void *xmalloc(size_t);
void *xcalloc(size_t, size_t);
void *xrealloc(void *, size_t);
+void *xmemdup(const void *, size_t);
+char *xmemdup0(const char *, size_t);
char *xstrdup(const char *);
char *xasprintf(const char *format, ...) PRINTF_FORMAT(1, 2);