/**************************************************************************
 *
 * Copyright 2008-2010 Vmware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/


#include "os_misc.h"

#include <stdarg.h>


#if defined(PIPE_SUBSYSTEM_WINDOWS_USER)

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN      // Exclude rarely-used stuff from Windows headers
#endif
#include <windows.h>
#include <stdio.h>

#else

#include <stdio.h>
#include <stdlib.h>

#endif


#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_CYGWIN)
#  include <unistd.h>
#elif defined(PIPE_OS_APPLE) || defined(PIPE_OS_BSD)
#  include <sys/sysctl.h>
#elif defined(PIPE_OS_HAIKU)
#  include <kernel/OS.h>
#elif defined(PIPE_OS_WINDOWS)
#  include <windows.h>
#else
#error unexpected platform in os_sysinfo.c
#endif


void
os_log_message(const char *message)
{
   /* If the GALLIUM_LOG_FILE environment variable is set to a valid filename,
    * write all messages to that file.
    */
   static FILE *fout = NULL;

   if (!fout) {
      /* one-time init */
      const char *filename = os_get_option("GALLIUM_LOG_FILE");
      if (filename)
         fout = fopen(filename, "w");
      if (!fout)
         fout = stderr;
   }

#if defined(PIPE_SUBSYSTEM_WINDOWS_USER)
   OutputDebugStringA(message);
   if(GetConsoleWindow() && !IsDebuggerPresent()) {
      fflush(stdout);
      fputs(message, fout);
      fflush(fout);
   }
   else if (fout != stderr) {
      fputs(message, fout);
      fflush(fout);
   }
#else /* !PIPE_SUBSYSTEM_WINDOWS */
   fflush(stdout);
   fputs(message, fout);
   fflush(fout);
#endif
}


const char *
os_get_option(const char *name)
{
   return getenv(name);
}


/**
 * Return the size of the total physical memory.
 * \param size returns the size of the total physical memory
 * \return true for success, or false on failure
 */
bool
os_get_total_physical_memory(uint64_t *size)
{
#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_CYGWIN)
   const long phys_pages = sysconf(_SC_PHYS_PAGES);
   const long page_size = sysconf(_SC_PAGE_SIZE);

   *size = phys_pages * page_size;
   return (phys_pages > 0 && page_size > 0);
#elif defined(PIPE_OS_APPLE) || defined(PIPE_OS_BSD)
   size_t len = sizeof(size);
   int mib[2];

   mib[0] = CTL_HW;
#if defined(PIPE_OS_APPLE)
   mib[1] = HW_MEMSIZE;
#elif defined(PIPE_OS_NETBSD) || defined(PIPE_OS_OPENBSD)
   mib[1] = HW_PHYSMEM64;
#elif defined(PIPE_OS_FREEBSD)
   mib[1] = HW_REALMEM;
#else
#error Unsupported *BSD
#endif

   return (sysctl(mib, 2, &size, &len, NULL, 0) == 0);
#elif defined(PIPE_OS_HAIKU)
   system_info info;
   status_t ret;

   ret = get_system_info(&info);
   *size = info.max_pages * B_PAGE_SIZE;
   return (ret == B_OK);
#elif defined(PIPE_OS_WINDOWS)
   MEMORYSTATUSEX status;
   BOOL ret;

   status.dwLength = sizeof(status);
   ret = GlobalMemoryStatusEx(&status);
   *size = status.ullTotalPhys;
   return (ret == TRUE);
#else
#error unexpected platform in os_sysinfo.c
   return false;
#endif
}