git_SHA_CTX old_sha1_ctx, new_sha1_ctx;
struct pack_header hdr;
char *buf;
+ ssize_t read_result;
git_SHA1_Init(&old_sha1_ctx);
git_SHA1_Init(&new_sha1_ctx);
if (lseek(pack_fd, 0, SEEK_SET) != 0)
die_errno("Failed seeking to start of '%s'", pack_name);
- if (read_in_full(pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
+ read_result = read_in_full(pack_fd, &hdr, sizeof(hdr));
+ if (read_result < 0)
die_errno("Unable to reread header of '%s'", pack_name);
+ else if (read_result != sizeof(hdr))
+ die_errno("Unexpected short read for header of '%s'",
+ pack_name);
if (lseek(pack_fd, 0, SEEK_SET) != 0)
die_errno("Failed seeking to start of '%s'", pack_name);
git_SHA1_Update(&old_sha1_ctx, &hdr, sizeof(hdr));