--- rxvt-unicode/src/misc.C	2004/12/12 06:30:25	1.19
+++ rxvt-unicode/src/misc.C	2004/12/13 07:26:18	1.21
@@ -103,16 +103,21 @@
 {
   if (len < 0) len = strlen (str);
 
-  wchar_t *r = (wchar_t *)rxvt_malloc ((len + 1) * sizeof (wchar_t));
-  wchar_t *p = r;
+  wchar_t *r = (wchar_t *)rxvt_malloc ((len + 1) * sizeof (wchar_t)),
+          *p = r;
 
-  unsigned char *s = (unsigned char *)str;
+  unsigned char *s = (unsigned char *)str,
+                *e = s + len;
 
-  while (len--)
+  for (;;)
     {
-      if (s[0] < 0x80)
+      len = e - s;
+
+      if (len == 0)
+        break;
+      else if (s[0] < 0x80)
         *p++ = *s++;
-      else if (len > 0 
+      else if (len >= 2
                && s[0] >= 0xc2 && s[0] <= 0xdf 
                && (s[1] & 0xc0) == 0x80)
         {
@@ -120,7 +125,7 @@
                |  (s[1] & 0x3f);
           s += 2;
         }
-      else if (len > 1 
+      else if (len >= 3
                && (   (s[0] == 0xe0                 && s[1] >= 0xa0 && s[1] <= 0xbf)
                    || (s[0] >= 0xe1 && s[0] <= 0xec && s[1] >= 0x80 && s[1] <= 0xbf)
                    || (s[0] == 0xed                 && s[1] >= 0x80 && s[1] <= 0x9f)
@@ -133,7 +138,7 @@
                |  (s[2] & 0x3f);
           s += 3;
         }
-      else if (len > 2
+      else if (len >= 4
                && (   (s[0] == 0xf0                 && s[1] >= 0x90 && s[1] <= 0xbf)
                    || (s[0] >= 0xf1 && s[0] <= 0xf3 && s[1] >= 0x80 && s[1] <= 0xbf)
                    || (s[0] == 0xf4                 && s[1] >= 0x80 && s[1] <= 0x8f)