Initial commit

1 files changed, 93 insertions, 0 deletions

diff --git a/pkg/tbtables/tbysiz.x b/pkg/tbtables/tbysiz.x
new file mode 100644
index 00000000..a5791258
--- /dev/null
+++ b/pkg/tbtables/tbysiz.x
@@ -0,0 +1,93 @@
+include <fset.h>
+include "tbtables.h"
+
+# tbysiz -- Y increase size
+# Change the space for column descriptors and/or the allocated number
+# of rows.  This is done by copying the table data file to a temporary
+# file, deleting the original table, and then renaming the temporary file
+# to the name of the original table.
+# The table must be open when this procedure is called.
+#
+# NOTE that the file channel number TB_FILE(tp) may be changed by this
+# procedure.  The values of TB_MAXCOLS, TB_ALLROWS and TB_COLUSED are
+# assumed to have been updated by a calling routine (e.g. tbcdef).
+#
+# Phil Hodge, 28-Aug-1987  Flush file buffer after calling tbtwsi.
+# Phil Hodge,  6-Nov-1987  Put temporary file in tmp.
+# Phil Hodge, 24-Mar-1988  Save and restore FIO buffer size.
+# Phil Hodge,  7-Mar-1989  Eliminate TB_CURROW.
+
+procedure tbysiz (tp, old_maxpar, old_maxcols,
+		old_ncols, old_allrows)
+
+pointer tp			# i: pointer to table descriptor
+int	old_maxpar		# i: previous value for max number of parmeters
+int	old_maxcols		# i: previous value for max number of columns
+int	old_ncols		# i: previous number of columns
+int	old_allrows		# i: previous value of allocated number of rows
+
+pointer sp
+pointer colptr			# scratch for array of column pointers
+int	k
+int	new_allrows		# = TB_ALLROWS(tp)
+int	iomode			# I/O mode for reopening the table
+int	oldfd, newfd		# Channel numbers for old & new table files
+int	bufsize			# save and restore FIO buffer size
+char	temp_file[SZ_FNAME]	# Name of temporary file for table data
+pointer tbcnum()
+int	open(), fstati()
+errchk	tbtwsi, tbyscp, mktemp, open, close, delete, rename, tbyscn, flush
+
+begin
+	# First check whether we really have to do anything.
+	if ((TB_MAXPAR(tp) == old_maxpar) && (TB_MAXCOLS(tp) == old_maxcols) &&
+	   ((TB_ALLROWS(tp) == old_allrows) || (old_ncols == 0)))
+	    return
+
+	oldfd = TB_FILE(tp)
+	if (oldfd == NULL)
+	    return
+	bufsize = fstati (oldfd, F_BUFSIZE)
+
+	new_allrows = TB_ALLROWS(tp)
+
+	call mktemp ("tmp$tbl", temp_file, SZ_FNAME)
+	newfd = open (temp_file, NEW_FILE, BINARY_FILE)
+
+	# Copy the contents of the table to the temporary file.
+	call tbyscp (tp, oldfd, newfd, old_maxpar,
+		old_maxcols, old_ncols, old_allrows)
+
+	# For each existing column, set all new rows to indef.
+	if ((new_allrows > old_allrows) && (old_ncols > 0)) {
+	    call smark (sp)
+	    call salloc (colptr, old_ncols, TY_INT)
+	    do k = 1, old_ncols
+		Memi[colptr+k-1] = tbcnum (tp, k)
+	    call tbyscn (tp, newfd, Memi[colptr], old_ncols,
+			old_allrows+1, new_allrows)
+	    call sfree (sp)
+	}
+
+	call close (oldfd)
+	call close (newfd)
+
+	# Delete the original table, and rename the temporary table to
+	# the same name as the original.
+	call delete (TB_NAME(tp))
+	call rename (temp_file, TB_NAME(tp))
+
+	# Reopen the new table.
+	if (TB_IOMODE(tp) == NEW_FILE)
+	    iomode = READ_WRITE
+	else
+	    iomode = TB_IOMODE(tp)
+	TB_FILE(tp) = open (TB_NAME(tp), iomode, BINARY_FILE)
+
+	# Restore whatever buffer size the old table had.
+	call fseti (TB_FILE(tp), F_BUFSIZE, bufsize)
+
+	# Update the size information record in the new table.
+	call tbtwsi (tp)			# write size information
+	call flush (TB_FILE(tp))
+end