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iterator.c
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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "iterator.h"
#include "tree.h"
#include "index.h"
#include "ignore.h"
#include "buffer.h"
#include "git2/submodule.h"
#include <ctype.h>
#define ITERATOR_SET_CB(P,NAME_LC) do { \
(P)->cb.current = NAME_LC ## _iterator__current; \
(P)->cb.advance = NAME_LC ## _iterator__advance; \
(P)->cb.advance_into = NAME_LC ## _iterator__advance_into; \
(P)->cb.seek = NAME_LC ## _iterator__seek; \
(P)->cb.reset = NAME_LC ## _iterator__reset; \
(P)->cb.at_end = NAME_LC ## _iterator__at_end; \
(P)->cb.free = NAME_LC ## _iterator__free; \
} while (0)
#define ITERATOR_CASE_FLAGS \
(GIT_ITERATOR_IGNORE_CASE | GIT_ITERATOR_DONT_IGNORE_CASE)
#define ITERATOR_BASE_INIT(P,NAME_LC,NAME_UC,REPO) do { \
(P)->base.type = GIT_ITERATOR_TYPE_ ## NAME_UC; \
(P)->base.cb = &(P)->cb; \
ITERATOR_SET_CB(P,NAME_LC); \
(P)->base.repo = (REPO); \
(P)->base.start = start ? git__strdup(start) : NULL; \
(P)->base.end = end ? git__strdup(end) : NULL; \
if ((start && !(P)->base.start) || (end && !(P)->base.end)) { \
git__free(P); return -1; } \
(P)->base.prefixcomp = git__prefixcmp; \
(P)->base.flags = flags & ~ITERATOR_CASE_FLAGS; \
if ((P)->base.flags & GIT_ITERATOR_DONT_AUTOEXPAND) \
(P)->base.flags |= GIT_ITERATOR_INCLUDE_TREES; \
} while (0)
#define iterator__flag(I,F) ((((git_iterator *)(I))->flags & GIT_ITERATOR_ ## F) != 0)
#define iterator__ignore_case(I) iterator__flag(I,IGNORE_CASE)
#define iterator__include_trees(I) iterator__flag(I,INCLUDE_TREES)
#define iterator__dont_autoexpand(I) iterator__flag(I,DONT_AUTOEXPAND)
#define iterator__do_autoexpand(I) !iterator__flag(I,DONT_AUTOEXPAND)
#define GIT_ITERATOR_FIRST_ACCESS (1 << 15)
#define iterator__has_been_accessed(I) iterator__flag(I,FIRST_ACCESS)
#define iterator__end(I) ((git_iterator *)(I))->end
#define iterator__past_end(I,PATH) \
(iterator__end(I) && ((git_iterator *)(I))->prefixcomp((PATH),iterator__end(I)) > 0)
static int iterator__reset_range(
git_iterator *iter, const char *start, const char *end)
{
if (start) {
if (iter->start)
git__free(iter->start);
iter->start = git__strdup(start);
GITERR_CHECK_ALLOC(iter->start);
}
if (end) {
if (iter->end)
git__free(iter->end);
iter->end = git__strdup(end);
GITERR_CHECK_ALLOC(iter->end);
}
iter->flags &= ~GIT_ITERATOR_FIRST_ACCESS;
return 0;
}
static int iterator__update_ignore_case(
git_iterator *iter,
git_iterator_flag_t flags)
{
int error = 0, ignore_case = -1;
if ((flags & GIT_ITERATOR_IGNORE_CASE) != 0)
ignore_case = true;
else if ((flags & GIT_ITERATOR_DONT_IGNORE_CASE) != 0)
ignore_case = false;
else {
git_index *index;
if (!(error = git_repository_index__weakptr(&index, iter->repo)))
ignore_case = (index->ignore_case != false);
}
if (ignore_case > 0)
iter->flags = (iter->flags | GIT_ITERATOR_IGNORE_CASE);
else if (ignore_case == 0)
iter->flags = (iter->flags & ~GIT_ITERATOR_IGNORE_CASE);
iter->prefixcomp = iterator__ignore_case(iter) ?
git__prefixcmp_icase : git__prefixcmp;
return error;
}
GIT_INLINE(void) iterator__clear_entry(const git_index_entry **entry)
{
if (entry) *entry = NULL;
}
static int empty_iterator__noop(const git_index_entry **e, git_iterator *i)
{
GIT_UNUSED(i);
iterator__clear_entry(e);
return GIT_ITEROVER;
}
static int empty_iterator__seek(git_iterator *i, const char *p)
{
GIT_UNUSED(i); GIT_UNUSED(p);
return -1;
}
static int empty_iterator__reset(git_iterator *i, const char *s, const char *e)
{
GIT_UNUSED(i); GIT_UNUSED(s); GIT_UNUSED(e);
return 0;
}
static int empty_iterator__at_end(git_iterator *i)
{
GIT_UNUSED(i);
return 1;
}
static void empty_iterator__free(git_iterator *i)
{
GIT_UNUSED(i);
}
typedef struct {
git_iterator base;
git_iterator_callbacks cb;
} empty_iterator;
int git_iterator_for_nothing(
git_iterator **iter,
git_iterator_flag_t flags,
const char *start,
const char *end)
{
empty_iterator *i = git__calloc(1, sizeof(empty_iterator));
GITERR_CHECK_ALLOC(i);
#define empty_iterator__current empty_iterator__noop
#define empty_iterator__advance empty_iterator__noop
#define empty_iterator__advance_into empty_iterator__noop
ITERATOR_BASE_INIT(i, empty, EMPTY, NULL);
if ((flags & GIT_ITERATOR_IGNORE_CASE) != 0)
i->base.flags |= GIT_ITERATOR_IGNORE_CASE;
*iter = (git_iterator *)i;
return 0;
}
typedef struct tree_iterator_entry tree_iterator_entry;
struct tree_iterator_entry {
tree_iterator_entry *parent;
const git_tree_entry *te;
git_tree *tree;
};
typedef struct tree_iterator_frame tree_iterator_frame;
struct tree_iterator_frame {
tree_iterator_frame *up, *down;
size_t n_entries; /* items in this frame */
size_t current; /* start of currently active range in frame */
size_t next; /* start of next range in frame */
const char *start;
size_t startlen;
tree_iterator_entry *entries[GIT_FLEX_ARRAY];
};
typedef struct {
git_iterator base;
git_iterator_callbacks cb;
tree_iterator_frame *head, *root;
git_pool pool;
git_index_entry entry;
git_buf path;
int path_ambiguities;
bool path_has_filename;
bool entry_is_current;
int (*strncomp)(const char *a, const char *b, size_t sz);
} tree_iterator;
static char *tree_iterator__current_filename(
tree_iterator *ti, const git_tree_entry *te)
{
if (!ti->path_has_filename) {
if (git_buf_joinpath(&ti->path, ti->path.ptr, te->filename) < 0)
return NULL;
if (git_tree_entry__is_tree(te) && git_buf_putc(&ti->path, '/') < 0)
return NULL;
ti->path_has_filename = true;
}
return ti->path.ptr;
}
static void tree_iterator__rewrite_filename(tree_iterator *ti)
{
tree_iterator_entry *scan = ti->head->entries[ti->head->current];
ssize_t strpos = ti->path.size;
const git_tree_entry *te;
if (strpos && ti->path.ptr[strpos - 1] == '/')
strpos--;
for (; scan && (te = scan->te); scan = scan->parent) {
strpos -= te->filename_len;
memcpy(&ti->path.ptr[strpos], te->filename, te->filename_len);
strpos -= 1; /* separator */
}
}
static int tree_iterator__te_cmp(
const git_tree_entry *a,
const git_tree_entry *b,
int (*compare)(const char *, const char *, size_t))
{
return git_path_cmp(
a->filename, a->filename_len, a->attr == GIT_FILEMODE_TREE,
b->filename, b->filename_len, b->attr == GIT_FILEMODE_TREE,
compare);
}
static int tree_iterator__ci_cmp(const void *a, const void *b, void *p)
{
const tree_iterator_entry *ae = a, *be = b;
int cmp = tree_iterator__te_cmp(ae->te, be->te, git__strncasecmp);
if (!cmp) {
/* stabilize sort order among equivalent names */
if (!ae->parent->te || !be->parent->te)
cmp = tree_iterator__te_cmp(ae->te, be->te, git__strncmp);
else
cmp = tree_iterator__ci_cmp(ae->parent, be->parent, p);
}
return cmp;
}
static int tree_iterator__search_cmp(const void *key, const void *val, void *p)
{
const tree_iterator_frame *tf = key;
const git_tree_entry *te = ((tree_iterator_entry *)val)->te;
return git_path_cmp(
tf->start, tf->startlen, false,
te->filename, te->filename_len, te->attr == GIT_FILEMODE_TREE,
((tree_iterator *)p)->strncomp);
}
static bool tree_iterator__move_to_next(
tree_iterator *ti, tree_iterator_frame *tf)
{
if (tf->next > tf->current + 1)
ti->path_ambiguities--;
if (!tf->up) { /* at root */
tf->current = tf->next;
return false;
}
for (; tf->current < tf->next; tf->current++) {
git_tree_free(tf->entries[tf->current]->tree);
tf->entries[tf->current]->tree = NULL;
}
return (tf->current < tf->n_entries);
}
static int tree_iterator__set_next(tree_iterator *ti, tree_iterator_frame *tf)
{
int error = 0;
const git_tree_entry *te, *last = NULL;
tf->next = tf->current;
for (; tf->next < tf->n_entries; tf->next++, last = te) {
te = tf->entries[tf->next]->te;
if (last && tree_iterator__te_cmp(last, te, ti->strncomp))
break;
/* try to load trees for items in [current,next) range */
if (!error && git_tree_entry__is_tree(te))
error = git_tree_lookup(
&tf->entries[tf->next]->tree, ti->base.repo, &te->oid);
}
if (tf->next > tf->current + 1)
ti->path_ambiguities++;
/* if a tree lookup failed, advance over this span and return failure */
if (error < 0) {
tree_iterator__move_to_next(ti, tf);
return error;
}
if (last && !tree_iterator__current_filename(ti, last))
return -1; /* must have been allocation failure */
return 0;
}
GIT_INLINE(bool) tree_iterator__at_tree(tree_iterator *ti)
{
return (ti->head->current < ti->head->n_entries &&
ti->head->entries[ti->head->current]->tree != NULL);
}
static int tree_iterator__push_frame(tree_iterator *ti)
{
int error = 0;
tree_iterator_frame *head = ti->head, *tf = NULL;
size_t i, n_entries = 0;
if (head->current >= head->n_entries || !head->entries[head->current]->tree)
return GIT_ITEROVER;
for (i = head->current; i < head->next; ++i)
n_entries += git_tree_entrycount(head->entries[i]->tree);
tf = git__calloc(sizeof(tree_iterator_frame) +
n_entries * sizeof(tree_iterator_entry *), 1);
GITERR_CHECK_ALLOC(tf);
tf->n_entries = n_entries;
tf->up = head;
head->down = tf;
ti->head = tf;
for (i = head->current, n_entries = 0; i < head->next; ++i) {
git_tree *tree = head->entries[i]->tree;
size_t j, max_j = git_tree_entrycount(tree);
for (j = 0; j < max_j; ++j) {
tree_iterator_entry *entry = git_pool_malloc(&ti->pool, 1);
GITERR_CHECK_ALLOC(entry);
entry->parent = head->entries[i];
entry->te = git_tree_entry_byindex(tree, j);
entry->tree = NULL;
tf->entries[n_entries++] = entry;
}
}
/* if ignore_case, sort entries case insensitively */
if (iterator__ignore_case(ti))
git__tsort_r(
(void **)tf->entries, tf->n_entries, tree_iterator__ci_cmp, tf);
/* pick tf->current based on "start" (or start at zero) */
if (head->startlen > 0) {
git__bsearch_r((void **)tf->entries, tf->n_entries, head,
tree_iterator__search_cmp, ti, &tf->current);
while (tf->current &&
!tree_iterator__search_cmp(head, tf->entries[tf->current-1], ti))
tf->current--;
if ((tf->start = strchr(head->start, '/')) != NULL) {
tf->start++;
tf->startlen = strlen(tf->start);
}
}
ti->path_has_filename = ti->entry_is_current = false;
if ((error = tree_iterator__set_next(ti, tf)) < 0)
return error;
/* autoexpand as needed */
if (!iterator__include_trees(ti) && tree_iterator__at_tree(ti))
return tree_iterator__push_frame(ti);
return 0;
}
static bool tree_iterator__pop_frame(tree_iterator *ti, bool final)
{
tree_iterator_frame *tf = ti->head;
if (!tf->up)
return false;
ti->head = tf->up;
ti->head->down = NULL;
tree_iterator__move_to_next(ti, tf);
if (!final) { /* if final, don't bother to clean up */
git_pool_free_array(&ti->pool, tf->n_entries, (void **)tf->entries);
git_buf_rtruncate_at_char(&ti->path, '/');
}
git__free(tf);
return true;
}
static void tree_iterator__pop_all(tree_iterator *ti, bool to_end, bool final)
{
while (tree_iterator__pop_frame(ti, final)) /* pop to root */;
if (!final) {
ti->head->current = to_end ? ti->head->n_entries : 0;
ti->path_ambiguities = 0;
git_buf_clear(&ti->path);
}
}
static int tree_iterator__update_entry(tree_iterator *ti)
{
tree_iterator_frame *tf;
const git_tree_entry *te;
if (ti->entry_is_current)
return 0;
tf = ti->head;
te = tf->entries[tf->current]->te;
ti->entry.mode = te->attr;
git_oid_cpy(&ti->entry.oid, &te->oid);
ti->entry.path = tree_iterator__current_filename(ti, te);
GITERR_CHECK_ALLOC(ti->entry.path);
if (ti->path_ambiguities > 0)
tree_iterator__rewrite_filename(ti);
if (iterator__past_end(ti, ti->entry.path)) {
tree_iterator__pop_all(ti, true, false);
return GIT_ITEROVER;
}
ti->entry_is_current = true;
return 0;
}
static int tree_iterator__current(
const git_index_entry **entry, git_iterator *self)
{
int error;
tree_iterator *ti = (tree_iterator *)self;
tree_iterator_frame *tf = ti->head;
iterator__clear_entry(entry);
if (tf->current >= tf->n_entries)
return GIT_ITEROVER;
if ((error = tree_iterator__update_entry(ti)) < 0)
return error;
if (entry)
*entry = &ti->entry;
ti->base.flags |= GIT_ITERATOR_FIRST_ACCESS;
return 0;
}
static int tree_iterator__advance_into(
const git_index_entry **entry, git_iterator *self)
{
int error = 0;
tree_iterator *ti = (tree_iterator *)self;
iterator__clear_entry(entry);
if (tree_iterator__at_tree(ti))
error = tree_iterator__push_frame(ti);
if (!error && entry)
error = tree_iterator__current(entry, self);
return error;
}
static int tree_iterator__advance(
const git_index_entry **entry, git_iterator *self)
{
int error;
tree_iterator *ti = (tree_iterator *)self;
tree_iterator_frame *tf = ti->head;
iterator__clear_entry(entry);
if (tf->current >= tf->n_entries)
return GIT_ITEROVER;
if (!iterator__has_been_accessed(ti))
return tree_iterator__current(entry, self);
if (iterator__do_autoexpand(ti) && iterator__include_trees(ti) &&
tree_iterator__at_tree(ti))
return tree_iterator__advance_into(entry, self);
if (ti->path_has_filename) {
git_buf_rtruncate_at_char(&ti->path, '/');
ti->path_has_filename = ti->entry_is_current = false;
}
/* scan forward and up, advancing in frame or popping frame when done */
while (!tree_iterator__move_to_next(ti, tf) &&
tree_iterator__pop_frame(ti, false))
tf = ti->head;
/* find next and load trees */
if ((error = tree_iterator__set_next(ti, tf)) < 0)
return error;
/* deal with include_trees / auto_expand as needed */
if (!iterator__include_trees(ti) && tree_iterator__at_tree(ti))
return tree_iterator__advance_into(entry, self);
return tree_iterator__current(entry, self);
}
static int tree_iterator__seek(git_iterator *self, const char *prefix)
{
GIT_UNUSED(self); GIT_UNUSED(prefix);
return -1;
}
static int tree_iterator__reset(
git_iterator *self, const char *start, const char *end)
{
tree_iterator *ti = (tree_iterator *)self;
tree_iterator__pop_all(ti, false, false);
if (iterator__reset_range(self, start, end) < 0)
return -1;
return tree_iterator__push_frame(ti); /* re-expand root tree */
}
static int tree_iterator__at_end(git_iterator *self)
{
tree_iterator *ti = (tree_iterator *)self;
return (ti->head->current >= ti->head->n_entries);
}
static void tree_iterator__free(git_iterator *self)
{
tree_iterator *ti = (tree_iterator *)self;
tree_iterator__pop_all(ti, true, false);
git_tree_free(ti->head->entries[0]->tree);
git__free(ti->head);
git_pool_clear(&ti->pool);
git_buf_free(&ti->path);
}
static int tree_iterator__create_root_frame(tree_iterator *ti, git_tree *tree)
{
size_t sz = sizeof(tree_iterator_frame) + sizeof(tree_iterator_entry);
tree_iterator_frame *root = git__calloc(sz, sizeof(char));
GITERR_CHECK_ALLOC(root);
root->n_entries = 1;
root->next = 1;
root->start = ti->base.start;
root->startlen = root->start ? strlen(root->start) : 0;
root->entries[0] = git_pool_mallocz(&ti->pool, 1);
GITERR_CHECK_ALLOC(root->entries[0]);
root->entries[0]->tree = tree;
ti->head = ti->root = root;
return 0;
}
int git_iterator_for_tree(
git_iterator **iter,
git_tree *tree,
git_iterator_flag_t flags,
const char *start,
const char *end)
{
int error;
tree_iterator *ti;
if (tree == NULL)
return git_iterator_for_nothing(iter, flags, start, end);
if ((error = git_object_dup((git_object **)&tree, (git_object *)tree)) < 0)
return error;
ti = git__calloc(1, sizeof(tree_iterator));
GITERR_CHECK_ALLOC(ti);
ITERATOR_BASE_INIT(ti, tree, TREE, git_tree_owner(tree));
if ((error = iterator__update_ignore_case((git_iterator *)ti, flags)) < 0)
goto fail;
ti->strncomp = iterator__ignore_case(ti) ? git__strncasecmp : git__strncmp;
if ((error = git_pool_init(&ti->pool, sizeof(tree_iterator_entry),0)) < 0 ||
(error = tree_iterator__create_root_frame(ti, tree)) < 0 ||
(error = tree_iterator__push_frame(ti)) < 0) /* expand root now */
goto fail;
*iter = (git_iterator *)ti;
return 0;
fail:
git_iterator_free((git_iterator *)ti);
return error;
}
typedef struct {
git_iterator base;
git_iterator_callbacks cb;
git_index *index;
size_t current;
/* when not in autoexpand mode, use these to represent "tree" state */
git_buf partial;
size_t partial_pos;
char restore_terminator;
git_index_entry tree_entry;
} index_iterator;
static const git_index_entry *index_iterator__index_entry(index_iterator *ii)
{
const git_index_entry *ie = git_index_get_byindex(ii->index, ii->current);
if (ie != NULL && iterator__past_end(ii, ie->path)) {
ii->current = git_index_entrycount(ii->index);
ie = NULL;
}
return ie;
}
static const git_index_entry *index_iterator__skip_conflicts(index_iterator *ii)
{
const git_index_entry *ie;
while ((ie = index_iterator__index_entry(ii)) != NULL &&
git_index_entry_stage(ie) != 0)
ii->current++;
return ie;
}
static void index_iterator__next_prefix_tree(index_iterator *ii)
{
const char *slash;
if (!iterator__include_trees(ii))
return;
slash = strchr(&ii->partial.ptr[ii->partial_pos], '/');
if (slash != NULL) {
ii->partial_pos = (slash - ii->partial.ptr) + 1;
ii->restore_terminator = ii->partial.ptr[ii->partial_pos];
ii->partial.ptr[ii->partial_pos] = '\0';
} else {
ii->partial_pos = ii->partial.size;
}
if (index_iterator__index_entry(ii) == NULL)
ii->partial_pos = ii->partial.size;
}
static int index_iterator__first_prefix_tree(index_iterator *ii)
{
const git_index_entry *ie = index_iterator__skip_conflicts(ii);
const char *scan, *prior, *slash;
if (!ie || !iterator__include_trees(ii))
return 0;
/* find longest common prefix with prior index entry */
for (scan = slash = ie->path, prior = ii->partial.ptr;
*scan && *scan == *prior; ++scan, ++prior)
if (*scan == '/')
slash = scan;
if (git_buf_sets(&ii->partial, ie->path) < 0)
return -1;
ii->partial_pos = (slash - ie->path) + 1;
index_iterator__next_prefix_tree(ii);
return 0;
}
#define index_iterator__at_tree(I) \
(iterator__include_trees(I) && (I)->partial_pos < (I)->partial.size)
static int index_iterator__current(
const git_index_entry **entry, git_iterator *self)
{
index_iterator *ii = (index_iterator *)self;
const git_index_entry *ie = git_index_get_byindex(ii->index, ii->current);
if (ie != NULL && index_iterator__at_tree(ii)) {
ii->tree_entry.path = ii->partial.ptr;
ie = &ii->tree_entry;
}
if (entry)
*entry = ie;
ii->base.flags |= GIT_ITERATOR_FIRST_ACCESS;
return (ie != NULL) ? 0 : GIT_ITEROVER;
}
static int index_iterator__at_end(git_iterator *self)
{
index_iterator *ii = (index_iterator *)self;
return (ii->current >= git_index_entrycount(ii->index));
}
static int index_iterator__advance(
const git_index_entry **entry, git_iterator *self)
{
index_iterator *ii = (index_iterator *)self;
size_t entrycount = git_index_entrycount(ii->index);
const git_index_entry *ie;
if (!iterator__has_been_accessed(ii))
return index_iterator__current(entry, self);
if (index_iterator__at_tree(ii)) {
if (iterator__do_autoexpand(ii)) {
ii->partial.ptr[ii->partial_pos] = ii->restore_terminator;
index_iterator__next_prefix_tree(ii);
} else {
/* advance to sibling tree (i.e. find entry with new prefix) */
while (ii->current < entrycount) {
ii->current++;
if (!(ie = git_index_get_byindex(ii->index, ii->current)) ||
ii->base.prefixcomp(ie->path, ii->partial.ptr) != 0)
break;
}
if (index_iterator__first_prefix_tree(ii) < 0)
return -1;
}
} else {
if (ii->current < entrycount)
ii->current++;
if (index_iterator__first_prefix_tree(ii) < 0)
return -1;
}
return index_iterator__current(entry, self);
}
static int index_iterator__advance_into(
const git_index_entry **entry, git_iterator *self)
{
index_iterator *ii = (index_iterator *)self;
const git_index_entry *ie = git_index_get_byindex(ii->index, ii->current);
if (ie != NULL && index_iterator__at_tree(ii)) {
if (ii->restore_terminator)
ii->partial.ptr[ii->partial_pos] = ii->restore_terminator;
index_iterator__next_prefix_tree(ii);
}
return index_iterator__current(entry, self);
}
static int index_iterator__seek(git_iterator *self, const char *prefix)
{
GIT_UNUSED(self); GIT_UNUSED(prefix);
return -1;
}
static int index_iterator__reset(
git_iterator *self, const char *start, const char *end)
{
index_iterator *ii = (index_iterator *)self;
const git_index_entry *ie;
if (iterator__reset_range(self, start, end) < 0)
return -1;
ii->current = ii->base.start ?
git_index__prefix_position(ii->index, ii->base.start) : 0;
if ((ie = index_iterator__skip_conflicts(ii)) == NULL)
return 0;
if (git_buf_sets(&ii->partial, ie->path) < 0)
return -1;
ii->partial_pos = 0;
if (ii->base.start) {
size_t startlen = strlen(ii->base.start);
ii->partial_pos = (startlen > ii->partial.size) ?
ii->partial.size : startlen;
}
index_iterator__next_prefix_tree(ii);
return 0;
}
static void index_iterator__free(git_iterator *self)
{
index_iterator *ii = (index_iterator *)self;
git_index_free(ii->index);
ii->index = NULL;
git_buf_free(&ii->partial);
}
int git_iterator_for_index(
git_iterator **iter,
git_index *index,
git_iterator_flag_t flags,
const char *start,
const char *end)
{
index_iterator *ii = git__calloc(1, sizeof(index_iterator));
GITERR_CHECK_ALLOC(ii);
ITERATOR_BASE_INIT(ii, index, INDEX, git_index_owner(index));
if (index->ignore_case) {
ii->base.flags |= GIT_ITERATOR_IGNORE_CASE;
ii->base.prefixcomp = git__prefixcmp_icase;
}
ii->index = index;
GIT_REFCOUNT_INC(index);
git_buf_init(&ii->partial, 0);
ii->tree_entry.mode = GIT_FILEMODE_TREE;
index_iterator__reset((git_iterator *)ii, NULL, NULL);
*iter = (git_iterator *)ii;
return 0;
}
typedef struct fs_iterator_frame fs_iterator_frame;
struct fs_iterator_frame {
fs_iterator_frame *next;
git_vector entries;
size_t index;
};
typedef struct fs_iterator fs_iterator;
struct fs_iterator {
git_iterator base;
git_iterator_callbacks cb;
fs_iterator_frame *stack;
git_index_entry entry;
git_buf path;
size_t root_len;
uint32_t dirload_flags;
int depth;
int (*enter_dir_cb)(fs_iterator *self);
int (*leave_dir_cb)(fs_iterator *self);
int (*update_entry_cb)(fs_iterator *self);
};
#define FS_MAX_DEPTH 100
static fs_iterator_frame *fs_iterator__alloc_frame(fs_iterator *fi)
{
fs_iterator_frame *ff = git__calloc(1, sizeof(fs_iterator_frame));
git_vector_cmp entry_compare = CASESELECT(
iterator__ignore_case(fi),
git_path_with_stat_cmp_icase, git_path_with_stat_cmp);
if (ff && git_vector_init(&ff->entries, 0, entry_compare) < 0) {
git__free(ff);
ff = NULL;
}
return ff;
}
static void fs_iterator__free_frame(fs_iterator_frame *ff)
{
git_vector_free_deep(&ff->entries);
git__free(ff);
}
static void fs_iterator__pop_frame(
fs_iterator *fi, fs_iterator_frame *ff, bool pop_last)
{
if (fi && fi->stack == ff) {
if (!ff->next && !pop_last) {
memset(&fi->entry, 0, sizeof(fi->entry));
return;
}
if (fi->leave_dir_cb)
(void)fi->leave_dir_cb(fi);
fi->stack = ff->next;
fi->depth--;
}
fs_iterator__free_frame(ff);
}
static int fs_iterator__update_entry(fs_iterator *fi);
static int fs_iterator__advance_over(
const git_index_entry **entry, git_iterator *self);
static int fs_iterator__entry_cmp(const void *i, const void *item)
{
const fs_iterator *fi = (const fs_iterator *)i;
const git_path_with_stat *ps = item;
return fi->base.prefixcomp(fi->base.start, ps->path);
}
static void fs_iterator__seek_frame_start(
fs_iterator *fi, fs_iterator_frame *ff)
{
if (!ff)
return;
if (fi->base.start)
git_vector_bsearch2(
&ff->index, &ff->entries, fs_iterator__entry_cmp, fi);
else
ff->index = 0;
}
static int fs_iterator__expand_dir(fs_iterator *fi)
{
int error;
fs_iterator_frame *ff;
if (fi->depth > FS_MAX_DEPTH) {
giterr_set(GITERR_REPOSITORY,
"Directory nesting is too deep (%d)", fi->depth);
return -1;
}
ff = fs_iterator__alloc_frame(fi);
GITERR_CHECK_ALLOC(ff);
error = git_path_dirload_with_stat(
fi->path.ptr, fi->root_len, fi->dirload_flags,
fi->base.start, fi->base.end, &ff->entries);
if (error < 0) {
git_error_state last_error = { 0 };
giterr_capture(&last_error, error);
/* these callbacks may clear the error message */
fs_iterator__free_frame(ff);
fs_iterator__advance_over(NULL, (git_iterator *)fi);
/* next time return value we skipped to */
fi->base.flags &= ~GIT_ITERATOR_FIRST_ACCESS;
return giterr_restore(&last_error);
}