adb: move adb_strerror to sysdeps/win32/errno.cpp.

LIBADB_windows_SRC_FILES := \

    sysdeps_win32.cpp \

    sysdeps/win32/errno.cpp \

    sysdeps/win32/stat.cpp \

    usb_windows.cpp \

LIBADB_TEST_windows_SRCS := \

    sysdeps/win32/errno_test.cpp \

    sysdeps_win32_test.cpp \

include $(CLEAR_VARS)

 */

#include <dirent.h>

#include <errno.h>

#include <inttypes.h>

#include <limits.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/stat.h>

#include <sys/time.h>

#include <sys/types.h>

#include <android-base/unique_fd.h>

#include <android-base/utf8.h>

#include "sysdeps/errno.h"

#include "sysdeps/stat.h"

/*

#define getcwd adb_getcwd

char* adb_strerror(int err);

#define strerror adb_strerror

// Helper class to convert UTF-16 argv from wmain() to UTF-8 args that can be

// passed to main().

class NarrowArgs {

#pragma once

#include <errno.h>

#include <string.h>

// Translate an errno value from linux to the host equivalent.

int translate_linux_errno(int error);

#if defined(_WIN32)

char* adb_strerror(int err);

#define strerror adb_strerror

#endif

/*

 * Copyright (C) 2016 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include "sysdeps/errno.h"

#include <windows.h>

#include <string>

// Overrides strerror() to handle error codes not supported by the Windows C

// Runtime (MSVCRT.DLL).

char* adb_strerror(int err) {

// sysdeps.h defines strerror to adb_strerror, but in this function, we

// want to call the real C Runtime strerror().

#pragma push_macro("strerror")

#undef strerror

    const int saved_err = errno;  // Save because we overwrite it later.

    // Lookup the string for an unknown error.

    char* errmsg = strerror(-1);

    const std::string unknown_error = (errmsg == nullptr) ? "" : errmsg;

    // Lookup the string for this error to see if the C Runtime has it.

    errmsg = strerror(err);

    if (errmsg != nullptr && unknown_error != errmsg) {

        // The CRT returned an error message and it is different than the error

        // message for an unknown error, so it is probably valid, so use it.

    } else {

        // Check if we have a string for this error code.

        const char* custom_msg = nullptr;

        switch (err) {

#pragma push_macro("ERR")

#undef ERR

#define ERR(errnum, desc) case errnum: custom_msg = desc; break

            // These error strings are from AOSP bionic/libc/include/sys/_errdefs.h.

            // Note that these cannot be longer than 94 characters because we

            // pass this to _strerror() which has that requirement.

            ERR(ECONNRESET,    "Connection reset by peer");

            ERR(EHOSTUNREACH,  "No route to host");

            ERR(ENETDOWN,      "Network is down");

            ERR(ENETRESET,     "Network dropped connection because of reset");

            ERR(ENOBUFS,       "No buffer space available");

            ERR(ENOPROTOOPT,   "Protocol not available");

            ERR(ENOTCONN,      "Transport endpoint is not connected");

            ERR(ENOTSOCK,      "Socket operation on non-socket");

            ERR(EOPNOTSUPP,    "Operation not supported on transport endpoint");

#pragma pop_macro("ERR")

        }

        if (custom_msg != nullptr) {

            // Use _strerror() to write our string into the writable per-thread

            // buffer used by strerror()/_strerror(). _strerror() appends the

            // msg for the current value of errno, so set errno to a consistent

            // value for every call so that our code-path is always the same.

            errno = 0;

            errmsg = _strerror(custom_msg);

            const size_t custom_msg_len = strlen(custom_msg);

            // Just in case _strerror() returned a read-only string, check if

            // the returned string starts with our custom message because that

            // implies that the string is not read-only.

            if ((errmsg != nullptr) && !strncmp(custom_msg, errmsg, custom_msg_len)) {

                // _strerror() puts other text after our custom message, so

                // remove that by terminating after our message.

                errmsg[custom_msg_len] = '\0';

            } else {

                // For some reason nullptr was returned or a pointer to a

                // read-only string was returned, so fallback to whatever

                // strerror() can muster (probably "Unknown error" or some

                // generic CRT error string).

                errmsg = strerror(err);

            }

        } else {

            // We don't have a custom message, so use whatever strerror(err)

            // returned earlier.

        }

    }

    errno = saved_err;  // restore

    return errmsg;

#pragma pop_macro("strerror")

}