1 files changed, 24 insertions, 0 deletions
diff --git a/lib/libI77/rewind.c b/lib/libI77/rewind.c
new file mode 100644
index 0000000..e58daad7
--- /dev/null
+++ b/lib/libI77/rewind.c
@@ -0,0 +1,24 @@
+#include "f2c.h"
+#include "fio.h"
+#ifdef KR_headers
+integer f_rew(a) alist *a;
+#else
+integer f_rew(alist *a)
+#endif
+{
+	unit *b;
+	if(a->aunit>=MXUNIT || a->aunit<0)
+		err(a->aerr,101,"rewind");
+	b = &f__units[a->aunit];
+	if(b->ufd == NULL || b->uwrt == 3)
+		return(0);
+	if(!b->useek)
+		err(a->aerr,106,"rewind")
+	if(b->uwrt) {
+		(void) t_runc(a);
+		b->uwrt = 3;
+		}
+	rewind(b->ufd);
+	b->uend=0;
+	return(0);
+}