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	batterystatus.c (1218B)
	---
	1 #define BATT_NOW "/sys/class/power_supply/BAT0/charge_now"
	2 #define BATT_FULL "/sys/class/power_supply/BAT0/charge_full"
	3 #define BATT_STATUS "/sys/class/power_supply/BAT0/status"
	4
	5 #include <stdio.h>
	6 #include <stdlib.h>
	7 #include <string.h>
	8 #include <errno.h>
	9
	10 char *
	11 smprintf(char *fmt, ...)
	12 {
	13 va_list fmtargs;
	14 char *buf = NULL;
	15
	16 va_start(fmtargs, fmt);
	17 if (vasprintf(&buf, fmt, fmtargs) == -1){
	18 fprintf(stderr, "malloc vasprintf\n");
	19 exit(1);
	20 }
	21 va_end(fmtargs);
	22
	23 return buf;
	24 }
	25
	26 char *
	27 getbattery(){
	28 long lnum1, lnum2 = 0;
	29 char status = malloc(sizeof(char)12);
	30 char s = '?';
	31 FILE *fp = NULL;
	32 if ((fp = fopen(BATT_NOW, "r"))) {
	33 fscanf(fp, "%ld\n", &lnum1);
	34 fclose(fp);
	35 fp = fopen(BATT_FULL, "r");
	36 fscanf(fp, "%ld\n", &lnum2);
	37 fclose(fp);
	38 fp = fopen(BATT_STATUS, "r");
	39 fscanf(fp, "%s\n", status);
	40 fclose(fp);
	41 if (strcmp(status,"Charging") == 0)
	42 s = '+';
	43 if (strcmp(status,"Discharging") == 0)
	44 s = '-';
	45 if (strcmp(status,"Full") == 0)
	46 s = '=';
	47 return smprintf("%c%ld%%", s,(lnum1/(lnum2/100)));
	48 }
	49 else return smprintf("");
	50 }
	51
	52
	53