Do an explicit "is filename sane" check

Until now, filenames containing '/' or being equal to '..' or '.' where
not handled explicitly, because they are canonicalized later, which
will then fail.

This commit adds an explicit check to make those fail immediately with
a clear, specific error message.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/common.h b/include/common.h
index 17d709e..ba42054 100644
--- a/include/common.h
+++ b/include/common.h
@@ -140,6 +140,7 @@ void sqfs_writer_cleanup(sqfs_writer_t *sqfs);
 
 void sqfs_perror(const char *file, const char *action, int error_code);
 
+bool is_filename_sane(const char *name);
 
 /*
   A wrapper around mkdir() that behaves like 'mkdir -p'. It tries to create