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Fixed bug #77081 ftruncate() changes seek pointer in c mode

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This commit is contained in:
Anatol Belski 2018-10-30 20:42:00 +01:00
parent 2816a3fdfa
commit 8827cc34cf
3 changed files with 31 additions and 3 deletions
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3
NEWS
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@ -13,6 +13,9 @@ PHP NEWS
. Fixed bug #50675 (SoapClient can't handle object references correctly).
(Cameron Porter)
- Standard:
. Fixed bug #77081 (ftruncate() changes seek pointer in c mode). (cmb, Anatol)
- XML:
. Fixed bug 71592 (External entity processing never fails). (cmb)

24
ext/standard/tests/file/ftruncate_bug77081.phpt Normal file
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@ -0,0 +1,24 @@
--TEST--
Bug #77081 ftruncate() changes seek pointer in c mode
--FILE--
<?php
$filename = dirname(__FILE__) . DIRECTORY_SEPARATOR . "test77081";
file_put_contents($filename, 'foo');
$stream = fopen($filename, 'c');
ftruncate($stream, 0);
var_dump(ftell($stream));
fwrite($stream, 'bar');
fclose($stream);
var_dump(file_get_contents($filename));
?>
--CLEAN--
<?php
$fn = dirname(__FILE__) . DIRECTORY_SEPARATOR . "test77081";
unlink($fn);
?>
--EXPECT--
int(0)
string(3) "bar"

7
main/streams/plain_wrapper.c
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@ -858,12 +858,13 @@ static int php_stdiop_set_option(php_stream *stream, int option, int value, void
return PHP_STREAM_OPTION_RETURN_ERR;
}
LARGE_INTEGER old_sz;
if (!GetFileSizeEx(h, &old_sz)) {
LARGE_INTEGER sz, old_sz;
sz.QuadPart = 0;
if (!SetFilePointerEx(h, sz, &old_sz, FILE_CURRENT)) {
return PHP_STREAM_OPTION_RETURN_ERR;
}
LARGE_INTEGER sz;
#if defined(_WIN64)
sz.HighPart = (new_size >> 32);
sz.LowPart = (new_size & 0xffffffff);