ncurses: Use ncursesw to correctly display wide characters on UTF-8 locale

NEWS

@@ -111,6 +111,8 @@ Interfaces:
      interface for media players that intends to become an xdg standard when 
      finished: http://wiki.xmms2.xmms.se/index.php/Media_Player_Interfaces .
    * Motion module use disk accelerometers to keep video horizontal
+   * Ncurses interface now uses ncursesw to correctly display wide characters
+     when using an UTF-8 locale.
 
 Linux Port:
  * VLC now complies with the XDG Base Directory Specification version 0.6

configure.ac

@@ -5313,7 +5313,7 @@ AC_ARG_ENABLE(ncurses,
   [  --enable-ncurses        ncurses interface support (default disabled)],
   [if test "${enable_ncurses}" = "yes"; then
      VLC_ADD_PLUGINS([ncurses])
-     VLC_ADD_LDFLAGS([ncurses],[-lncurses])
+     VLC_ADD_LDFLAGS([ncurses],[-lncursesw])
    fi])
 
 dnl

modules/gui/ncurses.c

@@ -32,7 +32,7 @@
 #include <errno.h>                                                 /* ENOMEM */
 #include <time.h>
 
-#include <curses.h>
+#include <ncursesw/curses.h>
 
 #include <vlc_interface.h>
 #include <vlc_vout.h>
@@ -1125,19 +1125,33 @@ static void mvnprintw( int y, int x, int w, const char *p_fmt, ... )
     va_list  vl_args;
     char    *p_buf = NULL;
     int      i_len;
+    size_t   i_char_len;    /* UCS character length */
+    size_t   i_width;       /* Display width */
+    wchar_t *psz_wide;      /* wchar_t representation of p_buf */
 
     va_start( vl_args, p_fmt );
     vasprintf( &p_buf, p_fmt, vl_args );
     va_end( vl_args );
 
-    if( p_buf == NULL )
-    {
+    if( ( p_buf == NULL ) || ( w <= 0 ) )
         return;
-    }
-    if(  w > 0 )
-    {
-        if( ( i_len = strlen( p_buf ) ) > w )
+
+    i_len = strlen( p_buf );
+    psz_wide = (wchar_t *) malloc( sizeof( wchar_t ) * ( i_len + 1 ) );
+
+    i_char_len = mbstowcs( psz_wide, p_buf, i_len );
+
+    if( i_char_len == -1 ) /* an invalid character was encountered */
+        i_width = i_len;
+    else
     {
+        i_width = wcswidth( psz_wide, i_char_len );
+        if( i_width == -1 ) /* a non printable character was encountered */
+            i_width = i_len;
+    }
+
+    if( i_width > w )
+    { /* FIXME: ellipsize psz_wide while keeping the width in mind */
         char *psz_local;
         int i_cut = i_len - w;
         int x1 = i_len/2 - i_cut/2;
@@ -1163,8 +1177,7 @@ static void mvnprintw( int y, int x, int w, const char *p_fmt, ... )
         char *psz_local = ToLocale( p_buf );
         mvprintw( y, x, "%s", psz_local );
         LocaleFree( p_buf );
-            mvhline( y, x + i_len, ' ', w - i_len );
-        }
+        mvhline( y, x + i_width, ' ', w - i_width );
     }
 }
 static void MainBoxWrite( intf_thread_t *p_intf, int l, int x, const char *p_fmt, ... )