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>
31 string const getEnv(string const & envname)
33 // f.ex. what about error checking?
34 char const * const ch = getenv(envname.c_str());
35 string const envstr = !ch ? "" : ch;
40 vector<string> const getEnvPath(string const & name)
42 typedef boost::char_separator<char> Separator;
43 typedef boost::tokenizer<Separator> Tokenizer;
45 string const env_var = getEnv(name);
46 Separator const separator(string(1, os::path_separator()).c_str());
47 Tokenizer const tokens(env_var, separator);
48 Tokenizer::const_iterator it = tokens.begin();
49 Tokenizer::const_iterator const end = tokens.end();
51 std::vector<string> vars;
52 for (; it != end; ++it)
53 vars.push_back(os::internal_path(*it));
59 bool setEnv(string const & name, string const & value)
61 // CHECK Look at and fix this.
62 // f.ex. what about error checking?
64 #if defined (HAVE_SETENV)
65 int const retval = ::setenv(name.c_str(), value.c_str(), true);
67 #elif defined (HAVE_PUTENV)
68 static std::map<string, char *> varmap;
70 string envstr = name + '=' + value;
71 char * newptr = new char[envstr.size() + 1];
72 envstr.copy(newptr, envstr.length());
73 newptr[envstr.length()] = '\0';
74 int const retval = ::putenv(newptr);
76 char * oldptr = varmap[name];
79 varmap[name] = newptr;
82 #error No environment-setting function has been defined.
88 void setEnvPath(string const & name, vector<string> const & env)
90 char const separator(os::path_separator());
91 std::ostringstream ss;
92 vector<string>::const_iterator it = env.begin();
93 vector<string>::const_iterator const end = env.end();
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