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#define _GNU_SOURCE
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include <err.h>
static char SYSPATH[] = "/sys/class/power_supply/BAT0/";
static char charging[] = "↯";
static char *readline(char *dir, char *file)
{
static char *line = NULL;
static size_t nbytes = 0;
char path[512];
ssize_t n;
FILE *fp;
if (! dir && ! file) {
free(line);
return line = NULL;
}
snprintf(path, sizeof(path), "%s%s", dir, file);
if (! (fp = fopen(path, "r"))) {
warn("fopen %s", path);
_exit(1);
}
if ((n = getline(&line, &nbytes, fp)) < 0) {
warn("getline");
_exit(1);
}
fclose(fp);
assert(line);
if (n && line[n - 1] == '\n')
line[n - 1] = '\0';
return line;
}
static int isdir(const char *path)
{
struct stat st;
return ! stat(path, &st) && S_ISDIR(st.st_mode);
}
static void print_battery_status(void)
{
#define PRINT(...) str += snprintf(str, sizeof(status) - (str - status), __VA_ARGS__)
static char status[512];
char *str = status;
if (! isdir(SYSPATH))
return;
if (! strcasecmp("charging", readline(SYSPATH, "status")))
PRINT("%s ", charging);
int capacity = atoi(readline(SYSPATH, "capacity"));
if (capacity == 100)
PRINT("full");
else
PRINT("%d%%", capacity);
printf(", bat: %s", status);
readline(NULL, NULL);
}
int main(int argc, char *argv[])
{
struct sysinfo si;
if (sysinfo(&si) < 0)
return 1;
printf("used: %ld", (si.totalram - si.freeram) * si.mem_unit >> 20);
printf(", free: %ld", si.freeram * si.mem_unit >> 20);
#if 0
printf(", swap: %d", (si.totalswap - si.freeswap) * si.mem_unit >> 10);
#endif
printf(", procs: %d", si.procs);
print_battery_status();
printf("\n");
return 0;
}
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