From: ian <ian>
Date: Tue, 18 Jan 2005 23:57:59 +0000 (+0000)
Subject: new embryonic program "safety"
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ijackson/git?a=commitdiff_plain;h=1faeb453191a380159db0150d5f4f96a65cd6c7d;p=trains.git

new embryonic program "safety"
---

diff --git a/hostside/.cvsignore b/hostside/.cvsignore
index e8f16d8..92602c0 100644
--- a/hostside/.cvsignore
+++ b/hostside/.cvsignore
@@ -1,2 +1,3 @@
 hostside
+safety
 t
diff --git a/hostside/Makefile b/hostside/Makefile
index 462818a..bee9442 100644
--- a/hostside/Makefile
+++ b/hostside/Makefile
@@ -1,6 +1,6 @@
 #
 
-TARGETS=	hostside
+TARGETS=	hostside safety
 CFLAGS=		-Wall -Werror -Wstrict-prototypes -Wmissing-prototypes \
 		-Wpointer-arith -Wwrite-strings -g $(OPTIMISE)
 OPTIMISE=	-O2
@@ -14,5 +14,7 @@ encode.o:	nmra-packets.h
 main.o:		nmra-packets.h
 %.c:		hostside.h
 
+safety.o:	safety.h layoutinfo.h
+
 clean:
 		rm -f *.o $(TARGETS)
diff --git a/hostside/layoutinfo.h b/hostside/layoutinfo.h
new file mode 100644
index 0000000..60424e8
--- /dev/null
+++ b/hostside/layoutinfo.h
@@ -0,0 +1,4 @@
+/* will be autogenerated at some point */
+
+#define NUM_TRAINS 2
+#define NUM_SEGMENTS 100
diff --git a/hostside/safety.c b/hostside/safety.c
new file mode 100644
index 0000000..b0a2db0
--- /dev/null
+++ b/hostside/safety.c
@@ -0,0 +1,10 @@
+/**/
+
+#include <stdio.h>
+
+#include "safety.h"
+
+int main(void) {
+  printf("%d\n",(int)sizeof(State));
+  return 0;
+}
diff --git a/hostside/safety.h b/hostside/safety.h
new file mode 100644
index 0000000..3eb460b
--- /dev/null
+++ b/hostside/safety.h
@@ -0,0 +1,29 @@
+/**/
+
+#ifndef SAFETY_H
+#define SAFETY_H
+
+typedef unsigned short TrainIx;
+typedef unsigned short SegmentIx;
+
+typedef struct {
+  SegmentIx foremost;
+  unsigned justarrived:1, reverse:1;
+  unsigned char speed; /* non-negative, units of 4mm/s */
+} Train;
+
+typedef struct {
+  unsigned present_now:1, present_future:1,
+    detectable_now:1, detectable_future:1;
+  TrainIx owner;
+  /*polarity?*/
+} Segment;
+
+#include "layoutinfo.h"
+
+typedef struct {
+  Train trains[NUM_TRAINS];
+  Segment segments[NUM_SEGMENTS];
+} State;
+
+#endif /*SAFETY_H*/