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authorShawn O. Pearce <spearce@spearce.org>2007-03-06 20:44:37 -0500
committerJunio C Hamano <junkio@cox.net>2007-03-07 11:15:26 -0800
commitdc49cd769b5fa6b7e0114b051c34a849828a7603 (patch)
tree7eafafcd36ab731599da3fb5e59d3f4379c342d3 /diffcore-rename.c
parent6777a59fcdfd96b9ca5cba49cb265c6c47de3d02 (diff)
downloadgit-dc49cd769b5fa6b7e0114b051c34a849828a7603.tar.gz
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 'diffcore-rename.c')
-rw-r--r--diffcore-rename.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/diffcore-rename.c b/diffcore-rename.c
index 91fa2bea51..79030412db 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -172,7 +172,8 @@ static int estimate_similarity(struct diff_filespec *src,
return 0; /* error but caught downstream */
- delta_limit = base_size * (MAX_SCORE-minimum_score) / MAX_SCORE;
+ delta_limit = (unsigned long)
+ (base_size * (MAX_SCORE-minimum_score) / MAX_SCORE);
if (diffcore_count_changes(src->data, src->size,
dst->data, dst->size,
&src->cnt_data, &dst->cnt_data,
@@ -186,7 +187,7 @@ static int estimate_similarity(struct diff_filespec *src,
if (!dst->size)
score = 0; /* should not happen */
else
- score = src_copied * MAX_SCORE / max_size;
+ score = (int)(src_copied * MAX_SCORE / max_size);
return score;
}
@@ -297,7 +298,7 @@ void diffcore_rename(struct diff_options *options)
struct diff_filespec *one = rename_src[j].one;
if (!is_exact_match(one, two, contents_too))
continue;
- record_rename_pair(i, j, MAX_SCORE);
+ record_rename_pair(i, j, (int)MAX_SCORE);
rename_count++;
break; /* we are done with this entry */
}