/* vi: set sw=4 ts=4: */
/*
 * lsusb implementation for busybox
 *
 * Copyright (C) 2009  Malek Degachi <malek-degachi@laposte.net>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */
//config:config LSUSB
//config:	bool "lsusb (4.4 kb)"
//config:	default y
//config:	help
//config:	lsusb is a utility for displaying information about USB buses in the
//config:	system and devices connected to them.
//config:
//config:	This version uses sysfs (/sys/bus/usb/devices) only.

//applet:IF_LSUSB(APPLET_NOEXEC(lsusb, lsusb, BB_DIR_USR_BIN, BB_SUID_DROP, lsusb))

//kbuild:lib-$(CONFIG_LSUSB) += lsusb.o

//usage:#define lsusb_trivial_usage NOUSAGE_STR
//usage:#define lsusb_full_usage ""

#include "libbb.h"

static char * FAST_FUNC add_sysfs_prop(const char *dir, const char *suffix,
		char *buf, size_t size)
{
	char *filename;
	ssize_t len;

	filename = concat_path_file(dir, suffix);
	len = open_read_close(filename, buf, size - 1);
	free(filename);

	if (len < 0)
		len = 0;

	buf[len] = '\0';

	return trim(buf);
}

static int FAST_FUNC fileAction(struct recursive_state *state UNUSED_PARAM,
		const char *fileName,
		struct stat *statbuf UNUSED_PARAM)
{
	parser_t *parser;
	char *tokens[4];
	char *busnum = NULL, *devnum = NULL;
	int product_vid = 0, product_did = 0;
	char *uevent_filename = concat_path_file(fileName, "uevent");

	parser = config_open2(uevent_filename, fopen_for_read);
	free(uevent_filename);

	while (config_read(parser, tokens, 4, 2, "\\/=", PARSE_NORMAL)) {
		if ((parser->lineno == 1) && strcmp(tokens[0], "DEVTYPE") == 0) {
			break;
		}

		if (strcmp(tokens[0], "PRODUCT") == 0) {
			product_vid = xstrtou(tokens[1], 16);
			product_did = xstrtou(tokens[2], 16);
			continue;
		}

		if (strcmp(tokens[0], "BUSNUM") == 0) {
			busnum = xstrdup(tokens[1]);
			continue;
		}

		if (strcmp(tokens[0], "DEVNUM") == 0) {
			devnum = xstrdup(tokens[1]);
			continue;
		}
	}
	config_close(parser);

	if (busnum) {
		char name[256], *p;

		p = add_sysfs_prop(fileName, "/manufacturer", name, sizeof(name) - 1);
		if (p != name)
			p = stpcpy(p, " ");
		add_sysfs_prop(fileName, "/product", p, name + sizeof(name) - p);

		printf("Bus %s Device %s: ID %04x:%04x %s\n", busnum, devnum,
		       product_vid, product_did, name);
		free(busnum);
		free(devnum);
	}

	return TRUE;
}

int lsusb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int lsusb_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
	/* no options, no getopt */

	recursive_action("/sys/bus/usb/devices",
			ACTION_RECURSE,
			fileAction,
			NULL, /* dirAction */
			NULL /* userData */
	);

	return EXIT_SUCCESS;
}
