ftp: improve fragile check for first digit > 3#18870
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In a case where rubbish would be sent in the line something that isn't a digit could be first in line and treated as less than '3'. Prevent this risk by first doing a check that the byte is a digit.
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In a case where rubbish would be sent in the line something that isn't a digit could be first in line and treated as less than '3'. Prevent this risk by first doing a check that the byte is a digit.