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authorShawn O. Pearce <spearce@spearce.org>2007-03-07 01:44:37 (GMT)
committerJunio C Hamano <junkio@cox.net>2007-03-07 19:15:26 (GMT)
commitdc49cd769b5fa6b7e0114b051c34a849828a7603 (patch)
tree7eafafcd36ab731599da3fb5e59d3f4379c342d3 /builtin-blame.c
parent6777a59fcdfd96b9ca5cba49cb265c6c47de3d02 (diff)
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Cast 64 bit off_t to 32 bit size_t
Some systems have sizeof(off_t) == 8 while sizeof(size_t) == 4. This implies that we are able to access and work on files whose maximum length is around 2^63-1 bytes, but we can only malloc or mmap somewhat less than 2^32-1 bytes of memory. On such a system an implicit conversion of off_t to size_t can cause the size_t to wrap, resulting in unexpected and exciting behavior. Right now we are working around all gcc warnings generated by the -Wshorten-64-to-32 option by passing the off_t through xsize_t(). In the future we should make xsize_t on such problematic platforms detect the wrapping and die if such a file is accessed. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'builtin-blame.c')
-rw-r--r--builtin-blame.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/builtin-blame.c b/builtin-blame.c
index 20966b9..b51cdc7 100644
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -1963,7 +1963,7 @@ static struct commit *fake_working_tree_commit(const char *path, const char *con
die("Cannot lstat %s", path);
read_from = path;
}
- fin_size = st.st_size;
+ fin_size = xsize_t(st.st_size);
buf = xmalloc(fin_size+1);
mode = canon_mode(st.st_mode);
switch (st.st_mode & S_IFMT) {