| #include "git-compat-util.h" |
| #include "alloc.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; |
| |
| 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, err; |
| |
| 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: lstat already checks for NULL or empty strings and |
| * nonexistent paths. |
| */ |
| err = lstat(iter->base.path.buf, &iter->base.st); |
| |
| if (err < 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; |
| } |