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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.17 by root, Sun Jul 1 05:00:18 2007 UTC vs.
Revision 1.27 by root, Wed Dec 31 18:29:44 2008 UTC

1/* 1/*
2 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team 4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 5 *
6 * Crossfire TRT is free software: you can redistribute it and/or modify 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 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 8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version. 9 * (at your option) any later version.
10 * 10 *
11 * This program is distributed in the hope that it will be useful, 11 * This program is distributed in the hope that it will be useful,
… …
14 * GNU General Public License for more details. 14 * GNU General Public License for more details.
15 * 15 *
16 * You should have received a copy of the GNU General Public License 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/>. 17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 * 18 *
19 * The authors can be reached via e-mail to <crossfire@schmorp.de> 19 * The authors can be reached via e-mail to <support@deliantra.net>
20 */ 20 */
21 21
22#ifndef SHSTR_H__ 22#ifndef SHSTR_H__
23#define SHSTR_H__ 23#define SHSTR_H__
24 24
25#include <cstring>
25#include <sstream> 26#include <sstream>
26 27
27#include "util.h" 28#include "traits.h"
29
30extern size_t shstr_alloc;
28 31
29extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
30 33
34template<int size>
31struct shstr 35struct shstr_vec
32{ 36{
33 static const char *null; 37 uint32_t len;
38 uint32_t refcnt;
39 char string[size];
40};
41
42// this class is a non-refcounted shared string
43// it cannot be used to create or store shared strings, but
44// it can be used to apss shared strings around, i.e. as function arguments
45// or return values. their lifetime must not span a gc () call, i.e.
46// they are only valid as temporary values within the same server tick.
47struct shstr_tmp
48{
49 static shstr_vec<sizeof ("(null)")> nullvec;
50 static const char *null () { return nullvec.string; } // this is the null pointer value
34 51
35 const char *s; 52 const char *s;
36 53
37 static int &refcnt (const char *s)
38 {
39 return *((int *)s - 1);
40 }
41
42 static int &length (const char *s) 54 static unsigned int &length (const char *s)
43 { 55 {
44 return *((int *)s - 2); 56 return *((unsigned int *)s - 2);
45 } 57 }
46 58
47 int &refcnt () const 59 int length () const
60 {
61 return length (s);
62 }
63
64 // returns whether this shared string begins with the given prefix,
65 // used mainly for searches when users give only the start of a name.
66 bool starts_with (const char *prefix) const
67 {
68 int plen = strlen (prefix);
69
70 return length () >= plen && !strncasecmp (s, prefix, plen);
71 }
72
73 bool contains (const char *substring) const
74 {
75 return strstr (s, substring);
76 }
77
78 shstr_tmp ()
79 : s (null ())
80 {
81 }
82
83 shstr_tmp (const shstr_tmp &sh)
84 : s (sh.s)
85 {
86 }
87
88 shstr_tmp operator =(const shstr_tmp &sh)
89 {
90 s = sh.s;
91
92 return *this;
93 }
94
95 // this is used for informational messages and the like
96 const char *operator &() const { return s; }
97
98 operator const char *() const { return s == null () ? 0 : s; }
99
100protected:
101 // dummy is there so it isn't used as type converter accidentally
102 shstr_tmp (int dummy, const char *s)
103 : s(s)
104 {
105 }
106};
107
108inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
109{
110 return a.s == b.s;
111}
112
113inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
114{
115 return a.s != b.s;
116}
117
118inline int strlen (const shstr_tmp &sh)
119{
120 return sh.length ();
121}
122
123// undefined external reference to catch people using strcmp when they shouldn't
124int strcmp (const shstr_tmp &a, const shstr_tmp &b);
125
126static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
127{
128 o.write (sh.s, sh.length ());
129
130 return o;
131}
132
133struct shstr : shstr_tmp
134{
135 static unsigned int &refcnt (const char *s)
136 {
137 return *((unsigned int *)s - 1);
138 }
139
140 unsigned int &refcnt () const
48 { 141 {
49 return refcnt (s); 142 return refcnt (s);
50 } 143 }
51 144
52 int length () const 145 shstr ()
53 { 146 {
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;
63 } 147 }
64 148
65 static const char *find (const char *s); 149 static const char *find (const char *s);
66 static const char *intern (const char *s); 150 static const char *intern (const char *s);
67 151
68 static void gc (); // garbage collect a few strings 152 static void gc (); // garbage collect a few strings
69 153
70 // this is used for informational messages and the like
71 const char *operator &() const { return s; }
72
73 const char &operator [](int i) const { return s[i]; }
74 operator const char *() const { return s == null ? 0 : s; }
75
76 shstr ()
77 : s (null)
78 {
79 }
80
81 shstr (const shstr &sh) 154 shstr (const shstr &sh)
82 : s (sh.s) 155 : shstr_tmp (sh)
83 { 156 {
84 ++refcnt (); 157 ++refcnt ();
85 } 158 }
86 159
160 shstr (const shstr_tmp &sh)
161 : shstr_tmp (sh)
162 {
163 ++refcnt ();
164 }
165
87 explicit shstr (const char *s) 166 explicit shstr (const char *str)
88 : s (intern (s)) 167 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
89 { 168 {
90 } 169 }
91 170
92 ~shstr () 171 ~shstr ()
93 { 172 {
94 --refcnt (); 173 --refcnt ();
95 } 174 }
96 175
176 using shstr_tmp::operator &;
177 using shstr_tmp::operator const char *;
178
179 // (note: not the copy constructor)
97 const shstr &operator =(const shstr &sh) 180 shstr &operator =(const shstr_tmp &sh)
98 { 181 {
99 --refcnt (); 182 --refcnt ();
100 s = sh.s; 183 s = sh.s;
101 ++refcnt (); 184 ++refcnt ();
102 185
103 return *this; 186 return *this;
104 } 187 }
105 188
189 // here it comes
190 shstr &operator =(const shstr &sh)
191 {
192 return (*this) = (shstr_tmp)sh;
193 }
194
195 // shstr_tmp doesn't have this one
106 const shstr &operator =(const char *str) 196 shstr &operator =(const char *str)
107 { 197 {
108 --refcnt (); 198 --refcnt ();
109 199 s = is_constant (str) && !str ? null () : intern (str);
110 // this optimises the important case of str == constant 0
111 if (is_constant (str))
112 s = str ? intern (str) : null;
113 else
114 s = intern (str);
115 200
116 return *this; 201 return *this;
117 } 202 }
203};
118 204
119 bool operator ==(const shstr &b) 205// only good for mass comparisons to shstr objects, or very
206// temporary passing, basically a non-refcounted shstr
207struct shstr_cmp
208{
209 const char *s;
210
211 explicit shstr_cmp (const char *str)
212 : s (shstr::find (str))
120 { 213 {
214 }
215
216 shstr_cmp (shstr_tmp sh)
217 : s (sh.s)
218 {
219 }
220
221 // this is used for informational messages and the like
222 const char *operator &() const { return s; }
223
224 operator const char *() const { return s; }
225};
226
227inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
228{
121 return s == b.s; 229 return a.s == b.s;
122 }
123
124 bool operator !=(const shstr &b)
125 {
126 return !(*this == b);
127 }
128};
129
130inline int strlen (const shstr &sh)
131{
132 return sh.length ();
133} 230}
134 231
135inline int strcmp (const shstr &a, const shstr &b) 232inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
136{ 233{
137 // TODO: use this to find all the occurences of people using strcmp 234 return a.s == b.s;
138 // all uses should be bogus, as we should be never interested in 235}
139 // comparing shstr's alphabetically 236
140#if 0 237#define def(str) extern const shstr shstr_ ## str;
141 extern void do_not_use_strcmp_to_compare_shstr_values (); 238# include "shstrinc.h"
142 do_not_use_strcmp_to_compare_shstr_values (); 239#undef def
240
143#endif 241#endif
144 return a != b;
145}
146 242
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
172inline bool operator ==(const shstr_cmp &a, const shstr &b)
173{
174 return a.s == b.s;
175}
176
177inline bool operator ==(const shstr &a, const shstr_cmp &b)
178{
179 return b == a;
180}
181
182extern const shstr undead_name; /* Used in hit_player() in main.c */
183
184#endif
185

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