ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/deliantra/server/include/shstr.h
(Generate patch)

Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.15 by root, Mon May 14 21:52:32 2007 UTC vs.
Revision 1.25 by root, Wed Dec 31 18:07:41 2008 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 *
6 * Deliantra is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your 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 GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 *
19 * The authors can be reached via e-mail to <support@deliantra.net>
20 */
21
1#ifndef SHSTR_H__ 22#ifndef SHSTR_H__
2#define SHSTR_H__ 23#define SHSTR_H__
3 24
25#include <cstring>
4#include <sstream> 26#include <sstream>
5 27
6#include "util.h" 28#include "traits.h"
29
30extern size_t shstr_alloc;
7 31
8extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
9 33
34template<int size>
10struct shstr 35struct shstr_vec
11{ 36{
12 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
13 51
14 const char *s; 52 const char *s;
15 53
16 static int &refcnt (const char *s)
17 {
18 return *((int *)s - 1);
19 }
20
21 static int &length (const char *s) 54 static unsigned int &length (const char *s)
22 { 55 {
23 return *((int *)s - 2); 56 return *((unsigned int *)s - 2);
24 } 57 }
25 58
26 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 strstr (s, substring);
76 }
77
78 shstr_tmp ()
79 : s (null ())
80 {
81 }
82
83 shstr_tmp (const shstr_tmp &sh)
84 : s (sh.s)
85 {
86 }
87
88 shstr_tmp operator =(const shstr_tmp &sh)
89 {
90 s = sh.s;
91
92 return *this;
93 }
94
95 // this is used for informational messages and the like
96 const char *operator &() const { return s; }
97
98 operator const char *() const { return s == null () ? 0 : s; }
99};
100
101inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
102{
103 return a.s == b.s;
104}
105
106inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
107{
108 return a.s != b.s;
109}
110
111inline int strlen (const shstr_tmp &sh)
112{
113 return sh.length ();
114}
115
116// undefined external reference to catch people using strcmp when they shouldn't
117int strcmp (const shstr_tmp &a, const shstr_tmp &b);
118
119static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
120{
121 o.write (sh.s, sh.length ());
122
123 return o;
124}
125
126struct shstr : shstr_tmp
127{
128 static unsigned int &refcnt (const char *s)
129 {
130 return *((unsigned int *)s - 1);
131 }
132
133 unsigned int &refcnt () const
27 { 134 {
28 return refcnt (s); 135 return refcnt (s);
29 } 136 }
30 137
31 int length () const 138 shstr ()
32 { 139 {
33 return length (s);
34 }
35
36 // returns wether this shared string begins with the given prefix,
37 // used mainly for searched when users give only the start of a name.
38 bool begins_with (const char *prefix) const
39 {
40 int plen = strlen (prefix);
41 return !strncasecmp (s, prefix, plen) && length () >= plen;
42 } 140 }
43 141
44 static const char *find (const char *s); 142 static const char *find (const char *s);
45 static const char *intern (const char *s); 143 static const char *intern (const char *s);
46 144
47 static void gc (); // garbage collect a few strings 145 static void gc (); // garbage collect a few strings
48 146
49 // this is used for informational messages and the like
50 const char *operator &() const { return s; }
51
52 const char &operator [](int i) const { return s[i]; }
53 operator const char *() const { return s == null ? 0 : s; }
54
55 shstr ()
56 : s (null)
57 {
58 }
59
60 shstr (const shstr &sh) 147 shstr (const shstr &sh)
61 : s (sh.s) 148 : shstr_tmp (sh)
62 { 149 {
63 ++refcnt (); 150 ++refcnt ();
64 } 151 }
65 152
153 shstr (const shstr_tmp &sh)
154 : shstr_tmp (sh)
155 {
156 ++refcnt ();
157 }
158
66 explicit shstr (const char *s) 159 explicit shstr (const char *str)
67 : s (intern (s))
68 { 160 {
161 s = is_constant (str) && !str ? null () : intern (str);
69 } 162 }
70 163
71 ~shstr () 164 ~shstr ()
72 { 165 {
73 --refcnt (); 166 --refcnt ();
74 } 167 }
75 168
169 using shstr_tmp::operator &;
170 using shstr_tmp::operator const char *;
171
172 // (note: not the copy constructor)
76 const shstr &operator =(const shstr &sh) 173 shstr &operator =(const shstr_tmp &sh)
77 { 174 {
78 --refcnt (); 175 --refcnt ();
79 s = sh.s; 176 s = sh.s;
80 ++refcnt (); 177 ++refcnt ();
81 178
82 return *this; 179 return *this;
83 } 180 }
84 181
182 // here it comes
183 shstr &operator =(const shstr &sh)
184 {
185 return (*this) = (shstr_tmp)sh;
186 }
187
188 // shstr_tmp doesn't have this one
85 const shstr &operator =(const char *str) 189 shstr &operator =(const char *str)
86 { 190 {
87 --refcnt (); 191 --refcnt ();
88 192 s = is_constant (str) && !str ? null () : intern (str);
89 // this optimises the important case of str == constant 0
90 if (is_constant (str))
91 s = str ? intern (str) : null;
92 else
93 s = intern (str);
94 193
95 return *this; 194 return *this;
96 } 195 }
196};
97 197
98 bool operator ==(const shstr &b) 198// only good for mass comparisons to shstr objects, or very
199// temporary passing, basically a non-refcounted shstr
200struct shstr_cmp
201{
202 const char *s;
203
204 explicit shstr_cmp (const char *str)
205 : s (shstr::find (str))
99 { 206 {
207 }
208
209 shstr_cmp (shstr_tmp sh)
210 : s (sh.s)
211 {
212 }
213
214 // this is used for informational messages and the like
215 const char *operator &() const { return s; }
216
217 operator const char *() const { return s; }
218};
219
220inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
221{
100 return s == b.s; 222 return a.s == b.s;
101 }
102
103 bool operator !=(const shstr &b)
104 {
105 return !(*this == b);
106 }
107};
108
109inline int strlen (const shstr &sh)
110{
111 return sh.length ();
112} 223}
113 224
114inline int strcmp (const shstr &a, const shstr &b) 225inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
115{ 226{
116 // TODO: use this to find all the occurences of people using strcmp 227 return a.s == b.s;
117 // all uses should be bogus, as we should be never interested in 228}
118 // comparing shstr's alphabetically 229
119#if 0 230#define def(str) extern const shstr shstr_ ## str;
120 extern void do_not_use_strcmp_to_compare_shstr_values (); 231# include "shstrinc.h"
121 do_not_use_strcmp_to_compare_shstr_values (); 232#undef def
233
122#endif 234#endif
123 return a != b;
124}
125 235
126static std::ostream &operator <<(std::ostream &o, const shstr &sh)
127{
128 o.write (sh.s, sh.length ());
129 return o;
130}
131
132// only good for mass comparisons to shstr objects
133struct shstr_cmp
134{
135 const char *s;
136
137 explicit shstr_cmp (const char *s)
138 : s (shstr::find (s))
139 {
140 }
141
142 shstr_cmp (const shstr_cmp &sh)
143 : s (sh.s)
144 {
145 }
146
147 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; }
148 operator const char *() const { return s; }
149};
150
151inline bool operator ==(const shstr_cmp &a, const shstr &b)
152{
153 return a.s == b.s;
154}
155
156inline bool operator ==(const shstr &a, const shstr_cmp &b)
157{
158 return b == a;
159}
160
161extern const shstr undead_name; /* Used in hit_player() in main.c */
162
163#endif
164

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines