1 files changed, 42 insertions, 0 deletions
diff --git a/sys/libc/cseek.c b/sys/libc/cseek.c
new file mode 100644
index 00000000..58cedcc3
--- /dev/null
+++ b/sys/libc/cseek.c
@@ -0,0 +1,42 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+*/
+
+#define import_spp
+#define	import_libc
+#define	import_xnames
+#define import_fset
+#include <iraf.h>
+
+
+/* C_SEEK -- FIO seek on a file.  If the actual file is a text file the
+** seek offset is assumed to have been obtained by a prior call to FTELL
+** and is passed on unchanged.  If the actual file is a binary file the
+** seek offset is a zero-indexed byte offset.  This offset is converted
+** to a one-indexed XCHAR offset; it is an error if the offset is not
+** aligned to an XCHAR word boundary.
+*/
+int
+c_seek (
+  XINT	fd,			/* FIO file descriptor		*/
+  long	offset			/* file offset			*/
+)
+{
+	XLONG	x_char_offset = offset;
+	XINT    x_fd = fd;
+	int	bypass;
+
+
+	bypass = (offset == BOFL || offset == EOFL
+		|| c_fstati (fd, F_TYPE) == TEXT_FILE);
+
+	if (!bypass) {
+	    x_char_offset /= sizeof(XCHAR);
+	    if ((x_char_offset++ * sizeof(XCHAR)) != offset)
+		return ((long) ERR);
+	}
+
+	iferr (SEEK (&x_fd, &x_char_offset))
+	    return (ERR);
+	else
+	    return (OK);
+}