diff --git a/cfg/std.cfg b/cfg/std.cfg
index cf62510df..4572ab6f6 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -3087,6 +3087,7 @@
       <not-uninit/>
     </arg>
     <arg nr="3">
+      <not-uninit/>
       <not-bool/>
       <valid>0:</valid>
     </arg>
@@ -3098,12 +3099,15 @@
     <arg nr="1">
       <not-null/>
       <not-uninit/>
+      <strz/>
+      <minsize type="argvalue" arg="3"/>
     </arg>
     <arg nr="2">
       <not-null/>
       <not-uninit/>
     </arg>
     <arg nr="3">
+      <not-uninit/>
       <not-bool/>
       <valid>0:</valid>
     </arg>
@@ -3123,6 +3127,7 @@
       <not-uninit/>
     </arg>
     <arg nr="3">
+      <not-uninit/>
       <not-bool/>
       <valid>0:</valid>
     </arg>
@@ -3142,6 +3147,7 @@
       <not-uninit/>
     </arg>
     <arg nr="3">
+      <not-uninit/>
       <not-bool/>
       <valid>0:</valid>
     </arg>
diff --git a/test/cfg/std.c b/test/cfg/std.c
index 05b29f00f..618a1985e 100644
--- a/test/cfg/std.c
+++ b/test/cfg/std.c
@@ -2975,40 +2975,76 @@ void uninivar_strpbrk(void)
     (void)strpbrk(cs,ct);
 }
 
-void uninivar_strncat(void)
+void uninivar_strncat(char *Ct, char *S, size_t N)
 {
     char *ct;
     char *s;
     size_t n;
     // cppcheck-suppress uninitvar
     (void)strncat(ct,s,n);
+    // cppcheck-suppress uninitvar
+    (void)strncat(ct,S,N);
+    // cppcheck-suppress uninitvar
+    (void)strncat(Ct,s,N);
+    // cppcheck-suppress uninitvar
+    (void)strncat(Ct,S,n);
+
+    // no warning is expected for
+    (void)strncat(Ct,S,N);
 }
 
-void uninivar_wcsncat(void)
+void uninivar_wcsncat(wchar_t *Ct, wchar_t *S, size_t N)
 {
     wchar_t *ct;
     wchar_t *s;
     size_t n;
     // cppcheck-suppress uninitvar
     (void)wcsncat(ct,s,n);
+    // cppcheck-suppress uninitvar
+    (void)wcsncat(ct,S,N);
+    // cppcheck-suppress uninitvar
+    (void)wcsncat(Ct,s,N);
+    // cppcheck-suppress uninitvar
+    (void)wcsncat(Ct,S,n);
+
+    // no warning is expected for
+    (void)wcsncat(Ct,S,N);
 }
 
-void uninivar_strncmp(void)
+void uninivar_strncmp(char *Ct, char *S, size_t N)
 {
     char *ct;
     char *s;
     size_t n;
     // cppcheck-suppress uninitvar
     (void)strncmp(ct,s,n);
+    // cppcheck-suppress uninitvar
+    (void)strncmp(ct,S,N);
+    // cppcheck-suppress uninitvar
+    (void)strncmp(Ct,s,N);
+    // cppcheck-suppress uninitvar
+    (void)strncmp(Ct,S,n);
+
+    // no warning is expected for
+    (void)strncmp(Ct,S,N);
 }
 
-void uninivar_wcsncmp(void)
+void uninivar_wcsncmp(wchar_t *Ct, wchar_t *S, size_t N)
 {
     wchar_t *ct;
     wchar_t *s;
     size_t n;
     // cppcheck-suppress uninitvar
     (void)wcsncmp(ct,s,n);
+    // cppcheck-suppress uninitvar
+    (void)wcsncmp(ct,S,N);
+    // cppcheck-suppress uninitvar
+    (void)wcsncmp(Ct,s,N);
+    // cppcheck-suppress uninitvar
+    (void)wcsncmp(Ct,S,n);
+
+    // no warning is expected for
+    (void)wcsncmp(Ct,S,N);
 }
 
 void uninivar_strstr(void)
diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index 544a20c30..ef8ce2615 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -2304,40 +2304,76 @@ void uninivar_strpbrk(void)
     (void)std::strpbrk(cs,ct);
 }
 
-void uninivar_strncat(void)
+void uninivar_strncat(char *Ct, char *S, size_t N)
 {
     char *ct;
     char *s;
     size_t n;
     // cppcheck-suppress uninitvar
     (void)std::strncat(ct,s,n);
+    // cppcheck-suppress uninitvar
+    (void)std::strncat(ct,S,N);
+    // cppcheck-suppress uninitvar
+    (void)std::strncat(Ct,s,N);
+    // cppcheck-suppress uninitvar
+    (void)std::strncat(Ct,S,n);
+
+    // no warning is expected for
+    (void)std::strncat(Ct,S,N);
 }
 
-void uninivar_wcsncat(void)
+void uninivar_wcsncat(wchar_t *Ct, wchar_t *S, size_t N)
 {
     wchar_t *ct;
     wchar_t *s;
     size_t n;
     // cppcheck-suppress uninitvar
     (void)std::wcsncat(ct,s,n);
+    // cppcheck-suppress uninitvar
+    (void)std::wcsncat(ct,S,N);
+    // cppcheck-suppress uninitvar
+    (void)std::wcsncat(Ct,s,N);
+    // cppcheck-suppress uninitvar
+    (void)std::wcsncat(Ct,S,n);
+
+    // no warning is expected for
+    (void)std::wcsncat(Ct,S,N);
 }
 
-void uninivar_strncmp(void)
+void uninivar_strncmp(char *Ct, char *S, size_t N)
 {
     char *ct;
     char *s;
     size_t n;
     // cppcheck-suppress uninitvar
     (void)std::strncmp(ct,s,n);
+    // cppcheck-suppress uninitvar
+    (void)std::strncmp(ct,S,N);
+    // cppcheck-suppress uninitvar
+    (void)std::strncmp(Ct,s,N);
+    // cppcheck-suppress uninitvar
+    (void)std::strncmp(Ct,S,n);
+
+    // no warning is expected for
+    (void)std::strncmp(Ct,S,N);
 }
 
-void uninivar_wcsncmp(void)
+void uninivar_wcsncmp(wchar_t *Ct, wchar_t *S, size_t N)
 {
     wchar_t *ct;
     wchar_t *s;
     size_t n;
     // cppcheck-suppress uninitvar
     (void)std::wcsncmp(ct,s,n);
+    // cppcheck-suppress uninitvar
+    (void)std::wcsncmp(ct,S,N);
+    // cppcheck-suppress uninitvar
+    (void)std::wcsncmp(Ct,s,N);
+    // cppcheck-suppress uninitvar
+    (void)std::wcsncmp(Ct,S,n);
+
+    // no warning is expected for
+    (void)std::wcsncmp(Ct,S,N);
 }
 
 void uninivar_strstr(void)