* stdio-common/vfscanf.c (_IO_vfscanf): Add additional test for EOF

	in loop to look for conversion specifier to avoid testing of
	wrong errno value.
	* stdio-common/Makefile (tests): Add bug18, bug18a, bug19, bug19a.
	* stdio-common/bug18a.c: New file.
	* stdio-common/bug19.c: New file.
	* stdio-common/bug19a.c: New file.

1 files changed, 8 insertions, 3 deletions

diff --git a/stdio-common/vfscanf.c b/stdio-common/vfscanf.c
index b1469b9a9e..9e6daced5d 100644
--- a/stdio-common/vfscanf.c
+++ b/stdio-common/vfscanf.c
@@ -530,12 +530,17 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
 	{
 	  /* Eat whitespace.  */
 	  int save_errno = errno;
-	  errno = 0;
+	  __set_errno (0);
 	  do
-	    if (__builtin_expect (inchar () == EOF && errno == EINTR, 0))
+	    /* We add the additional test for EOF here since otherwise
+	       inchar will restore the old errno value which might be
+	       EINTR but does not indicate an interrupt since nothing
+	       was read at this time.  */
+	    if (__builtin_expect ((c == EOF || inchar () == EOF)
+				  && errno == EINTR, 0))
 	      input_error ();
 	  while (ISSPACE (c));
-	  errno = save_errno;
+	  __set_errno (save_errno);
 	  ungetc (c, s);
 	  skip_space = 0;
 	}