Made Pref::k_, OptionHandler::getName() and getDescription() const char*.

12 files changed, 85 insertions, 80 deletions

diff --git a/src/AbstractOptionHandler.cc b/src/AbstractOptionHandler.cc
index 412a6520..f06c9ea3 100644
--- a/src/AbstractOptionHandler.cc
+++ b/src/AbstractOptionHandler.cc
@@ -45,7 +45,7 @@ namespace aria2 {
 
 AbstractOptionHandler::AbstractOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  ARG_TYPE argType,
  char shortName)
@@ -89,7 +89,7 @@ std::string AbstractOptionHandler::toTagString() const
   return strjoin(tags_.begin(), tags_.end(), ", ");
 }
 
-const std::string& AbstractOptionHandler::getName() const
+const char* AbstractOptionHandler::getName() const
 {
   return pref_->k;
 }
diff --git a/src/AbstractOptionHandler.h b/src/AbstractOptionHandler.h
index f533bd66..b13c2b2f 100644
--- a/src/AbstractOptionHandler.h
+++ b/src/AbstractOptionHandler.h
@@ -50,7 +50,7 @@ class AbstractOptionHandler : public OptionHandler {
 protected:
   const Pref* pref_;
 
-  std::string description_;
+  const char* description_;
 
   std::string defaultValue_;
 
@@ -73,7 +73,7 @@ protected:
   virtual void parseArg(Option& option, const std::string& arg) = 0;
 public:
   AbstractOptionHandler(const Pref* pref,
-                         const std::string& description = NO_DESCRIPTION,
+                         const char* description = NO_DESCRIPTION,
                          const std::string& defaultValue = NO_DEFAULT_VALUE,
                          ARG_TYPE argType = REQ_ARG,
                          char shortName = 0);
@@ -88,9 +88,9 @@ public:
 
   virtual std::string toTagString() const;
 
-  virtual const std::string& getName() const;
+  virtual const char* getName() const;
 
-  virtual const std::string& getDescription() const
+  virtual const char* getDescription() const
   {
     return description_;
   }
diff --git a/src/OptionHandler.cc b/src/OptionHandler.cc
index 1d0fda4d..7ec941f9 100644
--- a/src/OptionHandler.cc
+++ b/src/OptionHandler.cc
@@ -41,7 +41,7 @@
 
 namespace aria2 {
 
-const std::string NO_DESCRIPTION("");
+const char NO_DESCRIPTION[] = "";
 const std::string NO_DEFAULT_VALUE("");
 
 const std::string PATH_TO_FILE("/path/to/file");
diff --git a/src/OptionHandler.h b/src/OptionHandler.h
index 10be6737..1fc83af3 100644
--- a/src/OptionHandler.h
+++ b/src/OptionHandler.h
@@ -46,7 +46,7 @@
 
 namespace aria2 {
 
-extern const std::string NO_DESCRIPTION;
+extern const char NO_DESCRIPTION[];
 extern const std::string NO_DEFAULT_VALUE;
 
 extern const std::string PATH_TO_FILE;
@@ -72,9 +72,9 @@ public:
 
   virtual std::string toTagString() const = 0;
 
-  virtual const std::string& getName() const = 0;
+  virtual const char* getName() const = 0;
 
-  virtual const std::string& getDescription() const = 0;
+  virtual const char* getDescription() const = 0;
 
   virtual const std::string& getDefaultValue() const = 0;
 
diff --git a/src/OptionHandlerException.cc b/src/OptionHandlerException.cc
index c8938cf7..59cb7667 100644
--- a/src/OptionHandlerException.cc
+++ b/src/OptionHandlerException.cc
@@ -45,7 +45,7 @@ OptionHandlerException::OptionHandlerException
 (const char* file, int line,
  const Pref* pref)
   : RecoverableException
-    (file, line, fmt(MESSAGE.c_str(), pref->k.c_str()),
+    (file, line, fmt(MESSAGE.c_str(), pref->k),
      error_code::OPTION_ERROR),
     pref_(pref)
 {}
@@ -55,7 +55,7 @@ OptionHandlerException::OptionHandlerException
  const Pref* pref,
  const Exception& cause)
   : RecoverableException
-    (file, line, fmt(MESSAGE.c_str(), pref->k.c_str()),
+    (file, line, fmt(MESSAGE.c_str(), pref->k),
      error_code::OPTION_ERROR,
      cause),
     pref_(pref)
diff --git a/src/OptionHandlerImpl.cc b/src/OptionHandlerImpl.cc
index e739201e..b7e2a68f 100644
--- a/src/OptionHandlerImpl.cc
+++ b/src/OptionHandlerImpl.cc
@@ -36,6 +36,7 @@
 
 #include <cassert>
 #include <cstdio>
+#include <cstring>
 #include <utility>
 #include <algorithm>
 #include <numeric>
@@ -67,7 +68,7 @@ namespace aria2 {
 
 BooleanOptionHandler::BooleanOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  OptionHandler::ARG_TYPE argType,
  char shortName)
@@ -100,7 +101,7 @@ std::string BooleanOptionHandler::createPossibleValuesString() const
 
 IntegerRangeOptionHandler::IntegerRangeOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  int32_t min, int32_t max,
  char shortName)
@@ -138,7 +139,7 @@ std::string IntegerRangeOptionHandler::createPossibleValuesString() const
 
 NumberOptionHandler::NumberOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  int64_t min,
  int64_t max,
@@ -200,7 +201,7 @@ std::string NumberOptionHandler::createPossibleValuesString() const
 
 UnitNumberOptionHandler::UnitNumberOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  int64_t min,
  int64_t max,
@@ -220,7 +221,7 @@ void UnitNumberOptionHandler::parseArg
 
 FloatNumberOptionHandler::FloatNumberOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  double min,
  double max,
@@ -278,7 +279,7 @@ std::string FloatNumberOptionHandler::createPossibleValuesString() const
 
 DefaultOptionHandler::DefaultOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  const std::string& possibleValuesString,
  OptionHandler::ARG_TYPE argType,
@@ -302,7 +303,7 @@ std::string DefaultOptionHandler::createPossibleValuesString() const
 
 CumulativeOptionHandler::CumulativeOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  const std::string& delim,
  const std::string& possibleValuesString,
@@ -331,7 +332,7 @@ std::string CumulativeOptionHandler::createPossibleValuesString() const
 
 IndexOutOptionHandler::IndexOutOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  char shortName)
   : AbstractOptionHandler(pref, description, NO_DEFAULT_VALUE,
                           OptionHandler::REQ_ARG, shortName)
@@ -356,7 +357,7 @@ std::string IndexOutOptionHandler::createPossibleValuesString() const
 #ifdef ENABLE_MESSAGE_DIGEST
 ChecksumOptionHandler::ChecksumOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  char shortName)
   : AbstractOptionHandler(pref, description, NO_DEFAULT_VALUE,
                           OptionHandler::REQ_ARG, shortName)
@@ -386,7 +387,7 @@ std::string ChecksumOptionHandler::createPossibleValuesString() const
 
 ParameterOptionHandler::ParameterOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  const std::vector<std::string>& validParamValues,
  char shortName)
@@ -397,7 +398,7 @@ ParameterOptionHandler::ParameterOptionHandler
 
 ParameterOptionHandler::ParameterOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  const std::string& validParamValue,
  char shortName)
@@ -409,7 +410,7 @@ ParameterOptionHandler::ParameterOptionHandler
 
 ParameterOptionHandler::ParameterOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  const std::string& validParamValue1,
  const std::string& validParamValue2,
@@ -423,7 +424,7 @@ ParameterOptionHandler::ParameterOptionHandler
 
 ParameterOptionHandler::ParameterOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  const std::string& validParamValue1,
  const std::string& validParamValue2,
@@ -471,7 +472,7 @@ std::string ParameterOptionHandler::createPossibleValuesString() const
 
 HostPortOptionHandler::HostPortOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  const Pref* hostOptionName,
  const Pref* portOptionName,
@@ -510,7 +511,7 @@ std::string HostPortOptionHandler::createPossibleValuesString() const
 
 HttpProxyUserOptionHandler::HttpProxyUserOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  char shortName)
   : AbstractOptionHandler(pref, description, defaultValue,
@@ -521,9 +522,9 @@ void HttpProxyUserOptionHandler::parseArg
 (Option& option, const std::string& optarg)
 {
   const char A2_USER[] = "-user";
-  if(util::endsWith(pref_->k.begin(), pref_->k.end(),
-                    A2_USER, vend(A2_USER)-1)) {
-    const Pref* proxyPref = option::k2p(pref_->k.substr(0, pref_->k.size()-5));
+  size_t kLen = strlen(pref_->k);
+  if(util::endsWith(pref_->k, pref_->k+kLen, A2_USER, vend(A2_USER)-1)) {
+    const Pref* proxyPref = option::k2p(std::string(pref_->k, kLen-5));
     const std::string& olduri = option.get(proxyPref);
     if(!olduri.empty()) {
       Request req;
@@ -554,7 +555,7 @@ std::string HttpProxyUserOptionHandler::createPossibleValuesString() const
 
 HttpProxyPasswdOptionHandler::HttpProxyPasswdOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  char shortName)
   : AbstractOptionHandler(pref, description, defaultValue,
@@ -565,9 +566,9 @@ void HttpProxyPasswdOptionHandler::parseArg
 (Option& option, const std::string& optarg)
 {
   const char A2_PASSWD[] = "-passwd";
-  if(util::endsWith(pref_->k.begin(), pref_->k.end(),
-                    A2_PASSWD, vend(A2_PASSWD)-1)) {
-    const Pref* proxyPref = option::k2p(pref_->k.substr(0, pref_->k.size()-7));
+  size_t kLen = strlen(pref_->k);
+  if(util::endsWith(pref_->k, pref_->k+kLen, A2_PASSWD, vend(A2_PASSWD)-1)) {
+    const Pref* proxyPref = option::k2p(std::string(pref_->k, kLen-7));
     const std::string& olduri = option.get(proxyPref);
     if(!olduri.empty()) {
       Request req;
@@ -598,13 +599,13 @@ std::string HttpProxyPasswdOptionHandler::createPossibleValuesString() const
 
 HttpProxyOptionHandler::HttpProxyOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  char shortName)
   : AbstractOptionHandler(pref, description, defaultValue,
                           OptionHandler::REQ_ARG, shortName),
-    proxyUserPref_(option::k2p(pref->k+"-user")),
-    proxyPasswdPref_(option::k2p(pref->k+"-passwd"))
+    proxyUserPref_(option::k2p(std::string(pref->k)+"-user")),
+    proxyPasswdPref_(option::k2p(std::string(pref->k)+"-passwd"))
 {}
 
 HttpProxyOptionHandler::~HttpProxyOptionHandler() {}
@@ -657,7 +658,7 @@ std::string HttpProxyOptionHandler::createPossibleValuesString() const
 
 LocalFilePathOptionHandler::LocalFilePathOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  bool acceptStdin,
  char shortName)
@@ -691,7 +692,7 @@ std::string LocalFilePathOptionHandler::createPossibleValuesString() const
 
 PrioritizePieceOptionHandler::PrioritizePieceOptionHandler
 (const Pref* pref,
- const std::string& description,
+ const char* description,
  const std::string& defaultValue,
  char shortName)
   : AbstractOptionHandler(pref, description, defaultValue,
@@ -724,12 +725,12 @@ void DeprecatedOptionHandler::parse(Option& option, const std::string& arg)
 {
   if(repOptHandler_) {
     A2_LOG_WARN(fmt(_("--%s option is deprecated. Use --%s option instead."),
-                    depOptHandler_->getName().c_str(),
-                    repOptHandler_->getName().c_str()));
+                    depOptHandler_->getName(),
+                    repOptHandler_->getName()));
     repOptHandler_->parse(option, arg);
   } else {
     A2_LOG_WARN(fmt(_("--%s option is deprecated."),
-                    depOptHandler_->getName().c_str()));
+                    depOptHandler_->getName()));
   }
 }
 
@@ -753,12 +754,12 @@ std::string DeprecatedOptionHandler::toTagString() const
   return depOptHandler_->toTagString();
 }
 
-const std::string& DeprecatedOptionHandler::getName() const
+const char* DeprecatedOptionHandler::getName() const
 {
   return depOptHandler_->getName();
 }
 
-const std::string& DeprecatedOptionHandler::getDescription() const
+const char* DeprecatedOptionHandler::getDescription() const
 {
   return depOptHandler_->getDescription();
 }
diff --git a/src/OptionHandlerImpl.h b/src/OptionHandlerImpl.h
index c4799894..b1997d01 100644
--- a/src/OptionHandlerImpl.h
+++ b/src/OptionHandlerImpl.h
@@ -49,7 +49,7 @@ class Pref;
 class BooleanOptionHandler : public AbstractOptionHandler {
 public:
   BooleanOptionHandler(const Pref* pref,
-                       const std::string& description = NO_DESCRIPTION,
+                       const char* description = NO_DESCRIPTION,
                        const std::string& defaultValue = NO_DEFAULT_VALUE,
                        OptionHandler::ARG_TYPE argType = OptionHandler::REQ_ARG,
                        char shortName = 0);
@@ -64,7 +64,7 @@ private:
   int32_t max_;
 public:
   IntegerRangeOptionHandler(const Pref* pref,
-                            const std::string& description,
+                            const char* description,
                             const std::string& defaultValue,
                             int32_t min, int32_t max,
                             char shortName = 0);
@@ -79,7 +79,7 @@ private:
   int64_t max_;
 public:
   NumberOptionHandler(const Pref* pref,
-                      const std::string& description = NO_DESCRIPTION,
+                      const char* description = NO_DESCRIPTION,
                       const std::string& defaultValue = NO_DEFAULT_VALUE,
                       int64_t min = -1,
                       int64_t max = -1,
@@ -94,7 +94,7 @@ public:
 class UnitNumberOptionHandler : public NumberOptionHandler {
 public:
   UnitNumberOptionHandler(const Pref* pref,
-                          const std::string& description = NO_DESCRIPTION,
+                          const char* description = NO_DESCRIPTION,
                           const std::string& defaultValue = NO_DEFAULT_VALUE,
                           int64_t min = -1,
                           int64_t max = -1,
@@ -109,7 +109,7 @@ private:
   double max_;
 public:
   FloatNumberOptionHandler(const Pref* pref,
-                           const std::string& description = NO_DESCRIPTION,
+                           const char* description = NO_DESCRIPTION,
                            const std::string& defaultValue = NO_DEFAULT_VALUE,
                            double min = -1, double max = -1,
                            char shortName = 0);
@@ -123,7 +123,7 @@ private:
   std::string possibleValuesString_;
 public:
   DefaultOptionHandler(const Pref* pref,
-                       const std::string& description = NO_DESCRIPTION,
+                       const char* description = NO_DESCRIPTION,
                        const std::string& defaultValue = NO_DEFAULT_VALUE,
                        const std::string& possibleValuesString = A2STR::NIL,
                        OptionHandler::ARG_TYPE argType = OptionHandler::REQ_ARG,
@@ -139,7 +139,7 @@ private:
   std::string possibleValuesString_;
 public:
   CumulativeOptionHandler(const Pref* pref,
-                          const std::string& description,
+                          const char* description,
                           const std::string& defaultValue,
                           const std::string& delim,
                           const std::string& possibleValuesString = A2STR::NIL,
@@ -154,7 +154,7 @@ public:
 class IndexOutOptionHandler : public AbstractOptionHandler {
 public:
   IndexOutOptionHandler(const Pref* pref,
-                        const std::string& description,
+                        const char* description,
                         char shortName = 0);
   virtual ~IndexOutOptionHandler();
   virtual void parseArg(Option& option, const std::string& optarg);
@@ -165,7 +165,7 @@ public:
 class ChecksumOptionHandler : public AbstractOptionHandler {
 public:
   ChecksumOptionHandler(const Pref* pref,
-                        const std::string& description,
+                        const char* description,
                         char shortName = 0);
   virtual ~ChecksumOptionHandler();
   virtual void parseArg(Option& option, const std::string& optarg);
@@ -178,23 +178,23 @@ private:
   std::vector<std::string> validParamValues_;
 public:
   ParameterOptionHandler(const Pref* pref,
-                         const std::string& description,
+                         const char* description,
                          const std::string& defaultValue,
                          const std::vector<std::string>& validParamValues,
                          char shortName = 0);
   ParameterOptionHandler(const Pref* pref,
-                         const std::string& description,
+                         const char* description,
                          const std::string& defaultValue,
                          const std::string& validParamValue,
                          char shortName = 0);
   ParameterOptionHandler(const Pref* pref,
-                         const std::string& description,
+                         const char* description,
                          const std::string& defaultValue,
                          const std::string& validParamValue1,
                          const std::string& validParamValue2,
                          char shortName = 0);
   ParameterOptionHandler(const Pref* pref,
-                         const std::string& description,
+                         const char* description,
                          const std::string& defaultValue,
                          const std::string& validParamValue1,
                          const std::string& validParamValue2,
@@ -211,7 +211,7 @@ private:
   const Pref* portOptionName_;
 public:
   HostPortOptionHandler(const Pref* pref,
-                        const std::string& description,
+                        const char* description,
                         const std::string& defaultValue,
                         const Pref* hostOptionName,
                         const Pref* portOptionName,
@@ -226,7 +226,7 @@ public:
 class HttpProxyUserOptionHandler:public AbstractOptionHandler {
 public:
   HttpProxyUserOptionHandler(const Pref* pref,
-                             const std::string& description,
+                             const char* description,
                              const std::string& defaultValue,
                              char shortName = 0);
   virtual void parseArg(Option& option, const std::string& optarg);
@@ -236,7 +236,7 @@ public:
 class HttpProxyPasswdOptionHandler:public AbstractOptionHandler {
 public:
   HttpProxyPasswdOptionHandler(const Pref* pref,
-                               const std::string& description,
+                               const char* description,
                                const std::string& defaultValue,
                                char shortName = 0);
   virtual void parseArg(Option& option, const std::string& optarg);
@@ -249,7 +249,7 @@ private:
   const Pref* proxyPasswdPref_;
 public:
   HttpProxyOptionHandler(const Pref* pref,
-                         const std::string& description,
+                         const char* description,
                          const std::string& defaultValue,
                          char shortName = 0);
   virtual ~HttpProxyOptionHandler();
@@ -263,7 +263,7 @@ private:
 public:
   LocalFilePathOptionHandler
   (const Pref* pref,
-   const std::string& description = NO_DESCRIPTION,
+   const char* description = NO_DESCRIPTION,
    const std::string& defaultValue = NO_DEFAULT_VALUE,
    bool acceptStdin = false,
    char shortName = 0);
@@ -275,7 +275,7 @@ class PrioritizePieceOptionHandler:public AbstractOptionHandler {
 public:
   PrioritizePieceOptionHandler
   (const Pref* pref,
-   const std::string& description = NO_DESCRIPTION,
+   const char* description = NO_DESCRIPTION,
    const std::string& defaultValue = NO_DEFAULT_VALUE,
    char shortName = 0);
   virtual void parseArg(Option& option, const std::string& optarg);
@@ -301,8 +301,8 @@ public:
   virtual bool hasTag(const std::string& tag) const;
   virtual void addTag(const std::string& tag);
   virtual std::string toTagString() const;
-  virtual const std::string& getName() const;
-  virtual const std::string& getDescription() const;
+  virtual const char* getName() const;
+  virtual const char* getDescription() const;
   virtual const std::string& getDefaultValue() const;
   virtual bool isHidden() const;
   virtual void hide();
diff --git a/src/OptionParser.cc b/src/OptionParser.cc
index a1e4090d..2c2709a7 100644
--- a/src/OptionParser.cc
+++ b/src/OptionParser.cc
@@ -83,9 +83,9 @@ void putOptions(struct option* longOpts, int* plopt,
   for(; first != last; ++first) {
     if(*first && !(*first)->isHidden()) {
 #ifdef HAVE_OPTION_CONST_NAME
-      (*longOpts).name = (*first)->getName().c_str();
+      (*longOpts).name = (*first)->getName();
 #else // !HAVE_OPTION_CONST_NAME
-      (*longOpts).name = strdup((*first)->getName().c_str());
+      (*longOpts).name = strdup((*first)->getName());
 #endif // !HAVE_OPTION_CONST_NAME
       switch((*first)->getArgType()) {
       case OptionHandler::REQ_ARG:
@@ -146,7 +146,7 @@ void OptionParser::parseArg
                                              handlers_.end());
   int lopt;
   array_ptr<struct option> longOpts(new struct option[numPublicOption+1]);
-  putOptions(longOpts, &lopt,handlers_.begin(),handlers_.end());
+  putOptions(longOpts, &lopt, handlers_.begin(), handlers_.end());
   std::string optstring = createOptstring(handlers_.begin(), handlers_.end());
   while(1) {
     int c = getopt_long(argc, argv, optstring.c_str(), longOpts, 0);
@@ -245,9 +245,13 @@ OptionParser::findByNameSubstring(const std::string& substring) const
   std::vector<SharedHandle<OptionHandler> > result;
   for(std::vector<SharedHandle<OptionHandler> >::const_iterator i =
         handlers_.begin(), eoi = handlers_.end(); i != eoi; ++i) {
-    if(*i && !(*i)->isHidden() &&
-       (*i)->getName().find(substring) != std::string::npos) {
-      result.push_back(*i);
+    if(*i && !(*i)->isHidden()) {
+      size_t nameLen = strlen((*i)->getName());
+      if(std::search((*i)->getName(), (*i)->getName()+nameLen,
+                     substring.begin(), substring.end()) !=
+         (*i)->getName()+nameLen) {
+        result.push_back(*i);
+      }
     }
   }
   return result;  
diff --git a/src/SessionSerializer.cc b/src/SessionSerializer.cc
index 59a955b8..f4dc4204 100644
--- a/src/SessionSerializer.cc
+++ b/src/SessionSerializer.cc
@@ -91,12 +91,12 @@ bool writeOption(BufferedFile& fp, const SharedHandle<Option>& op)
                     false, false);
         for(std::vector<std::string>::const_iterator j = v.begin(),
               eoj = v.end(); j != eoj; ++j) {
-          if(fp.printf(" %s=%s\n", pref->k.c_str(), (*j).c_str()) < 0) {
+          if(fp.printf(" %s=%s\n", pref->k, (*j).c_str()) < 0) {
             return false;
           }
         }
       } else {
-        if(fp.printf(" %s=%s\n", pref->k.c_str(), op->get(pref).c_str()) < 0) {
+        if(fp.printf(" %s=%s\n", pref->k, op->get(pref).c_str()) < 0) {
           return false;
         }
       }
@@ -186,7 +186,7 @@ bool SessionSerializer::save(BufferedFile& fp) const
       // PREF_PAUSE was removed from option, so save it here looking
       // property separately.
       if((*itr)->isPauseRequested()) {
-        if(fp.printf(" %s=true\n", PREF_PAUSE->k.c_str()) < 0) {
+        if(fp.printf(" %s=true\n", PREF_PAUSE->k) < 0) {
           return false;
         }
       }
diff --git a/src/option_processing.cc b/src/option_processing.cc
index 573b95ae..aea1b360 100644
--- a/src/option_processing.cc
+++ b/src/option_processing.cc
@@ -153,7 +153,7 @@ void option_processing(Option& op, std::vector<std::string>& uris,
                                  e.stackTrace().c_str());
           const SharedHandle<OptionHandler>& h = oparser->find(e.getPref());
           if(h) {
-            global::cerr()->printf("Usage:\n%s\n", h->getDescription().c_str());
+            global::cerr()->printf("Usage:\n%s\n", h->getDescription());
           }
           exit(e.getErrorCode());
         } catch(Exception& e) {
diff --git a/src/prefs.cc b/src/prefs.cc
index 9e06dab9..a8a95cc2 100644
--- a/src/prefs.cc
+++ b/src/prefs.cc
@@ -40,7 +40,7 @@
 
 namespace aria2 {
 
-Pref::Pref(const std::string& k, size_t i):k(k), i(i) {}
+Pref::Pref(const char* k, size_t i):k(k), i(i) {}
 
 namespace {
 
@@ -55,7 +55,7 @@ public:
   {
     return count_++;
   }
-  Pref* makePref(const std::string& key)
+  Pref* makePref(const char* key)
   {
     size_t id = nextId();
     Pref* pref = new Pref(key, id);
@@ -93,7 +93,7 @@ PrefFactory* getPrefFactory()
   return pf;
 }
 
-Pref* makePref(const std::string& key)
+Pref* makePref(const char* key)
 {
   return getPrefFactory()->makePref(key);
 }
diff --git a/src/prefs.h b/src/prefs.h
index 5a36903e..562d89f0 100644
--- a/src/prefs.h
+++ b/src/prefs.h
@@ -41,9 +41,9 @@
 namespace aria2 {
 
 struct Pref {
-  Pref(const std::string& k, size_t i);
+  Pref(const char* k, size_t i);
   // Keyword, aka Option Name
-  std::string k;
+  const char* k;
   // Option ID
   size_t i;
 };