#ifndef DIR_ITERATOR_H
#define DIR_ITERATOR_H
+#include "strbuf.h"
+
/*
* Iterate over a directory tree.
*
* Iterate over a directory tree, recursively, including paths of all
* types and hidden paths. Skip "." and ".." entries and don't follow
- * symlinks except for the original path.
+ * symlinks except for the original path. Note that the original path
+ * is not included in the iteration.
*
* Every time dir_iterator_advance() is called, update the members of
* the dir_iterator structure to reflect the next path in the
* iteration. The order that paths are iterated over within a
- * directory is undefined, but directory paths are always iterated
- * over before the subdirectory contents.
+ * directory is undefined, directory paths are always given before
+ * their contents.
*
* A typical iteration looks like this:
*
* int ok;
- * struct iterator *iter = dir_iterator_begin(path);
+ * unsigned int flags = DIR_ITERATOR_PEDANTIC;
+ * struct dir_iterator *iter = dir_iterator_begin(path, flags);
+ *
+ * if (!iter)
+ * goto error_handler;
*
* while ((ok = dir_iterator_advance(iter)) == ITER_OK) {
* if (want_to_stop_iteration()) {
* dir_iterator_advance() again.
*/
+/*
+ * Flags for dir_iterator_begin:
+ *
+ * - DIR_ITERATOR_PEDANTIC: override dir-iterator's default behavior
+ * in case of an error at dir_iterator_advance(), which is to keep
+ * looking for a next valid entry. With this flag, resources are freed
+ * and ITER_ERROR is returned immediately. In both cases, a meaningful
+ * warning is emitted. Note: ENOENT errors are always ignored so that
+ * the API users may remove files during iteration.
+ *
+ * - DIR_ITERATOR_FOLLOW_SYMLINKS: make dir-iterator follow symlinks.
+ * i.e., linked directories' contents will be iterated over and
+ * iter->base.st will contain information on the referred files,
+ * not the symlinks themselves, which is the default behavior. Broken
+ * symlinks are ignored.
+ *
+ * Warning: circular symlinks are also followed when
+ * DIR_ITERATOR_FOLLOW_SYMLINKS is set. The iteration may end up with
+ * an ELOOP if they happen and DIR_ITERATOR_PEDANTIC is set.
+ */
+#define DIR_ITERATOR_PEDANTIC (1 << 0)
+#define DIR_ITERATOR_FOLLOW_SYMLINKS (1 << 1)
+
struct dir_iterator {
/* The current path: */
struct strbuf path;
/* The current basename: */
const char *basename;
- /* The result of calling lstat() on path: */
+ /*
+ * The result of calling lstat() on path; or stat(), if the
+ * DIR_ITERATOR_FOLLOW_SYMLINKS flag was set at
+ * dir_iterator's initialization.
+ */
struct stat st;
};
/*
- * Start a directory iteration over path. Return a dir_iterator that
- * holds the internal state of the iteration.
+ * Start a directory iteration over path with the combination of
+ * options specified by flags. On success, return a dir_iterator
+ * that holds the internal state of the iteration. In case of
+ * failure, return NULL and set errno accordingly.
*
* The iteration includes all paths under path, not including path
* itself and not including "." or ".." entries.
*
- * path is the starting directory. An internal copy will be made.
+ * Parameters are:
+ * - path is the starting directory. An internal copy will be made.
+ * - flags is a combination of the possible flags to initialize a
+ * dir-iterator or 0 for default behavior.
*/
-struct dir_iterator *dir_iterator_begin(const char *path);
+struct dir_iterator *dir_iterator_begin(const char *path, unsigned int flags);
/*
* Advance the iterator to the first or next item and return ITER_OK.
* If the iteration is exhausted, free the dir_iterator and any
- * resources associated with it and return ITER_DONE. On error, free
- * dir_iterator and associated resources and return ITER_ERROR. It is
- * a bug to use iterator or call this function again after it has
- * returned ITER_DONE or ITER_ERROR.
+ * resources associated with it and return ITER_DONE.
+ *
+ * It is a bug to use iterator or call this function again after it
+ * has returned ITER_DONE or ITER_ERROR (which may be returned iff
+ * the DIR_ITERATOR_PEDANTIC flag was set).
*/
int dir_iterator_advance(struct dir_iterator *iterator);