Ticket #43: getdevserial.c

#include <stdio.h>
#include <stdlib.h>
#include <libusb-1.0/libusb.h>

libusb_device **list = NULL;
libusb_device_handle *handle = NULL;
ssize_t count;

void onexit(void) {
        if (handle) {
                libusb_close(handle);
                handle = NULL;
        }
        if (list) {
                libusb_free_device_list(list, 1);
                list = NULL;
        }
        libusb_exit(NULL);
}

int main(int argc, char *argv[]) {
        int err, len = 0;
        libusb_device **list = NULL;
        struct libusb_device_descriptor dev;
        ssize_t i;
        unsigned char buffer[256];
        if (argc < 3) {
                printf("Usage: %s VENDOR_ID PRODUCT_ID\n", argv[0]);
                return -1;
        }
        if ((err = libusb_init(NULL)) != 0) {
                printf("Init error\n");
                return err;
        }
        atexit(onexit);
        if ((count = libusb_get_device_list(NULL, &list)) < 0) {
                printf("No dev list\n");
                return err;
        }
        for(i = 0; i < count; i++) {
                libusb_get_device_descriptor(list[i], &dev);
                if ((strtol(argv[1], NULL, 0) == dev.idVendor) && (strtol(argv[2], NULL, 0) == dev.idProduct)) {
                        if ((err = libusb_open(list[i], &handle)) < 0) {
                                printf("Dev open error\n");
                                return err;
                        }
                        if ((err = libusb_set_configuration(handle, 1)) < 0) {
                                printf("Set config error\n");
//                              return err;
                        }
                        len = libusb_get_string_descriptor_ascii(handle, 0, buffer, 255);
                        buffer[255] = '\0';
                        printf("ASCII Length: %3i; Text: %s\n", len, buffer);
                        len = libusb_get_descriptor(handle, LIBUSB_DT_STRING, 0, buffer, 255);
                        buffer[255] = '\0';
                        printf("RAW   Length: %3i; Text: %s\n", len, buffer);
                        return 0;
                }
        }
        printf("Device not found\n");
        return -1;
}