Initial commit.

[dwm-status] / new-acpi-battery.c

char *
readfile(char *base, char *file)
{
       char *path, line[513];
       FILE *fd;

       memset(line, 0, sizeof(line));

       path = smprintf("%s/%s", base, file);
       fd = fopen(path, "r");
       if (fd == NULL) {
               perror("fopen");
               exit(1);
       }
       free(path);

       if (fgets(line, sizeof(line)-1, fd) == NULL) {
               perror("fgets");
               exit(1);
       }
       fclose(fd);

       return smprintf("%s", line);
}

char *
getbattery(char *base)
{
       char *co;
       int descap, remcap;

       descap = -1;
       remcap = -1;

       co = readfile(base, "present");
       if (co[0] != '1') {
               free(co);
               return smprintf("not present");
       }
       free(co);

       co = readfile(base, "charge_full_design");
       sscanf(co, "%d", &descap);
       free(co);

       co = readfile(base, "charge_now");
       sscanf(co, "%d", &remcap);
       free(co);

       if (remcap < 0 || descap < 0)
               return smprintf("invalid");

       return smprintf("%.0f", ((float)remcap / (float)descap) * 100);
}