Initial commit

1 files changed, 77 insertions, 0 deletions

diff --git a/pkg/tbtables/tbrdel.x b/pkg/tbtables/tbrdel.x
new file mode 100644
index 00000000..23796f15
--- /dev/null
+++ b/pkg/tbtables/tbrdel.x
@@ -0,0 +1,77 @@
+include <tbset.h>
+include "tbtables.h"
+include "tblerr.h"
+
+# tbrdel -- delete rows
+# This routine deletes a range of rows.
+# NOTE:  The number of rows TB_NROWS(tp) will be modified by this routine
+# if the range of rows to be deleted is within the table.  The physical
+# disk space occupied by these rows will not be deallocated; the file
+# will still be just as large as before.
+#
+# Phil Hodge, 23-Mar-1988  Subroutine created.
+# Phil Hodge,  3-Apr-1995  Set TB_MODIFIED to true.
+# Phil Hodge,  6-Mar-1998  Modify to allow a row selector, if the rows
+#			to be deleted are at the end of the table.
+
+procedure tbrdel (tp, firstrow, lastrow)
+
+pointer tp		# i: pointer to table descriptor
+int	firstrow	# i: first row to be deleted
+int	lastrow		# i: last row to be deleted
+#--
+int	row1		# actual first row to be deleted
+int	nrows		# number of rows written to table
+int	ndel		# number of rows to be deleted
+int	rst_rownum()
+errchk	tbxnll, tbynll, tbznll, tbfchp, tbrsft
+
+begin
+	if (firstrow < 1 || lastrow < 1)
+	    call error (1, "tbrdel:  Row number less than one is invalid.")
+
+	if (firstrow > lastrow)
+	    return
+
+	nrows = TB_NROWS(tp)
+
+	if (TB_ROW_SELECT(tp) == YES) {
+
+	    if (lastrow < TB_NSEL_ROWS(tp))
+		call error (1,
+	"Can't delete rows in the middle of a table that uses a row selector.")
+
+	    if (firstrow > TB_NSEL_ROWS(tp))
+		return				# nothing to do
+
+	    row1 = rst_rownum (TB_ROWSET(tp), firstrow)
+	    # and row2 = nrows
+
+	    if (nrows - row1 > TB_NSEL_ROWS(tp) - firstrow)
+		call error (1,
+	"tbrdel:  Range of rows to delete includes non-selected rows.")
+
+	    ndel = nrows - row1 + 1
+
+	    if (TB_TYPE(tp) == TBL_TYPE_S_ROW)
+		call tbxnll (tp, max (1, nrows-ndel+1), nrows)
+	    else if (TB_TYPE(tp) == TBL_TYPE_S_COL)
+		call tbynll (tp, max (1, nrows-ndel+1), nrows)
+	    else if (TB_TYPE(tp) == TBL_TYPE_TEXT)
+		call tbznll (tp, max (1, nrows-ndel+1), nrows)
+	    else if (TB_TYPE(tp) == TBL_TYPE_FITS)
+		call tbfchp (tp, ndel)
+	    else
+		call error (ER_TBCORRUPTED, "tbrdel:  invalid table type")
+
+	    TB_NROWS(tp) = max (0, nrows - ndel)
+
+	} else {
+
+	    ndel = min (nrows, lastrow) - firstrow + 1
+	    # Shift the rows.
+	    call tbrsft (tp, firstrow, -ndel)
+	}
+
+	TB_MODIFIED(tp) = true
+end