Add utf8 support to ls -C.
Use wcwidth() instead of strlen(), and extend the -q substitution to also
whiteout nonprintable characters that are nonparseable utf8 snippets.
diff --git a/lib/portability.h b/lib/portability.h
index 1d540ac..b5fc0ac 100644
--- a/lib/portability.h
+++ b/lib/portability.h
@@ -60,6 +60,11 @@
// http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
char *crypt(const char *key, const char *salt);
+// According to posix, #include header, get a function definition. But glibc...
+// http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html
+#include <wchar.h>
+int wcwidth(wchar_t wc);
+
// see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
#include <time.h>
char *strptime(const char *buf, const char *format, struct tm *tm);