Some common stuff used by other UTF-8 patches.

================================================================================
--- mc-4.6.2/src/util.c
+++ mc-4.6.2/src/util.c
@@ -145,6 +145,30 @@
 	return strlen (str);
 }
 
+int
+columns_to_bytes (const char *str, int col)
+{
+    int bytes = 0;
+    int columns = 0;
+    int i;
+#ifdef UTF8
+    if (SLsmg_Is_Unicode) {
+	static mbstate_t s;
+	while (columns < col) {
+	    memset (&s, 0, sizeof (s));
+	    i = mbrlen (str + bytes, -1, &s);
+	    if (i <= 0) {
+		return col + bytes - columns;
+	    }
+	    bytes += i;
+	    columns ++;
+	}
+	return col + bytes - columns;
+    } else
+#endif
+	return col;
+}
+
 #ifdef UTF8
 
 void 
--- mc-4.6.2/src/util.h
+++ mc-4.6.2/src/util.h
@@ -104,6 +104,7 @@
 
 void fix_utf8(char *str);
 size_t mbstrlen (const char *);
+int columns_to_bytes (const char *, int);
 wchar_t *mbstr_to_wchar (const char *);
 char *wchar_to_mbstr (const wchar_t *);
 char *utf8_to_local(char *str);