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>
33 string const getEnv(string const & envname)
35 // f.ex. what about error checking?
36 char const * const ch = getenv(envname.c_str());
37 return ch ? to_utf8(from_local8bit(ch)) : string();
41 vector<string> const getEnvPath(string const & name)
43 typedef boost::char_separator<char> Separator;
44 typedef boost::tokenizer<Separator> Tokenizer;
46 string const env_var = getEnv(name);
47 Separator const separator(string(1, os::path_separator()).c_str());
48 Tokenizer const tokens(env_var, separator);
49 Tokenizer::const_iterator it = tokens.begin();
50 Tokenizer::const_iterator const end = tokens.end();
52 std::vector<string> vars;
53 for (; it != end; ++it)
54 vars.push_back(os::internal_path(*it));
60 bool setEnv(string const & name, string const & value)
62 // CHECK Look at and fix this.
63 // f.ex. what about error checking?
65 string const encoded = to_local8bit(from_utf8(value));
66 #if defined (HAVE_SETENV)
67 return ::setenv(name.c_str(), encoded.c_str(), true);
69 #elif defined (HAVE_PUTENV)
70 static std::map<string, char *> varmap;
72 string envstr = name + '=' + encoded;
73 char * newptr = new char[envstr.size() + 1];
74 envstr.copy(newptr, envstr.length());
75 newptr[envstr.length()] = '\0';
76 int const retval = ::putenv(newptr);
78 char * oldptr = varmap[name];
81 varmap[name] = newptr;
85 #error No environment-setting function has been defined.
91 void setEnvPath(string const & name, vector<string> const & env)
93 char const separator(os::path_separator());
94 std::ostringstream ss;
95 vector<string>::const_iterator const begin = env.begin();
96 vector<string>::const_iterator const end = env.end();
97 vector<string>::const_iterator it = begin;
98 for (; it != end; ++it) {
101 ss << os::external_path(*it);
103 setEnv(name, ss.str());
107 void prependEnvPath(string const & name, string const & prefix)
109 vector<string> env_var = getEnvPath(name);
111 typedef boost::char_separator<char> Separator;
112 typedef boost::tokenizer<Separator> Tokenizer;
114 Separator const separator(string(1, os::path_separator()).c_str());
116 // Prepend each new element to the list, removing identical elements
117 // that occur later in the list.
118 Tokenizer const tokens(prefix, separator);
119 vector<string> reversed_tokens(tokens.begin(), tokens.end());
121 typedef vector<string>::const_reverse_iterator token_iterator;
122 token_iterator it = reversed_tokens.rbegin();
123 token_iterator const end = reversed_tokens.rend();
124 for (; it != end; ++it) {
125 vector<string>::iterator remove_it =
126 std::remove(env_var.begin(), env_var.end(), *it);
127 env_var.erase(remove_it, env_var.end());
128 env_var.insert(env_var.begin(), *it);
131 setEnvPath(name, env_var);
134 } // namespace support