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-rw-r--r--Source/cmStringCommand.cxx881
1 files changed, 881 insertions, 0 deletions
diff --git a/Source/cmStringCommand.cxx b/Source/cmStringCommand.cxx
new file mode 100644
index 000000000..ec10d571f
--- /dev/null
+++ b/Source/cmStringCommand.cxx
@@ -0,0 +1,881 @@
+/*============================================================================
+ CMake - Cross Platform Makefile Generator
+ Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+ Distributed under the OSI-approved BSD License (the "License");
+ see accompanying file Copyright.txt for details.
+
+ This software is distributed WITHOUT ANY WARRANTY; without even the
+ implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ See the License for more information.
+============================================================================*/
+#include "cmStringCommand.h"
+#include "cmCryptoHash.h"
+
+#include <cmsys/RegularExpression.hxx>
+#include <cmsys/SystemTools.hxx>
+
+#include <stdlib.h> // required for atoi
+#include <ctype.h>
+#include <time.h>
+
+//----------------------------------------------------------------------------
+bool cmStringCommand
+::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
+{
+ if(args.size() < 1)
+ {
+ this->SetError("must be called with at least one argument.");
+ return false;
+ }
+
+ const std::string &subCommand = args[0];
+ if(subCommand == "REGEX")
+ {
+ return this->HandleRegexCommand(args);
+ }
+ else if(subCommand == "REPLACE")
+ {
+ return this->HandleReplaceCommand(args);
+ }
+ else if ( subCommand == "MD5" ||
+ subCommand == "SHA1" ||
+ subCommand == "SHA224" ||
+ subCommand == "SHA256" ||
+ subCommand == "SHA384" ||
+ subCommand == "SHA512" )
+ {
+ return this->HandleHashCommand(args);
+ }
+ else if(subCommand == "TOLOWER")
+ {
+ return this->HandleToUpperLowerCommand(args, false);
+ }
+ else if(subCommand == "TOUPPER")
+ {
+ return this->HandleToUpperLowerCommand(args, true);
+ }
+ else if(subCommand == "COMPARE")
+ {
+ return this->HandleCompareCommand(args);
+ }
+ else if(subCommand == "ASCII")
+ {
+ return this->HandleAsciiCommand(args);
+ }
+ else if(subCommand == "CONFIGURE")
+ {
+ return this->HandleConfigureCommand(args);
+ }
+ else if(subCommand == "LENGTH")
+ {
+ return this->HandleLengthCommand(args);
+ }
+ else if(subCommand == "SUBSTRING")
+ {
+ return this->HandleSubstringCommand(args);
+ }
+ else if(subCommand == "STRIP")
+ {
+ return this->HandleStripCommand(args);
+ }
+ else if(subCommand == "RANDOM")
+ {
+ return this->HandleRandomCommand(args);
+ }
+ else if(subCommand == "FIND")
+ {
+ return this->HandleFindCommand(args);
+ }
+
+ std::string e = "does not recognize sub-command "+subCommand;
+ this->SetError(e.c_str());
+ return false;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleHashCommand(std::vector<std::string> const& args)
+{
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+ if(args.size() != 3)
+ {
+ cmOStringStream e;
+ e << args[0] << " requires an output variable and an input string";
+ this->SetError(e.str().c_str());
+ return false;
+ }
+
+ cmsys::auto_ptr<cmCryptoHash> hash(cmCryptoHash::New(args[0].c_str()));
+ if(hash.get())
+ {
+ std::string out = hash->HashString(args[2].c_str());
+ this->Makefile->AddDefinition(args[1].c_str(), out.c_str());
+ return true;
+ }
+ return false;
+#else
+ cmOStringStream e;
+ e << args[0] << " not available during bootstrap";
+ this->SetError(e.str().c_str());
+ return false;
+#endif
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleToUpperLowerCommand(
+ std::vector<std::string> const& args, bool toUpper)
+{
+ if ( args.size() < 3 )
+ {
+ this->SetError("no output variable specified");
+ return false;
+ }
+
+ std::string outvar = args[2];
+ std::string output;
+
+ if (toUpper)
+ {
+ output = cmSystemTools::UpperCase(args[1]);
+ }
+ else
+ {
+ output = cmSystemTools::LowerCase(args[1]);
+ }
+
+ // Store the output in the provided variable.
+ this->Makefile->AddDefinition(outvar.c_str(), output.c_str());
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleAsciiCommand(std::vector<std::string> const& args)
+{
+ if ( args.size() < 3 )
+ {
+ this->SetError("No output variable specified");
+ return false;
+ }
+ std::string::size_type cc;
+ std::string outvar = args[args.size()-1];
+ std::string output = "";
+ for ( cc = 1; cc < args.size()-1; cc ++ )
+ {
+ int ch = atoi(args[cc].c_str());
+ if ( ch > 0 && ch < 256 )
+ {
+ output += static_cast<char>(ch);
+ }
+ else
+ {
+ std::string error = "Character with code ";
+ error += args[cc];
+ error += " does not exist.";
+ this->SetError(error.c_str());
+ return false;
+ }
+ }
+ // Store the output in the provided variable.
+ this->Makefile->AddDefinition(outvar.c_str(), output.c_str());
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleConfigureCommand(
+ std::vector<std::string> const& args)
+{
+ if ( args.size() < 2 )
+ {
+ this->SetError("No input string specified.");
+ return false;
+ }
+ else if ( args.size() < 3 )
+ {
+ this->SetError("No output variable specified.");
+ return false;
+ }
+
+ // Parse options.
+ bool escapeQuotes = false;
+ bool atOnly = false;
+ for(unsigned int i = 3; i < args.size(); ++i)
+ {
+ if(args[i] == "@ONLY")
+ {
+ atOnly = true;
+ }
+ else if(args[i] == "ESCAPE_QUOTES")
+ {
+ escapeQuotes = true;
+ }
+ else
+ {
+ cmOStringStream err;
+ err << "Unrecognized argument \"" << args[i] << "\"";
+ this->SetError(err.str().c_str());
+ return false;
+ }
+ }
+
+ // Configure the string.
+ std::string output;
+ this->Makefile->ConfigureString(args[1], output, atOnly, escapeQuotes);
+
+ // Store the output in the provided variable.
+ this->Makefile->AddDefinition(args[2].c_str(), output.c_str());
+
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleRegexCommand(std::vector<std::string> const& args)
+{
+ if(args.size() < 2)
+ {
+ this->SetError("sub-command REGEX requires a mode to be specified.");
+ return false;
+ }
+ std::string mode = args[1];
+ if(mode == "MATCH")
+ {
+ if(args.size() < 5)
+ {
+ this->SetError("sub-command REGEX, mode MATCH needs "
+ "at least 5 arguments total to command.");
+ return false;
+ }
+ return this->RegexMatch(args);
+ }
+ else if(mode == "MATCHALL")
+ {
+ if(args.size() < 5)
+ {
+ this->SetError("sub-command REGEX, mode MATCHALL needs "
+ "at least 5 arguments total to command.");
+ return false;
+ }
+ return this->RegexMatchAll(args);
+ }
+ else if(mode == "REPLACE")
+ {
+ if(args.size() < 6)
+ {
+ this->SetError("sub-command REGEX, mode REPLACE needs "
+ "at least 6 arguments total to command.");
+ return false;
+ }
+ return this->RegexReplace(args);
+ }
+
+ std::string e = "sub-command REGEX does not recognize mode "+mode;
+ this->SetError(e.c_str());
+ return false;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::RegexMatch(std::vector<std::string> const& args)
+{
+ //"STRING(REGEX MATCH <regular_expression> <output variable>
+ // <input> [<input>...])\n";
+ std::string regex = args[2];
+ std::string outvar = args[3];
+
+ // Concatenate all the last arguments together.
+ std::string input = args[4];
+ for(unsigned int i=5; i < args.size(); ++i)
+ {
+ input += args[i];
+ }
+
+ this->ClearMatches(this->Makefile);
+ // Compile the regular expression.
+ cmsys::RegularExpression re;
+ if(!re.compile(regex.c_str()))
+ {
+ std::string e =
+ "sub-command REGEX, mode MATCH failed to compile regex \""+regex+"\".";
+ this->SetError(e.c_str());
+ return false;
+ }
+
+ // Scan through the input for all matches.
+ std::string output;
+ if(re.find(input.c_str()))
+ {
+ this->StoreMatches(this->Makefile, re);
+ std::string::size_type l = re.start();
+ std::string::size_type r = re.end();
+ if(r-l == 0)
+ {
+ std::string e =
+ "sub-command REGEX, mode MATCH regex \""+regex+
+ "\" matched an empty string.";
+ this->SetError(e.c_str());
+ return false;
+ }
+ output = input.substr(l, r-l);
+ }
+
+ // Store the output in the provided variable.
+ this->Makefile->AddDefinition(outvar.c_str(), output.c_str());
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::RegexMatchAll(std::vector<std::string> const& args)
+{
+ //"STRING(REGEX MATCHALL <regular_expression> <output variable> <input>
+ // [<input>...])\n";
+ std::string regex = args[2];
+ std::string outvar = args[3];
+
+ // Concatenate all the last arguments together.
+ std::string input = args[4];
+ for(unsigned int i=5; i < args.size(); ++i)
+ {
+ input += args[i];
+ }
+
+ this->ClearMatches(this->Makefile);
+ // Compile the regular expression.
+ cmsys::RegularExpression re;
+ if(!re.compile(regex.c_str()))
+ {
+ std::string e =
+ "sub-command REGEX, mode MATCHALL failed to compile regex \""+
+ regex+"\".";
+ this->SetError(e.c_str());
+ return false;
+ }
+
+ // Scan through the input for all matches.
+ std::string output;
+ const char* p = input.c_str();
+ while(re.find(p))
+ {
+ this->StoreMatches(this->Makefile, re);
+ std::string::size_type l = re.start();
+ std::string::size_type r = re.end();
+ if(r-l == 0)
+ {
+ std::string e = "sub-command REGEX, mode MATCHALL regex \""+
+ regex+"\" matched an empty string.";
+ this->SetError(e.c_str());
+ return false;
+ }
+ if(output.length() > 0)
+ {
+ output += ";";
+ }
+ output += std::string(p+l, r-l);
+ p += r;
+ }
+
+ // Store the output in the provided variable.
+ this->Makefile->AddDefinition(outvar.c_str(), output.c_str());
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::RegexReplace(std::vector<std::string> const& args)
+{
+ //"STRING(REGEX REPLACE <regular_expression> <replace_expression>
+ // <output variable> <input> [<input>...])\n"
+ std::string regex = args[2];
+ std::string replace = args[3];
+ std::string outvar = args[4];
+
+ // Pull apart the replace expression to find the escaped [0-9] values.
+ std::vector<RegexReplacement> replacement;
+ std::string::size_type l = 0;
+ while(l < replace.length())
+ {
+ std::string::size_type r = replace.find("\\", l);
+ if(r == std::string::npos)
+ {
+ r = replace.length();
+ replacement.push_back(replace.substr(l, r-l));
+ }
+ else
+ {
+ if(r-l > 0)
+ {
+ replacement.push_back(replace.substr(l, r-l));
+ }
+ if(r == (replace.length()-1))
+ {
+ this->SetError("sub-command REGEX, mode REPLACE: "
+ "replace-expression ends in a backslash.");
+ return false;
+ }
+ if((replace[r+1] >= '0') && (replace[r+1] <= '9'))
+ {
+ replacement.push_back(replace[r+1]-'0');
+ }
+ else if(replace[r+1] == 'n')
+ {
+ replacement.push_back("\n");
+ }
+ else if(replace[r+1] == '\\')
+ {
+ replacement.push_back("\\");
+ }
+ else
+ {
+ std::string e = "sub-command REGEX, mode REPLACE: Unknown escape \"";
+ e += replace.substr(r, 2);
+ e += "\" in replace-expression.";
+ this->SetError(e.c_str());
+ return false;
+ }
+ r += 2;
+ }
+ l = r;
+ }
+
+ // Concatenate all the last arguments together.
+ std::string input = args[5];
+ for(unsigned int i=6; i < args.size(); ++i)
+ {
+ input += args[i];
+ }
+
+ this->ClearMatches(this->Makefile);
+ // Compile the regular expression.
+ cmsys::RegularExpression re;
+ if(!re.compile(regex.c_str()))
+ {
+ std::string e =
+ "sub-command REGEX, mode REPLACE failed to compile regex \""+
+ regex+"\".";
+ this->SetError(e.c_str());
+ return false;
+ }
+
+ // Scan through the input for all matches.
+ std::string output;
+ std::string::size_type base = 0;
+ while(re.find(input.c_str()+base))
+ {
+ this->StoreMatches(this->Makefile, re);
+ std::string::size_type l2 = re.start();
+ std::string::size_type r = re.end();
+
+ // Concatenate the part of the input that was not matched.
+ output += input.substr(base, l2);
+
+ // Make sure the match had some text.
+ if(r-l2 == 0)
+ {
+ std::string e = "sub-command REGEX, mode REPLACE regex \""+
+ regex+"\" matched an empty string.";
+ this->SetError(e.c_str());
+ return false;
+ }
+
+ // Concatenate the replacement for the match.
+ for(unsigned int i=0; i < replacement.size(); ++i)
+ {
+ if(replacement[i].number < 0)
+ {
+ // This is just a plain-text part of the replacement.
+ output += replacement[i].value;
+ }
+ else
+ {
+ // Replace with part of the match.
+ int n = replacement[i].number;
+ std::string::size_type start = re.start(n);
+ std::string::size_type end = re.end(n);
+ std::string::size_type len = input.length()-base;
+ if((start != std::string::npos) && (end != std::string::npos) &&
+ (start <= len) && (end <= len))
+ {
+ output += input.substr(base+start, end-start);
+ }
+ else
+ {
+ std::string e =
+ "sub-command REGEX, mode REPLACE: replace expression \""+
+ replace+"\" contains an out-of-range escape for regex \""+
+ regex+"\".";
+ this->SetError(e.c_str());
+ return false;
+ }
+ }
+ }
+
+ // Move past the match.
+ base += r;
+ }
+
+ // Concatenate the text after the last match.
+ output += input.substr(base, input.length()-base);
+
+ // Store the output in the provided variable.
+ this->Makefile->AddDefinition(outvar.c_str(), output.c_str());
+ return true;
+}
+
+//----------------------------------------------------------------------------
+void cmStringCommand::ClearMatches(cmMakefile* mf)
+{
+ for (unsigned int i=0; i<10; i++)
+ {
+ char name[128];
+ sprintf(name, "CMAKE_MATCH_%d", i);
+ mf->AddDefinition(name, "");
+ mf->MarkVariableAsUsed(name);
+ }
+}
+
+//----------------------------------------------------------------------------
+void cmStringCommand::StoreMatches(cmMakefile* mf,cmsys::RegularExpression& re)
+{
+ for (unsigned int i=0; i<10; i++)
+ {
+ char name[128];
+ sprintf(name, "CMAKE_MATCH_%d", i);
+ mf->AddDefinition(name, re.match(i).c_str());
+ mf->MarkVariableAsUsed(name);
+ }
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleFindCommand(std::vector<std::string> const&
+ args)
+{
+ // check if all required parameters were passed
+ if(args.size() < 4 || args.size() > 5)
+ {
+ this->SetError("sub-command FIND requires 3 or 4 parameters.");
+ return false;
+ }
+
+ // check if the reverse flag was set or not
+ bool reverseMode = false;
+ if(args.size() == 5 && args[4] == "REVERSE")
+ {
+ reverseMode = true;
+ }
+
+ // if we have 5 arguments the last one must be REVERSE
+ if(args.size() == 5 && args[4] != "REVERSE")
+ {
+ this->SetError("sub-command FIND: unknown last parameter");
+ return false;
+ }
+
+ // local parameter names.
+ const std::string& sstring = args[1];
+ const std::string& schar = args[2];
+ const std::string& outvar = args[3];
+
+ // ensure that the user cannot accidentally specify REVERSE as a variable
+ if(outvar == "REVERSE")
+ {
+ this->SetError("sub-command FIND does not allow to select REVERSE as "
+ "the output variable. "
+ "Maybe you missed the actual output variable?");
+ return false;
+ }
+
+ // try to find the character and return its position
+ size_t pos;
+ if(!reverseMode)
+ {
+ pos = sstring.find(schar);
+ }
+ else
+ {
+ pos = sstring.rfind(schar);
+ }
+ if(std::string::npos != pos)
+ {
+ cmOStringStream s;
+ s << pos;
+ this->Makefile->AddDefinition(outvar.c_str(), s.str().c_str());
+ return true;
+ }
+
+ // the character was not found, but this is not really an error
+ this->Makefile->AddDefinition(outvar.c_str(), "-1");
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleCompareCommand(std::vector<std::string> const&
+ args)
+{
+ if(args.size() < 2)
+ {
+ this->SetError("sub-command COMPARE requires a mode to be specified.");
+ return false;
+ }
+ std::string mode = args[1];
+ if((mode == "EQUAL") || (mode == "NOTEQUAL") ||
+ (mode == "LESS") || (mode == "GREATER"))
+ {
+ if(args.size() < 5)
+ {
+ std::string e = "sub-command COMPARE, mode ";
+ e += mode;
+ e += " needs at least 5 arguments total to command.";
+ this->SetError(e.c_str());
+ return false;
+ }
+
+ const std::string& left = args[2];
+ const std::string& right = args[3];
+ const std::string& outvar = args[4];
+ bool result;
+ if(mode == "LESS")
+ {
+ result = (left < right);
+ }
+ else if(mode == "GREATER")
+ {
+ result = (left > right);
+ }
+ else if(mode == "EQUAL")
+ {
+ result = (left == right);
+ }
+ else // if(mode == "NOTEQUAL")
+ {
+ result = !(left == right);
+ }
+ if(result)
+ {
+ this->Makefile->AddDefinition(outvar.c_str(), "1");
+ }
+ else
+ {
+ this->Makefile->AddDefinition(outvar.c_str(), "0");
+ }
+ return true;
+ }
+ std::string e = "sub-command COMPARE does not recognize mode "+mode;
+ this->SetError(e.c_str());
+ return false;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleReplaceCommand(std::vector<std::string> const&
+ args)
+{
+ if(args.size() < 5)
+ {
+ this->SetError("sub-command REPLACE requires at least four arguments.");
+ return false;
+ }
+
+ const std::string& matchExpression = args[1];
+ const std::string& replaceExpression = args[2];
+ const std::string& variableName = args[3];
+
+ std::string input = args[4];
+ for(unsigned int i=5; i < args.size(); ++i)
+ {
+ input += args[i];
+ }
+
+ cmsys::SystemTools::ReplaceString(input, matchExpression.c_str(),
+ replaceExpression.c_str());
+
+ this->Makefile->AddDefinition(variableName.c_str(), input.c_str());
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleSubstringCommand(std::vector<std::string> const&
+ args)
+{
+ if(args.size() != 5)
+ {
+ this->SetError("sub-command SUBSTRING requires four arguments.");
+ return false;
+ }
+
+ const std::string& stringValue = args[1];
+ int begin = atoi(args[2].c_str());
+ int end = atoi(args[3].c_str());
+ const std::string& variableName = args[4];
+
+ size_t stringLength = stringValue.size();
+ int intStringLength = static_cast<int>(stringLength);
+ if ( begin < 0 || begin > intStringLength )
+ {
+ cmOStringStream ostr;
+ ostr << "begin index: " << begin << " is out of range 0 - "
+ << stringLength;
+ this->SetError(ostr.str().c_str());
+ return false;
+ }
+ int leftOverLength = intStringLength - begin;
+ if ( end < -1 || end > leftOverLength )
+ {
+ cmOStringStream ostr;
+ ostr << "end index: " << end << " is out of range -1 - "
+ << leftOverLength;
+ this->SetError(ostr.str().c_str());
+ return false;
+ }
+
+ this->Makefile->AddDefinition(variableName.c_str(),
+ stringValue.substr(begin, end).c_str());
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand
+::HandleLengthCommand(std::vector<std::string> const& args)
+{
+ if(args.size() != 3)
+ {
+ this->SetError("sub-command LENGTH requires two arguments.");
+ return false;
+ }
+
+ const std::string& stringValue = args[1];
+ const std::string& variableName = args[2];
+
+ size_t length = stringValue.size();
+ char buffer[1024];
+ sprintf(buffer, "%d", static_cast<int>(length));
+
+ this->Makefile->AddDefinition(variableName.c_str(), buffer);
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand::HandleStripCommand(
+ std::vector<std::string> const& args)
+{
+ if(args.size() != 3)
+ {
+ this->SetError("sub-command STRIP requires two arguments.");
+ return false;
+ }
+
+ const std::string& stringValue = args[1];
+ const std::string& variableName = args[2];
+ size_t inStringLength = stringValue.size();
+ size_t startPos = inStringLength + 1;
+ size_t endPos = 0;
+ const char* ptr = stringValue.c_str();
+ size_t cc;
+ for ( cc = 0; cc < inStringLength; ++ cc )
+ {
+ if ( !isspace(*ptr) )
+ {
+ if ( startPos > inStringLength )
+ {
+ startPos = cc;
+ }
+ endPos = cc;
+ }
+ ++ ptr;
+ }
+
+ size_t outLength = 0;
+
+ // if the input string didn't contain any non-space characters, return
+ // an empty string
+ if (startPos > inStringLength)
+ {
+ outLength = 0;
+ startPos = 0;
+ }
+ else
+ {
+ outLength=endPos - startPos + 1;
+ }
+
+ this->Makefile->AddDefinition(variableName.c_str(),
+ stringValue.substr(startPos, outLength).c_str());
+ return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmStringCommand
+::HandleRandomCommand(std::vector<std::string> const& args)
+{
+ if(args.size() < 2 || args.size() == 3 || args.size() == 5)
+ {
+ this->SetError("sub-command RANDOM requires at least one argument.");
+ return false;
+ }
+
+ static bool seeded = false;
+ bool force_seed = false;
+ unsigned int seed = 0;
+ int length = 5;
+ const char cmStringCommandDefaultAlphabet[] = "qwertyuiopasdfghjklzxcvbnm"
+ "QWERTYUIOPASDFGHJKLZXCVBNM"
+ "0123456789";
+ std::string alphabet;
+
+ if ( args.size() > 3 )
+ {
+ size_t i = 1;
+ size_t stopAt = args.size() - 2;
+
+ for ( ; i < stopAt; ++i )
+ {
+ if ( args[i] == "LENGTH" )
+ {
+ ++i;
+ length = atoi(args[i].c_str());
+ }
+ else if ( args[i] == "ALPHABET" )
+ {
+ ++i;
+ alphabet = args[i];
+ }
+ else if ( args[i] == "RANDOM_SEED" )
+ {
+ ++i;
+ seed = static_cast<unsigned int>(atoi(args[i].c_str()));
+ force_seed = true;
+ }
+ }
+ }
+ if ( !alphabet.size() )
+ {
+ alphabet = cmStringCommandDefaultAlphabet;
+ }
+
+ double sizeofAlphabet = static_cast<double>(alphabet.size());
+ if ( sizeofAlphabet < 1 )
+ {
+ this->SetError("sub-command RANDOM invoked with bad alphabet.");
+ return false;
+ }
+ if ( length < 1 )
+ {
+ this->SetError("sub-command RANDOM invoked with bad length.");
+ return false;
+ }
+ const std::string& variableName = args[args.size()-1];
+
+ std::vector<char> result;
+
+ if (!seeded || force_seed)
+ {
+ seeded = true;
+ srand(force_seed? seed : cmSystemTools::RandomSeed());
+ }
+
+ const char* alphaPtr = alphabet.c_str();
+ int cc;
+ for ( cc = 0; cc < length; cc ++ )
+ {
+ int idx=(int) (sizeofAlphabet* rand()/(RAND_MAX+1.0));
+ result.push_back(*(alphaPtr + idx));
+ }
+ result.push_back(0);
+
+ this->Makefile->AddDefinition(variableName.c_str(), &*result.begin());
+ return true;
+}