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 1.14 by root, Mon Apr 23 16:07:00 2007 UTC vs.
Revision 1.33 by root, Mon Oct 12 14:00:58 2009 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 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>
4#include <sstream> 27#include <sstream>
5 28
6#include "util.h" 29#include "traits.h"
30
31extern size_t shstr_alloc;
7 32
8extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 33extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
9 34
35template<int size>
10struct shstr 36struct shstr_vec
11{ 37{
12 static const char *null; 38 uint32_t len;
39 uint32_t refcnt;
40 char string[size];
41};
42
43// this class is a non-refcounted shared string
44// it cannot be used to create or store shared strings, but
45// it can be used to apss shared strings around, i.e. as function arguments
46// or return values. their lifetime must not span a gc () call, i.e.
47// they are only valid as temporary values within the same server tick.
48struct shstr_tmp
49{
50 static shstr_vec<sizeof ("(null)")> nullvec;
51 static const char *null () { return nullvec.string; } // this is the null pointer value
13 52
14 const char *s; 53 const char *s;
15 54
16 static int &refcnt (const char *s)
17 {
18 return *((int *)s - 1);
19 }
20
21 static int &length (const char *s) 55 static unsigned int &length (const char *s)
22 { 56 {
23 return *((int *)s - 2); 57 return *((unsigned int *)s - 2);
24 } 58 }
25 59
26 int &refcnt () const 60 int length () const
61 {
62 return length (s);
63 }
64
65 // returns whether this shared string begins with the given prefix,
66 // used mainly for searches when users give only the start of a name.
67 bool starts_with (const char *prefix) const
68 {
69 int plen = strlen (prefix);
70
71 return length () >= plen && !strncasecmp (s, prefix, plen);
72 }
73
74 // returns true if the substring is contained in the shstr
75 // if the shstr is 0, then this always returns false.
76 // the shstr is (theoretically) treated as a comma/colon/space etc. separated list.
77 bool contains (const char *substring) const
78 {
79 return s != null () && strstr (s, substring);
80 }
81
82 //TODO: case sensitive should be eradicated
83 bool eq_nc (const char *otherstring) const
84 {
85 return !strcasecmp (s, otherstring);
86 }
87
88 shstr_tmp ()
89 : s (null ())
90 {
91 }
92
93 shstr_tmp (const shstr_tmp &sh)
94 : s (sh.s)
95 {
96 }
97
98 shstr_tmp operator =(const shstr_tmp &sh)
99 {
100 s = sh.s;
101
102 return *this;
103 }
104
105 // this is used for informational messages and the like
106 const char *operator &() const { return s; }
107
108 operator const char *() const { return s == null () ? 0 : s; }
109
110protected:
111 // dummy is there so it isn't used as type converter accidentally
112 shstr_tmp (int dummy, const char *s)
113 : s(s)
114 {
115 }
116};
117
118inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
119{
120 return a.s == b.s;
121}
122
123inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
124{
125 return a.s != b.s;
126}
127
128inline int strlen (shstr_tmp sh)
129{
130 return sh.length ();
131}
132
133static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
134{
135 o.write (sh.s, sh.length ());
136
137 return o;
138}
139
140struct shstr : shstr_tmp
141{
142 static unsigned int &refcnt (const char *s)
143 {
144 return *((unsigned int *)s - 1);
145 }
146
147 unsigned int &refcnt () const
27 { 148 {
28 return refcnt (s); 149 return refcnt (s);
29 } 150 }
30 151
31 int length () const 152 shstr ()
32 { 153 {
33 return length (s);
34 } 154 }
35 155
36 static const char *find (const char *s); 156 static const char *find (const char *s);
37 static const char *intern (const char *s); 157 static const char *intern (const char *s);
38 158
39 static void gc (); // garbage collect a few strings 159 static void gc (); // garbage collect a few strings
40 160
41 // this is used for informational messages and the like
42 const char *operator &() const { return s; }
43
44 const char &operator [](int i) const { return s[i]; }
45 operator const char *() const { return s == null ? 0 : s; }
46
47 shstr ()
48 : s (null)
49 {
50 }
51
52 shstr (const shstr &sh) 161 shstr (const shstr &sh)
53 : s (sh.s) 162 : shstr_tmp (sh)
54 { 163 {
55 ++refcnt (); 164 ++refcnt ();
56 } 165 }
57 166
167 shstr (const shstr_tmp &sh)
168 : shstr_tmp (sh)
169 {
170 ++refcnt ();
171 }
172
58 explicit shstr (const char *s) 173 explicit shstr (const char *str)
59 : s (intern (s)) 174 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
60 { 175 {
61 } 176 }
62 177
63 ~shstr () 178 ~shstr ()
64 { 179 {
65 --refcnt (); 180 --refcnt ();
66 } 181 }
67 182
183 using shstr_tmp::operator &;
184 using shstr_tmp::operator const char *;
185
186 // (note: not the copy constructor)
68 const shstr &operator =(const shstr &sh) 187 shstr &operator =(const shstr_tmp &sh)
69 { 188 {
70 --refcnt (); 189 --refcnt ();
71 s = sh.s; 190 s = sh.s;
72 ++refcnt (); 191 ++refcnt ();
73 192
74 return *this; 193 return *this;
75 } 194 }
76 195
196 // here it comes
197 shstr &operator =(const shstr &sh)
198 {
199 return (*this) = (shstr_tmp)sh;
200 }
201
202 // shstr_tmp doesn't have this one
77 const shstr &operator =(const char *str) 203 shstr &operator =(const char *str)
78 { 204 {
79 --refcnt (); 205 --refcnt ();
80 206 s = is_constant (str) && !str ? null () : intern (str);
81 // this optimises the important case of str == constant 0
82 if (is_constant (str))
83 s = str ? intern (str) : null;
84 else
85 s = intern (str);
86 207
87 return *this; 208 return *this;
88 } 209 }
210};
89 211
90 bool operator ==(const shstr &b) 212// only good for mass comparisons to shstr objects, or very
213// temporary passing, basically a non-refcounted shstr
214struct shstr_cmp
215{
216 const char *s;
217
218 // initialies to the non-matching string (as opposed to the null string)
219 shstr_cmp ()
91 { 220 {
221 s = 0;
222 }
223
224 shstr_cmp (const char *str)
225 : s (shstr::find (str))
226 {
227 }
228
229 shstr_cmp (shstr_tmp sh)
230 : s (sh.s)
231 {
232 }
233
234 // this is used for informational messages and the like
235 const char *operator &() const { return s; }
236
237 operator const char *() const { return s; }
238};
239
240inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
241{
92 return s == b.s; 242 return a.s == b.s;
93 }
94
95 bool operator !=(const shstr &b)
96 {
97 return !(*this == b);
98 }
99};
100
101inline int strlen (const shstr &sh)
102{
103 return sh.length ();
104} 243}
105 244
106inline int strcmp (const shstr &a, const shstr &b) 245inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
107{ 246{
108 // TODO: use this to find all the occurences of people using strcmp 247 return a.s == b.s;
109 // all uses should be bogus, as we should be never interested in 248}
110 // comparing shstr's alphabetically 249
111#if 0 250#define def2(id,str) extern const shstr id;
112 extern void do_not_use_strcmp_to_compare_shstr_values (); 251#define def(id) def2(shstr_ ## id, # id)
113 do_not_use_strcmp_to_compare_shstr_values (); 252# include "shstrinc.h"
253#undef def
254#undef def2
255
256// undefined external reference to catch people using str* functions when they shouldn't
257//template<class any> void strcmp (const shstr_tmp &a, any b);
258template<class any> void strstr (const shstr_tmp &a, any b);
259
114#endif 260#endif
115 return a != b;
116}
117 261
118static std::ostream &operator <<(std::ostream &o, const shstr &sh)
119{
120 o.write (sh.s, sh.length ());
121 return o;
122}
123
124// only good for mass comparisons to shstr objects
125struct shstr_cmp
126{
127 const char *s;
128
129 explicit shstr_cmp (const char *s)
130 : s (shstr::find (s))
131 {
132 }
133
134 shstr_cmp (const shstr_cmp &sh)
135 : s (sh.s)
136 {
137 }
138
139 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; }
140 operator const char *() const { return s; }
141};
142
143inline bool operator ==(const shstr_cmp &a, const shstr &b)
144{
145 return a.s == b.s;
146}
147
148inline bool operator ==(const shstr &a, const shstr_cmp &b)
149{
150 return b == a;
151}
152
153extern const shstr undead_name; /* Used in hit_player() in main.c */
154
155#endif
156

Diff Legend

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