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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.22 by root, Tue May 6 16:55:26 2008 UTC vs.
Revision 1.45 by root, Sat Nov 17 23:40:01 2018 UTC

1/* 1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team
4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team 5 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 6 *
6 * Deliantra is free software: you can redistribute it and/or modify 7 * Deliantra is free software: you can redistribute it and/or modify it under
7 * it under the terms of the GNU General Public License as published by 8 * the terms of the Affero GNU General Public License as published by the
8 * the Free Software Foundation, either version 3 of the License, or 9 * Free Software Foundation, either version 3 of the License, or (at your
9 * (at your option) any later version. 10 * option) any later version.
10 * 11 *
11 * This program is distributed in the hope that it will be useful, 12 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details. 15 * GNU General Public License for more details.
15 * 16 *
16 * You should have received a copy of the GNU General Public License 17 * You should have received a copy of the Affero GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 * and the GNU General Public License along with this program. If not, see
19 * <http://www.gnu.org/licenses/>.
18 * 20 *
19 * The authors can be reached via e-mail to <support@deliantra.net> 21 * The authors can be reached via e-mail to <support@deliantra.net>
20 */ 22 */
21 23
22#ifndef SHSTR_H__ 24#ifndef SHSTR_H__
23#define SHSTR_H__ 25#define SHSTR_H__
24 26
27#include <cstring>
25#include <sstream> 28#include <sstream>
26 29
27#include "util.h" 30#include "traits.h"
28 31
29extern size_t shstr_alloc; 32extern size_t shstr_alloc;
30 33
31extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 34extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
32 35
36template<int size>
33struct shstr 37struct shstr_vec
34{ 38{
35 static const char *null; 39 uint32_t hash;
40 uint32_t len;
41 uint32_t refcnt;
42 // pointer points here
43 char string [size];
44};
45
46// this class is a non-refcounted shared string
47// it cannot be used to create or store shared strings, but
48// it can be used to pass shared strings around, i.e. as function arguments
49// or return values. their lifetime must not span a gc () call, i.e.
50// they are only valid as temporary values within the same server tick.
51struct shstr_tmp
52{
53 static shstr_vec<sizeof ("(null)")> nullvec;
54 static const char *null () { return nullvec.string; } // this is the null pointer value
36 55
37 const char *s; 56 const char *s;
38 57
39 static int &refcnt (const char *s) 58 static unsigned int &hash (const char *s)
40 { 59 {
41 return *((int *)s - 1); 60 return *((unsigned int *)s - 3);
42 } 61 }
43 62
63 int hash () const
64 {
65 return hash (s);
66 }
67
44 static int &length (const char *s) 68 static unsigned int &length (const char *s)
45 { 69 {
46 return *((int *)s - 2); 70 return *((unsigned int *)s - 2);
47 } 71 }
48 72
49 int &refcnt () const 73 int length () const
74 {
75 return length (s);
76 }
77
78 // returns whether this shared string begins with the given prefix,
79 // used mainly for searches when users give only the start of a name.
80 bool starts_with (const char *prefix) const
81 {
82 int plen = strlen (prefix);
83
84 return length () >= plen && !strncasecmp (s, prefix, plen);
85 }
86
87 // returns true if the substring is contained in the shstr
88 // if the shstr is 0, then this always returns false.
89 // the shstr is (theoretically) treated as a comma/colon/space etc. separated list.
90 bool contains (const char *substring) const;
91
92 //TODO: case sensitive should be eradicated
93 bool eq_nc (const char *otherstring) const
94 {
95 return !strcasecmp (s, otherstring);
96 }
97
98 shstr_tmp ()
99 : s (null ())
100 {
101 }
102
103 shstr_tmp (const shstr_tmp &sh)
104 : s (sh.s)
105 {
106 }
107
108 shstr_tmp operator =(const shstr_tmp &sh)
109 {
110 s = sh.s;
111
112 return *this;
113 }
114
115 // this is used for informational messages and the like
116 const char *operator &() const { return s; }
117
118 operator const char *() const { return s == null () ? 0 : s; }
119
120protected:
121 // dummy is there so it isn't used as type converter accidentally
122 shstr_tmp (int dummy, const char *s)
123 : s(s)
124 {
125 }
126};
127
128inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
129{
130 return a.s == b.s;
131}
132
133inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
134{
135 return a.s != b.s;
136}
137
138inline int strlen (shstr_tmp sh)
139{
140 return sh.length ();
141}
142
143static inline std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
144{
145 o.write (sh.s, sh.length ());
146
147 return o;
148}
149
150struct shstr : shstr_tmp
151{
152 static unsigned int &refcnt (const char *s)
153 {
154 return *((unsigned int *)s - 1);
155 }
156
157 unsigned int &refcnt () const
50 { 158 {
51 return refcnt (s); 159 return refcnt (s);
52 } 160 }
53 161
54 int length () const 162 shstr ()
55 { 163 {
56 return length (s);
57 }
58
59 // returns wether this shared string begins with the given prefix,
60 // used mainly for searched when users give only the start of a name.
61 bool begins_with (const char *prefix) const
62 {
63 int plen = strlen (prefix);
64 return !strncasecmp (s, prefix, plen) && length () >= plen;
65 } 164 }
66 165
67 static const char *find (const char *s); 166 static const char *find (const char *s);
68 static const char *intern (const char *s); 167 static const char *intern (const char *s);
69 168
70 static void gc (); // garbage collect a few strings 169 static void gc (); // garbage collect a few strings
71 170
72 // this is used for informational messages and the like
73 const char *operator &() const { return s; }
74
75 const char &operator [](int i) const { return s[i]; }
76 operator const char *() const { return s == null ? 0 : s; }
77
78 shstr ()
79 : s (null)
80 {
81 }
82
83 shstr (const shstr &sh) 171 shstr (const shstr &sh)
84 : s (sh.s) 172 : shstr_tmp (sh)
85 { 173 {
86 ++refcnt (); 174 ++refcnt ();
87 } 175 }
88 176
177 shstr (const shstr_tmp &sh)
178 : shstr_tmp (sh)
179 {
180 ++refcnt ();
181 }
182
89 explicit shstr (const char *s) 183 explicit shstr (const char *str)
90 : s (intern (s)) 184 : shstr_tmp (0, ecb_is_constant (str) && !str ? null () : intern (str))
91 { 185 {
92 } 186 }
93 187
94 ~shstr () 188 ~shstr ()
95 { 189 {
96 --refcnt (); 190 --refcnt ();
97 } 191 }
98 192
193 using shstr_tmp::operator &;
194 using shstr_tmp::operator const char *;
195
196 // (note: not the copy constructor)
99 const shstr &operator =(const shstr &sh) 197 shstr &operator =(const shstr_tmp &sh)
100 { 198 {
101 --refcnt (); 199 --refcnt ();
102 s = sh.s; 200 s = sh.s;
103 ++refcnt (); 201 ++refcnt ();
104 202
105 return *this; 203 return *this;
106 } 204 }
107 205
206 // here it comes
207 shstr &operator =(const shstr &sh)
208 {
209 return (*this) = (shstr_tmp)sh;
210 }
211
212 // shstr_tmp doesn't have this one
108 const shstr &operator =(const char *str) 213 shstr &operator =(const char *str)
109 { 214 {
110 --refcnt (); 215 --refcnt ();
111 216 s = ecb_is_constant (str) && !str ? null () : intern (str);
112 // this optimises the important case of str == constant 0
113 if (is_constant (str))
114 s = str ? intern (str) : null;
115 else
116 s = intern (str);
117 217
118 return *this; 218 return *this;
119 } 219 }
120
121 bool operator ==(const shstr &b)
122 {
123 return s == b.s;
124 }
125
126 bool operator !=(const shstr &b)
127 {
128 return !(*this == b);
129 }
130}; 220};
131 221
132inline int strlen (const shstr &sh)
133{
134 return sh.length ();
135}
136
137inline int strcmp (const shstr &a, const shstr &b)
138{
139 // TODO: use this to find all the occurences of people using strcmp
140 // all uses should be bogus, as we should be never interested in
141 // comparing shstr's alphabetically
142#if 0
143 extern void do_not_use_strcmp_to_compare_shstr_values ();
144 do_not_use_strcmp_to_compare_shstr_values ();
145#endif
146 return a != b;
147}
148
149static std::ostream &operator <<(std::ostream &o, const shstr &sh)
150{
151 o.write (sh.s, sh.length ());
152 return o;
153}
154
155// only good for mass comparisons to shstr objects 222// only good for mass comparisons to shstr objects, or very
223// temporary passing, basically a non-refcounted shstr
156struct shstr_cmp 224struct shstr_cmp
157{ 225{
158 const char *s; 226 const char *s;
159 227
228 // initialies to the non-matching string (as opposed to the null string)
229 shstr_cmp ()
230 {
231 s = 0;
232 }
233
160 explicit shstr_cmp (const char *s) 234 shstr_cmp (const char *str)
161 : s (shstr::find (s)) 235 : s (shstr::find (str))
162 { 236 {
163 } 237 }
164 238
165 shstr_cmp (const shstr_cmp &sh) 239 shstr_cmp (shstr_tmp sh)
166 : s (sh.s) 240 : s (sh.s)
167 { 241 {
168 } 242 }
169 243
170 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } 244 // this is used for informational messages and the like
245 const char *operator &() const { return s; }
246
171 operator const char *() const { return s; } 247 operator const char *() const { return s; }
172}; 248};
173 249
174inline bool operator ==(const shstr_cmp &a, const shstr &b) 250inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
175{ 251{
176 return a.s == b.s; 252 return a.s == b.s;
177} 253}
178 254
179inline bool operator ==(const shstr &a, const shstr_cmp &b) 255inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
180{ 256{
181 return b == a; 257 return a.s == b.s;
182} 258}
183 259
184extern const shstr shstr_null;
185
186#define def(str) extern const shstr shstr_ ## str; 260#define def2(id,str) extern const shstr id;
261#define def(id) def2(shstr_ ## id, # id)
187# include "shstrinc.h" 262# include "shstrinc.h"
188#undef def 263#undef def
264#undef def2
265
266// undefined external reference to catch people using str* functions when they shouldn't
267//template<class any> void strcmp (const shstr_tmp &a, any b);
268template<class any> void strstr (const shstr_tmp &a, any b);
189 269
190#endif 270#endif
191 271

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