1 files changed, 93 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..b57fe33
--- /dev/null
+++ b/main.c
@@ -0,0 +1,93 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef DEBUG
+#define DEBUG_LOG(e) printf("DEBUG: %s\n", e);
+#else
+#define DEBUG_LOG(e)
+#endif
+
+struct output_status {
+    char value[4];
+    float active_power;
+    float current;
+    float voltage;
+    float power_factor;
+    float energy_sum;
+};
+
+int parse_output(int id, struct output_status *ret);
+void print_output(struct output_status *status);
+
+int parse_output(int id, struct output_status *ret)
+{
+    int done;
+    FILE *fp;
+    char filename[13] = {0};
+
+    if (id > 9 || id < 1) {
+        DEBUG_LOG("Output identifier greater out of range");
+        return 1;
+    }
+
+    snprintf(filename, 12, "/dev/power%d", id);
+
+    fp = fopen(filename, "r");
+    if (fp == NULL) {
+        DEBUG_LOG("Error opening output device");
+        return 1;
+    }
+
+    done = fscanf(fp, "%s %f\n %f\n %f\n %f\n %f",
+                      ret->value, &ret->active_power,
+                      &ret->current, &ret->voltage,
+                      &ret->power_factor, &ret->energy_sum);
+    fclose(fp);
+
+    if (done != 6) {
+        DEBUG_LOG("parse_output did not receive enough fields");
+        return 1;
+    }
+
+    return 0;
+}
+
+void print_output(struct output_status *status)
+{
+    printf("Value: %s\n", status->value);
+    printf("Active Power: %f\n", status->active_power);
+    printf("Current: %f\n", status->current);
+    printf("Voltage: %f\n", status->voltage);
+    printf("Power Factor: %f\n", status->power_factor);
+    printf("Energy Sum: %f\n", status->energy_sum);
+}
+
+int main(int argc, char **argv)
+{
+    int ret;
+    int output;
+    struct output_status status;
+
+    memset(&status, 0, sizeof(status));
+
+    if (argc != 2) {
+        printf("Pass output number\n");
+        return 1;
+    }
+
+    output = atoi(argv[1]);
+    if (output > 9 || output <= 0) {
+        printf("Output out of range\n");
+        return 1;
+    }
+
+    if ((ret = parse_output(output, &status)) != 0) {
+        printf("Failed to parse output\n");
+        return 1;
+    }
+
+    print_output(&status);
+
+    return 0;
+}