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//
// Copyright (c) 2012 Artyom Beilis (Tonkikh)
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_NOWIDE_CENV_H_INCLUDED
#define BOOST_NOWIDE_CENV_H_INCLUDED
#include <string>
#include <stdexcept>
#include <stdlib.h>
#include <boost/config.hpp>
#include <boost/nowide/stackstring.hpp>
#include <vector>
#ifdef BOOST_WINDOWS
#include <boost/nowide/windows.hpp>
#endif
namespace boost {
namespace nowide {
#if !defined(BOOST_WINDOWS) && !defined(BOOST_NOWIDE_DOXYGEN)
using ::getenv;
using ::setenv;
using ::unsetenv;
using ::putenv;
#else
///
/// \brief UTF-8 aware getenv. Returns 0 if the variable is not set.
///
/// This function is not thread safe or reenterable as defined by the standard library
///
inline char *getenv(char const *key)
{
static stackstring value;
wshort_stackstring name;
if(!name.convert(key))
return 0;
static const size_t buf_size = 64;
wchar_t buf[buf_size];
std::vector<wchar_t> tmp;
wchar_t *ptr = buf;
size_t n = GetEnvironmentVariableW(name.c_str(),buf,buf_size);
if(n == 0 && GetLastError() == 203) // ERROR_ENVVAR_NOT_FOUND
return 0;
if(n >= buf_size) {
tmp.resize(n+1,L'\0');
n = GetEnvironmentVariableW(name.c_str(),&tmp[0],static_cast<unsigned>(tmp.size() - 1));
// The size may have changed
if(n >= tmp.size() - 1)
return 0;
ptr = &tmp[0];
}
if(!value.convert(ptr))
return 0;
return value.c_str();
}
///
/// \brief UTF-8 aware setenv, \a key - the variable name, \a value is a new UTF-8 value,
///
/// if override is not 0, that the old value is always overridded, otherwise,
/// if the variable exists it remains unchanged
///
inline int setenv(char const *key,char const *value,int override)
{
wshort_stackstring name;
if(!name.convert(key))
return -1;
if(!override) {
wchar_t unused[2];
if(!(GetEnvironmentVariableW(name.c_str(),unused,2)==0 && GetLastError() == 203)) // ERROR_ENVVAR_NOT_FOUND
return 0;
}
wstackstring wval;
if(!wval.convert(value))
return -1;
if(SetEnvironmentVariableW(name.c_str(),wval.c_str()))
return 0;
return -1;
}
///
/// \brief Remove enviroment variable \a key
///
inline int unsetenv(char const *key)
{
wshort_stackstring name;
if(!name.convert(key))
return -1;
if(SetEnvironmentVariableW(name.c_str(),0))
return 0;
return -1;
}
///
/// \brief UTF-8 aware putenv implementation, expects string in format KEY=VALUE
///
inline int putenv(char *string)
{
char const *key = string;
char const *key_end = string;
while(*key_end != '=' && *key_end != 0)
++ key_end;
if(*key_end == 0)
return -1;
wshort_stackstring wkey;
if(!wkey.convert(key,key_end))
return -1;
wstackstring wvalue;
if(!wvalue.convert(key_end+1))
return -1;
if(SetEnvironmentVariableW(wkey.c_str(),wvalue.c_str()))
return 0;
return -1;
}
#endif
} // nowide
} // namespace boost
#endif
///
// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
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