Fixed #8975 (Syntax error for valid C code)

Author: danmar

lib/tokenize.cpp

@@ -7338,6 +7338,11 @@ bool Tokenizer::simplifyCAlternativeTokens()
         const std::map<std::string, std::string>::const_iterator cOpIt = cAlternativeTokens.find(tok->str());
         if (cOpIt != cAlternativeTokens.end()) {
             alt.push_back(tok);
+
+            // Is this a variable declaration..
+            if (isC() && Token::Match(tok->previous(), "%type%|* %name% [;,=]"))
+                return false;
+
             if (!Token::Match(tok->previous(), "%name%|%num%|%char%|)|]|> %name% %name%|%num%|%char%|%op%|("))
                 continue;
             if (Token::Match(tok->next(), "%assign%|%or%|%oror%|&&|*|/|%|^") && !Token::Match(tok->previous(), "%num%|%char%|) %name% *"))

test/testtokenize.cpp

@@ -6307,6 +6307,17 @@ class TestTokenizer : public TestFixture {
                       tokenizeAndStringify("void f(const char *str) { while (*str=='!' or *str=='['){} }"));
         // #9920
         ASSERT_EQUALS("result = ch != s . end ( ) && * ch == ':' ;", tokenizeAndStringify("result = ch != s.end() and *ch == ':';", false, true, Settings::Native, "test.c"));
+
+        // #8975
+        ASSERT_EQUALS("void foo ( ) {\n"
+                      "char * or ;\n"
+                      "while ( ( * or != 0 ) && ( * or != '|' ) ) { or ++ ; }\n"
+                      "}",
+                      tokenizeAndStringify(
+                          "void foo() {\n"
+                          "  char *or;\n"
+                          "  while ((*or != 0) && (*or != '|')) or++;\n"
+                          "}", false, true, Settings::Native, "test.c"));
     }
 
     void simplifyCalculations() {