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	new-acpi-battery.c (1208B)
	---
	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 return NULL;
	13 free(path);
	14
	15 if (fgets(line, sizeof(line)-1, fd) == NULL)
	16 return NULL;
	17 fclose(fd);
	18
	19 return smprintf("%s", line);
	20 }
	21
	22 /*
	23 * Linux seems to change the filenames after suspend/hibernate
	24 * according to a random scheme. So just check for both possibilities.
	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 == NULL \|\| co[0] != '1') {
	37 if (co != NULL) free(co);
	38 return smprintf("not present");
	39 }
	40 free(co);
	41
	42 co = readfile(base, "charge_full_design");
	43 if (co == NULL) {
	44 co = readfile(base, "energy_full_design");
	45 if (co == NULL)
	46 return smprintf("");
	47 }
	48 sscanf(co, "%d", &descap);
	49 free(co);
	50
	51 co = readfile(base, "charge_now");
	52 if (co == NULL) {
	53 co = readfile(base, "energy_now");
	54 if (co == NULL)
	55 return smprintf("");
	56 }
	57 sscanf(co, "%d", &remcap);
	58 free(co);
	59
	60 if (remcap < 0 \|\| descap < 0)
	61 return smprintf("invalid");
	62
	63 return smprintf("%.0f", ((float)remcap / (float)descap) * 100);
	64 }
	65