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authorLibravatar Shawn O. Pearce <spearce@spearce.org>2007-03-06 20:44:37 -0500
committerLibravatar Junio C Hamano <junkio@cox.net>2007-03-07 11:15:26 -0800
commitdc49cd769b5fa6b7e0114b051c34a849828a7603 (patch)
tree7eafafcd36ab731599da3fb5e59d3f4379c342d3 /t/t5515/fetch.master_config-glob
parentUse off_t in pack-objects/fast-import when we mean an offset (diff)
downloadtgif-dc49cd769b5fa6b7e0114b051c34a849828a7603.tar.xz
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>
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