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fdbe775b9f
for possible thread conflicts, of the sort Georg resolved at
6a30211f. I have made static variables const where possible,
and marked cases that looked potentially problematic with the
comment:
// FIXME THREAD
Many of these definitely are vulnerable to concurrent access, such
as the static variables declared at the start of output_latex.cpp.
Suppose, e.g., we were outputting latex and also displaying the
source of a different document.
I'd appreciate it if others could grep for "FIXME THREAD" and see
if some of these are harmless, or what.
151 lines
3.9 KiB
C++
151 lines
3.9 KiB
C++
/**
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* \file environment.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Angus Leeming
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* \author João Luis M. Assirati
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* \author Lars Gullik Bjønnes
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "support/environment.h"
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#include "support/docstring.h"
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#include "support/os.h"
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#include <boost/tokenizer.hpp>
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#include <cstdlib>
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#include <map>
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#include <sstream>
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using namespace std;
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namespace lyx {
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namespace support {
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bool hasEnv(string const & name)
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{
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return getenv(name.c_str());
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}
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string const getEnv(string const & name)
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{
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// f.ex. what about error checking?
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char const * const ch = getenv(name.c_str());
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return ch ? to_utf8(from_local8bit(ch)) : string();
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}
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vector<string> const getEnvPath(string const & name)
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{
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typedef boost::char_separator<char> Separator;
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typedef boost::tokenizer<Separator> Tokenizer;
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string const env_var = getEnv(name);
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Separator const separator(string(1, os::path_separator()).c_str());
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Tokenizer const tokens(env_var, separator);
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Tokenizer::const_iterator it = tokens.begin();
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Tokenizer::const_iterator const end = tokens.end();
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vector<string> vars;
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for (; it != end; ++it)
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vars.push_back(os::internal_path(*it));
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return vars;
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}
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bool setEnv(string const & name, string const & value)
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{
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// CHECK Look at and fix this.
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// f.ex. what about error checking?
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string const encoded = to_local8bit(from_utf8(value));
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#if defined (HAVE_SETENV)
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return ::setenv(name.c_str(), encoded.c_str(), 1) == 0;
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#elif defined (HAVE_PUTENV)
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// According to http://pubs.opengroup.org/onlinepubs/9699919799/functions/putenv.html
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// the argument of putenv() needs to be static, because changing its
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// value will change the environment. Therefore we need a different static
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// storage for each variable.
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// FIXME THREAD
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static map<string, string> varmap;
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varmap[name] = name + '=' + encoded;
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return ::putenv(const_cast<char*>(varmap[name].c_str())) == 0;
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#else
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#error No environment-setting function has been defined.
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#endif
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return false;
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}
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void setEnvPath(string const & name, vector<string> const & env)
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{
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char const separator(os::path_separator());
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ostringstream ss;
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vector<string>::const_iterator const begin = env.begin();
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vector<string>::const_iterator const end = env.end();
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vector<string>::const_iterator it = begin;
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for (; it != end; ++it) {
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if (it != begin)
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ss << separator;
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ss << os::external_path(*it);
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}
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setEnv(name, ss.str());
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}
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void prependEnvPath(string const & name, string const & prefix)
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{
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vector<string> env_var = getEnvPath(name);
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typedef boost::char_separator<char> Separator;
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typedef boost::tokenizer<Separator> Tokenizer;
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Separator const separator(string(1, os::path_separator()).c_str());
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// Prepend each new element to the list, removing identical elements
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// that occur later in the list.
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Tokenizer const tokens(prefix, separator);
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vector<string> reversed_tokens(tokens.begin(), tokens.end());
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typedef vector<string>::const_reverse_iterator token_iterator;
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token_iterator it = reversed_tokens.rbegin();
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token_iterator const end = reversed_tokens.rend();
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for (; it != end; ++it) {
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vector<string>::iterator remove_it =
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remove(env_var.begin(), env_var.end(), *it);
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env_var.erase(remove_it, env_var.end());
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env_var.insert(env_var.begin(), *it);
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}
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setEnvPath(name, env_var);
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}
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bool unsetEnv(string const & name)
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{
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#if defined(HAVE_UNSETENV)
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// FIXME: does it leak?
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return ::unsetenv(name.c_str()) == 0;
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#elif defined(HAVE_PUTENV)
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// This is OK with MSVC and MinGW at least.
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// The argument of putenv() does not need to be a static variable in this
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// case, since the variable is removed from the environment.
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return ::putenv(const_cast<char*>((name + "=").c_str())) == 0;
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#else
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#error No environment-unsetting function has been defined.
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#endif
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}
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} // namespace support
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} // namespace lyx
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