fix Coverity issues

src/App/Expression.h

@@ -507,7 +507,7 @@ public:
   std::string string;
   FunctionExpression::Function func;
   ObjectIdentifier::String string_or_identifier;
-  semantic_type() {}
+  semantic_type() : expr(0), ivalue(0), fvalue(0), func(FunctionExpression::NONE) {}
 };
 
 #define YYSTYPE semantic_type

src/Base/FileInfo.cpp

@@ -169,31 +169,31 @@ std::string FileInfo::getTempFileName(const char* FileName, const char* Path)
 
     return std::string(ConvertFromWideString(std::wstring(buf)));
 #else
-    char buf[PATH_MAX+1];
+    std::string buf;
 
     // Path where the file is located
     if (Path)
-        std::strncpy(buf, Path, PATH_MAX);
+        buf = Path;
     else
-        std::strncpy(buf, getTempPath().c_str(), PATH_MAX);
-
-    buf[PATH_MAX] = 0; // null termination needed
+        buf = getTempPath();
 
     // File name in the path 
     if (FileName) {
-        std::strcat(buf, "/");
-        std::strcat(buf, FileName);
-        std::strcat(buf, "XXXXXX");
+        buf += "/";
+        buf += FileName;
+        buf += "XXXXXX";
+    }
+    else {
+        buf += "/fileXXXXXX";
     }
-    else
-        std::strcat(buf, "/fileXXXXXX");
 
-    int id = mkstemp(buf);
+    int id = mkstemp(static_cast<char*>(buf.c_str());
     if (id > -1) {
         FILE* file = fdopen(id, "w");
         fclose(file);
+        unlink(buf.c_str());
     }
-    return std::string(buf);
+    return buf;
 #endif
 }
 

src/Base/PyTools.c

@@ -40,8 +40,10 @@ PP_Run_Method(PyObject *pobject,  const char *method,
 
     Py_Initialize();                               /* init if first time */
     pmeth = PyObject_GetAttrString(pobject, method);  
-    if (pmeth == NULL)                             /* get callable object */
+    if (pmeth == NULL) {                           /* get callable object */
+        va_end(argslist);
         return -1;                                 /* bound method? has self */
+    }
 	/* handle zero args different */
 //	if(resfmt == 0 || strcmp(resfmt,"") == 0)
 //		pargs = Py_BuildValue("()");

src/Base/gzstream.h

@@ -65,7 +65,7 @@ private:
 
     int flush_buffer();
 public:
-    gzstreambuf() : opened(0) {
+    gzstreambuf() : file(0), opened(0), mode(0) {
         setp( buffer, buffer + (bufferSize-1));
         setg( buffer + 4,     // beginning of putback area
               buffer + 4,     // read position