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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.11 by root, Thu Sep 14 21:16:12 2006 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>
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 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
11 52
12 const char *s; 53 const char *s;
13 54
14 static int &refcnt (const char *s)
15 {
16 return *((int *)s - 1);
17 }
18
19 static int &length (const char *s) 55 static unsigned int &length (const char *s)
20 { 56 {
21 return *((int *)s - 2); 57 return *((unsigned int *)s - 2);
22 } 58 }
23 59
24 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
25 { 148 {
26 return refcnt (s); 149 return refcnt (s);
27 } 150 }
28 151
29 int length () const 152 shstr ()
30 { 153 {
31 return length (s);
32 } 154 }
33 155
34 static const char *find (const char *s); 156 static const char *find (const char *s);
35 static const char *intern (const char *s); 157 static const char *intern (const char *s);
36 158
37 static void gc (); // garbage collect a few strings 159 static void gc (); // garbage collect a few strings
38 160
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) 161 shstr (const shstr &sh)
51 : s (sh.s) 162 : shstr_tmp (sh)
52 { 163 {
53 ++refcnt (); 164 ++refcnt ();
54 } 165 }
55 166
167 shstr (const shstr_tmp &sh)
168 : shstr_tmp (sh)
169 {
170 ++refcnt ();
171 }
172
56 explicit shstr (const char *s) 173 explicit shstr (const char *str)
57 : s (intern (s)) 174 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
58 { 175 {
59 } 176 }
60 177
61 ~shstr () 178 ~shstr ()
62 { 179 {
63 --refcnt (); 180 --refcnt ();
64 } 181 }
65 182
183 using shstr_tmp::operator &;
184 using shstr_tmp::operator const char *;
185
186 // (note: not the copy constructor)
66 const shstr &operator =(const shstr &sh) 187 shstr &operator =(const shstr_tmp &sh)
67 { 188 {
68 --refcnt (); 189 --refcnt ();
69 s = sh.s; 190 s = sh.s;
70 ++refcnt (); 191 ++refcnt ();
71 192
72 return *this; 193 return *this;
73 } 194 }
74 195
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
75 const shstr &operator =(const char *str) 203 shstr &operator =(const char *str)
76 { 204 {
77 --refcnt (); 205 --refcnt ();
78 206 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);
84 207
85 return *this; 208 return *this;
86 } 209 }
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}; 210};
98 211
99inline int strlen (const shstr &sh)
100{
101 return sh.length ();
102}
103
104// only good for mass comparisons to shstr objects 212// only good for mass comparisons to shstr objects, or very
213// temporary passing, basically a non-refcounted shstr
105struct shstr_cmp 214struct shstr_cmp
106{ 215{
107 const char *s; 216 const char *s;
108 217
218 // initialies to the non-matching string (as opposed to the null string)
219 shstr_cmp ()
220 {
221 s = 0;
222 }
223
109 explicit shstr_cmp (const char *s) 224 shstr_cmp (const char *str)
110 : s (shstr::find (s)) 225 : s (shstr::find (str))
111 { 226 {
112 } 227 }
113 228
114 shstr_cmp (const shstr_cmp &sh) 229 shstr_cmp (shstr_tmp sh)
115 : s (sh.s) 230 : s (sh.s)
116 { 231 {
117 } 232 }
118 233
119 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } 234 // this is used for informational messages and the like
235 const char *operator &() const { return s; }
236
120 operator const char *() const { return s; } 237 operator const char *() const { return s; }
121}; 238};
122 239
123inline bool operator ==(const shstr_cmp &a, const shstr &b) 240inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
124{ 241{
125 return a.s == b.s; 242 return a.s == b.s;
126} 243}
127 244
128inline bool operator ==(const shstr &a, const shstr_cmp &b) 245inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
129{ 246{
130 return b == a; 247 return a.s == b.s;
131} 248}
132 249
133extern const shstr undead_name; /* Used in hit_player() in main.c */ 250#define def2(id,str) extern const shstr id;
251#define def(id) def2(shstr_ ## id, # id)
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);
134 259
135#endif 260#endif
136 261

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