/**
 * \file   os_isfile.c
 * \brief  Returns true if the given file exists on the file system.
 * \author Copyright (c) 2002-2008 Jason Perkins and the Premake project
 */

#include <sys/stat.h>
#include "premake.h"


int os_isfile(lua_State* L)
{
	const char* filename = luaL_checkstring(L, 1);
	lua_pushboolean(L, do_isfile(L, filename));
	return 1;
}


int do_isfile(lua_State* L, const char* filename)
{
#if PLATFORM_WINDOWS
	wchar_t wide_path[PATH_MAX];
	DWORD attrib;

	if (MultiByteToWideChar(CP_UTF8, 0, filename, -1, wide_path, PATH_MAX) == 0)
	{
		lua_pushstring(L, "unable to encode filepath");
		return lua_error(L);
	}

	attrib = GetFileAttributesW(wide_path);
	if (attrib != INVALID_FILE_ATTRIBUTES)
	{
		return (attrib & FILE_ATTRIBUTE_DIRECTORY) == 0;
	}
#else
	struct stat buf;

	(void)(L);  /* warning: unused parameter */

	if (stat(filename, &buf) == 0)
	{
		return ((buf.st_mode & S_IFDIR) == 0);
	}
#endif

	return 0;
}