[khatus.git] / x5 / khatus_sensor_battery.c

#include <signal.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "khatus_lib_log.h"
#include "khatus_lib_time.h"

#define usage(...) {print_usage(); fprintf(stderr, "Error:\n    " __VA_ARGS__); exit(EXIT_FAILURE);}

#define MAX_LEN 20

char *argv0;

double  opt_interval = 1.0;
char   *opt_battery  = "BAT0";

void
print_usage()
{
	printf(
	    "%s: [OPT ...]\n"
	    "\n"
	    "OPT = -i int     # interval\n"
	    "    | -b string  # battery file name from /sys/class/power_supply/\n"
	    "    | -h         # help message (i.e. what you're reading now :) )\n",
	    argv0);
}

void
opt_parse(int argc, char **argv)
{
	char c;

	while ((c = getopt(argc, argv, "b:i:h")) != -1)
		switch (c) {
		case 'b':
			opt_battery = calloc(strlen(optarg), sizeof(char));
			strcpy(opt_battery, optarg);
			break;
		case 'i':
			opt_interval = atof(optarg);
			break;
		case 'h':
			print_usage();
			exit(EXIT_SUCCESS);
		case '?':
			if (optopt == 'b' || optopt == 'i')
				fprintf(stderr,
					"Option -%c requires an argument.\n",
					optopt);
			else if (isprint(optopt))
				fprintf (stderr,
					"Unknown option `-%c'.\n",
					optopt);
			else
				fprintf(stderr,
					"Unknown option character `\\x%x'.\n",
					optopt);
			exit(EXIT_FAILURE);
		default:
			assert(0);
		}
}

int
get_capacity(char *buf, char *path)
{
	FILE *fp;
	int cap;

	if (!(fp = fopen(path, "r")))
		fatal("Failed to open %s. errno: %d, msg: %s\n",
		    path, errno, strerror(errno));

	switch (fscanf(fp, "%d", &cap)) {
	case -1: fatal("EOF\n");
	case  0: fatal("Read 0\n");
	case  1: break;
	default: assert(0);
	}
	fclose(fp);
	return snprintf(buf, 6, "%3d%%", cap);
}

int
main(int argc, char **argv)
{
	argv0 = argv[0];

	char  buf[10];
	char path[PATH_MAX];
	char *path_fmt = "/sys/class/power_supply/%s/capacity";
	struct timespec ti;

	opt_parse(argc, argv);
	ti = timespec_of_float(opt_interval);
	debug("opt_battery: \"%s\"\n", opt_battery);
	debug("opt_interval: %f\n", opt_interval);
	debug("ti: {tv_sec = %ld, tv_nsec = %ld}\n", ti.tv_sec, ti.tv_nsec);
	memset(path, '\0', PATH_MAX);
	snprintf(path, PATH_MAX, path_fmt, opt_battery);
	signal(SIGPIPE, SIG_IGN);

	for (;;) {
		get_capacity(buf, path);
		puts(buf);
		fflush(stdout);
		snooze(&ti);
	}
	return EXIT_SUCCESS;
}
Commit	Line	Data
521d3106	1	#include <signal.h>
d03cabfe SK	2	#include <assert.h>
	3	#include <ctype.h>
	4	#include <errno.h>
d03cabfe	5	#include <limits.h>
521d3106	6	#include <signal.h>
d03cabfe SK	7	#include <stdio.h>
	8	#include <stdlib.h>
	9	#include <string.h>
	10	#include <time.h>
	11	#include <unistd.h>
	12
	13	#include "khatus_lib_log.h"
	14	#include "khatus_lib_time.h"
	15
	16	#define usage(...) {print_usage(); fprintf(stderr, "Error:\n " __VA_ARGS__); exit(EXIT_FAILURE);}
	17
	18	#define MAX_LEN 20
d03cabfe SK	19
	20	char *argv0;
	21
d03cabfe SK	22	double opt_interval = 1.0;
d03cabfe SK	23	char *opt_battery = "BAT0";
d03cabfe SK	24
	25	void
	26	print_usage()
	27	{
	28	printf(
521d3106	29	"%s: [OPT ...]\n"
d03cabfe	30	"\n"
d03cabfe SK	31	"OPT = -i int # interval\n"
	32	" \| -b string # battery file name from /sys/class/power_supply/\n"
	33	" \| -h # help message (i.e. what you're reading now :) )\n",
	34	argv0);
	35	}
	36
	37	void
	38	opt_parse(int argc, char **argv)
	39	{
	40	char c;
	41
521d3106	42	while ((c = getopt(argc, argv, "b:i:h")) != -1)
d03cabfe	43	switch (c) {
521d3106	44	case 'b':
d03cabfe SK	45	opt_battery = calloc(strlen(optarg), sizeof(char));
	46	strcpy(opt_battery, optarg);
	47	break;
	48	case 'i':
	49	opt_interval = atof(optarg);
	50	break;
	51	case 'h':
	52	print_usage();
	53	exit(EXIT_SUCCESS);
	54	case '?':
521d3106	55	if (optopt == 'b' \|\| optopt == 'i')
d03cabfe SK	56	fprintf(stderr,
	57	"Option -%c requires an argument.\n",
	58	optopt);
	59	else if (isprint(optopt))
	60	fprintf (stderr,
	61	"Unknown option `-%c'.\n",
	62	optopt);
	63	else
	64	fprintf(stderr,
	65	"Unknown option character `\\x%x'.\n",
	66	optopt);
	67	exit(EXIT_FAILURE);
	68	default:
	69	assert(0);
	70	}
d03cabfe SK	71	}
d03cabfe SK	72
d03cabfe	73	int
fa2a9b44	74	get_capacity(char buf, char path)
d03cabfe SK	75	{
	76	FILE *fp;
	77	int cap;
	78
	79	if (!(fp = fopen(path, "r")))
	80	fatal("Failed to open %s. errno: %d, msg: %s\n",
	81	path, errno, strerror(errno));
	82
	83	switch (fscanf(fp, "%d", &cap)) {
	84	case -1: fatal("EOF\n");
	85	case 0: fatal("Read 0\n");
	86	case 1: break;
	87	default: assert(0);
	88	}
	89	fclose(fp);
521d3106	90	return snprintf(buf, 6, "%3d%%", cap);
d03cabfe SK	91	}
	92
	93	int
	94	main(int argc, char **argv)
	95	{
	96	argv0 = argv[0];
	97
	98	char buf[10];
fa2a9b44	99	char path[PATH_MAX];
d03cabfe	100	char *path_fmt = "/sys/class/power_supply/%s/capacity";
521d3106	101	struct timespec ti;
d03cabfe SK	102
d03cabfe SK	103	opt_parse(argc, argv);
521d3106 SK	104	ti = timespec_of_float(opt_interval);
	105	debug("opt_battery: \"%s\"\n", opt_battery);
	106	debug("opt_interval: %f\n", opt_interval);
	107	debug("ti: {tv_sec = %ld, tv_nsec = %ld}\n", ti.tv_sec, ti.tv_nsec);
d03cabfe SK	108	memset(path, '\0', PATH_MAX);
d03cabfe SK	109	snprintf(path, PATH_MAX, path_fmt, opt_battery);
521d3106 SK	110	signal(SIGPIPE, SIG_IGN);
	111
	112	for (;;) {
	113	get_capacity(buf, path);
	114	puts(buf);
	115	fflush(stdout);
	116	snooze(&ti);
	117	}
	118	return EXIT_SUCCESS;
d03cabfe	119	}