1 files changed, 29 insertions, 0 deletions
diff --git a/sys/libc/ungetc.c b/sys/libc/ungetc.c
new file mode 100644
index 00000000..2773f4e1
--- /dev/null
+++ b/sys/libc/ungetc.c
@@ -0,0 +1,29 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+*/
+
+#define	import_spp
+#define	import_libc
+#define	import_xnames
+#define	import_stdio
+#include <iraf.h>
+
+
+/* UNGETC -- Push a character back into the input stream.  Pushback is last
+** in first out, i.e., the last character pushed back is the first one
+** read by GETC.  Characters (and strings) may be pushed back until the
+** FIO pushback buffer overflows.
+*/
+int
+ungetc (
+  int	ch,
+  FILE	*fp
+)
+{
+	XINT	x_fd = fileno(fp);
+	XCHAR	x_ch = ch;
+
+	iferr (UNGETC (&x_fd, &x_ch))
+	    return (EOF);
+	else
+	    return (ch);
+}