--- deliantra/server/include/shstr.h 2007/04/23 16:07:00 1.14
+++ deliantra/server/include/shstr.h 2009/01/01 16:05:12 1.30
@@ -1,62 +1,173 @@
+/*
+ * This file is part of Deliantra, the Roguelike Realtime MMORPG.
+ *
+ * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
+ *
+ * Deliantra is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ *
+ * The authors can be reached via e-mail to
+ */
+
#ifndef SHSTR_H__
#define SHSTR_H__
+#include
#include
-#include "util.h"
+#include "traits.h"
+
+extern size_t shstr_alloc;
extern int buf_overflow (const char *buf1, const char *buf2, int bufsize);
-struct shstr
+template
+struct shstr_vec
+{
+ uint32_t len;
+ uint32_t refcnt;
+ char string[size];
+};
+
+// this class is a non-refcounted shared string
+// it cannot be used to create or store shared strings, but
+// it can be used to apss shared strings around, i.e. as function arguments
+// or return values. their lifetime must not span a gc () call, i.e.
+// they are only valid as temporary values within the same server tick.
+struct shstr_tmp
{
- static const char *null;
+ static shstr_vec nullvec;
+ static const char *null () { return nullvec.string; } // this is the null pointer value
const char *s;
- static int &refcnt (const char *s)
+ static unsigned int &length (const char *s)
{
- return *((int *)s - 1);
+ return *((unsigned int *)s - 2);
}
- static int &length (const char *s)
+ int length () const
{
- return *((int *)s - 2);
+ return length (s);
}
- int &refcnt () const
+ // returns whether this shared string begins with the given prefix,
+ // used mainly for searches when users give only the start of a name.
+ bool starts_with (const char *prefix) const
{
- return refcnt (s);
+ int plen = strlen (prefix);
+
+ return length () >= plen && !strncasecmp (s, prefix, plen);
}
- int length () const
+ bool contains (const char *substring) const
{
- return length (s);
+ return s != null () && strstr (s, substring);
}
- static const char *find (const char *s);
- static const char *intern (const char *s);
+ //TODO: case sensitive should be eradicated
+ bool eq_nc (const char *otherstring) const
+ {
+ return !strcasecmp (s, otherstring);
+ }
- static void gc (); // garbage collect a few strings
+ shstr_tmp ()
+ : s (null ())
+ {
+ }
+
+ shstr_tmp (const shstr_tmp &sh)
+ : s (sh.s)
+ {
+ }
+
+ shstr_tmp operator =(const shstr_tmp &sh)
+ {
+ s = sh.s;
+
+ return *this;
+ }
// this is used for informational messages and the like
const char *operator &() const { return s; }
- const char &operator [](int i) const { return s[i]; }
- operator const char *() const { return s == null ? 0 : s; }
+ operator const char *() const { return s == null () ? 0 : s; }
+
+protected:
+ // dummy is there so it isn't used as type converter accidentally
+ shstr_tmp (int dummy, const char *s)
+ : s(s)
+ {
+ }
+};
+
+inline bool operator ==(const shstr_tmp &a, const shstr_tmp &b)
+{
+ return a.s == b.s;
+}
+
+inline bool operator !=(const shstr_tmp &a, const shstr_tmp &b)
+{
+ return a.s != b.s;
+}
+
+inline int strlen (const shstr_tmp &sh)
+{
+ return sh.length ();
+}
+
+static std::ostream &operator <<(std::ostream &o, shstr_tmp sh)
+{
+ o.write (sh.s, sh.length ());
+
+ return o;
+}
+
+struct shstr : shstr_tmp
+{
+ static unsigned int &refcnt (const char *s)
+ {
+ return *((unsigned int *)s - 1);
+ }
+
+ unsigned int &refcnt () const
+ {
+ return refcnt (s);
+ }
shstr ()
- : s (null)
{
}
+ static const char *find (const char *s);
+ static const char *intern (const char *s);
+
+ static void gc (); // garbage collect a few strings
+
shstr (const shstr &sh)
- : s (sh.s)
+ : shstr_tmp (sh)
+ {
+ ++refcnt ();
+ }
+
+ shstr (const shstr_tmp &sh)
+ : shstr_tmp (sh)
{
++refcnt ();
}
- explicit shstr (const char *s)
- : s (intern (s))
+ explicit shstr (const char *str)
+ : shstr_tmp (0, is_constant (str) && !str ? null () : intern (str))
{
}
@@ -65,7 +176,11 @@
--refcnt ();
}
- const shstr &operator =(const shstr &sh)
+ using shstr_tmp::operator &;
+ using shstr_tmp::operator const char *;
+
+ // (note: not the copy constructor)
+ shstr &operator =(const shstr_tmp &sh)
{
--refcnt ();
s = sh.s;
@@ -74,83 +189,69 @@
return *this;
}
- const shstr &operator =(const char *str)
+ // here it comes
+ shstr &operator =(const shstr &sh)
{
- --refcnt ();
-
- // this optimises the important case of str == constant 0
- if (is_constant (str))
- s = str ? intern (str) : null;
- else
- s = intern (str);
-
- return *this;
+ return (*this) = (shstr_tmp)sh;
}
- bool operator ==(const shstr &b)
+ // shstr_tmp doesn't have this one
+ shstr &operator =(const char *str)
{
- return s == b.s;
- }
+ --refcnt ();
+ s = is_constant (str) && !str ? null () : intern (str);
- bool operator !=(const shstr &b)
- {
- return !(*this == b);
+ return *this;
}
};
-inline int strlen (const shstr &sh)
-{
- return sh.length ();
-}
-
-inline int strcmp (const shstr &a, const shstr &b)
-{
- // TODO: use this to find all the occurences of people using strcmp
- // all uses should be bogus, as we should be never interested in
- // comparing shstr's alphabetically
-#if 0
- extern void do_not_use_strcmp_to_compare_shstr_values ();
- do_not_use_strcmp_to_compare_shstr_values ();
-#endif
- return a != b;
-}
-
-static std::ostream &operator <<(std::ostream &o, const shstr &sh)
-{
- o.write (sh.s, sh.length ());
- return o;
-}
-
-// only good for mass comparisons to shstr objects
+// only good for mass comparisons to shstr objects, or very
+// temporary passing, basically a non-refcounted shstr
struct shstr_cmp
{
const char *s;
- explicit shstr_cmp (const char *s)
- : s (shstr::find (s))
+ // initialies to the non-matching string (as opposed to the null string)
+ shstr_cmp ()
+ {
+ s = 0;
+ }
+
+ shstr_cmp (const char *str)
+ : s (shstr::find (str))
{
}
- shstr_cmp (const shstr_cmp &sh)
+ shstr_cmp (shstr_tmp sh)
: s (sh.s)
{
}
- shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; }
+ // this is used for informational messages and the like
+ const char *operator &() const { return s; }
+
operator const char *() const { return s; }
};
-inline bool operator ==(const shstr_cmp &a, const shstr &b)
+inline bool operator ==(const shstr_cmp &a, const shstr_tmp &b)
{
return a.s == b.s;
}
-inline bool operator ==(const shstr &a, const shstr_cmp &b)
+inline bool operator ==(const shstr_tmp &a, const shstr_cmp &b)
{
- return b == a;
+ return a.s == b.s;
}
-extern const shstr undead_name; /* Used in hit_player() in main.c */
+#define def2(id,str) extern const shstr id;
+#define def(id) def2(shstr_ ## id, # id)
+# include "shstrinc.h"
+#undef def
+#undef def2
+
+// undefined external reference to catch people using str* functions when they shouldn't
+//template void strcmp (const shstr_tmp &a, any b);
+template void strstr (const shstr_tmp &a, any b);
#endif