extern int8 *stpcpy( int8 *dest, const int8 *src);
extern int8 *strstr_len( const int8 *haystack, int32 haystack_len, const int8 *needle);
extern int8 *strdup_printf( const int8 *format, ...);
extern int8 *strconcat( const int8 *string1, ...);
extern char *zstrncpy( char *dst, const char *src, size_t n);