--- rxvt-unicode/src/rxvtutil.h	2004/09/02 07:44:40	1.4
+++ rxvt-unicode/src/rxvtutil.h	2006/01/29 22:30:21	1.23
@@ -1,8 +1,17 @@
 #ifndef RXVT_UTIL_H
 #define RXVT_UTIL_H
 
+#include <cstdlib>
 #include <cstring>
 
+#define PP_CONCAT_(a, b) a ## b
+#define PP_CONCAT(a, b) PP_CONCAT_(a, b)
+#define PP_STRINGIFY_(a) #a
+#define PP_STRINGIFY(a) PP_STRINGIFY_(a)
+
+// actually, some gcc-3.x versions work, too
+#define HAVE_GCC_BUILTINS (__GNUC__ >= 4)
+
 extern class byteorder {
   static unsigned int e; // at least 32 bits
 public:
@@ -14,11 +23,44 @@
   static bool vax           () { return e == 0x44332211; };
 } byteorder;
 
-template<typename T, typename U>
-static inline T min (T a, U b) { return a < b ? a : (T)b; }
-template<typename T, typename U>
-static inline T max (T a, U b) { return a > b ? a : (T)b; }
+// various utility functions
+template<typename T, typename U> static inline T    min    (T  a, U b) { return a < (T)b ? a : (T)b; }
+template<typename T, typename U> static inline void min_it (T &a, U b) {    a = a < (T)b ? a : (T)b; }
+template<typename T, typename U> static inline T    max    (T  a, U b) { return a > (T)b ? a : (T)b; }
+template<typename T, typename U> static inline void max_it (T &a, U b) {    a = a > (T)b ? a : (T)b; }
+
+template<typename T, typename U, typename V> static inline T    clamp    (T  v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; }
+template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) {    v = v < (T)a ? a : v >(T)b ? b : v; }
+
+template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
+
+// linear interpolation
+template<typename T, typename U, typename P>
+static inline
+T lerp (T a, U b, P p)
+{
+  return (int(a) * int(p) + int(b) * int(100 - p)) / 100;
+}
+
+// some bit functions, xft fuck me plenty
+#if HAVE_GCC_BUILTINS
+static inline int ctz      (unsigned int x) { return __builtin_ctz      (x); }
+static inline int popcount (unsigned int x) { return __builtin_popcount (x); }
+#else
+// count trailing zero bits and count # of one bits
+int ctz      (unsigned int x);
+int popcount (unsigned int x);
+#endif
 
+// in range including end
+#define IN_RANGE_INC(val,beg,end) \
+  ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
+
+// in range excluding end
+#define IN_RANGE_EXC(val,beg,end) \
+  ((unsigned int)(val) - (unsigned int)(beg) <  (unsigned int)(end) - (unsigned int)(beg))
+
+// makes dynamically allocated objects zero-initialised
 struct zero_initialized {
   void *operator new (size_t s);
   void operator delete (void *p, size_t s);
@@ -42,72 +84,72 @@
 public:
     const_iterator begin () const
     {
-	return &_buf[0];
+        return &_buf[0];
     }
     iterator begin ()
     {
-	return &_buf[0];
+        return &_buf[0];
     }
     const_iterator end () const
     {
-	return &_buf[_last];
+        return &_buf[_last];
     }
     iterator end ()
     {
-	return &_buf[_last];
+        return &_buf[_last];
     }
     size_type capacity () const
     {
-	return _size;
+        return _size;
     }
     size_type size () const
     {
-	return _last;
+        return _last;
     }
 
 private:
     static T *alloc (size_type n)
     {
-	return (T *)::operator new ((size_t) (n * sizeof (T)));
+        return (T *)::operator new ((size_t) (n * sizeof (T)));
     }
     static void dealloc (T *buf)
     {
-	if (buf)
-	    ::operator delete (buf);
+        if (buf)
+            ::operator delete (buf);
     }
 
     void reserve (iterator where, size_type n)
     {
-	if (_last + n <= _size) {
-	    memmove (where+n, where, (end ()-where)*sizeof (T));
-	} else {
-	    size_type sz = _last+n;
-	    sz = (_size == 0) ? max (sz, 5) : max (sz, 2*_size);
-	    T *nbuf = alloc (sz);
-	    if (_buf) {
-		memcpy (nbuf, begin (), (where-begin ())*sizeof (T));
-		memcpy (nbuf + (where-begin ()) + n, where,
-			(end ()-where)*sizeof (T));
-		dealloc (_buf);
-	    }
-	    _buf = nbuf;
-	    _size = sz;
-	}
+        if (_last + n <= _size) {
+            memmove (where+n, where, (end ()-where)*sizeof (T));
+        } else {
+            size_type sz = _last+n;
+            sz = (_size == 0) ? max (sz, 5) : max (sz, 2*_size);
+            T *nbuf = alloc (sz);
+            if (_buf) {
+                memcpy (nbuf, begin (), (where-begin ())*sizeof (T));
+                memcpy (nbuf + (where-begin ()) + n, where,
+                        (end ()-where)*sizeof (T));
+                dealloc (_buf);
+            }
+            _buf = nbuf;
+            _size = sz;
+        }
     }
 
 public:
     void reserve (size_type sz)
     {
-	if (_size < sz) {
-	    sz = (_size == 0) ? max (sz, 5) : max (sz, 2*_size);
-	    T *nbuf = alloc (sz);
-	    if (_buf) {
-		memcpy (nbuf, begin (), size ()*sizeof (T));
-		dealloc (_buf);
-	    }
-	    _buf = nbuf;
-	    _size = sz;
-	}
+        if (_size < sz) {
+            sz = (_size == 0) ? max (sz, 5) : max (sz, 2*_size);
+            T *nbuf = alloc (sz);
+            if (_buf) {
+                memcpy (nbuf, begin (), size ()*sizeof (T));
+                dealloc (_buf);
+            }
+            _buf = nbuf;
+            _size = sz;
+        }
     }
     simplevec ()
     : _last(0), _size(0), _buf(0)
@@ -116,146 +158,152 @@
     simplevec (size_type n, const T& t = T ())
     : _last(0), _size(0), _buf(0)
     {
-	insert (begin (), n, t);
+        insert (begin (), n, t);
     }
     simplevec (const_iterator first, const_iterator last)
     : _last(0), _size(0), _buf(0)
     {
-	insert (begin (), first, last);
+        insert (begin (), first, last);
     }
     simplevec (const simplevec<T> &v)
     : _last(0), _size(0), _buf(0)
     {
-	reserve (v._last);
-	memcpy (_buf, v.begin (), v.size ()*sizeof (T));
-	_last = v._last;
+        reserve (v._last);
+        memcpy (_buf, v.begin (), v.size ()*sizeof (T));
+        _last = v._last;
     }
     simplevec<T> &operator= (const simplevec<T> &v)
     {
-	if (this != &v) {
-	    _last = 0;
-	    reserve (v._last);
-	    memcpy (_buf, v.begin (), v.size ()*sizeof (T));
-	    _last = v._last;
-	}
+        if (this != &v) {
+            _last = 0;
+            reserve (v._last);
+            memcpy (_buf, v.begin (), v.size ()*sizeof (T));
+            _last = v._last;
+        }
         return *this;
     }
     ~simplevec ()
     {
-	dealloc (_buf);
+        dealloc (_buf);
     }
     const T &front () const
     {
-	//ministl_assert (size () > 0);
-	return _buf[0];
+        //ministl_assert (size () > 0);
+        return _buf[0];
     }
     T &front ()
     {
-	//ministl_assert (size () > 0);
-	return _buf[0];
+        //ministl_assert (size () > 0);
+        return _buf[0];
     }
     const T &back () const
     {
-	//ministl_assert (size () > 0);
-	return _buf[_last-1];
+        //ministl_assert (size () > 0);
+        return _buf[_last-1];
     }
     T &back ()
     {
-	//ministl_assert (size () > 0);
-	return _buf[_last-1];
+        //ministl_assert (size () > 0);
+        return _buf[_last-1];
     }
     bool empty () const
     {
-	return _last == 0;
+        return _last == 0;
     }
     void clear ()
     {
-	_last = 0;
+        _last = 0;
     }
     void push_back (const T &t)
     {
-	reserve (_last+1);
-	*end () = t;
-	++_last;
+        reserve (_last+1);
+        *end () = t;
+        ++_last;
     }
     void push_back (T &t)
     {
-	reserve (_last+1);
-	*end () = t;
-	++_last;
+        reserve (_last+1);
+        *end () = t;
+        ++_last;
     }
     void pop_back ()
     {
-	//ministl_assert (size () > 0);
-	--_last;
+        //ministl_assert (size () > 0);
+        --_last;
     }
     const T &operator[] (size_type idx) const
     {
-	//ministl_assert (idx < size ());
-	return _buf[idx];
+        //ministl_assert (idx < size ());
+        return _buf[idx];
     }
     T &operator[] (size_type idx)
     {
-	//ministl_assert (idx < size ());
-	return _buf[idx];
+        //ministl_assert (idx < size ());
+        return _buf[idx];
     }
     iterator insert (iterator pos, const T &t)
     {
-	//ministl_assert (pos <= end ());
-	long at = pos - begin ();
-	reserve (pos, 1);
-	pos = begin ()+at;
-	*pos = t;
-	++_last;
-	return pos;
+        //ministl_assert (pos <= end ());
+        long at = pos - begin ();
+        reserve (pos, 1);
+        pos = begin ()+at;
+        *pos = t;
+        ++_last;
+        return pos;
     }
     iterator insert (iterator pos, const_iterator first, const_iterator last)
     {
         //ministl_assert (pos <= end ());
-	long n = last - first;
-	long at = pos - begin ();
-	if (n > 0) {
-	    reserve (pos, n);
-	    pos = begin ()+at;
-	    memcpy (pos, first, (last-first)*sizeof (T));
-	    _last += n;
-	}
-	return pos;
+        long n = last - first;
+        long at = pos - begin ();
+        if (n > 0) {
+            reserve (pos, n);
+            pos = begin ()+at;
+            memcpy (pos, first, (last-first)*sizeof (T));
+            _last += n;
+        }
+        return pos;
     }
     iterator insert (iterator pos, size_type n, const T &t)
     {
         //ministl_assert (pos <= end ());
-	long at = pos - begin ();
-	if (n > 0) {
-	    reserve (pos, n);
-	    pos = begin ()+at;
-	    for (int i = 0; i < n; ++i)
-		pos[i] = t;
-	    _last += n;
-	}
-	return pos;
+        long at = pos - begin ();
+        if (n > 0) {
+            reserve (pos, n);
+            pos = begin ()+at;
+            for (int i = 0; i < n; ++i)
+                pos[i] = t;
+            _last += n;
+        }
+        return pos;
     }
     void erase (iterator first, iterator last)
     {
-	if (last != first) {
-	    memmove (first, last, (end ()-last)*sizeof (T));
-	    _last -= last - first;
-	}
+        if (last != first) {
+            memmove (first, last, (end () - last) * sizeof (T));
+            _last -= last - first;
+        }
     }
     void erase (iterator pos)
     {
         if (pos != end ()) {
-	    memmove (pos, pos+1, (end ()- (pos+1))*sizeof (T));
+            memmove (pos, pos+1, (end () - (pos+1)) * sizeof (T));
             --_last;
         }
     }
+    void swap (simplevec<T> &t)
+    {
+        ::swap(_last, t._last);
+        ::swap(_size, t._size);
+        ::swap(_buf, t._buf);
+    }
 };
 
 template<class T>
 bool operator== (const simplevec<T> &v1, const simplevec<T> &v2)
 {
     if (v1.size () != v2.size ())
-	return false;
+        return false;
     return !v1.size () || !memcmp (&v1[0], &v2[0], v1.size ()*sizeof (T));
 }
 
@@ -265,9 +313,9 @@
     unsigned long minlast = min (v1.size (), v2.size ());
     for (unsigned long i = 0; i < minlast; ++i) {
         if (v1[i] < v2[i])
-	    return true;
-	if (v2[i] < v1[i])
-	    return false;
+            return true;
+        if (v2[i] < v1[i])
+            return false;
     }
     return v1.size () < v2.size ();
 }
@@ -367,9 +415,19 @@
   ~stringvec ()
   {
     for (char **c = begin (); c != end (); c++)
-      delete [] *c;
+      free (*c);
   }
 };
 
+// return a very temporary (and never deallocated) buffer. keep small.
+void *rxvt_temp_buf (int len);
+
+template<typename T>
+inline T *
+rxvt_temp_buf (int len)
+{
+  return (T *)rxvt_temp_buf (len * sizeof (T));
+}
+
 #endif