#include <stdio.h>
#include <stdlib.h>
#include "libusb.h"

typedef struct libusb_device_descriptor libusb_device_descriptor;
typedef struct libusb_device_handle libusb_device_handle;

void printdev(libusb_device *dev) {
    libusb_device_descriptor desc;

    int res;
    res = libusb_get_device_descriptor(dev, &desc);
    if (res < 0) {
        printf("failed to get device descriptor\n");
        return;
    }

    printf("Vendor ID: %u Product ID: %u\n", desc.idVendor, desc.idProduct);

    libusb_device_handle *handle;
    res = libusb_open(dev, &handle);
    if (res < 0) {
        printf("failed to open\n");
        return;
    }

    if (desc.iManufacturer > 0) {
        unsigned char buf[256];

        res = libusb_get_string_descriptor_ascii(handle, desc.iManufacturer, buf, 256);
        if (res < 0) {
            printf("failed to get string descriptor\n");
            return;
        }

        printf("Manufacturer: %s\n", buf);
    }
}

int main() {
    libusb_device **devs;
    libusb_context *ctx;

    int res;
    res = libusb_init(&ctx);
    if (res < 0) {
        printf("init error\n");
        exit(-1);
    }

    libusb_set_debug(ctx, 3);

    ssize_t cnt;
    cnt = libusb_get_device_list(ctx, &devs);
    if (cnt < 0) {
        printf("get device error\n");
        exit(-1);
    }

    printf("%Zd device(s) in list\n", cnt);

    int i;
    for (i = 0; i < cnt; ++i) {
        printf("\n");
        printdev(devs[i]);
    }

    libusb_free_device_list(devs, 1);
    libusb_exit(ctx);

    return 0;
}