src/windows_port.cc

/* Copyright (c) 2009, Google Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ---
 * Author: Craig Silverstein
 */

#ifndef _WIN32
#  error You should only be including windows/port.cc in a windows environment!
#endif

#include <string.h>    // for strlen(), memset(), memcmp()
#include <assert.h>
#include <stdarg.h>    // for va_list, va_start, va_end
#include <windows.h>

#include "windows_port.h"

// These call the windows _vsnprintf, but always NUL-terminate.
#if !defined(__MINGW32__) && !defined(__MINGW64__)  /* mingw already defines */
#if !(defined(_MSC_VER) && _MSC_VER >= 1900)  /* msvc 2015 already defines */

#ifdef _MSC_VER
#  pragma warning(push)
#  pragma warning(disable: 4996) // ignore _vsnprintf security warning
#endif
int safe_vsnprintf(char *str, size_t size, const char *format, va_list ap) {
  if (size == 0)        // not even room for a \0?
    return -1;          // not what C99 says to do, but what windows does
  str[size-1] = '\0'; 
  return _vsnprintf(str, size-1, format, ap);
}
#ifdef _MSC_VER
#  pragma warning(pop)
#endif

int snprintf(char *str, size_t size, const char *format, ...) {
  int r;
  va_list ap;
  va_start(ap, format);
  r = vsnprintf(str, size, format, ap);
  va_end(ap);
  return r;
}

#endif  /* if !(defined(_MSC_VER) && _MSC_VER >= 1900)  */
#endif  /* #if !defined(__MINGW32__) && !defined(__MINGW64__) */