diff --git a/cfg/avr.cfg b/cfg/avr.cfg
index 609ed7870..d8681d267 100644
--- a/cfg/avr.cfg
+++ b/cfg/avr.cfg
@@ -288,5 +288,13 @@
 	  <noreturn>false</noreturn>
 	  <leak-ignore/>
 	  <arg nr="1"><not-uninit/></arg>
+  </function> 
+  <function name="memccpy">
+	  <noreturn>false</noreturn>
+	  <leak-ignore/>
+	  <arg nr="1"><not-null/></arg>
+	  <arg nr="2"><not-uninit/></arg>
+	  <arg nr="3"><not-uninit/></arg>
+	  <arg nr="4"><not-uninit/></arg>
   </function>     
 </def>
diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index 68c8ad539..1acedb8b8 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -58,6 +58,40 @@
        <leak-ignore/>
        <arg nr="1"><not-null/></arg>
   </function>
+  <function name="memmem">
+       <noreturn>false</noreturn>
+       <leak-ignore/>
+       <arg nr="1"><not-uninit/><not-null/></arg>
+       <arg nr="2"><not-uninit/></arg>
+       <arg nr="3"><not-uninit/><not-null/></arg>
+       <arg nr="4"><not-uninit/></arg>
+  </function>  
+  <function name="memrchr">
+        <noreturn>false</noreturn>
+        <leak-ignore/>
+        <arg nr="1"><not-null/><not-uninit/></arg>
+        <arg nr="2"><not-uninit/><not-bool/><valid>0:</valid></arg>
+        <arg nr="3"><not-bool/><valid>0:</valid></arg>
+  </function>  
+  <function name="rawmemchr">
+        <noreturn>false</noreturn>
+        <leak-ignore/>
+        <arg nr="1"><not-null/><not-uninit/></arg>
+        <arg nr="2"><not-uninit/><not-bool/><valid>0:</valid></arg>
+  </function>
+  <function name="strcasecmp">
+       <noreturn>false</noreturn>
+       <leak-ignore/>
+       <arg nr="1"><not-uninit/><not-null/></arg>
+       <arg nr="2"><not-uninit/><not-null/></arg>
+  </function>
+  <function name="strncasecmp">
+       <noreturn>false</noreturn>
+       <leak-ignore/>
+       <arg nr="1"><not-uninit/><not-null/></arg>
+       <arg nr="2"><not-uninit/><not-null/></arg>
+       <arg nr="3"><not-bool/><valid>0:</valid></arg>
+  </function>     
   <memory>
     <dealloc>free</dealloc>
     <alloc init="true">strdup</alloc>