Simplify Tokens: Replace NULL with 0 and '(char *)0' with '0'

Makefile

@@ -1,6 +1,6 @@
 SRCS=CheckBufferOverrun.cpp  CheckClass.cpp  CheckHeaders.cpp  CheckMemoryLeak.cpp  CheckOther.cpp  CommonCheck.cpp  FileLister.cpp preprocessor.cpp tokenize.cpp cppcheck.cpp settings.cpp
 OBJS=$(SRCS:%.cpp=%.o)
-TESTS=testbufferoverrun.o	testcharvar.o	testconstructors.o	testdivision.o	testincompletestatement.o	testmemleak.o	testpreprocessor.o	testtokenize.o	testunusedprivfunc.o	testunusedvar.o settings.o cppcheck.o
+TESTS=testbufferoverrun.o	testcharvar.o	testconstructors.o	testdivision.o	testincompletestatement.o	testmemleak.o	testpreprocessor.o	testsimplifytokens.o	testtokenize.o	testunusedprivfunc.o	testunusedvar.o settings.o cppcheck.o
 BIN = ${DESTDIR}/usr/bin
 
 all:	${OBJS} main.o
@@ -47,6 +47,8 @@ testrunner.o: testrunner.cpp testsuite.h
 	g++ -Wall -pedantic -g -I. -o $@ -c $*.cpp
 testsuite.o: testsuite.cpp testsuite.h
 	g++ -Wall -pedantic -g -I. -o $@ -c $*.cpp
+testsimplifytokens.o:	testsimplifytokens.cpp	testsuite.h	tokenize.h
+	g++ -Wall -pedantic -g -I. -o $@ -c $*.cpp
 testtokenize.o:testtokenize.cpp  testsuite.h tokenize.h
 	g++ -Wall -pedantic -g -I. -o $@ -c $*.cpp
 testunusedprivfunc.o: testunusedprivfunc.cpp tokenize.h CheckClass.h testsuite.h

testsimplifytokens.cpp

@@ -0,0 +1,63 @@
+/*
+ * c++check - c/c++ syntax checking
+ * Copyright (C) 2007 Daniel Marjamäki
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/
+ */
+
+
+
+#include "testsuite.h"
+#include "tokenize.h"
+#include <sstream>
+
+class TestSimplifyTokens : public TestFixture
+{
+public:
+    TestSimplifyTokens() : TestFixture("TestSimplifyTokens")
+    { }
+
+
+private:
+
+    void run()
+    {
+        TEST_CASE( cast0 );
+    }
+
+    static std::string tok(const char code[])
+    {
+        std::istringstream istr(code);
+        Tokenizer tokenizer;
+        tokenizer.TokenizeCode( istr );
+        tokenizer.SimplifyTokenList();
+
+        std::string ret;
+        for ( const TOKEN *tok = tokens; tok; tok = tok->next )
+        {
+            ret += std::string(tok->str) + " ";
+        }
+
+        return ret;
+    }
+
+    void cast0()
+    {
+        const char code1[] = " if ( p == (char *)0 ) ";
+        const char code2[] = " if ( p == 0 ) ";
+        ASSERT_EQUALS( tok(code1), tok(code2) );
+    }
+};
+
+REGISTER_TEST( TestSimplifyTokens )

tokenize.cpp

@@ -1012,6 +1012,23 @@ void Tokenizer::SimplifyTokenList()
                 }
             }
         }
+    }
+
+    // Replace NULL with 0..
+    for ( TOKEN *tok = tokens; tok; tok = tok->next )
+    {
+        if ( Match(tok, "NULL") )
+            tok->setstr("0");
+    }
+
+    // Replace pointer casts of 0.. "(char *)0" => "0"
+    for ( TOKEN *tok = tokens; tok; tok = tok->next )
+    {
+        if ( Match(tok->next, "( %type% * ) 0") || Match(tok->next,"( %type% %type% * ) 0") )
+        {
+            while (!Match(tok->next,"0"))
+                DeleteNextToken(tok);
+        }
     }
 }
 //---------------------------------------------------------------------------