267 lines
9.1 KiB
C++
267 lines
9.1 KiB
C++
// Copyright (c) 2014 The Chromium Embedded Framework Authors.
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// Portions copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "include/base/cef_logging.h"
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#if defined(OS_WIN)
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#include <windows.h>
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#include <algorithm>
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#include <sstream>
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#elif defined(OS_POSIX)
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#endif
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#include "include/internal/cef_string_types.h"
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namespace cef {
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namespace logging {
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namespace {
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#if defined(OS_POSIX)
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// From base/posix/safe_strerror.cc
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#if defined(__GLIBC__) || defined(OS_NACL)
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#define USE_HISTORICAL_STRERRO_R 1
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#else
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#define USE_HISTORICAL_STRERRO_R 0
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#endif
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#if USE_HISTORICAL_STRERRO_R && defined(__GNUC__)
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// GCC will complain about the unused second wrap function unless we tell it
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// that we meant for them to be potentially unused, which is exactly what this
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// attribute is for.
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#define POSSIBLY_UNUSED __attribute__((unused))
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#else
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#define POSSIBLY_UNUSED
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#endif
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#if USE_HISTORICAL_STRERRO_R
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// glibc has two strerror_r functions: a historical GNU-specific one that
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// returns type char *, and a POSIX.1-2001 compliant one available since 2.3.4
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// that returns int. This wraps the GNU-specific one.
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static void POSSIBLY_UNUSED
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wrap_posix_strerror_r(char* (*strerror_r_ptr)(int, char*, size_t),
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int err,
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char* buf,
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size_t len) {
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// GNU version.
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char* rc = (*strerror_r_ptr)(err, buf, len);
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if (rc != buf) {
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// glibc did not use buf and returned a static string instead. Copy it
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// into buf.
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buf[0] = '\0';
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strncat(buf, rc, len - 1);
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}
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// The GNU version never fails. Unknown errors get an "unknown error" message.
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// The result is always null terminated.
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}
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#endif // USE_HISTORICAL_STRERRO_R
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// Wrapper for strerror_r functions that implement the POSIX interface. POSIX
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// does not define the behaviour for some of the edge cases, so we wrap it to
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// guarantee that they are handled. This is compiled on all POSIX platforms, but
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// it will only be used on Linux if the POSIX strerror_r implementation is
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// being used (see below).
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static void POSSIBLY_UNUSED wrap_posix_strerror_r(int (*strerror_r_ptr)(int,
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char*,
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size_t),
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int err,
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char* buf,
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size_t len) {
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int old_errno = errno;
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// Have to cast since otherwise we get an error if this is the GNU version
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// (but in such a scenario this function is never called). Sadly we can't use
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// C++-style casts because the appropriate one is reinterpret_cast but it's
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// considered illegal to reinterpret_cast a type to itself, so we get an
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// error in the opposite case.
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int result = (*strerror_r_ptr)(err, buf, len);
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if (result == 0) {
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// POSIX is vague about whether the string will be terminated, although
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// it indirectly implies that typically ERANGE will be returned, instead
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// of truncating the string. We play it safe by always terminating the
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// string explicitly.
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buf[len - 1] = '\0';
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} else {
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// Error. POSIX is vague about whether the return value is itself a system
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// error code or something else. On Linux currently it is -1 and errno is
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// set. On BSD-derived systems it is a system error and errno is unchanged.
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// We try and detect which case it is so as to put as much useful info as
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// we can into our message.
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int strerror_error; // The error encountered in strerror
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int new_errno = errno;
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if (new_errno != old_errno) {
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// errno was changed, so probably the return value is just -1 or something
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// else that doesn't provide any info, and errno is the error.
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strerror_error = new_errno;
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} else {
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// Either the error from strerror_r was the same as the previous value, or
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// errno wasn't used. Assume the latter.
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strerror_error = result;
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}
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// snprintf truncates and always null-terminates.
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snprintf(buf, len, "Error %d while retrieving error %d", strerror_error,
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err);
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}
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errno = old_errno;
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}
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void safe_strerror_r(int err, char* buf, size_t len) {
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if (buf == NULL || len <= 0) {
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return;
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}
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// If using glibc (i.e., Linux), the compiler will automatically select the
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// appropriate overloaded function based on the function type of strerror_r.
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// The other one will be elided from the translation unit since both are
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// static.
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wrap_posix_strerror_r(&strerror_r, err, buf, len);
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}
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std::string safe_strerror(int err) {
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const int buffer_size = 256;
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char buf[buffer_size];
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safe_strerror_r(err, buf, sizeof(buf));
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return std::string(buf);
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}
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#endif // defined(OS_POSIX)
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} // namespace
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// MSVC doesn't like complex extern templates and DLLs.
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#if !defined(COMPILER_MSVC)
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// Explicit instantiations for commonly used comparisons.
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template std::string* MakeCheckOpString<int, int>(const int&,
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const int&,
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const char* names);
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template std::string* MakeCheckOpString<unsigned long, unsigned long>(
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const unsigned long&,
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const unsigned long&,
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const char* names);
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template std::string* MakeCheckOpString<unsigned long, unsigned int>(
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const unsigned long&,
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const unsigned int&,
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const char* names);
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template std::string* MakeCheckOpString<unsigned int, unsigned long>(
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const unsigned int&,
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const unsigned long&,
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const char* names);
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template std::string* MakeCheckOpString<std::string, std::string>(
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const std::string&,
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const std::string&,
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const char* name);
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#endif
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#if defined(OS_WIN)
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LogMessage::SaveLastError::SaveLastError() : last_error_(::GetLastError()) {}
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LogMessage::SaveLastError::~SaveLastError() {
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::SetLastError(last_error_);
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}
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#endif // defined(OS_WIN)
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LogMessage::LogMessage(const char* file, int line, LogSeverity severity)
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: severity_(severity), file_(file), line_(line) {}
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LogMessage::LogMessage(const char* file, int line, std::string* result)
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: severity_(LOG_FATAL), file_(file), line_(line) {
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stream_ << "Check failed: " << *result;
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delete result;
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}
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LogMessage::LogMessage(const char* file,
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int line,
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LogSeverity severity,
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std::string* result)
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: severity_(severity), file_(file), line_(line) {
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stream_ << "Check failed: " << *result;
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delete result;
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}
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LogMessage::~LogMessage() {
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stream_ << std::endl;
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std::string str_newline(stream_.str());
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cef_log(file_, line_, severity_, str_newline.c_str());
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}
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#if defined(OS_WIN)
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// This has already been defined in the header, but defining it again as DWORD
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// ensures that the type used in the header is equivalent to DWORD. If not,
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// the redefinition is a compile error.
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typedef DWORD SystemErrorCode;
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#endif
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SystemErrorCode GetLastSystemErrorCode() {
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#if defined(OS_WIN)
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return ::GetLastError();
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#elif defined(OS_POSIX)
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return errno;
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#else
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#error Not implemented
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#endif
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}
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#if defined(OS_WIN)
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std::string SystemErrorCodeToString(SystemErrorCode error_code) {
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const int error_message_buffer_size = 256;
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char msgbuf[error_message_buffer_size];
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DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
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DWORD len = FormatMessageA(flags, NULL, error_code, 0, msgbuf,
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arraysize(msgbuf), NULL);
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std::stringstream ss;
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if (len) {
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std::string s(msgbuf);
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// Messages returned by system end with line breaks.
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s.erase(std::remove_if(s.begin(), s.end(), ::isspace), s.end());
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ss << s << " (0x" << std::hex << error_code << ")";
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} else {
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ss << "Error (0x" << std::hex << GetLastError()
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<< ") while retrieving error. (0x" << error_code << ")";
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}
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return ss.str();
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}
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#elif defined(OS_POSIX)
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std::string SystemErrorCodeToString(SystemErrorCode error_code) {
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return safe_strerror(error_code);
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}
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#else
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#error Not implemented
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#endif
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#if defined(OS_WIN)
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Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file,
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int line,
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LogSeverity severity,
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SystemErrorCode err)
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: err_(err), log_message_(file, line, severity) {}
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Win32ErrorLogMessage::~Win32ErrorLogMessage() {
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stream() << ": " << SystemErrorCodeToString(err_);
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}
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#elif defined(OS_POSIX)
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ErrnoLogMessage::ErrnoLogMessage(const char* file,
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int line,
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LogSeverity severity,
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SystemErrorCode err)
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: err_(err), log_message_(file, line, severity) {}
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ErrnoLogMessage::~ErrnoLogMessage() {
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stream() << ": " << SystemErrorCodeToString(err_);
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}
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#endif // OS_WIN
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std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) {
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cef_string_utf8_t str = {0};
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std::wstring tmp_str(wstr);
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cef_string_wide_to_utf8(wstr, tmp_str.size(), &str);
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out << str.str;
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cef_string_utf8_clear(&str);
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return out;
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}
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} // namespace logging
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} // namespace cef
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