ubase

suckless linux base utils
git clone git://git.2f30.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", busnum, devnum,
     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 }