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Comparing deliantra/server/include/shstr.h (file contents):
Revision 1.20 by root, Thu Nov 8 19:43:25 2007 UTC vs.
Revision 1.25 by root, Wed Dec 31 18:07:41 2008 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 (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team 4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 5 *
6 * Deliantra 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.
… …
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"
28 29
29extern size_t shstr_alloc; 30extern size_t shstr_alloc;
30 31
31extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); 32extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
32 33
34template<int size>
33struct shstr 35struct shstr_vec
34{ 36{
35 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
36 51
37 const char *s; 52 const char *s;
38 53
39 static int &refcnt (const char *s)
40 {
41 return *((int *)s - 1);
42 }
43
44 static int &length (const char *s) 54 static unsigned int &length (const char *s)
45 { 55 {
46 return *((int *)s - 2); 56 return *((unsigned int *)s - 2);
47 } 57 }
48 58
49 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 strstr (s, substring);
76 }
77
78 shstr_tmp ()
79 : s (null ())
80 {
81 }
82
83 shstr_tmp (const shstr_tmp &sh)
84 : s (sh.s)
85 {
86 }
87
88 shstr_tmp operator =(const shstr_tmp &sh)
89 {
90 s = sh.s;
91
92 return *this;
93 }
94
95 // this is used for informational messages and the like
96 const char *operator &() const { return s; }
97
98 operator const char *() const { return s == null () ? 0 : s; }
99};
100
101inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
102{
103 return a.s == b.s;
104}
105
106inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
107{
108 return a.s != b.s;
109}
110
111inline int strlen (const shstr_tmp &sh)
112{
113 return sh.length ();
114}
115
116// undefined external reference to catch people using strcmp when they shouldn't
117int strcmp (const shstr_tmp &a, const shstr_tmp &b);
118
119static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
120{
121 o.write (sh.s, sh.length ());
122
123 return o;
124}
125
126struct shstr : shstr_tmp
127{
128 static unsigned int &refcnt (const char *s)
129 {
130 return *((unsigned int *)s - 1);
131 }
132
133 unsigned int &refcnt () const
50 { 134 {
51 return refcnt (s); 135 return refcnt (s);
52 } 136 }
53 137
54 int length () const 138 shstr ()
55 { 139 {
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 } 140 }
66 141
67 static const char *find (const char *s); 142 static const char *find (const char *s);
68 static const char *intern (const char *s); 143 static const char *intern (const char *s);
69 144
70 static void gc (); // garbage collect a few strings 145 static void gc (); // garbage collect a few strings
71 146
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) 147 shstr (const shstr &sh)
84 : s (sh.s) 148 : shstr_tmp (sh)
85 { 149 {
86 ++refcnt (); 150 ++refcnt ();
87 } 151 }
88 152
153 shstr (const shstr_tmp &sh)
154 : shstr_tmp (sh)
155 {
156 ++refcnt ();
157 }
158
89 explicit shstr (const char *s) 159 explicit shstr (const char *str)
90 : s (intern (s))
91 { 160 {
161 s = is_constant (str) && !str ? null () : intern (str);
92 } 162 }
93 163
94 ~shstr () 164 ~shstr ()
95 { 165 {
96 --refcnt (); 166 --refcnt ();
97 } 167 }
98 168
169 using shstr_tmp::operator &;
170 using shstr_tmp::operator const char *;
171
172 // (note: not the copy constructor)
99 const shstr &operator =(const shstr &sh) 173 shstr &operator =(const shstr_tmp &sh)
100 { 174 {
101 --refcnt (); 175 --refcnt ();
102 s = sh.s; 176 s = sh.s;
103 ++refcnt (); 177 ++refcnt ();
104 178
105 return *this; 179 return *this;
106 } 180 }
107 181
182 // here it comes
183 shstr &operator =(const shstr &sh)
184 {
185 return (*this) = (shstr_tmp)sh;
186 }
187
188 // shstr_tmp doesn't have this one
108 const shstr &operator =(const char *str) 189 shstr &operator =(const char *str)
109 { 190 {
110 --refcnt (); 191 --refcnt ();
111 192 s = 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);
117 193
118 return *this; 194 return *this;
119 } 195 }
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}; 196};
131 197
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 198// only good for mass comparisons to shstr objects, or very
199// temporary passing, basically a non-refcounted shstr
156struct shstr_cmp 200struct shstr_cmp
157{ 201{
158 const char *s; 202 const char *s;
159 203
160 explicit shstr_cmp (const char *s) 204 explicit shstr_cmp (const char *str)
161 : s (shstr::find (s)) 205 : s (shstr::find (str))
162 { 206 {
163 } 207 }
164 208
165 shstr_cmp (const shstr_cmp &sh) 209 shstr_cmp (shstr_tmp sh)
166 : s (sh.s) 210 : s (sh.s)
167 { 211 {
168 } 212 }
169 213
170 shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } 214 // this is used for informational messages and the like
215 const char *operator &() const { return s; }
216
171 operator const char *() const { return s; } 217 operator const char *() const { return s; }
172}; 218};
173 219
174inline bool operator ==(const shstr_cmp &a, const shstr &b) 220inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
175{ 221{
176 return a.s == b.s; 222 return a.s == b.s;
177} 223}
178 224
179inline bool operator ==(const shstr &a, const shstr_cmp &b) 225inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
180{ 226{
181 return b == a; 227 return a.s == b.s;
182} 228}
183 229
184#define def(str) extern const shstr shstr_ ## str; 230#define def(str) extern const shstr shstr_ ## str;
185# include "shstrinc.h" 231# include "shstrinc.h"
186#undef def 232#undef def

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