lib/cpp/src/thrift/TOutput.cpp

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 <thrift/Thrift.h>
#include <thrift/TToString.h>
#include <cstring>
#include <cstdlib>
#include <stdarg.h>
#include <stdio.h>

namespace apache {
namespace thrift {

THRIFT_EXPORT TOutput GlobalOutput;

TOutput::TOutput() : f_(&errorTimeWrapper) {}

void TOutput::printf(const char* message, ...) {
#ifndef THRIFT_SQUELCH_CONSOLE_OUTPUT
  // Try to reduce heap usage, even if printf is called rarely.
  static const int STACK_BUF_SIZE = 256;
  char stack_buf[STACK_BUF_SIZE];
  va_list ap;

#ifdef _MSC_VER
  va_start(ap, message);
  int need = _vscprintf(message, ap);
  va_end(ap);

  if (need < STACK_BUF_SIZE) {
    va_start(ap, message);
    vsnprintf_s(stack_buf, STACK_BUF_SIZE, _TRUNCATE, message, ap);
    va_end(ap);
    f_(stack_buf);
    return;
  }
#else
  va_start(ap, message);
  int need = vsnprintf(stack_buf, STACK_BUF_SIZE, message, ap);
  va_end(ap);

  if (need < STACK_BUF_SIZE) {
    f_(stack_buf);
    return;
  }
#endif

  char* heap_buf = (char*)malloc((need + 1) * sizeof(char));
  if (heap_buf == nullptr) {
#ifdef _MSC_VER
    va_start(ap, message);
    vsnprintf_s(stack_buf, STACK_BUF_SIZE, _TRUNCATE, message, ap);
    va_end(ap);
#endif
    // Malloc failed.  We might as well print the stack buffer.
    f_(stack_buf);
    return;
  }

  va_start(ap, message);
  int rval = vsnprintf(heap_buf, need + 1, message, ap);
  va_end(ap);
  // TODO(shigin): inform user
  if (rval != -1) {
    f_(heap_buf);
  }
  free(heap_buf);
#endif
}

void TOutput::errorTimeWrapper(const char* msg) {
#ifndef THRIFT_SQUELCH_CONSOLE_OUTPUT
  time_t now;
  char dbgtime[26];
  time(&now);
  THRIFT_CTIME_R(&now, dbgtime);
  dbgtime[24] = 0;
  fprintf(stderr, "Thrift: %s %s\n", dbgtime, msg);
#endif
}

void TOutput::perror(const char* message, int errno_copy) {
  std::string out = message + std::string(": ") + strerror_s(errno_copy);
  f_(out.c_str());
}

std::string TOutput::strerror_s(int errno_copy) {
#ifndef HAVE_STRERROR_R
  return "errno = " + to_string(errno_copy);
#else // HAVE_STRERROR_R

  char b_errbuf[1024] = {'\0'};
#ifdef STRERROR_R_CHAR_P
  char* b_error = strerror_r(errno_copy, b_errbuf, sizeof(b_errbuf));
#else
  char* b_error = b_errbuf;
  int rv = strerror_r(errno_copy, b_errbuf, sizeof(b_errbuf));
  if (rv == -1) {
    // strerror_r failed.  omgwtfbbq.
    return "XSI-compliant strerror_r() failed with errno = "
           + to_string(errno_copy);
  }
#endif
  // Can anyone prove that explicit cast is probably not necessary
  // to ensure that the string object is constructed before
  // b_error becomes invalid?
  return std::string(b_error);

#endif // HAVE_STRERROR_R
}
}
} // apache::thrift