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checkpointing utilities

This commit is contained in:
Stephen Crane 2014-11-14 18:27:54 +00:00
parent 4ff9f685f1
commit b7a9efe914
3 changed files with 38 additions and 0 deletions

29
checkpoint.cpp Normal file
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#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);
}

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checkpoint.h Normal file
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#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

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