+ if (!name) {
+ static char commit_name[60];
+ strcpy(commit_name, sha1_to_hex(commit));
+ name = commit_name;
+ }
+
+ /* Root commit? */
+ if (show_root_diff && memcmp(buf + 46, "parent ", 7)) {
+ header = generate_header(name, "root", buf, size);
+ diff_root_tree(commit, "");
+ }
+
+ /* More than one parent? */
+ if (ignore_merges) {
+ if (!memcmp(buf + 46 + 48, "parent ", 7))
+ return 0;
+ }
+
+ offset = 46;
+ while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
+ unsigned char parent[20];
+ if (get_sha1_hex(buf + offset + 7, parent))
+ return -1;
+ header = generate_header(name, sha1_to_hex(parent), buf, size);
+ diff_tree_sha1_top(parent, commit, "");
+ if (!header && verbose_header) {
+ header_prefix = "\ndiff-tree ";
+ /*
+ * Don't print multiple merge entries if we
+ * don't print the diffs.
+ */
+ }
+ offset += 48;
+ }
+ return 0;
+}
+
+static int diff_tree_stdin(char *line)
+{
+ int len = strlen(line);
+ unsigned char commit[20], parent[20];
+ static char this_header[1000];
+
+ if (!len || line[len-1] != '\n')
+ return -1;
+ line[len-1] = 0;
+ if (get_sha1_hex(line, commit))
+ return -1;
+ if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
+ line[40] = 0;
+ line[81] = 0;
+ sprintf(this_header, "%s (from %s)\n", line, line+41);
+ header = this_header;
+ return diff_tree_sha1_top(parent, commit, "");
+ }
+ line[40] = 0;
+ return diff_tree_commit(commit, line);
+}
+
+static char *diff_tree_usage =
+"git-diff-tree [--stdin] [-m] [-s] [-v] [--pretty] [-t] "
+"[<common diff options>] <tree-ish> <tree-ish>"
+COMMON_DIFF_OPTIONS_HELP;
+
+int main(int argc, const char **argv)
+{
+ int nr_sha1;
+ char line[1000];
+ unsigned char sha1[2][20];
+
+ nr_sha1 = 0;
+ for (;;) {
+ const char *arg;