[BZ #4745]

2007-07-07  Ulrich Drepper  <drepper@redhat.com>
	[BZ #4745]
	* libio/strops.c (_IO_str_underflow): Clear errno before returning
	EOF.
	* stdio-common/Makefile (tests): Add bug18.
	* stdio-common/bug18.c: New file.

4 files changed, 58 insertions, 3 deletions

diff --git a/ChangeLog b/ChangeLog
index 9e11c51..71e1e5b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2007-07-07  Ulrich Drepper  <drepper@redhat.com>
+
+	[BZ #4745]
+	* libio/strops.c (_IO_str_underflow): Clear errno before returning
+	EOF.
+	* stdio-common/Makefile (tests): Add bug18.
+	* stdio-common/bug18.c: New file.
+
 2007-07-05  Mike Frysinger  <vapier@gentoo.org>
 
 	* Makeconfig ($(common-objpfx)gnu/lib-names.stmp): Use LC_ALL=C when
diff --git a/libio/strops.c b/libio/strops.c
index 05270ce..c3222e0 100644
--- a/libio/strops.c
+++ b/libio/strops.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1997-2003, 2004, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1997-2004, 2006, 2007 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
@@ -166,7 +166,12 @@ _IO_str_underflow (fp)
   if (fp->_IO_read_ptr < fp->_IO_read_end)
     return *((unsigned char *) fp->_IO_read_ptr);
   else
-    return EOF;
+    {
+      /* 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;
+    }
 }
 INTDEF(_IO_str_underflow)
 
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index 735b401..57797c7 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -54,7 +54,7 @@ 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
+	 tst-fwrite bug16 bug17 tst-swscanf tst-sprintf2 bug18
 
 test-srcs = tst-unbputc tst-printf
 
diff --git a/stdio-common/bug18.c b/stdio-common/bug18.c
new file mode 100644
index 0000000..c3a86e5
--- /dev/null
+++ b/stdio-common/bug18.c
@@ -0,0 +1,42 @@
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+
+
+static int
+do_test (void)
+{
+  printf("setting errno to EINTR\n");
+  errno = EINTR;
+
+  printf("checking sscanf\n");
+
+  char str[] = "7-11";
+  int i, j, n;
+
+  i = j = n = 0;
+  sscanf (str, " %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"