Make new_string_list() initialize the buffer it creates to hold a file's
contents, preventing a segfault later on should jam attempt to parse the
contents of an empty file.
Fixes#15250.
Change-Id: I907dccd26e1ca35fbe07ed6d624b0144487134fe
Reviewed-on: https://review.haiku-os.org/c/buildtools/+/1716
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
For its input files jam uses a buffer of 512 chars for fgets(). Lines
would therefore be split silently after that length, which could lead to
"interesting" issues. Now we fail to prevent the situation from going
unnoticed.
When reading the cache file failed we have to assume it is corrupt and
we should use any entries read from it. So now we remove the ones we
read again.
