1 files changed, 37 insertions, 0 deletions
diff --git a/sys/fio/fstdfile.x b/sys/fio/fstdfile.x
new file mode 100644
index 00000000..b3f570a9
--- /dev/null
+++ b/sys/fio/fstdfile.x
@@ -0,0 +1,37 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# FSTDFILE -- Determine if the named file is a standard stream, and if so,
+# return its file descriptor.
+
+int procedure fstdfile (fname, ofd)
+
+char	fname[ARB]
+int	ofd
+bool	streq()
+
+begin
+	ofd = NULL
+
+	if (fname[1] != 'S' || fname[2] != 'T') {
+	    return (NO)
+	} else if (streq (fname, "STDIN")) {
+	    ofd = STDIN
+	    return (YES)
+	} else if (streq (fname, "STDOUT")) {
+	    ofd = STDOUT
+	    return (YES)
+	} else if (streq (fname, "STDERR")) {
+	    ofd = STDERR
+	    return (YES)
+	} else if (streq (fname, "STDGRAPH")) {
+	    ofd = STDGRAPH
+	    return (YES)
+	} else if (streq (fname, "STDIMAGE")) {
+	    ofd = STDIMAGE
+	    return (YES)
+	} else if (streq (fname, "STDPLOT")) {
+	    ofd = STDPLOT
+	    return (YES)
+	} else
+	    return (NO)
+end