From d846d0e80aa0822ab3f59eea9e85413c4d357748 Mon Sep 17 00:00:00 2001
From: Ilia Alshanetsky <iliaa@php.net>
Date: Sun, 5 Jun 2011 21:57:01 +0000
Subject: [PATCH] Fixed bug #51997 (SEEK_CUR with 0 value, returns a warning).

---
 NEWS                        |  1 +
 ext/bz2/tests/bug51997.phpt | 24 ++++++++++++++++++++++++
 main/streams/streams.c      |  2 +-
 3 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 ext/bz2/tests/bug51997.phpt

diff --git a/NEWS b/NEWS
index cc522cf53f1..f30d8dadea0 100644
--- a/NEWS
+++ b/NEWS
@@ -47,6 +47,7 @@ PHP                                                                        NEWS
   . Fixed bug #54721 (Different Hashes on Windows, BSD and Linux on wrong Salt size) 
     (Pierre, os at irj dot ru)
   . Fixed bug #53848 (fgetcsv() ignores spaces at beginnings of fields). (Ilia)
+  . Fixed bug #51997 (SEEK_CUR with 0 value, returns a warning). (Ilia)
   . Fixed bug #50363 (Invalid parsing in convert.quoted-printable-decode filter).
     (slusarz at curecanti dot org)
   . Fixed bug #48465 (sys_get_temp_dir() possibly inconsistent when using 
diff --git a/ext/bz2/tests/bug51997.phpt b/ext/bz2/tests/bug51997.phpt
new file mode 100644
index 00000000000..fea53989477
--- /dev/null
+++ b/ext/bz2/tests/bug51997.phpt
@@ -0,0 +1,24 @@
+--TEST--
+Bug #51997 (SEEK_CUR with 0 value, returns a warning)
+--SKIPIF--
+<?php if (!extension_loaded("bz2")) print "skip"; ?>
+--FILE--
+<?php
+
+error_reporting(E_ALL);
+
+$filename = "testfile.bz2";
+$str = "This is a test string.\n";
+$bz = bzopen($filename, "w");
+bzwrite($bz, $str);
+bzclose($bz);
+
+$bz = bzopen($filename, "r");
+fseek($bz, 0, SEEK_CUR);
+print bzread($bz, 10);
+print bzread($bz);
+bzclose($bz);
+unlink($filename);
+
+--EXPECT--
+This is a test string.
diff --git a/main/streams/streams.c b/main/streams/streams.c
index 5029f5cd024..eb2eb07082b 100755
--- a/main/streams/streams.c
+++ b/main/streams/streams.c
@@ -1184,7 +1184,7 @@ PHPAPI int _php_stream_seek(php_stream *stream, off_t offset, int whence TSRMLS_
 	}
 
 	/* emulate forward moving seeks with reads */
-	if (whence == SEEK_CUR && offset > 0) {
+	if (whence == SEEK_CUR && offset >= 0) {
 		char tmp[1024];
 		size_t didread;
 		while(offset > 0) {