--- rxvt-unicode/src/rxvtutil.h	2005/11/28 19:35:04	1.10
+++ rxvt-unicode/src/rxvtutil.h	2006/01/29 20:51:28	1.21
@@ -1,8 +1,14 @@
 #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)
+
 extern class byteorder {
   static unsigned int e; // at least 32 bits
 public:
@@ -14,16 +20,34 @@
   static bool vax           () { return e == 0x44332211; };
 } byteorder;
 
-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 T max (T a, U b) { return a > (T)b ? a : (T)b; }
-template<typename T>
-static inline void swap (T& a, T& b) { T t=a; a=b; b=t; }
+// 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;
+}
 
-#define IN_RANGE(val,beg,end) \
+// 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);
@@ -243,14 +267,14 @@
     void erase (iterator first, iterator last)
     {
         if (last != first) {
-            memmove (first, last, (end ()-last)*sizeof (T));
+            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;
         }
     }
@@ -378,9 +402,19 @@
   ~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