<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div>Hi Rob:</div><div><br></div><div>Thank you for your patience. I updated <span style="font-family: arial; white-space: pre-wrap;"> Elliott's fix</span> and solved my problems.</div><br>ths.<br><div style="position:relative;zoom:1">--<br><p><span style="FONT-FAMILY: Microsoft Yahei"><span style="FONT-FAMILY: "><span style="FONT-FAMILY: "><span style="FONT-FAMILY: ; COLOR: #000000">------------------------------------</span></span></span></span><span style="FONT-FAMILY: Georgia"><span style="FONT-FAMILY: "><span style="FONT-FAMILY: "></span></span></span></p><span style="FONT-FAMILY: Comic Sans MS"><span style="FONT-FAMILY: "><span style="FONT-FAMILY: "><span style="FONT-FAMILY: ">
<p><span style="FONT-FAMILY: "><span style="FONT-FAMILY: "><span style="FONT-FAMILY: "><span style="FONT-FAMILY: Comic Sans MS; COLOR: #000000">thanks with best regards!</span></span></span></span></p></span></span></span>
<p><span style="FONT-FAMILY: Comic Sans MS"></span><span style="FONT-FAMILY: Comic Sans MS"></span><span style="FONT-FAMILY: "><span style="FONT-FAMILY: Comic Sans MS">email£º</span><a style="FONT-FAMILY: Comic Sans MS" href="mailto:wen.xie@archermind.com;xiewen202@163.com">wen.xie@archermind.com;xiewen202@163.com</a></span></p><span style="FONT-FAMILY: "><span style="FONT-FAMILY: ">
<p style="FONT-FAMILY: Comic Sans MS">phone£º15850502564</p></span></span></span><span style="FONT-FAMILY: Georgia"><span style="FONT-FAMILY: "></span></span><span style="FONT-FAMILY: Arial"></span>
<p> </p><div style="clear:both"></div></div><div id="divNeteaseMailCard"></div><br><pre><br>At 2018-08-05 22:21:47, "Rob Landley" <rob@landley.net> wrote:
>On 08/05/2018 01:41 AM, xiewen wrote:
>> Hi Rob£º
>>   
>>    Thank you and Elliott's help.
>> i have a doubt:
>> why is it removed if(options) ?
>
>Because free(NULL) is defined as a NOP in posix and C99, so there's no need to test:
>
>http://pubs.opengroup.org/onlinepubs/9699919799/functions/free.html
>
>Rob
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