From 405550bf78acc8ce8885e4b30986035533d08267 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Wed, 24 Jul 2002 10:44:53 +0000
Subject: Update.

2002-07-24  Ulrich Drepper  <drepper@redhat.com>

	* locale/hashval.h: Make more self-containedby defining LONG_BITS.
	* locale/programs/simple-hash.c: Remove LONG_BITS definition.

	* locale/programs/locarchive.c (add_locale_to_archive): Correct
	test to detect duplicate locales.

	* libio/fileops.c (_IO_new_file_seekoff): Fail if relative
	position would be before beginning of file.
	(_IO_file_seekoff_mmap): Likewise.
	* libio/Makefile (tests): Add bug-fseek.
	* libio/bug-fseek.c: New file.

	* intl/explodename.c: Remove support for CEN-style locale variables.
	It was never used and shouldn't be since it's not portable.
	* intl/finddomain.c: Likewise.
	* intl/l10nflist.c: Likewise.
	* intl/loadinfo.h: Likewise.
	* locale/findlocale.c: Likewise.
---
 libio/Makefile    |  2 +-
 libio/bug-fseek.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 libio/fileops.c   | 10 ++++++
 3 files changed, 105 insertions(+), 1 deletion(-)
 create mode 100644 libio/bug-fseek.c

(limited to 'libio')

diff --git a/libio/Makefile b/libio/Makefile
index d10d6c1..1326346 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -50,7 +50,7 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc   \
 	tst_wprintf2 tst-widetext test-fmemopen tst-ext tst-fopenloc	      \
 	tst-fgetws tst-ungetwc1 tst-ungetwc2 tst-swscanf tst-sscanf	      \
 	tst-mmap-setvbuf bug-ungetwc1 bug-ungetwc2 tst-atime tst-eof          \
-	tst-freopen bug-rewind bug-ungetc
+	tst-freopen bug-rewind bug-ungetc bug-fseek
 test-srcs = test-freopen
 
 all: # Make this the default target; it will be defined in Rules.
diff --git a/libio/bug-fseek.c b/libio/bug-fseek.c
new file mode 100644
index 0000000..d8cd712
--- /dev/null
+++ b/libio/bug-fseek.c
@@ -0,0 +1,94 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+static char *fname;
+
+
+static void do_prepare (void);
+#define PREPARE(argc, argv) do_prepare ()
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include <test-skeleton.c>
+
+
+static void
+do_prepare (void)
+{
+  static const char pattern[] = "12345678901234567890";
+  int fd = create_temp_file ("bug-fseek.", &fname);
+  if (fd == -1)
+    {
+      printf ("cannot create temporary file: %m\n");
+      exit (1);
+    }
+
+  if (write (fd, pattern, sizeof (pattern)) != sizeof (pattern))
+    {
+      perror ("short write");
+      abort ();
+    }
+  close (fd);
+}
+
+
+
+static int
+do_test (void)
+{
+  FILE *f;
+  int result = 0;
+  char buf[10];
+
+
+  if ((f = fopen (fname, "r")) == (FILE *) NULL)
+    {
+      perror ("fopen(\"r\")");
+    }
+
+  fread (buf, 3, 1, f);
+  errno = 0;
+  if (fseek (f, -10, SEEK_CUR) == 0)
+    {
+      printf ("fseek() for r to before start of file worked!\n");
+      result = 1;
+    }
+  else if (errno != EINVAL)
+    {
+      printf ("\
+fseek() for r to before start of file did not set errno to EINVAL.  \
+Got %d instead\n",
+	 errno);
+      result = 1;
+    }
+
+  fclose (f);
+
+
+  if ((f = fopen (fname, "r+")) == (FILE *) NULL)
+    {
+      perror ("fopen(\"r+\")");
+    }
+
+  fread (buf, 3, 1, f);
+  errno = 0;
+  if (fseek (f, -10, SEEK_CUR) == 0)
+    {
+      printf ("fseek() for r+ to before start of file worked!\n");
+      result = 1;
+    }
+  else if (errno != EINVAL)
+    {
+      printf ("\
+fseek() for r+ to before start of file did not set errno to EINVAL.  \
+Got %d instead\n",
+	 errno);
+      result = 1;
+    }
+
+  fclose (f);
+
+  return result;
+}
diff --git a/libio/fileops.c b/libio/fileops.c
index fa4c8e0..1794dce 100644
--- a/libio/fileops.c
+++ b/libio/fileops.c
@@ -778,6 +778,11 @@ _IO_new_file_seekoff (fp, offset, dir, mode)
 	goto dumb;
       /* Make offset absolute, assuming current pointer is file_ptr(). */
       offset += fp->_offset;
+      if (offset < 0)
+	{
+	  __set_errno (EINVAL);
+	  return EOF;
+	}
 
       dir = _IO_seek_set;
       break;
@@ -934,6 +939,11 @@ _IO_file_seekoff_mmap (fp, offset, dir, mode)
     case _IO_seek_cur:
       /* Adjust for read-ahead (bytes is buffer). */
       offset += fp->_IO_read_ptr - fp->_IO_read_base;
+      if (offset < 0)
+	{
+	  __set_errno (EINVAL);
+	  return EOF;
+	}
       break;
     case _IO_seek_set:
       break;
-- 
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