2 * \file environment.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author Angus Leeming
7 * \author João Luis M. Assirati
8 * \author Lars Gullik Bjønnes
10 * Full author contact details are available in file CREDITS.
15 #include "support/environment.h"
17 #include "support/docstring.h"
18 #include "support/os.h"
20 #include <boost/tokenizer.hpp>
21 #include <boost/shared_array.hpp>
34 string const getEnv(string const & envname)
36 // f.ex. what about error checking?
37 char const * const ch = getenv(envname.c_str());
38 return ch ? to_utf8(from_local8bit(ch)) : string();
42 vector<string> const getEnvPath(string const & name)
44 typedef boost::char_separator<char> Separator;
45 typedef boost::tokenizer<Separator> Tokenizer;
47 string const env_var = getEnv(name);
48 Separator const separator(string(1, os::path_separator()).c_str());
49 Tokenizer const tokens(env_var, separator);
50 Tokenizer::const_iterator it = tokens.begin();
51 Tokenizer::const_iterator const end = tokens.end();
53 std::vector<string> vars;
54 for (; it != end; ++it)
55 vars.push_back(os::internal_path(*it));
61 bool setEnv(string const & name, string const & value)
63 // CHECK Look at and fix this.
64 // f.ex. what about error checking?
66 string const encoded = to_local8bit(from_utf8(value));
67 #if defined (HAVE_SETENV)
68 return ::setenv(name.c_str(), encoded.c_str(), true);
69 #elif defined (HAVE_PUTENV)
70 static std::map<string, boost::shared_array<char> > varmap;
72 string envstr = name + '=' + encoded;
73 boost::shared_array<char> newptr(new char[envstr.size() + 1]);
74 envstr.copy(newptr.get(), envstr.length());
75 newptr.get()[envstr.length()] = '\0';
76 bool const retval = ::putenv(newptr.get()) == 0;
78 varmap[name] = newptr;
81 #error No environment-setting function has been defined.
87 void setEnvPath(string const & name, vector<string> const & env)
89 char const separator(os::path_separator());
90 std::ostringstream ss;
91 vector<string>::const_iterator const begin = env.begin();
92 vector<string>::const_iterator const end = env.end();
93 vector<string>::const_iterator it = begin;
94 for (; it != end; ++it) {
97 ss << os::external_path(*it);
99 setEnv(name, ss.str());
103 void prependEnvPath(string const & name, string const & prefix)
105 vector<string> env_var = getEnvPath(name);
107 typedef boost::char_separator<char> Separator;
108 typedef boost::tokenizer<Separator> Tokenizer;
110 Separator const separator(string(1, os::path_separator()).c_str());
112 // Prepend each new element to the list, removing identical elements
113 // that occur later in the list.
114 Tokenizer const tokens(prefix, separator);
115 vector<string> reversed_tokens(tokens.begin(), tokens.end());
117 typedef vector<string>::const_reverse_iterator token_iterator;
118 token_iterator it = reversed_tokens.rbegin();
119 token_iterator const end = reversed_tokens.rend();
120 for (; it != end; ++it) {
121 vector<string>::iterator remove_it =
122 std::remove(env_var.begin(), env_var.end(), *it);
123 env_var.erase(remove_it, env_var.end());
124 env_var.insert(env_var.begin(), *it);
127 setEnvPath(name, env_var);
130 } // namespace support