Author: pfg
Date: Thu Mar 31 01:36:50 2016
New Revision: 297440
URL: https://svnweb.freebsd.org/changeset/base/297440

Log:
  MFC   r296278:
  mbtowc(3): set errno to EILSEQ if an incomplete character is passed.
  
  According to POSIX, The mbtowc() function shall fail if:
  [EILSEQ] An invalid character sequence is detected.
  
  Reviewed by:          bapt
  Differential Revision:        https://reviews.freebsd.org/D5496
  
  Obtained from:        OpenBSD (Ingo Schwarze)

Modified:
  stable/10/lib/libc/locale/mbtowc.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/lib/libc/locale/mbtowc.c
==============================================================================
--- stable/10/lib/libc/locale/mbtowc.c  Thu Mar 31 00:53:23 2016        
(r297439)
+++ stable/10/lib/libc/locale/mbtowc.c  Thu Mar 31 01:36:50 2016        
(r297440)
@@ -32,6 +32,7 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include <errno.h>
 #include <stdlib.h>
 #include <wchar.h>
 #include "mblocal.h"
@@ -49,9 +50,15 @@ mbtowc_l(wchar_t * __restrict pwc, const
                return (0);
        }
        rval = XLOCALE_CTYPE(locale)->__mbrtowc(pwc, s, n, &locale->mbtowc);
-       if (rval == (size_t)-1 || rval == (size_t)-2)
+       switch (rval) {
+       case (size_t)-2:
+               errno = EILSEQ;
+               /* FALLTHROUGH */
+       case (size_t)-1:
                return (-1);
-       return ((int)rval);
+       default:
+               return ((int)rval);
+       }
 }
 int
 mbtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n)
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