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Patrick Venture863b9242018-03-08 08:29:23 -08001/**
2 * Copyright 2017 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
Patrick Ventureda4a5dd2018-08-31 09:42:48 -070017#include "sysfs/util.hpp"
18
Patrick Venture863b9242018-03-08 08:29:23 -080019#include <experimental/filesystem>
20#include <iostream>
21#include <string>
22
Patrick Venture863b9242018-03-08 08:29:23 -080023/*
24 * There are two basic paths I want to support:
25 * 1. /sys/class/hwmon/hwmon0/pwm1
Patrick Ventureda4a5dd2018-08-31 09:42:48 -070026 * 2. /sys/devices/platform/ahb/1e786000.pwm-tacho-controller/hwmon/<asterisk
27 * asterisk>/pwm1
Patrick Venture863b9242018-03-08 08:29:23 -080028 *
29 * In this latter case, I want to fill in that gap. Assuming because it's this
30 * path that it'll only have one directory there.
31 */
32
33static constexpr auto platform = "/sys/devices/platform/";
34namespace fs = std::experimental::filesystem;
35
Patrick Venture863b9242018-03-08 08:29:23 -080036std::string FixupPath(std::string original)
37{
38 std::string::size_type n, x;
39
40 /* TODO: Consider the merits of using regex for this. */
41 n = original.find("**");
42 x = original.find(platform);
43
44 if ((n != std::string::npos) && (x != std::string::npos))
45 {
46 /* This path has some missing pieces and we support it. */
47 std::string base = original.substr(0, n);
48 std::string fldr;
49 std::string f = original.substr(n + 2, original.size() - (n + 2));
50
51 /* Equivalent to glob and grab 0th entry. */
52 for (const auto& folder : fs::directory_iterator(base))
53 {
54 fldr = folder.path();
55 break;
56 }
57
58 if (!fldr.length())
59 {
60 return original;
61 }
62
63 return fldr + f;
64 }
65 else
66 {
67 /* It'll throw an exception when we use it if it's still bad. */
68 return original;
69 }
70}