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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.18 by root, Tue Jul 10 05:51:38 2007 UTC vs.
Revision 1.29 by root, Thu Jan 1 15:43:34 2009 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 s != null () && strstr (s, substring);
76 }
77
78 //TODO: case sensitive should be eradicated
79 bool eq_nc (const char *otherstring) const
80 {
81 return !strcasecmp (s, otherstring);
82 }
83
84 shstr_tmp ()
85 : s (null ())
86 {
87 }
88
89 shstr_tmp (const shstr_tmp &sh)
90 : s (sh.s)
91 {
92 }
93
94 shstr_tmp operator =(const shstr_tmp &sh)
95 {
96 s = sh.s;
97
98 return *this;
99 }
100
101 // this is used for informational messages and the like
102 const char *operator &() const { return s; }
103
104 operator const char *() const { return s == null () ? 0 : s; }
105
106protected:
107 // dummy is there so it isn't used as type converter accidentally
108 shstr_tmp (int dummy, const char *s)
109 : s(s)
110 {
111 }
112};
113
114inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
115{
116 return a.s == b.s;
117}
118
119inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
120{
121 return a.s != b.s;
122}
123
124inline int strlen (const shstr_tmp &sh)
125{
126 return sh.length ();
127}
128
129static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
130{
131 o.write (sh.s, sh.length ());
132
133 return o;
134}
135
136struct shstr : shstr_tmp
137{
138 static unsigned int &refcnt (const char *s)
139 {
140 return *((unsigned int *)s - 1);
141 }
142
143 unsigned int &refcnt () const
48 { 144 {
49 return refcnt (s); 145 return refcnt (s);
50 } 146 }
51 147
52 int length () const 148 shstr ()
53 { 149 {
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 } 150 }
64 151
65 static const char *find (const char *s); 152 static const char *find (const char *s);
66 static const char *intern (const char *s); 153 static const char *intern (const char *s);
67 154
68 static void gc (); // garbage collect a few strings 155 static void gc (); // garbage collect a few strings
69 156
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) 157 shstr (const shstr &sh)
82 : s (sh.s) 158 : shstr_tmp (sh)
83 { 159 {
84 ++refcnt (); 160 ++refcnt ();
85 } 161 }
86 162
163 shstr (const shstr_tmp &sh)
164 : shstr_tmp (sh)
165 {
166 ++refcnt ();
167 }
168
87 explicit shstr (const char *s) 169 explicit shstr (const char *str)
88 : s (intern (s)) 170 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
89 { 171 {
90 } 172 }
91 173
92 ~shstr () 174 ~shstr ()
93 { 175 {
94 --refcnt (); 176 --refcnt ();
95 } 177 }
96 178
179 using shstr_tmp::operator &;
180 using shstr_tmp::operator const char *;
181
182 // (note: not the copy constructor)
97 const shstr &operator =(const shstr &sh) 183 shstr &operator =(const shstr_tmp &sh)
98 { 184 {
99 --refcnt (); 185 --refcnt ();
100 s = sh.s; 186 s = sh.s;
101 ++refcnt (); 187 ++refcnt ();
102 188
103 return *this; 189 return *this;
104 } 190 }
105 191
192 // here it comes
193 shstr &operator =(const shstr &sh)
194 {
195 return (*this) = (shstr_tmp)sh;
196 }
197
198 // shstr_tmp doesn't have this one
106 const shstr &operator =(const char *str) 199 shstr &operator =(const char *str)
107 { 200 {
108 --refcnt (); 201 --refcnt ();
109 202 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);
115 203
116 return *this; 204 return *this;
117 } 205 }
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);
127 }
128}; 206};
129 207
130inline int strlen (const shstr &sh)
131{
132 return sh.length ();
133}
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 208// only good for mass comparisons to shstr objects, or very
209// temporary passing, basically a non-refcounted shstr
154struct shstr_cmp 210struct shstr_cmp
155{ 211{
156 const char *s; 212 const char *s;
157 213
214 // initialies to the non-matching string (as opposed to the null string)
215 shstr_cmp ()
216 {
217 s = 0;
218 }
219
158 explicit shstr_cmp (const char *s) 220 shstr_cmp (const char *str)
159 : s (shstr::find (s)) 221 : s (shstr::find (str))
160 { 222 {
161 } 223 }
162 224
163 shstr_cmp (const shstr_cmp &sh) 225 shstr_cmp (shstr_tmp sh)
164 : s (sh.s) 226 : s (sh.s)
165 { 227 {
166 } 228 }
167 229
168 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } 230 // this is used for informational messages and the like
231 const char *operator &() const { return s; }
232
169 operator const char *() const { return s; } 233 operator const char *() const { return s; }
170}; 234};
171 235
172inline bool operator ==(const shstr_cmp &a, const shstr &b) 236inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
173{ 237{
174 return a.s == b.s; 238 return a.s == b.s;
175} 239}
176 240
177inline bool operator ==(const shstr &a, const shstr_cmp &b) 241inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
178{ 242{
179 return b == a; 243 return a.s == b.s;
180} 244}
181 245
182#define def(str) extern const shstr shstr_ ## str; 246#define def2(id,str) extern const shstr shstr_ ## id;
247#define def(id) def2(id, # id)
183# include "shstrinc.h" 248# include "shstrinc.h"
184#undef def 249#undef def
250#undef def2
251
252// undefined external reference to catch people using str* functions when they shouldn't
253//template<class any> void strcmp (const shstr_tmp &a, any b);
254template<class any> void strstr (const shstr_tmp &a, any b);
185 255
186#endif 256#endif
187 257

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