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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.15 by root, Mon May 14 21:52:32 2007 UTC vs.
Revision 1.41 by root, Tue Jan 3 11:25:32 2012 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 *
6 * Deliantra is free software: you can redistribute it and/or modify it under
7 * the terms of the Affero GNU General Public License as published by the
8 * Free Software Foundation, either version 3 of the License, or (at your
9 * 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 Affero GNU General Public License
17 * and the GNU General Public License along with this program. If not, see
18 * <http://www.gnu.org/licenses/>.
19 *
20 * The authors can be reached via e-mail to <support@deliantra.net>
21 */
22
1#ifndef SHSTR_H__ 23#ifndef SHSTR_H__
2#define SHSTR_H__ 24#define SHSTR_H__
3 25
26#include <cstring>
4#include <sstream> 27#include <sstream>
5 28
6#include "util.h" 29#include "traits.h"
30
31extern size_t shstr_alloc;
7 32
8extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 33extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
9 34
35template<int size>
10struct shstr 36struct shstr_vec
11{ 37{
12 static const char *null; 38 uint32_t hash;
39 uint32_t len;
40 uint32_t refcnt;
41 // pointer points here
42 char string [size];
43};
44
45// this class is a non-refcounted shared string
46// it cannot be used to create or store shared strings, but
47// it can be used to pass shared strings around, i.e. as function arguments
48// or return values. their lifetime must not span a gc () call, i.e.
49// they are only valid as temporary values within the same server tick.
50struct shstr_tmp
51{
52 static shstr_vec<sizeof ("(null)")> nullvec;
53 static const char *null () { return nullvec.string; } // this is the null pointer value
13 54
14 const char *s; 55 const char *s;
15 56
16 static int &refcnt (const char *s) 57 static unsigned int &hash (const char *s)
17 { 58 {
18 return *((int *)s - 1); 59 return *((unsigned int *)s - 3);
19 } 60 }
20 61
62 int hash () const
63 {
64 return hash (s);
65 }
66
21 static int &length (const char *s) 67 static unsigned int &length (const char *s)
22 { 68 {
23 return *((int *)s - 2); 69 return *((unsigned int *)s - 2);
24 } 70 }
25 71
26 int &refcnt () const 72 int length () const
73 {
74 return length (s);
75 }
76
77 // returns whether this shared string begins with the given prefix,
78 // used mainly for searches when users give only the start of a name.
79 bool starts_with (const char *prefix) const
80 {
81 int plen = strlen (prefix);
82
83 return length () >= plen && !strncasecmp (s, prefix, plen);
84 }
85
86 // returns true if the substring is contained in the shstr
87 // if the shstr is 0, then this always returns false.
88 // the shstr is (theoretically) treated as a comma/colon/space etc. separated list.
89 bool contains (const char *substring) const;
90
91 //TODO: case sensitive should be eradicated
92 bool eq_nc (const char *otherstring) const
93 {
94 return !strcasecmp (s, otherstring);
95 }
96
97 shstr_tmp ()
98 : s (null ())
99 {
100 }
101
102 shstr_tmp (const shstr_tmp &sh)
103 : s (sh.s)
104 {
105 }
106
107 shstr_tmp operator =(const shstr_tmp &sh)
108 {
109 s = sh.s;
110
111 return *this;
112 }
113
114 // this is used for informational messages and the like
115 const char *operator &() const { return s; }
116
117 operator const char *() const { return s == null () ? 0 : s; }
118
119protected:
120 // dummy is there so it isn't used as type converter accidentally
121 shstr_tmp (int dummy, const char *s)
122 : s(s)
123 {
124 }
125};
126
127inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
128{
129 return a.s == b.s;
130}
131
132inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
133{
134 return a.s != b.s;
135}
136
137inline int strlen (shstr_tmp sh)
138{
139 return sh.length ();
140}
141
142static inline std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
143{
144 o.write (sh.s, sh.length ());
145
146 return o;
147}
148
149struct shstr : shstr_tmp
150{
151 static unsigned int &refcnt (const char *s)
152 {
153 return *((unsigned int *)s - 1);
154 }
155
156 unsigned int &refcnt () const
27 { 157 {
28 return refcnt (s); 158 return refcnt (s);
29 } 159 }
30 160
31 int length () const 161 shstr ()
32 { 162 {
33 return length (s);
34 }
35
36 // returns wether this shared string begins with the given prefix,
37 // used mainly for searched when users give only the start of a name.
38 bool begins_with (const char *prefix) const
39 {
40 int plen = strlen (prefix);
41 return !strncasecmp (s, prefix, plen) && length () >= plen;
42 } 163 }
43 164
44 static const char *find (const char *s); 165 static const char *find (const char *s);
45 static const char *intern (const char *s); 166 static const char *intern (const char *s);
46 167
47 static void gc (); // garbage collect a few strings 168 static void gc (); // garbage collect a few strings
48 169
49 // this is used for informational messages and the like
50 const char *operator &() const { return s; }
51
52 const char &operator [](int i) const { return s[i]; }
53 operator const char *() const { return s == null ? 0 : s; }
54
55 shstr ()
56 : s (null)
57 {
58 }
59
60 shstr (const shstr &sh) 170 shstr (const shstr &sh)
61 : s (sh.s) 171 : shstr_tmp (sh)
62 { 172 {
63 ++refcnt (); 173 ++refcnt ();
64 } 174 }
65 175
176 shstr (const shstr_tmp &sh)
177 : shstr_tmp (sh)
178 {
179 ++refcnt ();
180 }
181
66 explicit shstr (const char *s) 182 explicit shstr (const char *str)
67 : s (intern (s)) 183 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
68 { 184 {
69 } 185 }
70 186
71 ~shstr () 187 ~shstr ()
72 { 188 {
73 --refcnt (); 189 --refcnt ();
74 } 190 }
75 191
192 using shstr_tmp::operator &;
193 using shstr_tmp::operator const char *;
194
195 // (note: not the copy constructor)
76 const shstr &operator =(const shstr &sh) 196 shstr &operator =(const shstr_tmp &sh)
77 { 197 {
78 --refcnt (); 198 --refcnt ();
79 s = sh.s; 199 s = sh.s;
80 ++refcnt (); 200 ++refcnt ();
81 201
82 return *this; 202 return *this;
83 } 203 }
84 204
205 // here it comes
206 shstr &operator =(const shstr &sh)
207 {
208 return (*this) = (shstr_tmp)sh;
209 }
210
211 // shstr_tmp doesn't have this one
85 const shstr &operator =(const char *str) 212 shstr &operator =(const char *str)
86 { 213 {
87 --refcnt (); 214 --refcnt ();
88 215 s = is_constant (str) && !str ? null () : intern (str);
89 // this optimises the important case of str == constant 0
90 if (is_constant (str))
91 s = str ? intern (str) : null;
92 else
93 s = intern (str);
94 216
95 return *this; 217 return *this;
96 } 218 }
219};
97 220
98 bool operator ==(const shstr &b) 221// only good for mass comparisons to shstr objects, or very
222// temporary passing, basically a non-refcounted shstr
223struct shstr_cmp
224{
225 const char *s;
226
227 // initialies to the non-matching string (as opposed to the null string)
228 shstr_cmp ()
99 { 229 {
230 s = 0;
231 }
232
233 shstr_cmp (const char *str)
234 : s (shstr::find (str))
235 {
236 }
237
238 shstr_cmp (shstr_tmp sh)
239 : s (sh.s)
240 {
241 }
242
243 // this is used for informational messages and the like
244 const char *operator &() const { return s; }
245
246 operator const char *() const { return s; }
247};
248
249inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
250{
100 return s == b.s; 251 return a.s == b.s;
101 }
102
103 bool operator !=(const shstr &b)
104 {
105 return !(*this == b);
106 }
107};
108
109inline int strlen (const shstr &sh)
110{
111 return sh.length ();
112} 252}
113 253
114inline int strcmp (const shstr &a, const shstr &b) 254inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
115{ 255{
116 // TODO: use this to find all the occurences of people using strcmp 256 return a.s == b.s;
117 // all uses should be bogus, as we should be never interested in 257}
118 // comparing shstr's alphabetically 258
119#if 0 259#define def2(id,str) extern const shstr id;
120 extern void do_not_use_strcmp_to_compare_shstr_values (); 260#define def(id) def2(shstr_ ## id, # id)
121 do_not_use_strcmp_to_compare_shstr_values (); 261# include "shstrinc.h"
262#undef def
263#undef def2
264
265// undefined external reference to catch people using str* functions when they shouldn't
266//template<class any> void strcmp (const shstr_tmp &a, any b);
267template<class any> void strstr (const shstr_tmp &a, any b);
268
122#endif 269#endif
123 return a != b;
124}
125 270
126static std::ostream &operator <<(std::ostream &o, const shstr &sh)
127{
128 o.write (sh.s, sh.length ());
129 return o;
130}
131
132// only good for mass comparisons to shstr objects
133struct shstr_cmp
134{
135 const char *s;
136
137 explicit shstr_cmp (const char *s)
138 : s (shstr::find (s))
139 {
140 }
141
142 shstr_cmp (const shstr_cmp &sh)
143 : s (sh.s)
144 {
145 }
146
147 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; }
148 operator const char *() const { return s; }
149};
150
151inline bool operator ==(const shstr_cmp &a, const shstr &b)
152{
153 return a.s == b.s;
154}
155
156inline bool operator ==(const shstr &a, const shstr_cmp &b)
157{
158 return b == a;
159}
160
161extern const shstr undead_name; /* Used in hit_player() in main.c */
162
163#endif
164

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