* 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.

ChangeLog

@@ -1,15 +1,14 @@
 2007-07-07  Ulrich Drepper  <drepper@redhat.com>
 
-	* libio/wstrops.c (_IO_wstr_underflow): Clear errno before
-	returning WEOF.
-	* stdio-common/Makefile (tests): Add bug18a.
-	* stdio-common/bug18a.c: New file.
-
 	[BZ #4745]
-	* libio/strops.c (_IO_str_underflow): Clear errno before returning
-	EOF.
-	* stdio-common/Makefile (tests): Add bug18.
+	* 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/bug18.c: New file.
+	* stdio-common/bug18a.c: New file.
+	* stdio-common/bug19.c: New file.
+	* stdio-common/bug19a.c: New file.
 
 2007-07-05  Mike Frysinger  <vapier@gentoo.org>
 

libio/strops.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1997-2004, 2006, 2007 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1997-2003, 2004, 2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -166,12 +166,7 @@ _IO_str_underflow (fp)
   if (fp->_IO_read_ptr < fp->_IO_read_end)
     return *((unsigned char *) fp->_IO_read_ptr);
   else
-    {
-      /* We have to reset errno since callers check for errno being
-	 EINTR and there has been no such problem here.  */
-      __set_errno (0);
-      return EOF;
-    }
+    return EOF;
 }
 INTDEF(_IO_str_underflow)
 

libio/wstrops.c

@@ -1,5 +1,4 @@
-/* Copyright (C) 1993,1997-1999,2001-2004,2006,2007
-   Free Software Foundation, Inc.
+/* Copyright (C) 1993,1997-1999,2001-2004, 2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -155,12 +154,7 @@ _IO_wstr_underflow (fp)
   if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
     return *fp->_wide_data->_IO_read_ptr;
   else
-    {
-      /* We have to reset errno since callers check for errno being
-	 EINTR and there has been no such problem here.  */
-      __set_errno (0);
-      return WEOF;
-    }
+    return WEOF;
 }
 
 

stdio-common/Makefile

@@ -54,7 +54,8 @@ tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
 	 tst-swprintf tst-fseek tst-fmemopen test-vfprintf tst-gets \
 	 tst-perror tst-sprintf tst-rndseek tst-fdopen tst-fphex bug14 bug15 \
 	 tst-popen tst-unlockedio tst-fmemopen2 tst-put-error tst-fgets \
-	 tst-fwrite bug16 bug17 tst-swscanf tst-sprintf2 bug18 bug18a
+	 tst-fwrite bug16 bug17 tst-swscanf tst-sprintf2 bug18 bug18a \
+	 bug19 bug19a
 
 test-srcs = tst-unbputc tst-printf
 

stdio-common/bug19.c

@@ -0,0 +1,58 @@
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+
+#ifndef CHAR
+# define CHAR char
+# define L(str) str
+# define FPUTS fputs
+# define FSCANF fscanf
+#endif
+
+
+static int
+do_test (void)
+{
+  FILE *fp = tmpfile ();
+  if (fp == NULL)
+    {
+      puts ("cannot open file");
+      return 1;
+    }
+
+  FPUTS (L("7-11"), fp);
+  rewind (fp);
+
+  printf("setting errno to EINTR\n");
+  errno = EINTR;
+
+  printf("checking sscanf\n");
+
+  int i, j, n;
+
+  i = j = n = 0;
+  FSCANF (fp, L(" %i - %i %n"), &i, &j, &n);
+  printf ("found %i-%i (length=%i)\n", i, j, n);
+
+  int result = 0;
+  if (i != 7)
+    {
+      printf ("i is %d, expected 7\n", i);
+      result = 1;
+    }
+  if (j != 11)
+    {
+      printf ("j is %d, expected 11\n", j);
+      result = 1;
+    }
+  if (n != 4)
+    {
+      printf ("n is %d, expected 4\n", j);
+      result = 1;
+    }
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"

stdio-common/bug19a.c

@@ -0,0 +1,7 @@
+#include <wchar.h>
+#define CHAR wchar_t
+#define L(str) L##str
+#define FPUTS fputws
+#define FSCANF fwscanf
+
+#include "bug19.c"

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;
 	}