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	new-acpi-battery.c - dwmstatus - A simple dwm status application in C.
	git clone git://git.suckless.org/dwmstatus
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	new-acpi-battery.c (867B)
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	1 char *
	2 readfile(char base, char file)
	3 {
	4 char *path, line[513];
	5 FILE *fd;
	6
	7 memset(line, 0, sizeof(line));
	8
	9 path = smprintf("%s/%s", base, file);
	10 fd = fopen(path, "r");
	11 if (fd == NULL) {
	12 perror("fopen");
	13 exit(1);
	14 }
	15 free(path);
	16
	17 if (fgets(line, sizeof(line)-1, fd) == NULL) {
	18 perror("fgets");
	19 exit(1);
	20 }
	21 fclose(fd);
	22
	23 return smprintf("%s", line);
	24 }
	25
	26 char *
	27 getbattery(char *base)
	28 {
	29 char *co;
	30 int descap, remcap;
	31
	32 descap = -1;
	33 remcap = -1;
	34
	35 co = readfile(base, "present");
	36 if (co[0] != '1') {
	37 free(co);
	38 return smprintf("not present");
	39 }
	40 free(co);
	41
	42 co = readfile(base, "charge_full_design");
	43 sscanf(co, "%d", &descap);
	44 free(co);
	45
	46 co = readfile(base, "charge_now");
	47 sscanf(co, "%d", &remcap);
	48 free(co);
	49
	50 if (remcap < 0 \|\| descap < 0)
	51 return smprintf("invalid");
	52
	53 return smprintf("%.0f", ((float)remcap / (float)descap) * 100);
	54 }
	55