improved sensor log format

[psensor.git] / src / lib / slog.c

diff --git a/src/lib/slog.c b/src/lib/slog.c
index f1b2f5b..aed2a5b 100644 (file)
--- a/src/lib/slog.c
+++ b/src/lib/slog.c
@@ -21,14 +21,17 @@
 #define _(str) gettext(str)
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/time.h>
 
+#include "bool.h"
 #include "config.h"
 #include "log.h"
 #include "slog.h"
 
 static FILE *file;
 static struct timeval stv;
+static double *last_values;
 
 int slog_init(const char *path, struct psensor **sensors)
 {
@@ -47,7 +50,7 @@ int slog_init(const char *path, struct psensor **sensors)
        fprintf(file, "I,%ld,%s\n", stv.tv_sec, VERSION);
 
        while (*sensors) {
-               fprintf(file, "S,%s\n", (*sensors)->id);
+               fprintf(file, "S,%s,%x\n", (*sensors)->id,  (*sensors)->type);
                sensors++;
        }
 
@@ -56,9 +59,14 @@ int slog_init(const char *path, struct psensor **sensors)
        return 1;
 }
 
+
+
 void slog_write_sensors(struct psensor **sensors)
 {
+       int count, i;
+       double v;
        struct timeval tv;
+       bool first_call;
 
        if (!file)
                return ;
@@ -68,11 +76,27 @@ void slog_write_sensors(struct psensor **sensors)
                return ;
        }
 
-       fprintf(file, "M,%ld", tv.tv_sec - stv.tv_sec);
-       while (*sensors) {
-               fprintf(file, ",%.1f", psensor_get_current_value(*sensors));
-               sensors++;
+       count = psensor_list_size(sensors);
+
+       if (last_values) {
+               first_call = 0;
+       } else {
+               first_call = 1;
+               last_values = malloc(count * sizeof(double));
        }
+
+       fprintf(file, "%ld", tv.tv_sec - stv.tv_sec);
+       for (i = 0; i < count; i++) {
+               v = psensor_get_current_value(sensors[i]);
+
+               if (!first_call && last_values[i] == v)
+                       fputc(',', file);
+               else
+                       fprintf(file, ",%.1f", v);
+
+               last_values[i] = v;
+       }
+
        fputc('\n', file);
 
        fflush(file);
@@ -80,6 +104,10 @@ void slog_write_sensors(struct psensor **sensors)
 
 void slog_close()
 {
-       if (file)
+       if (file) {
                fclose(file);
+               file = NULL;
+               free(last_values);
+               last_values = NULL;
+       }
 }