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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.7 by root, Sun Sep 3 09:00:09 2006 UTC vs.
Revision 1.21 by root, Sat May 3 11:14:50 2008 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007 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 <sstream>
26
27#include "util.h"
28
29extern size_t shstr_alloc;
30
4extern int buf_overflow(const char *buf1, const char *buf2, int bufsize); 31extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
5 32
6struct shstr 33struct shstr
7{ 34{
35 static const char *null;
36
8 const char *s; 37 const char *s;
9 38
10 static int &refcnt (const char *s) 39 static int &refcnt (const char *s)
11 { 40 {
12 return *((int *)s - 1); 41 return *((int *)s - 1);
… …
22 return refcnt (s); 51 return refcnt (s);
23 } 52 }
24 53
25 int length () const 54 int length () const
26 { 55 {
27 return s ? length (s) : 0; 56 return length (s);
57 }
58
59 // returns wether this shared string begins with the given prefix,
60 // used mainly for searched when users give only the start of a name.
61 bool begins_with (const char *prefix) const
62 {
63 int plen = strlen (prefix);
64 return !strncasecmp (s, prefix, plen) && length () >= plen;
28 } 65 }
29 66
30 static const char *find (const char *s); 67 static const char *find (const char *s);
31 static const char *intern (const char *s); 68 static const char *intern (const char *s);
32 69
33 static void gc (); // garbage collect a few strings 70 static void gc (); // garbage collect a few strings
34 71
35 // this is used for informational messages and the like 72 // this is used for informational messages and the like
36 const char *operator &() const { return s ? s : "<nil>"; } 73 const char *operator &() const { return s; }
37 74
38 const char &operator [](int i) const { return s[i]; } 75 const char &operator [](int i) const { return s[i]; }
39 operator const char *() const { return s; } 76 operator const char *() const { return s == null ? 0 : s; }
40 77
41 shstr () 78 shstr ()
42 : s (0) 79 : s (null)
43 { 80 {
44 } 81 }
45 82
46 shstr (const shstr &sh) 83 shstr (const shstr &sh)
47 : s (sh.s) 84 : s (sh.s)
48 { 85 {
49 if (s) ++refcnt (); 86 ++refcnt ();
50 } 87 }
51 88
52 explicit shstr (const char *s) 89 explicit shstr (const char *s)
53 : s (intern (s)) 90 : s (intern (s))
54 { 91 {
55 } 92 }
56 93
57 ~shstr () 94 ~shstr ()
58 { 95 {
59 if (s) --refcnt (); 96 --refcnt ();
60 } 97 }
61 98
62 const shstr &operator =(const shstr &sh) 99 const shstr &operator =(const shstr &sh)
63 { 100 {
64 if (s) --refcnt (); 101 --refcnt ();
65 s = sh.s; 102 s = sh.s;
66 if (s) ++refcnt (); 103 ++refcnt ();
67 104
68 return *this; 105 return *this;
69 } 106 }
70 107
71 const shstr &operator =(const char *str) 108 const shstr &operator =(const char *str)
72 { 109 {
73 if (s) --refcnt (); 110 --refcnt ();
111
112 // this optimises the important case of str == constant 0
113 if (is_constant (str))
114 s = str ? intern (str) : null;
115 else
74 s = intern (str); 116 s = intern (str);
75 117
76 return *this; 118 return *this;
119 }
120
121 bool operator ==(const shstr &b)
122 {
123 return s == b.s;
124 }
125
126 bool operator !=(const shstr &b)
127 {
128 return !(*this == b);
77 } 129 }
78}; 130};
79 131
80inline int strlen (const shstr &sh) 132inline int strlen (const shstr &sh)
81{ 133{
82 return sh.length (); 134 return sh.length ();
83} 135}
84 136
137inline int strcmp (const shstr &a, const shstr &b)
138{
139 // TODO: use this to find all the occurences of people using strcmp
140 // all uses should be bogus, as we should be never interested in
141 // comparing shstr's alphabetically
142#if 0
143 extern void do_not_use_strcmp_to_compare_shstr_values ();
144 do_not_use_strcmp_to_compare_shstr_values ();
145#endif
146 return a != b;
147}
148
149static std::ostream &operator <<(std::ostream &o, const shstr &sh)
150{
151 o.write (sh.s, sh.length ());
152 return o;
153}
154
155// only good for mass comparisons to shstr objects
156struct shstr_cmp
157{
158 const char *s;
159
160 explicit shstr_cmp (const char *s)
161 : s (shstr::find (s))
162 {
163 }
164
165 shstr_cmp (const shstr_cmp &sh)
166 : s (sh.s)
167 {
168 }
169
170 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; }
171 operator const char *() const { return s; }
172};
173
85inline bool operator ==(const shstr &a, const shstr &b) 174inline bool operator ==(const shstr_cmp &a, const shstr &b)
86{ 175{
87 return a.s == b.s; 176 return a.s == b.s;
88} 177}
89 178
90inline bool operator !=(const shstr &a, const shstr &b) 179inline bool operator ==(const shstr &a, const shstr_cmp &b)
91{ 180{
92 return !(a == b); 181 return b == a;
93} 182}
183
184extern const shstr shstr_null;
185
186#define def(str) extern const shstr shstr_ ## str;
187# include "shstrinc.h"
188#undef def
94 189
95#endif 190#endif
96 191

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