-extern BOOL is_tainted(const void *);
-extern void die_tainted(const uschar *, const uschar *, int);
-
-static inline uschar * __Ustrcat(uschar * dst, const uschar * src, const char * func, int line)
-{
-#ifndef COMPILE_UTILITY
-if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrcat", CUS func, line);
-#endif
-return US strcat(CS dst, CCS src);
-}
-static inline uschar * __Ustrcpy(uschar * dst, const uschar * src, const char * func, int line)
-{
-#ifndef COMPILE_UTILITY
-if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrcpy", CUS func, line);
-#endif
-return US strcpy(CS dst, CCS src);
-}
-static inline uschar * __Ustrncat(uschar * dst, const uschar * src, size_t n, const char * func, int line)
-{
-#ifndef COMPILE_UTILITY
-if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrncat", CUS func, line);
-#endif
-return US strncat(CS dst, CCS src, n);
-}
-static inline uschar * __Ustrncpy(uschar * dst, const uschar * src, size_t n, const char * func, int line)
-{
-#ifndef COMPILE_UTILITY
-if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrncpy", CUS func, line);
+#if defined(EM_VERSION_C) || defined(LOCAL_SCAN) || defined(DLFUNC_IMPL)
+# define Ustrcat(s,t) strcat(CS(s), CCS(t))
+# define Ustrcpy(s,t) strcpy(CS(s), CCS(t))
+# define Ustrncat(s,t,n) strncat(CS(s), CCS(t), n)
+# define Ustrncpy(s,t,n) strncpy(CS(s), CCS(t), n)
+#else
+# define Ustrcat(s,t) __Ustrcat(s, CUS(t), __FUNCTION__, __LINE__)
+# define Ustrcpy(s,t) __Ustrcpy(s, CUS(t), __FUNCTION__, __LINE__)
+# define Ustrncat(s,t,n) __Ustrncat(s, CUS(t), n, __FUNCTION__, __LINE__)
+# define Ustrncpy(s,t,n) __Ustrncpy(s, CUS(t), n, __FUNCTION__, __LINE__)