difftool: avoid strcpy
In order to checkout files, difftool reads "diff --raw" output and feeds the names to checkout_entry(). That function requires us to have a "struct cache_entry". And because that struct uses a FLEX_ARRAY for the name field, we have to actually copy in our new name. The current code allocates a single re-usable cache_entry that can hold a name up to PATH_MAX, and then copies filenames into it using strcpy(). But there's no guarantee that incoming names are smaller than PATH_MAX. They've come from "diff --raw" output which might be diffing between two trees (and hence we'd be subject to the PATH_MAX of some other system, or even none at all if they were created directly via "update-index"). We can fix this by using make_cache_entry() to create a correctly-sized cache_entry for each name. This incurs an extra allocation per file, but this is negligible compared to actually writing out the file contents. To make this simpler, we can push this procedure into a new helper function. Note that we can also get rid of the "len" variables for src_path and dst_path (and in fact we must, as the compiler complains that they are unused). Signed-off-by: Jeff King <peff@peff.net> Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>