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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 1.18 by root, Tue Jul 10 05:51:38 2007 UTC

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

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