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Bug #67371 fread does not return error (false) while reading out of file
Submitted: 2014-06-02 07:47 UTC Modified: 2014-06-02 09:12 UTC
From: roman4e at gmail dot com Assigned:
Status: Not a bug Package: Filesystem function related
PHP Version: 5.5.13 OS: linux mint 15
Private report: No CVE-ID: None
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 [2014-06-02 07:47 UTC] roman4e at gmail dot com 
Description:
------------
php v.5.5.5 (cli) (built: Mar 17 2014 12:31:03) (DEBUG)

fread() does not return error (false) on read out of file, returns "" (empty string)

Test script:
---------------
$f = fopen("file","r"); // file must be several KBytes size
$page = 0;
while ( !fseek($f,$page,SEEK_SET) )
{
   $page += 1024;
   $str = fread($f,1024);
   if ( $str === false )
      die("error reading block");
}

echo "ok"

Expected result:
----------------
fread should return false

Actual result:
--------------
file size of 76800
result of reading out of file. last parametr is type of data returned by fread
Pageoff = 75776 fseek=0 ftell=75776 read=1024 string
Pageoff = 76800 fseek=0 ftell=76800 read=0 string
Pageoff = 77824 fseek=0 ftell=77824 read=0 string

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 [2014-06-02 08:31 UTC] mike@php.net
-Status: Open +Status: Not a bug
 [2014-06-02 08:31 UTC] mike@php.net 
This is not a bug, reading past EOF is not an error case; read(2) states:

"If the current file offset is at or past the end of file, no bytes are read, and read() returns zero."
 [2014-06-02 09:03 UTC] roman4e at gmail dot com 
There is one string in PHP manual for fread():

Reading stops as soon as one of the following conditions is met:
- EOF (end of file) is reached

So it SHOULD return false, when EOF is reached.
 [2014-06-02 09:12 UTC] mike@php.net 
You clear EOF with fseek, see your other bug.
 
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