_shstr_values (); 247#define def(id) def2(shstr_ ## id, # id)
143 do_not_use_strcmp_to_compare_shstr_values (); 248# include "shstrinc.h"
249#undef def
250#undef def2
251
252// undefined external reference to catch people using str* functions when they shouldn't
253//template<class any> void strcmp (const shstr_tmp &a, any b);
254template<class any> void strstr (const shstr_tmp &a, any b);
255
144#endif 256#endif
145 return a != b;
146}
147 257
148static std::ostream &operator <<(std::ostream &o, const shstr &sh)
149{
150 o.write (sh.s, sh.length ());
151 return o;
152}
153
154// only good for mass comparisons to shstr objects
155struct shstr_cmp
156{
157 const char *s;
158
159 explicit shstr_cmp (const char *s)
160 : s (shstr::find (s))
161 {
162 }
163
164 shstr_cmp (const shstr_cmp &sh)
165 : s (sh.s)
166 {
167 }
168
169 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; }
170 operator const char *() const { return s; }
171};
172
173inline bool operator ==(const shstr_cmp &a, const shstr &b)
174{
175 return a.s == b.s;
176}
177
178inline bool operator ==(const shstr &a, const shstr_cmp &b)
179{
180 return b == a;
181}
182
183extern const shstr undead_name; /* Used in hit_player() in main.c */
184
185#endif
186

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