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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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#ifndef SHSTR_H__ |
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#define SHSTR_H__ |
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#include <cstring> |
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#include <sstream> |
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#include "traits.h" |
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extern size_t shstr_alloc; |
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extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); |
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template<int size> |
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struct shstr_vec |
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{ |
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uint32_t len; |
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uint32_t refcnt; |
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char string[size]; |
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}; |
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// this class is a non-refcounted shared string |
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// it cannot be used to create or store shared strings, but |
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// it can be used to apss shared strings around, i.e. as function arguments |
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// or return values. their lifetime must not span a gc () call, i.e. |
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// they are only valid as temporary values within the same server tick. |
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struct shstr_tmp |
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{ |
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static shstr_vec<sizeof ("(null)")> nullvec; |
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static const char *null () { return nullvec.string; } // this is the null pointer value |
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const char *s; |
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static unsigned int &length (const char *s) |
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{ |
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return *((unsigned int *)s - 2); |
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} |
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int length () const |
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{ |
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return length (s); |
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} |
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// returns whether this shared string begins with the given prefix, |
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// used mainly for searches when users give only the start of a name. |
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bool starts_with (const char *prefix) const |
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{ |
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int plen = strlen (prefix); |
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return length () >= plen && !strncasecmp (s, prefix, plen); |
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} |
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bool contains (const char *substring) const |
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{ |
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return strstr (s, substring); |
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} |
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shstr_tmp () |
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: s (null ()) |
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{ |
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} |
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shstr_tmp (const shstr_tmp &sh) |
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: s (sh.s) |
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{ |
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} |
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shstr_tmp operator =(const shstr_tmp &sh) |
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{ |
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s = sh.s; |
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return *this; |
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} |
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// this is used for informational messages and the like |
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const char *operator &() const { return s; } |
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operator const char *() const { return s == null () ? 0 : s; } |
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protected: |
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// dummy is there so it isn't used as type converter accidentally |
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shstr_tmp (int dummy, const char *s) |
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: s(s) |
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{ |
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} |
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}; |
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inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b) |
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{ |
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return a.s == b.s; |
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} |
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inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b) |
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{ |
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return a.s != b.s; |
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} |
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inline int strlen (const shstr_tmp &sh) |
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{ |
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return sh.length (); |
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} |
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// undefined external reference to catch people using strcmp when they shouldn't |
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int strcmp (const shstr_tmp &a, const shstr_tmp &b); |
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static std::ostream &operator <<(std::ostream &o, shstr_tmp sh) |
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{ |
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o.write (sh.s, sh.length ()); |
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return o; |
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} |
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struct shstr : shstr_tmp |
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{ |
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static unsigned int &refcnt (const char *s) |
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{ |
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return *((unsigned int *)s - 1); |
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} |
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unsigned int &refcnt () const |
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{ |
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return refcnt (s); |
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} |
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shstr () |
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{ |
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} |
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static const char *find (const char *s); |
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static const char *intern (const char *s); |
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static void gc (); // garbage collect a few strings |
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shstr (const shstr &sh) |
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: shstr_tmp (sh) |
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{ |
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++refcnt (); |
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} |
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shstr (const shstr_tmp &sh) |
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: shstr_tmp (sh) |
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{ |
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++refcnt (); |
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} |
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explicit shstr (const char *str) |
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: shstr_tmp (0, is_constant (str) && !str ? null () : intern (str)) |
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{ |
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} |
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~shstr () |
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{ |
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--refcnt (); |
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} |
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using shstr_tmp::operator &; |
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using shstr_tmp::operator const char *; |
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// (note: not the copy constructor) |
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shstr &operator =(const shstr_tmp &sh) |
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{ |
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--refcnt (); |
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s = sh.s; |
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++refcnt (); |
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return *this; |
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} |
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// here it comes |
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shstr &operator =(const shstr &sh) |
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{ |
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return (*this) = (shstr_tmp)sh; |
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} |
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// shstr_tmp doesn't have this one |
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shstr &operator =(const char *str) |
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{ |
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--refcnt (); |
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s = is_constant (str) && !str ? null () : intern (str); |
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return *this; |
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} |
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}; |
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// only good for mass comparisons to shstr objects, or very |
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// temporary passing, basically a non-refcounted shstr |
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struct shstr_cmp |
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{ |
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const char *s; |
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explicit shstr_cmp (const char *str) |
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: s (shstr::find (str)) |
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{ |
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} |
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shstr_cmp (shstr_tmp sh) |
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: s (sh.s) |
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{ |
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} |
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// this is used for informational messages and the like |
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const char *operator &() const { return s; } |
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operator const char *() const { return s; } |
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}; |
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inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b) |
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{ |
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return a.s == b.s; |
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} |
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inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b) |
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{ |
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return a.s == b.s; |
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} |
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#define def(str) extern const shstr shstr_ ## str; |
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# include "shstrinc.h" |
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#undef def |
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#endif |
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