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comparison libuwrap/find_busdev.c @ 10:fd3fcba5a8ac

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libuwrap: implement locating by bus/dev
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 07 Sep 2023 04:18:30 +0000
parents libuwrap/find_matchspec.c@ab506f6aa57c
children
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9:ab506f6aa57c 10:fd3fcba5a8ac
1 /*
2 * In this module we implement the function that locates a USB device
3 * by bus and device number/filename strings.
4 */
5
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <string.h>
9 #include <strings.h>
10 #include <usb.h>
11 #include "find_dev.h"
12 #include "prelim_init.h"
13
14 struct usb_device *
15 find_usbdev_by_busdev(const char *bus_dev_spec)
16 {
17 const char *slash;
18 unsigned bus_name_len;
19 struct usb_bus *bus;
20 struct usb_device *dev;
21
22 slash = index(bus_dev_spec, '/');
23 if (!slash) {
24 fprintf(stderr,
25 "error: bus/dev path expected, but no slash found\n");
26 exit(1);
27 }
28 bus_name_len = slash - bus_dev_spec;
29 libusb_prelim_init();
30 for (bus = usb_get_busses(); bus; bus = bus->next) {
31 if (strlen(bus->dirname) != bus_name_len)
32 continue;
33 if (strncmp(bus->dirname, bus_dev_spec, bus_name_len))
34 continue;
35 for (dev = bus->devices; dev; dev = dev->next) {
36 if (!strcmp(dev->filename, slash + 1))
37 return dev;
38 }
39 }
40 return 0;
41 }