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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.14 by root, Mon Apr 23 16:07:00 2007 UTC vs.
Revision 1.43 by root, Wed Nov 16 23:42:01 2016 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 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 } 163 }
35 164
36 static const char *find (const char *s); 165 static const char *find (const char *s);
37 static const char *intern (const char *s); 166 static const char *intern (const char *s);
38 167
39 static void gc (); // garbage collect a few strings 168 static void gc (); // garbage collect a few strings
40 169
41 // this is used for informational messages and the like
42 const char *operator &() const { return s; }
43
44 const char &operator [](int i) const { return s[i]; }
45 operator const char *() const { return s == null ? 0 : s; }
46
47 shstr ()
48 : s (null)
49 {
50 }
51
52 shstr (const shstr &sh) 170 shstr (const shstr &sh)
53 : s (sh.s) 171 : shstr_tmp (sh)
54 { 172 {
55 ++refcnt (); 173 ++refcnt ();
56 } 174 }
57 175
176 shstr (const shstr_tmp &sh)
177 : shstr_tmp (sh)
178 {
179 ++refcnt ();
180 }
181
58 explicit shstr (const char *s) 182 explicit shstr (const char *str)
59 : s (intern (s)) 183 : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
60 { 184 {
61 } 185 }
62 186
63 ~shstr () 187 ~shstr ()
64 { 188 {
65 --refcnt (); 189 --refcnt ();
66 } 190 }
67 191
192 using shstr_tmp::operator &;
193 using shstr_tmp::operator const char *;
194
195 // (note: not the copy constructor)
68 const shstr &operator =(const shstr &sh) 196 shstr &operator =(const shstr_tmp &sh)
69 { 197 {
70 --refcnt (); 198 --refcnt ();
71 s = sh.s; 199 s = sh.s;
72 ++refcnt (); 200 ++refcnt ();
73 201
74 return *this; 202 return *this;
75 } 203 }
76 204
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
77 const shstr &operator =(const char *str) 212 shstr &operator =(const char *str)
78 { 213 {
79 --refcnt (); 214 --refcnt ();
80 215 s = is_constant (str) && !str ? null () : intern (str);
81 // this optimises the important case of str == constant 0
82 if (is_constant (str))
83 s = str ? intern (str) : null;
84 else
85 s = intern (str);
86 216
87 return *this; 217 return *this;
88 } 218 }
219};
89 220
90 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 ()
91 { 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{
92 return s == b.s; 251 return a.s == b.s;
93 }
94
95 bool operator !=(const shstr &b)
96 {
97 return !(*this == b);
98 }
99};
100
101inline int strlen (const shstr &sh)
102{
103 return sh.length ();
104} 252}
105 253
106inline int strcmp (const shstr &a, const shstr &b) 254inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
107{ 255{
108 // TODO: use this to find all the occurences of people using strcmp 256 return a.s == b.s;
109 // all uses should be bogus, as we should be never interested in 257}
110 // comparing shstr's alphabetically 258
111#if 0 259#define def2(id,str) extern const shstr id;
112 extern void do_not_use_strcmp_to_compare_shstr_values (); 260#define def(id) def2(shstr_ ## id, # id)
113 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
114#endif 269#endif
115 return a != b;
116}
117 270
118static std::ostream &operator <<(std::ostream &o, const shstr &sh)
119{
120 o.write (sh.s, sh.length ());
121 return o;
122}
123
124// only good for mass comparisons to shstr objects
125struct shstr_cmp
126{
127 const char *s;
128
129 explicit shstr_cmp (const char *s)
130 : s (shstr::find (s))
131 {
132 }
133
134 shstr_cmp (const shstr_cmp &sh)
135 : s (sh.s)
136 {
137 }
138
139 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; }
140 operator const char *() const { return s; }
141};
142
143inline bool operator ==(const shstr_cmp &a, const shstr &b)
144{
145 return a.s == b.s;
146}
147
148inline bool operator ==(const shstr &a, const shstr_cmp &b)
149{
150 return b == a;
151}
152
153extern const shstr undead_name; /* Used in hit_player() in main.c */
154
155#endif
156

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