Unicode(UTF-8) support for GNU Screen's OSC/AKA/hardstatus.

screen-osc-utf8.diff

diff --git a/src/ansi.c b/src/ansi.c
index d88e153..fc42a0a 100644
--- a/src/ansi.c
+++ b/src/ansi.c
@@ -1493,8 +1493,24 @@ int c;
 {
   if (curr->w_stringp >= curr->w_string + MAXSTR - 1)
     curr->w_state = LIT;
+# ifdef UTF8
+  else if (c < 0x80)
+    *(curr->w_stringp)++ = c;
+  else if (c < 0x800) 
+    {
+      *(curr->w_stringp)++ = (c >> 6) | 0xc0;   
+      *(curr->w_stringp)++ = (c & 0x3f) | 0xc0;   
+    } 
+  else /* if (c < 0x10000) */
+    {
+      *(curr->w_stringp)++ = (c >> 12) | 0xe0;   
+      *(curr->w_stringp)++ = (c >> 6) & 0x3f | 0x80;   
+      *(curr->w_stringp)++ = (c & 0x3f) | 0x80;   
+    } 
+# else
   else
     *(curr->w_stringp)++ = c;
+# endif
 }
 
 /*
@@ -1605,7 +1621,7 @@ StringEnd()
 	}
       return -1;
     case DCS:
-      LAY_DISPLAYS(&curr->w_layer, AddStr(curr->w_string));
+      LAY_DISPLAYS(&curr->w_layer, AddRawStr(curr->w_string));
       break;
     case AKA:
       if (curr->w_title == curr->w_akabuf && !*curr->w_string)
@@ -2239,7 +2255,11 @@ int l;
       c = (unsigned char)*s++;
       if (c == 0)
 	break;
+#ifdef UTF8
+      if (c < 32)
+#else
       if (c < 32 || c == 127 || (c >= 128 && c < 160 && p->w_c1))
+#endif
 	continue;
       p->w_akachange[i++] = c;
     }
diff --git a/src/display.c b/src/display.c
index 94c05f1..85f4cd8 100644
--- a/src/display.c
+++ b/src/display.c
@@ -2885,7 +2885,7 @@ char *s;
   D_xtermosc[i] = 1;
   AddStr("\033]");
   AddStr(oscs[i][0]);
-  AddStr(s);
+  AddRawStr(s);
   AddChar(7);
 }
 
@@ -2926,6 +2926,18 @@ char *str;
 }
 
 void
+AddRawStr(str)
+char *str;
+{
+  register char c;
+
+  ASSERT(display);
+
+  while ((c = *str++))
+    AddChar(c);
+}
+
+void
 AddStrn(str, n)
 char *str;
 int n;
diff --git a/src/layer.c b/src/layer.c
index 1ae7972..9982a2f 100644
--- a/src/layer.c
+++ b/src/layer.c
@@ -439,6 +439,7 @@ int x, y;
   struct viewport *vp;
   int xs2, xe2, y2, len, len2;
   struct mchar or;
+  int i;
 
   if (x + n > l->l_width)
     n = l->l_width - x;
@@ -473,18 +474,15 @@ int x, y;
 	  continue;
 	GotoPos(xs2, y2);
 	SetRendition(r);
+	for (i = xs2; i <= xe2; ++i)
+	  PUTCHARLP(' ');
+
+	GotoPos(xs2, y2);
+	SetRendition(r);
 	len2 = xe2 - (x + vp->v_xoff) + 1;
 	if (len2 > len)
 	  len2 = len;
 	PutWinMsg(s, xs2 - x - vp->v_xoff, len2);
-	xs2 = x + vp->v_xoff + len2;
-	if (xs2 < vp->v_xs)
-	  xs2 = vp->v_xs;
-	or = D_rend;
-	GotoPos(xs2, y2);
-	SetRendition(&or);
-	while (xs2++ <= xe2)
-	  PUTCHARLP(' ');
       }
   );
 }
diff --git a/src/screen.c b/src/screen.c
index 949df01..1f8909f 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -3080,8 +3080,32 @@ int start, max;
 	    {
 	      if (start-- > 0)
 		s++;
-	      else
+#ifdef UTF8
+	      else if ((unsigned char)*s < 0x80) 
+	        {
+	          PUTCHARLP(*s++);
+	        }
+	      else if ((unsigned char)*s < 0xe0) 
+	        {
+	          int first = (*s++ & 0x1f) << 6;
+	          int second = *s++ & 0x3f;
+	          AddUtf8(first | second);
+                  n -= 1;
+                  start -= 1;
+	        }
+	      else /* if (*s2 < 0xf0) */
+	        {
+	          int first = (*s++ & 0x1f) << 12;
+	          int second = (*s++ & 0x3f) << 6;
+	          int third = *s++ & 0x3f;
+	          AddUtf8(first | second | third);
+                  n -= 2;
+                  start -= 2;
+	        }
+#else
+	      else 
 	        PUTCHARLP(*s++);
+#endif
 	    }
 	}
       r = winmsg_rend[i];
@@ -3106,8 +3130,32 @@ int start, max;
 	{
 	  if (start-- > 0)
 	    s++;
-	  else
+#ifdef UTF8
+	  else if ((unsigned char)*s < 0x80) 
+	    {
+	      PUTCHARLP(*s++);
+	    }
+	  else if ((unsigned char)*s < 0xe0) 
+	    {
+	      int first = (*s++ & 0x1f) << 6;
+	      int second = *s++ & 0x3f;
+	      AddUtf8(first | second);
+              n -= 1;
+              start -= 1;
+	    }
+	  else /* if (*s2 < 0xf0) */
+	    {
+	      int first = (*s++ & 0x1f) << 12;
+	      int second = (*s++ & 0x3f) << 6;
+	      int third = *s++ & 0x3f;
+	      AddUtf8(first | second | third);
+              n -= 2;
+              start -= 2;
+	    }
+#else
+	  else 
 	    PUTCHARLP(*s++);
+#endif
 	}
     }
 }