http://sourceware.org/ml/libc-hacker/2002-11/msg00071.html

When fnmatch detects an invalid multibyte character it should fall back to

single byte matching, so that "*" has a chance to match such a string.

Andreas.

2005-04-12  Andreas Schwab  <schwab@suse.de>

	* posix/fnmatch.c (fnmatch): If conversion to wide character

	fails fall back to single byte matching.

Index: posix/fnmatch.c

===================================================================

diff -durN glibc-2.12.1.orig/posix/fnmatch.c glibc-2.12.1/posix/fnmatch.c

--- glibc-2.12.1.orig/posix/fnmatch.c	2007-07-28 22:35:00.000000000 +0200

+++ glibc-2.12.1/posix/fnmatch.c	2009-11-13 00:50:39.000000000 +0100

@@ -327,6 +327,7 @@

 # if HANDLE_MULTIBYTE

   if (__builtin_expect (MB_CUR_MAX, 1) != 1)

     {

+      const char *orig_pattern = pattern;

       mbstate_t ps;

       size_t n;

       const char *p;

@@ -382,10 +383,8 @@

 	  wstring = (wchar_t *) alloca ((n + 1) * sizeof (wchar_t));

 	  n = mbsrtowcs (wstring, &p, n + 1, &ps);

 	  if (__builtin_expect (n == (size_t) -1, 0))

-	    /* Something wrong.

-	       XXX Do we have to set `errno' to something which mbsrtows hasn't

-	       already done?  */

-	    return -1;

+	    /* Something wrong.  Fall back to single byte matching.  */

+	    goto try_singlebyte;

 	  if (p)

 	    {

 	      memset (&ps, '\0', sizeof (ps));

@@ -397,10 +396,8 @@

 	prepare_wstring:

 	  n = mbsrtowcs (NULL, &string, 0, &ps);

 	  if (__builtin_expect (n == (size_t) -1, 0))

-	    /* Something wrong.

-	       XXX Do we have to set `errno' to something which mbsrtows hasn't

-	       already done?  */

-	    return -1;

+	    /* Something wrong.  Fall back to single byte matching.  */

+	    goto try_singlebyte;

 	  wstring = (wchar_t *) alloca ((n + 1) * sizeof (wchar_t));

 	  assert (mbsinit (&ps));

 	  (void) mbsrtowcs (wstring, &string, n + 1, &ps);

@@ -408,6 +405,9 @@

       return internal_fnwmatch (wpattern, wstring, wstring + n,

 				flags & FNM_PERIOD, flags, NULL);

+

+    try_singlebyte:

+      pattern = orig_pattern;

     }

 # endif  /* mbstate_t and mbsrtowcs or _LIBC.  */