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"
16 #include "support/os.h"
18 #include <boost/tokenizer.hpp>
30 string const getEnv(string const & envname)
32 // f.ex. what about error checking?
33 char const * const ch = getenv(envname.c_str());
34 string const envstr = !ch ? "" : ch;
39 vector<string> const getEnvPath(string const & name)
41 typedef boost::char_separator<char> Separator;
42 typedef boost::tokenizer<Separator> Tokenizer;
44 string const env_var = getEnv(name);
45 Separator const separator(string(1, os::path_separator()).c_str());
46 Tokenizer const tokens(env_var, separator);
47 Tokenizer::const_iterator it = tokens.begin();
48 Tokenizer::const_iterator const end = tokens.end();
50 std::vector<string> vars;
51 for (; it != end; ++it)
52 vars.push_back(os::internal_path(*it));
58 bool setEnv(string const & name, string const & value)
60 // CHECK Look at and fix this.
61 // f.ex. what about error checking?
63 #if defined (HAVE_SETENV)
64 int const retval = ::setenv(name.c_str(), value.c_str(), true);
66 #elif defined (HAVE_PUTENV)
67 static std::map<string, char *> varmap;
69 string envstr = name + '=' + value;
70 char * newptr = new char[envstr.size() + 1];
71 envstr.copy(newptr, envstr.length());
72 newptr[envstr.length()] = '\0';
73 int const retval = ::putenv(newptr);
75 char * oldptr = varmap[name];
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 it = env.begin();
92 vector<string>::const_iterator const end = env.end();
93 for (; it != end; ++it) {
96 ss << os::external_path(*it);
98 setEnv(name, ss.str());
102 void prependEnvPath(string const & name, string const & prefix)
104 vector<string> env_var = getEnvPath(name);
106 typedef boost::char_separator<char> Separator;
107 typedef boost::tokenizer<Separator> Tokenizer;
109 Separator const separator(string(1, os::path_separator()).c_str());
111 // Prepend each new element to the list, removing identical elements
112 // that occur later in the list.
113 Tokenizer const tokens(prefix, separator);
114 vector<string> reversed_tokens(tokens.begin(), tokens.end());
116 typedef vector<string>::const_reverse_iterator token_iterator;
117 token_iterator it = reversed_tokens.rbegin();
118 token_iterator const end = reversed_tokens.rend();
119 for (; it != end; ++it) {
120 vector<string>::iterator remove_it =
121 std::remove(env_var.begin(), env_var.end(), *it);
122 env_var.erase(remove_it, env_var.end());
123 env_var.insert(env_var.begin(), *it);
126 setEnvPath(name, env_var);
129 } // namespace support