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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.13 by root, Mon Apr 23 15:27:46 2007 UTC vs.
Revision 1.24 by root, Wed Dec 31 17:35:37 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 "util.h"
7 29
30extern size_t shstr_alloc;
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
34// this class is a non-refcounted shared string
35// 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
37// 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.
10struct shstr 39struct shstr_tmp
11{ 40{
12 static const char *null; 41 static const char *null;
13 42
14 const char *s; 43 const char *s;
15 44
16 static int &refcnt (const char *s)
17 {
18 return *((int *)s - 1);
19 }
20
21 static int &length (const char *s) 45 static unsigned int &length (const char *s)
22 { 46 {
23 return *((int *)s - 2); 47 return *((unsigned int *)s - 2);
24 } 48 }
25 49
26 int &refcnt () const 50 int length () const
51 {
52 return length (s);
53 }
54
55 // returns whether this shared string begins with the given prefix,
56 // used mainly for searches when users give only the start of a name.
57 bool starts_with (const char *prefix) const
58 {
59 int plen = strlen (prefix);
60
61 return length () >= plen && !strncasecmp (s, prefix, plen);
62 }
63
64 bool contains (const char *substring) const
65 {
66 return strstr (s, substring);
67 }
68
69 shstr_tmp ()
70 : s (null)
71 {
72 }
73
74 shstr_tmp (const shstr_tmp &sh)
75 : s (sh.s)
76 {
77 }
78
79 shstr_tmp operator =(const shstr_tmp &sh)
80 {
81 s = sh.s;
82
83 return *this;
84 }
85
86 // this is used for informational messages and the like
87 const char *operator &() const { return s; }
88
89 operator const char *() const { return s == null ? 0 : s; }
90};
91
92inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
93{
94 return a.s == b.s;
95}
96
97inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
98{
99 return a.s != b.s;
100}
101
102inline int strlen (const shstr_tmp &sh)
103{
104 return sh.length ();
105}
106
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)
111{
112 o.write (sh.s, sh.length ());
113
114 return o;
115}
116
117struct shstr : shstr_tmp
118{
119 static unsigned int &refcnt (const char *s)
120 {
121 return *((unsigned int *)s - 1);
122 }
123
124 unsigned int &refcnt () const
27 { 125 {
28 return refcnt (s); 126 return refcnt (s);
29 } 127 }
30 128
31 int length () const 129 shstr ()
32 { 130 {
33 return length (s);
34 } 131 }
35 132
36 static const char *find (const char *s); 133 static const char *find (const char *s);
37 static const char *intern (const char *s); 134 static const char *intern (const char *s);
38 135
39 static void gc (); // garbage collect a few strings 136 static void gc (); // garbage collect a few strings
40 137
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) 138 shstr (const shstr &sh)
53 : s (sh.s) 139 : shstr_tmp (sh)
54 { 140 {
55 ++refcnt (); 141 ++refcnt ();
56 } 142 }
57 143
144 shstr (const shstr_tmp &sh)
145 : shstr_tmp (sh)
146 {
147 ++refcnt ();
148 }
149
58 explicit shstr (const char *s) 150 explicit shstr (const char *str)
59 : s (intern (s))
60 { 151 {
152 s = is_constant (str) && !str ? null : intern (str);
61 } 153 }
62 154
63 ~shstr () 155 ~shstr ()
64 { 156 {
65 --refcnt (); 157 --refcnt ();
66 } 158 }
67 159
160 using shstr_tmp::operator &;
161 using shstr_tmp::operator const char *;
162
163 // (note: not the copy constructor)
68 const shstr &operator =(const shstr &sh) 164 shstr &operator =(const shstr_tmp &sh)
69 { 165 {
70 --refcnt (); 166 --refcnt ();
71 s = sh.s; 167 s = sh.s;
72 ++refcnt (); 168 ++refcnt ();
73 169
74 return *this; 170 return *this;
75 } 171 }
76 172
173 // here it comes
174 shstr &operator =(const shstr &sh)
175 {
176 return (*this) = (shstr_tmp)sh;
177 }
178
179 // shstr_tmp doesn't have this one
77 const shstr &operator =(const char *str) 180 shstr &operator =(const char *str)
78 { 181 {
79 --refcnt (); 182 --refcnt ();
80 183 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);
86 184
87 return *this; 185 return *this;
88 } 186 }
89
90 bool operator ==(const shstr &b)
91 {
92 return s == b.s;
93 }
94
95 bool operator !=(const shstr &b)
96 {
97 return !(*this == b);
98 }
99}; 187};
100 188
101inline int strlen (const shstr &sh)
102{
103 return sh.length ();
104}
105
106inline int strcmp (const shstr &a, const shstr &b)
107{
108 // TODO: use this to find all the occurences of people using strcmp
109 // all uses should be bogus, as we should be never interested in
110 // comparing shstr's alphabetically
111#if 0
112 extern void do_not_use_strcmp_to_compare_shstr_values ();
113 do_not_use_strcmp_to_compare_shstr_values ();
114#endif
115 return a != b;
116}
117
118std::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 189// only good for mass comparisons to shstr objects, or very
190// temporary passing, basically a non-refcounted shstr
125struct shstr_cmp 191struct shstr_cmp
126{ 192{
127 const char *s; 193 const char *s;
128 194
129 explicit shstr_cmp (const char *s) 195 explicit shstr_cmp (const char *str)
130 : s (shstr::find (s)) 196 : s (shstr::find (str))
131 { 197 {
132 } 198 }
133 199
134 shstr_cmp (const shstr_cmp &sh) 200 shstr_cmp (const shstr_cmp &sh)
135 : s (sh.s) 201 : s (sh.s)
136 { 202 {
137 } 203 }
138 204
205 shstr_cmp (const shstr &sh)
206 : s (sh.s)
207 {
208 }
209
210 // this is used for informational messages and the like
211 const char *operator &() const { return s; }
212
139 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } 213 shstr_cmp operator =(const shstr_cmp sh) { s = sh.s; return *this; }
140 operator const char *() const { return s; } 214 operator const char *() const { return s; }
141}; 215};
142 216
143inline bool operator ==(const shstr_cmp &a, const shstr &b) 217inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
144{ 218{
145 return a.s == b.s; 219 return a.s == b.s;
146} 220}
147 221
148inline bool operator ==(const shstr &a, const shstr_cmp &b) 222inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
149{ 223{
150 return b == a; 224 return a.s == b.s;
151} 225}
152 226
153extern const shstr undead_name; /* Used in hit_player() in main.c */ 227extern const shstr shstr_null;
228
229#define def(str) extern const shstr shstr_ ## str;
230# include "shstrinc.h"
231#undef def
154 232
155#endif 233#endif
156 234

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