1 files changed, 34 insertions, 0 deletions
diff --git a/sys/fio/fmkpbbuf.x b/sys/fio/fmkpbbuf.x
new file mode 100644
index 00000000..ee891949
--- /dev/null
+++ b/sys/fio/fmkpbbuf.x
@@ -0,0 +1,34 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<config.h>
+include	<fio.h>
+
+# FMKPBBUF -- Make the push back buffer.  Called when the first attempt is
+# made to push data back into an input stream.
+
+procedure fmkpbbuf (fd)
+
+int	fd
+int	buflen
+pointer	bp
+errchk	malloc
+include	<fio.com>
+
+begin
+	fp = fiodes[fd]
+	if (bufptr[fd] == NULL)
+	    call fmkbfs (fd)
+
+	buflen = FPBBUFSIZE(fp)
+	if (buflen <= 0) {
+	    buflen = SZ_PBBUF
+	    FPBBUFSIZE(fp) = buflen
+	}
+
+	call malloc (bp, buflen, TY_CHAR)
+
+	FPBBUF(fp) = bp
+	FPBTOP(fp) = bp + buflen
+	FPBIOP(fp) = bp
+	FPBSP(fp) = (FPBTOP(fp) - 1) / SZ_INT + 1
+end