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/* |
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* This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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* |
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* Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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* |
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* Deliantra is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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* The authors can be reached via e-mail to <support@deliantra.net> |
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*/ |
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|
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/* |
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* shstr.C |
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*/ |
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|
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#include <cstring> |
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#include <cstdlib> |
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#include <glib.h> |
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#include <tr1/unordered_set> |
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|
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#include "global.h" |
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|
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size_t shstr_alloc; |
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|
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typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *> > HT; |
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|
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static HT ht; |
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static int next_gc; |
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|
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static const char * |
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makevec (const char *s) |
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{ |
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int len = strlen (s); |
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|
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shstr_alloc += sizeof (unsigned int) * 2 + len + 1; |
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const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (unsigned int) * 2 + len + 1)); |
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|
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shstr::length (v) = len; |
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shstr::refcnt (v) = 1; |
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|
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memcpy ((char *) v, s, len + 1); |
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|
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return v; |
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} |
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|
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static const char * |
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makenull () |
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{ |
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const char *s = makevec ("(null)"); |
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shstr_tmp::length (s) = 0; |
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//shstr ::refcnt (s) = 0xffffffff; // useful for debugging |
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return s; |
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} |
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|
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const char *shstr_tmp::null = makenull (); |
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|
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const char * |
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shstr::find (const char *s) |
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{ |
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if (!s) |
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return s; |
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|
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auto (i, ht.find (s)); |
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|
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return i != ht.end ()? *i : 0; |
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} |
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|
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const char * |
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shstr::intern (const char *s) |
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{ |
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if (!s) |
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return null; |
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|
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if (const char *found = find (s)) |
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{ |
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++refcnt (found); |
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return found; |
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} |
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|
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--next_gc; |
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s = makevec (s); |
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ht.insert (s); |
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return s; |
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} |
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|
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// periodically test refcounts == 0 for a few strings |
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// this is the ONLY thing that erases stuff from ht. keep it that way. |
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void |
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shstr::gc () |
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{ |
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if (expect_true (next_gc > 0)) |
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return; |
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|
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static const char *curpos; |
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|
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auto (i, curpos ? ht.find (curpos) : ht.begin ()); |
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|
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if (i == ht.end ()) |
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i = ht.begin (); |
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|
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int n = ht.size () / 256 + 16; |
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next_gc += n >> 1; |
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|
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for (;;) |
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{ |
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if (i == ht.end ()) |
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{ |
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curpos = 0; |
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return; |
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} |
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else if (!--n) |
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break; |
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else if (!refcnt (*i)) |
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{ |
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auto (o, i++); |
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const char *s = *o; |
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|
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ht.erase (o); |
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|
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//printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
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shstr_alloc -= sizeof (unsigned int) * 2 + length (s) + 1; |
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g_slice_free1 (sizeof (unsigned int) * 2 + length (s) + 1, -2 + (int *) s); |
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} |
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else |
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++i; |
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} |
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|
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curpos = *i; |
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} |
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|
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const shstr shstr_null; |
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|
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// declare these here to get correct initialisation order |
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#define def(str) const shstr shstr_ ## str (# str); |
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# include "shstrinc.h" |
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#undef def |
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|
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shstr skill_names[NUM_SKILLS]; |
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|
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//TODO: this should of course not be here |
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|
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/* buf_overflow() - we don't want to exceed the buffer size of |
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* buf1 by adding on buf2! Returns true if overflow will occur. |
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*/ |
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int |
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buf_overflow (const char *buf1, const char *buf2, int bufsize) |
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{ |
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int len1 = 0, len2 = 0; |
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|
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if (buf1) |
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len1 = strlen (buf1); |
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|
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if (buf2) |
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len2 = strlen (buf2); |
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|
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if ((len1 + len2) >= bufsize) |
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return 1; |
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|
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return 0; |
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} |
