#42036 [Asn->Fbk]: fgetc() sets end of the file flag when reading on write only file

ID: 42036 Updated by: wez@php.net Reported By: kraghuba at in dot ibm dot com -Status: Assigned +Status: Feedback Bug Type: Filesystem function related Operating System: RHEL 5 PHP Version: 5CVS-2007-07-18 (snap) Assigned To: wez New Comment: Without having had time to dig deeper just yet, if you open for write only, you shouldn't expect to be able to read. This application-level error is reflected as EOF. So the question becomes, is this behavior different from libc, and did the php behavior change between releases? (I'm not including PHP 6 in that, because it is not released yet) If the latter, we need to fix it, it not, we probably shouldn't fix it if there's a risk of breaking an app. I'm leaning towards won't fix; you should open the file as you intend to use it. Previous Comments: ------------------------------------------------------------------------ [2007-07-23 08:34:56] tony2001@php.net Wez, could you plz comment this? ------------------------------------------------------------------------ [2007-07-21 05:55:08] kraghuba at in dot ibm dot com This defect is also applicable to the function fgets(). ------------------------------------------------------------------------ [2007-07-18 16:48:08] kraghuba at in dot ibm dot com Description: ------------ fgetc() sets the end of the file flag to ture when reading from a file which opened in write only mode. This failure is applicable on php5 and php6 php version: PHP 6.0.0-dev (cli) (built: Jul 18 2007 20:53:03) (GCOV) Copyright (c) 1997-2007 The PHP Group Zend Engine v3.0.0-dev, Copyright (c) 1998-2007 Zend Technologies & PHP 5.2.4-dev (cli) (built: Jul 18 2007 20:49:53) (GCOV) Copyright (c) 1997-2007 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies OS : RHEL 5 configure setup: ./configure --enable-gcov Reproduce code: --------------- <?php $fp = fopen("test.txt", "w"); var_dump( fwrite($fp, "Text") ); // rewind the file pointer to begining var_dump( rewind($fp) ); var_dump( ftell($fp) ); var_dump( feof($fp) ); // try to read var_dump( fgetc($fp) ); var_dump( ftell($fp) ); var_dump( feof($fp) ); fclose($fp); unlink("test.txt"); ?> Expected result: ---------------- output - php5: -------------- int(4) bool(true) int(0) bool(false) bool(false) int(0) bool(false) output - php6: -------------- int(4) bool(true) int(0) bool(false) bool(false) int(0) bool(false) Actual result: -------------- output - php5: -------------- int(4) bool(true) int(0) bool(false) bool(false) int(0) bool(true) output - php6: -------------- int(4) bool(true) int(0) bool(false) string(1) "" int(0) bool(true) output on php6 when run using run-test.php : int(4) bool(true) int(0) bool(false) string(1) "ÿ" int(0) bool(true) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=42036&edit=1