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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.12 by root, Mon Feb 5 02:07:40 2007 UTC vs.
Revision 1.30 by root, Thu Jan 1 16:05:12 2009 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007,2008 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 <cstring>
26#include <sstream>
27
4#include "util.h" 28#include "traits.h"
29
30extern size_t shstr_alloc;
5 31
6extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
7 33
34template<int size>
8struct shstr 35struct shstr_vec
9{ 36{
10 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
11 51
12 const char *s; 52 const char *s;
13 53
14 static int &refcnt (const char *s)
15 {
16 return *((int *)s - 1);
17 }
18
19 static int &length (const char *s) 54 static unsigned int &length (const char *s)
20 { 55 {
21 return *((int *)s - 2); 56 return *((unsigned int *)s - 2);
22 } 57 }
23 58
24 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
25 { 144 {
26 return refcnt (s); 145 return refcnt (s);
27 } 146 }
28 147
29 int length () const 148 shstr ()
30 { 149 {
31 return length (s);
32 } 150 }
33 151
34 static const char *find (const char *s); 152 static const char *find (const char *s);
35 static const char *intern (const char *s); 153 static const char *intern (const char *s);
36 154
37 static void gc (); // garbage collect a few strings 155 static void gc (); // garbage collect a few strings
38 156
39 // this is used for informational messages and the like
40 const char *operator &() const { return s; }
41
42 const char &operator [](int i) const { return s[i]; }
43 operator const char *() const { return s == null ? 0 : s; }
44
45 shstr ()
46 : s (null)
47 {
48 }
49
50 shstr (const shstr &sh) 157 shstr (const shstr &sh)
51 : s (sh.s) 158 : shstr_tmp (sh)
52 { 159 {
53 ++refcnt (); 160 ++refcnt ();
54 } 161 }
55 162
163 shstr (const shstr_tmp &sh)
164 : shstr_tmp (sh)
165 {
166 ++refcnt ();
167 }
168
56 explicit shstr (const char *s) 169 explicit shstr (const char *str)
57 : s (intern (s)) 170 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
58 { 171 {
59 } 172 }
60 173
61 ~shstr () 174 ~shstr ()
62 { 175 {
63 --refcnt (); 176 --refcnt ();
64 } 177 }
65 178
179 using shstr_tmp::operator &;
180 using shstr_tmp::operator const char *;
181
182 // (note: not the copy constructor)
66 const shstr &operator =(const shstr &sh) 183 shstr &operator =(const shstr_tmp &sh)
67 { 184 {
68 --refcnt (); 185 --refcnt ();
69 s = sh.s; 186 s = sh.s;
70 ++refcnt (); 187 ++refcnt ();
71 188
72 return *this; 189 return *this;
73 } 190 }
74 191
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
75 const shstr &operator =(const char *str) 199 shstr &operator =(const char *str)
76 { 200 {
77 --refcnt (); 201 --refcnt ();
78 202 s = is_constant (str) && !str ? null () : intern (str);
79 // this optimises the important case of str == constant 0
80 if (is_constant (str))
81 s = str ? intern (str) : null;
82 else
83 s = intern (str);
84 203
85 return *this; 204 return *this;
86 } 205 }
206};
87 207
88 bool operator ==(const shstr &b) 208// only good for mass comparisons to shstr objects, or very
209// temporary passing, basically a non-refcounted shstr
210struct shstr_cmp
211{
212 const char *s;
213
214 // initialies to the non-matching string (as opposed to the null string)
215 shstr_cmp ()
89 { 216 {
217 s = 0;
218 }
219
220 shstr_cmp (const char *str)
221 : s (shstr::find (str))
222 {
223 }
224
225 shstr_cmp (shstr_tmp sh)
226 : s (sh.s)
227 {
228 }
229
230 // this is used for informational messages and the like
231 const char *operator &() const { return s; }
232
233 operator const char *() const { return s; }
234};
235
236inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
237{
90 return s == b.s; 238 return a.s == b.s;
91 }
92
93 bool operator !=(const shstr &b)
94 {
95 return !(*this == b);
96 }
97};
98
99inline int strlen (const shstr &sh)
100{
101 return sh.length ();
102} 239}
103 240
104inline int strcmp (const shstr &a, const shstr &b) 241inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
105{ 242{
106 // TODO: use this to find all the occurences of people using strcmp 243 return a.s == b.s;
107 // all uses should be bogus, as we should be never interested in 244}
108 // comparing shstr's alphabetically 245
109#if 0 246#define def2(id,str) extern const shstr id;
110 extern void do_not_use_strcmp_to_compare_shstr_values (); 247#define def(id) def2(shstr_ ## id, # id)
111 do_not_use_strcmp_to_compare_shstr_values (); 248# include "shstrinc.h"
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);
255
112#endif 256#endif
113 return a != b;
114}
115 257
116// only good for mass comparisons to shstr objects
117struct shstr_cmp
118{
119 const char *s;
120
121 explicit shstr_cmp (const char *s)
122 : s (shstr::find (s))
123 {
124 }
125
126 shstr_cmp (const shstr_cmp &sh)
127 : s (sh.s)
128 {
129 }
130
131 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; }
132 operator const char *() const { return s; }
133};
134
135inline bool operator ==(const shstr_cmp &a, const shstr &b)
136{
137 return a.s == b.s;
138}
139
140inline bool operator ==(const shstr &a, const shstr_cmp &b)
141{
142 return b == a;
143}
144
145extern const shstr undead_name; /* Used in hit_player() in main.c */
146
147#endif
148

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