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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.5 by root, Sun Sep 3 00:18:41 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 int &refcnt () 37 static int &refcnt (const char *s)
11 { 38 {
12 return *((int *)s - 1); 39 return *((int *)s - 1);
40 }
41
42 static int &length (const char *s)
43 {
44 return *((int *)s - 2);
45 }
46
47 int &refcnt () const
48 {
49 return refcnt (s);
50 }
51
52 int length () const
53 {
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;
13 } 63 }
14 64
15 static const char *find (const char *s); 65 static const char *find (const char *s);
16 static const char *intern (const char *s); 66 static const char *intern (const char *s);
17 67
18 static void gc (); // garbage collect a few strings 68 static void gc (); // garbage collect a few strings
19 69
20 // this is used for informational messages and the like I/O 70 // this is used for informational messages and the like
21 const char *operator &() const { return s ? s : "<nil>"; } 71 const char *operator &() const { return s; }
22 72
23 const char &operator [](int i) { return s[i]; } 73 const char &operator [](int i) const { return s[i]; }
24 operator const char *() const { return s; } 74 operator const char *() const { return s == null ? 0 : s; }
25
26 int length () const
27 {
28 return s ? *((int *)s - 2) : 0;
29 }
30 75
31 shstr () 76 shstr ()
32 : s (0) 77 : s (null)
33 { 78 {
34 } 79 }
35 80
36 shstr (shstr &sh) 81 shstr (const shstr &sh)
37 : s (sh.s) 82 : s (sh.s)
38 { 83 {
39 if (s) ++refcnt (); 84 ++refcnt ();
40 } 85 }
41 86
42 explicit shstr (const char *s) 87 explicit shstr (const char *s)
43 : s (intern (s)) 88 : s (intern (s))
44 { 89 {
45 if (s) ++refcnt ();
46 } 90 }
47 91
48 ~shstr () 92 ~shstr ()
49 { 93 {
50 if (s) --refcnt (); 94 --refcnt ();
51 } 95 }
52 96
53 const shstr &operator =(const shstr &sh) 97 const shstr &operator =(const shstr &sh)
54 { 98 {
55 if (s) --refcnt (); 99 --refcnt ();
56 s = sh.s; 100 s = sh.s;
57 if (s) ++refcnt (); 101 ++refcnt ();
58 102
59 return *this; 103 return *this;
60 } 104 }
61 105
62 const shstr &operator =(const char *str) 106 const shstr &operator =(const char *str)
63 { 107 {
64 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
65 s = intern (str); 114 s = intern (str);
66 115
67 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);
68 } 127 }
69}; 128};
70 129
71inline int strlen (const shstr &sh) 130inline int strlen (const shstr &sh)
72{ 131{
73 return sh.length (); 132 return sh.length ();
74} 133}
75 134
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
76inline bool operator ==(const shstr &a, const shstr &b) 172inline bool operator ==(const shstr_cmp &a, const shstr &b)
77{ 173{
78 return a.s == b.s; 174 return a.s == b.s;
79} 175}
80 176
81inline bool operator !=(const shstr &a, const shstr &b) 177inline bool operator ==(const shstr &a, const shstr_cmp &b)
82{ 178{
83 return !(a == b); 179 return b == a;
84} 180}
181
182#define def(str) extern const shstr shstr_ ## str;
183# include "shstrinc.h"
184#undef def
85 185
86#endif 186#endif
87 187

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