morpheus-base

morpheus base system
git clone git://git.2f30.org/morpheus-base.git
Log | Files | Refs

lsusb.c (1170B)


      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 lsusb(const char *file);
     10 
     11 static void
     12 usage(void)
     13 {
     14 	eprintf("usage: %s\n", argv0);
     15 }
     16 
     17 int
     18 main(int argc, char *argv[])
     19 {
     20 	ARGBEGIN {
     21 	default:
     22 		usage();
     23 	} ARGEND;
     24 
     25 	recurse("/sys/bus/usb/devices", lsusb);
     26 	return 0;
     27 }
     28 
     29 static void
     30 lsusb(const char *file)
     31 {
     32 	FILE *fp;
     33 	char path[PATH_MAX];
     34 	char *buf = NULL;
     35 	size_t size = 0;
     36 	unsigned int i = 0, busnum = 0, devnum = 0, pid = 0, vid = 0;
     37 
     38 	if (strlcpy(path, file, sizeof(path)) >= sizeof(path))
     39 		eprintf("path too long\n");
     40 	if (strlcat(path, "/uevent", sizeof(path)) >= sizeof(path))
     41 		eprintf("path too long\n");
     42 
     43 	if (!(fp = fopen(path, "r")))
     44 		return;
     45 	while (agetline(&buf, &size, fp) != -1) {
     46 		if (sscanf(buf, "BUSNUM=%u\n", &busnum) ||
     47 		    sscanf(buf, "DEVNUM=%u\n", &devnum) ||
     48 		    sscanf(buf, "PRODUCT=%x/%x/", &pid, &vid))
     49 			i++;
     50 		if (i == 3) {
     51 			printf("Bus %03d Device %03d: ID %04x:%04x\n", busnum, devnum,
     52 			       pid, vid);
     53 			break;
     54 		}
     55 	}
     56 	if (ferror(fp))
     57 		eprintf("%s: read error:", path);
     58 	free(buf);
     59 	fclose(fp);
     60 }