|
|
1 | /* |
|
|
2 | * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. |
|
|
3 | * |
|
|
4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
|
|
5 | * |
|
|
6 | * Crossfire TRT is free software; you can redistribute it and/or modify it |
|
|
7 | * under the terms of the GNU General Public License as published by the Free |
|
|
8 | * Software Foundation; either version 2 of the License, or (at your option) |
|
|
9 | * any later version. |
|
|
10 | * |
|
|
11 | * This program is distributed in the hope that it will be useful, but |
|
|
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
|
|
13 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
|
14 | * for more details. |
|
|
15 | * |
|
|
16 | * You should have received a copy of the GNU General Public License along |
|
|
17 | * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 |
|
|
18 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
|
19 | * |
|
|
20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
|
|
21 | */ |
|
|
22 | |
1 | /* |
23 | /* |
2 | * shstr.C |
24 | * shstr.C |
3 | */ |
25 | */ |
4 | |
26 | |
5 | #include <cstring> |
27 | #include <cstring> |
6 | #include <cstdlib> |
28 | #include <cstdlib> |
7 | |
29 | #include <glib.h> |
8 | #include <tr1/unordered_set> |
30 | #include <tr1/unordered_set> |
9 | |
31 | |
10 | #include "shstr.h" |
32 | #include "global.h" |
11 | |
33 | |
12 | // NOTE: even with lots of stuff loaded, we do not usually have >>20000 strings. |
34 | typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *>, true> HT; |
13 | // maybe refcounting is just overhead? |
|
|
14 | |
|
|
15 | struct hash |
|
|
16 | { |
|
|
17 | std::size_t operator ()(const char *s) const |
|
|
18 | { |
|
|
19 | unsigned long hash = 0; |
|
|
20 | unsigned int i = 0; |
|
|
21 | |
|
|
22 | /* use the one-at-a-time hash function, which supposedly is |
|
|
23 | * better than the djb2-like one used by perl5.005, but |
|
|
24 | * certainly is better then the bug used here before. |
|
|
25 | * see http://burtleburtle.net/bob/hash/doobs.html |
|
|
26 | */ |
|
|
27 | while (*s) |
|
|
28 | { |
|
|
29 | hash += *s++; |
|
|
30 | hash += hash << 10; |
|
|
31 | hash ^= hash >> 6; |
|
|
32 | } |
|
|
33 | |
|
|
34 | hash += hash << 3; |
|
|
35 | hash ^= hash >> 11; |
|
|
36 | hash += hash << 15; |
|
|
37 | |
|
|
38 | return hash; |
|
|
39 | } |
|
|
40 | }; |
|
|
41 | |
|
|
42 | struct equal |
|
|
43 | { |
|
|
44 | bool operator ()(const char *a, const char *b) const |
|
|
45 | { |
|
|
46 | return !strcmp (a, b); |
|
|
47 | } |
|
|
48 | }; |
|
|
49 | |
|
|
50 | typedef std::tr1::unordered_set<const char *, hash, equal> HT; |
|
|
51 | |
35 | |
52 | static HT ht; |
36 | static HT ht; |
|
|
37 | |
|
|
38 | static const char * |
|
|
39 | makevec (const char *s) |
|
|
40 | { |
|
|
41 | int len = strlen (s); |
|
|
42 | |
|
|
43 | const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (int) * 2 + len + 1)); |
|
|
44 | |
|
|
45 | shstr::length (v) = len; |
|
|
46 | shstr::refcnt (v) = 1; |
|
|
47 | |
|
|
48 | memcpy ((char *) v, s, len + 1); |
|
|
49 | |
|
|
50 | return v; |
|
|
51 | } |
|
|
52 | |
|
|
53 | static const char * |
|
|
54 | makenull () |
|
|
55 | { |
|
|
56 | const char *s = makevec ("(null)"); |
|
|
57 | shstr::length (s) = 0; |
|
|
58 | return s; |
|
|
59 | } |
|
|
60 | |
|
|
61 | const char *shstr::null = makenull (); |
53 | |
62 | |
54 | const char * |
63 | const char * |
55 | shstr::find (const char *s) |
64 | shstr::find (const char *s) |
56 | { |
65 | { |
57 | if (!s) |
66 | if (!s) |
58 | return s; |
67 | return s; |
59 | |
68 | |
60 | HT::iterator i = ht.find (s); |
69 | auto (i, ht.find (s)); |
61 | |
70 | |
62 | return i != ht.end () |
71 | return i != ht.end ()? *i : 0; |
63 | ? *i |
|
|
64 | : 0; |
|
|
65 | } |
72 | } |
66 | |
73 | |
67 | const char * |
74 | const char * |
68 | shstr::intern (const char *s) |
75 | shstr::intern (const char *s) |
69 | { |
76 | { |
70 | if (!s) |
77 | if (!s) |
71 | return s; |
78 | return null; |
72 | |
79 | |
73 | if (const char *found = find (s)) |
80 | if (const char *found = find (s)) |
74 | { |
81 | { |
75 | ++refcnt (found); |
82 | ++refcnt (found); |
76 | return found; |
83 | return found; |
77 | } |
84 | } |
78 | |
85 | |
79 | int len = strlen (s); |
86 | s = makevec (s); |
80 | |
|
|
81 | const char *v = (const char *)(2 + (int *)malloc (sizeof (int) * 2 + len + 1)); |
|
|
82 | |
|
|
83 | length (v) = len; |
|
|
84 | refcnt (v) = 1; |
|
|
85 | |
|
|
86 | memcpy ((char *)v, s, len + 1); |
|
|
87 | |
|
|
88 | ht.insert (v); |
87 | ht.insert (s); |
89 | |
|
|
90 | return v; |
88 | return s; |
91 | } |
89 | } |
92 | |
90 | |
93 | // periodically test refcounts == 0 for a few strings |
91 | // periodically test refcounts == 0 for a few strings |
94 | // this is the ONLY thing that erases stuff from ht. keep it that way. |
92 | // this is the ONLY thing that erases stuff from ht. keep it that way. |
95 | void |
93 | void |
96 | shstr::gc () |
94 | shstr::gc () |
97 | { |
95 | { |
98 | static const char *curpos; |
96 | static const char *curpos; |
99 | |
97 | |
100 | HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); |
98 | auto (i, curpos ? ht.find (curpos) : ht.begin ()); |
101 | |
99 | |
102 | if (i == ht.end ()) |
100 | if (i == ht.end ()) |
103 | i = ht.begin (); |
101 | i = ht.begin (); |
104 | |
102 | |
105 | // go through all strings roughly once every 4 minutes |
103 | // go through all strings roughly once every 4 minutes |
… | |
… | |
114 | } |
112 | } |
115 | else if (!--n) |
113 | else if (!--n) |
116 | break; |
114 | break; |
117 | else if (!refcnt (*i)) |
115 | else if (!refcnt (*i)) |
118 | { |
116 | { |
119 | HT::iterator o = i++; |
117 | auto (o, i++); |
120 | const char *s = *o; |
118 | const char *s = *o; |
|
|
119 | |
121 | ht.erase (o); |
120 | ht.erase (o); |
122 | |
121 | |
123 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
122 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
124 | free (-2 + (int *)s); |
123 | g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s); |
125 | } |
124 | } |
126 | else |
125 | else |
127 | ++i; |
126 | ++i; |
128 | } |
127 | } |
129 | |
128 | |
130 | curpos = *i; |
129 | curpos = *i; |
131 | } |
130 | } |
132 | |
131 | |
|
|
132 | shstr skill_names[NUM_SKILLS]; |
|
|
133 | |
|
|
134 | // what weird misoptimisation is this again? |
|
|
135 | const shstr undead_name ("undead"); |
|
|
136 | |
133 | //TODO: this should of course not be here |
137 | //TODO: this should of course not be here |
|
|
138 | |
134 | /* buf_overflow() - we don't want to exceed the buffer size of |
139 | /* buf_overflow() - we don't want to exceed the buffer size of |
135 | * buf1 by adding on buf2! Returns true if overflow will occur. |
140 | * buf1 by adding on buf2! Returns true if overflow will occur. |
136 | */ |
141 | */ |
137 | |
|
|
138 | int |
142 | int |
139 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
143 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
140 | { |
144 | { |
141 | int len1 = 0, len2 = 0; |
145 | int len1 = 0, len2 = 0; |
142 | |
146 | |
143 | if (buf1) |
147 | if (buf1) |
144 | len1 = strlen (buf1); |
148 | len1 = strlen (buf1); |
145 | if (buf2) |
149 | if (buf2) |
146 | len2 = strlen (buf2); |
150 | len2 = strlen (buf2); |
147 | if ((len1 + len2) >= bufsize) |
151 | if ((len1 + len2) >= bufsize) |
148 | return 1; |
|
|
149 | return 0; |
152 | return 1; |
|
|
153 | |
|
|
154 | return 0; |
150 | } |
155 | } |
151 | |
|
|