--- wcwidth.c	2007-05-26 18:06:24.000000000 +0800
+++ wcwidth.cc	2014-02-13 18:36:18.668331252 +0800
@@ -59,15 +59,23 @@
  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
  */
 
-#include <wchar.h>
+/* This file is modified to work with C++ and present Unicode
+ * characters in uint32_t type.
+ */
+
+#include <system.hh>
+
+namespace ledger {
 
-struct interval {
-  int first;
-  int last;
-};
+namespace {
+  struct interval {
+    int first;
+    int last;
+  };
+}
 
 /* auxiliary function for binary search in interval table */
-static int bisearch(wchar_t ucs, const struct interval *table, int max) {
+static int bisearch(boost::uint32_t ucs, const struct interval *table, int max) {
   int min = 0;
   int mid;
 
@@ -119,7 +127,7 @@
  * in ISO 10646.
  */
 
-int mk_wcwidth(wchar_t ucs)
+int mk_wcwidth(boost::uint32_t ucs)
 {
   /* sorted list of non-overlapping intervals of non-spacing characters */
   /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
@@ -204,7 +212,7 @@
 }
 
 
-int mk_wcswidth(const wchar_t *pwcs, size_t n)
+int mk_wcswidth(const boost::uint32_t *pwcs, size_t n)
 {
   int w, width = 0;
 
@@ -227,7 +235,7 @@
  * the traditional terminal character-width behaviour. It is not
  * otherwise recommended for general use.
  */
-int mk_wcwidth_cjk(wchar_t ucs)
+int mk_wcwidth_cjk(boost::uint32_t ucs)
 {
   /* sorted list of non-overlapping intervals of East Asian Ambiguous
    * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
@@ -295,7 +303,7 @@
 }
 
 
-int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n)
+int mk_wcswidth_cjk(const boost::uint32_t *pwcs, size_t n)
 {
   int w, width = 0;
 
@@ -307,3 +315,5 @@
 
   return width;
 }
+
+} // namespace ledger