+
+#define STRV_MAKE(...) ((char**) ((const char*[]) { __VA_ARGS__, NULL }))
+
+#define STRV_MAKE_EMPTY ((char*[1]) { NULL })
+
+#define strv_from_stdarg_alloca(first) \
+ ({ \
+ char **_l; \
+ \
+ if (!first) \
+ _l = (char**) &first; \
+ else { \
+ unsigned _n; \
+ va_list _ap; \
+ \
+ _n = 1; \
+ va_start(_ap, first); \
+ while (va_arg(_ap, char*)) \
+ _n++; \
+ va_end(_ap); \
+ \
+ _l = newa(char*, _n+1); \
+ _l[_n = 0] = (char*) first; \
+ va_start(_ap, first); \
+ for (;;) { \
+ _l[++_n] = va_arg(_ap, char*); \
+ if (!_l[_n]) \
+ break; \
+ } \
+ va_end(_ap); \
+ } \
+ _l; \
+ })
+
+#define STR_IN_SET(x, ...) strv_contains(STRV_MAKE(__VA_ARGS__), x)
+
+#define FOREACH_STRING(x, ...) \
+ for (char **_l = ({ \
+ char **_ll = STRV_MAKE(__VA_ARGS__); \
+ x = _ll ? _ll[0] : NULL; \
+ _ll; \
+ }); \
+ _l && *_l; \
+ x = ({ \
+ _l ++; \
+ _l[0]; \
+ }))