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Changed: Implement expandEnvironmentVariables function
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2 changed files with 79 additions and 0 deletions
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@ -360,6 +360,11 @@ sint launchProgramAndWaitForResult (const std::string &programName, const std::s
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/// This function executes a program and returns output as a string
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std::string getCommandOutput(const std::string &command);
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/// This function replace all environment variables in a string by their content.
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/// Environment variables names can use both Windows (%NAME%) and UNIX syntax ($NAME)
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/// Authorized characters in names are A-Z, a-z, 0-9 and _
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std::string expandEnvironmentVariables(const std::string &s);
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/// This function kills a program using his pid (on unix, it uses the kill() POSIX function)
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bool killProgram(uint32 pid);
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@ -913,6 +913,80 @@ std::string getCommandOutput(const std::string &command)
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return result;
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}
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std::string expandEnvironmentVariables(const std::string &s)
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{
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size_t len = s.length();
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std::string ret;
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std::string::size_type pos1 = 0, pos2 = 0;
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// look for environement variables delimiters
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while(pos2 < len && (pos1 = s.find_first_of("%$", pos2)) != std::string::npos)
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{
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// copy string unprocessed part
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ret += s.substr(pos2, pos1-pos2);
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// extract a valid variable name (a-zA-Z0-9_)
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pos2 = pos1+1;
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while(pos2 < len && (isalnum(s[pos2]) || s[pos2] == '_')) ++pos2;
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// check if variable name is empty
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bool found = pos2 > pos1+1;
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std::string name;
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if (found)
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{
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// found at least 1 character
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name = s.substr(pos1+1, pos2-pos1-1);
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}
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// Windows format needs a trailing % delimiter
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if (found && s[pos1] == '%')
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{
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if (pos2 >= len || s[pos2] != '%')
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{
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// not a variable name, because no trailing %
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found = false;
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}
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else
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{
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// found a trailing %, next character to check
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++pos2;
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}
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}
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// get variable value if name found
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if (found)
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{
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const char *value = getenv(name.c_str());
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if (value)
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{
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// value found
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ret += std::string(value);
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}
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else
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{
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// value not found
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found = false;
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}
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}
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if (!found)
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{
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// variable or value not found, don't evaluate variable
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ret += s.substr(pos1, pos2-pos1);
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}
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}
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// copy last unprocessed part
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ret += s.substr(pos2);
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return ret;
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}
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/*
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* Display the bits (with 0 and 1) composing a byte (from right to left)
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*/
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