Library: Added buffer-size attribute for <alloc>

Author: danmar

cfg/cppcheck-cfg.rng

@@ -32,6 +32,9 @@
               <optional>
                 <attribute name="arg"><ref name="ARGNO"/></attribute>
               </optional>
+              <optional>
+                <attribute name="buffer-size"><ref name="DATA-BUFFER-SIZE"/></attribute>
+              </optional>
               <ref name="DATA-NAME"/>
             </element>
             <element name="use"><ref name="DATA-EXTNAME"/></element>
@@ -458,6 +461,12 @@
     </data>
   </define>
 
+  <define name="DATA-BUFFER-SIZE">
+    <data type="string">
+      <param name="pattern">arg-value:[1-3]</param>
+    </data>
+  </define>
+
   <define name="CONTAINER-ACTION">
     <choice>
       <value>resize</value>

cfg/std.cfg

@@ -7320,7 +7320,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <arg nr="2"/>
   </function>
   <memory>
-    <alloc init="false">malloc</alloc>
+    <alloc init="false" buffer-size="arg-value:1">malloc</alloc>
     <alloc init="true">calloc</alloc>
     <alloc init="false">aligned_alloc</alloc>
     <alloc init="false">valloc</alloc>

lib/library.cpp

@@ -200,6 +200,13 @@ Library::Error Library::load(const tinyxml2::XMLDocument &doc)
                         temp.arg = atoi(arg);
                     else
                         temp.arg = -1;
+
+                    const char *bufferSize = memorynode->Attribute("buffer-size");
+                    if (bufferSize && std::strncmp(bufferSize, "arg-value:", 10) == 0)
+                        temp.bufferSizeArgValue = bufferSize[10] - '0';
+                    else
+                        temp.bufferSizeArgValue = -1;
+
                     mAlloc[memorynode->GetText()] = temp;
                 } else if (memorynodename == "dealloc") {
                     AllocFunc temp;

lib/library.h

@@ -73,6 +73,7 @@ class CPPCHECKLIB Library {
     struct AllocFunc {
         int groupId;
         int arg;
+        int bufferSizeArgValue;
     };
 
     /** get allocation info for function */