Adding upstream version 2.36.1.upstream/2.36.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 152 insertions, 0 deletions

diff --git a/libsmartcols/src/walk.c b/libsmartcols/src/walk.c
new file mode 100644
index 0000000..a75fde6
--- /dev/null
+++ b/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;
+}