Initial commit

1 files changed, 73 insertions, 0 deletions

diff --git a/src/modules/battery.c b/src/modules/battery.c
new file mode 100644
index 0000000..6c656fe
--- /dev/null
+++ b/src/modules/battery.c
@@ -0,0 +1,73 @@
+#include "battery.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <tgmath.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#define UPDATE_FREQUENCY 20
+
+static int
+open_battery_file(const char * name)
+{
+    char path[128];
+    snprintf(path, 128, "/sys/class/power_supply/BAT0/%s", name);
+    return open(path, O_RDONLY);
+}
+
+static int
+battery_value(int file)
+{
+    int val = 0;
+    char buf[16];
+
+    memset(&buf, '\0', 16);
+    lseek(file, 0, SEEK_SET);
+    read(file, &buf, sizeof(char) * 16);
+    sscanf(buf, "%d", &val);
+
+    return val;
+}
+
+struct battery *
+battery_new()
+{
+    struct battery * b = malloc(sizeof(struct battery));
+    int file = open_battery_file("charge_full");
+
+    b->full = battery_value(file);
+    b->file_current = open_battery_file("charge_now");
+    b->last_update = 0;
+
+    close(file);
+
+    return b;
+}
+
+void
+battery_free(struct battery * b)
+{
+    close(b->file_current);
+    free(b);
+}
+
+void battery_update(struct battery * b)
+{
+    int now;
+    float percentf;
+    int percent;
+    time_t now_time = time(NULL);
+
+    if((now_time - b->last_update) >= UPDATE_FREQUENCY) {
+        b->last_update = now_time;
+
+        now = battery_value(b->file_current);
+
+        percentf = (100.0f / b->full) * now;
+        percent = round(percentf);
+
+        snprintf(b->value, BATTERY_VALUE_SIZE, "%d%%", percent);
+    }
+}