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/*-*- linux-c -*-*/
/*
* Copyright (C) 2009 Lennart Poettering <lennart@poettering.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details:
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <ctype.h>
#include <stdlib.h>
#include <libudev.h>
static int get_vid_pid(
struct udev_device *usb,
uint16_t *vid,
uint16_t *pid) {
const char *t;
if ((t = udev_device_get_sysattr_value(usb, "idVendor"))) {
unsigned u;
if (sscanf(t, "%04x", &u) != 1 || u <= 0 || u > 0xFFFFU) {
fprintf(stderr, "Failed to parse idVendor on %s.\n", udev_device_get_syspath(usb));
return -1;
}
*vid = (uint16_t) u;
}
if ((t = udev_device_get_sysattr_value(usb, "idProduct"))) {
unsigned u;
if (sscanf(t, "%04x", &u) != 1 || u > 0xFFFFU) {
fprintf(stderr, "Failed to parse idProduct on %s.\n", udev_device_get_syspath(usb));
return -1;
}
*pid = (uint16_t) u;
}
return 0;
}
static void rstrip(char *n) {
size_t i;
for (i = strlen(n); i > 0 && isspace(n[i-1]); i--)
n[i-1] = 0;
}
#define HEXCHARS "0123456789abcdefABCDEF"
#define WHITESPACE " \t\n\r"
static int lookup_vid_pid(
uint16_t vid,
uint16_t pid,
char **vendor,
char **product) {
FILE *f;
int ret = -1;
int found_vendor = 0;
char *line = NULL;
*vendor = *product = NULL;
if (!(f = fopen(USB_DATABASE, "r"))) {
fprintf(stderr, "Failed to open database file "USB_DATABASE": %s", strerror(errno));
return -1;
}
for (;;) {
size_t n;
if (line) {
free(line);
line = NULL;
}
if (getline(&line, &n, f) < 0)
break;
rstrip(line);
if (line[0] == '#' || line[0] == 0)
continue;
if (strspn(line, HEXCHARS) == 4) {
unsigned u;
if (found_vendor)
break;
if (sscanf(line, "%04x", &u) == 1 && u == vid) {
char *t;
t = line+4;
t += strspn(t, WHITESPACE);
if (!(*vendor = strdup(t))) {
fprintf(stderr, "Out of memory.\n");
goto finish;
}
found_vendor = 1;
}
continue;
}
if (found_vendor && line[0] == '\t' && strspn(line+1, HEXCHARS) == 4) {
unsigned u;
if (sscanf(line+1, "%04x", &u) == 1 && u == pid) {
char *t;
t = line+5;
t += strspn(t, WHITESPACE);
if (!(*product = strdup(t))) {
fprintf(stderr, "Out of memory.\n");
goto finish;
}
break;
}
}
}
ret = 0;
finish:
free(line);
fclose(f);
if (ret < 0) {
free(*product);
free(*vendor);
*product = *vendor = NULL;
}
return ret;
}
int main(int argc, char*argv[]) {
struct udev *udev = NULL;
int ret = 1;
char *sp;
struct udev_device *dev = NULL, *usb = NULL;
uint16_t vid = 0, pid = 0;
char *vendor = NULL, *product = NULL;
if (argc < 2) {
fprintf(stderr, "Need to pass sysfs path.\n");
goto finish;
}
if (!(udev = udev_new()))
goto finish;
if (asprintf(&sp, "%s/%s", udev_get_sys_path(udev), argv[1]) < 0) {
fprintf(stderr, "Failed to allocate sysfs path.\n");
goto finish;
}
dev = udev_device_new_from_syspath(udev, sp);
free(sp);
if (!dev) {
fprintf(stderr, "Failed to access %s.\n", argv[1]);
goto finish;
}
if (!(usb = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_device"))) {
fprintf(stderr, "Failed to find usb_device.\n");
goto finish;
}
if (get_vid_pid(usb, &vid, &pid) < 0)
goto finish;
if (lookup_vid_pid(vid, pid, &vendor, &product) < 0)
goto finish;
if (vendor)
printf("ID_VENDOR_FROM_DATABASE=%s\n", vendor);
if (product)
printf("ID_MODEL_FROM_DATABASE=%s\n", product);
ret = 0;
finish:
if (dev)
udev_device_unref(dev);
if (udev)
udev_unref(udev);
free(vendor);
free(product);
return ret;
}
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