checkpointing utilities

checkpoint.cpp

@@ -0,0 +1,29 @@
+#include <SD.h>
+#include "sdtape.h"
+#include "checkpoint.h"
+#include "hardware.h"
+
+static char buf[32];
+static char chkpt[] = { "CHKPOINT" };
+static int cpid = 0;
+
+const char *checkpoint(sdtape &tape, const char *dir) {
+	tape.stop();
+	snprintf(buf, sizeof(buf), "%s%s.%03d", dir, chkpt, cpid++);
+	File file = SD.open(buf, O_WRITE | O_CREAT | O_TRUNC);
+	hardware_checkpoint(file);
+	file.close();
+	tape.start(dir);
+	return buf;
+}
+
+void restore(sdtape &tape, const char *dir, const char *filename) {
+	tape.stop();
+	snprintf(buf, sizeof(buf), "%s%s", dir, filename);
+	File file = SD.open(buf, O_READ);
+	hardware_restore(file);
+	file.close();
+	int n = sscanf(buf + strlen(dir), "%[A-Z0-9].%d", chkpt, &cpid);
+	cpid = (n == 1)? 0: cpid+1;
+	tape.start(dir);
+}

checkpoint.h

@@ -0,0 +1,8 @@
+#ifndef __CHECKPOINT_H__
+#define __CHECKPOINT_H__
+
+// utility checkpoint functions
+const char *checkpoint(sdtape &tape, const char *dir);
+void restore(sdtape &tape, const char *dir, const char *filename);
+
+#endif

r65emu.h

@@ -13,5 +13,6 @@
 #include "sdtape.h"
 #include "timed.h"
 #include "hardware.h"
+#include "checkpoint.h"
 
 #endif