system_traits.hpp

新版本TR1的stl

/* /////////////////////////////////////////////////////////////////////////
 * File:        unixstl/system/system_traits.hpp
 *
 * Purpose:     Contains the system_traits template class, and ANSI and
 *              Unicode specialisations thereof.
 *
 * Created:     15th November 2002
 * Updated:     12th March 2007
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 2002-2007, Matthew Wilson and Synesis Software
 * 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(s) of Matthew Wilson and Synesis Software nor the names of
 *   any 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.
 *
 * ////////////////////////////////////////////////////////////////////// */


/** \file unixstl/system/system_traits.hpp
 *
 * \brief [C++ only] Definition of the unixstl::system_traits traits
 *  class
 *   (\ref group__library__system "System" Library).
 */

#ifndef UNIXSTL_INCL_UNIXSTL_SYSTEM_HPP_SYSTEM_TRAITS
#define UNIXSTL_INCL_UNIXSTL_SYSTEM_HPP_SYSTEM_TRAITS

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define UNIXSTL_VER_UNIXSTL_SYSTEM_HPP_SYSTEM_TRAITS_MAJOR     5
# define UNIXSTL_VER_UNIXSTL_SYSTEM_HPP_SYSTEM_TRAITS_MINOR     0
# define UNIXSTL_VER_UNIXSTL_SYSTEM_HPP_SYSTEM_TRAITS_REVISION  2
# define UNIXSTL_VER_UNIXSTL_SYSTEM_HPP_SYSTEM_TRAITS_EDIT      96
#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

/* /////////////////////////////////////////////////////////////////////////
 * Includes
 */

#ifndef UNIXSTL_INCL_UNIXSTL_H_UNIXSTL
# include <unixstl/unixstl.h>
#endif /* !UNIXSTL_INCL_UNIXSTL_H_UNIXSTL */
#ifdef _WIN32
# include <ctype.h>
#endif /* _WIN32 */
#include <errno.h>
#include <fcntl.h>
#ifdef _WIN32
# include <io.h>
# if defined(STLSOFT_COMPILER_IS_INTEL) || \
     defined(STLSOFT_COMPILER_IS_MSVC)
#  include <direct.h>
# endif /* os && compiler */
#endif /* _WIN32 */
#include <dlfcn.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <sys/types.h>
#include <sys/stat.h>

/* /////////////////////////////////////////////////////////////////////////
 * Namespace
 */

#ifndef _UNIXSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
/* There is no stlsoft namespace, so must define ::unixstl */
namespace unixstl
{
# else
/* Define stlsoft::unixstl_project */

namespace stlsoft
{

namespace unixstl_project
{

# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_UNIXSTL_NO_NAMESPACE */

/* /////////////////////////////////////////////////////////////////////////
 * Classes
 */

#ifdef STLSOFT_DOCUMENTATION_SKIP_SECTION
/** \brief Traits for accessing the correct system functions for a given
 *   character type.
 *
 * \ingroup group__library__system
 *
 * system_traits is a traits class for determining the correct system
 * structures and functions for a given character type.
 *
 * \param C The character type (e.g. \c char, \c wchar_t)
 */
template <ss_typename_param_k C>
struct system_traits
{
/// \name Types
/// @{
public:
    /// \brief The character type
    typedef C                                       char_type;
    /// \brief The size type
    typedef us_size_t                               size_type;
    /// \brief The difference type
    typedef us_ptrdiff_t                            difference_type;
    /// \brief The current instantion of the type
    typedef system_traits<C>                        class_type;
    /// \brief The (signed) integer type
    typedef us_int_t                                int_type;
    /// \brief The Boolean type
    typedef us_bool_t                               bool_type;
    /// \brief The type of a handle to a dynamically loaded module
    typedef void                                    *module_type;
    /// \brief The type of a handle to a kernel object
    typedef int                                     handle_type;
    /// \brief The type of system error codes
    typedef int                                     error_type;
/// @}

/// \name General string handling
/// @{
public:
    /// \brief Copies the contents of \c src to \c dest
    static char_type    *str_copy(char_type *dest, char_type const* src);
    /// \brief Copies the contents of \c src to \c dest, up to cch \c characters
    static char_type    *str_n_copy(char_type *dest, char_type const* src, size_type cch);
    /// \brief Appends the contents of \c src to \c dest
    static char_type    *str_cat(char_type *dest, char_type const* src);
    /// \brief Appends the contents of \c src to \c dest, up to cch \c characters
    static char_type    *str_n_cat(char_type *dest, char_type const* src, size_type cch);
    /// \brief Comparies the contents of \c src and \c dest
    static int_type     str_compare(char_type const* s1, char_type const* s2);
    /// \brief Comparies the contents of \c src and \c dest in a case-insensitive fashion
    static int_type     str_compare_no_case(char_type const* s1, char_type const* s2);
    /// \brief Comparies the contents of \c src and \c dest up to \c cch characters
    static int_type     str_n_compare(char_type const* s1, char_type const* s2, size_type cch);
    /// \brief Evaluates the length of \c src
    static size_type    str_len(char_type const* src);
    /// \brief Finds the given character \c ch in \c s
    static char_type    *str_chr(char_type const* s, char_type ch);
    /// \brief Finds the rightmost instance \c ch in \c s
    static char_type    *str_rchr(char_type const* s, char_type ch);
    /// \brief Finds the given substring \c sub in \c s
    static char_type    *str_str(char_type const* s, char_type const* sub);
    /// \brief Finds one of a set of characters in \c s
    static char_type    *str_pbrk(char_type const* s, char_type const* charSet);
    /// \brief Returns a pointer to the end of the string
    static char_type    *str_end(char_type const* s);
/// @}

/// \name Dynamic Loading
/// @{
public:
    /// \brief Loads the given executable module
    static module_type  load_library(char_type const* name);
    /// \brief Closes the given executable module
    static bool_type    free_library(module_type hModule);
    /// \brief Retrieves the given symbol from the library
    static void         *find_symbol(module_type hModule, char const* symbolName);
/// @}

/// \name Kernel object control
/// @{
public:
    /// \brief Closes the given operating system handle
    static bool_type    close_handle(handle_type h);
/// @}

/// \name Error
/// @{
public:
    /// \brief Gives the last error
    static error_type   get_last_error();
    /// \brief Sets the last error
    static void         set_last_error(error_type er = error_type());
/// @}

/// \name Environment
/// @{
public:
    /// \brief Gets an environment variable into the given buffer
    ///
    /// \param name The name of the variable to find
    /// \param buffer The buffer in which to write the variable. If this is NULL, then the required length is returned
    /// \param cchBuffer The size of the buffer, in characters
    static size_type    get_environment_variable(char_type const* name, char_type* buffer, size_type cchBuffer);
    /// \brief Expands environment strings in \c src into \c buffer, up to a maximum \c cchDest characters
    static size_type    expand_environment_strings(char_type const* src, char_type* buffer, size_type cchBuffer);
/// @}
};

#else /* ? STLSOFT_DOCUMENTATION_SKIP_SECTION */

template <ss_typename_param_k C>
struct system_traits;

STLSOFT_TEMPLATE_SPECIALISATION
struct system_traits<us_char_a_t>
{
public:
    typedef us_char_a_t                 char_type;
    typedef us_size_t                   size_type;
    typedef us_ptrdiff_t                difference_type;
    typedef system_traits<us_char_a_t>  class_type;
    typedef us_int_t                    int_type;
    typedef us_bool_t                   bool_type;
    typedef void                        *module_type;
    typedef int                         handle_type;
    typedef int                         error_type;

public:
    static char_type *str_copy(char_type *dest, char_type const* src)
    {
        return ::strcpy(dest, src);
    }

    static char_type *str_n_copy(char_type *dest, char_type const* src, size_type cch)
    {
        return ::strncpy(dest, src, cch);
    }

    static char_type *str_cat(char_type *dest, char_type const* src)
    {