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	lsusb.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	lsusb.c (1132B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <limits.h>
	3 #include <stdio.h>
	4 #include <stdlib.h>
	5
	6 #include "text.h"
	7 #include "util.h"
	8
	9 static void
	10 lsusb(const char *file)
	11 {
	12 FILE *fp;
	13 char path[PATH_MAX];
	14 char *buf = NULL;
	15 size_t size = 0;
	16 unsigned int i = 0, busnum = 0, devnum = 0, pid = 0, vid = 0;
	17
	18 if (strlcpy(path, file, sizeof(path)) >= sizeof(path))
	19 eprintf("path too long\n");
	20 if (strlcat(path, "/uevent", sizeof(path)) >= sizeof(path))
	21 eprintf("path too long\n");
	22
	23 if (!(fp = fopen(path, "r")))
	24 return;
	25 while (agetline(&buf, &size, fp) != -1) {
	26 if (sscanf(buf, "BUSNUM=%u\n", &busnum) \|\|
	27 sscanf(buf, "DEVNUM=%u\n", &devnum) \|\|
	28 sscanf(buf, "PRODUCT=%x/%x/", &pid, &vid))
	29 i++;
	30 if (i == 3) {
	31 printf("Bus %03d Device %03d: ID %04x:%04x\n", b…
	32 pid, vid);
	33 break;
	34 }
	35 }
	36 if (ferror(fp))
	37 eprintf("%s: read error:", path);
	38 free(buf);
	39 fclose(fp);
	40 }
	41
	42 static void
	43 usage(void)
	44 {
	45 eprintf("usage: %s\n", argv0);
	46 }
	47
	48 int
	49 main(int argc, char *argv[])
	50 {
	51 ARGBEGIN {
	52 default:
	53 usage();
	54 } ARGEND;
	55
	56 recurse("/sys/bus/usb/devices", lsusb);
	57 return 0;
	58 }