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301 lines
10 KiB
301 lines
10 KiB
/* /////////////////////////////////////////////////////////////////////////
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* File: winstl/system/environment_variable.hpp
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*
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* Purpose: Simple class that provides access to an environment variable.
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*
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* Created: 20th December 2002
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* Updated: 11th August 2010
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*
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* Thanks to: Pablo Aguilar for requesting size() and empty().
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*
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* Home: http://stlsoft.org/
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*
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* Copyright (c) 2002-2010, Matthew Wilson and Synesis Software
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name(s) of Matthew Wilson and Synesis Software nor the names of
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* any contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* ////////////////////////////////////////////////////////////////////// */
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/** \file winstl/system/environment_variable.hpp
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*
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* \brief [C++ only] Definition of the winstl::basic_environment_variable
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* class template
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* (\ref group__library__system "System" Library).
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*/
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#ifndef WINSTL_INCL_WINSTL_SYSTEM_HPP_ENVIRONMENT_VARIABLE
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#define WINSTL_INCL_WINSTL_SYSTEM_HPP_ENVIRONMENT_VARIABLE
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#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
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# define WINSTL_VER_WINSTL_SYSTEM_HPP_ENVIRONMENT_VARIABLE_MAJOR 4
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# define WINSTL_VER_WINSTL_SYSTEM_HPP_ENVIRONMENT_VARIABLE_MINOR 3
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# define WINSTL_VER_WINSTL_SYSTEM_HPP_ENVIRONMENT_VARIABLE_REVISION 1
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# define WINSTL_VER_WINSTL_SYSTEM_HPP_ENVIRONMENT_VARIABLE_EDIT 65
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#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */
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/* /////////////////////////////////////////////////////////////////////////
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* Compatibility
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*/
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/*
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[Incompatibilies-start]
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STLSOFT_COMPILER_IS_MSVC: _MSC_VER<1200
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[Incompatibilies-end]
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*/
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/* /////////////////////////////////////////////////////////////////////////
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* Includes
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*/
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#ifndef WINSTL_INCL_WINSTL_H_WINSTL
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# include <winstl/winstl.h>
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#endif /* !WINSTL_INCL_WINSTL_H_WINSTL */
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#ifndef WINSTL_INCL_WINSTL_SYSTEM_HPP_SYSTEM_TRAITS
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# include <winstl/system/system_traits.hpp> // for get_environment_variable()
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#endif /* !WINSTL_INCL_WINSTL_SYSTEM_HPP_SYSTEM_TRAITS */
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#ifndef STLSOFT_INCL_STLSOFT_SHIMS_ACCESS_HPP_STRING
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# include <stlsoft/shims/access/string.hpp>
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#endif /* !STLSOFT_INCL_STLSOFT_SHIMS_ACCESS_HPP_STRING */
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#ifndef WINSTL_INCL_WINSTL_SHIMS_ACCESS_HPP_STRING
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# include <winstl/shims/access/string.hpp>
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#endif /* !WINSTL_INCL_WINSTL_SHIMS_ACCESS_HPP_STRING */
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#ifndef STLSOFT_INCL_STLSOFT_MEMORY_HPP_AUTO_BUFFER
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# include <stlsoft/memory/auto_buffer.hpp>
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#endif /* !STLSOFT_INCL_STLSOFT_MEMORY_HPP_AUTO_BUFFER */
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#ifndef WINSTL_INCL_WINSTL_MEMORY_HPP_PROCESSHEAP_ALLOCATOR
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# include <winstl/memory/processheap_allocator.hpp>
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#endif /* !WINSTL_INCL_WINSTL_MEMORY_HPP_PROCESSHEAP_ALLOCATOR */
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/* /////////////////////////////////////////////////////////////////////////
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* Namespace
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*/
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#ifndef _WINSTL_NO_NAMESPACE
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# if defined(_STLSOFT_NO_NAMESPACE) || \
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defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
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/* There is no stlsoft namespace, so must define ::winstl */
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namespace winstl
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{
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# else
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/* Define stlsoft::winstl_project */
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namespace stlsoft
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{
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namespace winstl_project
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{
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# endif /* _STLSOFT_NO_NAMESPACE */
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#endif /* !_WINSTL_NO_NAMESPACE */
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/* /////////////////////////////////////////////////////////////////////////
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* basic_environment_variable
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*
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* This class converts a relative path to an absolute one, and effectively acts
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* as a C-string of its value.
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*/
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/** Represents an environment variable
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*
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* \ingroup group__library__system
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*
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* \param C The character type
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* \param T The traits type. On translators that support default template arguments, this defaults to system_traits<C>
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*/
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template< ss_typename_param_k C
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#ifdef STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_CLASS_ARGUMENT_SUPPORT
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, ss_typename_param_k T = system_traits<C>
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#else /* ? STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_CLASS_ARGUMENT_SUPPORT */
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, ss_typename_param_k T /* = system_traits<C> */
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#endif /* STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_CLASS_ARGUMENT_SUPPORT */
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>
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class basic_environment_variable
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{
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public:
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/// The char type
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typedef C char_type;
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/// The traits type
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typedef T traits_type;
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/// The allocator type
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typedef processheap_allocator<C> allocator_type;
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/// The current parameterisation of the type
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typedef basic_environment_variable<C, T> class_type;
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/// The size type
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typedef ws_size_t size_type;
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/// The difference type
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typedef ws_ptrdiff_t difference_type;
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/// The Boolean type
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typedef ws_bool_t bool_type;
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// Construction
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public:
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/// Create an instance representing the given environment variable
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ss_explicit_k basic_environment_variable(char_type const* name)
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: m_buffer(1 + traits_type::get_environment_variable(name, 0, 0))
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{
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if( 0 == traits_type::get_environment_variable(name, &m_buffer[0], m_buffer.size()) &&
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0 != m_buffer.size())
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{
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m_buffer[0] = 0;
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}
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else
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{
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// This is necessary because GetEnvironmentVariable() does not do what
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// it's documented to do
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m_buffer.resize(1 + traits_type::str_len(m_buffer.data()));
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}
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}
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#ifdef STLSOFT_CF_MEMBER_TEMPLATE_CTOR_SUPPORT
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/// Create an instance representing the given environment variable
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template<ss_typename_param_k S>
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ss_explicit_k basic_environment_variable(S const& name)
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: m_buffer(1 + traits_type::get_environment_variable(stlsoft_ns_qual(c_str_ptr)(name), 0, 0))
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{
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if( 0 == traits_type::get_environment_variable(stlsoft_ns_qual(c_str_ptr)(name), &m_buffer[0], m_buffer.size()) &&
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0 != m_buffer.size())
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{
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m_buffer[0] = 0;
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}
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else
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{
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// This is necessary because GetEnvironmentVariable() does not do what
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// it's documented to do
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m_buffer.resize(1 + traits_type::str_len(m_buffer.data()));
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}
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}
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#endif /* STLSOFT_CF_MEMBER_TEMPLATE_CTOR_SUPPORT */
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// Conversions
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public:
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/// Implicit conversion to a non-mutable (const) pointer to the variable
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operator char_type const* () const
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{
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return m_buffer.data();
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}
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/// Returns a pointer to a nul-terminated string
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char_type const* c_str() const
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{
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return m_buffer.data();
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}
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// Attributes
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public:
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/// Returns the length of the variable
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size_type length() const
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{
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return size();
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}
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/// Returns the length of the variable
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size_type size() const
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{
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return m_buffer.size() - 1;
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}
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bool_type empty() const
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{
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return 0u == size();
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}
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// Members
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private:
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typedef stlsoft_ns_qual(auto_buffer_old)< char_type
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, allocator_type
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> buffer_type_;
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buffer_type_ m_buffer;
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// Not to be implemented
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private:
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basic_environment_variable(basic_environment_variable const&);
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basic_environment_variable& operator =(basic_environment_variable const&);
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};
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/* /////////////////////////////////////////////////////////////////////////
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* Typedefs for commonly encountered types
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*/
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/** Specialisation of the basic_environment_variable template for the ANSI character type \c char
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*
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* \ingroup group__library__system
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*/
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typedef basic_environment_variable<ws_char_a_t, system_traits<ws_char_a_t> > environment_variable_a;
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/** Specialisation of the basic_environment_variable template for the Unicode character type \c wchar_t
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*
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* \ingroup group__library__system
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*/
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typedef basic_environment_variable<ws_char_w_t, system_traits<ws_char_w_t> > environment_variable_w;
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/** Specialisation of the basic_environment_variable template for the Win32 character type \c TCHAR
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*
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* \ingroup group__library__system
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*/
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typedef basic_environment_variable<TCHAR, system_traits<TCHAR> > environment_variable;
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/* /////////////////////////////////////////////////////////////////////////
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* Helper functions
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*/
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#if !defined(STLSOFT_COMPILER_IS_MSVC) || \
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_MSC_VER >= 1100
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/** This helper function makes an environment variable without needing to
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* qualify the template parameter.
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*
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* \ingroup group__library__system
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*/
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template<ss_typename_param_k C>
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inline basic_environment_variable<C> make_environment_variable(C const* path)
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{
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return basic_environment_variable<C>(path);
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}
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#endif /* compiler */
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////////////////////////////////////////////////////////////////////////////
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// Unit-testing
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#ifdef STLSOFT_UNITTEST
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# include "./unittest/environment_variable_unittest_.h"
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#endif /* STLSOFT_UNITTEST */
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/* ////////////////////////////////////////////////////////////////////// */
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#ifndef _WINSTL_NO_NAMESPACE
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# if defined(_STLSOFT_NO_NAMESPACE) || \
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defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
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} // namespace winstl
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# else
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} // namespace winstl_project
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} // namespace stlsoft
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# endif /* _STLSOFT_NO_NAMESPACE */
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#endif /* !_WINSTL_NO_NAMESPACE */
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/* ////////////////////////////////////////////////////////////////////// */
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#endif /* WINSTL_INCL_WINSTL_SYSTEM_HPP_ENVIRONMENT_VARIABLE */
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/* ///////////////////////////// end of file //////////////////////////// */
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