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From: "Andrey A. Chernov" <ache@FreeBSD.org>
Date: Thu, 1 Sep 2016 18:12:53 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r305219 - head/lib/libc/stdio
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Author: ache
Date: Thu Sep  1 18:12:53 2016
New Revision: 305219
URL: https://svnweb.freebsd.org/changeset/base/305219

Log:
  If error happens, don't overwrite original errno comes from __mbrtowc()
  and __srefill().
  
  MFC after:      3 days

Modified:
  head/lib/libc/stdio/fgetwc.c

Modified: head/lib/libc/stdio/fgetwc.c
==============================================================================
--- head/lib/libc/stdio/fgetwc.c	Thu Sep  1 18:11:44 2016	(r305218)
+++ head/lib/libc/stdio/fgetwc.c	Thu Sep  1 18:12:53 2016	(r305219)
@@ -84,9 +84,10 @@ __fgetwc_mbs(FILE *fp, mbstate_t *mbs, i
 		return (WEOF);
 	do {
 		nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, mbs);
-		if (nconv == (size_t)-1)
-			break;
-		else if (nconv == (size_t)-2)
+		if (nconv == (size_t)-1) {
+			fp->_flags |= __SERR;
+			return (WEOF);
+		} else if (nconv == (size_t)-2)
 			continue;
 		else if (nconv == 0) {
 			fp->_p++;
@@ -100,7 +101,9 @@ __fgetwc_mbs(FILE *fp, mbstate_t *mbs, i
 			return (wc);
 		}
 	} while (__srefill(fp) == 0);
-	fp->_flags |= __SERR;
-	errno = EILSEQ;
+	if (__sfeof(fp)) {
+		fp->_flags |= __SERR;
+		errno = EILSEQ;
+	}
 	return (WEOF);
 }