1 files changed, 39 insertions, 0 deletions
diff --git a/sys/mwcs/mwallocd.x b/sys/mwcs/mwallocd.x
new file mode 100644
index 00000000..96623015
--- /dev/null
+++ b/sys/mwcs/mwallocd.x
@@ -0,0 +1,39 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"mwcs.h"
+
+# MW_ALLOCD -- Allocate space in the data buffer.  The size of the buffer
+# is automatically increased if necessary.  Note that reallocation of the
+# buffer may cause it to move, hence all data items are referred to by their
+# offset in the buffer, rather than by an absolute pointer.
+
+int procedure mw_allocd (mw, nelem)
+
+pointer	mw		#I pointer to MWCS descriptor
+int	nelem		#I number of elements to alloc space for
+
+int	dbufused, dbuflen, offset
+errchk	realloc
+
+begin
+	dbufused = MI_DBUFUSED(mw)
+	dbuflen  = MI_DBUFLEN(mw)
+	offset   = dbufused + 1
+
+	# Increase buffer size?
+	if (dbufused + nelem > dbuflen) {
+	    dbuflen = dbuflen + INC_SZDBUF
+	    while (dbufused + nelem > dbuflen)
+		dbuflen = dbuflen + INC_SZDBUF
+
+	    call realloc (MI_DBUF(mw), dbuflen, TY_DOUBLE)
+	    call aclrd (D(mw,offset), dbuflen - offset + 1)
+	    MI_DBUFLEN(mw) = dbuflen
+	}
+
+	# Allocate the space in the buffer, and return the buffer offset
+	# of the allocated area.
+
+	MI_DBUFUSED(mw) = max (0, dbufused + nelem)
+	return (offset)
+end