1 files changed, 79 insertions, 0 deletions
diff --git a/src/nio.h b/src/nio.h
new file mode 100644
index 0000000..df992a2
--- /dev/null
+++ b/src/nio.h
@@ -0,0 +1,79 @@
+/**
+ * N: I/O
+ */
+
+#ifndef NIO_H
+#define NIO_H
+
+#define DFUJI   0x71
+#define DREAD   0x40
+#define DWRITE  0x80
+#define DUPDATE 0xC0
+
+#define OREAD   0x04
+#define OWRITE  0x08
+#define OUPDATE 0x0C
+
+#define SUCCESS 1
+#define DERROR  144
+
+#define DVSTAT_BYTES_WATING_LO  0
+#define DVSTAT_BYTES_WATING_HI  1
+#define DVSTAT_PROTOCOL		    2 
+#define DVSTAT_EXTENDED_ERROR	3
+
+/**
+ * Open N: device with devicespec
+ * @param devicespec - an N: device spec, e.g. N:TCP://FOO.COM:1234/
+ * @param translation mode, 0=none, 1=cr, 2=lf, 3=cr/lf
+ * @return error code, or 1 if successful.
+ */
+unsigned char nopen(char* devicespec, unsigned char trans);
+
+/**
+ * Close N: device with devicespec
+ * @param devicespec - an N: device spec to close (the unit number is extracted)
+ * @return error code, or 1 if successful.
+ */
+unsigned char nclose(char* devicespec);
+
+/**
+ * Get status of specific N: device
+ * @param devicespec - an N: device spec to status (the unit number is extracted)
+ * @return error code, or 1 if successful, DVSTAT is also filled with status info.
+ *
+ * Format of DVSTAT:
+ * OS.dcb.dvstat[0] = # of bytes waiting LO
+ * OS.dcb.dvstat[1] = # of bytes waiting HI
+ * OS.dcb.dvstat[2] = reserved
+ * OS.dcb.dvstat[3] = Error code of last I/O operation. !1 = error.
+ */
+unsigned char nstatus(char* devicespec);
+
+/**
+ * Read # of bytes from specific N: device.
+ * @param devicespec - an N: device spec to read bytes from.
+ * @param buf - The buffer to read into, must be at least as big as len.
+ * @param len - The # of bytes to read (up to 65535)
+ * @return error code, or 1 if successful, buf is filled with data.
+ */
+unsigned char nread(char* devicespec, unsigned char* buf, unsigned short len);
+
+/**
+ * Write # of bytes to specific N: device.
+ * @param devicespec - an N: device spec to write to.
+ * @param buf - The buffer to write to device, should be at least as big as len.
+ * @param len - The # of bytes to write (up to 65535)
+ * @return error code, or 1 if successful, buf is filled with data.
+ */
+unsigned char nwrite(char* devicespec, unsigned char* buf, unsigned short len);
+
+/**
+ * Send username and password credentials
+ * @param devicespec - The devicespec.
+ * @param login - The username to send
+ * @param password - The password to send
+ */
+unsigned char nlogin(char* devicespec, char* login, char* password);
+
+#endif /* NIO_H */