1 files changed, 93 insertions, 0 deletions
diff --git a/arch/um/drivers/slip_proto.h b/arch/um/drivers/slip_proto.h
new file mode 100644
index 00000000000..7206361ace4
--- /dev/null
+++ b/arch/um/drivers/slip_proto.h
@@ -0,0 +1,93 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_SLIP_PROTO_H__
+#define __UM_SLIP_PROTO_H__
+
+/* SLIP protocol characters. */
+#define SLIP_END             0300	/* indicates end of frame	*/
+#define SLIP_ESC             0333	/* indicates byte stuffing	*/
+#define SLIP_ESC_END         0334	/* ESC ESC_END means END 'data'	*/
+#define SLIP_ESC_ESC         0335	/* ESC ESC_ESC means ESC 'data'	*/
+
+static inline int slip_unesc(unsigned char c,char *buf,int *pos, int *esc)
+{
+	int ret;
+
+	switch(c){
+	case SLIP_END:
+		*esc = 0;
+		ret=*pos;
+		*pos=0;
+		return(ret);
+	case SLIP_ESC:
+		*esc = 1;
+		return(0);
+	case SLIP_ESC_ESC:
+		if(*esc){
+			*esc = 0;
+			c = SLIP_ESC;
+		}
+		break;
+	case SLIP_ESC_END:
+		if(*esc){
+			*esc = 0;
+			c = SLIP_END;
+		}
+		break;
+	}
+	buf[(*pos)++] = c;
+	return(0);
+}
+
+static inline int slip_esc(unsigned char *s, unsigned char *d, int len)
+{
+	unsigned char *ptr = d;
+	unsigned char c;
+
+	/*
+	 * Send an initial END character to flush out any
+	 * data that may have accumulated in the receiver
+	 * due to line noise.
+	 */
+
+	*ptr++ = SLIP_END;
+
+	/*
+	 * For each byte in the packet, send the appropriate
+	 * character sequence, according to the SLIP protocol.
+	 */
+
+	while (len-- > 0) {
+		switch(c = *s++) {
+		case SLIP_END:
+			*ptr++ = SLIP_ESC;
+			*ptr++ = SLIP_ESC_END;
+			break;
+		case SLIP_ESC:
+			*ptr++ = SLIP_ESC;
+			*ptr++ = SLIP_ESC_ESC;
+			break;
+		default:
+			*ptr++ = c;
+			break;
+		}
+	}
+	*ptr++ = SLIP_END;
+	return (ptr - d);
+}
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */