Use better KWSys SystemTools::GetEnv and HasEnv signatures

24 files changed, 134 insertions, 110 deletions

diff --git a/Source/CPack/cmCPackGenerator.cxx b/Source/CPack/cmCPackGenerator.cxx
index df8bb0f..76609e1 100644
--- a/Source/CPack/cmCPackGenerator.cxx
+++ b/Source/CPack/cmCPackGenerator.cxx
@@ -1074,11 +1074,11 @@ const char* cmCPackGenerator::GetInstallPath()
     return this->InstallPath.c_str();
   }
 #if defined(_WIN32) && !defined(__CYGWIN__)
-  const char* prgfiles = cmsys::SystemTools::GetEnv("ProgramFiles");
-  const char* sysDrive = cmsys::SystemTools::GetEnv("SystemDrive");
-  if (prgfiles) {
+  std::string prgfiles;
+  std::string sysDrive;
+  if (cmsys::SystemTools::GetEnv("ProgramFiles", prgfiles)) {
     this->InstallPath = prgfiles;
-  } else if (sysDrive) {
+  } else if (cmsys::SystemTools::GetEnv("SystemDrive", sysDrive)) {
     this->InstallPath = sysDrive;
     this->InstallPath += "/Program Files";
   } else {
diff --git a/Source/CTest/cmCTestCoverageHandler.cxx b/Source/CTest/cmCTestCoverageHandler.cxx
index 7102533..3f37f2a 100644
--- a/Source/CTest/cmCTestCoverageHandler.cxx
+++ b/Source/CTest/cmCTestCoverageHandler.cxx
@@ -727,10 +727,8 @@ int cmCTestCoverageHandler::HandleCoberturaCoverage(
   // if it doesn't exist or is empty, assume the
   // binary directory is used.
   std::string coverageXMLFile;
-  const char* covDir = cmSystemTools::GetEnv("COBERTURADIR");
-  if (covDir && strlen(covDir) != 0) {
-    coverageXMLFile = std::string(covDir);
-  } else {
+  if (!cmSystemTools::GetEnv("COBERTURADIR", coverageXMLFile) ||
+      coverageXMLFile.empty()) {
     coverageXMLFile = this->CTest->GetBinaryDir();
   }
   // build the find file string with the directory from above
@@ -791,7 +789,8 @@ struct cmCTestCoverageHandlerLocale
 {
   cmCTestCoverageHandlerLocale()
   {
-    if (const char* l = cmSystemTools::GetEnv("LC_ALL")) {
+    std::string l;
+    if (cmSystemTools::GetEnv("LC_ALL", l)) {
       lc_all = l;
     }
     if (lc_all != "C") {
@@ -2121,8 +2120,8 @@ int cmCTestCoverageHandler::RunBullseyeSourceSummary(
 int cmCTestCoverageHandler::HandleBullseyeCoverage(
   cmCTestCoverageHandlerContainer* cont)
 {
-  const char* covfile = cmSystemTools::GetEnv("COVFILE");
-  if (!covfile || strlen(covfile) == 0) {
+  std::string covfile;
+  if (!cmSystemTools::GetEnv("COVFILE", covfile) || covfile.empty()) {
     cmCTestOptionalLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
                        " COVFILE environment variable not found, not running "
                        " bullseye\n",
diff --git a/Source/CTest/cmCTestCurl.cxx b/Source/CTest/cmCTestCurl.cxx
index 6b8e5b5..b335e32 100644
--- a/Source/CTest/cmCTestCurl.cxx
+++ b/Source/CTest/cmCTestCurl.cxx
@@ -219,16 +219,18 @@ bool cmCTestCurl::HttpRequest(std::string const& url,
 
 void cmCTestCurl::SetProxyType()
 {
-  if (cmSystemTools::GetEnv("HTTP_PROXY")) {
-    this->HTTPProxy = cmSystemTools::GetEnv("HTTP_PROXY");
-    if (cmSystemTools::GetEnv("HTTP_PROXY_PORT")) {
+  this->HTTPProxy = "";
+  // this is the default
+  this->HTTPProxyType = CURLPROXY_HTTP;
+  this->HTTPProxyAuth = "";
+  if (cmSystemTools::GetEnv("HTTP_PROXY", this->HTTPProxy)) {
+    std::string port;
+    if (cmSystemTools::GetEnv("HTTP_PROXY_PORT", port)) {
       this->HTTPProxy += ":";
-      this->HTTPProxy += cmSystemTools::GetEnv("HTTP_PROXY_PORT");
+      this->HTTPProxy += port;
     }
-    if (cmSystemTools::GetEnv("HTTP_PROXY_TYPE")) {
-      // this is the default
-      this->HTTPProxyType = CURLPROXY_HTTP;
-      std::string type = cmSystemTools::GetEnv("HTTP_PROXY_TYPE");
+    std::string type;
+    if (cmSystemTools::GetEnv("HTTP_PROXY_TYPE", type)) {
       // HTTP/SOCKS4/SOCKS5
       if (type == "HTTP") {
         this->HTTPProxyType = CURLPROXY_HTTP;
@@ -238,12 +240,11 @@ void cmCTestCurl::SetProxyType()
         this->HTTPProxyType = CURLPROXY_SOCKS5;
       }
     }
-    if (cmSystemTools::GetEnv("HTTP_PROXY_USER")) {
-      this->HTTPProxyAuth = cmSystemTools::GetEnv("HTTP_PROXY_USER");
-    }
-    if (cmSystemTools::GetEnv("HTTP_PROXY_PASSWD")) {
+    cmSystemTools::GetEnv("HTTP_PROXY_USER", this->HTTPProxyAuth);
+    std::string passwd;
+    if (cmSystemTools::GetEnv("HTTP_PROXY_PASSWD", passwd)) {
       this->HTTPProxyAuth += ":";
-      this->HTTPProxyAuth += cmSystemTools::GetEnv("HTTP_PROXY_PASSWD");
+      this->HTTPProxyAuth += passwd;
     }
   }
 }
diff --git a/Source/CTest/cmCTestMultiProcessHandler.cxx b/Source/CTest/cmCTestMultiProcessHandler.cxx
index ae97d32..a4e0b95 100644
--- a/Source/CTest/cmCTestMultiProcessHandler.cxx
+++ b/Source/CTest/cmCTestMultiProcessHandler.cxx
@@ -261,12 +261,14 @@ void cmCTestMultiProcessHandler::StartNextTests()
     allTestsFailedTestLoadCheck = true;
 
     // Check for a fake load average value used in testing.
-    if (const char* fake_load_value =
-          cmSystemTools::GetEnv("__CTEST_FAKE_LOAD_AVERAGE_FOR_TESTING")) {
+    std::string fake_load_value;
+    if (cmSystemTools::GetEnv("__CTEST_FAKE_LOAD_AVERAGE_FOR_TESTING",
+                              fake_load_value)) {
       usedFakeLoadForTesting = true;
-      if (!cmSystemTools::StringToULong(fake_load_value, &systemLoad)) {
+      if (!cmSystemTools::StringToULong(fake_load_value.c_str(),
+                                        &systemLoad)) {
         cmSystemTools::Error("Failed to parse fake load value: ",
-                             fake_load_value);
+                             fake_load_value.c_str());
       }
     }
     // If it's not set, look up the true load average.
diff --git a/Source/cmBuildCommand.cxx b/Source/cmBuildCommand.cxx
index fb143a2..9830867 100644
--- a/Source/cmBuildCommand.cxx
+++ b/Source/cmBuildCommand.cxx
@@ -36,8 +36,8 @@ bool cmBuildCommand::MainSignature(std::vector<std::string> const& args)
   const char* variable = args[0].c_str();
 
   // Parse remaining arguments.
-  const char* configuration = CM_NULLPTR;
-  const char* project_name = CM_NULLPTR;
+  std::string configuration;
+  std::string project_name;
   std::string target;
   enum Doing
   {
@@ -56,10 +56,10 @@ bool cmBuildCommand::MainSignature(std::vector<std::string> const& args)
       doing = DoingTarget;
     } else if (doing == DoingConfiguration) {
       doing = DoingNone;
-      configuration = args[i].c_str();
+      configuration = args[i];
     } else if (doing == DoingProjectName) {
       doing = DoingNone;
-      project_name = args[i].c_str();
+      project_name = args[i];
     } else if (doing == DoingTarget) {
       doing = DoingNone;
       target = args[i];
@@ -76,14 +76,14 @@ bool cmBuildCommand::MainSignature(std::vector<std::string> const& args)
   // so we put this code here to end up with the same default configuration
   // as the original 2-arg build_command signature:
   //
-  if (!configuration || !*configuration) {
-    configuration = getenv("CMAKE_CONFIG_TYPE");
+  if (configuration.empty()) {
+    cmSystemTools::GetEnv("CMAKE_CONFIG_TYPE", configuration);
   }
-  if (!configuration || !*configuration) {
+  if (configuration.empty()) {
     configuration = "Release";
   }
 
-  if (project_name && *project_name) {
+  if (!project_name.empty()) {
     this->Makefile->IssueMessage(
       cmake::AUTHOR_WARNING,
       "Ignoring PROJECT_NAME option because it has no effect.");
@@ -91,7 +91,8 @@ bool cmBuildCommand::MainSignature(std::vector<std::string> const& args)
 
   std::string makecommand =
     this->Makefile->GetGlobalGenerator()->GenerateCMakeBuildCommand(
-      target, configuration, "", this->Makefile->IgnoreErrorsCMP0061());
+      target, configuration.c_str(), "",
+      this->Makefile->IgnoreErrorsCMP0061());
 
   this->Makefile->AddDefinition(variable, makecommand.c_str());
 
@@ -108,10 +109,10 @@ bool cmBuildCommand::TwoArgsSignature(std::vector<std::string> const& args)
   const char* define = args[0].c_str();
   const char* cacheValue = this->Makefile->GetDefinition(define);
 
-  std::string configType = "Release";
-  const char* cfg = getenv("CMAKE_CONFIG_TYPE");
-  if (cfg && *cfg) {
-    configType = cfg;
+  std::string configType;
+  if (!cmSystemTools::GetEnv("CMAKE_CONFIG_TYPE", configType) ||
+      configType.empty()) {
+    configType = "Release";
   }
 
   std::string makecommand =
diff --git a/Source/cmCLocaleEnvironmentScope.cxx b/Source/cmCLocaleEnvironmentScope.cxx
index a19dbae..e4c74ec 100644
--- a/Source/cmCLocaleEnvironmentScope.cxx
+++ b/Source/cmCLocaleEnvironmentScope.cxx
@@ -31,8 +31,9 @@ cmCLocaleEnvironmentScope::cmCLocaleEnvironmentScope()
 
 std::string cmCLocaleEnvironmentScope::GetEnv(std::string const& key)
 {
-  const char* value = cmSystemTools::GetEnv(key);
-  return value ? value : std::string();
+  std::string value;
+  cmSystemTools::GetEnv(key, value);
+  return value;
 }
 
 void cmCLocaleEnvironmentScope::SetEnv(std::string const& key,
diff --git a/Source/cmCTest.cxx b/Source/cmCTest.cxx
index 3bb997a..0101049 100644
--- a/Source/cmCTest.cxx
+++ b/Source/cmCTest.cxx
@@ -298,9 +298,10 @@ cmCTest::cmCTest()
   this->ComputedCompressMemCheckOutput = false;
   this->RepeatTests = 1; // default to run each test once
   this->RepeatUntilFail = false;
-  if (const char* outOnFail =
-        cmSystemTools::GetEnv("CTEST_OUTPUT_ON_FAILURE")) {
-    this->OutputTestOutputOnTestFailure = !cmSystemTools::IsOff(outOnFail);
+  std::string outOnFail;
+  if (cmSystemTools::GetEnv("CTEST_OUTPUT_ON_FAILURE", outOnFail)) {
+    this->OutputTestOutputOnTestFailure =
+      !cmSystemTools::IsOff(outOnFail.c_str());
   }
   this->InitStreams();
 
@@ -2091,8 +2092,9 @@ int cmCTest::Run(std::vector<std::string>& args, std::string* output)
 
   // handle CTEST_PARALLEL_LEVEL environment variable
   if (!this->ParallelLevelSetInCli) {
-    if (const char* parallel = cmSystemTools::GetEnv("CTEST_PARALLEL_LEVEL")) {
-      int plevel = atoi(parallel);
+    std::string parallel;
+    if (cmSystemTools::GetEnv("CTEST_PARALLEL_LEVEL", parallel)) {
+      int plevel = atoi(parallel.c_str());
       this->SetParallelLevel(plevel);
     }
   }
diff --git a/Source/cmCommandArgumentParserHelper.cxx b/Source/cmCommandArgumentParserHelper.cxx
index 294117c..42fb105 100644
--- a/Source/cmCommandArgumentParserHelper.cxx
+++ b/Source/cmCommandArgumentParserHelper.cxx
@@ -71,12 +71,12 @@ char* cmCommandArgumentParserHelper::ExpandSpecialVariable(const char* key,
     return this->EmptyVariable;
   }
   if (strcmp(key, "ENV") == 0) {
-    char* ptr = getenv(var);
-    if (ptr) {
+    std::string str;
+    if (cmSystemTools::GetEnv(var, str)) {
       if (this->EscapeQuotes) {
-        return this->AddString(cmSystemTools::EscapeQuotes(ptr));
+        return this->AddString(cmSystemTools::EscapeQuotes(str.c_str()));
       } else {
-        return ptr;
+        return this->AddString(str);
       }
     }
     return this->EmptyVariable;
diff --git a/Source/cmConditionEvaluator.cxx b/Source/cmConditionEvaluator.cxx
index 67b2571..e02221c 100644
--- a/Source/cmConditionEvaluator.cxx
+++ b/Source/cmConditionEvaluator.cxx
@@ -486,7 +486,7 @@ bool cmConditionEvaluator::HandleLevel1(cmArgumentList& newArgs, std::string&,
         if (argP1len > 4 && argP1->GetValue().substr(0, 4) == "ENV{" &&
             argP1->GetValue().operator[](argP1len - 1) == '}') {
           std::string env = argP1->GetValue().substr(4, argP1len - 5);
-          bdef = cmSystemTools::GetEnv(env.c_str()) ? true : false;
+          bdef = cmSystemTools::HasEnv(env.c_str());
         } else {
           bdef = this->Makefile.IsDefinitionSet(argP1->GetValue());
         }
diff --git a/Source/cmExportCommand.cxx b/Source/cmExportCommand.cxx
index 3cb575e..fc62492 100644
--- a/Source/cmExportCommand.cxx
+++ b/Source/cmExportCommand.cxx
@@ -327,11 +327,10 @@ void cmExportCommand::StorePackageRegistryDir(std::string const& package,
   fname += "/cmake/packages/";
   fname += package;
 #else
-  const char* home = cmSystemTools::GetEnv("HOME");
-  if (!home) {
+  std::string fname;
+  if (!cmSystemTools::GetEnv("HOME", fname)) {
     return;
   }
-  std::string fname = home;
   cmSystemTools::ConvertToUnixSlashes(fname);
   fname += "/.cmake/packages/";
   fname += package;
diff --git a/Source/cmExtraEclipseCDT4Generator.cxx b/Source/cmExtraEclipseCDT4Generator.cxx
index 16cb082..93c55cc 100644
--- a/Source/cmExtraEclipseCDT4Generator.cxx
+++ b/Source/cmExtraEclipseCDT4Generator.cxx
@@ -208,7 +208,8 @@ void cmExtraEclipseCDT4Generator::AddEnvVar(std::ostream& out,
   // get the variables from the environment and from the cache and then
   // figure out which one to use:
 
-  const char* envVarValue = getenv(envVar);
+  std::string envVarValue;
+  const bool envVarSet = cmSystemTools::GetEnv(envVar, envVarValue);
 
   std::string cacheEntryName = "CMAKE_ECLIPSE_ENVVAR_";
   cacheEntryName += envVar;
@@ -217,17 +218,17 @@ void cmExtraEclipseCDT4Generator::AddEnvVar(std::ostream& out,
 
   // now we have both, decide which one to use
   std::string valueToUse;
-  if (envVarValue == CM_NULLPTR && cacheValue == CM_NULLPTR) {
+  if (!envVarSet && cacheValue == CM_NULLPTR) {
     // nothing known, do nothing
     valueToUse = "";
-  } else if (envVarValue != CM_NULLPTR && cacheValue == CM_NULLPTR) {
+  } else if (envVarSet && cacheValue == CM_NULLPTR) {
     // The variable is in the env, but not in the cache. Use it and put it
     // in the cache
     valueToUse = envVarValue;
     mf->AddCacheDefinition(cacheEntryName, valueToUse.c_str(),
                            cacheEntryName.c_str(), cmState::STRING, true);
     mf->GetCMakeInstance()->SaveCache(lg->GetBinaryDirectory());
-  } else if (envVarValue == CM_NULLPTR && cacheValue != CM_NULLPTR) {
+  } else if (!envVarSet && cacheValue != CM_NULLPTR) {
     // It is already in the cache, but not in the env, so use it from the cache
     valueToUse = cacheValue;
   } else {
diff --git a/Source/cmFileCommand.cxx b/Source/cmFileCommand.cxx
index 5a1238b..835b118 100644
--- a/Source/cmFileCommand.cxx
+++ b/Source/cmFileCommand.cxx
@@ -1609,8 +1609,10 @@ struct cmFileInstaller : public cmFileCopier
     // Installation does not use source permissions by default.
     this->UseSourcePermissions = false;
     // Check whether to copy files always or only if they have changed.
-    this->Always =
-      cmSystemTools::IsOn(cmSystemTools::GetEnv("CMAKE_INSTALL_ALWAYS"));
+    std::string install_always;
+    if (cmSystemTools::GetEnv("CMAKE_INSTALL_ALWAYS", install_always)) {
+      this->Always = cmSystemTools::IsOn(install_always.c_str());
+    }
     // Get the current manifest.
     this->Manifest =
       this->Makefile->GetSafeDefinition("CMAKE_INSTALL_MANIFEST_FILES");
@@ -1869,9 +1871,8 @@ bool cmFileInstaller::HandleInstallDestination()
     return false;
   }
 
-  const char* destdir = cmSystemTools::GetEnv("DESTDIR");
-  if (destdir && *destdir) {
-    std::string sdestdir = destdir;
+  std::string sdestdir;
+  if (cmSystemTools::GetEnv("DESTDIR", sdestdir) && !sdestdir.empty()) {
     cmSystemTools::ConvertToUnixSlashes(sdestdir);
     char ch1 = destination[0];
     char ch2 = destination[1];
diff --git a/Source/cmFindPackageCommand.cxx b/Source/cmFindPackageCommand.cxx
index d5fd75d..260079b 100644
--- a/Source/cmFindPackageCommand.cxx
+++ b/Source/cmFindPackageCommand.cxx
@@ -1077,8 +1077,8 @@ void cmFindPackageCommand::FillPrefixesUserRegistry()
                                  this->LabeledPaths[PathLabel::UserRegistry]);
   }
 #else
-  if (const char* home = cmSystemTools::GetEnv("HOME")) {
-    std::string dir = home;
+  std::string dir;
+  if (cmSystemTools::GetEnv("HOME", dir)) {
     dir += "/.cmake/packages/";
     dir += this->Name;
     this->LoadPackageRegistryDir(dir,
diff --git a/Source/cmGlobalVisualStudio7Generator.cxx b/Source/cmGlobalVisualStudio7Generator.cxx
index 262909f..0a83b3a 100644
--- a/Source/cmGlobalVisualStudio7Generator.cxx
+++ b/Source/cmGlobalVisualStudio7Generator.cxx
@@ -122,9 +122,9 @@ void cmGlobalVisualStudio7Generator::EnableLanguage(
   // does not use the environment it is run in, and this allows
   // for running commands and using dll's that the IDE environment
   // does not know about.
-  const char* extraPath = cmSystemTools::GetEnv("CMAKE_MSVCIDE_RUN_PATH");
-  if (extraPath) {
-    mf->AddCacheDefinition("CMAKE_MSVCIDE_RUN_PATH", extraPath,
+  std::string extraPath;
+  if (cmSystemTools::GetEnv("CMAKE_MSVCIDE_RUN_PATH", extraPath)) {
+    mf->AddCacheDefinition("CMAKE_MSVCIDE_RUN_PATH", extraPath.c_str(),
                            "Saved environment variable CMAKE_MSVCIDE_RUN_PATH",
                            cmState::STATIC);
   }
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 0d550dd..ab7de57 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -2572,6 +2572,7 @@ cmake::MessageType cmMakefile::ExpandVariablesInStringNew(
           std::string const& lookup = result.substr(var.loc);
           const char* value = CM_NULLPTR;
           std::string varresult;
+          std::string svalue;
           static const std::string lineVar = "CMAKE_CURRENT_LIST_LINE";
           switch (var.domain) {
             case NORMAL:
@@ -2584,7 +2585,9 @@ cmake::MessageType cmMakefile::ExpandVariablesInStringNew(
               }
               break;
             case ENVIRONMENT:
-              value = cmSystemTools::GetEnv(lookup.c_str());
+              if (cmSystemTools::GetEnv(lookup, svalue)) {
+                value = svalue.c_str();
+              }
               break;
             case CACHE:
               value = state->GetCacheEntryValue(lookup);
diff --git a/Source/cmNinjaTargetGenerator.cxx b/Source/cmNinjaTargetGenerator.cxx
index 1d3e608..855a243 100644
--- a/Source/cmNinjaTargetGenerator.cxx
+++ b/Source/cmNinjaTargetGenerator.cxx
@@ -741,5 +741,5 @@ bool cmNinjaTargetGenerator::ForceResponseFile()
 {
   static std::string const forceRspFile = "CMAKE_NINJA_FORCE_RESPONSE_FILE";
   return (this->GetMakefile()->IsDefinitionSet(forceRspFile) ||
-          cmSystemTools::GetEnv(forceRspFile) != CM_NULLPTR);
+          cmSystemTools::HasEnv(forceRspFile));
 }
diff --git a/Source/cmQtAutoGenerators.cxx b/Source/cmQtAutoGenerators.cxx
index 4b40c08..b821fda 100644
--- a/Source/cmQtAutoGenerators.cxx
+++ b/Source/cmQtAutoGenerators.cxx
@@ -88,7 +88,7 @@ static std::string extractSubDir(const std::string& absPath,
 }
 
 cmQtAutoGenerators::cmQtAutoGenerators()
-  : Verbose(cmsys::SystemTools::GetEnv("VERBOSE") != CM_NULLPTR)
+  : Verbose(cmsys::SystemTools::HasEnv("VERBOSE"))
   , ColorOutput(true)
   , RunMocFailed(false)
   , RunUicFailed(false)
diff --git a/Source/cmSetCommand.cxx b/Source/cmSetCommand.cxx
index 1484368..8fb6aa0 100644
--- a/Source/cmSetCommand.cxx
+++ b/Source/cmSetCommand.cxx
@@ -31,13 +31,14 @@ bool cmSetCommand::InitialPass(std::vector<std::string> const& args,
     putEnvArg += "=";
 
     // what is the current value if any
-    const char* currValue = getenv(varName);
+    std::string currValue;
+    const bool currValueSet = cmSystemTools::GetEnv(varName, currValue);
     delete[] varName;
 
     // will it be set to something, then set it
     if (args.size() > 1 && !args[1].empty()) {
       // but only if it is different from current value
-      if (!currValue || strcmp(currValue, args[1].c_str())) {
+      if (!currValueSet || currValue != args[1]) {
         putEnvArg += args[1];
         cmSystemTools::PutEnv(putEnvArg);
       }
@@ -45,7 +46,7 @@ bool cmSetCommand::InitialPass(std::vector<std::string> const& args,
     }
 
     // if it will be cleared, then clear it if it isn't already clear
-    if (currValue) {
+    if (currValueSet) {
       cmSystemTools::PutEnv(putEnvArg);
     }
     return true;
diff --git a/Source/cmState.cxx b/Source/cmState.cxx
index f2fe134..0470508 100644
--- a/Source/cmState.cxx
+++ b/Source/cmState.cxx
@@ -1286,8 +1286,9 @@ void cmState::Snapshot::SetDefaultDefinitions()
   this->SetDefinition("CMAKE_HOST_UNIX", "1");
 #endif
 #if defined(__CYGWIN__)
-  if (cmSystemTools::IsOn(
-        cmSystemTools::GetEnv("CMAKE_LEGACY_CYGWIN_WIN32"))) {
+  std::string legacy;
+  if (cmSystemTools::GetEnv("CMAKE_LEGACY_CYGWIN_WIN32", legacy) &&
+      cmSystemTools::IsOn(legacy.c_str())) {
     this->SetDefinition("WIN32", "1");
     this->SetDefinition("CMAKE_HOST_WIN32", "1");
   }
diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 2d463f3..9740ef7 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -2069,9 +2069,9 @@ void cmSystemTools::MakefileColorEcho(int color, const char* message,
   // However, we can test for some situations when the answer is most
   // likely no.
   int assumeTTY = cmsysTerminal_Color_AssumeTTY;
-  if (cmSystemTools::GetEnv("DART_TEST_FROM_DART") ||
-      cmSystemTools::GetEnv("DASHBOARD_TEST_FROM_CTEST") ||
-      cmSystemTools::GetEnv("CTEST_INTERACTIVE_DEBUG_MODE")) {
+  if (cmSystemTools::HasEnv("DART_TEST_FROM_DART") ||
+      cmSystemTools::HasEnv("DASHBOARD_TEST_FROM_CTEST") ||
+      cmSystemTools::HasEnv("CTEST_INTERACTIVE_DEBUG_MODE")) {
     // Avoid printing color escapes during dashboard builds.
     assumeTTY = 0;
   }
diff --git a/Source/cmTimestamp.cxx b/Source/cmTimestamp.cxx
index c3c1d17..61b74db 100644
--- a/Source/cmTimestamp.cxx
+++ b/Source/cmTimestamp.cxx
@@ -93,10 +93,9 @@ time_t cmTimestamp::CreateUtcTimeTFromTm(struct tm& tm) const
 #else
   // From Linux timegm() manpage.
 
-  std::string tz_old = "TZ=";
-  if (const char* tz = cmSystemTools::GetEnv("TZ")) {
-    tz_old += tz;
-  }
+  std::string tz_old = "";
+  cmSystemTools::GetEnv("TZ", tz_old);
+  tz_old = "TZ=" + tz_old;
 
   // The standard says that "TZ=" or "TZ=[UNRECOGNIZED_TZ]" means UTC.
   // It seems that "TZ=" does NOT work, at least under Windows
diff --git a/Source/cmUtils.hxx b/Source/cmUtils.hxx
new file mode 100644
index 0000000..b7a79cc
--- /dev/null
+++ b/Source/cmUtils.hxx
@@ -0,0 +1,26 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2016 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.
+============================================================================*/
+#ifndef cmUtils_hxx
+#define cmUtils_hxx
+
+#include <cmsys/SystemTools.hxx>
+
+// Use the make system's VERBOSE environment variable to enable
+// verbose output. This can be skipped by also setting CMAKE_NO_VERBOSE
+// (which is set by the Eclipse and KDevelop generators).
+inline bool isCMakeVerbose()
+{
+  return (cmSystemTools::HasEnv("VERBOSE") &&
+          !cmSystemTools::HasEnv("CMAKE_NO_VERBOSE"));
+}
+
+#endif
diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index fceec16..cdc1284 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -22,6 +22,7 @@
 #include "cmSourceFile.h"
 #include "cmState.h"
 #include "cmTest.h"
+#include "cmUtils.hxx"
 
 #if defined(CMAKE_BUILD_WITH_CMAKE)
 #include "cmGraphVizWriter.h"
@@ -957,16 +958,10 @@ void cmake::SetGlobalGenerator(cmGlobalGenerator* gg)
   cmSystemTools::SetForceUnixPaths(this->GlobalGenerator->GetForceUnixPaths());
 
   // Save the environment variables CXX and CC
-  const char* cxx = getenv("CXX");
-  const char* cc = getenv("CC");
-  if (cxx) {
-    this->CXXEnvironment = cxx;
-  } else {
+  if (!cmSystemTools::GetEnv("CXX", this->CXXEnvironment)) {
     this->CXXEnvironment = "";
   }
-  if (cc) {
-    this->CCEnvironment = cc;
-  } else {
+  if (!cmSystemTools::GetEnv("CC", this->CCEnvironment)) {
     this->CCEnvironment = "";
   }
 }
@@ -1431,7 +1426,7 @@ int cmake::Run(const std::vector<std::string>& args, bool noconfigure)
   // should fail (if "-i" is an option).  We cannot simply test
   // whether "-i" is given and remove it because some make programs
   // encode the MAKEFLAGS variable in a strange way.
-  if (getenv("MAKEFLAGS")) {
+  if (cmSystemTools::HasEnv("MAKEFLAGS")) {
     cmSystemTools::PutEnv("MAKEFLAGS=");
   }
 
@@ -1706,12 +1701,8 @@ void cmake::UpdateConversionPathTable()
 
 int cmake::CheckBuildSystem()
 {
-  // We do not need to rerun CMake.  Check dependency integrity.  Use
-  // the make system's VERBOSE environment variable to enable verbose
-  // output. This can be skipped by setting CMAKE_NO_VERBOSE (which is set
-  // by the Eclipse and KDevelop generators).
-  bool verbose = ((cmSystemTools::GetEnv("VERBOSE") != CM_NULLPTR) &&
-                  (cmSystemTools::GetEnv("CMAKE_NO_VERBOSE") == CM_NULLPTR));
+  // We do not need to rerun CMake.  Check dependency integrity.
+  const bool verbose = isCMakeVerbose();
 
   // This method will check the integrity of the build system if the
   // option was given on the command line.  It reads the given file to
diff --git a/Source/cmcmd.cxx b/Source/cmcmd.cxx
index feb330c..9d0337a 100644
--- a/Source/cmcmd.cxx
+++ b/Source/cmcmd.cxx
@@ -16,6 +16,7 @@
 #include "cmLocalGenerator.h"
 #include "cmMakefile.h"
 #include "cmQtAutoGenerators.h"
+#include "cmUtils.hxx"
 #include "cmVersion.h"
 
 #if defined(CMAKE_BUILD_WITH_CMAKE)
@@ -673,12 +674,7 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string>& args)
 
     // Internal CMake dependency scanning support.
     else if (args[1] == "cmake_depends" && args.size() >= 6) {
-      // Use the make system's VERBOSE environment variable to enable
-      // verbose output. This can be skipped by also setting CMAKE_NO_VERBOSE
-      // (which is set by the Eclipse and KDevelop generators).
-      bool verbose =
-        ((cmSystemTools::GetEnv("VERBOSE") != CM_NULLPTR) &&
-         (cmSystemTools::GetEnv("CMAKE_NO_VERBOSE") == CM_NULLPTR));
+      const bool verbose = isCMakeVerbose();
 
       // Create a cmake object instance to process dependencies.
       cmake cm;
@@ -876,9 +872,9 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string>& args)
         // 1/10th of a second after the untar.  If CMAKE_UNTAR_DELAY
         // is set in the env, its value will be used instead of 100.
         int delay = 100;
-        const char* delayVar = cmSystemTools::GetEnv("CMAKE_UNTAR_DELAY");
-        if (delayVar) {
-          delay = atoi(delayVar);
+        std::string delayVar;
+        if (cmSystemTools::GetEnv("CMAKE_UNTAR_DELAY", delayVar)) {
+          delay = atoi(delayVar.c_str());
         }
         if (delay) {
           cmSystemTools::Delay(delay);
@@ -1230,7 +1226,7 @@ int cmcmd::VisualStudioLink(std::vector<std::string>& args, int type)
   if (args.size() < 2) {
     return -1;
   }
-  bool verbose = cmSystemTools::GetEnv("VERBOSE") != CM_NULLPTR;
+  const bool verbose = cmSystemTools::HasEnv("VERBOSE");
   std::vector<std::string> expandedArgs;
   for (std::vector<std::string>::iterator i = args.begin(); i != args.end();
        ++i) {