FTP: reject path components with control codes
Refuse to operate when given path components featuring byte values lower than 32. Previously, inserting a %00 sequence early in the directory part when using the 'singlecwd' ftp method could make curl write a zero byte outside of the allocated buffer. Test case 340 verifies. CVE-2018-1000120 Reported-by: Duy Phan Thanh Bug: https://curl.haxx.se/docs/adv_2018-9cd6.html
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