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git/dir-iterator.c

236 lines
5.8 KiB

#include "cache.h"
#include "dir.h"
#include "iterator.h"
#include "dir-iterator.h"
struct dir_iterator_level {
DIR *dir;
/*
* The length of the directory part of path at this level
* (including a trailing '/'):
*/
size_t prefix_len;
};
/*
* The full data structure used to manage the internal directory
* iteration state. It includes members that are not part of the
* public interface.
*/
struct dir_iterator_int {
struct dir_iterator base;
/*
* The number of levels currently on the stack. After the first
* call to dir_iterator_begin(), if it succeeds to open the
* first level's dir, this will always be at least 1. Then,
* when it comes to zero the iteration is ended and this
* struct is freed.
*/
size_t levels_nr;
/* The number of levels that have been allocated on the stack */
size_t levels_alloc;
/*
* A stack of levels. levels[0] is the uppermost directory
* that will be included in this iteration.
*/
struct dir_iterator_level *levels;
/* Combination of flags for this dir-iterator */
unsigned int flags;
};
/*
* Push a level in the iter stack and initialize it with information from
* the directory pointed by iter->base->path. It is assumed that this
* strbuf points to a valid directory path. Return 0 on success and -1
* otherwise, setting errno accordingly and leaving the stack unchanged.
*/
static int push_level(struct dir_iterator_int *iter)
{
struct dir_iterator_level *level;
ALLOC_GROW(iter->levels, iter->levels_nr + 1, iter->levels_alloc);
level = &iter->levels[iter->levels_nr++];
if (!is_dir_sep(iter->base.path.buf[iter->base.path.len - 1]))
strbuf_addch(&iter->base.path, '/');
level->prefix_len = iter->base.path.len;
level->dir = opendir(iter->base.path.buf);
if (!level->dir) {
int saved_errno = errno;
if (errno != ENOENT) {
warning_errno("error opening directory '%s'",
iter->base.path.buf);
}
iter->levels_nr--;
errno = saved_errno;
return -1;
}
return 0;
}
/*
* Pop the top level on the iter stack, releasing any resources associated
* with it. Return the new value of iter->levels_nr.
*/
static int pop_level(struct dir_iterator_int *iter)
{
struct dir_iterator_level *level =
&iter->levels[iter->levels_nr - 1];
if (level->dir && closedir(level->dir))
warning_errno("error closing directory '%s'",
iter->base.path.buf);
level->dir = NULL;
return --iter->levels_nr;
}
/*
* Populate iter->base with the necessary information on the next iteration
* entry, represented by the given dirent de. Return 0 on success and -1
* otherwise, setting errno accordingly.
*/
static int prepare_next_entry_data(struct dir_iterator_int *iter,
struct dirent *de)
{
int err, saved_errno;
strbuf_addstr(&iter->base.path, de->d_name);
/*
* We have to reset these because the path strbuf might have
* been realloc()ed at the previous strbuf_addstr().
*/
iter->base.relative_path = iter->base.path.buf +
iter->levels[0].prefix_len;
iter->base.basename = iter->base.path.buf +
iter->levels[iter->levels_nr - 1].prefix_len;
if (iter->flags & DIR_ITERATOR_FOLLOW_SYMLINKS)
err = stat(iter->base.path.buf, &iter->base.st);
else
err = lstat(iter->base.path.buf, &iter->base.st);
saved_errno = errno;
if (err && errno != ENOENT)
warning_errno("failed to stat '%s'", iter->base.path.buf);
errno = saved_errno;
return err;
}
int dir_iterator_advance(struct dir_iterator *dir_iterator)
{
struct dir_iterator_int *iter =
(struct dir_iterator_int *)dir_iterator;
if (S_ISDIR(iter->base.st.st_mode) && push_level(iter)) {
if (errno != ENOENT && iter->flags & DIR_ITERATOR_PEDANTIC)
goto error_out;
if (iter->levels_nr == 0)
goto error_out;
}
/* Loop until we find an entry that we can give back to the caller. */
while (1) {
struct dirent *de;
struct dir_iterator_level *level =
&iter->levels[iter->levels_nr - 1];
strbuf_setlen(&iter->base.path, level->prefix_len);
errno = 0;
de = readdir(level->dir);
if (!de) {
if (errno) {
warning_errno("error reading directory '%s'",
iter->base.path.buf);
if (iter->flags & DIR_ITERATOR_PEDANTIC)
goto error_out;
} else if (pop_level(iter) == 0) {
return dir_iterator_abort(dir_iterator);
}
continue;
}
if (is_dot_or_dotdot(de->d_name))
continue;
if (prepare_next_entry_data(iter, de)) {
if (errno != ENOENT && iter->flags & DIR_ITERATOR_PEDANTIC)
goto error_out;
continue;
}
return ITER_OK;
}
error_out:
dir_iterator_abort(dir_iterator);
return ITER_ERROR;
}
int dir_iterator_abort(struct dir_iterator *dir_iterator)
{
struct dir_iterator_int *iter = (struct dir_iterator_int *)dir_iterator;
for (; iter->levels_nr; iter->levels_nr--) {
struct dir_iterator_level *level =
&iter->levels[iter->levels_nr - 1];
if (level->dir && closedir(level->dir)) {
int saved_errno = errno;
strbuf_setlen(&iter->base.path, level->prefix_len);
errno = saved_errno;
warning_errno("error closing directory '%s'",
iter->base.path.buf);
}
}
free(iter->levels);
strbuf_release(&iter->base.path);
free(iter);
return ITER_DONE;
}
struct dir_iterator *dir_iterator_begin(const char *path, unsigned int flags)
{
struct dir_iterator_int *iter = xcalloc(1, sizeof(*iter));
struct dir_iterator *dir_iterator = &iter->base;
int saved_errno;
strbuf_init(&iter->base.path, PATH_MAX);
strbuf_addstr(&iter->base.path, path);
ALLOC_GROW(iter->levels, 10, iter->levels_alloc);
iter->levels_nr = 0;
iter->flags = flags;
/*
* Note: stat already checks for NULL or empty strings and
* inexistent paths.
*/
if (stat(iter->base.path.buf, &iter->base.st) < 0) {
saved_errno = errno;
goto error_out;
}
if (!S_ISDIR(iter->base.st.st_mode)) {
saved_errno = ENOTDIR;
goto error_out;
}
return dir_iterator;
error_out:
dir_iterator_abort(dir_iterator);
errno = saved_errno;
return NULL;
}