Make 'traverse_tree()' use linked structure rather than 'const char *base'

This makes the calling convention a bit less obvious, but a lot more
flexible.  Instead of allocating and extending a new 'base' string, we
just link the top-most name into a linked list of the 'info' structure
when traversing a subdirectory, and we can generate the basename by
following the list.

Perhaps even more importantly, the linked list of info structures also
gives us a place to naturally save off other information than just the
directory name.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Linus Torvalds 2008-03-05 18:59:29 -08:00 коммит произвёл Junio C Hamano
Родитель 0ab9e1e8cd
Коммит 40d934df72
3 изменённых файлов: 78 добавлений и 28 удалений

Просмотреть файл

@ -168,7 +168,13 @@ static struct merge_list *create_entry(unsigned stage, unsigned mode, const unsi
return res; return res;
} }
static void resolve(const char *base, struct name_entry *branch1, struct name_entry *result) static char *traverse_path(const struct traverse_info *info, const struct name_entry *n)
{
char *path = xmalloc(traverse_path_len(info, n) + 1);
return make_traverse_path(path, info, n);
}
static void resolve(const struct traverse_info *info, struct name_entry *branch1, struct name_entry *result)
{ {
struct merge_list *orig, *final; struct merge_list *orig, *final;
const char *path; const char *path;
@ -177,7 +183,7 @@ static void resolve(const char *base, struct name_entry *branch1, struct name_en
if (!branch1) if (!branch1)
return; return;
path = xstrdup(mkpath("%s%s", base, result->path)); path = traverse_path(info, result);
orig = create_entry(2, branch1->mode, branch1->sha1, path); orig = create_entry(2, branch1->mode, branch1->sha1, path);
final = create_entry(0, result->mode, result->sha1, path); final = create_entry(0, result->mode, result->sha1, path);
@ -186,9 +192,8 @@ static void resolve(const char *base, struct name_entry *branch1, struct name_en
add_merge_entry(final); add_merge_entry(final);
} }
static int unresolved_directory(const char *base, struct name_entry n[3]) static int unresolved_directory(const struct traverse_info *info, struct name_entry n[3])
{ {
int baselen, pathlen;
char *newbase; char *newbase;
struct name_entry *p; struct name_entry *p;
struct tree_desc t[3]; struct tree_desc t[3];
@ -204,13 +209,7 @@ static int unresolved_directory(const char *base, struct name_entry n[3])
} }
if (!S_ISDIR(p->mode)) if (!S_ISDIR(p->mode))
return 0; return 0;
baselen = strlen(base); newbase = traverse_path(info, p);
pathlen = tree_entry_len(p->path, p->sha1);
newbase = xmalloc(baselen + pathlen + 2);
memcpy(newbase, base, baselen);
memcpy(newbase + baselen, p->path, pathlen);
memcpy(newbase + baselen + pathlen, "/", 2);
buf0 = fill_tree_descriptor(t+0, n[0].sha1); buf0 = fill_tree_descriptor(t+0, n[0].sha1);
buf1 = fill_tree_descriptor(t+1, n[1].sha1); buf1 = fill_tree_descriptor(t+1, n[1].sha1);
buf2 = fill_tree_descriptor(t+2, n[2].sha1); buf2 = fill_tree_descriptor(t+2, n[2].sha1);
@ -224,7 +223,7 @@ static int unresolved_directory(const char *base, struct name_entry n[3])
} }
static struct merge_list *link_entry(unsigned stage, const char *base, struct name_entry *n, struct merge_list *entry) static struct merge_list *link_entry(unsigned stage, const struct traverse_info *info, struct name_entry *n, struct merge_list *entry)
{ {
const char *path; const char *path;
struct merge_list *link; struct merge_list *link;
@ -234,17 +233,17 @@ static struct merge_list *link_entry(unsigned stage, const char *base, struct na
if (entry) if (entry)
path = entry->path; path = entry->path;
else else
path = xstrdup(mkpath("%s%s", base, n->path)); path = traverse_path(info, n);
link = create_entry(stage, n->mode, n->sha1, path); link = create_entry(stage, n->mode, n->sha1, path);
link->link = entry; link->link = entry;
return link; return link;
} }
static void unresolved(const char *base, struct name_entry n[3]) static void unresolved(const struct traverse_info *info, struct name_entry n[3])
{ {
struct merge_list *entry = NULL; struct merge_list *entry = NULL;
if (unresolved_directory(base, n)) if (unresolved_directory(info, n))
return; return;
/* /*
@ -252,9 +251,9 @@ static void unresolved(const char *base, struct name_entry n[3])
* list has the stages in order - link_entry adds new * list has the stages in order - link_entry adds new
* links at the front. * links at the front.
*/ */
entry = link_entry(3, base, n + 2, entry); entry = link_entry(3, info, n + 2, entry);
entry = link_entry(2, base, n + 1, entry); entry = link_entry(2, info, n + 1, entry);
entry = link_entry(1, base, n + 0, entry); entry = link_entry(1, info, n + 0, entry);
add_merge_entry(entry); add_merge_entry(entry);
} }
@ -288,36 +287,40 @@ static void unresolved(const char *base, struct name_entry n[3])
* The successful merge rules are the same as for the three-way merge * The successful merge rules are the same as for the three-way merge
* in git-read-tree. * in git-read-tree.
*/ */
static void threeway_callback(int n, unsigned long mask, struct name_entry *entry, const char *base) static void threeway_callback(int n, unsigned long mask, struct name_entry *entry, struct traverse_info *info)
{ {
/* Same in both? */ /* Same in both? */
if (same_entry(entry+1, entry+2)) { if (same_entry(entry+1, entry+2)) {
if (entry[0].sha1) { if (entry[0].sha1) {
resolve(base, NULL, entry+1); resolve(info, NULL, entry+1);
return; return;
} }
} }
if (same_entry(entry+0, entry+1)) { if (same_entry(entry+0, entry+1)) {
if (entry[2].sha1 && !S_ISDIR(entry[2].mode)) { if (entry[2].sha1 && !S_ISDIR(entry[2].mode)) {
resolve(base, entry+1, entry+2); resolve(info, entry+1, entry+2);
return; return;
} }
} }
if (same_entry(entry+0, entry+2)) { if (same_entry(entry+0, entry+2)) {
if (entry[1].sha1 && !S_ISDIR(entry[1].mode)) { if (entry[1].sha1 && !S_ISDIR(entry[1].mode)) {
resolve(base, NULL, entry+1); resolve(info, NULL, entry+1);
return; return;
} }
} }
unresolved(base, entry); unresolved(info, entry);
} }
static void merge_trees(struct tree_desc t[3], const char *base) static void merge_trees(struct tree_desc t[3], const char *base)
{ {
traverse_trees(3, t, base, threeway_callback); struct traverse_info info;
setup_traverse_info(&info, base);
info.fn = threeway_callback;
traverse_trees(3, t, &info);
} }
static void *get_tree_descriptor(struct tree_desc *desc, const char *rev) static void *get_tree_descriptor(struct tree_desc *desc, const char *rev)

Просмотреть файл

@ -104,7 +104,38 @@ int tree_entry(struct tree_desc *desc, struct name_entry *entry)
return 1; return 1;
} }
void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback) void setup_traverse_info(struct traverse_info *info, const char *base)
{
int pathlen = strlen(base);
memset(info, 0, sizeof(*info));
if (pathlen && base[pathlen-1] == '/')
pathlen--;
info->pathlen = pathlen ? pathlen + 1 : 0;
info->name.path = base;
info->name.sha1 = (void *)(base + pathlen + 1);
}
char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n)
{
int len = tree_entry_len(n->path, n->sha1);
int pathlen = info->pathlen;
path[pathlen + len] = 0;
for (;;) {
memcpy(path + pathlen, n->path, len);
if (!pathlen)
break;
path[--pathlen] = '/';
n = &info->name;
len = tree_entry_len(n->path, n->sha1);
info = info->prev;
pathlen -= len;
}
return path;
}
void traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
{ {
struct name_entry *entry = xmalloc(n*sizeof(*entry)); struct name_entry *entry = xmalloc(n*sizeof(*entry));
@ -150,7 +181,7 @@ void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callb
} }
entry_clear(entry + i); entry_clear(entry + i);
} }
callback(n, mask, entry, base); info->fn(n, mask, entry, info);
} }
free(entry); free(entry);
} }

Просмотреть файл

@ -33,10 +33,26 @@ int tree_entry(struct tree_desc *, struct name_entry *);
void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1); void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1);
typedef void (*traverse_callback_t)(int n, unsigned long mask, struct name_entry *entry, const char *base); struct traverse_info;
typedef void (*traverse_callback_t)(int n, unsigned long mask, struct name_entry *entry, struct traverse_info *);
void traverse_trees(int n, struct tree_desc *t, struct traverse_info *info);
void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback); struct traverse_info {
struct traverse_info *prev;
struct name_entry name;
int pathlen;
traverse_callback_t fn;
void *data;
};
int get_tree_entry(const unsigned char *, const char *, unsigned char *, unsigned *); int get_tree_entry(const unsigned char *, const char *, unsigned char *, unsigned *);
extern char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n);
extern void setup_traverse_info(struct traverse_info *info, const char *base);
static inline int traverse_path_len(const struct traverse_info *info, const struct name_entry *n)
{
return info->pathlen + tree_entry_len(n->path, n->sha1);
}
#endif #endif