Assertion failure at main/streams/streams.c:1385

[YuanchengJiang]

Description

The following code:

<?php
$file_path = __DIR__;
$fusion = $file_path;
$h = gzopen($fusion, 'r');
var_dump(gzread($h, 10));
var_dump(gzseek( $h, 34, SEEK_CUR ) );
var_dump(gzseek( $h, -27, SEEK_CUR ) );

Resulted in this output:

/php-src/main/streams/streams.c:1385: int _php_stream_seek(php_stream *, zend_off_t, int): Assertion `stream->position >= 0' failed.
Aborted (core dumped)

PHP Version

nightly

Operating System

ubuntu 22.04

[devnexen]

not very familiar with streams however it appears to me since it is not a seekable stream, its position is set to -1 but then the seek callback still proceeds and fall into this assertion. But that s just a quick look.

[devnexen]

So.. either we assume it s not a seekable stream if position is -1 then we bail at this or getting the underlying php_stdio_stream_data part of the stream and checking is_seekable member.