scan-build: work around optin.performance.Padding

Since the layout has to be preserved, padding is added.

htp/htp.h

@@ -221,6 +221,8 @@ struct htp_tx_t {
      */
     int is_config_shared;
 
+    SCAN_BUILD_X64_PADDING(int pad0);
+
     /** The user data associated with this transaction. */
     void *user_data;
 
@@ -230,6 +232,8 @@ struct htp_tx_t {
     /** Contains a count of how many empty lines were skipped before the request line. */
     unsigned int request_ignored_lines;
 
+    SCAN_BUILD_X64_PADDING(int pad1;)
+
     /** The first line of this request. */
     bstr *request_line;      
 
@@ -239,6 +243,8 @@ struct htp_tx_t {
     /** Request method, as number. Available only if we were able to recognize the request method. */
     enum htp_method_t request_method_number;
 
+    SCAN_BUILD_X64_PADDING(int pad2;)
+
     /**
      * Request URI, raw, as given to us on the request line. This field can take different forms,
      * for example authority for CONNECT methods, absolute URIs for proxy requests, and the query
@@ -421,6 +427,8 @@ struct htp_tx_t {
      */
     int response_protocol_number;
 
+    SCAN_BUILD_X64_PADDING(int pad3;)
+
     /**
      * Response status code, as text. Starts as NULL and can remain NULL on
      * an invalid response that does not specify status code.
@@ -445,6 +453,8 @@ struct htp_tx_t {
     /** Have we seen the server respond with a 100 response? */
     int seen_100continue;      
 
+    SCAN_BUILD_X64_PADDING(int pad4;)
+
     /** Parsed response headers. Contains instances of htp_header_t. */
     htp_table_t *response_headers;   
 
@@ -512,6 +522,8 @@ struct htp_tx_t {
      */
     enum htp_content_encoding_t response_content_encoding_processing;
 
+    SCAN_BUILD_X64_PADDING(int pad5;)
+
     /**
      * This field will contain the response content type when that information
      * is available in response headers. The contents of the field will be converted

htp/htp_core.h

@@ -43,6 +43,57 @@
 extern "C" {
 #endif
 
+/* Define SCAN_BUILD_X64_PADDING to add padding to structs for
+ * when clang scan-build is used with the optin.performance.Padding
+ * checker. */
+#if defined(__clang_analyzer__)
+/** FreeBSD does not define __WORDSIZE, but it uses __LONG_BIT */
+#ifndef __WORDSIZE
+    #ifdef __LONG_BIT
+        #define __WORDSIZE __LONG_BIT
+    #else
+        #ifdef LONG_BIT
+            #define __WORDSIZE LONG_BIT
+        #endif
+    #endif
+#endif
+
+/** Windows does not define __WORDSIZE, but it uses __X86__ */
+#ifndef __WORDSIZE
+    #if defined(__X86__) || defined(_X86_) || defined(_M_IX86)
+        #define __WORDSIZE 32
+    #else
+        #if defined(__X86_64__) || defined(_X86_64_) || \
+            defined(__x86_64)   || defined(__x86_64__) || \
+            defined(__amd64)    || defined(__amd64__)
+            #define __WORDSIZE 64
+        #endif
+    #endif
+#endif
+
+/** if not succesful yet try the data models */
+#ifndef __WORDSIZE
+    #if defined(_ILP32) || defined(__ILP32__)
+        #define __WORDSIZE 32
+    #endif
+    #if defined(_LP64) || defined(__LP64__)
+        #define __WORDSIZE 64
+    #endif
+#endif
+
+#ifndef __WORDSIZE
+    #define __WORDSIZE 64
+#endif
+
+#if __WORDSIZE==64
+#define SCAN_BUILD_X64_PADDING(x)   x
+#else
+#define SCAN_BUILD_X64_PADDING(_x)
+#endif
+#else /* else __clang_analyzer__ */
+#define SCAN_BUILD_X64_PADDING(_x)
+#endif /* end __clang_analyzer__ */
+
 typedef int htp_status_t;
 
 typedef struct htp_cfg_t htp_cfg_t;