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-rw-r--r--utils/libsmartcols/src/walk.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/utils/libsmartcols/src/walk.c b/utils/libsmartcols/src/walk.c
new file mode 100644
index 0000000..a75fde6
--- /dev/null
+++ b/utils/libsmartcols/src/walk.c
@@ -0,0 +1,152 @@
+#include "smartcolsP.h"
+
+static int walk_line(struct libscols_table *tb,
+ struct libscols_line *ln,
+ struct libscols_column *cl,
+ int (*callback)(struct libscols_table *,
+ struct libscols_line *,
+ struct libscols_column *,
+ void *),
+ void *data)
+{
+ int rc = 0;
+
+ DBG(LINE, ul_debugobj(ln, " wall line"));
+
+ /* we list group children in __scols_print_tree() after tree root node */
+ if (is_group_member(ln) && is_last_group_member(ln) && has_group_children(ln))
+ tb->ngrpchlds_pending++;
+
+ if (has_groups(tb))
+ rc = scols_groups_update_grpset(tb, ln);
+ if (rc == 0)
+ rc = callback(tb, ln, cl, data);
+
+ /* children */
+ if (rc == 0 && has_children(ln)) {
+ struct list_head *p;
+
+ DBG(LINE, ul_debugobj(ln, " children walk"));
+
+ list_for_each(p, &ln->ln_branch) {
+ struct libscols_line *chld = list_entry(p,
+ struct libscols_line, ln_children);
+
+ rc = walk_line(tb, chld, cl, callback, data);
+ if (rc)
+ break;
+ }
+ }
+
+ DBG(LINE, ul_debugobj(ln, "<- walk line done [rc=%d]", rc));
+ return rc;
+}
+
+/* last line in the tree? */
+int scols_walk_is_last(struct libscols_table *tb, struct libscols_line *ln)
+{
+ if (tb->walk_last_done == 0)
+ return 0;
+ if (tb->ngrpchlds_pending > 0)
+ return 0;
+ if (has_children(ln))
+ return 0;
+ if (is_tree_root(ln) && !is_last_tree_root(tb, ln))
+ return 0;
+ if (is_group_member(ln) && (!is_last_group_member(ln) || has_group_children(ln)))
+ return 0;
+ if (is_child(ln)) {
+ struct libscols_line *parent = ln->parent;
+
+ if (!is_last_child(ln))
+ return 0;
+ while (parent) {
+ if (is_child(parent) && !is_last_child(parent))
+ return 0;
+ if (!parent->parent)
+ break;
+ parent = parent->parent;
+ }
+ if (is_tree_root(parent) && !is_last_tree_root(tb, parent))
+ return 0;
+ }
+ if (is_group_child(ln) && !is_last_group_child(ln))
+ return 0;
+
+ DBG(LINE, ul_debugobj(ln, "last in table"));
+ return 1;
+}
+
+int scols_walk_tree(struct libscols_table *tb,
+ struct libscols_column *cl,
+ int (*callback)(struct libscols_table *,
+ struct libscols_line *,
+ struct libscols_column *,
+ void *),
+ void *data)
+{
+ int rc = 0;
+ struct libscols_line *ln;
+ struct libscols_iter itr;
+
+ assert(tb);
+ DBG(TAB, ul_debugobj(tb, ">> walk start"));
+
+ /* init */
+ tb->ngrpchlds_pending = 0;
+ tb->walk_last_tree_root = NULL;
+ tb->walk_last_done = 0;
+
+ if (has_groups(tb))
+ scols_groups_reset_state(tb);
+
+ /* set pointer to last tree root */
+ scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+ while (scols_table_next_line(tb, &itr, &ln) == 0) {
+ if (!tb->walk_last_tree_root)
+ tb->walk_last_tree_root = ln;
+ if (is_child(ln) || is_group_child(ln))
+ continue;
+ tb->walk_last_tree_root = ln;
+ }
+
+ /* walk */
+ scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+ while (rc == 0 && scols_table_next_line(tb, &itr, &ln) == 0) {
+ if (ln->parent || ln->parent_group)
+ continue;
+
+ if (tb->walk_last_tree_root == ln)
+ tb->walk_last_done = 1;
+ rc = walk_line(tb, ln, cl, callback, data);
+
+ /* walk group's children */
+ while (rc == 0 && tb->ngrpchlds_pending) {
+ struct libscols_group *gr = scols_grpset_get_printable_children(tb);
+ struct list_head *p;
+
+ DBG(LINE, ul_debugobj(ln, " walk group children [pending=%zu]", tb->ngrpchlds_pending));
+ if (!gr) {
+ DBG(LINE, ul_debugobj(ln, " *** ngrpchlds_pending counter invalid"));
+ tb->ngrpchlds_pending = 0;
+ break;
+ }
+
+ tb->ngrpchlds_pending--;
+
+ list_for_each(p, &gr->gr_children) {
+ struct libscols_line *chld =
+ list_entry(p, struct libscols_line, ln_children);
+
+ rc = walk_line(tb, chld, cl, callback, data);
+ if (rc)
+ break;
+ }
+ }
+ }
+
+ tb->ngrpchlds_pending = 0;
+ tb->walk_last_done = 0;
+ DBG(TAB, ul_debugobj(tb, "<< walk end [rc=%d]", rc));
+ return rc;
+}