/* [ʞ] src/type.h
 *  ~ lexi hale <lexi@hale.su>
 *  🄯 AGPLv3
 *  ? miscellaneous useful types & macros
 */

#pragma once

#define _strDynSz(a) \
	__builtin_choose_expr( \
			/*   if */ __builtin_types_compatible_p(typeof(a), pstr), \
			/* then */ ((pstr*)&(a))->sz, \
			/* else */ strlen(*(char const**)&(a)))
#define _strDynMem(a) \
	__builtin_choose_expr( \
			/*   if */ __builtin_types_compatible_p(typeof(a), pstr), \
			/* then */ ((pstr*)&(a))->v, \
			/* else */ *(char**)&(a))
#define _pstrOf(a) ((pstr){.v=_strDynMem(a), .sz=_strDynSz(a)})

#define _array(t) struct {t* v; size_t sz;}
typedef _array(char) pstr;

#define _pstrLit(a) ((pstr){.v=(a),.sz=sizeof(a)-1})

#define _drop(x) { \
	if (x.v) { \
		_free (x.v); \
		x.v = nullptr; \
		x.sz = 0; \
	} \
}
#define _new(T, n) ((T){ \
	.v = _alloc( typeof( *((typeof(T)) {}).v ), n), \
	.sz = n, \
})

static inline pstr
pstrDup(pstr p) {
	if (p.v == nullptr) return p;
	if (p.sz == 0) p.sz = strlen(p.v);
	auto n = _new(pstr, p.sz + 1);
	memcpy(n.v, p.v, p.sz);
	n.v[p.sz] = 0;
	n.sz = p.sz;
	return n;
}