Adding upstream version 2.39.3.upstream/2.39.3

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

17 files changed, 7715 insertions, 0 deletions

diff --git a/libsmartcols/src/Makemodule.am b/libsmartcols/src/Makemodule.am
new file mode 100644
index 0000000..2bb19fd
--- /dev/null
+++ b/libsmartcols/src/Makemodule.am
@@ -0,0 +1,62 @@
+
+
+# smartcols.h is generated, so it's stored in builddir!
+smartcolsincdir = $(includedir)/libsmartcols
+nodist_smartcolsinc_HEADERS = libsmartcols/src/libsmartcols.h
+
+usrlib_exec_LTLIBRARIES += libsmartcols.la
+libsmartcols_la_SOURCES= \
+	include/list.h \
+	\
+	libsmartcols/src/smartcolsP.h \
+	libsmartcols/src/iter.c \
+	libsmartcols/src/symbols.c \
+	libsmartcols/src/cell.c \
+	libsmartcols/src/column.c \
+	libsmartcols/src/line.c \
+	libsmartcols/src/table.c \
+	libsmartcols/src/print.c \
+	libsmartcols/src/print-api.c \
+	libsmartcols/src/version.c \
+	libsmartcols/src/calculate.c \
+	libsmartcols/src/grouping.c \
+	libsmartcols/src/walk.c \
+	libsmartcols/src/init.c
+
+libsmartcols_la_LIBADD = $(LDADD) libcommon.la
+
+libsmartcols_la_CFLAGS = \
+	$(AM_CFLAGS) \
+	$(SOLIB_CFLAGS) \
+	-I$(ul_libsmartcols_incdir) \
+	-I$(top_srcdir)/libsmartcols/src
+
+EXTRA_libsmartcols_la_DEPENDENCIES = \
+	libsmartcols/src/libsmartcols.sym
+
+libsmartcols_la_LDFLAGS = $(SOLIB_LDFLAGS)
+if HAVE_VSCRIPT
+libsmartcols_la_LDFLAGS += $(VSCRIPT_LDFLAGS),$(top_srcdir)/libsmartcols/src/libsmartcols.sym
+endif
+libsmartcols_la_LDFLAGS += -version-info $(LIBSMARTCOLS_VERSION_INFO)
+
+EXTRA_DIST += \
+	libsmartcols/src/libsmartcols.sym
+
+# move lib from $(usrlib_execdir) to $(libdir) if needed
+install-exec-hook-libsmartcols:
+	if test "$(usrlib_execdir)" != "$(libdir)" -a -f "$(DESTDIR)$(usrlib_execdir)/libsmartcols.so"; then \
+		$(MKDIR_P) $(DESTDIR)$(libdir); \
+		mv $(DESTDIR)$(usrlib_execdir)/libsmartcols.so.* $(DESTDIR)$(libdir); \
+		so_img_name=$$(readlink $(DESTDIR)$(usrlib_execdir)/libsmartcols.so); \
+		so_img_rel_target=$$(echo $(usrlib_execdir) | sed 's,\(^/\|\)[^/][^/]*,..,g'); \
+		(cd $(DESTDIR)$(usrlib_execdir) && \
+			rm -f libsmartcols.so && \
+			$(LN_S) $$so_img_rel_target$(libdir)/$$so_img_name libsmartcols.so); \
+	fi
+
+uninstall-hook-libsmartcols:
+	rm -f $(DESTDIR)$(libdir)/libsmartcols.so*
+
+INSTALL_EXEC_HOOKS += install-exec-hook-libsmartcols
+UNINSTALL_HOOKS += uninstall-hook-libsmartcols
diff --git a/libsmartcols/src/calculate.c b/libsmartcols/src/calculate.c
new file mode 100644
index 0000000..ad0b15d
--- /dev/null
+++ b/libsmartcols/src/calculate.c
@@ -0,0 +1,608 @@
+#include "smartcolsP.h"
+#include "mbsalign.h"
+
+static void dbg_column(struct libscols_table *tb, struct libscols_column *cl)
+{
+	struct libscols_wstat *st;
+
+	if (scols_column_is_hidden(cl)) {
+		DBG(COL, ul_debugobj(cl, "%s (hidden) ignored", cl->header.data));
+		return;
+	}
+
+	st = &cl->wstat;
+
+	DBG(COL, ul_debugobj(cl, "%15s seq=%zu, width=%zd, "
+				 "hint=%d, max=%zu, min=%zu, "
+				 "0x04%x [%s%s%s]",
+
+		cl->header.data, cl->seqnum, cl->width,
+		cl->width_hint >= 1.0 ? (int) cl->width_hint :
+				     (int) (cl->width_hint * tb->termwidth),
+		st->width_max,
+		st->width_min,
+		cl->flags,
+		cl->flags & SCOLS_FL_TRUNC ? "trunc" : "",
+		scols_column_is_right(cl) ? " right" : "",
+		scols_column_is_noextremes(cl) ? " noextrem" : ""));
+}
+
+static void dbg_columns(struct libscols_table *tb)
+{
+	struct libscols_iter itr;
+	struct libscols_column *cl;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0)
+		dbg_column(tb, cl);
+}
+
+static int count_cell_width(struct libscols_table *tb,
+		struct libscols_line *ln,
+		struct libscols_column *cl,
+		struct ul_buffer *buf)
+{
+	size_t len;
+	char *data;
+	int rc;
+	struct libscols_cell *ce;
+	struct libscols_wstat *st;
+
+	rc = __cell_to_buffer(tb, ln, cl, buf);
+	if (rc)
+		return rc;
+
+	data = ul_buffer_get_data(buf, NULL, NULL);
+	if (!data)
+		len = 0;
+	else if (scols_column_is_customwrap(cl))
+		len = cl->wrap_chunksize(cl, data, cl->wrapfunc_data);
+	else if (scols_table_is_noencoding(tb))
+		len = mbs_width(data);
+	else
+		len = mbs_safe_width(data);
+
+	if (len == (size_t) -1)		/* ignore broken multibyte strings */
+		len = 0;
+
+	ce = scols_line_get_cell(ln, cl->seqnum);
+	ce->width = len;
+
+	st = &cl->wstat;
+	st->width_max = max(len, st->width_max);
+
+	if (scols_column_is_tree(cl)) {
+		size_t treewidth = ul_buffer_get_safe_pointer_width(buf, SCOLS_BUFPTR_TREEEND);
+		cl->width_treeart = max(cl->width_treeart, treewidth);
+	}
+
+	return 0;
+}
+
+static int walk_count_cell_width(struct libscols_table *tb,
+		struct libscols_line *ln,
+		struct libscols_column *cl,
+		void *data)
+{
+	return count_cell_width(tb, ln, cl, (struct ul_buffer *) data);
+}
+
+static double sqrtroot(double num)
+{
+	double tmp = 0, sq = num / 2;
+
+	while (sq != tmp){
+		tmp = sq;
+		sq = (num / tmp + tmp) / 2;
+	}
+	return sq;
+}
+
+static void count_column_deviation(struct libscols_table *tb, struct libscols_column *cl)
+{
+	struct libscols_wstat *st;
+	struct libscols_iter itr;
+	struct libscols_line *ln;
+	struct libscols_cell *ce;
+	size_t sum = 0, n = 0, extra = 0;
+
+	st = &cl->wstat;
+
+	if (scols_column_is_tree(cl) && has_groups(tb))
+		extra = tb->grpset_size + 1;
+
+	/* count average */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_line(tb, &itr, &ln) == 0) {
+		ce = scols_line_get_cell(ln, cl->seqnum);
+
+		n++;
+		sum += ce->width + extra;
+	}
+
+	if (n)
+		st->width_avg = sum / n;
+
+	/* count deviation */
+	if (n > 1) {
+		double variance;
+
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (scols_table_next_line(tb, &itr, &ln) == 0) {
+			double diff;
+			ce = scols_line_get_cell(ln, cl->seqnum);
+
+			diff = (double) ce->width - st->width_avg;
+			st->width_sqr_sum += diff * diff;	/* aka pow(x, 2) */
+		}
+
+		variance = st->width_sqr_sum / (n - 1);
+		st->width_deviation = sqrtroot(variance);
+	}
+
+	DBG(COL, ul_debugobj(cl, "%15s avg=%g, deviation=%g",
+				cl->header.data,
+				st->width_avg,
+				st->width_deviation));
+}
+
+/*
+ * This function counts column width.
+ */
+static int count_column_width(struct libscols_table *tb,
+			      struct libscols_column *cl,
+			      struct ul_buffer *buf)
+{
+	int rc = 0, no_header = 0;
+	const char *data;
+	struct libscols_wstat *st;
+	struct libscols_iter itr;
+	struct libscols_line *ln;
+
+	assert(tb);
+	assert(cl);
+
+	st = &cl->wstat;
+
+	cl->width = 0;
+	memset(st, 0, sizeof(struct libscols_wstat));
+
+	/* set minimal width according to width_hint */
+	if (cl->width_hint < 1 && scols_table_is_maxout(tb) && tb->is_term) {
+		st->width_min = (size_t) (cl->width_hint * tb->termwidth);
+		if (st->width_min && !is_last_column(cl))
+			st->width_min--;
+	}
+
+	/* set minimal width according to header width */
+	data = scols_cell_get_data(&cl->header);
+	if (data) {
+		size_t len = scols_table_is_noencoding(tb) ?
+				mbs_width(data) : mbs_safe_width(data);
+
+		st->width_min = max(st->width_min, len);
+	} else
+		no_header = 1;
+
+	if (!st->width_min)
+		st->width_min = 1;
+
+	/* count width according to cells data */
+	if (scols_table_is_tree(tb)) {
+		/* Count width for tree */
+		rc = scols_walk_tree(tb, cl, walk_count_cell_width, (void *) buf);
+		if (rc)
+			goto done;
+	} else {
+		/* Count width for list */
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (scols_table_next_line(tb, &itr, &ln) == 0) {
+			rc = count_cell_width(tb, ln, cl, buf);
+			if (rc)
+				goto done;
+		}
+	}
+
+	if (scols_column_is_tree(cl) && has_groups(tb)) {
+		/* We don't fill buffer with groups tree ascii art during width
+		 * calculation. The print function only enlarge grpset[] and we
+		 * calculate final width from grpset_size.
+		 */
+		size_t gprwidth = tb->grpset_size + 1;
+		st->width_treeart += gprwidth;
+		st->width_max += gprwidth;
+	}
+
+	/* this is default, may be later reduced */
+	cl->width = st->width_max;
+
+	/* enlarge to minimal width */
+	if (cl->width < st->width_min && !scols_column_is_strict_width(cl))
+		cl->width = st->width_min;
+
+	/* use absolute size for large columns */
+	else if (cl->width_hint >= 1 && cl->width < (size_t) cl->width_hint
+		 && st->width_min < (size_t) cl->width_hint)
+
+		cl->width = (size_t) cl->width_hint;
+
+
+	/* Column without header and data, set minimal size to zero (default is 1) */
+	if (st->width_max == 0 && no_header && st->width_min == 1 && cl->width <= 1)
+		cl->width = st->width_min = 0;
+
+done:
+	ON_DBG(COL, dbg_column(tb, cl));
+	return rc;
+}
+
+static int cmp_deviation(struct list_head *a, struct list_head *b,
+			 void *data __attribute__((__unused__)))
+{
+	struct libscols_column *ca = list_entry(a, struct libscols_column, cl_columns);
+	struct libscols_column *cb = list_entry(b, struct libscols_column, cl_columns);
+
+	double xa = ca->wstat.width_avg + (3*ca->wstat.width_deviation);
+	double xb = cb->wstat.width_avg + (3*cb->wstat.width_deviation);
+
+	return cmp_numbers(xa, xb);
+}
+
+static int cmp_seqnum(struct list_head *a, struct list_head *b,
+			void *data __attribute__((__unused__)))
+{
+	struct libscols_column *ca = list_entry(a, struct libscols_column, cl_columns);
+	struct libscols_column *cb = list_entry(b, struct libscols_column, cl_columns);
+
+	return cmp_numbers(ca->seqnum, cb->seqnum);
+}
+
+static inline void sort_columns(struct libscols_table *tb,
+			int (*cmp)(struct list_head *, struct list_head *, void *))
+{
+	list_sort(&tb->tb_columns, cmp, NULL);
+}
+
+
+/* 68%–95%–99% rule (aka empirical rule) defines relation ship between
+ * mean (avg) and and standard deviation.
+ *
+ *	avg + (n * deviation)
+ *
+ * n=1	: covers 68% of data
+ * n=2  : covers 95% of data
+ * n=3  : covers 99.7% of data
+ *
+ */
+static void reduce_to_68(struct libscols_column *cl, size_t wanted)
+{
+	struct libscols_wstat *st = &cl->wstat;
+	size_t new;
+
+	if (st->width_deviation < 1.0)
+		return;
+
+	new = st->width_avg + st->width_deviation;
+	if (new < st->width_min)
+		new = st->width_min;
+
+	if (cl->width - new > wanted)
+		cl->width -= wanted;
+	else
+		cl->width = new;
+}
+
+static int reduce_column(struct libscols_table *tb,
+			 struct libscols_column *cl,
+			 size_t *width,
+			 int stage,
+			 int nth)
+{
+	struct libscols_wstat *st = &cl->wstat;
+	size_t wanted, org_width, reduce = 1;
+	int is_trunc = 0;
+
+	if (tb->termwidth >= *width)
+		return 1;
+	/* ignore hidden columns */
+	if (scols_column_is_hidden(cl))
+		return 0;
+	/* never truncate if already minimal width */
+	if (cl->width == cl->wstat.width_min)
+		return 0;
+	/* nothing to truncate */
+	if (cl->width == 0)
+		return 0;
+	/* never truncate the tree */
+	if (scols_column_is_tree(cl) && *width <= cl->width_treeart)
+		return 0;
+
+	org_width = cl->width;
+	wanted = *width - tb->termwidth;
+
+	is_trunc = scols_column_is_trunc(cl)
+			|| (scols_column_is_wrap(cl) && !scols_column_is_customwrap(cl));
+
+	switch (stage) {
+	case 0:
+		/* reduce 1st column if with trunc or extreme flag (the
+		 * columns are sorted by deviation, so 1st is the worst) */
+		if (!is_trunc && !scols_column_is_noextremes(cl))
+			break;
+		if (nth != 0)
+			break;
+		reduce_to_68(cl, wanted);
+		break;
+
+	case 1:
+		/* reduce extreme columns with large width deviation */
+		if (st->width_deviation < st->width_avg / 2.0)
+			break;
+		/* fallthrough */
+	case 2:
+		/* reduce extreme columns */
+		if (!scols_column_is_noextremes(cl))
+			break;
+		reduce_to_68(cl, wanted);
+		break;
+
+	case 3:
+		/* reduce columns with trunc flag and relative whint and large width deviation */
+		if (st->width_deviation < st->width_avg / 2.0)
+			break;
+		/* fallthrough */
+	case 4:
+		/* reduce columns with trunc flag and relative whint */
+		if (!is_trunc)
+			break;
+		if (cl->width_hint <= 0 || cl->width_hint >= 1)
+			break;
+		if (cl->width < (size_t) (cl->width_hint * tb->termwidth))
+			break;
+		reduce_to_68(cl, wanted);
+		break;
+
+	case 5:
+		/* reduce all columns with trunc flag large width deviation */
+		if (st->width_deviation < st->width_avg / 2.2)
+			break;
+		/* fallthrough */
+	case 6:
+		/* reduce all columns with trunc flag */
+		if (!is_trunc && !scols_column_is_noextremes(cl))
+			break;
+		if (nth == 0)
+			/* columns are reduced in "bad first" way, be more
+			 * agresive for the the worst column */
+			reduce = 3;
+		if (cl->width - reduce < st->width_min)
+			reduce = cl->width - st->width_min;
+		cl->width -= reduce;
+		break;
+	default:
+		return -1;	/* no more stages */
+	}
+
+	/* hide zero width columns */
+	if (cl->width == 0)
+		cl->flags |= SCOLS_FL_HIDDEN;
+
+	if (cl->width != org_width)
+		DBG(COL, ul_debugobj(cl, " [%02zd] %s reduced %zu-->%zu",
+					cl->seqnum,
+					cl->header.data, org_width, cl->width));
+
+	*width -= org_width - cl->width;
+	return 0;
+}
+
+/*
+ * This is core of the scols_* voodoo...
+ */
+int __scols_calculate(struct libscols_table *tb, struct ul_buffer *buf)
+{
+	struct libscols_column *cl, *last_cl;
+	struct libscols_iter itr;
+	size_t width = 0, width_min = 0;	/* output width */
+	int stage = 0, rc = 0;
+	int ignore_extremes = 0, group_ncolumns = 0;
+	size_t colsepsz;
+	int sorted = 0;
+
+
+	DBG(TAB, ul_debugobj(tb, "-----calculate-(termwidth=%zu)-----", tb->termwidth));
+	tb->is_dummy_print = 1;
+
+	colsepsz = scols_table_is_noencoding(tb) ?
+			mbs_width(colsep(tb)) :
+			mbs_safe_width(colsep(tb));
+
+	if (has_groups(tb))
+		group_ncolumns = 1;
+
+	/* set basic columns width
+	 */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0) {
+		int is_last;
+
+		if (scols_column_is_hidden(cl))
+			continue;
+
+		/* we print groups chart only for the for the first tree column */
+		if (scols_column_is_tree(cl) && group_ncolumns == 1) {
+			cl->is_groups = 1;
+			group_ncolumns++;
+		}
+
+		rc = count_column_width(tb, cl, buf);
+		if (rc)
+			goto done;
+
+		is_last = is_last_column(cl);
+
+		width += cl->width + (is_last ? 0 : colsepsz);		/* separator for non-last column */
+		width_min += cl->wstat.width_min + (is_last ? 0 : colsepsz);
+	}
+
+	if (!tb->is_term) {
+		DBG(TAB, ul_debugobj(tb, " non-terminal output"));
+		goto done;
+	}
+
+	/* be paranoid */
+	if (width_min > tb->termwidth && scols_table_is_maxout(tb)) {
+		DBG(TAB, ul_debugobj(tb, " min width larger than terminal! [width=%zu, term=%zu]", width_min, tb->termwidth));
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (width_min > tb->termwidth
+		       && scols_table_next_column(tb, &itr, &cl) == 0) {
+
+			if (scols_column_is_hidden(cl))
+				continue;
+			width_min--;
+			cl->wstat.width_min--;
+		}
+		DBG(TAB, ul_debugobj(tb, " min width reduced to %zu", width_min));
+	}
+
+	/* calculate statistics */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0) {
+
+		count_column_deviation(tb, cl);
+
+		if (scols_column_is_noextremes(cl))
+			ignore_extremes++;
+	}
+
+	/* remember last column before we sort columns */
+	last_cl = list_entry(tb->tb_columns.prev, struct libscols_column, cl_columns);
+
+	/* reduce columns width */
+	while (width > tb->termwidth) {
+		size_t org_width = width;
+		int rc = 0, n = 0;
+
+		if (!sorted) {
+			DBG(TAB, ul_debugobj(tb, "sorting by deviation"));
+			sort_columns(tb, cmp_deviation);
+			ON_DBG(TAB, dbg_columns(tb));
+			sorted = 1;
+		}
+
+		DBG(TAB, ul_debugobj(tb, "#%d reduce stage (width=%zu, term=%zu)",
+			stage, width, tb->termwidth));
+
+		scols_reset_iter(&itr, SCOLS_ITER_BACKWARD);
+
+		while (width > tb->termwidth
+		       && rc == 0
+		       && scols_table_next_column(tb, &itr, &cl) == 0) {
+			rc = reduce_column(tb, cl, &width, stage, n++);
+		}
+
+		if (rc != 0)
+			break;
+		if (org_width == width)
+			stage++;
+	}
+
+	/* enlarge */
+	if (width < tb->termwidth) {
+		if (ignore_extremes) {
+			if (!sorted) {
+				sort_columns(tb, cmp_deviation);
+				sorted = 1;
+			}
+
+			scols_reset_iter(&itr, SCOLS_ITER_BACKWARD);
+			while (scols_table_next_column(tb, &itr, &cl) == 0) {
+				size_t add;
+
+				if (!scols_column_is_noextremes(cl) || scols_column_is_hidden(cl))
+					continue;
+				if (cl->wstat.width_min == 0 && cl->width == 0)
+					continue;
+
+				add = tb->termwidth - width;
+				if (add && cl->wstat.width_max &&
+				    cl->width + add > cl->wstat.width_max)
+					add = cl->wstat.width_max - cl->width;
+				if (!add)
+					continue;
+				DBG(TAB, ul_debugobj(tb, " add +%zd (extreme %s)",
+							add, cl->header.data));
+				cl->width += add;
+				width += add;
+
+				if (width == tb->termwidth)
+					break;
+			}
+		}
+
+		if (width < tb->termwidth && scols_table_is_maxout(tb)) {
+			DBG(TAB, ul_debugobj(tb, " enlarge width (max-out)"));
+
+			/* try enlarging all columns */
+			while (width < tb->termwidth) {
+				scols_reset_iter(&itr, SCOLS_ITER_BACKWARD);
+				while (scols_table_next_column(tb, &itr, &cl) == 0) {
+					if (scols_column_is_hidden(cl))
+						continue;
+					DBG(TAB, ul_debugobj(tb, " enlarge (max-out %s)",
+								cl->header.data));
+					cl->width++;
+					width++;
+					if (width == tb->termwidth)
+						break;
+				}
+			}
+		} else if (width < tb->termwidth) {
+			/* enlarge the last column */
+			DBG(TAB, ul_debugobj(tb, " enlarge width (last column)"));
+
+			if (!scols_column_is_right(last_cl)) {
+				last_cl->width += tb->termwidth - width;
+				width = tb->termwidth;
+			}
+		}
+	}
+
+
+	if (sorted) {
+		sort_columns(tb, cmp_seqnum);
+		sorted = 0;
+	}
+
+	/* ignore last column(s) or force last column to be truncated if
+	 * nowrap mode enabled */
+	if (tb->no_wrap && width > tb->termwidth) {
+		scols_reset_iter(&itr, SCOLS_ITER_BACKWARD);
+		while (scols_table_next_column(tb, &itr, &cl) == 0) {
+
+			if (scols_column_is_hidden(cl))
+				continue;
+			if (width <= tb->termwidth)
+				break;
+			if (width - cl->width < tb->termwidth) {
+				size_t r =  width - tb->termwidth;
+
+				cl->flags |= SCOLS_FL_TRUNC;
+				cl->width -= r;
+				width -= r;
+			} else {
+				cl->flags |= SCOLS_FL_HIDDEN;
+				width -= cl->width + colsepsz;
+			}
+		}
+	}
+done:
+	if (sorted)
+		sort_columns(tb, cmp_seqnum);
+
+	tb->is_dummy_print = 0;
+	DBG(TAB, ul_debugobj(tb, "-----final width: %zu (rc=%d)-----", width, rc));
+	ON_DBG(TAB, dbg_columns(tb));
+
+	return rc;
+}
diff --git a/libsmartcols/src/cell.c b/libsmartcols/src/cell.c
new file mode 100644
index 0000000..5b83123
--- /dev/null
+++ b/libsmartcols/src/cell.c
@@ -0,0 +1,260 @@
+/*
+ * cell.c - functions for table handling at the cell level
+ *
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * SECTION: cell
+ * @title: Cell
+ * @short_description: container for your data
+ *
+ * An API to access and modify per-cell data and information. Note that cell is
+ * always part of the line. If you destroy (un-reference) a line than it
+ * destroys all line cells too.
+ */
+
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "smartcolsP.h"
+
+/*
+ * The cell has no ref-counting, free() and new() functions. All is
+ * handled by libscols_line.
+ */
+
+/**
+ * scols_reset_cell:
+ * @ce: pointer to a struct libscols_cell instance
+ *
+ * Frees the cell's internal data and resets its status.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_reset_cell(struct libscols_cell *ce)
+{
+	if (!ce)
+		return -EINVAL;
+
+	/*DBG(CELL, ul_debugobj(ce, "reset"));*/
+	free(ce->data);
+	free(ce->color);
+	memset(ce, 0, sizeof(*ce));
+	return 0;
+}
+
+/**
+ * scols_cell_set_data:
+ * @ce: a pointer to a struct libscols_cell instance
+ * @data: data (used for scols_print_table())
+ *
+ * Stores a copy of the @str in @ce, the old data are deallocated by free().
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_cell_set_data(struct libscols_cell *ce, const char *data)
+{
+	return strdup_to_struct_member(ce, data, data);
+}
+
+/**
+ * scols_cell_refer_data:
+ * @ce: a pointer to a struct libscols_cell instance
+ * @data: data (used for scols_print_table())
+ *
+ * Adds a reference to @str to @ce. The pointer is deallocated by
+ * scols_reset_cell() or scols_unref_line(). This function is mostly designed
+ * for situations when the data for the cell are already composed in allocated
+ * memory (e.g. asprintf()) to avoid extra unnecessary strdup().
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_cell_refer_data(struct libscols_cell *ce, char *data)
+{
+	if (!ce)
+		return -EINVAL;
+	free(ce->data);
+	ce->data = data;
+	return 0;
+}
+
+/**
+ * scols_cell_get_data:
+ * @ce: a pointer to a struct libscols_cell instance
+ *
+ * Returns: data in @ce or NULL.
+ */
+const char *scols_cell_get_data(const struct libscols_cell *ce)
+{
+	return ce ? ce->data : NULL;
+}
+
+/**
+ * scols_cell_set_userdata:
+ * @ce: a pointer to a struct libscols_cell instance
+ * @data: private user data
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_cell_set_userdata(struct libscols_cell *ce, void *data)
+{
+	if (!ce)
+		return -EINVAL;
+	ce->userdata = data;
+	return 0;
+}
+
+/**
+ * scols_cell_get_userdata
+ * @ce: a pointer to a struct libscols_cell instance
+ *
+ * Returns: user data
+ */
+void *scols_cell_get_userdata(struct libscols_cell *ce)
+{
+	return ce->userdata;
+}
+
+/**
+ * scols_cmpstr_cells:
+ * @a: pointer to cell
+ * @b: pointer to cell
+ * @data: unused pointer to private data (defined by API)
+ *
+ * Compares cells data by strcoll(). The function is designed for
+ * scols_column_set_cmpfunc() and scols_sort_table().
+ *
+ * Returns: follows strcoll() return values.
+ */
+int scols_cmpstr_cells(struct libscols_cell *a,
+		       struct libscols_cell *b,
+		       __attribute__((__unused__)) void *data)
+{
+	const char *adata, *bdata;
+
+	if (a == b)
+		return 0;
+
+	adata = scols_cell_get_data(a);
+	bdata = scols_cell_get_data(b);
+
+	if (adata == NULL && bdata == NULL)
+		return 0;
+	if (adata == NULL)
+		return -1;
+	if (bdata == NULL)
+		return 1;
+	return strcoll(adata, bdata);
+}
+
+/**
+ * scols_cell_set_color:
+ * @ce: a pointer to a struct libscols_cell instance
+ * @color: color name or ESC sequence
+ *
+ * Set the color of @ce to @color.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_cell_set_color(struct libscols_cell *ce, const char *color)
+{
+	if (color && !color_is_sequence(color)) {
+		char *seq = color_get_sequence(color);
+		if (!seq)
+			return -EINVAL;
+		free(ce->color);
+		ce->color = seq;
+		return 0;
+	}
+	return strdup_to_struct_member(ce, color, color);
+}
+
+/**
+ * scols_cell_get_color:
+ * @ce: a pointer to a struct libscols_cell instance
+ *
+ * Returns: the current color of @ce.
+ */
+const char *scols_cell_get_color(const struct libscols_cell *ce)
+{
+	return ce->color;
+}
+
+/**
+ * scols_cell_set_flags:
+ * @ce: a pointer to a struct libscols_cell instance
+ * @flags: SCOLS_CELL_FL_* flags
+ *
+ * Note that cells in the table are always aligned by column flags. The cell
+ * flags are used for table title only (now).
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_cell_set_flags(struct libscols_cell *ce, int flags)
+{
+	if (!ce)
+		return -EINVAL;
+	ce->flags = flags;
+	return 0;
+}
+
+/**
+ * scols_cell_get_flags:
+ * @ce: a pointer to a struct libscols_cell instance
+ *
+ * Returns: the current flags
+ */
+int scols_cell_get_flags(const struct libscols_cell *ce)
+{
+	return ce->flags;
+}
+
+/**
+ * scols_cell_get_alignment:
+ * @ce: a pointer to a struct libscols_cell instance
+ *
+ * Since: 2.30
+ *
+ * Returns: SCOLS_CELL_FL_{RIGHT,CELNTER,LEFT}
+ */
+int scols_cell_get_alignment(const struct libscols_cell *ce)
+{
+	if (ce->flags & SCOLS_CELL_FL_RIGHT)
+		return SCOLS_CELL_FL_RIGHT;
+	if (ce->flags & SCOLS_CELL_FL_CENTER)
+		return SCOLS_CELL_FL_CENTER;
+
+	return SCOLS_CELL_FL_LEFT;	/* default */
+}
+
+/**
+ * scols_cell_copy_content:
+ * @dest: a pointer to a struct libscols_cell instance
+ * @src: a pointer to an immutable struct libscols_cell instance
+ *
+ * Copy the contents of @src into @dest.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_cell_copy_content(struct libscols_cell *dest,
+			    const struct libscols_cell *src)
+{
+	int rc;
+
+	rc = scols_cell_set_data(dest, scols_cell_get_data(src));
+	if (!rc)
+		rc = scols_cell_set_color(dest, scols_cell_get_color(src));
+	if (!rc)
+		dest->userdata = src->userdata;
+
+	DBG(CELL, ul_debugobj(src, "copy"));
+	return rc;
+}
diff --git a/libsmartcols/src/column.c b/libsmartcols/src/column.c
new file mode 100644
index 0000000..db4c357
--- /dev/null
+++ b/libsmartcols/src/column.c
@@ -0,0 +1,737 @@
+/*
+ * column.c - functions for table handling at the column level
+ *
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * SECTION: column
+ * @title: Column
+ * @short_description: defines output columns formats, headers, etc.
+ *
+ * An API to access and modify per-column data and information.
+ */
+
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "mbsalign.h"
+#include "strutils.h"
+#include "smartcolsP.h"
+
+/**
+ * scols_new_column:
+ *
+ * Allocates space for a new column.
+ *
+ * Returns: a pointer to a new struct libscols_column instance, NULL in case of an ENOMEM error.
+ */
+struct libscols_column *scols_new_column(void)
+{
+	struct libscols_column *cl;
+
+	cl = calloc(1, sizeof(*cl));
+	if (!cl)
+		return NULL;
+	DBG(COL, ul_debugobj(cl, "alloc"));
+	cl->refcount = 1;
+	INIT_LIST_HEAD(&cl->cl_columns);
+	return cl;
+}
+
+/**
+ * scols_ref_column:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Increases the refcount of @cl.
+ */
+void scols_ref_column(struct libscols_column *cl)
+{
+	if (cl)
+		cl->refcount++;
+}
+
+/**
+ * scols_unref_column:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Decreases the refcount of @cl. When the count falls to zero, the instance
+ * is automatically deallocated.
+ */
+void scols_unref_column(struct libscols_column *cl)
+{
+	if (cl && --cl->refcount <= 0) {
+		DBG(COL, ul_debugobj(cl, "dealloc"));
+		list_del(&cl->cl_columns);
+		scols_reset_cell(&cl->header);
+		free(cl->color);
+		free(cl->safechars);
+		free(cl->pending_data_buf);
+		free(cl->shellvar);
+		free(cl);
+	}
+}
+
+/**
+ * scols_copy_column:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Creates a new column and copies @cl's data over to it.
+ *
+ * Returns: a pointer to a new struct libscols_column instance.
+ */
+struct libscols_column *scols_copy_column(const struct libscols_column *cl)
+{
+	struct libscols_column *ret;
+
+	if (!cl)
+		return NULL;
+	ret = scols_new_column();
+	if (!ret)
+		return NULL;
+
+	DBG(COL, ul_debugobj(cl, "copy"));
+
+	if (scols_column_set_color(ret, cl->color))
+		goto err;
+	if (scols_cell_copy_content(&ret->header, &cl->header))
+		goto err;
+
+	ret->width	= cl->width;
+	ret->width_hint	= cl->width_hint;
+	ret->flags	= cl->flags;
+	ret->is_groups  = cl->is_groups;
+
+	memcpy(&ret->wstat, &cl->wstat, sizeof(cl->wstat));
+
+	return ret;
+err:
+	scols_unref_column(ret);
+	return NULL;
+}
+
+/**
+ * scols_column_set_whint:
+ * @cl: a pointer to a struct libscols_column instance
+ * @whint: a width hint
+ *
+ * Sets the width hint of column @cl to @whint. See scols_table_new_column().
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_column_set_whint(struct libscols_column *cl, double whint)
+{
+	if (!cl)
+		return -EINVAL;
+
+	cl->width_hint = whint;
+	return 0;
+}
+
+/**
+ * scols_column_get_whint:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Returns: The width hint of column @cl, a negative value in case of an error.
+ */
+double scols_column_get_whint(const struct libscols_column *cl)
+{
+	return cl->width_hint;
+}
+
+/**
+ * scols_column_set_flags:
+ * @cl: a pointer to a struct libscols_column instance
+ * @flags: a flag mask
+ *
+ * Sets the flags of @cl to @flags.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_column_set_flags(struct libscols_column *cl, int flags)
+{
+	if (!cl)
+		return -EINVAL;
+
+	if (cl->table) {
+		if (!(cl->flags & SCOLS_FL_TREE) && (flags & SCOLS_FL_TREE))
+			cl->table->ntreecols++;
+		else if ((cl->flags & SCOLS_FL_TREE) && !(flags & SCOLS_FL_TREE))
+			cl->table->ntreecols--;
+	}
+
+	DBG(COL, ul_debugobj(cl, "setting flags from 0x%04x to 0x%04x", cl->flags, flags));
+	cl->flags = flags;
+	return 0;
+}
+
+/**
+ * scols_column_set_json_type:
+ * @cl: a pointer to a struct libscols_column instance
+ * @type: SCOLS_JSON_* type
+ *
+ * Sets the type used for JSON formatting, the default is SCOLS_JSON_STRING.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.33
+ */
+int scols_column_set_json_type(struct libscols_column *cl, int type)
+{
+	if (!cl)
+		return -EINVAL;
+
+	cl->json_type = type;
+	return 0;
+
+}
+
+/**
+ * scols_column_get_json_type:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Note that SCOLS_JSON_BOOLEAN interprets NULL, empty strings, '0', 'N' and
+ * 'n' as "false"; and everything else as "true".
+ *
+ * Returns: JSON type used for formatting or a negative value in case of an error.
+ *
+ * Since: 2.33
+ */
+int scols_column_get_json_type(const struct libscols_column *cl)
+{
+	return cl ? cl->json_type : -EINVAL;
+}
+
+
+/**
+ * scols_column_get_table:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Returns: pointer to the table where columns is used
+ */
+struct libscols_table *scols_column_get_table(const struct libscols_column *cl)
+{
+	return cl->table;
+}
+
+/**
+ * scols_column_get_flags:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Returns: The flag mask of @cl, a negative value in case of an error.
+ */
+int scols_column_get_flags(const struct libscols_column *cl)
+{
+	return cl->flags;
+}
+
+/**
+ * scols_column_get_header:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Returns: A pointer to a struct libscols_cell instance, representing the
+ * header info of column @cl or NULL in case of an error.
+ */
+struct libscols_cell *scols_column_get_header(struct libscols_column *cl)
+{
+	return &cl->header;
+}
+
+/**
+ * scols_column_set_name:
+ * @cl: a pointer to a struct libscols_column instance
+ * @name: column name
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.38
+ */
+int scols_column_set_name(struct libscols_column *cl, const char *name)
+{
+	struct libscols_cell *hr = scols_column_get_header(cl);
+
+	if (!hr)
+		return -EINVAL;
+
+	free(cl->shellvar);
+	cl->shellvar = NULL;
+
+	return scols_cell_set_data(hr, name);
+}
+
+/**
+ * scols_column_get_name:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Returns: A pointer to a column name, which is stored in column header
+ *
+ * Since: 2.38
+ */
+const char *scols_column_get_name(struct libscols_column *cl)
+{
+	return scols_cell_get_data(&cl->header);
+}
+
+/**
+ * scols_column_get_name_as_shellvar
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Like scols_column_get_name(), but column name is modified to be compatible with shells
+ * requirements for variable names.
+ *
+ * Since: 2.38
+ */
+const char *scols_column_get_name_as_shellvar(struct libscols_column *cl)
+{
+	if (!cl->shellvar) {
+		const char *s, *name = scols_column_get_name(cl);
+		char *p;
+		size_t sz;
+
+		if (!name || !*name)
+			return NULL;
+
+		/* "1FOO%" --> "_1FOO_PCT */
+		sz = strlen(name) + 1 + 3;
+		p = cl->shellvar = calloc(1, sz + 1);
+		if (!cl->shellvar)
+			return NULL;
+
+		 /* convert "1FOO" to "_1FOO" */
+		if (!isalpha(*name))
+			*p++ = '_';
+
+		/* replace all "bad" chars with "_" */
+		for (s = name; *s; s++)
+			*p++ = !isalnum(*s) ? '_' : *s;
+
+		if (!*s && *(s - 1) == '%') {
+			*p++ = 'P';
+			*p++ = 'C';
+			*p++ = 'T';
+		}
+	}
+	return cl->shellvar;
+}
+
+
+/**
+ * scols_column_set_color:
+ * @cl: a pointer to a struct libscols_column instance
+ * @color: color name or ESC sequence
+ *
+ * The default color for data cells and column header.
+ *
+ * If you want to set header specific color then use scols_column_get_header()
+ * and scols_cell_set_color().
+ *
+ * If you want to set data cell specific color the use scols_line_get_cell() +
+ * scols_cell_set_color().
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_column_set_color(struct libscols_column *cl, const char *color)
+{
+	if (color && !color_is_sequence(color)) {
+		char *seq = color_get_sequence(color);
+		if (!seq)
+			return -EINVAL;
+		free(cl->color);
+		cl->color = seq;
+		return 0;
+	}
+	return strdup_to_struct_member(cl, color, color);
+}
+
+/**
+ * scols_column_get_color:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Returns: The current color setting of the column @cl.
+ */
+const char *scols_column_get_color(const struct libscols_column *cl)
+{
+	return cl->color;
+}
+
+/**
+ * scols_wrapnl_nextchunk:
+ * @cl: a pointer to a struct libscols_column instance
+ * @data: string
+ * @userdata: callback private data
+ *
+ * This is built-in function for scols_column_set_wrapfunc(). This function
+ * terminates the current chunk by \0 and returns pointer to the begin of
+ * the next chunk. The chunks are based on \n.
+ *
+ * For example for data "AAA\nBBB\nCCC" the next chunk is "BBB".
+ *
+ * Returns: next chunk
+ *
+ * Since: 2.29
+ */
+char *scols_wrapnl_nextchunk(const struct libscols_column *cl __attribute__((unused)),
+			char *data,
+			void *userdata __attribute__((unused)))
+{
+	char *p = data ? strchr(data, '\n') : NULL;
+
+	if (p) {
+		*p = '\0';
+		return p + 1;
+	}
+	return NULL;
+}
+
+/**
+ * scols_wrapnl_chunksize:
+ * @cl: a pointer to a struct libscols_column instance
+ * @data: string
+ * @userdata: callback private data
+ *
+ * Analyzes @data and returns size of the largest chunk. The chunks are based
+ * on \n. For example for data "AAA\nBBB\nCCCC" the largest chunk size is 4.
+ *
+ * Note that the size has to be based on number of terminal cells rather than
+ * bytes to support multu-byte output.
+ *
+ * Returns: size of the largest chunk.
+ *
+ * Since: 2.29
+ */
+size_t scols_wrapnl_chunksize(const struct libscols_column *cl __attribute__((unused)),
+		const char *data,
+		void *userdata __attribute__((unused)))
+{
+	size_t sum = 0;
+
+	while (data && *data) {
+		const char *p;
+		size_t sz;
+
+		p = strchr(data, '\n');
+		if (p) {
+			sz = cl->table && scols_table_is_noencoding(cl->table) ?
+					mbs_nwidth(data, p - data) :
+					mbs_safe_nwidth(data, p - data, NULL);
+			p++;
+		} else {
+			sz = cl->table && scols_table_is_noencoding(cl->table) ?
+					mbs_width(data) :
+					mbs_safe_width(data);
+		}
+		sum = max(sum, sz);
+		data = p;
+	}
+
+	return sum;
+}
+
+/**
+ * scols_column_set_cmpfunc:
+ * @cl: column
+ * @cmp: pointer to compare function
+ * @data: private data for cmp function
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_column_set_cmpfunc(struct libscols_column *cl,
+			int (*cmp)(struct libscols_cell *,
+				   struct libscols_cell *,
+				   void *),
+			void *data)
+{
+	if (!cl)
+		return -EINVAL;
+
+	cl->cmpfunc = cmp;
+	cl->cmpfunc_data = data;
+	return 0;
+}
+
+/**
+ * scols_column_set_wrapfunc:
+ * @cl: a pointer to a struct libscols_column instance
+ * @wrap_chunksize: function to return size of the largest chink of data
+ * @wrap_nextchunk: function to return next zero terminated data
+ * @userdata: optional stuff for callbacks
+ *
+ * Extends SCOLS_FL_WRAP and can be used to set custom wrap function. The default
+ * is to wrap by column size, but you can create functions to wrap for example
+ * after \n or after words, etc.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.29
+ */
+int scols_column_set_wrapfunc(struct libscols_column *cl,
+			size_t (*wrap_chunksize)(const struct libscols_column *,
+						 const char *,
+						 void *),
+			char * (*wrap_nextchunk)(const struct libscols_column *,
+						 char *,
+						 void *),
+			void *userdata)
+{
+	if (!cl)
+		return -EINVAL;
+
+	cl->wrap_nextchunk = wrap_nextchunk;
+	cl->wrap_chunksize = wrap_chunksize;
+	cl->wrapfunc_data = userdata;
+	return 0;
+}
+
+/**
+ * scols_column_set_safechars:
+ * @cl: a pointer to a struct libscols_column instance
+ * @safe: safe characters (e.g. "\n\t")
+ *
+ * Use for bytes you don't want to encode on output. This is for example
+ * necessary if you want to use custom wrap function based on \n, in this case
+ * you have to set "\n" as a safe char.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.29
+ */
+int scols_column_set_safechars(struct libscols_column *cl, const char *safe)
+{
+	return strdup_to_struct_member(cl, safechars, safe);
+}
+
+/**
+ * scols_column_get_safechars:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Returns: safe chars
+ *
+ * Since: 2.29
+ */
+const char *scols_column_get_safechars(const struct libscols_column *cl)
+{
+	return cl->safechars;
+}
+
+/**
+ * scols_column_get_width:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Important note: the column width is unknown until library starts printing
+ * (width is calculated before printing). The function is usable for example in
+ * nextchunk() callback specified by scols_column_set_wrapfunc().
+ *
+ * See also scols_column_get_whint(), it returns wanted size (!= final size).
+ *
+ * Returns: column width
+ *
+ * Since: 2.29
+ */
+size_t scols_column_get_width(const struct libscols_column *cl)
+{
+	return cl->width;
+}
+
+/**
+ * scols_column_is_hidden:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Gets the value of @cl's flag hidden.
+ *
+ * Returns: 0 or 1
+ *
+ * Since: 2.27
+ */
+int scols_column_is_hidden(const struct libscols_column *cl)
+{
+	return cl->flags & SCOLS_FL_HIDDEN ? 1 : 0;
+}
+
+/**
+ * scols_column_is_trunc:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Gets the value of @cl's flag trunc.
+ *
+ * Returns: 0 or 1
+ */
+int scols_column_is_trunc(const struct libscols_column *cl)
+{
+	return cl->flags & SCOLS_FL_TRUNC ? 1 : 0;
+}
+/**
+ * scols_column_is_tree:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Gets the value of @cl's flag tree.
+ *
+ * Returns: 0 or 1
+ */
+int scols_column_is_tree(const struct libscols_column *cl)
+{
+	return cl->flags & SCOLS_FL_TREE ? 1 : 0;
+}
+/**
+ * scols_column_is_right:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Gets the value of @cl's flag right.
+ *
+ * Returns: 0 or 1
+ */
+int scols_column_is_right(const struct libscols_column *cl)
+{
+	return cl->flags & SCOLS_FL_RIGHT ? 1 : 0;
+}
+/**
+ * scols_column_is_strict_width:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Gets the value of @cl's flag strict_width.
+ *
+ * Returns: 0 or 1
+ */
+int scols_column_is_strict_width(const struct libscols_column *cl)
+{
+	return cl->flags & SCOLS_FL_STRICTWIDTH ? 1 : 0;
+}
+/**
+ * scols_column_is_noextremes:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Gets the value of @cl's flag no_extremes.
+ *
+ * Returns: 0 or 1
+ */
+int scols_column_is_noextremes(const struct libscols_column *cl)
+{
+	return cl->flags & SCOLS_FL_NOEXTREMES ? 1 : 0;
+}
+/**
+ * scols_column_is_wrap:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Gets the value of @cl's flag wrap.
+ *
+ * Returns: 0 or 1
+ *
+ * Since: 2.28
+ */
+int scols_column_is_wrap(const struct libscols_column *cl)
+{
+	return cl->flags & SCOLS_FL_WRAP ? 1 : 0;
+}
+/**
+ * scols_column_is_customwrap:
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Returns: 0 or 1
+ *
+ * Since: 2.29
+ */
+int scols_column_is_customwrap(const struct libscols_column *cl)
+{
+	return (cl->flags & SCOLS_FL_WRAP)
+		&& cl->wrap_chunksize
+		&& cl->wrap_nextchunk ? 1 : 0;
+}
+
+/**
+ * scols_column_set_properties:
+ * @cl: a pointer to a struct libscols_column instance
+ * @opts: options string
+ *
+ * Set properties from string, the string is comma seprated list, like
+ * "trunc,right,json=number", ...
+ *
+ * Returns: 0 on success, <0 on error
+ *
+ * Since: 2.39
+ */
+int scols_column_set_properties(struct libscols_column *cl, const char *opts)
+{
+	char *str = (char *) opts;
+	char *name, *value;
+	size_t namesz, valuesz;
+	unsigned int flags = 0;
+	int rc = 0;
+
+	DBG(COL, ul_debugobj(cl, "apply properties '%s'", opts));
+
+	while (rc == 0
+	       && !ul_optstr_next(&str, &name, &namesz, &value, &valuesz)) {
+
+		if (strncmp(name, "trunc", namesz) == 0)
+			flags |= SCOLS_FL_TRUNC;
+
+		else if (strncmp(name, "tree", namesz) == 0)
+			flags |= SCOLS_FL_TREE;
+
+		else if (strncmp(name, "right", namesz) == 0)
+			flags |= SCOLS_FL_RIGHT;
+
+		else if (strncmp(name, "strictwidth", namesz) == 0)
+			flags |= SCOLS_FL_STRICTWIDTH;
+
+		else if (strncmp(name, "noextremes", namesz) == 0)
+			flags |= SCOLS_FL_STRICTWIDTH;
+
+		else if (strncmp(name, "hidden", namesz) == 0)
+			flags |= SCOLS_FL_HIDDEN;
+
+		else if (strncmp(name, "wrap", namesz) == 0)
+			flags |= SCOLS_FL_WRAP;
+
+		else if (value && strncmp(name, "json", namesz) == 0) {
+
+			if (strncmp(value, "string", valuesz) == 0)
+				rc = scols_column_set_json_type(cl, SCOLS_JSON_STRING);
+			else if (strncmp(value, "number", valuesz) == 0)
+				rc = scols_column_set_json_type(cl, SCOLS_JSON_NUMBER);
+			else if (strncmp(value, "array-string", valuesz) == 0)
+				rc = scols_column_set_json_type(cl, SCOLS_JSON_ARRAY_STRING);
+			else if (strncmp(value, "array-number", valuesz) == 0)
+				rc = scols_column_set_json_type(cl, SCOLS_JSON_ARRAY_NUMBER);
+			else if (strncmp(value, "boolean", valuesz) == 0)
+				rc = scols_column_set_json_type(cl, SCOLS_JSON_BOOLEAN);
+
+		} else if (value && strncmp(name, "width", namesz) == 0) {
+
+			char *end = NULL;
+			double x = strtod(value, &end);
+			if (errno || str == end)
+				return -EINVAL;
+
+			rc = scols_column_set_whint(cl, x);
+
+		} else if (value && strncmp(name, "color", namesz) == 0) {
+
+			char *x = strndup(value, valuesz);
+			if (x) {
+				scols_column_set_color(cl, x);
+				free(x);
+			}
+
+		} else if (value && strncmp(name, "name", namesz) == 0) {
+
+			char *x = strndup(value, valuesz);
+			if (x) {
+				scols_column_set_name(cl, x);
+				free(x);
+			}
+		}
+	}
+
+	if (!rc && flags)
+		rc = scols_column_set_flags(cl, flags);
+
+	return rc;
+}
+
diff --git a/libsmartcols/src/grouping.c b/libsmartcols/src/grouping.c
new file mode 100644
index 0000000..0b27cb2
--- /dev/null
+++ b/libsmartcols/src/grouping.c
@@ -0,0 +1,575 @@
+/*
+ * Copyright (C) 2018 Karel Zak <kzak@redhat.com>
+ */
+#include "smartcolsP.h"
+
+/**
+ * SECTION: grouping
+ * @title: Grouping
+ * @short_description: lines grouing
+ *
+ * Lines groups manipulation API. The grouping API can be used to create M:N
+ * relations between lines and on tree-like output it prints extra chart to
+ * visualize these relations. The group has unlimited number of members and
+ * group childs. See libsmartcols/sample/grouping* for more details.
+ */
+
+/* Private API */
+void scols_ref_group(struct libscols_group *gr)
+{
+	if (gr)
+		gr->refcount++;
+}
+
+void scols_group_remove_children(struct libscols_group *gr)
+{
+	if (!gr)
+		return;
+
+	while (!list_empty(&gr->gr_children)) {
+		struct libscols_line *ln = list_entry(gr->gr_children.next,
+						struct libscols_line, ln_children);
+
+		DBG(GROUP, ul_debugobj(gr, "remove child"));
+		list_del_init(&ln->ln_children);
+		scols_ref_group(ln->parent_group);
+		ln->parent_group = NULL;
+		scols_unref_line(ln);
+	}
+}
+
+void scols_group_remove_members(struct libscols_group *gr)
+{
+	if (!gr)
+		return;
+
+	while (!list_empty(&gr->gr_members)) {
+		struct libscols_line *ln = list_entry(gr->gr_members.next,
+						struct libscols_line, ln_groups);
+
+		DBG(GROUP, ul_debugobj(gr, "remove member [%p]", ln));
+		list_del_init(&ln->ln_groups);
+
+		scols_unref_group(ln->group);
+		ln->group->nmembers++;
+		ln->group = NULL;
+
+		scols_unref_line(ln);
+	}
+}
+
+/* note group has to be already without members to deallocate */
+void scols_unref_group(struct libscols_group *gr)
+{
+	if (gr && --gr->refcount <= 0) {
+		DBG(GROUP, ul_debugobj(gr, "dealloc"));
+		scols_group_remove_children(gr);
+		list_del(&gr->gr_groups);
+		free(gr);
+		return;
+	}
+}
+
+
+static void groups_fix_members_order(struct libscols_line *ln)
+{
+	struct libscols_iter itr;
+	struct libscols_line *child;
+
+	if (ln->group) {
+		INIT_LIST_HEAD(&ln->ln_groups);
+		list_add_tail(&ln->ln_groups, &ln->group->gr_members);
+		DBG(GROUP, ul_debugobj(ln->group, "fixing member line=%p [%zu/%zu]",
+					ln, ln->group->nmembers,
+					list_count_entries(&ln->group->gr_members)));
+	}
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_line_next_child(ln, &itr, &child) == 0)
+		groups_fix_members_order(child);
+
+	/*
+	 * We modify gr_members list, so is_last_group_member() does not have
+	 * to provide reliable answer, we need to verify by list_count_entries().
+	 */
+	if (ln->group
+	    && is_last_group_member(ln)
+	    && ln->group->nmembers == list_count_entries(&ln->group->gr_members)) {
+
+		DBG(GROUP, ul_debugobj(ln->group, "fixing childs"));
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (scols_line_next_group_child(ln, &itr, &child) == 0)
+			groups_fix_members_order(child);
+	}
+}
+
+void scols_groups_fix_members_order(struct libscols_table *tb)
+{
+	struct libscols_iter itr;
+	struct libscols_line *ln;
+	struct libscols_group *gr;
+
+	/* remove all from groups lists */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_group(tb, &itr, &gr) == 0) {
+		while (!list_empty(&gr->gr_members)) {
+			struct libscols_line *line = list_entry(gr->gr_members.next,
+						struct libscols_line, ln_groups);
+			list_del_init(&line->ln_groups);
+		}
+	}
+
+	/* add again to the groups list in order we walk in tree */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_line(tb, &itr, &ln) == 0) {
+		if (ln->parent || ln->parent_group)
+			continue;
+		groups_fix_members_order(ln);
+	}
+
+	/* If group child is member of another group *
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_group(tb, &itr, &gr) == 0) {
+		struct libscols_iter xitr;
+		struct libscols_line *child;
+
+		scols_reset_iter(&xitr, SCOLS_ITER_FORWARD);
+		while (scols_line_next_group_child(ln, &xitr, &child) == 0)
+			groups_fix_members_order(child);
+	}
+	*/
+}
+
+static inline const char *group_state_to_string(int state)
+{
+	static const char *grpstates[] = {
+		[SCOLS_GSTATE_NONE]		= "none",
+		[SCOLS_GSTATE_FIRST_MEMBER]	= "1st-member",
+		[SCOLS_GSTATE_MIDDLE_MEMBER]	= "middle-member",
+		[SCOLS_GSTATE_LAST_MEMBER]	= "last-member",
+		[SCOLS_GSTATE_MIDDLE_CHILD]	= "middle-child",
+		[SCOLS_GSTATE_LAST_CHILD]	= "last-child",
+		[SCOLS_GSTATE_CONT_MEMBERS]	= "continue-members",
+		[SCOLS_GSTATE_CONT_CHILDREN]	= "continue-children"
+	};
+
+	assert(state >= 0);
+	assert((size_t) state < ARRAY_SIZE(grpstates));
+
+	return grpstates[state];
+}
+/*
+static void grpset_debug(struct libscols_table *tb, struct libscols_line *ln)
+{
+	size_t i;
+
+	for (i = 0; i < tb->grpset_size; i++) {
+		if (tb->grpset[i]) {
+			struct libscols_group *gr = tb->grpset[i];
+
+			if (ln)
+				DBG(LINE, ul_debugobj(ln, "grpset[%zu]: %p %s", i,
+					gr, group_state_to_string(gr->state)));
+			else
+				DBG(LINE, ul_debug("grpset[%zu]: %p %s", i,
+					gr, group_state_to_string(gr->state)));
+		} else if (ln) {
+			DBG(LINE, ul_debugobj(ln, "grpset[%zu]: free", i));
+		} else
+			DBG(LINE, ul_debug("grpset[%zu]: free", i));
+	}
+}
+*/
+static int group_state_for_line(struct libscols_group *gr, struct libscols_line *ln)
+{
+	if (gr->state == SCOLS_GSTATE_NONE &&
+	    (ln->group != gr || !is_first_group_member(ln)))
+		/*
+		 * NONE is possible to translate to FIRST_MEMBER only, and only if
+		 * line group matches with the current group.
+		 */
+		return SCOLS_GSTATE_NONE;
+
+	if (ln->group != gr && ln->parent_group != gr) {
+		/* Not our line, continue */
+		if (gr->state == SCOLS_GSTATE_FIRST_MEMBER ||
+		    gr->state == SCOLS_GSTATE_MIDDLE_MEMBER ||
+		    gr->state == SCOLS_GSTATE_CONT_MEMBERS)
+			return SCOLS_GSTATE_CONT_MEMBERS;
+
+		if (gr->state == SCOLS_GSTATE_LAST_MEMBER ||
+		    gr->state == SCOLS_GSTATE_MIDDLE_CHILD ||
+		    gr->state == SCOLS_GSTATE_CONT_CHILDREN)
+			return SCOLS_GSTATE_CONT_CHILDREN;
+
+	} else if (ln->group == gr && is_first_group_member(ln)) {
+		return SCOLS_GSTATE_FIRST_MEMBER;
+
+	} else if (ln->group == gr && is_last_group_member(ln)) {
+		return SCOLS_GSTATE_LAST_MEMBER;
+
+	} else if (ln->group == gr && is_group_member(ln)) {
+		return SCOLS_GSTATE_MIDDLE_MEMBER;
+
+	} else if (ln->parent_group == gr && is_last_group_child(ln)) {
+		return SCOLS_GSTATE_LAST_CHILD;
+
+	} else if (ln->parent_group == gr && is_group_child(ln)) {
+		return SCOLS_GSTATE_MIDDLE_CHILD;
+	}
+
+	return SCOLS_GSTATE_NONE;
+}
+
+/*
+ * apply new @state to the chunk (addressed by @xx) of grpset used for the group (@gr)
+ */
+static void grpset_apply_group_state(struct libscols_group **xx, int state, struct libscols_group *gr)
+{
+	size_t i;
+
+	DBG(GROUP, ul_debugobj(gr, "   applying state to grpset"));
+
+	/* gr->state holds the old state, @state is the new state
+	 */
+	for (i = 0; i < SCOLS_GRPSET_CHUNKSIZ; i++)
+		xx[i] = state == SCOLS_GSTATE_NONE ? NULL : gr;
+
+	gr->state = state;
+}
+
+static struct libscols_group **grpset_locate_freespace(struct libscols_table *tb, int chunks, int prepend)
+{
+	size_t i, avail = 0;
+	struct libscols_group **tmp, **first = NULL;
+	const size_t wanted = chunks * SCOLS_GRPSET_CHUNKSIZ;
+
+	if (!tb->grpset_size)
+		prepend = 0;
+	/*
+	DBG(TAB, ul_debugobj(tb, "orig grpset:"));
+	grpset_debug(tb, NULL);
+	*/
+	if (prepend) {
+		for (i = tb->grpset_size - 1; ; i--) {
+			if (tb->grpset[i] == NULL) {
+				first = &tb->grpset[i];
+				avail++;
+			} else
+				avail = 0;
+			if (avail == wanted)
+				goto done;
+			if (i == 0)
+				break;
+		}
+	} else {
+		for (i = 0; i < tb->grpset_size; i++) {
+			if (tb->grpset[i] == NULL) {
+				if (avail == 0)
+					first = &tb->grpset[i];
+				avail++;
+			} else
+				avail = 0;
+			if (avail == wanted)
+				goto done;
+		}
+	}
+
+	DBG(TAB, ul_debugobj(tb, "   realocate grpset [sz: old=%zu, new=%zu, new_chunks=%d]",
+				tb->grpset_size, tb->grpset_size + wanted, chunks));
+
+	tmp = realloc(tb->grpset, (tb->grpset_size + wanted) * sizeof(struct libscols_group *));
+	if (!tmp)
+		return NULL;
+
+	tb->grpset = tmp;
+
+	if (prepend) {
+		DBG(TAB, ul_debugobj(tb, "   prepending free space"));
+		char *dest = (char *) tb->grpset;
+
+		memmove(	dest + (wanted * sizeof(struct libscols_group *)),
+				tb->grpset,
+				tb->grpset_size * sizeof(struct libscols_group *));
+		first = tb->grpset;
+	} else {
+		first = tb->grpset + tb->grpset_size;
+	}
+
+	memset(first, 0, wanted * sizeof(struct libscols_group *));
+	tb->grpset_size += wanted;
+
+done:
+	/*
+	DBG(TAB, ul_debugobj(tb, "new grpset:"));
+	grpset_debug(tb, NULL);
+	*/
+	return first;
+}
+
+static struct libscols_group **grpset_locate_group(struct libscols_table *tb, struct libscols_group *gr)
+{
+	size_t i;
+
+	for (i = 0; i < tb->grpset_size; i++) {
+		if (gr == tb->grpset[i])
+			return &tb->grpset[i];
+	}
+
+	return NULL;
+}
+
+
+static int grpset_update(struct libscols_table *tb, struct libscols_line *ln, struct libscols_group *gr)
+{
+	struct libscols_group **xx;
+	int state;
+
+	DBG(LINE, ul_debugobj(ln, "   group [%p] grpset update [grpset size=%zu]", gr, tb->grpset_size));
+
+	/* new state, note that gr->state still holds the original state */
+	state = group_state_for_line(gr, ln);
+	DBG(LINE, ul_debugobj(ln, "    state %s --> %s",
+			group_state_to_string(gr->state),
+			group_state_to_string(state)));
+
+	if (state == SCOLS_GSTATE_FIRST_MEMBER && gr->state != SCOLS_GSTATE_NONE) {
+		DBG(LINE, ul_debugobj(ln, "wrong group initialization (%s)", group_state_to_string(gr->state)));
+		abort();
+	}
+	if (state != SCOLS_GSTATE_NONE && gr->state == SCOLS_GSTATE_LAST_CHILD) {
+		DBG(LINE, ul_debugobj(ln, "wrong group termination (%s)", group_state_to_string(gr->state)));
+		abort();
+	}
+	if (gr->state == SCOLS_GSTATE_LAST_MEMBER &&
+	    !(state == SCOLS_GSTATE_LAST_CHILD ||
+	      state == SCOLS_GSTATE_CONT_CHILDREN ||
+	      state == SCOLS_GSTATE_MIDDLE_CHILD ||
+	      state == SCOLS_GSTATE_NONE)) {
+		DBG(LINE, ul_debugobj(ln, "wrong group member->child order"));
+		abort();
+	}
+
+	/* should not happen; probably wrong line... */
+	if (gr->state == SCOLS_GSTATE_NONE && state == SCOLS_GSTATE_NONE)
+		return 0;
+
+	/* locate place in grpset where we draw the group */
+	if (!tb->grpset || gr->state == SCOLS_GSTATE_NONE)
+		xx = grpset_locate_freespace(tb, 1, 1);
+	else
+		xx = grpset_locate_group(tb, gr);
+	if (!xx) {
+		DBG(LINE, ul_debugobj(ln, "failed to locate group or reallocate grpset"));
+		return -ENOMEM;
+	}
+
+	grpset_apply_group_state(xx, state, gr);
+	/*ON_DBG(LINE, grpset_debug(tb, ln));*/
+	return 0;
+}
+
+static int grpset_update_active_groups(struct libscols_table *tb, struct libscols_line *ln)
+{
+	int rc = 0;
+	size_t i;
+	struct libscols_group *last = NULL;
+
+	DBG(LINE, ul_debugobj(ln, "   update for active groups"));
+
+	for (i = 0; i < tb->grpset_size; i++) {
+		struct libscols_group *gr = tb->grpset[i];
+
+		if (!gr || last == gr)
+			continue;
+		last = gr;
+		rc = grpset_update(tb, ln, gr);
+		if (rc)
+			break;
+	}
+
+	DBG(LINE, ul_debugobj(ln, "   <- active groups updated [rc=%d]", rc));
+	return rc;
+}
+
+int scols_groups_update_grpset(struct libscols_table *tb, struct libscols_line *ln)
+{
+	int rc = 0;
+
+	DBG(LINE, ul_debugobj(ln, "  grpset update [line: group=%p, parent_group=%p",
+				ln->group, ln->parent_group));
+
+	rc = grpset_update_active_groups(tb, ln);
+	if (!rc && ln->group && ln->group->state == SCOLS_GSTATE_NONE) {
+		DBG(LINE, ul_debugobj(ln, " introduce a new group"));
+		rc = grpset_update(tb, ln, ln->group);
+	}
+	return rc;
+}
+
+void scols_groups_reset_state(struct libscols_table *tb)
+{
+	struct libscols_iter itr;
+	struct libscols_group *gr;
+
+	DBG(TAB, ul_debugobj(tb, "reset groups states"));
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_group(tb, &itr, &gr) == 0) {
+		DBG(GROUP, ul_debugobj(gr, " reset to NONE"));
+		gr->state = SCOLS_GSTATE_NONE;
+	}
+
+	if (tb->grpset) {
+		DBG(TAB, ul_debugobj(tb, " zeroize grpset"));
+		memset(tb->grpset, 0, tb->grpset_size * sizeof(struct libscols_group *));
+	}
+	tb->ngrpchlds_pending = 0;
+}
+
+static void add_member(struct libscols_group *gr, struct libscols_line *ln)
+{
+	DBG(GROUP, ul_debugobj(gr, "add member %p", ln));
+
+	ln->group = gr;
+	gr->nmembers++;
+	scols_ref_group(gr);
+
+	INIT_LIST_HEAD(&ln->ln_groups);
+	list_add_tail(&ln->ln_groups, &gr->gr_members);
+	scols_ref_line(ln);
+}
+
+/*
+ * Returns first group which is ready to print group children.
+ *
+ * This function scans grpset[] in backward order and returns first group
+ * with SCOLS_GSTATE_CONT_CHILDREN or SCOLS_GSTATE_LAST_MEMBER state.
+ */
+struct libscols_group *scols_grpset_get_printable_children(struct libscols_table *tb)
+{
+	size_t i;
+
+	for (i = tb->grpset_size; i > 0; i -= SCOLS_GRPSET_CHUNKSIZ) {
+		struct libscols_group *gr = tb->grpset[i-1];
+
+		if (gr == NULL)
+			continue;
+		if (gr->state == SCOLS_GSTATE_CONT_CHILDREN ||
+		    gr->state == SCOLS_GSTATE_LAST_MEMBER)
+			return gr;
+	}
+
+	return NULL;
+}
+
+
+/**
+ * scols_table_group_lines:
+ * @tb: a pointer to a struct libscols_table instance
+ * @ln: new group member
+ * @member: group member
+ * @id: group identifier (unused, not implemented yet), use zero.
+ *
+ * This function add line @ln to group of lines represented by @member.  If the
+ * group is not yet defined (@member is not member of any group) than a new one
+ * is allocated.
+ *
+ * The @ln maybe a NULL -- in this case only a new group is allocated if not
+ * defined yet.
+ *
+ * Note that the same line cannot be member of more groups (not implemented
+ * yet). The child of any group can be member of another group.
+ *
+ * The @id is not used for now, use 0. The plan is to use it to support
+ * multi-group membership in future.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_table_group_lines(	struct libscols_table *tb,
+				struct libscols_line *ln,
+				struct libscols_line *member,
+				__attribute__((__unused__)) int id)
+{
+	struct libscols_group *gr = NULL;
+
+	if (!tb || !member) {
+		DBG(GROUP, ul_debugobj(gr, "failed group lines (no table or member)"));
+		return -EINVAL;
+	}
+	if (ln)  {
+		if (ln->group && !member->group) {
+			DBG(GROUP, ul_debugobj(gr, "failed group lines (new group, line member of another)"));
+			return -EINVAL;
+		}
+		if (ln->group && member->group && ln->group != member->group) {
+			DBG(GROUP, ul_debugobj(gr, "failed group lines (groups mismatch bwteen member and line"));
+			return -EINVAL;
+		}
+	}
+
+	gr = member->group;
+
+	/* create a new group */
+	if (!gr) {
+		gr = calloc(1, sizeof(*gr));
+		if (!gr)
+			return -ENOMEM;
+		DBG(GROUP, ul_debugobj(gr, "alloc"));
+		gr->refcount = 1;
+		INIT_LIST_HEAD(&gr->gr_members);
+		INIT_LIST_HEAD(&gr->gr_children);
+		INIT_LIST_HEAD(&gr->gr_groups);
+
+		/* add group to the table */
+		list_add_tail(&gr->gr_groups, &tb->tb_groups);
+
+		/* add the first member */
+		add_member(gr, member);
+	}
+
+	/* add to group */
+	if (ln && !ln->group)
+		add_member(gr, ln);
+
+	return 0;
+}
+
+/**
+ * scols_line_link_group:
+ * @ln: line instance
+ * @member: group member
+ * @id: group identifier (unused, not implemented yet))
+ *
+ * Define @ln as child of group represented by group @member. The line @ln
+ * cannot be child of any other line. It's possible to create group->child or
+ * parent->child relationship, but no both for the same line (child).
+ *
+ * The @id is not used for now, use 0. The plan is to use it to support
+ * multi-group membership in future.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_line_link_group(struct libscols_line *ln, struct libscols_line *member,
+		 __attribute__((__unused__)) int id)
+{
+	if (!ln || !member || !member->group || ln->parent)
+		return -EINVAL;
+
+	if (!list_empty(&ln->ln_children))
+		return -EINVAL;
+
+	DBG(GROUP, ul_debugobj(member->group, "add child"));
+
+	list_add_tail(&ln->ln_children, &member->group->gr_children);
+	scols_ref_line(ln);
+
+	ln->parent_group = member->group;
+	scols_ref_group(member->group);
+
+	return 0;
+}
diff --git a/libsmartcols/src/init.c b/libsmartcols/src/init.c
new file mode 100644
index 0000000..dfd7510
--- /dev/null
+++ b/libsmartcols/src/init.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * SECTION: init
+ * @title: Library initialization
+ * @short_description: initialize debugging
+ *
+ * The library debug stuff.
+ */
+
+#include <stdarg.h>
+
+#include "smartcolsP.h"
+
+UL_DEBUG_DEFINE_MASK(libsmartcols);
+UL_DEBUG_DEFINE_MASKNAMES(libsmartcols) =
+{
+	{ "all", SCOLS_DEBUG_ALL,	"info about all subsystems" },
+	{ "buff", SCOLS_DEBUG_BUFF,	"output buffer utils" },
+	{ "cell", SCOLS_DEBUG_CELL,	"table cell utils" },
+	{ "col", SCOLS_DEBUG_COL,	"cols utils" },
+	{ "help", SCOLS_DEBUG_HELP,	"this help" },
+	{ "group", SCOLS_DEBUG_GROUP,	"lines grouping utils" },
+	{ "line", SCOLS_DEBUG_LINE,	"table line utils" },
+	{ "tab", SCOLS_DEBUG_TAB,	"table utils" },
+	{ NULL, 0, NULL }
+};
+
+/**
+ * scols_init_debug:
+ * @mask: debug mask (0xffff to enable full debugging)
+ *
+ * If the @mask is not specified, then this function reads
+ * the LIBSMARTCOLS_DEBUG environment variable to get the mask.
+ *
+ * Already initialized debugging stuff cannot be changed. Calling
+ * this function twice has no effect.
+ */
+void scols_init_debug(int mask)
+{
+	if (libsmartcols_debug_mask)
+		return;
+
+	__UL_INIT_DEBUG_FROM_ENV(libsmartcols, SCOLS_DEBUG_, mask, LIBSMARTCOLS_DEBUG);
+
+	if (libsmartcols_debug_mask != SCOLS_DEBUG_INIT
+	    && libsmartcols_debug_mask != (SCOLS_DEBUG_HELP|SCOLS_DEBUG_INIT)) {
+		const char *ver = NULL;
+
+		scols_get_library_version(&ver);
+
+		DBG(INIT, ul_debug("library debug mask: 0x%04x", libsmartcols_debug_mask));
+		DBG(INIT, ul_debug("library version: %s", ver));
+	}
+	ON_DBG(HELP, ul_debug_print_masks("LIBSMARTCOLS_DEBUG",
+				UL_DEBUG_MASKNAMES(libsmartcols)));
+}
diff --git a/libsmartcols/src/iter.c b/libsmartcols/src/iter.c
new file mode 100644
index 0000000..91cc080
--- /dev/null
+++ b/libsmartcols/src/iter.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2009-2014 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * SECTION: iter
+ * @title: Iterator
+ * @short_description: unified iterator
+ *
+ * The iterator keeps the direction and the last position
+ * for access to the internal library tables/lists.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "smartcolsP.h"
+
+/**
+ * scols_new_iter:
+ * @direction: SCOLS_INTER_{FOR,BACK}WARD direction
+ *
+ * Returns: newly allocated generic libmount iterator.
+ */
+struct libscols_iter *scols_new_iter(int direction)
+{
+	struct libscols_iter *itr = calloc(1, sizeof(*itr));
+	if (!itr)
+		return NULL;
+	itr->direction = direction;
+	return itr;
+}
+
+/**
+ * scols_free_iter:
+ * @itr: iterator pointer
+ *
+ * Deallocates the iterator.
+ */
+void scols_free_iter(struct libscols_iter *itr)
+{
+	free(itr);
+}
+
+/**
+ * scols_reset_iter:
+ * @itr: iterator pointer
+ * @direction: SCOLS_INTER_{FOR,BACK}WARD or -1 to keep the direction unchanged
+ *
+ * Resets the iterator.
+ */
+void scols_reset_iter(struct libscols_iter *itr, int direction)
+{
+	if (direction == -1)
+		direction = itr->direction;
+
+	memset(itr, 0, sizeof(*itr));
+	itr->direction = direction;
+}
+
+/**
+ * scols_iter_get_direction:
+ * @itr: iterator pointer
+ *
+ * Returns: SCOLS_INTER_{FOR,BACK}WARD
+ */
+int scols_iter_get_direction(const struct libscols_iter *itr)
+{
+	return itr->direction;
+}
diff --git a/libsmartcols/src/libsmartcols.h.in b/libsmartcols/src/libsmartcols.h.in
new file mode 100644
index 0000000..f5820e9
--- /dev/null
+++ b/libsmartcols/src/libsmartcols.h.in
@@ -0,0 +1,349 @@
+/*
+ * Prints table or tree.
+ *
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#ifndef _LIBSMARTCOLS_H
+#define _LIBSMARTCOLS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+/**
+ * LIBSMARTCOLS_VERSION:
+ *
+ * Library version string
+ */
+#define LIBSMARTCOLS_VERSION   "@LIBSMARTCOLS_VERSION@"
+
+/**
+ * libscols_iter:
+ *
+ * Generic iterator
+ */
+struct libscols_iter;
+
+/**
+ * libscols_symbols:
+ *
+ * Symbol groups for printing tree hierarchies
+ */
+struct libscols_symbols;
+
+/**
+ * libscols_cell:
+ *
+ * A cell - the smallest library object
+ */
+struct libscols_cell;
+
+/**
+ * libscols_line:
+ *
+ * A line - an array of cells
+ */
+struct libscols_line;
+
+/**
+ * libscols_table:
+ *
+ * A table - The most abstract object, encapsulating lines, columns, symbols and cells
+ */
+struct libscols_table;
+
+/**
+ * libscols_column:
+ *
+ * A column - defines the number of columns and column names
+ */
+struct libscols_column;
+
+/* iter.c */
+enum {
+
+	SCOLS_ITER_FORWARD = 0,
+	SCOLS_ITER_BACKWARD
+};
+
+/*
+ * Column flags
+ */
+enum {
+	SCOLS_FL_TRUNC       = (1 << 0),   /* truncate fields data if necessary */
+	SCOLS_FL_TREE        = (1 << 1),   /* use tree "ascii art" */
+	SCOLS_FL_RIGHT	     = (1 << 2),   /* align to the right */
+	SCOLS_FL_STRICTWIDTH = (1 << 3),   /* don't reduce width if column is empty */
+	SCOLS_FL_NOEXTREMES  = (1 << 4),   /* ignore extreme fields when count column width*/
+	SCOLS_FL_HIDDEN	     = (1 << 5),   /* maintain data, but don't print */
+	SCOLS_FL_WRAP	     = (1 << 6)    /* wrap long lines to multi-line cells */
+};
+
+/*
+ * Column JSON types
+ */
+enum {
+	SCOLS_JSON_STRING    = 0,	/* default */
+	SCOLS_JSON_NUMBER    = 1,
+	SCOLS_JSON_BOOLEAN   = 2,
+	SCOLS_JSON_ARRAY_STRING = 3,        /* e.g. for multi-line (SCOLS_FL_WRAP) cells */
+	SCOLS_JSON_ARRAY_NUMBER	= 4,
+	SCOLS_JSON_BOOLEAN_OPTIONAL = 5,
+};
+
+/*
+ * Cell flags, see scols_cell_set_flags() before use
+ */
+enum {
+	/* alignment evaluated in order: right,center,left */
+	SCOLS_CELL_FL_LEFT    = 0,
+	SCOLS_CELL_FL_CENTER  = (1 << 0),
+	SCOLS_CELL_FL_RIGHT   = (1 << 1)
+};
+
+extern struct libscols_iter *scols_new_iter(int direction);
+extern void scols_free_iter(struct libscols_iter *itr);
+extern void scols_reset_iter(struct libscols_iter *itr, int direction);
+extern int scols_iter_get_direction(const struct libscols_iter *itr);
+
+/* init.c */
+extern void scols_init_debug(int mask);
+
+/* version.c */
+extern int scols_parse_version_string(const char *ver_string);
+extern int scols_get_library_version(const char **ver_string);
+
+/* symbols.c */
+extern struct libscols_symbols *scols_new_symbols(void);
+extern void scols_ref_symbols(struct libscols_symbols *sy);
+extern void scols_unref_symbols(struct libscols_symbols *sy);
+extern struct libscols_symbols *scols_copy_symbols(const struct libscols_symbols *sy);
+extern int scols_symbols_set_branch(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_vertical(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_right(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_title_padding(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_cell_padding(struct libscols_symbols *sy, const char *str);
+
+extern int scols_symbols_set_group_vertical(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_group_horizontal(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_group_first_member(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_group_last_member(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_group_middle_member(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_group_last_child(struct libscols_symbols *sy, const char *str);
+extern int scols_symbols_set_group_middle_child(struct libscols_symbols *sy, const char *str);
+
+/* cell.c */
+extern int scols_reset_cell(struct libscols_cell *ce);
+extern int scols_cell_copy_content(struct libscols_cell *dest,
+				   const struct libscols_cell *src);
+extern int scols_cell_set_data(struct libscols_cell *ce, const char *data);
+extern int scols_cell_refer_data(struct libscols_cell *ce, char *data);
+extern const char *scols_cell_get_data(const struct libscols_cell *ce);
+extern int scols_cell_set_color(struct libscols_cell *ce, const char *color);
+extern const char *scols_cell_get_color(const struct libscols_cell *ce);
+
+extern int scols_cell_set_flags(struct libscols_cell *ce, int flags);
+extern int scols_cell_get_flags(const struct libscols_cell *ce);
+extern int scols_cell_get_alignment(const struct libscols_cell *ce);
+
+extern void *scols_cell_get_userdata(struct libscols_cell *ce);
+extern int scols_cell_set_userdata(struct libscols_cell *ce, void *data);
+
+extern int scols_cmpstr_cells(struct libscols_cell *a,
+			      struct libscols_cell *b, void *data);
+/* column.c */
+extern int scols_column_is_tree(const struct libscols_column *cl);
+extern int scols_column_is_trunc(const struct libscols_column *cl);
+extern int scols_column_is_right(const struct libscols_column *cl);
+extern int scols_column_is_strict_width(const struct libscols_column *cl);
+extern int scols_column_is_hidden(const struct libscols_column *cl);
+extern int scols_column_is_noextremes(const struct libscols_column *cl);
+extern int scols_column_is_wrap(const struct libscols_column *cl);
+extern int scols_column_is_customwrap(const struct libscols_column *cl);
+
+extern size_t scols_column_get_width(const struct libscols_column *cl);
+
+extern int scols_column_set_safechars(struct libscols_column *cl, const char *safe);
+extern const char *scols_column_get_safechars(const struct libscols_column *cl);
+
+extern int scols_column_set_json_type(struct libscols_column *cl, int type);
+extern int scols_column_get_json_type(const struct libscols_column *cl);
+
+extern int scols_column_set_flags(struct libscols_column *cl, int flags);
+extern int scols_column_get_flags(const struct libscols_column *cl);
+extern struct libscols_column *scols_new_column(void);
+extern void scols_ref_column(struct libscols_column *cl);
+extern void scols_unref_column(struct libscols_column *cl);
+extern struct libscols_column *scols_copy_column(const struct libscols_column *cl);
+extern int scols_column_set_whint(struct libscols_column *cl, double whint);
+extern double scols_column_get_whint(const struct libscols_column *cl);
+extern struct libscols_cell *scols_column_get_header(struct libscols_column *cl);
+extern int scols_column_set_color(struct libscols_column *cl, const char *color);
+extern const char *scols_column_get_color(const struct libscols_column *cl);
+extern struct libscols_table *scols_column_get_table(const struct libscols_column *cl);
+
+extern int scols_column_set_name(struct libscols_column *cl, const char *name);
+extern const char *scols_column_get_name(struct libscols_column *cl);
+extern const char *scols_column_get_name_as_shellvar(struct libscols_column *cl);
+
+extern int scols_column_set_properties(struct libscols_column *cl, const char *opts);
+
+extern int scols_column_set_cmpfunc(struct libscols_column *cl,
+			int (*cmp)(struct libscols_cell *a,
+				   struct libscols_cell *b, void *),
+			void *data);
+
+extern int scols_column_set_wrapfunc(struct libscols_column *cl,
+			size_t (*wrap_chunksize)(const struct libscols_column *,
+					 const char *, void *),
+			char * (*wrap_nextchunk)(const struct libscols_column *,
+					 char *, void *),
+			void *userdata);
+
+extern char *scols_wrapnl_nextchunk(const struct libscols_column *cl, char *data, void *userdata);
+extern size_t scols_wrapnl_chunksize(const struct libscols_column *cl, const char *data, void *userdata);
+
+/* line.c */
+extern struct libscols_line *scols_new_line(void);
+extern void scols_ref_line(struct libscols_line *ln);
+extern void scols_unref_line(struct libscols_line *ln);
+extern int scols_line_alloc_cells(struct libscols_line *ln, size_t n);
+extern void scols_line_free_cells(struct libscols_line *ln);
+extern int scols_line_set_userdata(struct libscols_line *ln, void *data);
+extern void *scols_line_get_userdata(struct libscols_line *ln);
+extern int scols_line_remove_child(struct libscols_line *ln, struct libscols_line *child);
+extern int scols_line_add_child(struct libscols_line *ln, struct libscols_line *child);
+extern int scols_line_has_children(struct libscols_line *ln);
+extern int scols_line_is_ancestor(struct libscols_line *ln, struct libscols_line *parent);
+extern int scols_line_next_child(struct libscols_line *ln,
+			  struct libscols_iter *itr, struct libscols_line **chld);
+extern struct libscols_line *scols_line_get_parent(const struct libscols_line *ln);
+extern int scols_line_set_color(struct libscols_line *ln, const char *color);
+extern const char *scols_line_get_color(const struct libscols_line *ln);
+extern size_t scols_line_get_ncells(const struct libscols_line *ln);
+extern struct libscols_cell *scols_line_get_cell(struct libscols_line *ln, size_t n);
+extern struct libscols_cell *scols_line_get_column_cell(
+		                        struct libscols_line *ln,
+		                        struct libscols_column *cl);
+extern int scols_line_set_data(struct libscols_line *ln, size_t n, const char *data);
+extern int scols_line_refer_data(struct libscols_line *ln, size_t n, char *data);
+extern int scols_line_set_column_data(struct libscols_line *ln, struct libscols_column *cl, const char *data);
+extern const char *scols_line_get_column_data(struct libscols_line *ln, struct libscols_column *cl);
+extern int scols_line_refer_column_data(struct libscols_line *ln, struct libscols_column *cl, char *data);
+extern struct libscols_line *scols_copy_line(const struct libscols_line *ln);
+
+/* table */
+extern int scols_table_colors_wanted(const struct libscols_table *tb);
+extern int scols_table_set_name(struct libscols_table *tb, const char *name);
+extern const char *scols_table_get_name(const struct libscols_table *tb);
+extern struct libscols_cell *scols_table_get_title(struct libscols_table *tb);
+extern int scols_table_is_raw(const struct libscols_table *tb);
+extern int scols_table_is_ascii(const struct libscols_table *tb);
+extern int scols_table_is_json(const struct libscols_table *tb);
+extern int scols_table_is_noheadings(const struct libscols_table *tb);
+extern int scols_table_is_header_repeat(const struct libscols_table *tb);
+extern int scols_table_is_empty(const struct libscols_table *tb);
+extern int scols_table_is_export(const struct libscols_table *tb);
+extern int scols_table_is_shellvar(const struct libscols_table *tb);
+extern int scols_table_is_maxout(const struct libscols_table *tb);
+extern int scols_table_is_minout(const struct libscols_table *tb);
+extern int scols_table_is_nowrap(const struct libscols_table *tb);
+extern int scols_table_is_nolinesep(const struct libscols_table *tb);
+extern int scols_table_is_tree(const struct libscols_table *tb);
+extern int scols_table_is_noencoding(const struct libscols_table *tb);
+
+extern int scols_table_enable_colors(struct libscols_table *tb, int enable);
+extern int scols_table_enable_raw(struct libscols_table *tb, int enable);
+extern int scols_table_enable_ascii(struct libscols_table *tb, int enable);
+extern int scols_table_enable_json(struct libscols_table *tb, int enable);
+extern int scols_table_enable_noheadings(struct libscols_table *tb, int enable);
+extern int scols_table_enable_header_repeat(struct libscols_table *tb, int enable);
+extern int scols_table_enable_export(struct libscols_table *tb, int enable);
+extern int scols_table_enable_shellvar(struct libscols_table *tb, int enable);
+extern int scols_table_enable_maxout(struct libscols_table *tb, int enable);
+extern int scols_table_enable_minout(struct libscols_table *tb, int enable);
+extern int scols_table_enable_nowrap(struct libscols_table *tb, int enable);
+extern int scols_table_enable_nolinesep(struct libscols_table *tb, int enable);
+extern int scols_table_enable_noencoding(struct libscols_table *tb, int enable);
+
+extern int scols_table_set_column_separator(struct libscols_table *tb, const char *sep);
+extern int scols_table_set_line_separator(struct libscols_table *tb, const char *sep);
+
+extern struct libscols_table *scols_new_table(void);
+extern void scols_ref_table(struct libscols_table *tb);
+extern void scols_unref_table(struct libscols_table *tb);
+extern int scols_table_add_column(struct libscols_table *tb, struct libscols_column *cl);
+extern int scols_table_remove_column(struct libscols_table *tb, struct libscols_column *cl);
+extern int scols_table_remove_columns(struct libscols_table *tb);
+extern int scols_table_move_column(struct libscols_table *tb, struct libscols_column *pre, struct libscols_column *cl);
+extern struct libscols_column *scols_table_new_column(struct libscols_table *tb, const char *name, double whint, int flags);
+extern int scols_table_next_column(struct libscols_table *tb, struct libscols_iter *itr, struct libscols_column **cl);
+extern int scols_table_set_columns_iter(struct libscols_table *tb, struct libscols_iter *itr, struct libscols_column *cl);
+extern const char *scols_table_get_column_separator(const struct libscols_table *tb);
+extern const char *scols_table_get_line_separator(const struct libscols_table *tb);
+extern size_t scols_table_get_ncols(const struct libscols_table *tb);
+extern size_t scols_table_get_nlines(const struct libscols_table *tb);
+extern struct libscols_column *scols_table_get_column(struct libscols_table *tb, size_t n);
+struct libscols_column *scols_table_get_column_by_name(struct libscols_table *tb, const char *name);
+extern int scols_table_add_line(struct libscols_table *tb, struct libscols_line *ln);
+extern int scols_table_remove_line(struct libscols_table *tb, struct libscols_line *ln);
+extern void scols_table_remove_lines(struct libscols_table *tb);
+extern int scols_table_next_line(struct libscols_table *tb, struct libscols_iter *itr, struct libscols_line **ln);
+extern struct libscols_line *scols_table_new_line(struct libscols_table *tb, struct libscols_line *parent);
+extern struct libscols_line *scols_table_get_line(struct libscols_table *tb, size_t n);
+extern struct libscols_table *scols_copy_table(struct libscols_table *tb);
+extern int scols_table_set_symbols(struct libscols_table *tb, struct libscols_symbols *sy);
+extern int scols_table_set_default_symbols(struct libscols_table *tb);
+extern struct libscols_symbols *scols_table_get_symbols(const struct libscols_table *tb);
+
+extern int scols_table_set_stream(struct libscols_table *tb, FILE *stream);
+extern FILE *scols_table_get_stream(const struct libscols_table *tb);
+extern int scols_table_reduce_termwidth(struct libscols_table *tb, size_t reduce);
+
+extern int scols_sort_table(struct libscols_table *tb, struct libscols_column *cl);
+extern int scols_sort_table_by_tree(struct libscols_table *tb);
+/*
+ *
+ */
+enum {
+	SCOLS_TERMFORCE_AUTO = 0,
+	SCOLS_TERMFORCE_NEVER,
+	SCOLS_TERMFORCE_ALWAYS
+};
+extern int scols_table_set_termforce(struct libscols_table *tb, int force);
+extern int scols_table_get_termforce(const struct libscols_table *tb);
+extern int scols_table_set_termwidth(struct libscols_table *tb, size_t width);
+extern size_t scols_table_get_termwidth(const struct libscols_table *tb);
+extern int scols_table_set_termheight(struct libscols_table *tb, size_t height);
+extern size_t scols_table_get_termheight(const struct libscols_table *tb);
+
+
+/* table_print.c */
+extern int scols_print_table(struct libscols_table *tb);
+extern int scols_print_table_to_string(struct libscols_table *tb, char **data);
+
+extern int scols_table_print_range(	struct libscols_table *tb,
+					struct libscols_line *start,
+					struct libscols_line *end);
+extern int scols_table_print_range_to_string(	struct libscols_table *tb,
+						struct libscols_line *start,
+						struct libscols_line *end,
+						char **data);
+
+/* grouping.c */
+int scols_line_link_group(struct libscols_line *ln, struct libscols_line *member, int id);
+int scols_table_group_lines(struct libscols_table *tb, struct libscols_line *ln,
+                            struct libscols_line *member, int id);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LIBSMARTCOLS_H */
diff --git a/libsmartcols/src/libsmartcols.sym b/libsmartcols/src/libsmartcols.sym
new file mode 100644
index 0000000..4499908
--- /dev/null
+++ b/libsmartcols/src/libsmartcols.sym
@@ -0,0 +1,217 @@
+/*
+ * symbols since util-linux 2.25
+ *
+ * Copyright (C) 2014-2016 Karel Zak <kzak@redhat.com>
+ */
+SMARTCOLS_2.25 {
+global:
+	scols_cell_copy_content;
+	scols_cell_get_color;
+	scols_cell_get_data;
+	scols_cell_get_userdata;
+	scols_cell_refer_data;
+	scols_cell_set_color;
+	scols_cell_set_data;
+	scols_cell_set_userdata;
+	scols_cmpstr_cells;
+	scols_column_get_color;
+	scols_column_get_flags;
+	scols_column_get_header;
+	scols_column_get_whint;
+	scols_column_is_noextremes;
+	scols_column_is_right;
+	scols_column_is_strict_width;
+	scols_column_is_tree;
+	scols_column_is_trunc;
+	scols_column_set_cmpfunc;
+	scols_column_set_color;
+	scols_column_set_flags;
+	scols_column_set_whint;
+	scols_copy_column;
+	scols_copy_line;
+	scols_copy_symbols;
+	scols_copy_table;
+	scols_free_iter;
+	scols_get_library_version;
+	scols_init_debug;
+	scols_iter_get_direction;
+	scols_line_add_child;
+	scols_line_alloc_cells;
+	scols_line_free_cells;
+	scols_line_get_cell;
+	scols_line_get_color;
+	scols_line_get_column_cell;
+	scols_line_get_ncells;
+	scols_line_get_parent;
+	scols_line_get_userdata;
+	scols_line_has_children;
+	scols_line_next_child;
+	scols_line_refer_data;
+	scols_line_remove_child;
+	scols_line_set_color;
+	scols_line_set_data;
+	scols_line_set_userdata;
+	scols_new_column;
+	scols_new_iter;
+	scols_new_line;
+	scols_new_symbols;
+	scols_new_table;
+	scols_parse_version_string;
+	scols_print_table;
+	scols_print_table_to_string;
+	scols_ref_column;
+	scols_ref_line;
+	scols_ref_symbols;
+	scols_ref_table;
+	scols_reset_cell;
+	scols_reset_iter;
+	scols_sort_table;
+	scols_symbols_set_branch;
+	scols_symbols_set_right;
+	scols_symbols_set_vertical;
+	scols_table_add_column;
+	scols_table_add_line;
+	scols_table_colors_wanted;
+	scols_table_enable_ascii;
+	scols_table_enable_colors;
+	scols_table_enable_export;
+	scols_table_enable_maxout;
+	scols_table_enable_noheadings;
+	scols_table_enable_raw;
+	scols_table_get_column;
+	scols_table_get_column_separator;
+	scols_table_get_line;
+	scols_table_get_line_separator;
+	scols_table_get_ncols;
+	scols_table_get_nlines;
+	scols_table_get_stream;
+	scols_table_is_ascii;
+	scols_table_is_empty;
+	scols_table_is_export;
+	scols_table_is_maxout;
+	scols_table_is_noheadings;
+	scols_table_is_raw;
+	scols_table_is_tree;
+	scols_table_new_column;
+	scols_table_new_line;
+	scols_table_next_column;
+	scols_table_next_line;
+	scols_table_reduce_termwidth;
+	scols_table_remove_column;
+	scols_table_remove_columns;
+	scols_table_remove_line;
+	scols_table_remove_lines;
+	scols_table_set_column_separator;
+	scols_table_set_line_separator;
+	scols_table_set_stream;
+	scols_table_set_symbols;
+	scols_unref_column;
+	scols_unref_line;
+	scols_unref_symbols;
+	scols_unref_table;
+local:
+	*;
+};
+
+SMARTCOLS_2.27 {
+global:
+	scols_column_is_hidden;
+	scols_table_enable_json;
+	scols_table_is_json;
+	scols_table_set_name;
+} SMARTCOLS_2.25;
+
+SMARTCOLS_2.28 {
+global:
+	scols_column_is_wrap;
+	scols_line_refer_column_data;
+	scols_line_set_column_data;
+	scols_symbols_set_title_padding;
+	scols_table_enable_nowrap;
+	scols_table_get_title;
+	scols_cell_get_flags;
+	scols_cell_set_flags;
+	scols_table_print_range;
+	scols_table_print_range_to_string;
+	scols_table_enable_nolinesep;
+} SMARTCOLS_2.27;
+
+SMARTCOLS_2.29 {
+global:
+	scols_column_get_safechars;
+	scols_column_get_table;
+	scols_column_get_width;
+	scols_column_is_customwrap;
+	scols_column_set_safechars;
+	scols_column_set_wrapfunc;
+	scols_symbols_set_cell_padding;
+	scols_table_get_name;
+	scols_table_get_symbols;
+	scols_table_get_termforce;
+	scols_table_get_termwidth;
+	scols_table_is_nolinesep;
+	scols_table_is_nowrap;
+	scols_table_set_default_symbols;
+	scols_table_set_termforce;
+	scols_table_set_termwidth;
+	scols_wrapnl_chunksize;
+	scols_wrapnl_nextchunk;
+} SMARTCOLS_2.28;
+
+
+SMARTCOLS_2.30 {
+global:
+	scols_cell_get_alignment;
+	scols_table_move_column;
+	scols_sort_table_by_tree;
+	scols_line_is_ancestor;
+} SMARTCOLS_2.29;
+
+
+SMARTCOLS_2.31 {
+	scols_table_set_termheight;
+	scols_table_get_termheight;
+	scols_table_is_header_repeat;
+	scols_table_enable_header_repeat;
+	scols_table_enable_noencoding;
+	scols_table_is_noencoding;
+} SMARTCOLS_2.30;
+
+
+SMARTCOLS_2.33 {
+	scols_column_set_json_type;
+	scols_column_get_json_type;
+} SMARTCOLS_2.31;
+
+SMARTCOLS_2.34 {
+	scols_table_group_lines;
+	scols_line_link_group;
+	scols_symbols_set_group_vertical;
+	scols_symbols_set_group_horizontal;
+	scols_symbols_set_group_first_member;
+	scols_symbols_set_group_last_member;
+	scols_symbols_set_group_middle_member;
+	scols_symbols_set_group_last_child;
+	scols_symbols_set_group_middle_child;
+} SMARTCOLS_2.33;
+
+SMARTCOLS_2.35 {
+	scols_table_enable_minout;
+	scols_table_is_minout;
+	scols_table_set_columns_iter;
+} SMARTCOLS_2.34;
+
+SMARTCOLS_2.38 {
+	scols_line_get_column_data;
+	scols_column_set_name;
+	scols_column_get_name;
+	scols_column_get_name_as_shellvar;
+	scols_table_is_shellvar;
+	scols_table_enable_shellvar;
+} SMARTCOLS_2.35;
+
+
+SMARTCOLS_2.39 {
+	scols_column_set_properties;
+	scols_table_get_column_by_name;
+} SMARTCOLS_2.38;
diff --git a/libsmartcols/src/line.c b/libsmartcols/src/line.c
new file mode 100644
index 0000000..cab99c5
--- /dev/null
+++ b/libsmartcols/src/line.c
@@ -0,0 +1,563 @@
+/*
+ * line.c - functions for table handling at the line level
+ *
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * SECTION: line
+ * @title: Line
+ * @short_description: cells container, also keeps tree (parent->child) information
+ *
+ * An API to access and modify per-line data and information.
+ */
+
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "smartcolsP.h"
+
+/**
+ * scols_new_line:
+ *
+ * Note that the line is allocated without cells, the cells will be allocated
+ * later when you add the line to the table. If you want to use the line
+ * without table then you have to explicitly allocate the cells by
+ * scols_line_alloc_cells().
+ *
+ * Returns: a pointer to a new struct libscols_line instance.
+ */
+struct libscols_line *scols_new_line(void)
+{
+	struct libscols_line *ln;
+
+	ln = calloc(1, sizeof(*ln));
+	if (!ln)
+		return NULL;
+
+	DBG(LINE, ul_debugobj(ln, "alloc"));
+	ln->refcount = 1;
+	INIT_LIST_HEAD(&ln->ln_lines);
+	INIT_LIST_HEAD(&ln->ln_children);
+	INIT_LIST_HEAD(&ln->ln_branch);
+	INIT_LIST_HEAD(&ln->ln_groups);
+	return ln;
+}
+
+/**
+ * scols_ref_line:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Increases the refcount of @ln.
+ */
+void scols_ref_line(struct libscols_line *ln)
+{
+	if (ln)
+		ln->refcount++;
+}
+
+/**
+ * scols_unref_line:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Decreases the refcount of @ln. When the count falls to zero, the instance
+ * is automatically deallocated.
+ */
+void scols_unref_line(struct libscols_line *ln)
+{
+	if (ln && --ln->refcount <= 0) {
+		DBG(CELL, ul_debugobj(ln, "dealloc"));
+		list_del(&ln->ln_lines);
+		list_del(&ln->ln_children);
+		list_del(&ln->ln_groups);
+		scols_unref_group(ln->group);
+		scols_line_free_cells(ln);
+		free(ln->color);
+		free(ln);
+		return;
+	}
+}
+
+/**
+ * scols_line_free_cells:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Frees the allocated cells referenced to by @ln.
+ */
+void scols_line_free_cells(struct libscols_line *ln)
+{
+	size_t i;
+
+	if (!ln || !ln->cells)
+		return;
+
+	DBG(LINE, ul_debugobj(ln, "free cells"));
+
+	for (i = 0; i < ln->ncells; i++)
+		scols_reset_cell(&ln->cells[i]);
+
+	free(ln->cells);
+	ln->ncells = 0;
+	ln->cells = NULL;
+}
+
+/**
+ * scols_line_alloc_cells:
+ * @ln: a pointer to a struct libscols_line instance
+ * @n: the number of elements
+ *
+ * Allocates space for @n cells. This function is optional,
+ * and libsmartcols automatically allocates necessary cells
+ * according to number of columns in the table when you add
+ * the line to the table. See scols_table_add_line().
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_line_alloc_cells(struct libscols_line *ln, size_t n)
+{
+	struct libscols_cell *ce;
+
+	if (!ln)
+		return -EINVAL;
+	if (ln->ncells == n)
+		return 0;
+
+	if (!n) {
+		scols_line_free_cells(ln);
+		return 0;
+	}
+
+	DBG(LINE, ul_debugobj(ln, "alloc %zu cells", n));
+
+	ce = realloc(ln->cells, n * sizeof(struct libscols_cell));
+	if (!ce)
+		return -errno;
+
+	if (n > ln->ncells)
+		memset(ce + ln->ncells, 0,
+		       (n - ln->ncells) * sizeof(struct libscols_cell));
+
+	ln->cells = ce;
+	ln->ncells = n;
+	return 0;
+}
+
+int scols_line_move_cells(struct libscols_line *ln, size_t newn, size_t oldn)
+{
+	struct libscols_cell ce;
+
+	if (!ln || newn >= ln->ncells || oldn >= ln->ncells)
+		return -EINVAL;
+	if (oldn == newn)
+		return 0;
+
+	DBG(LINE, ul_debugobj(ln, "move cells[%zu] -> cells[%zu]", oldn, newn));
+
+	/* remember data from old position */
+	memcpy(&ce, &ln->cells[oldn], sizeof(struct libscols_cell));
+
+	/* remove old position (move data behind oldn to oldn) */
+	if (oldn + 1 < ln->ncells)
+		memmove(ln->cells + oldn, ln->cells + oldn + 1,
+			(ln->ncells - oldn - 1) * sizeof(struct libscols_cell));
+
+	/* create a space for new position */
+	if (newn + 1 < ln->ncells)
+		memmove(ln->cells + newn + 1, ln->cells + newn,
+			(ln->ncells - newn - 1) * sizeof(struct libscols_cell));
+
+	/* copy original data to new position */
+	memcpy(&ln->cells[newn], &ce, sizeof(struct libscols_cell));
+	return 0;
+}
+
+/**
+ * scols_line_set_userdata:
+ * @ln: a pointer to a struct libscols_line instance
+ * @data: user data
+ *
+ * Binds @data to @ln.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_line_set_userdata(struct libscols_line *ln, void *data)
+{
+	if (!ln)
+		return -EINVAL;
+	ln->userdata = data;
+	return 0;
+}
+
+/**
+ * scols_line_get_userdata:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Returns: user data
+ */
+void *scols_line_get_userdata(struct libscols_line *ln)
+{
+	return ln->userdata;
+}
+
+/**
+ * scols_line_remove_child:
+ * @ln: a pointer to a struct libscols_line instance
+ * @child: a pointer to a struct libscols_line instance
+ *
+ * Removes @child as a child of @ln.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_line_remove_child(struct libscols_line *ln, struct libscols_line *child)
+{
+	if (!ln || !child)
+		return -EINVAL;
+
+	DBG(LINE, ul_debugobj(ln, "remove child"));
+
+	list_del_init(&child->ln_children);
+	child->parent = NULL;
+	scols_unref_line(child);
+
+	scols_unref_line(ln);
+	return 0;
+}
+
+/**
+ * scols_line_add_child:
+ * @ln: a pointer to a struct libscols_line instance
+ * @child: a pointer to a struct libscols_line instance
+ *
+ * Sets @child as a child of @ln.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_line_add_child(struct libscols_line *ln, struct libscols_line *child)
+{
+	if (!ln || !child)
+		return -EINVAL;
+
+	DBG(LINE, ul_debugobj(ln, "add child"));
+	scols_ref_line(child);
+	scols_ref_line(ln);
+
+	/* unref old<->parent */
+	if (child->parent)
+		scols_line_remove_child(child->parent, child);
+
+	/* new reference from parent to child */
+	list_add_tail(&child->ln_children, &ln->ln_branch);
+
+	/* new reference from child to parent */
+	child->parent = ln;
+	return 0;
+}
+
+/**
+ * scols_line_get_parent:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Returns: a pointer to @ln's parent, NULL in case it has no parent or if there was an error.
+ */
+struct libscols_line *scols_line_get_parent(const struct libscols_line *ln)
+{
+	return ln ? ln->parent : NULL;
+}
+
+/**
+ * scols_line_has_children:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Returns: 1 if @ln has any children, otherwise 0.
+ */
+int scols_line_has_children(struct libscols_line *ln)
+{
+	return ln ? !list_empty(&ln->ln_branch) : 0;
+}
+
+/**
+ * scols_line_next_child:
+ * @ln: a pointer to a struct libscols_line instance
+ * @itr: a pointer to a struct libscols_iter instance
+ * @chld: a pointer to a pointer to a struct libscols_line instance
+ *
+ * Finds the next child and returns a pointer to it via @chld.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_line_next_child(struct libscols_line *ln,
+			  struct libscols_iter *itr,
+			  struct libscols_line **chld)
+{
+	int rc = 1;
+
+	if (!ln || !itr || !chld)
+		return -EINVAL;
+	*chld = NULL;
+
+	if (!itr->head)
+		SCOLS_ITER_INIT(itr, &ln->ln_branch);
+	if (itr->p != itr->head) {
+		SCOLS_ITER_ITERATE(itr, *chld, struct libscols_line, ln_children);
+		rc = 0;
+	}
+
+	return rc;
+}
+
+/* private API */
+int scols_line_next_group_child(struct libscols_line *ln,
+			  struct libscols_iter *itr,
+			  struct libscols_line **chld)
+{
+	int rc = 1;
+
+	if (!ln || !itr || !chld || !ln->group)
+		return -EINVAL;
+	*chld = NULL;
+
+	if (!itr->head)
+		SCOLS_ITER_INIT(itr, &ln->group->gr_children);
+	if (itr->p != itr->head) {
+		SCOLS_ITER_ITERATE(itr, *chld, struct libscols_line, ln_children);
+		rc = 0;
+	}
+
+	return rc;
+}
+
+/**
+ * scols_line_is_ancestor:
+ * @ln: line
+ * @parent: potential parent
+ *
+ * The function is designed to detect circular dependencies between @ln and
+ * @parent. It checks if @ln is not any (grand) parent in the @parent's tree.
+ *
+ * Since: 2.30
+ *
+ * Returns: 0 or 1
+ */
+int scols_line_is_ancestor(struct libscols_line *ln, struct libscols_line *parent)
+{
+	while (parent) {
+		if (parent == ln)
+			return 1;
+		parent = scols_line_get_parent(parent);
+	};
+	return 0;
+}
+
+/**
+ * scols_line_set_color:
+ * @ln: a pointer to a struct libscols_line instance
+ * @color: color name or ESC sequence
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_line_set_color(struct libscols_line *ln, const char *color)
+{
+	if (color && !color_is_sequence(color)) {
+		char *seq = color_get_sequence(color);
+		if (!seq)
+			return -EINVAL;
+		free(ln->color);
+		ln->color = seq;
+		return 0;
+	}
+	return strdup_to_struct_member(ln, color, color);
+}
+
+/**
+ * scols_line_get_color:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Returns: @ln's color string, NULL in case of an error.
+ */
+const char *scols_line_get_color(const struct libscols_line *ln)
+{
+	return ln->color;
+}
+
+/**
+ * scols_line_get_ncells:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Returns: number of cells
+ */
+size_t scols_line_get_ncells(const struct libscols_line *ln)
+{
+	return ln->ncells;
+}
+
+/**
+ * scols_line_get_cell:
+ * @ln: a pointer to a struct libscols_line instance
+ * @n: cell number to retrieve
+ *
+ * Returns: the @n-th cell in @ln, NULL in case of an error.
+ */
+struct libscols_cell *scols_line_get_cell(struct libscols_line *ln,
+					  size_t n)
+{
+	if (!ln || n >= ln->ncells)
+		return NULL;
+	return &ln->cells[n];
+}
+
+/**
+ * scols_line_get_column_cell:
+ * @ln: a pointer to a struct libscols_line instance
+ * @cl: pointer to cell
+ *
+ * Like scols_line_get_cell() by cell is referenced by column.
+ *
+ * Returns: the @n-th cell in @ln, NULL in case of an error.
+ */
+struct libscols_cell *scols_line_get_column_cell(
+			struct libscols_line *ln,
+			struct libscols_column *cl)
+{
+	if (!ln || !cl)
+		return NULL;
+
+	return scols_line_get_cell(ln, cl->seqnum);
+}
+
+/**
+ * scols_line_set_data:
+ * @ln: a pointer to a struct libscols_line instance
+ * @n: number of the cell, whose data is to be set
+ * @data: actual data to set
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_line_set_data(struct libscols_line *ln, size_t n, const char *data)
+{
+	struct libscols_cell *ce = scols_line_get_cell(ln, n);
+
+	if (!ce)
+		return -EINVAL;
+	return scols_cell_set_data(ce, data);
+}
+
+/**
+ * scols_line_set_column_data:
+ * @ln: a pointer to a struct libscols_line instance
+ * @cl: column, whose data is to be set
+ * @data: actual data to set
+ *
+ * The same as scols_line_set_data() but cell is referenced by column object.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.28
+ */
+int scols_line_set_column_data(struct libscols_line *ln,
+			       struct libscols_column *cl,
+			       const char *data)
+{
+	return scols_line_set_data(ln, cl->seqnum, data);
+}
+
+/**
+ * scols_line_get_column_data:
+ * @ln: a pointer to a struct libscols_line instance
+ * @cl: column, whose data is to be get
+ *
+ * See also scols_cell_get_data()
+ *
+ * Returns: cell data or NULL.
+ *
+ * Since: 2.38
+ */
+const char *scols_line_get_column_data(struct libscols_line *ln,
+			       struct libscols_column *cl)
+{
+	struct libscols_cell *cell = scols_line_get_column_cell(ln, cl);
+
+	return cell ? scols_cell_get_data(cell) : NULL;
+}
+
+
+/**
+ * scols_line_refer_data:
+ * @ln: a pointer to a struct libscols_line instance
+ * @n: number of the cell which will refer to @data
+ * @data: actual data to refer to
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_line_refer_data(struct libscols_line *ln, size_t n, char *data)
+{
+	struct libscols_cell *ce = scols_line_get_cell(ln, n);
+
+	if (!ce)
+		return -EINVAL;
+	return scols_cell_refer_data(ce, data);
+}
+
+/**
+ * scols_line_refer_column_data:
+ * @ln: a pointer to a struct libscols_line instance
+ * @cl: column, whose data is to be set
+ * @data: actual data to refer to
+ *
+ * The same as scols_line_refer_data() but cell is referenced by column object.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.28
+ */
+int scols_line_refer_column_data(struct libscols_line *ln,
+			       struct libscols_column *cl,
+			       char *data)
+{
+	return scols_line_refer_data(ln, cl->seqnum, data);
+}
+
+/**
+ * scols_copy_line:
+ * @ln: a pointer to a struct libscols_line instance
+ *
+ * Returns: A newly allocated copy of @ln, NULL in case of an error.
+ */
+struct libscols_line *scols_copy_line(const struct libscols_line *ln)
+{
+	struct libscols_line *ret;
+	size_t i;
+
+	if (!ln)
+		return NULL;
+
+	ret = scols_new_line();
+	if (!ret)
+		return NULL;
+	if (scols_line_set_color(ret, ln->color))
+		goto err;
+	if (scols_line_alloc_cells(ret, ln->ncells))
+		goto err;
+
+	ret->userdata = ln->userdata;
+	ret->ncells   = ln->ncells;
+	ret->seqnum   = ln->seqnum;
+
+	DBG(LINE, ul_debugobj(ln, "copy"));
+
+	for (i = 0; i < ret->ncells; ++i) {
+		if (scols_cell_copy_content(&ret->cells[i], &ln->cells[i]))
+			goto err;
+	}
+
+	return ret;
+err:
+	scols_unref_line(ret);
+	return NULL;
+}
diff --git a/libsmartcols/src/print-api.c b/libsmartcols/src/print-api.c
new file mode 100644
index 0000000..52b2664
--- /dev/null
+++ b/libsmartcols/src/print-api.c
@@ -0,0 +1,220 @@
+#include "smartcolsP.h"
+
+/**
+ * scola_table_print_range:
+ * @tb: table
+ * @start: first printed line or NULL to print from the begin of the table
+ * @end: last printed line or NULL to print all from start.
+ *
+ * If the start is the first line in the table than prints table header too.
+ * The header is printed only once. This does not work for trees.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_print_range(	struct libscols_table *tb,
+				struct libscols_line *start,
+				struct libscols_line *end)
+{
+	struct ul_buffer buf = UL_INIT_BUFFER;
+	struct libscols_iter itr;
+	int rc;
+
+	if (scols_table_is_tree(tb))
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "printing range from API"));
+
+	rc = __scols_initialize_printing(tb, &buf);
+	if (rc)
+		return rc;
+
+	if (start) {
+		itr.direction = SCOLS_ITER_FORWARD;
+		itr.head = &tb->tb_lines;
+		itr.p = &start->ln_lines;
+	} else
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+
+	if (!start || itr.p == tb->tb_lines.next) {
+		rc = __scols_print_header(tb, &buf);
+		if (rc)
+			goto done;
+	}
+
+	rc = __scols_print_range(tb, &buf, &itr, end);
+done:
+	__scols_cleanup_printing(tb, &buf);
+	return rc;
+}
+
+/**
+ * scols_table_print_range_to_string:
+ * @tb: table
+ * @start: first printed line or NULL to print from the beginning of the table
+ * @end: last printed line or NULL to print all from start.
+ * @data: pointer to the beginning of a memory area to print to
+ *
+ * The same as scols_table_print_range(), but prints to @data instead of
+ * stream.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+#ifdef HAVE_OPEN_MEMSTREAM
+int scols_table_print_range_to_string(	struct libscols_table *tb,
+					struct libscols_line *start,
+					struct libscols_line *end,
+					char **data)
+{
+	FILE *stream, *old_stream;
+	size_t sz;
+	int rc;
+
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "printing range to string"));
+
+	/* create a stream for output */
+	stream = open_memstream(data, &sz);
+	if (!stream)
+		return -ENOMEM;
+
+	old_stream = scols_table_get_stream(tb);
+	scols_table_set_stream(tb, stream);
+	rc = scols_table_print_range(tb, start, end);
+	fclose(stream);
+	scols_table_set_stream(tb, old_stream);
+
+	return rc;
+}
+#else
+int scols_table_print_range_to_string(
+			struct libscols_table *tb __attribute__((__unused__)),
+			struct libscols_line *start __attribute__((__unused__)),
+			struct libscols_line *end __attribute__((__unused__)),
+			char **data __attribute__((__unused__)))
+{
+	return -ENOSYS;
+}
+#endif
+
+static int do_print_table(struct libscols_table *tb, int *is_empty)
+{
+	int rc = 0;
+	struct ul_buffer buf = UL_INIT_BUFFER;
+
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "printing"));
+	if (is_empty)
+		*is_empty = 0;
+
+	if (list_empty(&tb->tb_columns)) {
+		DBG(TAB, ul_debugobj(tb, "error -- no columns"));
+		return -EINVAL;
+	}
+	if (list_empty(&tb->tb_lines)) {
+		DBG(TAB, ul_debugobj(tb, "ignore -- no lines"));
+		if (scols_table_is_json(tb)) {
+			ul_jsonwrt_init(&tb->json, tb->out, 0);
+			ul_jsonwrt_root_open(&tb->json);
+			ul_jsonwrt_array_open(&tb->json, tb->name ? tb->name : "");
+			ul_jsonwrt_array_close(&tb->json);
+			ul_jsonwrt_root_close(&tb->json);
+		} else if (is_empty)
+			*is_empty = 1;
+		return 0;
+	}
+
+	tb->header_printed = 0;
+	rc = __scols_initialize_printing(tb, &buf);
+	if (rc)
+		return rc;
+
+	if (scols_table_is_json(tb)) {
+		ul_jsonwrt_root_open(&tb->json);
+		ul_jsonwrt_array_open(&tb->json, tb->name ? tb->name : "");
+	}
+
+	if (tb->format == SCOLS_FMT_HUMAN)
+		__scols_print_title(tb);
+
+	rc = __scols_print_header(tb, &buf);
+	if (rc)
+		goto done;
+
+	if (scols_table_is_tree(tb))
+		rc = __scols_print_tree(tb, &buf);
+	else
+		rc = __scols_print_table(tb, &buf);
+
+	if (scols_table_is_json(tb)) {
+		ul_jsonwrt_array_close(&tb->json);
+		ul_jsonwrt_root_close(&tb->json);
+	}
+done:
+	__scols_cleanup_printing(tb, &buf);
+	return rc;
+}
+
+/**
+ * scols_print_table:
+ * @tb: table
+ *
+ * Prints the table to the output stream and terminate by \n.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_print_table(struct libscols_table *tb)
+{
+	int empty = 0;
+	int rc = do_print_table(tb, &empty);
+
+	if (rc == 0 && !empty && !scols_table_is_json(tb))
+		fputc('\n', tb->out);
+	return rc;
+}
+
+/**
+ * scols_print_table_to_string:
+ * @tb: table
+ * @data: pointer to the beginning of a memory area to print to
+ *
+ * Prints the table to @data.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+#ifdef HAVE_OPEN_MEMSTREAM
+int scols_print_table_to_string(struct libscols_table *tb, char **data)
+{
+	FILE *stream, *old_stream;
+	size_t sz;
+	int rc;
+
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "printing to string"));
+
+	/* create a stream for output */
+	stream = open_memstream(data, &sz);
+	if (!stream)
+		return -ENOMEM;
+
+	old_stream = scols_table_get_stream(tb);
+	scols_table_set_stream(tb, stream);
+	rc = do_print_table(tb, NULL);
+	fclose(stream);
+	scols_table_set_stream(tb, old_stream);
+
+	return rc;
+}
+#else
+int scols_print_table_to_string(
+		struct libscols_table *tb __attribute__((__unused__)),
+		char **data  __attribute__((__unused__)))
+{
+	return -ENOSYS;
+}
+#endif
diff --git a/libsmartcols/src/print.c b/libsmartcols/src/print.c
new file mode 100644
index 0000000..6a7e6da
--- /dev/null
+++ b/libsmartcols/src/print.c
@@ -0,0 +1,1243 @@
+ /* print.c - functions to print table
+ *
+ * Copyright (C) 2010-2014 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2016 Igor Gnatenko <i.gnatenko.brain@gmail.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * SECTION: table_print
+ * @title: Table print
+ * @short_description: output functions
+ *
+ * Table output API.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <termios.h>
+#include <ctype.h>
+
+#include "mbsalign.h"
+#include "carefulputc.h"
+#include "smartcolsP.h"
+
+/* Fallback for symbols
+ *
+ * Note that by default library define all the symbols, but in case user does
+ * not define all symbols or if we extended the symbols struct then we need
+ * fallback to be more robust and backwardly compatible.
+ */
+#define titlepadding_symbol(tb)	((tb)->symbols->title_padding ? (tb)->symbols->title_padding : " ")
+#define branch_symbol(tb)	((tb)->symbols->tree_branch ? (tb)->symbols->tree_branch : "|-")
+#define vertical_symbol(tb)	((tb)->symbols->tree_vert ? (tb)->symbols->tree_vert : "| ")
+#define right_symbol(tb)	((tb)->symbols->tree_right ? (tb)->symbols->tree_right : "`-")
+
+#define grp_vertical_symbol(tb)	((tb)->symbols->group_vert ? (tb)->symbols->group_vert : "|")
+#define grp_horizontal_symbol(tb) ((tb)->symbols->group_horz ? (tb)->symbols->group_horz : "-")
+#define grp_m_first_symbol(tb)	((tb)->symbols->group_first_member ? (tb)->symbols->group_first_member : ",->")
+#define grp_m_last_symbol(tb)	((tb)->symbols->group_last_member ? (tb)->symbols->group_last_member : "\\->")
+#define grp_m_middle_symbol(tb)	((tb)->symbols->group_middle_member ? (tb)->symbols->group_middle_member : "|->")
+#define grp_c_middle_symbol(tb)	((tb)->symbols->group_middle_child ? (tb)->symbols->group_middle_child : "|-")
+#define grp_c_last_symbol(tb)	((tb)->symbols->group_last_child ? (tb)->symbols->group_last_child : "`-")
+
+#define cellpadding_symbol(tb)  ((tb)->padding_debug ? "." : \
+				 ((tb)->symbols->cell_padding ? (tb)->symbols->cell_padding: " "))
+
+#define want_repeat_header(tb)	(!(tb)->header_repeat || (tb)->header_next <= (tb)->termlines_used)
+
+static int is_next_columns_empty(
+			struct libscols_table *tb,
+			struct libscols_column *cl,
+			struct libscols_line *ln)
+{
+	struct libscols_iter itr;
+
+	if (!tb || !cl)
+		return 0;
+	if (is_last_column(cl))
+		return 1;
+	if (!ln)
+		return 0;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	scols_table_set_columns_iter(tb, &itr, cl);
+
+	/* skip current column */
+	scols_table_next_column(tb, &itr, &cl);
+
+	while (scols_table_next_column(tb, &itr, &cl) == 0) {
+		struct libscols_cell *ce;
+		const char *data = NULL;
+
+                if (scols_column_is_hidden(cl))
+                        continue;
+		if (scols_column_is_tree(cl))
+			return 0;
+
+		ce = scols_line_get_cell(ln, cl->seqnum);
+		if (ce)
+			data = scols_cell_get_data(ce);
+		if (data && *data)
+			return 0;
+	}
+	return 1;
+}
+
+/* returns pointer to the end of used data */
+static int tree_ascii_art_to_buffer(struct libscols_table *tb,
+				    struct libscols_line *ln,
+				    struct ul_buffer *buf)
+{
+	const char *art;
+	int rc;
+
+	assert(ln);
+	assert(buf);
+
+	if (!ln->parent)
+		return 0;
+
+	rc = tree_ascii_art_to_buffer(tb, ln->parent, buf);
+	if (rc)
+		return rc;
+
+	if (is_last_child(ln))
+		art = "  ";
+	else
+		art = vertical_symbol(tb);
+
+	return ul_buffer_append_string(buf, art);
+}
+
+static int grpset_is_empty(	struct libscols_table *tb,
+				size_t idx,
+				size_t *rest)
+{
+	size_t i;
+
+	for (i = idx; i < tb->grpset_size; i++) {
+		if (tb->grpset[i] == NULL) {
+			if (rest)
+				(*rest)++;
+		} else
+			return 0;
+	}
+	return 1;
+}
+
+static int groups_ascii_art_to_buffer(	struct libscols_table *tb,
+				struct libscols_line *ln,
+				struct ul_buffer *buf,
+				int empty)
+{
+	int filled = 0;
+	size_t i, rest = 0;
+	const char *filler = cellpadding_symbol(tb);
+
+	if (!has_groups(tb))
+		return 0;
+
+	DBG(LINE, ul_debugobj(ln, "printing groups chart"));
+
+	if (tb->is_dummy_print)
+		return 0;		/* allocate grpset[] only */
+
+	for (i = 0; i < tb->grpset_size; i += SCOLS_GRPSET_CHUNKSIZ) {
+		struct libscols_group *gr = tb->grpset[i];
+
+		if (!gr) {
+			ul_buffer_append_ntimes(buf, SCOLS_GRPSET_CHUNKSIZ, cellpadding_symbol(tb));
+			continue;
+		}
+
+		/*
+		 * Empty cells (multi-line entries, etc.), print vertical symbols only
+		 * to show that the group continues.
+		 */
+		if (empty) {
+			switch (gr->state) {
+			case SCOLS_GSTATE_FIRST_MEMBER:
+			case SCOLS_GSTATE_MIDDLE_MEMBER:
+			case SCOLS_GSTATE_CONT_MEMBERS:
+				ul_buffer_append_string(buf, grp_vertical_symbol(tb));
+				ul_buffer_append_ntimes(buf, 2, filler);
+				break;
+
+			case SCOLS_GSTATE_LAST_MEMBER:
+			case SCOLS_GSTATE_MIDDLE_CHILD:
+			case SCOLS_GSTATE_CONT_CHILDREN:
+				ul_buffer_append_string(buf, filler);
+				ul_buffer_append_string(buf, grp_vertical_symbol(tb));
+				ul_buffer_append_string(buf, filler);
+				break;
+			case SCOLS_GSTATE_LAST_CHILD:
+				ul_buffer_append_ntimes(buf, 3, filler);
+				break;
+			}
+			continue;
+		}
+
+		/*
+		 * Regular cell
+		 */
+		switch (gr->state) {
+		case SCOLS_GSTATE_FIRST_MEMBER:
+			ul_buffer_append_string(buf, grp_m_first_symbol(tb));
+			break;
+		case SCOLS_GSTATE_MIDDLE_MEMBER:
+			ul_buffer_append_string(buf, grp_m_middle_symbol(tb));
+			break;
+		case SCOLS_GSTATE_LAST_MEMBER:
+			ul_buffer_append_string(buf, grp_m_last_symbol(tb));
+			break;
+		case SCOLS_GSTATE_CONT_MEMBERS:
+			ul_buffer_append_string(buf, grp_vertical_symbol(tb));
+			ul_buffer_append_ntimes(buf, 2, filler);
+			break;
+		case SCOLS_GSTATE_MIDDLE_CHILD:
+			ul_buffer_append_string(buf, filler);
+			ul_buffer_append_string(buf, grp_c_middle_symbol(tb));
+			if (grpset_is_empty(tb, i + SCOLS_GRPSET_CHUNKSIZ, &rest)) {
+				ul_buffer_append_ntimes(buf, rest+1, grp_horizontal_symbol(tb));
+				filled = 1;
+			}
+			filler = grp_horizontal_symbol(tb);
+			break;
+		case SCOLS_GSTATE_LAST_CHILD:
+			ul_buffer_append_string(buf, cellpadding_symbol(tb));
+			ul_buffer_append_string(buf, grp_c_last_symbol(tb));
+			if (grpset_is_empty(tb, i + SCOLS_GRPSET_CHUNKSIZ, &rest)) {
+				ul_buffer_append_ntimes(buf, rest+1, grp_horizontal_symbol(tb));
+				filled = 1;
+			}
+			filler = grp_horizontal_symbol(tb);
+			break;
+		case SCOLS_GSTATE_CONT_CHILDREN:
+			ul_buffer_append_string(buf, filler);
+			ul_buffer_append_string(buf, grp_vertical_symbol(tb));
+			ul_buffer_append_string(buf, filler);
+			break;
+		}
+
+		if (filled)
+			break;
+	}
+
+	if (!filled)
+		ul_buffer_append_string(buf, filler);
+	return 0;
+}
+
+static int has_pending_data(struct libscols_table *tb)
+{
+	struct libscols_column *cl;
+	struct libscols_iter itr;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0) {
+		if (scols_column_is_hidden(cl))
+			continue;
+		if (cl->pending_data)
+			return 1;
+	}
+	return 0;
+}
+
+static void fputs_color_reset(struct libscols_table *tb)
+{
+	if (tb->cur_color) {
+		fputs(UL_COLOR_RESET, tb->out);
+		tb->cur_color = NULL;
+	}
+}
+
+static void fputs_color(struct libscols_table *tb, const char *color)
+{
+	if (tb->cur_color)
+		fputs_color_reset(tb);
+
+	tb->cur_color = color;
+	if (color)
+		fputs(color, tb->out);
+}
+
+static const char *get_cell_color(struct libscols_table *tb,
+				struct libscols_column *cl,
+				struct libscols_line *ln,
+				struct libscols_cell *ce)
+{
+	const char *color = NULL;
+
+	if (!tb || !tb->colors_wanted || tb->format != SCOLS_FMT_HUMAN)
+		return NULL;
+	if (ce)
+		color = ce->color;
+	if (!color && (!ln || !ln->color) && cl)
+		color = cl->color;
+	return color;
+}
+
+/* switch from line color to cell/column color */
+static void fputs_color_cell_open(struct libscols_table *tb,
+				struct libscols_column *cl,
+				struct libscols_line *ln,
+				struct libscols_cell *ce)
+{
+	const char *color = get_cell_color(tb, cl, ln, ce);
+
+	if (color)
+		fputs_color(tb, color);
+}
+
+/* switch from cell/column color to line color or reset */
+static void fputs_color_cell_close(struct libscols_table *tb,
+				struct libscols_column *cl,
+				struct libscols_line *ln,
+				struct libscols_cell *ce)
+{
+	const char *color = get_cell_color(tb, cl, ln, ce);
+
+	if (color)
+		fputs_color(tb, ln ? ln->color : NULL);
+}
+
+/* switch to line color */
+static void fputs_color_line_open(struct libscols_table *tb,
+				struct libscols_line *ln)
+{
+	if (!tb || !tb->colors_wanted || tb->format != SCOLS_FMT_HUMAN)
+		return;
+	fputs_color(tb, ln ? ln->color : NULL);
+}
+
+/* switch off all colors */
+static void fputs_color_line_close(struct libscols_table *tb)
+{
+	if (!tb || !tb->colors_wanted || tb->format != SCOLS_FMT_HUMAN)
+		return;
+	fputs_color_reset(tb);
+}
+
+/* print padding or ASCII-art instead of data of @cl */
+static void print_empty_cell(struct libscols_table *tb,
+			  struct libscols_column *cl,
+			  struct libscols_line *ln,	/* optional */
+			  struct libscols_cell *ce,
+			  size_t bufsz)
+{
+	size_t len_pad = 0;		/* in screen cells as opposed to bytes */
+
+	DBG(COL, ul_debugobj(cl, " printing empty cell"));
+
+	fputs_color_cell_open(tb, cl, ln, ce);
+
+	/* generate tree/group ASCII-art rather than padding
+	 */
+	if (ln && scols_column_is_tree(cl)) {
+		struct ul_buffer art = UL_INIT_BUFFER;
+		char *data;
+
+		if (ul_buffer_alloc_data(&art, bufsz) != 0)
+			goto done;
+
+		if (cl->is_groups)
+			groups_ascii_art_to_buffer(tb, ln, &art, 1);
+
+		tree_ascii_art_to_buffer(tb, ln, &art);
+
+		if (!list_empty(&ln->ln_branch) && has_pending_data(tb))
+			ul_buffer_append_string(&art, vertical_symbol(tb));
+
+		if (scols_table_is_noencoding(tb))
+			data = ul_buffer_get_data(&art, NULL, &len_pad);
+		else
+			data = ul_buffer_get_safe_data(&art, NULL, &len_pad, NULL);
+
+		if (data && len_pad)
+			fputs(data, tb->out);
+		ul_buffer_free_data(&art);
+	}
+
+done:
+	/* minout -- don't fill */
+	if (scols_table_is_minout(tb) && is_next_columns_empty(tb, cl, ln)) {
+		fputs_color_cell_close(tb, cl, ln, ce);
+		return;
+	}
+
+	/* default -- fill except last column */
+	if (!scols_table_is_maxout(tb) && is_last_column(cl)) {
+		fputs_color_cell_close(tb, cl, ln, ce);
+		return;
+	}
+
+	/* fill rest of cell with space */
+	for(; len_pad < cl->width; ++len_pad)
+		fputs(cellpadding_symbol(tb), tb->out);
+
+	fputs_color_cell_close(tb, cl, ln, ce);
+
+	if (!is_last_column(cl))
+		fputs(colsep(tb), tb->out);
+}
+
+
+
+/* Fill the start of a line with padding (or with tree ascii-art).
+ *
+ * This is necessary after a long non-truncated column, as this requires the
+ * next column to be printed on the next line. For example (see 'DDD'):
+ *
+ * aaa bbb ccc ddd eee
+ * AAA BBB CCCCCCC
+ *             DDD EEE
+ * ^^^^^^^^^^^^
+ *  new line padding
+ */
+static void print_newline_padding(struct libscols_table *tb,
+				  struct libscols_column *cl,
+				  struct libscols_line *ln,	/* optional */
+				  struct libscols_cell *ce,
+				  size_t bufsz)
+{
+	size_t i;
+
+	assert(tb);
+	assert(cl);
+
+	DBG(LINE, ul_debugobj(ln, "printing newline padding"));
+
+	fputs(linesep(tb), tb->out);		/* line break */
+	tb->termlines_used++;
+
+	fputs_color_line_open(tb, ln);
+
+	/* fill cells after line break */
+	for (i = 0; i <= (size_t) cl->seqnum; i++)
+		print_empty_cell(tb, scols_table_get_column(tb, i), ln, ce, bufsz);
+
+	fputs_color_line_close(tb);
+}
+
+/*
+ * Pending data
+ *
+ * The first line in the multi-line cells (columns with SCOLS_FL_WRAP flag) is
+ * printed as usually and output is truncated to match column width.
+ *
+ * The rest of the long text is printed on next extra line(s). The extra lines
+ * don't exist in the table (not represented by libscols_line). The data for
+ * the extra lines are stored in libscols_column->pending_data_buf and the
+ * function print_line() adds extra lines until the buffer is not empty in all
+ * columns.
+ */
+
+/* set data that will be printed by extra lines */
+static int set_pending_data(struct libscols_column *cl, const char *data, size_t sz)
+{
+	char *p = NULL;
+
+	if (data && *data) {
+		DBG(COL, ul_debugobj(cl, "setting pending data"));
+		assert(sz);
+		p = strdup(data);
+		if (!p)
+			return -ENOMEM;
+	}
+
+	free(cl->pending_data_buf);
+	cl->pending_data_buf = p;
+	cl->pending_data_sz = sz;
+	cl->pending_data = cl->pending_data_buf;
+	return 0;
+}
+
+/* the next extra line has been printed, move pending data cursor */
+static int step_pending_data(struct libscols_column *cl, size_t bytes)
+{
+	DBG(COL, ul_debugobj(cl, "step pending data %zu -= %zu", cl->pending_data_sz, bytes));
+
+	if (bytes >= cl->pending_data_sz)
+		return set_pending_data(cl, NULL, 0);
+
+	cl->pending_data += bytes;
+	cl->pending_data_sz -= bytes;
+	return 0;
+}
+
+/* print next pending data for the column @cl */
+static int print_pending_data(
+		struct libscols_table *tb,
+		struct libscols_column *cl,
+		struct libscols_line *ln,	/* optional */
+		struct libscols_cell *ce)
+{
+	size_t width = cl->width, bytes;
+	size_t len = width, i;
+	char *data;
+	char *nextchunk = NULL;
+
+	if (!cl->pending_data)
+		return 0;
+	if (!width)
+		return -EINVAL;
+
+	DBG(COL, ul_debugobj(cl, "printing pending data"));
+
+	data = strdup(cl->pending_data);
+	if (!data)
+		goto err;
+
+	if (scols_column_is_customwrap(cl)
+	    && (nextchunk = cl->wrap_nextchunk(cl, data, cl->wrapfunc_data))) {
+		bytes = nextchunk - data;
+
+		len = scols_table_is_noencoding(tb) ?
+				mbs_nwidth(data, bytes) :
+				mbs_safe_nwidth(data, bytes, NULL);
+	} else
+		bytes = mbs_truncate(data, &len);
+
+	if (bytes == (size_t) -1)
+		goto err;
+
+	if (bytes)
+		step_pending_data(cl, bytes);
+
+	fputs_color_cell_open(tb, cl, ln, ce);
+
+	fputs(data, tb->out);
+	free(data);
+
+	/* minout -- don't fill */
+	if (scols_table_is_minout(tb) && is_next_columns_empty(tb, cl, ln)) {
+		fputs_color_cell_close(tb, cl, ln, ce);
+		return 0;
+	}
+
+	/* default -- fill except last column */
+	if (!scols_table_is_maxout(tb) && is_last_column(cl)) {
+		fputs_color_cell_close(tb, cl, ln, ce);
+		return 0;
+	}
+
+	/* fill rest of cell with space */
+	for(i = len; i < width; i++)
+		fputs(cellpadding_symbol(tb), tb->out);
+
+	fputs_color_cell_close(tb, cl, ln, ce);
+
+	if (!is_last_column(cl))
+		fputs(colsep(tb), tb->out);
+
+	return 0;
+err:
+	free(data);
+	return -errno;
+}
+
+static void print_json_data(struct libscols_table *tb,
+			    struct libscols_column *cl,
+			    const char *name,
+			    char *data)
+{
+	switch (cl->json_type) {
+	case SCOLS_JSON_STRING:
+		/* name: "aaa" */
+		ul_jsonwrt_value_s(&tb->json, name, data);
+		break;
+	case SCOLS_JSON_NUMBER:
+		/* name: 123 */
+		ul_jsonwrt_value_raw(&tb->json, name, data);
+		break;
+	case SCOLS_JSON_BOOLEAN:
+	case SCOLS_JSON_BOOLEAN_OPTIONAL:
+		/* name: true|false|null */
+		if (cl->json_type == SCOLS_JSON_BOOLEAN_OPTIONAL && (!*data || !strcmp(data, "-"))) {
+			ul_jsonwrt_value_null(&tb->json, name);
+		} else {
+			ul_jsonwrt_value_boolean(&tb->json, name,
+					!*data ? 0 :
+					*data == '0' ? 0 :
+					*data == 'N' || *data == 'n' ? 0 : 1);
+		}
+		break;
+	case SCOLS_JSON_ARRAY_STRING:
+	case SCOLS_JSON_ARRAY_NUMBER:
+		/* name: [ "aaa", "bbb", "ccc" ] */
+		ul_jsonwrt_array_open(&tb->json, name);
+
+		if (!scols_column_is_customwrap(cl))
+			ul_jsonwrt_value_s(&tb->json, NULL, data);
+		else do {
+				char *next = cl->wrap_nextchunk(cl, data, cl->wrapfunc_data);
+
+				if (cl->json_type == SCOLS_JSON_ARRAY_STRING)
+					ul_jsonwrt_value_s(&tb->json, NULL, data);
+				else
+					ul_jsonwrt_value_raw(&tb->json, NULL, data);
+				data = next;
+		} while (data);
+
+		ul_jsonwrt_array_close(&tb->json);
+		break;
+	}
+}
+
+static int print_data(struct libscols_table *tb,
+		      struct libscols_column *cl,
+		      struct libscols_line *ln,	/* optional */
+		      struct libscols_cell *ce,	/* optional */
+		      struct ul_buffer *buf)
+{
+	size_t len = 0, i, width, bytes;
+	char *data, *nextchunk;
+	const char *name = NULL;
+	int is_last;
+
+	assert(tb);
+	assert(cl);
+
+	data = ul_buffer_get_data(buf, NULL, NULL);
+	if (!data)
+		data = "";
+
+	if (tb->format != SCOLS_FMT_HUMAN) {
+		name = scols_table_is_shellvar(tb) ?
+				scols_column_get_name_as_shellvar(cl) :
+				scols_column_get_name(cl);
+	}
+
+	is_last = is_last_column(cl);
+
+	if (is_last && scols_table_is_json(tb) &&
+	    scols_table_is_tree(tb) && has_children(ln))
+		/* "children": [] is the real last value */
+		is_last = 0;
+
+	switch (tb->format) {
+	case SCOLS_FMT_RAW:
+		fputs_nonblank(data, tb->out);
+		if (!is_last)
+			fputs(colsep(tb), tb->out);
+		return 0;
+
+	case SCOLS_FMT_EXPORT:
+		fputs(name ?: "", tb->out);
+		fputc('=', tb->out);
+		fputs_quoted(data, tb->out);
+		if (!is_last)
+			fputs(colsep(tb), tb->out);
+		return 0;
+
+	case SCOLS_FMT_JSON:
+		print_json_data(tb, cl, name, data);
+		return 0;
+
+	case SCOLS_FMT_HUMAN:
+		break;		/* continue below */
+	}
+
+	/* Encode. Note that 'len' and 'width' are number of cells, not bytes.
+	 */
+	if (scols_table_is_noencoding(tb))
+		data = ul_buffer_get_data(buf, &bytes, &len);
+	else
+		data = ul_buffer_get_safe_data(buf, &bytes, &len, scols_column_get_safechars(cl));
+
+	if (!data)
+		data = "";
+	width = cl->width;
+
+	/* custom multi-line cell based */
+	if (*data && scols_column_is_customwrap(cl)
+	    && (nextchunk = cl->wrap_nextchunk(cl, data, cl->wrapfunc_data))) {
+		set_pending_data(cl, nextchunk, bytes - (nextchunk - data));
+		bytes = nextchunk - data;
+
+		len = scols_table_is_noencoding(tb) ?
+				mbs_nwidth(data, bytes) :
+				mbs_safe_nwidth(data, bytes, NULL);
+	}
+
+	if (is_last
+	    && len < width
+	    && !scols_table_is_maxout(tb)
+	    && !scols_column_is_right(cl))
+		width = len;
+
+	/* truncate data */
+	if (len > width && scols_column_is_trunc(cl)) {
+		len = width;
+		bytes = mbs_truncate(data, &len);	/* updates 'len' */
+	}
+
+	/* standard multi-line cell */
+	if (len > width && scols_column_is_wrap(cl)
+	    && !scols_column_is_customwrap(cl)) {
+		set_pending_data(cl, data, bytes);
+
+		len = width;
+		bytes = mbs_truncate(data, &len);
+		if (bytes  != (size_t) -1 && bytes > 0)
+			step_pending_data(cl, bytes);
+	}
+
+	if (bytes == (size_t) -1) {
+		bytes = len = 0;
+		data = NULL;
+	}
+
+	fputs_color_cell_open(tb, cl, ln, ce);
+
+	if (data && *data) {
+		if (scols_column_is_right(cl)) {
+			for (i = len; i < width; i++)
+				fputs(cellpadding_symbol(tb), tb->out);
+			len = width;
+		}
+		fputs(data, tb->out);
+
+	}
+
+	/* minout -- don't fill */
+	if (scols_table_is_minout(tb) && is_next_columns_empty(tb, cl, ln)) {
+		fputs_color_cell_close(tb, cl, ln, ce);
+		return 0;
+	}
+
+	/* default -- fill except last column */
+	if (!scols_table_is_maxout(tb) && is_last) {
+		fputs_color_cell_close(tb, cl, ln, ce);
+		return 0;
+	}
+
+	/* fill rest of cell with space */
+	for(i = len; i < width; i++)
+		fputs(cellpadding_symbol(tb), tb->out);
+
+	fputs_color_cell_close(tb, cl, ln, ce);
+
+	if (len > width && !scols_column_is_trunc(cl)) {
+		DBG(COL, ul_debugobj(cl, "*** data len=%zu > column width=%zu", len, width));
+		print_newline_padding(tb, cl, ln, ce, ul_buffer_get_bufsiz(buf));	/* next column starts on next line */
+
+	} else if (!is_last)
+		fputs(colsep(tb), tb->out);		/* columns separator */
+
+	return 0;
+}
+
+int __cell_to_buffer(struct libscols_table *tb,
+			  struct libscols_line *ln,
+			  struct libscols_column *cl,
+			  struct ul_buffer *buf)
+{
+	const char *data;
+	struct libscols_cell *ce;
+	int rc = 0;
+
+	assert(tb);
+	assert(ln);
+	assert(cl);
+	assert(buf);
+	assert(cl->seqnum <= tb->ncols);
+
+	ul_buffer_reset_data(buf);
+
+	ce = scols_line_get_cell(ln, cl->seqnum);
+	data = ce ? scols_cell_get_data(ce) : NULL;
+
+	if (!scols_column_is_tree(cl))
+		return data ? ul_buffer_append_string(buf, data) : 0;
+
+	/*
+	 * Group stuff
+	 */
+	if (!scols_table_is_json(tb) && cl->is_groups)
+		rc = groups_ascii_art_to_buffer(tb, ln, buf, 0);
+
+	/*
+	 * Tree stuff
+	 */
+	if (!rc && ln->parent && !scols_table_is_json(tb)) {
+		rc = tree_ascii_art_to_buffer(tb, ln->parent, buf);
+
+		if (!rc && is_last_child(ln))
+			rc = ul_buffer_append_string(buf, right_symbol(tb));
+		else if (!rc)
+			rc = ul_buffer_append_string(buf, branch_symbol(tb));
+	}
+
+	if (!rc && (ln->parent || cl->is_groups) && !scols_table_is_json(tb))
+		ul_buffer_save_pointer(buf, SCOLS_BUFPTR_TREEEND);
+
+	if (!rc && data)
+		rc = ul_buffer_append_string(buf, data);
+	return rc;
+}
+
+/*
+ * Prints data. Data can be printed in more formats (raw, NAME=xxx pairs), and
+ * control and non-printable characters can be encoded in the \x?? encoding.
+ */
+static int print_line(struct libscols_table *tb,
+		      struct libscols_line *ln,
+		      struct ul_buffer *buf)
+{
+	int rc = 0, pending = 0;
+	struct libscols_column *cl;
+	struct libscols_iter itr;
+
+	assert(ln);
+
+	DBG(LINE, ul_debugobj(ln, "     printing line"));
+
+	fputs_color_line_open(tb, ln);
+
+	/* regular line */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (rc == 0 && scols_table_next_column(tb, &itr, &cl) == 0) {
+		if (scols_column_is_hidden(cl))
+			continue;
+		rc = __cell_to_buffer(tb, ln, cl, buf);
+		if (rc == 0)
+			rc = print_data(tb, cl, ln,
+					scols_line_get_cell(ln, cl->seqnum),
+					buf);
+		if (rc == 0 && cl->pending_data)
+			pending = 1;
+	}
+	fputs_color_line_close(tb);
+
+	/* extra lines of the multi-line cells */
+	while (rc == 0 && pending) {
+		DBG(LINE, ul_debugobj(ln, "printing pending data"));
+		pending = 0;
+		fputs(linesep(tb), tb->out);
+		fputs_color_line_open(tb, ln);
+		tb->termlines_used++;
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (rc == 0 && scols_table_next_column(tb, &itr, &cl) == 0) {
+			if (scols_column_is_hidden(cl))
+				continue;
+			if (cl->pending_data) {
+				rc = print_pending_data(tb, cl, ln, scols_line_get_cell(ln, cl->seqnum));
+				if (rc == 0 && cl->pending_data)
+					pending = 1;
+			} else
+				print_empty_cell(tb, cl, ln, NULL, ul_buffer_get_bufsiz(buf));
+		}
+		fputs_color_line_close(tb);
+	}
+
+	return 0;
+}
+
+int __scols_print_title(struct libscols_table *tb)
+{
+	int rc;
+	mbs_align_t align;
+	size_t width, len = 0, bufsz, titlesz;
+	char *title = NULL, *buf = NULL;
+
+	assert(tb);
+
+	if (!tb->title.data)
+		return 0;
+
+	DBG(TAB, ul_debugobj(tb, "printing title"));
+
+	/* encode data */
+	if (tb->no_encode) {
+		len = bufsz = strlen(tb->title.data) + 1;
+		buf = strdup(tb->title.data);
+		if (!buf) {
+			rc = -ENOMEM;
+			goto done;
+		}
+	} else {
+		bufsz = mbs_safe_encode_size(strlen(tb->title.data)) + 1;
+		if (bufsz == 1) {
+			DBG(TAB, ul_debugobj(tb, "title is empty string -- ignore"));
+			return 0;
+		}
+		buf = malloc(bufsz);
+		if (!buf) {
+			rc = -ENOMEM;
+			goto done;
+		}
+
+		if (!mbs_safe_encode_to_buffer(tb->title.data, &len, buf, NULL) ||
+		    !len || len == (size_t) -1) {
+			rc = -EINVAL;
+			goto done;
+		}
+	}
+
+	/* truncate and align */
+	width = tb->is_term ? tb->termwidth : 80;
+	titlesz = width + bufsz;
+
+	title = malloc(titlesz);
+	if (!title) {
+		rc = -EINVAL;
+		goto done;
+	}
+
+	switch (scols_cell_get_alignment(&tb->title)) {
+	case SCOLS_CELL_FL_RIGHT:
+		align = MBS_ALIGN_RIGHT;
+		break;
+	case SCOLS_CELL_FL_CENTER:
+		align = MBS_ALIGN_CENTER;
+		break;
+	case SCOLS_CELL_FL_LEFT:
+	default:
+		align = MBS_ALIGN_LEFT;
+		/*
+		 * Don't print extra blank chars after the title if on left
+		 * (that's same as we use for the last column in the table).
+		 */
+		if (len < width
+		    && !scols_table_is_maxout(tb)
+		    && isblank(*titlepadding_symbol(tb)))
+			width = len;
+		break;
+
+	}
+
+	/* copy from buf to title and align to width with title_padding */
+	rc = mbsalign_with_padding(buf, title, titlesz,
+			&width, align,
+			0, (int) *titlepadding_symbol(tb));
+
+	if (rc == -1) {
+		rc = -EINVAL;
+		goto done;
+	}
+
+
+	if (tb->colors_wanted)
+		fputs_color(tb, tb->title.color);
+
+	fputs(title, tb->out);
+
+	if (tb->colors_wanted)
+		fputs_color_reset(tb);
+
+	fputc('\n', tb->out);
+	rc = 0;
+done:
+	free(buf);
+	free(title);
+	DBG(TAB, ul_debugobj(tb, "printing title done [rc=%d]", rc));
+	return rc;
+}
+
+int __scols_print_header(struct libscols_table *tb, struct ul_buffer *buf)
+{
+	int rc = 0;
+	struct libscols_column *cl;
+	struct libscols_iter itr;
+
+	assert(tb);
+
+	if ((tb->header_printed == 1 && tb->header_repeat == 0) ||
+	    scols_table_is_noheadings(tb) ||
+	    scols_table_is_export(tb) ||
+	    scols_table_is_json(tb) ||
+	    list_empty(&tb->tb_lines))
+		return 0;
+
+	DBG(TAB, ul_debugobj(tb, "printing header"));
+
+	/* set the width according to the size of the data */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (rc == 0 && scols_table_next_column(tb, &itr, &cl) == 0) {
+		if (scols_column_is_hidden(cl))
+			continue;
+
+		ul_buffer_reset_data(buf);
+
+		if (cl->is_groups
+		    && scols_table_is_tree(tb) && scols_column_is_tree(cl)) {
+			size_t i;
+			for (i = 0; i < tb->grpset_size + 1; i++) {
+				rc = ul_buffer_append_data(buf, " ", 1);
+				if (rc)
+					break;
+			}
+		}
+		if (!rc)
+			rc = ul_buffer_append_string(buf,
+					scols_table_is_shellvar(tb) ?
+						scols_column_get_name_as_shellvar(cl) :
+						scols_column_get_name(cl));
+		if (!rc)
+			rc = print_data(tb, cl, NULL, &cl->header, buf);
+	}
+
+	if (rc == 0) {
+		fputs(linesep(tb), tb->out);
+		tb->termlines_used++;
+	}
+
+	tb->header_printed = 1;
+	tb->header_next = tb->termlines_used + tb->termheight;
+	if (tb->header_repeat)
+		DBG(TAB, ul_debugobj(tb, "\tnext header: %zu [current=%zu, rc=%d]",
+					tb->header_next, tb->termlines_used, rc));
+	return rc;
+}
+
+
+int __scols_print_range(struct libscols_table *tb,
+			struct ul_buffer *buf,
+			struct libscols_iter *itr,
+			struct libscols_line *end)
+{
+	int rc = 0;
+	struct libscols_line *ln;
+
+	assert(tb);
+	DBG(TAB, ul_debugobj(tb, "printing range"));
+
+	while (rc == 0 && scols_table_next_line(tb, itr, &ln) == 0) {
+
+		int last = scols_iter_is_last(itr);
+
+		if (scols_table_is_json(tb))
+			ul_jsonwrt_object_open(&tb->json, NULL);
+
+		rc = print_line(tb, ln, buf);
+
+		if (scols_table_is_json(tb))
+			ul_jsonwrt_object_close(&tb->json);
+		else if (last == 0 && tb->no_linesep == 0) {
+			fputs(linesep(tb), tb->out);
+			tb->termlines_used++;
+		}
+
+		if (end && ln == end)
+			break;
+
+		if (!last && want_repeat_header(tb))
+			__scols_print_header(tb, buf);
+	}
+
+	return rc;
+
+}
+
+int __scols_print_table(struct libscols_table *tb, struct ul_buffer *buf)
+{
+	struct libscols_iter itr;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	return __scols_print_range(tb, buf, &itr, NULL);
+}
+
+/* scols_walk_tree() callback to print tree line */
+static int print_tree_line(struct libscols_table *tb,
+			   struct libscols_line *ln,
+			   struct libscols_column *cl __attribute__((__unused__)),
+			   void *data)
+{
+	struct ul_buffer *buf = (struct ul_buffer *) data;
+	int rc;
+
+	DBG(LINE, ul_debugobj(ln, "   printing tree line"));
+
+	if (scols_table_is_json(tb))
+		ul_jsonwrt_object_open(&tb->json, NULL);
+
+	rc = print_line(tb, ln, buf);
+	if (rc)
+		return rc;
+
+	if (has_children(ln)) {
+		if (scols_table_is_json(tb))
+			ul_jsonwrt_array_open(&tb->json, "children");
+		else {
+			/* between parent and child is separator */
+			fputs(linesep(tb), tb->out);
+			tb->termlines_used++;
+		}
+	} else {
+		int last;
+
+		/* terminate all open last children for JSON */
+		if (scols_table_is_json(tb)) {
+			do {
+				last = (is_child(ln) && is_last_child(ln)) ||
+				       (is_tree_root(ln) && is_last_tree_root(tb, ln));
+
+				ul_jsonwrt_object_close(&tb->json);
+				if (last && is_child(ln))
+					ul_jsonwrt_array_close(&tb->json);
+				ln = ln->parent;
+			} while(ln && last);
+
+		} else if (tb->no_linesep == 0) {
+			int last_in_tree = scols_walk_is_last(tb, ln);
+
+			if (last_in_tree == 0) {
+				/* standard output */
+				fputs(linesep(tb), tb->out);
+				tb->termlines_used++;
+			}
+		}
+	}
+
+	return 0;
+}
+
+int __scols_print_tree(struct libscols_table *tb, struct ul_buffer *buf)
+{
+	assert(tb);
+	DBG(TAB, ul_debugobj(tb, "----printing-tree-----"));
+
+	return scols_walk_tree(tb, NULL, print_tree_line, (void *) buf);
+}
+
+static size_t strlen_line(struct libscols_line *ln)
+{
+	size_t i, sz = 0;
+
+	assert(ln);
+
+	for (i = 0; i < ln->ncells; i++) {
+		struct libscols_cell *ce = scols_line_get_cell(ln, i);
+		const char *data = ce ? scols_cell_get_data(ce) : NULL;
+
+		sz += data ? strlen(data) : 0;
+	}
+
+	return sz;
+}
+
+void __scols_cleanup_printing(struct libscols_table *tb, struct ul_buffer *buf)
+{
+	if (!tb)
+		return;
+
+	ul_buffer_free_data(buf);
+
+	if (tb->priv_symbols) {
+		scols_table_set_symbols(tb, NULL);
+		tb->priv_symbols = 0;
+	}
+}
+
+int __scols_initialize_printing(struct libscols_table *tb, struct ul_buffer *buf)
+{
+	size_t bufsz, extra_bufsz = 0;
+	struct libscols_line *ln;
+	struct libscols_iter itr;
+	int rc;
+
+	DBG(TAB, ul_debugobj(tb, "initialize printing"));
+
+	if (!tb->symbols) {
+		rc = scols_table_set_default_symbols(tb);
+		if (rc)
+			goto err;
+		tb->priv_symbols = 1;
+	} else
+		tb->priv_symbols = 0;
+
+	if (tb->format == SCOLS_FMT_HUMAN)
+		tb->is_term = tb->termforce == SCOLS_TERMFORCE_NEVER  ? 0 :
+			      tb->termforce == SCOLS_TERMFORCE_ALWAYS ? 1 :
+			      isatty(STDOUT_FILENO);
+
+	if (tb->is_term) {
+		size_t width = (size_t) scols_table_get_termwidth(tb);
+
+		if (tb->termreduce > 0 && tb->termreduce < width) {
+			width -= tb->termreduce;
+			scols_table_set_termwidth(tb, width);
+		}
+		bufsz = width;
+	} else
+		bufsz = BUFSIZ;
+
+	if (!tb->is_term || tb->format != SCOLS_FMT_HUMAN || scols_table_is_tree(tb))
+		tb->header_repeat = 0;
+
+	/*
+	 * Estimate extra space necessary for tree, JSON or another output
+	 * decoration.
+	 */
+	if (scols_table_is_tree(tb))
+		extra_bufsz += tb->nlines * strlen(vertical_symbol(tb));
+
+	switch (tb->format) {
+	case SCOLS_FMT_RAW:
+		extra_bufsz += tb->ncols;			/* separator between columns */
+		break;
+	case SCOLS_FMT_JSON:
+		ul_jsonwrt_init(&tb->json, tb->out, 0);
+		extra_bufsz += tb->nlines * 3;		/* indentation */
+		/* fallthrough */
+	case SCOLS_FMT_EXPORT:
+	{
+		struct libscols_column *cl;
+
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+
+		while (scols_table_next_column(tb, &itr, &cl) == 0) {
+			if (scols_column_is_hidden(cl))
+				continue;
+
+			if (scols_column_get_name(cl))
+				extra_bufsz += strlen(scols_column_get_name(cl));	/* data */
+			extra_bufsz += 2;						/* separators */
+		}
+		break;
+	}
+	case SCOLS_FMT_HUMAN:
+		break;
+	}
+
+	/*
+	 * Enlarge buffer if necessary, the buffer should be large enough to
+	 * store line data and tree ascii art (or another decoration).
+	 */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_line(tb, &itr, &ln) == 0) {
+		size_t sz;
+
+		sz = strlen_line(ln) + extra_bufsz;
+		if (sz > bufsz)
+			bufsz = sz;
+	}
+
+	/* pre-allocate space for data */
+	rc = ul_buffer_alloc_data(buf, bufsz + 1);	/* data + space for \0 */
+	if (rc)
+		goto err;
+
+	/*
+	 * Make sure groups members are in the same orders as the tree
+	 */
+	if (has_groups(tb) && scols_table_is_tree(tb))
+		scols_groups_fix_members_order(tb);
+
+	if (tb->format == SCOLS_FMT_HUMAN) {
+		rc = __scols_calculate(tb, buf);
+		if (rc != 0)
+			goto err;
+	}
+
+	return 0;
+err:
+	__scols_cleanup_printing(tb, buf);
+	return rc;
+}
+
diff --git a/libsmartcols/src/smartcolsP.h b/libsmartcols/src/smartcolsP.h
new file mode 100644
index 0000000..8a7ee9b
--- /dev/null
+++ b/libsmartcols/src/smartcolsP.h
@@ -0,0 +1,455 @@
+/*
+ * smartcolsP.h - private library header file
+ *
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+#ifndef _LIBSMARTCOLS_PRIVATE_H
+#define _LIBSMARTCOLS_PRIVATE_H
+
+#include "c.h"
+#include "list.h"
+#include "strutils.h"
+#include "color-names.h"
+#include "jsonwrt.h"
+#include "debug.h"
+#include "buffer.h"
+
+#include "libsmartcols.h"
+
+/*
+ * Debug
+ */
+#define SCOLS_DEBUG_HELP	(1 << 0)
+#define SCOLS_DEBUG_INIT	(1 << 1)
+#define SCOLS_DEBUG_CELL	(1 << 2)
+#define SCOLS_DEBUG_LINE	(1 << 3)
+#define SCOLS_DEBUG_TAB		(1 << 4)
+#define SCOLS_DEBUG_COL		(1 << 5)
+#define SCOLS_DEBUG_BUFF	(1 << 6)
+#define SCOLS_DEBUG_GROUP	(1 << 7)
+#define SCOLS_DEBUG_ALL		0xFFFF
+
+UL_DEBUG_DECLARE_MASK(libsmartcols);
+#define DBG(m, x)	__UL_DBG(libsmartcols, SCOLS_DEBUG_, m, x)
+#define ON_DBG(m, x)	__UL_DBG_CALL(libsmartcols, SCOLS_DEBUG_, m, x)
+#define DBG_FLUSH	__UL_DBG_FLUSH(libsmartcols, SCOLS_DEBUG_)
+
+#define UL_DEBUG_CURRENT_MASK	UL_DEBUG_MASK(libsmartcols)
+#include "debugobj.h"
+
+#define SCOLS_BUFPTR_TREEEND	0
+
+/*
+ * Generic iterator
+ */
+struct libscols_iter {
+	struct list_head        *p;		/* current position */
+	struct list_head        *head;		/* start position */
+	int			direction;	/* SCOLS_ITER_{FOR,BACK}WARD */
+};
+
+/*
+ * Tree symbols
+ */
+struct libscols_symbols {
+	int	refcount;
+
+	char	*tree_branch;
+	char	*tree_vert;
+	char	*tree_right;
+
+	char	*group_vert;
+	char	*group_horz;
+	char    *group_first_member;
+	char	*group_last_member;
+	char	*group_middle_member;
+	char	*group_last_child;
+	char	*group_middle_child;
+
+	char	*title_padding;
+	char	*cell_padding;
+};
+
+/*
+ * Table cells
+ */
+struct libscols_cell {
+	char	*data;
+	char	*color;
+	void    *userdata;
+	int	flags;
+	size_t	width;
+};
+
+extern int scols_line_move_cells(struct libscols_line *ln, size_t newn, size_t oldn);
+
+struct libscols_wstat {
+	size_t	width_min;
+	size_t	width_max;
+	double	width_avg;
+	double  width_sqr_sum;
+	double  width_deviation;
+
+	size_t  width_treeart;
+};
+
+/*
+ * Table column
+ */
+struct libscols_column {
+	int	refcount;	/* reference counter */
+	size_t	seqnum;		/* column index */
+
+	size_t	width;		/* expected column width */
+	size_t  width_treeart;
+	double	width_hint;	/* hint (N < 1 is in percent of termwidth) */
+
+	struct libscols_wstat wstat;	/* private __scols_calculate() data */
+
+	int	json_type;	/* SCOLS_JSON_* */
+
+	int	flags;
+	char	*color;		/* default column color */
+	char	*safechars;	/* do not encode this bytes */
+
+	char	*pending_data;
+	size_t	pending_data_sz;
+	char	*pending_data_buf;
+
+	int (*cmpfunc)(struct libscols_cell *,
+		       struct libscols_cell *,
+		       void *);			/* cells comparison function */
+	void *cmpfunc_data;
+
+	size_t (*wrap_chunksize)(const struct libscols_column *,
+			const char *, void *);
+	char *(*wrap_nextchunk)(const struct libscols_column *,
+			char *, void *);
+	void *wrapfunc_data;
+
+
+	struct libscols_cell	header;		/* column name with color etc. */
+	char	*shellvar;			/* raw colum name in shell compatible format */
+
+	struct list_head	cl_columns;	/* member of table->tb_columns */
+
+	struct libscols_table	*table;
+
+	unsigned int	is_groups  : 1;		/* print group chart */
+
+};
+
+#define colsep(tb)	((tb)->colsep ? (tb)->colsep : " ")
+#define linesep(tb)	((tb)->linesep ? (tb)->linesep : "\n")
+
+enum {
+	SCOLS_GSTATE_NONE = 0,		/* not activate yet */
+	SCOLS_GSTATE_FIRST_MEMBER,
+	SCOLS_GSTATE_MIDDLE_MEMBER,
+	SCOLS_GSTATE_LAST_MEMBER,
+	SCOLS_GSTATE_MIDDLE_CHILD,
+	SCOLS_GSTATE_LAST_CHILD,
+	SCOLS_GSTATE_CONT_MEMBERS,
+	SCOLS_GSTATE_CONT_CHILDREN
+};
+
+/*
+ * Every group needs at least 3 columns
+ */
+#define SCOLS_GRPSET_CHUNKSIZ	3
+
+struct libscols_group {
+	int     refcount;
+
+	size_t  nmembers;
+
+	struct list_head gr_members;	/* head of line->ln_group */
+	struct list_head gr_children;	/* head of line->ln_children */
+	struct list_head gr_groups;	/* member of table->tb_groups */
+
+	int	state;			/* SCOLS_GSTATE_* */
+};
+
+/*
+ * Table line
+ */
+struct libscols_line {
+	int	refcount;
+	size_t	seqnum;
+
+	void	*userdata;
+	char	*color;		/* default line color */
+
+	struct libscols_cell	*cells;		/* array with data */
+	size_t			ncells;		/* number of cells */
+
+	struct list_head	ln_lines;	/* member of table->tb_lines */
+	struct list_head	ln_branch;	/* head of line->ln_children */
+	struct list_head	ln_children;	/* member of line->ln_children or group->gr_children */
+	struct list_head	ln_groups;	/* member of group->gr_groups */
+
+	struct libscols_line	*parent;
+	struct libscols_group	*parent_group;	/* for group childs */
+	struct libscols_group	*group;		/* for group members */
+};
+
+enum {
+	SCOLS_FMT_HUMAN = 0,		/* default, human readable */
+	SCOLS_FMT_RAW,			/* space separated */
+	SCOLS_FMT_EXPORT,		/* COLNAME="data" ... */
+	SCOLS_FMT_JSON			/* http://en.wikipedia.org/wiki/JSON */
+};
+
+/*
+ * The table
+ */
+struct libscols_table {
+	int	refcount;
+	char	*name;		/* optional table name (for JSON) */
+	size_t	ncols;		/* number of columns */
+	size_t  ntreecols;	/* number of columns with SCOLS_FL_TREE */
+	size_t	nlines;		/* number of lines */
+	size_t	termwidth;	/* terminal width (number of columns) */
+	size_t  termheight;	/* terminal height  (number of lines) */
+	size_t  termreduce;	/* extra blank space */
+	int	termforce;	/* SCOLS_TERMFORCE_* */
+	FILE	*out;		/* output stream */
+
+	char	*colsep;	/* column separator */
+	char	*linesep;	/* line separator */
+
+	struct list_head	tb_columns;	/* list of columns, items: column->cl_columns */
+	struct list_head	tb_lines;	/* list of lines; items: line->ln_lines  */
+
+	struct list_head	tb_groups;	/* all defined groups */
+	struct libscols_group	**grpset;
+	size_t			grpset_size;
+
+	size_t			ngrpchlds_pending;	/* groups with not yet printed children */
+	struct libscols_line	*walk_last_tree_root;	/* last root, used by scols_walk_() */
+
+	struct libscols_column	*dflt_sort_column;	/* default sort column, set by scols_sort_table() */
+
+	struct libscols_symbols	*symbols;
+	struct libscols_cell	title;		/* optional table title (for humans) */
+
+	struct ul_jsonwrt	json;		/* JSON formatting */
+
+	int	format;		/* SCOLS_FMT_* */
+
+	size_t	termlines_used;	/* printed line counter */
+	size_t	header_next;	/* where repeat header */
+
+	const char *cur_color;	/* current active color when printing */
+
+	/* flags */
+	unsigned int	ascii		:1,	/* don't use unicode */
+			colors_wanted	:1,	/* enable colors */
+			is_term		:1,	/* isatty() */
+			padding_debug	:1,	/* output visible padding chars */
+			is_dummy_print	:1,	/* printing used for width calculation only */
+			is_shellvar	:1,	/* shell compatible column names */
+			maxout		:1,	/* maximize output */
+			minout		:1,	/* minimize output (mutually exclusive to maxout) */
+			header_repeat   :1,     /* print header after libscols_table->termheight */
+			header_printed  :1,	/* header already printed */
+			priv_symbols	:1,	/* default private symbols */
+			walk_last_done	:1,	/* last tree root walked */
+			no_headings	:1,	/* don't print header */
+			no_encode	:1,	/* don't care about control and non-printable chars */
+			no_linesep	:1,	/* don't print line separator */
+			no_wrap		:1;	/* never wrap lines */
+};
+
+#define IS_ITER_FORWARD(_i)	((_i)->direction == SCOLS_ITER_FORWARD)
+#define IS_ITER_BACKWARD(_i)	((_i)->direction == SCOLS_ITER_BACKWARD)
+
+#define SCOLS_ITER_INIT(itr, list) \
+	do { \
+		(itr)->p = IS_ITER_FORWARD(itr) ? \
+				(list)->next : (list)->prev; \
+		(itr)->head = (list); \
+	} while(0)
+
+#define SCOLS_ITER_ITERATE(itr, res, restype, member) \
+	do { \
+		res = list_entry((itr)->p, restype, member); \
+		(itr)->p = IS_ITER_FORWARD(itr) ? \
+				(itr)->p->next : (itr)->p->prev; \
+	} while(0)
+
+
+static inline int scols_iter_is_last(const struct libscols_iter *itr)
+{
+	if (!itr || !itr->head || !itr->p)
+		return 0;
+
+	return itr->p == itr->head;
+}
+
+/*
+ * line.c
+ */
+int scols_line_next_group_child(struct libscols_line *ln,
+                          struct libscols_iter *itr,
+                          struct libscols_line **chld);
+
+
+/*
+ * table.c
+ */
+int scols_table_next_group(struct libscols_table *tb,
+                          struct libscols_iter *itr,
+                          struct libscols_group **gr);
+
+/*
+ * grouping.c
+ */
+void scols_ref_group(struct libscols_group *gr);
+void scols_group_remove_children(struct libscols_group *gr);
+void scols_group_remove_members(struct libscols_group *gr);
+void scols_unref_group(struct libscols_group *gr);
+void scols_groups_fix_members_order(struct libscols_table *tb);
+int scols_groups_update_grpset(struct libscols_table *tb, struct libscols_line *ln);
+void scols_groups_reset_state(struct libscols_table *tb);
+struct libscols_group *scols_grpset_get_printable_children(struct libscols_table *tb);
+
+/*
+ * walk.c
+ */
+extern 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);
+extern int scols_walk_is_last(struct libscols_table *tb, struct libscols_line *ln);
+
+/*
+ * calculate.c
+ */
+extern int __scols_calculate(struct libscols_table *tb, struct ul_buffer *buf);
+
+/*
+ * print.c
+ */
+extern int __cell_to_buffer(struct libscols_table *tb,
+                          struct libscols_line *ln,
+                          struct libscols_column *cl,
+                          struct ul_buffer *buf);
+
+void __scols_cleanup_printing(struct libscols_table *tb, struct ul_buffer *buf);
+int __scols_initialize_printing(struct libscols_table *tb, struct ul_buffer *buf);
+int __scols_print_tree(struct libscols_table *tb, struct ul_buffer *buf);
+int __scols_print_table(struct libscols_table *tb, struct ul_buffer *buf);
+int __scols_print_header(struct libscols_table *tb, struct ul_buffer *buf);
+int __scols_print_title(struct libscols_table *tb);
+int __scols_print_range(struct libscols_table *tb,
+                        struct ul_buffer *buf,
+                        struct libscols_iter *itr,
+                        struct libscols_line *end);
+
+static inline int is_tree_root(struct libscols_line *ln)
+{
+	return ln && !ln->parent && !ln->parent_group;
+}
+
+static inline int is_last_tree_root(struct libscols_table *tb, struct libscols_line *ln)
+{
+	if (!ln || !tb || tb->walk_last_tree_root != ln)
+		return 0;
+
+	return 1;
+}
+
+static inline int is_child(struct libscols_line *ln)
+{
+	return ln && ln->parent;
+}
+
+static inline int is_last_child(struct libscols_line *ln)
+{
+	if (!ln || !ln->parent)
+		return 0;
+
+	return list_entry_is_last(&ln->ln_children, &ln->parent->ln_branch);
+}
+
+static inline int is_first_child(struct libscols_line *ln)
+{
+	if (!ln || !ln->parent)
+		return 0;
+
+	return list_entry_is_first(&ln->ln_children, &ln->parent->ln_branch);
+}
+
+
+static inline int is_last_column(struct libscols_column *cl)
+{
+	struct libscols_column *next;
+
+	if (list_entry_is_last(&cl->cl_columns, &cl->table->tb_columns))
+		return 1;
+
+	next = list_entry(cl->cl_columns.next, struct libscols_column, cl_columns);
+	if (next && scols_column_is_hidden(next) && is_last_column(next))
+		return 1;
+	return 0;
+}
+
+static inline int is_last_group_member(struct libscols_line *ln)
+{
+	if (!ln || !ln->group)
+		return 0;
+
+	return list_entry_is_last(&ln->ln_groups, &ln->group->gr_members);
+}
+
+static inline int is_first_group_member(struct libscols_line *ln)
+{
+	if (!ln || !ln->group)
+		return 0;
+
+	return list_entry_is_first(&ln->ln_groups, &ln->group->gr_members);
+}
+
+static inline int is_group_member(struct libscols_line *ln)
+{
+	return ln && ln->group;
+}
+
+static inline int is_last_group_child(struct libscols_line *ln)
+{
+	if (!ln || !ln->parent_group)
+		return 0;
+
+	return list_entry_is_last(&ln->ln_children, &ln->parent_group->gr_children);
+}
+
+static inline int is_group_child(struct libscols_line *ln)
+{
+	return ln && ln->parent_group;
+}
+
+static inline int has_groups(struct libscols_table *tb)
+{
+	return tb && !list_empty(&tb->tb_groups);
+}
+
+static inline int has_children(struct libscols_line *ln)
+{
+	return ln && !list_empty(&ln->ln_branch);
+}
+
+static inline int has_group_children(struct libscols_line *ln)
+{
+	return ln && ln->group && !list_empty(&ln->group->gr_children);
+}
+
+#endif /* _LIBSMARTCOLS_PRIVATE_H */
diff --git a/libsmartcols/src/symbols.c b/libsmartcols/src/symbols.c
new file mode 100644
index 0000000..2fadfc7
--- /dev/null
+++ b/libsmartcols/src/symbols.c
@@ -0,0 +1,293 @@
+/*
+ * symbols.c - routines for symbol handling
+ *
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ * Copyright (C) 2016 Igor Gnatenko <i.gnatenko.brain@gmail.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * SECTION: symbols
+ * @title: Symbols
+ * @short_description: can be used to overwrite default output chars (for ascii art)
+ *
+ * An API to access and modify data and information per symbol/symbol group.
+ */
+
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "smartcolsP.h"
+
+/**
+ * scols_new_symbols:
+ *
+ * Returns: a pointer to a newly allocated struct libscols_symbols instance.
+ */
+struct libscols_symbols *scols_new_symbols(void)
+{
+	struct libscols_symbols *sy = calloc(1, sizeof(struct libscols_symbols));
+
+	if (!sy)
+		return NULL;
+	sy->refcount = 1;
+	return sy;
+}
+
+/**
+ * scols_ref_symbols:
+ * @sy: a pointer to a struct libscols_symbols instance
+ *
+ * Increases the refcount of @sy.
+ */
+void scols_ref_symbols(struct libscols_symbols *sy)
+{
+	if (sy)
+		sy->refcount++;
+}
+
+/**
+ * scols_unref_symbols:
+ * @sy: a pointer to a struct libscols_symbols instance
+ *
+ * Decreases the refcount of @sy.
+ */
+void scols_unref_symbols(struct libscols_symbols *sy)
+{
+	if (sy && --sy->refcount <= 0) {
+		free(sy->tree_branch);
+		free(sy->tree_vert);
+		free(sy->tree_right);
+		free(sy->group_last_member);
+		free(sy->group_middle_member);
+		free(sy->group_first_member);
+		free(sy->group_vert);
+		free(sy->group_horz);
+		free(sy->group_last_child);
+		free(sy->group_middle_child);
+		free(sy->title_padding);
+		free(sy->cell_padding);
+		free(sy);
+	}
+}
+
+/**
+ * scols_symbols_set_branch:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent the branch part of a tree output
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_symbols_set_branch(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, tree_branch, str);
+}
+
+/**
+ * scols_symbols_set_vertical:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent the vertical part of a tree output
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_symbols_set_vertical(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, tree_vert, str);
+}
+
+/**
+ * scols_symbols_set_right:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent the right part of a tree output
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_symbols_set_right(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, tree_right, str);
+}
+
+/**
+ * scols_symbols_set_title_padding:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent the symbols which fill title output
+ *
+ * The current implementation uses only the first byte from the padding string.
+ * A multibyte chars are not supported yet.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.28
+ */
+int scols_symbols_set_title_padding(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, title_padding, str);
+}
+
+/**
+ * scols_symbols_set_cell_padding:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent the symbols which fill cells
+ *
+ * The padding char has to take up just one cell on the terminal.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.29
+ */
+int scols_symbols_set_cell_padding(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, cell_padding, str);
+}
+
+
+/**
+ * scols_symbols_set_group_vertical:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent the vertival line
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_symbols_set_group_vertical(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, group_vert, str);
+}
+
+/**
+ * scols_symbols_set_group_horizontal:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent the horizontal line
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_symbols_set_group_horizontal(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, group_horz, str);
+}
+
+/**
+ * scols_symbols_set_group_first_member:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent first member
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_symbols_set_group_first_member(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, group_first_member, str);
+}
+
+/**
+ * scols_symbols_set_group_last_member:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent last member
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_symbols_set_group_last_member(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, group_last_member, str);
+}
+
+/**
+ * scols_symbols_set_group_middle:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent middle member
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_symbols_set_group_middle_member(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, group_middle_member, str);
+}
+
+/**
+ * scols_symbols_set_group_last_child:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent last child
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_symbols_set_group_last_child(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, group_last_child, str);
+}
+
+/**
+ * scols_symbols_set_group_middle_child:
+ * @sy: a pointer to a struct libscols_symbols instance
+ * @str: a string which will represent last child
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.34
+ */
+int scols_symbols_set_group_middle_child(struct libscols_symbols *sy, const char *str)
+{
+	return strdup_to_struct_member(sy, group_middle_child, str);
+}
+
+/**
+ * scols_copy_symbols:
+ * @sy: a pointer to a struct libscols_symbols instance
+ *
+ * Returns: a newly allocated copy of the @sy symbol group or NULL in case of an error.
+ */
+struct libscols_symbols *scols_copy_symbols(const struct libscols_symbols *sy)
+{
+	struct libscols_symbols *ret;
+	int rc;
+
+	assert(sy);
+	if (!sy)
+		return NULL;
+
+	ret = scols_new_symbols();
+	if (!ret)
+		return NULL;
+
+	rc = scols_symbols_set_branch(ret, sy->tree_branch);
+	if (!rc)
+		rc = scols_symbols_set_vertical(ret, sy->tree_vert);
+	if (!rc)
+		rc = scols_symbols_set_right(ret, sy->tree_right);
+	if (!rc)
+		rc = scols_symbols_set_group_vertical(ret, sy->group_vert);
+	if (!rc)
+		rc = scols_symbols_set_group_horizontal(ret, sy->group_horz);
+	if (!rc)
+		rc = scols_symbols_set_group_first_member(ret, sy->group_first_member);
+	if (!rc)
+		rc = scols_symbols_set_group_last_member(ret, sy->group_last_member);
+	if (!rc)
+		rc = scols_symbols_set_group_middle_member(ret, sy->group_middle_member);
+	if (!rc)
+		rc = scols_symbols_set_group_middle_child(ret, sy->group_middle_child);
+	if (!rc)
+		rc = scols_symbols_set_group_last_child(ret, sy->group_last_child);
+	if (!rc)
+		rc = scols_symbols_set_title_padding(ret, sy->title_padding);
+	if (!rc)
+		rc = scols_symbols_set_cell_padding(ret, sy->cell_padding);
+	if (!rc)
+		return ret;
+
+	scols_unref_symbols(ret);
+	return NULL;
+}
diff --git a/libsmartcols/src/table.c b/libsmartcols/src/table.c
new file mode 100644
index 0000000..8449c4f
--- /dev/null
+++ b/libsmartcols/src/table.c
@@ -0,0 +1,1783 @@
+/*
+ * table.c - functions handling the data at the table level
+ *
+ * Copyright (C) 2010-2014 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ * Copyright (C) 2016 Igor Gnatenko <i.gnatenko.brain@gmail.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * SECTION: table
+ * @title: Table
+ * @short_description: container for rows and columns
+ *
+ * Table data manipulation API.
+ */
+
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <termios.h>
+#include <ctype.h>
+
+#include "nls.h"
+#include "ttyutils.h"
+#include "smartcolsP.h"
+
+#ifdef HAVE_WIDECHAR
+#define UTF_V	"\342\224\202"	/* U+2502, Vertical line drawing char  |   */
+#define UTF_VR	"\342\224\234"	/* U+251C, Vertical and right          |-  */
+#define UTF_H	"\342\224\200"	/* U+2500, Horizontal                  -   */
+#define UTF_UR	"\342\224\224"	/* U+2514, Up and right                '-  */
+
+#define UTF_V3  "\342\224\206"  /* U+2506 Triple Dash Vertical          |  */
+#define UTF_H3  "\342\224\210"  /* U+2504 Triple Dash Horizontal        -  */
+#define UTF_DR  "\342\224\214"  /* U+250C Down and Right                ,- */
+#define UTF_DH  "\342\224\254"  /* U+252C Down and Horizontal           |' */
+
+#define UTF_TR  "\342\226\266"  /* U+25B6 Black Right-Pointing Triangle  >  */
+#endif /* !HAVE_WIDECHAR */
+
+#define is_last_column(_tb, _cl) \
+		list_entry_is_last(&(_cl)->cl_columns, &(_tb)->tb_columns)
+
+
+static void check_padding_debug(struct libscols_table *tb)
+{
+	const char *str;
+
+	assert(libsmartcols_debug_mask);	/* debug has to be already initialized! */
+
+	str = getenv("LIBSMARTCOLS_DEBUG_PADDING");
+	if (!str || (strcmp(str, "on") != 0 && strcmp(str, "1") != 0))
+		return;
+
+	DBG(INIT, ul_debugobj(tb, "padding debug: ENABLE"));
+	tb->padding_debug = 1;
+}
+
+/**
+ * scols_new_table:
+ *
+ * Returns: A newly allocated table.
+ */
+struct libscols_table *scols_new_table(void)
+{
+	struct libscols_table *tb;
+	int c, l;
+
+	tb = calloc(1, sizeof(struct libscols_table));
+	if (!tb)
+		return NULL;
+
+	tb->refcount = 1;
+	tb->out = stdout;
+
+	get_terminal_dimension(&c, &l);
+	tb->termwidth  = c > 0 ? c : 80;
+	tb->termheight = l > 0 ? l : 24;
+
+	INIT_LIST_HEAD(&tb->tb_lines);
+	INIT_LIST_HEAD(&tb->tb_columns);
+	INIT_LIST_HEAD(&tb->tb_groups);
+
+	DBG(TAB, ul_debugobj(tb, "alloc"));
+	ON_DBG(INIT, check_padding_debug(tb));
+
+	return tb;
+}
+
+/**
+ * scols_ref_table:
+ * @tb: a pointer to a struct libscols_table instance
+ *
+ * Increases the refcount of @tb.
+ */
+void scols_ref_table(struct libscols_table *tb)
+{
+	if (tb)
+		tb->refcount++;
+}
+
+static void scols_table_remove_groups(struct libscols_table *tb)
+{
+	while (!list_empty(&tb->tb_groups)) {
+		struct libscols_group *gr = list_entry(tb->tb_groups.next,
+							struct libscols_group, gr_groups);
+		scols_group_remove_children(gr);
+		scols_group_remove_members(gr);
+		scols_unref_group(gr);
+	}
+}
+
+/**
+ * scols_unref_table:
+ * @tb: a pointer to a struct libscols_table instance
+ *
+ * Decreases the refcount of @tb. When the count falls to zero, the instance
+ * is automatically deallocated.
+ */
+void scols_unref_table(struct libscols_table *tb)
+{
+	if (tb && (--tb->refcount <= 0)) {
+		DBG(TAB, ul_debugobj(tb, "dealloc <-"));
+		scols_table_remove_groups(tb);
+		scols_table_remove_lines(tb);
+		scols_table_remove_columns(tb);
+		scols_unref_symbols(tb->symbols);
+		scols_reset_cell(&tb->title);
+		free(tb->grpset);
+		free(tb->linesep);
+		free(tb->colsep);
+		free(tb->name);
+		free(tb);
+		DBG(TAB, ul_debug("<- done"));
+	}
+}
+
+/* Private API */
+int scols_table_next_group(struct libscols_table *tb,
+			  struct libscols_iter *itr,
+			  struct libscols_group **gr)
+{
+	int rc = 1;
+
+	if (!tb || !itr || !gr)
+		return -EINVAL;
+	*gr = NULL;
+
+	if (!itr->head)
+		SCOLS_ITER_INIT(itr, &tb->tb_groups);
+	if (itr->p != itr->head) {
+		SCOLS_ITER_ITERATE(itr, *gr, struct libscols_group, gr_groups);
+		rc = 0;
+	}
+
+	return rc;
+}
+
+/**
+ * scols_table_set_name:
+ * @tb: a pointer to a struct libscols_table instance
+ * @name: a name
+ *
+ * The table name is used for example for JSON top level object name.
+ *
+ * Returns: 0, a negative number in case of an error.
+ *
+ * Since: 2.27
+ */
+int scols_table_set_name(struct libscols_table *tb, const char *name)
+{
+	return strdup_to_struct_member(tb, name, name);
+}
+
+/**
+ * scols_table_get_name:
+ * @tb: a pointer to a struct libscols_table instance
+ *
+ * Returns: The current name setting of the table @tb
+ *
+ * Since: 2.29
+ */
+const char *scols_table_get_name(const struct libscols_table *tb)
+{
+	return tb->name;
+}
+
+/**
+ * scols_table_get_title:
+ * @tb: a pointer to a struct libscols_table instance
+ *
+ * The returned pointer is possible to modify by cell functions. Note that
+ * title output alignment on non-tty is hardcoded to 80 output chars. For the
+ * regular terminal it's based on terminal width.
+ *
+ * Returns: Title of the table, or NULL in case of blank title.
+ *
+ * Since: 2.28
+ */
+struct libscols_cell *scols_table_get_title(struct libscols_table *tb)
+{
+	return &tb->title;
+}
+
+/**
+ * scols_table_add_column:
+ * @tb: a pointer to a struct libscols_table instance
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Adds @cl to @tb's column list. The column cannot be shared between more
+ * tables.
+ *
+ * Returns: 0, a negative number in case of an error.
+ */
+int scols_table_add_column(struct libscols_table *tb, struct libscols_column *cl)
+{
+	struct libscols_iter itr;
+	struct libscols_line *ln;
+	int rc = 0;
+
+	if (!tb || !cl || cl->table)
+		return -EINVAL;
+
+	if (!list_empty(&cl->cl_columns))
+		return -EINVAL;
+
+	if (cl->flags & SCOLS_FL_TREE)
+		tb->ntreecols++;
+
+	DBG(TAB, ul_debugobj(tb, "add column"));
+	list_add_tail(&cl->cl_columns, &tb->tb_columns);
+	cl->seqnum = tb->ncols++;
+	cl->table = tb;
+	scols_ref_column(cl);
+
+	if (list_empty(&tb->tb_lines))
+		return 0;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+
+	/* Realloc line cell arrays
+	 */
+	while (scols_table_next_line(tb, &itr, &ln) == 0) {
+		rc = scols_line_alloc_cells(ln, tb->ncols);
+		if (rc)
+			break;
+	}
+
+	return rc;
+}
+
+/**
+ * scols_table_remove_column:
+ * @tb: a pointer to a struct libscols_table instance
+ * @cl: a pointer to a struct libscols_column instance
+ *
+ * Removes @cl from @tb.
+ *
+ * Returns: 0, a negative number in case of an error.
+ */
+int scols_table_remove_column(struct libscols_table *tb,
+			      struct libscols_column *cl)
+{
+	if (!tb || !cl || !list_empty(&tb->tb_lines))
+		return -EINVAL;
+
+	if (cl->flags & SCOLS_FL_TREE)
+		tb->ntreecols--;
+	if (tb->dflt_sort_column == cl)
+		tb->dflt_sort_column = NULL;
+
+	DBG(TAB, ul_debugobj(tb, "remove column"));
+	list_del_init(&cl->cl_columns);
+	tb->ncols--;
+	cl->table = NULL;
+	scols_unref_column(cl);
+	return 0;
+}
+
+/**
+ * scols_table_remove_columns:
+ * @tb: a pointer to a struct libscols_table instance
+ *
+ * Removes all of @tb's columns.
+ *
+ * Returns: 0, a negative number in case of an error.
+ */
+int scols_table_remove_columns(struct libscols_table *tb)
+{
+	if (!tb || !list_empty(&tb->tb_lines))
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "remove all columns"));
+	while (!list_empty(&tb->tb_columns)) {
+		struct libscols_column *cl = list_entry(tb->tb_columns.next,
+					struct libscols_column, cl_columns);
+		scols_table_remove_column(tb, cl);
+	}
+	return 0;
+}
+
+/**
+ * scols_table_move_column:
+ * @tb: table
+ * @pre: column before the column
+ * @cl: column to move
+ *
+ * Move the @cl behind @pre. If the @pre is NULL then the @col is the first
+ * column in the table.
+ *
+ * Since: 2.30
+ *
+ * Returns: 0, a negative number in case of an error.
+ */
+int scols_table_move_column(struct libscols_table *tb,
+			    struct libscols_column *pre,
+			    struct libscols_column *cl)
+{
+	struct list_head *head;
+	struct libscols_iter itr;
+	struct libscols_column *p;
+	struct libscols_line *ln;
+	size_t n = 0, oldseq;
+
+	if (!tb || !cl)
+		return -EINVAL;
+
+	if (pre && pre->seqnum + 1 == cl->seqnum)
+		return 0;
+	if (pre == NULL && cl->seqnum == 0)
+		return 0;
+
+	DBG(TAB, ul_debugobj(tb, "move column %zu behind %zu",
+				cl->seqnum, pre? pre->seqnum : 0));
+
+	list_del_init(&cl->cl_columns);		/* remove from old position */
+
+	head = pre ? &pre->cl_columns : &tb->tb_columns;
+	list_add(&cl->cl_columns, head);	/* add to the new place */
+
+	oldseq = cl->seqnum;
+
+	/* fix seq. numbers */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &p) == 0)
+		p->seqnum = n++;
+
+	/* move data in lines */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_line(tb, &itr, &ln) == 0)
+		scols_line_move_cells(ln, cl->seqnum, oldseq);
+	return 0;
+}
+
+/**
+ * scols_table_new_column:
+ * @tb: table
+ * @name: column header
+ * @whint: column width hint (absolute width: N > 1; relative width: 0 < N < 1)
+ * @flags: flags integer
+ *
+ * This is shortcut for
+ *
+ *   cl = scols_new_column();
+ *   scols_column_set_....(cl, ...);
+ *   scols_table_add_column(tb, cl);
+ *
+ * The column width is possible to define by:
+ *
+ *  @whint: 0 < N < 1  : relative width, percent of terminal width
+ *
+ *  @whint: N >= 1     : absolute width, empty column will be truncated to
+ *                     the column header width if no specified STRICTWIDTH flag
+ *
+ * Note that if table has disabled "maxout" flag (disabled by default) than
+ * relative width is used as a hint only. It's possible that column will be
+ * narrow if the specified size is too large for column data.
+ *
+ *
+ * If the width of all columns is greater than terminal width then library
+ * tries to reduce width of the individual columns. It's done in three stages:
+ *
+ * #1 reduce columns with SCOLS_FL_TRUNC flag and with relative width if the
+ *    width is greater than width defined by @whint (@whint * terminal_width)
+ *
+ * #2 reduce all columns with SCOLS_FL_TRUNC flag
+ *
+ * #3 reduce all columns with relative width
+ *
+ * The next stage is always used if the previous stage is unsuccessful. Note
+ * that SCOLS_FL_WRAP is interpreted as SCOLS_FL_TRUNC when calculate column
+ * width (if custom wrap function is not specified), but the final text is not
+ * truncated, but wrapped to multi-line cell.
+ *
+ *
+ * The column is necessary to address by sequential number. The first defined
+ * column has the colnum = 0. For example:
+ *
+ *	scols_table_new_column(tab, "FOO", 0.5, 0);		// colnum = 0
+ *	scols_table_new_column(tab, "BAR", 0.5, 0);		// colnum = 1
+ *      .
+ *      .
+ *	scols_line_get_cell(line, 0);				// FOO column
+ *	scols_line_get_cell(line, 1);				// BAR column
+ *
+ * Returns: newly allocated column
+ */
+struct libscols_column *scols_table_new_column(struct libscols_table *tb,
+					       const char *name,
+					       double whint,
+					       int flags)
+{
+	struct libscols_column *cl;
+
+	if (!tb)
+		return NULL;
+
+	DBG(TAB, ul_debugobj(tb, "new column name=%s, whint=%g, flags=0x%04x",
+				name, whint, flags));
+	cl = scols_new_column();
+	if (!cl)
+		return NULL;
+
+	if (name && scols_column_set_name(cl, name))
+		goto err;
+	scols_column_set_whint(cl, whint);
+	scols_column_set_flags(cl, flags);
+
+	if (scols_table_add_column(tb, cl))	/* this increments column ref-counter */
+		goto err;
+
+	scols_unref_column(cl);
+	return cl;
+err:
+	scols_unref_column(cl);
+	return NULL;
+}
+
+/**
+ * scols_table_next_column:
+ * @tb: a pointer to a struct libscols_table instance
+ * @itr: a pointer to a struct libscols_iter instance
+ * @cl: a pointer to a pointer to a struct libscols_column instance
+ *
+ * Returns the next column of @tb via @cl.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_next_column(struct libscols_table *tb,
+			    struct libscols_iter *itr,
+			    struct libscols_column **cl)
+{
+	int rc = 1;
+
+	if (!tb || !itr || !cl)
+		return -EINVAL;
+	*cl = NULL;
+
+	if (!itr->head)
+		SCOLS_ITER_INIT(itr, &tb->tb_columns);
+	if (itr->p != itr->head) {
+		SCOLS_ITER_ITERATE(itr, *cl, struct libscols_column, cl_columns);
+		rc = 0;
+	}
+
+	return rc;
+}
+
+/**
+ * scols_table_set_columns_iter:
+ * @tb: tab pointer
+ * @itr: iterator
+ * @cl: tab entry
+ *
+ * Sets @iter to the position of @cl in the file @tb.
+ *
+ * Returns: 0 on success, negative number in case of error.
+ *
+ * Since: 2.35
+ */
+int scols_table_set_columns_iter(
+			struct libscols_table *tb,
+			struct libscols_iter *itr,
+			struct libscols_column *cl)
+{
+	if (!tb || !itr || !cl)
+		return -EINVAL;
+
+	if (cl->table != tb)
+		return -EINVAL;
+
+	SCOLS_ITER_INIT(itr, &tb->tb_columns);
+	itr->p = &cl->cl_columns;
+
+	return 0;
+}
+
+/**
+ * scols_table_get_ncols:
+ * @tb: table
+ *
+ * Returns: the ncols table member.
+ */
+size_t scols_table_get_ncols(const struct libscols_table *tb)
+{
+	return tb->ncols;
+}
+
+/**
+ * scols_table_get_nlines:
+ * @tb: table
+ *
+ * Returns: the nlines table member.
+ */
+size_t scols_table_get_nlines(const struct libscols_table *tb)
+{
+	return tb->nlines;
+}
+
+/**
+ * scols_table_set_stream:
+ * @tb: table
+ * @stream: output stream
+ *
+ * Sets the output stream for table @tb.
+ *
+ * Returns: 0, a negative number in case of an error.
+ */
+int scols_table_set_stream(struct libscols_table *tb, FILE *stream)
+{
+	assert(tb);
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "setting alternative stream"));
+	tb->out = stream;
+	return 0;
+}
+
+/**
+ * scols_table_get_stream:
+ * @tb: table
+ *
+ * Gets the output stream for table @tb.
+ *
+ * Returns: stream pointer, NULL in case of an error or an unset stream.
+ */
+FILE *scols_table_get_stream(const struct libscols_table *tb)
+{
+	return tb->out;
+}
+
+/**
+ * scols_table_reduce_termwidth:
+ * @tb: table
+ * @reduce: width
+ *
+ * If necessary then libsmartcols use all terminal width, the @reduce setting
+ * provides extra space (for example for borders in ncurses applications).
+ *
+ * The @reduce must be smaller than terminal width, otherwise it's silently
+ * ignored. The reduction is not applied when STDOUT_FILENO is not terminal.
+ *
+ * Note that after output initialization (scols_table_print_* calls) the width
+ * will be reduced, this behavior affects subsequenced scols_table_get_termwidth()
+ * calls.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_reduce_termwidth(struct libscols_table *tb, size_t reduce)
+{
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "reduce terminal width: %zu", reduce));
+	tb->termreduce = reduce;
+	return 0;
+}
+
+/**
+ * scols_table_get_column:
+ * @tb: table
+ * @n: number of column (0..N)
+ *
+ * Returns: pointer to column or NULL
+ */
+struct libscols_column *scols_table_get_column(struct libscols_table *tb,
+					       size_t n)
+{
+	struct libscols_iter itr;
+	struct libscols_column *cl;
+
+	if (!tb)
+		return NULL;
+	if (n >= tb->ncols)
+		return NULL;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0) {
+		if (cl->seqnum == n)
+			return cl;
+	}
+	return NULL;
+}
+
+/**
+ * scols_table_get_column_ny_name
+ * @tb: table
+ * @name: column name
+ *
+ * Returns: pointer to column or NULL
+ *
+ * Since: 2.39
+ */
+struct libscols_column *scols_table_get_column_by_name(
+				struct libscols_table *tb, const char *name)
+{
+	struct libscols_iter itr;
+	struct libscols_column *cl;
+
+	if (!tb || !name)
+		return NULL;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0) {
+		const char *cn = scols_column_get_name(cl);
+
+		if (cn && strcmp(cn, name) == 0)
+			return cl;
+	}
+	return NULL;
+}
+
+
+/**
+ * scols_table_add_line:
+ * @tb: table
+ * @ln: line
+ *
+ * Note that this function calls scols_line_alloc_cells() if number
+ * of the cells in the line is too small for @tb.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_add_line(struct libscols_table *tb, struct libscols_line *ln)
+{
+	if (!tb || !ln)
+		return -EINVAL;
+
+	if (!list_empty(&ln->ln_lines))
+		return -EINVAL;
+
+	if (tb->ncols > ln->ncells) {
+		int rc = scols_line_alloc_cells(ln, tb->ncols);
+		if (rc)
+			return rc;
+	}
+
+	DBG(TAB, ul_debugobj(tb, "add line"));
+	list_add_tail(&ln->ln_lines, &tb->tb_lines);
+	ln->seqnum = tb->nlines++;
+	scols_ref_line(ln);
+	return 0;
+}
+
+/**
+ * scols_table_remove_line:
+ * @tb: table
+ * @ln: line
+ *
+ * Note that this function does not destroy the parent<->child relationship between lines.
+ * You have to call scols_line_remove_child()
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_remove_line(struct libscols_table *tb,
+			    struct libscols_line *ln)
+{
+	if (!tb || !ln)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "remove line"));
+	list_del_init(&ln->ln_lines);
+	tb->nlines--;
+	scols_unref_line(ln);
+	return 0;
+}
+
+/**
+ * scols_table_remove_lines:
+ * @tb: table
+ *
+ * This empties the table and also destroys all the parent<->child relationships.
+ */
+void scols_table_remove_lines(struct libscols_table *tb)
+{
+	if (!tb)
+		return;
+
+	DBG(TAB, ul_debugobj(tb, "remove all lines"));
+	while (!list_empty(&tb->tb_lines)) {
+		struct libscols_line *ln = list_entry(tb->tb_lines.next,
+						struct libscols_line, ln_lines);
+		if (ln->parent)
+			scols_line_remove_child(ln->parent, ln);
+		scols_table_remove_line(tb, ln);
+	}
+}
+
+/**
+ * scols_table_next_line:
+ * @tb: a pointer to a struct libscols_table instance
+ * @itr: a pointer to a struct libscols_iter instance
+ * @ln: a pointer to a pointer to a struct libscols_line instance
+ *
+ * Finds the next line and returns a pointer to it via @ln.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_next_line(struct libscols_table *tb,
+			  struct libscols_iter *itr,
+			  struct libscols_line **ln)
+{
+	int rc = 1;
+
+	if (!tb || !itr || !ln)
+		return -EINVAL;
+	*ln = NULL;
+
+	if (!itr->head)
+		SCOLS_ITER_INIT(itr, &tb->tb_lines);
+	if (itr->p != itr->head) {
+		SCOLS_ITER_ITERATE(itr, *ln, struct libscols_line, ln_lines);
+		rc = 0;
+	}
+
+	return rc;
+}
+
+/**
+ * scols_table_new_line:
+ * @tb: table
+ * @parent: parental line or NULL
+ *
+ * This is shortcut for
+ *
+ *   ln = scols_new_line();
+ *   scols_table_add_line(tb, ln);
+ *   scols_line_add_child(parent, ln);
+ *
+ *
+ * Returns: newly allocate line
+ */
+struct libscols_line *scols_table_new_line(struct libscols_table *tb,
+					   struct libscols_line *parent)
+{
+	struct libscols_line *ln;
+
+	if (!tb)
+		return NULL;
+
+	ln = scols_new_line();
+	if (!ln)
+		return NULL;
+
+	if (scols_table_add_line(tb, ln))
+		goto err;
+	if (parent)
+		scols_line_add_child(parent, ln);
+
+	scols_unref_line(ln);	/* ref-counter incremented by scols_table_add_line() */
+	return ln;
+err:
+	scols_unref_line(ln);
+	return NULL;
+}
+
+/**
+ * scols_table_get_line:
+ * @tb: table
+ * @n: column number (0..N)
+ *
+ * Returns: a line or NULL
+ */
+struct libscols_line *scols_table_get_line(struct libscols_table *tb,
+					   size_t n)
+{
+	struct libscols_iter itr;
+	struct libscols_line *ln;
+
+	if (!tb)
+		return NULL;
+	if (n >= tb->nlines)
+		return NULL;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_line(tb, &itr, &ln) == 0) {
+		if (ln->seqnum == n)
+			return ln;
+	}
+	return NULL;
+}
+
+/**
+ * scols_copy_table:
+ * @tb: table
+ *
+ * Creates a new independent table copy, except struct libscols_symbols that
+ * are shared between the tables.
+ *
+ * Returns: a newly allocated copy of @tb
+ */
+struct libscols_table *scols_copy_table(struct libscols_table *tb)
+{
+	struct libscols_table *ret;
+	struct libscols_line *ln;
+	struct libscols_column *cl;
+	struct libscols_iter itr;
+
+	if (!tb)
+		return NULL;
+	ret = scols_new_table();
+	if (!ret)
+		return NULL;
+
+	DBG(TAB, ul_debugobj(tb, "copy"));
+
+	if (tb->symbols)
+		scols_table_set_symbols(ret, tb->symbols);
+
+	/* columns */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0) {
+		cl = scols_copy_column(cl);
+		if (!cl)
+			goto err;
+		if (scols_table_add_column(ret, cl))
+			goto err;
+		scols_unref_column(cl);
+	}
+
+	/* lines */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_line(tb, &itr, &ln) == 0) {
+		struct libscols_line *newln = scols_copy_line(ln);
+		if (!newln)
+			goto err;
+		if (scols_table_add_line(ret, newln))
+			goto err;
+		if (ln->parent) {
+			struct libscols_line *p =
+				scols_table_get_line(ret, ln->parent->seqnum);
+			if (p)
+				scols_line_add_child(p, newln);
+		}
+		scols_unref_line(newln);
+	}
+
+	/* separators */
+	if (scols_table_set_column_separator(ret, tb->colsep) ||
+	    scols_table_set_line_separator(ret, tb->linesep))
+		goto err;
+
+	return ret;
+err:
+	scols_unref_table(ret);
+	return NULL;
+}
+
+/**
+ * scols_table_set_default_symbols:
+ * @tb: table
+ *
+ * The library check the current environment to select ASCII or UTF8 symbols.
+ * This default behavior could be controlled by scols_table_enable_ascii().
+ *
+ * Use scols_table_set_symbols() to unset symbols or use your own setting.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.29
+ */
+int scols_table_set_default_symbols(struct libscols_table *tb)
+{
+	struct libscols_symbols *sy;
+	int rc;
+
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "setting default symbols"));
+
+	sy = scols_new_symbols();
+	if (!sy)
+		return -ENOMEM;
+
+#if defined(HAVE_WIDECHAR)
+	if (!scols_table_is_ascii(tb) &&
+	    !strcmp(nl_langinfo(CODESET), "UTF-8")) {
+		/* tree chart */
+		scols_symbols_set_branch(sy, UTF_VR UTF_H);
+		scols_symbols_set_vertical(sy, UTF_V " ");
+		scols_symbols_set_right(sy, UTF_UR UTF_H);
+		/* groups chart */
+		scols_symbols_set_group_horizontal(sy, UTF_H3);
+		scols_symbols_set_group_vertical(sy, UTF_V3);
+
+		scols_symbols_set_group_first_member(sy,  UTF_DR UTF_H3 UTF_TR);
+		scols_symbols_set_group_last_member(sy,   UTF_UR UTF_DH UTF_TR);
+		scols_symbols_set_group_middle_member(sy, UTF_VR UTF_H3 UTF_TR);
+		scols_symbols_set_group_last_child(sy,    UTF_UR UTF_H3);
+		scols_symbols_set_group_middle_child(sy,  UTF_VR UTF_H3);
+	} else
+#endif
+	{
+		/* tree chart */
+		scols_symbols_set_branch(sy, "|-");
+		scols_symbols_set_vertical(sy, "| ");
+		scols_symbols_set_right(sy, "`-");
+		/* groups chart */
+		scols_symbols_set_group_horizontal(sy, "-");
+		scols_symbols_set_group_vertical(sy, "|");
+
+		scols_symbols_set_group_first_member(sy, ",->");
+		scols_symbols_set_group_last_member(sy, "'->");
+		scols_symbols_set_group_middle_member(sy, "|->");
+		scols_symbols_set_group_last_child(sy, "`-");
+		scols_symbols_set_group_middle_child(sy, "|-");
+	}
+	scols_symbols_set_title_padding(sy, " ");
+	scols_symbols_set_cell_padding(sy, " ");
+
+	rc = scols_table_set_symbols(tb, sy);
+	scols_unref_symbols(sy);
+	return rc;
+}
+
+
+/**
+ * scols_table_set_symbols:
+ * @tb: table
+ * @sy: symbols or NULL
+ *
+ * Add a reference to @sy from the table. The symbols are used by library to
+ * draw tree output. If no symbols are used for the table then library creates
+ * default temporary symbols to draw output by scols_table_set_default_symbols().
+ *
+ * If @sy is NULL then remove reference from the currently used symbols.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_set_symbols(struct libscols_table *tb,
+			    struct libscols_symbols *sy)
+{
+	if (!tb)
+		return -EINVAL;
+
+	/* remove old */
+	if (tb->symbols) {
+		DBG(TAB, ul_debugobj(tb, "remove symbols reference"));
+		scols_unref_symbols(tb->symbols);
+		tb->symbols = NULL;
+	}
+
+	/* set new */
+	if (sy) {					/* ref user defined */
+		DBG(TAB, ul_debugobj(tb, "set symbols"));
+		tb->symbols = sy;
+		scols_ref_symbols(sy);
+	}
+	return 0;
+}
+
+/**
+ * scols_table_get_symbols:
+ * @tb: table
+ *
+ * Returns: pointer to symbols table.
+ *
+ * Since: 2.29
+ */
+struct libscols_symbols *scols_table_get_symbols(const struct libscols_table *tb)
+{
+	return tb->symbols;
+}
+
+/**
+ * scols_table_enable_nolinesep:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Enable/disable line separator printing. This is useful if you want to
+ * re-printing the same line more than once (e.g. progress bar). Don't use it
+ * if you're not sure.
+ *
+ * Note that for the last line in the table the separator is disabled at all.
+ * The library differentiate between table terminator and line terminator
+ * (although for standard output \n byte is used in both cases).
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ */
+int scols_table_enable_nolinesep(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "nolinesep: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->no_linesep = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * scols_table_is_nolinesep:
+ * @tb: a pointer to a struct libscols_table instance
+ *
+ * Returns: 1 if line separator printing is disabled.
+ *
+ * Since: 2.29
+ */
+int scols_table_is_nolinesep(const struct libscols_table *tb)
+{
+	return tb->no_linesep;
+}
+
+/**
+ * scols_table_enable_colors:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Enable/disable colors.
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ */
+int scols_table_enable_colors(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "colors: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->colors_wanted = enable;
+	return 0;
+}
+
+/**
+ * scols_table_enable_raw:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Enable/disable raw output format. The parsable output formats
+ * (export, raw, JSON, ...) are mutually exclusive.
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ */
+int scols_table_enable_raw(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "raw: %s", enable ? "ENABLE" : "DISABLE"));
+	if (enable)
+		tb->format = SCOLS_FMT_RAW;
+	else if (tb->format == SCOLS_FMT_RAW)
+		tb->format = 0;
+	return 0;
+}
+
+/**
+ * scols_table_enable_json:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Enable/disable JSON output format. The parsable output formats
+ * (export, raw, JSON, ...) are mutually exclusive.
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ *
+ * Since: 2.27
+ */
+int scols_table_enable_json(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "json: %s", enable ? "ENABLE" : "DISABLE"));
+	if (enable)
+		tb->format = SCOLS_FMT_JSON;
+	else if (tb->format == SCOLS_FMT_JSON)
+		tb->format = 0;
+	return 0;
+}
+
+/**
+ * scols_table_enable_export:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Enable/disable export output format (COLUMNAME="value" ...).
+ * The parsable output formats (export and raw) are mutually exclusive.
+ *
+ * See also scols_table_enable_shellvar(). Note that in version 2.37 (and only
+ * in this version) scols_table_enable_shellvar() functionality has been
+ * automatically enabled  for "export" format. This behavior has been reverted
+ * in version 2.38 due to backward compatibility issues. Now it's necessary to
+ * explicitly call scols_table_enable_shellvar().
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ */
+int scols_table_enable_export(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "export: %s", enable ? "ENABLE" : "DISABLE"));
+	if (enable)
+		tb->format = SCOLS_FMT_EXPORT;
+	else if (tb->format == SCOLS_FMT_EXPORT)
+		tb->format = 0;
+	return 0;
+}
+
+/**
+ * scols_table_enable_shellvar:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Force library to print column names to be compatible with shell requirements
+ * to variable names.  For example "1FOO%" will be printed as "_1FOO_PCT".
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ *
+ * Since: 2.38
+ */
+int scols_table_enable_shellvar(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "shellvar: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->is_shellvar = enable ? 1 : 0;
+	return 0;
+}
+
+
+/**
+ * scols_table_enable_ascii:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * The ASCII-only output is relevant for tree-like outputs. The library
+ * checks if the current environment is UTF8 compatible by default. This
+ * function overrides this check and force the library to use ASCII chars
+ * for the tree.
+ *
+ * If a custom libcols_symbols are specified (see scols_table_set_symbols()
+ * then ASCII flag setting is ignored.
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ */
+int scols_table_enable_ascii(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "ascii: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->ascii = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * scols_table_enable_noheadings:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Enable/disable header line.
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ */
+int scols_table_enable_noheadings(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+	DBG(TAB, ul_debugobj(tb, "noheading: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->no_headings = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * scols_table_enable_header_repeat:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Enable/disable header line repeat. The header line is printed only once by
+ * default.  Note that the flag will be silently ignored and disabled if the
+ * output is not on terminal or output format is JSON, raw, etc.
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ *
+ * Since: 2.31
+ */
+int scols_table_enable_header_repeat(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+	DBG(TAB, ul_debugobj(tb, "header-repeat: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->header_repeat = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * scols_table_enable_maxout:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * The extra space after last column is ignored by default. The output
+ * maximization add padding for all columns.
+ *
+ * This setting is mutually exclusive to scols_table_enable_minout().
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ */
+int scols_table_enable_maxout(struct libscols_table *tb, int enable)
+{
+	if (!tb || tb->minout)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "maxout: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->maxout = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * scols_table_enable_minout:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Force library to terminate line after last column with data. The extra
+ * padding is not added to the empty cells at the end of the line. The default is fill
+ * tailing empty cells except the last line cell.
+ *
+ * This setting is mutually exclusive to scols_table_enable_maxout().
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ *
+ * Since: 2.35
+ */
+int scols_table_enable_minout(struct libscols_table *tb, int enable)
+{
+	if (!tb || tb->maxout)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "minout: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->minout = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * scols_table_enable_nowrap:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * Never continue on next line, remove last column(s) when too large, truncate last column.
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ *
+ * Since: 2.28
+ */
+int scols_table_enable_nowrap(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+	DBG(TAB, ul_debugobj(tb, "nowrap: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->no_wrap = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * scols_table_is_nowrap:
+ * @tb: a pointer to a struct libscols_table instance
+ *
+ * Returns: 1 if nowrap is enabled.
+ *
+ * Since: 2.29
+ */
+int scols_table_is_nowrap(const struct libscols_table *tb)
+{
+	return tb->no_wrap;
+}
+
+/**
+ * scols_table_enable_noencoding:
+ * @tb: table
+ * @enable: 1 or 0
+ *
+ * The library encode non-printable and control chars by \xHEX by default.
+ *
+ * Returns: 0 on success, negative number in case of an error.
+ *
+ * Since: 2.31
+ */
+int scols_table_enable_noencoding(struct libscols_table *tb, int enable)
+{
+	if (!tb)
+		return -EINVAL;
+	DBG(TAB, ul_debugobj(tb, "encoding: %s", enable ? "ENABLE" : "DISABLE"));
+	tb->no_encode = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * scols_table_is_noencoding:
+ * @tb: a pointer to a struct libscols_table instance
+ *
+ * Returns: 1 if encoding is disabled.
+ *
+ * Since: 2.31
+ */
+int scols_table_is_noencoding(const struct libscols_table *tb)
+{
+	return tb->no_encode;
+}
+
+/**
+ * scols_table_colors_wanted:
+ * @tb: table
+ *
+ * Returns: 1 if colors are enabled.
+ */
+int scols_table_colors_wanted(const struct libscols_table *tb)
+{
+	return tb->colors_wanted;
+}
+
+/**
+ * scols_table_is_empty:
+ * @tb: table
+ *
+ * Returns: 1 if the table is empty.
+ */
+int scols_table_is_empty(const struct libscols_table *tb)
+{
+	return !tb->nlines;
+}
+
+/**
+ * scols_table_is_ascii:
+ * @tb: table
+ *
+ * Returns: 1 if ASCII tree is enabled.
+ */
+int scols_table_is_ascii(const struct libscols_table *tb)
+{
+	return tb->ascii;
+}
+
+/**
+ * scols_table_is_noheadings:
+ * @tb: table
+ *
+ * Returns: 1 if header output is disabled.
+ */
+int scols_table_is_noheadings(const struct libscols_table *tb)
+{
+	return tb->no_headings;
+}
+
+/**
+ * scols_table_is_header_repeat
+ * @tb: table
+ *
+ * Returns: 1 if header repeat is enabled.
+ *
+ * Since: 2.31
+ */
+int scols_table_is_header_repeat(const struct libscols_table *tb)
+{
+	return tb->header_repeat;
+}
+
+/**
+ * scols_table_is_export:
+ * @tb: table
+ *
+ * Returns: 1 if export output format is enabled.
+ */
+int scols_table_is_export(const struct libscols_table *tb)
+{
+	return tb->format == SCOLS_FMT_EXPORT;
+}
+
+/**
+ * scols_table_is_shellvar:
+ * @tb: table
+ *
+ * Returns: 1 if column names has to be compatible with shell requirements
+ *          to variable names
+ *
+ * Since: 2.38
+ */
+int scols_table_is_shellvar(const struct libscols_table *tb)
+{
+	return tb->is_shellvar;
+}
+
+/**
+ * scols_table_is_raw:
+ * @tb: table
+ *
+ * Returns: 1 if raw output format is enabled.
+ */
+int scols_table_is_raw(const struct libscols_table *tb)
+{
+	return tb->format == SCOLS_FMT_RAW;
+}
+
+/**
+ * scols_table_is_json:
+ * @tb: table
+ *
+ * Returns: 1 if JSON output format is enabled.
+ *
+ * Since: 2.27
+ */
+int scols_table_is_json(const struct libscols_table *tb)
+{
+	return tb->format == SCOLS_FMT_JSON;
+}
+
+/**
+ * scols_table_is_maxout
+ * @tb: table
+ *
+ * Returns: 1 if output maximization is enabled or 0
+ */
+int scols_table_is_maxout(const struct libscols_table *tb)
+{
+	return tb->maxout;
+}
+
+/**
+ * scols_table_is_minout
+ * @tb: table
+ *
+ * Returns: 1 if output minimization is enabled or 0
+ *
+ * Since: 2.35
+ */
+int scols_table_is_minout(const struct libscols_table *tb)
+{
+	return tb->minout;
+}
+
+/**
+ * scols_table_is_tree:
+ * @tb: table
+ *
+ * Returns: returns 1 tree-like output is expected.
+ */
+int scols_table_is_tree(const struct libscols_table *tb)
+{
+	return tb->ntreecols > 0;
+}
+
+/**
+ * scols_table_set_column_separator:
+ * @tb: table
+ * @sep: separator
+ *
+ * Sets the column separator of @tb to @sep.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_set_column_separator(struct libscols_table *tb, const char *sep)
+{
+	return strdup_to_struct_member(tb, colsep, sep);
+}
+
+/**
+ * scols_table_set_line_separator:
+ * @tb: table
+ * @sep: separator
+ *
+ * Sets the line separator of @tb to @sep.
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_table_set_line_separator(struct libscols_table *tb, const char *sep)
+{
+	return strdup_to_struct_member(tb, linesep, sep);
+}
+
+/**
+ * scols_table_get_column_separator:
+ * @tb: table
+ *
+ * Returns: @tb column separator, NULL in case of an error
+ */
+const char *scols_table_get_column_separator(const struct libscols_table *tb)
+{
+	return tb->colsep;
+}
+
+/**
+ * scols_table_get_line_separator:
+ * @tb: table
+ *
+ * Returns: @tb line separator, NULL in case of an error
+ */
+const char *scols_table_get_line_separator(const struct libscols_table *tb)
+{
+	return tb->linesep;
+}
+/* for lines in the struct libscols_line->ln_lines list */
+static int cells_cmp_wrapper_lines(struct list_head *a, struct list_head *b, void *data)
+{
+	struct libscols_column *cl = (struct libscols_column *) data;
+	struct libscols_line *ra, *rb;
+	struct libscols_cell *ca, *cb;
+
+	assert(a);
+	assert(b);
+	assert(cl);
+
+	ra = list_entry(a, struct libscols_line, ln_lines);
+	rb = list_entry(b, struct libscols_line, ln_lines);
+	ca = scols_line_get_cell(ra, cl->seqnum);
+	cb = scols_line_get_cell(rb, cl->seqnum);
+
+	return cl->cmpfunc(ca, cb, cl->cmpfunc_data);
+}
+
+/* for lines in the struct libscols_line->ln_children list */
+static int cells_cmp_wrapper_children(struct list_head *a, struct list_head *b, void *data)
+{
+	struct libscols_column *cl = (struct libscols_column *) data;
+	struct libscols_line *ra, *rb;
+	struct libscols_cell *ca, *cb;
+
+	assert(a);
+	assert(b);
+	assert(cl);
+
+	ra = list_entry(a, struct libscols_line, ln_children);
+	rb = list_entry(b, struct libscols_line, ln_children);
+	ca = scols_line_get_cell(ra, cl->seqnum);
+	cb = scols_line_get_cell(rb, cl->seqnum);
+
+	return cl->cmpfunc(ca, cb, cl->cmpfunc_data);
+}
+
+
+static int sort_line_children(struct libscols_line *ln, struct libscols_column *cl)
+{
+	struct list_head *p;
+
+	if (!list_empty(&ln->ln_branch)) {
+		list_for_each(p, &ln->ln_branch) {
+			struct libscols_line *chld =
+					list_entry(p, struct libscols_line, ln_children);
+			sort_line_children(chld, cl);
+		}
+
+		list_sort(&ln->ln_branch, cells_cmp_wrapper_children, cl);
+	}
+
+	if (is_first_group_member(ln)) {
+		list_for_each(p, &ln->group->gr_children) {
+			struct libscols_line *chld =
+					list_entry(p, struct libscols_line, ln_children);
+			sort_line_children(chld, cl);
+		}
+
+		list_sort(&ln->group->gr_children, cells_cmp_wrapper_children, cl);
+	}
+
+	return 0;
+}
+
+static int  __scols_sort_tree(struct libscols_table *tb, struct libscols_column *cl)
+{
+	struct libscols_line *ln;
+	struct libscols_iter itr;
+
+	if (!tb || !cl || !cl->cmpfunc)
+		return -EINVAL;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_line(tb, &itr, &ln) == 0)
+		sort_line_children(ln, cl);
+	return 0;
+}
+
+/**
+ * scols_sort_table:
+ * @tb: table
+ * @cl: order by this column or NULL
+ *
+ * Orders the table by the column. See also scols_column_set_cmpfunc(). If the
+ * tree output is enabled then children in the tree are recursively sorted too.
+ *
+ * The column @cl is saved as the default sort column to the @tb and the next time
+ * is possible to call scols_sort_table(tb, NULL). The saved column is also used by
+ * scols_sort_table_by_tree().
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_sort_table(struct libscols_table *tb, struct libscols_column *cl)
+{
+	if (!tb)
+		return -EINVAL;
+	if (!cl)
+		cl = tb->dflt_sort_column;
+	if (!cl || !cl->cmpfunc)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "sorting table by %zu column", cl->seqnum));
+	list_sort(&tb->tb_lines, cells_cmp_wrapper_lines, cl);
+
+	if (scols_table_is_tree(tb))
+		__scols_sort_tree(tb, cl);
+
+	if (cl && cl != tb->dflt_sort_column)
+		tb->dflt_sort_column = cl;
+
+	return 0;
+}
+
+/*
+ * Move all @ln's children after @ln in the table.
+ */
+static struct libscols_line *move_line_and_children(struct libscols_line *ln, struct libscols_line *pre)
+{
+	if (pre) {
+		list_del_init(&ln->ln_lines);			/* remove from old position */
+	        list_add(&ln->ln_lines, &pre->ln_lines);        /* add to the new place (after @pre) */
+	}
+	pre = ln;
+
+	if (!list_empty(&ln->ln_branch)) {
+		struct list_head *p;
+
+		list_for_each(p, &ln->ln_branch) {
+			struct libscols_line *chld =
+					list_entry(p, struct libscols_line, ln_children);
+			pre = move_line_and_children(chld, pre);
+		}
+	}
+
+	return pre;
+}
+
+/**
+ * scols_sort_table_by_tree:
+ * @tb: table
+ *
+ * Reorders lines in the table by parent->child relation. Note that order of
+ * the lines in the table is independent on the tree hierarchy by default.
+ *
+ * The children of the lines are sorted according to the default sort column
+ * if scols_sort_table() has been previously called.
+ *
+ * Since: 2.30
+ *
+ * Returns: 0, a negative value in case of an error.
+ */
+int scols_sort_table_by_tree(struct libscols_table *tb)
+{
+	struct libscols_line *ln;
+	struct libscols_iter itr;
+
+	if (!tb)
+		return -EINVAL;
+
+	DBG(TAB, ul_debugobj(tb, "sorting table by tree"));
+
+	if (tb->dflt_sort_column)
+		__scols_sort_tree(tb, tb->dflt_sort_column);
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_line(tb, &itr, &ln) == 0)
+		move_line_and_children(ln, NULL);
+
+	return 0;
+}
+
+
+/**
+ * scols_table_set_termforce:
+ * @tb: table
+ * @force: SCOLS_TERMFORCE_{NEVER,ALWAYS,AUTO}
+ *
+ * Forces library to use stdout as terminal, non-terminal or use automatic
+ * detection (default).
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.29
+ */
+int scols_table_set_termforce(struct libscols_table *tb, int force)
+{
+	if (!tb)
+		return -EINVAL;
+	tb->termforce = force;
+	return 0;
+}
+
+/**
+ * scols_table_get_termforce:
+ * @tb: table
+ *
+ * Returns: SCOLS_TERMFORCE_{NEVER,ALWAYS,AUTO} or a negative value in case of an error.
+ *
+ * Since: 2.29
+ */
+int scols_table_get_termforce(const struct libscols_table *tb)
+{
+	return tb->termforce;
+}
+
+/**
+ * scols_table_set_termwidth
+ * @tb: table
+ * @width: terminal width
+ *
+ * The library automatically detects terminal width or defaults to 80 chars if
+ * detections is unsuccessful. This function override this behaviour.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.29
+ */
+int scols_table_set_termwidth(struct libscols_table *tb, size_t width)
+{
+	DBG(TAB, ul_debugobj(tb, "set terminatl width: %zu", width));
+	tb->termwidth = width;
+	return 0;
+}
+
+/**
+ * scols_table_get_termwidth
+ * @tb: table
+ *
+ * Returns: terminal width.
+ */
+size_t scols_table_get_termwidth(const struct libscols_table *tb)
+{
+	return tb->termwidth;
+}
+
+/**
+ * scols_table_set_termheight
+ * @tb: table
+ * @height: terminal height (number of lines)
+ *
+ * The library automatically detects terminal height or defaults to 24 lines if
+ * detections is unsuccessful. This function override this behaviour.
+ *
+ * Returns: 0, a negative value in case of an error.
+ *
+ * Since: 2.31
+ */
+int scols_table_set_termheight(struct libscols_table *tb, size_t height)
+{
+	DBG(TAB, ul_debugobj(tb, "set terminatl height: %zu", height));
+	tb->termheight = height;
+	return 0;
+}
+
+/**
+ * scols_table_get_termheight
+ * @tb: table
+ *
+ * Returns: terminal height (number of lines).
+ *
+ * Since: 2.31
+ */
+size_t scols_table_get_termheight(const struct libscols_table *tb)
+{
+	return tb->termheight;
+}
diff --git a/libsmartcols/src/version.c b/libsmartcols/src/version.c
new file mode 100644
index 0000000..e592ccc
--- /dev/null
+++ b/libsmartcols/src/version.c
@@ -0,0 +1,62 @@
+/*
+ * version.c - Return the version of the library
+ *
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ *
+ * See COPYING.libmount for the License of this software.
+ */
+
+/**
+ * SECTION: version-utils
+ * @title: Version functions
+ * @short_description: functions to get the library version.
+ *
+ * Note that library version is not the same thing as SONAME version. The
+ * libsmarcols uses symbols versioning and SONAME is not modified for releases.
+ *
+ * The library version and symbols version follow util-linux package versioning.
+ */
+
+#include <ctype.h>
+
+#include "smartcolsP.h"
+
+static const char *lib_version = LIBSMARTCOLS_VERSION;
+
+/**
+ * scols_parse_version_string:
+ * @ver_string: version string (e.g "2.18.0")
+ *
+ * Returns: release version code.
+ */
+int scols_parse_version_string(const char *ver_string)
+{
+	const char *cp;
+	int version = 0;
+
+	assert(ver_string);
+
+	for (cp = ver_string; *cp; cp++) {
+		if (*cp == '.')
+			continue;
+		if (!isdigit(*cp))
+			break;
+		version = (version * 10) + (*cp - '0');
+	}
+	return version;
+}
+
+/**
+ * scols_get_library_version:
+ * @ver_string: return pointer to the static library version string if not NULL
+ *
+ * Returns: release version number.
+ */
+int scols_get_library_version(const char **ver_string)
+{
+	if (ver_string)
+		*ver_string = lib_version;
+
+	return scols_parse_version_string(lib_version);
+}
+
diff --git a/libsmartcols/src/walk.c b/libsmartcols/src/walk.c
new file mode 100644
index 0000000..0b51fed
--- /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;
+}