static int ent_compare(const void *a_, const void *b_)
{
struct treeent *a = *(struct treeent **)a_;
struct treeent *b = *(struct treeent **)b_;
return base_name_compare(a->name, a->len, a->mode,
b->name, b->len, b->mode);
}
static int compare_paths(const struct combine_diff_path *one,
const struct diff_filespec *two)
{
if (!S_ISDIR(one->mode) && !S_ISDIR(two->mode))
return strcmp(one->path, two->path);
return base_name_compare(one->path, strlen(one->path), one->mode,
two->path, strlen(two->path), two->mode);
}
static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2, const char *base, int baselen, struct diff_options *opt)
{
unsigned mode1, mode2;
const char *path1, *path2;
const unsigned char *sha1, *sha2;
int cmp, pathlen1, pathlen2;
char *fullname;
sha1 = tree_entry_extract(t1, &path1, &mode1);
sha2 = tree_entry_extract(t2, &path2, &mode2);
pathlen1 = tree_entry_len(path1, sha1);
pathlen2 = tree_entry_len(path2, sha2);
cmp = base_name_compare(path1, pathlen1, mode1, path2, pathlen2, mode2);
if (cmp < 0) {
show_entry(opt, "-", t1, base, baselen);
return -1;
}
if (cmp > 0) {
show_entry(opt, "+", t2, base, baselen);
return 1;
}
if (!DIFF_OPT_TST(opt, FIND_COPIES_HARDER) && !hashcmp(sha1, sha2) && mode1 == mode2)
return 0;
/*
* If the filemode has changed to/from a directory from/to a regular
* file, we need to consider it a remove and an add.
*/
if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
show_entry(opt, "-", t1, base, baselen);
show_entry(opt, "+", t2, base, baselen);
return 0;
}
if (DIFF_OPT_TST(opt, RECURSIVE) && S_ISDIR(mode1)) {
int retval;
char *newbase = malloc_base(base, baselen, path1, pathlen1);
if (DIFF_OPT_TST(opt, TREE_IN_RECURSIVE)) {
newbase[baselen + pathlen1] = 0;
opt->change(opt, mode1, mode2,
sha1, sha2, newbase);
newbase[baselen + pathlen1] = '/';
}
retval = diff_tree_sha1(sha1, sha2, newbase, opt);
free(newbase);
return retval;
}
fullname = malloc_fullname(base, baselen, path1, pathlen1);
opt->change(opt, mode1, mode2, sha1, sha2, fullname);
free(fullname);
return 0;
}
static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2,
struct strbuf *base, struct diff_options *opt)
{
unsigned mode1, mode2;
const char *path1, *path2;
const unsigned char *sha1, *sha2;
int cmp, pathlen1, pathlen2;
int old_baselen = base->len;
sha1 = tree_entry_extract(t1, &path1, &mode1);
sha2 = tree_entry_extract(t2, &path2, &mode2);
pathlen1 = tree_entry_len(path1, sha1);
pathlen2 = tree_entry_len(path2, sha2);
cmp = base_name_compare(path1, pathlen1, mode1, path2, pathlen2, mode2);
if (cmp < 0) {
show_entry(opt, "-", t1, base);
return -1;
}
if (cmp > 0) {
show_entry(opt, "+", t2, base);
return 1;
}
if (!DIFF_OPT_TST(opt, FIND_COPIES_HARDER) && !hashcmp(sha1, sha2) && mode1 == mode2)
return 0;
/*
* If the filemode has changed to/from a directory from/to a regular
* file, we need to consider it a remove and an add.
*/
if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
show_entry(opt, "-", t1, base);
show_entry(opt, "+", t2, base);
return 0;
}
strbuf_add(base, path1, pathlen1);
if (DIFF_OPT_TST(opt, RECURSIVE) && S_ISDIR(mode1)) {
if (DIFF_OPT_TST(opt, TREE_IN_RECURSIVE)) {
opt->change(opt, mode1, mode2,
sha1, sha2, base->buf, 0, 0);
}
strbuf_addch(base, '/');
diff_tree_sha1(sha1, sha2, base->buf, opt);
} else {
opt->change(opt, mode1, mode2, sha1, sha2, base->buf, 0, 0);
}
strbuf_setlen(base, old_baselen);
return 0;
}
static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2, const char *base, struct diff_options *opt)
{
unsigned mode1, mode2;
const char *path1, *path2;
const unsigned char *sha1, *sha2;
int cmp, pathlen1, pathlen2;
sha1 = extract(t1, &path1, &mode1);
sha2 = extract(t2, &path2, &mode2);
pathlen1 = strlen(path1);
pathlen2 = strlen(path2);
cmp = base_name_compare(path1, pathlen1, mode1, path2, pathlen2, mode2);
if (cmp < 0) {
show_entry(opt, "-", t1, base);
return -1;
}
if (cmp > 0) {
show_entry(opt, "+", t2, base);
return 1;
}
if (!opt->find_copies_harder &&
!memcmp(sha1, sha2, 20) && mode1 == mode2)
return 0;
/*
* If the filemode has changed to/from a directory from/to a regular
* file, we need to consider it a remove and an add.
*/
if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
show_entry(opt, "-", t1, base);
show_entry(opt, "+", t2, base);
return 0;
}
if (opt->recursive && S_ISDIR(mode1)) {
int retval;
char *newbase = malloc_base(base, path1, pathlen1);
if (opt->tree_in_recursive)
opt->change(opt, mode1, mode2,
sha1, sha2, base, path1);
retval = diff_tree_sha1(sha1, sha2, newbase, opt);
free(newbase);
return retval;
}
opt->change(opt, mode1, mode2, sha1, sha2, base, path1);
return 0;
}
/*
* Compare two tree entries, taking into account only path/S_ISDIR(mode),
* but not their sha1's.
*
* NOTE files and directories *always* compare differently, even when having
* the same name - thanks to base_name_compare().
*
* NOTE empty (=invalid) descriptor(s) take part in comparison as +infty,
* so that they sort *after* valid tree entries.
*
* Due to this convention, if trees are scanned in sorted order, all
* non-empty descriptors will be processed first.
*/
static int tree_entry_pathcmp(struct tree_desc *t1, struct tree_desc *t2)
{
struct name_entry *e1, *e2;
int cmp;
/* empty descriptors sort after valid tree entries */
if (!t1->size)
return t2->size ? 1 : 0;
else if (!t2->size)
return -1;
e1 = &t1->entry;
e2 = &t2->entry;
cmp = base_name_compare(e1->path, tree_entry_len(e1), e1->mode,
e2->path, tree_entry_len(e2), e2->mode);
return cmp;
}
static int base_name_entries_compare(const struct name_entry *a,
const struct name_entry *b)
{
return base_name_compare(a->path, tree_entry_len(a), a->mode,
b->path, tree_entry_len(b), b->mode);
}
/*
* Inspect two trees, and give a score that tells how similar they are.
*/
static int score_trees(const unsigned char *hash1, const unsigned char *hash2)
{
struct tree_desc one;
struct tree_desc two;
void *one_buf, *two_buf;
int score = 0;
enum object_type type;
unsigned long size;
one_buf = read_sha1_file(hash1, &type, &size);
if (!one_buf)
die("unable to read tree (%s)", sha1_to_hex(hash1));
if (type != OBJ_TREE)
die("%s is not a tree", sha1_to_hex(hash1));
init_tree_desc(&one, one_buf, size);
two_buf = read_sha1_file(hash2, &type, &size);
if (!two_buf)
die("unable to read tree (%s)", sha1_to_hex(hash2));
if (type != OBJ_TREE)
die("%s is not a tree", sha1_to_hex(hash2));
init_tree_desc(&two, two_buf, size);
while (one.size | two.size) {
const unsigned char *elem1 = elem1;
const unsigned char *elem2 = elem2;
const char *path1 = path1;
const char *path2 = path2;
unsigned mode1 = mode1;
unsigned mode2 = mode2;
int cmp;
if (one.size)
elem1 = tree_entry_extract(&one, &path1, &mode1);
if (two.size)
elem2 = tree_entry_extract(&two, &path2, &mode2);
if (!one.size) {
/* two has more entries */
score += score_missing(mode2, path2);
update_tree_entry(&two);
continue;
}
if (!two.size) {
/* two lacks this entry */
score += score_missing(mode1, path1);
update_tree_entry(&one);
continue;
}
cmp = base_name_compare(path1, strlen(path1), mode1,
path2, strlen(path2), mode2);
if (cmp < 0) {
/* path1 does not appear in two */
score += score_missing(mode1, path1);
update_tree_entry(&one);
continue;
}
else if (cmp > 0) {
/* path2 does not appear in one */
score += score_missing(mode2, path2);
update_tree_entry(&two);
continue;
}
else if (hashcmp(elem1, elem2))
/* they are different */
score += score_differs(mode1, mode2, path1);
else
/* same subtree or blob */
score += score_matches(mode1, mode2, path1);
update_tree_entry(&one);
update_tree_entry(&two);
}
free(one_buf);
free(two_buf);
return score;
}
