Avoid calls to strlen in path processing functions.
* fileio.c (file_name_as_directory): Add comment. Change to add srclen argument and return the length of result. Adjust users accordingly. (directory_file_name): Fix comment. Change to add srclen argument, swap 1nd and 2st arguments to obey the common convention. Adjust users accordingly. * filelock.c (fill_in_lock_file_name): Avoid calls to strlen.
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