Function compat53_strerror

Libs/sol/sol.hpp:2972–3004

#endif /* Lua File Buffer Size */

static char* compat53_strerror(int en, char* buff, size_t sz) {
#if COMPAT53_HAVE_STRERROR_R
	/* use strerror_r here, because it's available on these specific platforms */
	if (sz > 0) {
		buff[0] = '\0';
		/* we don't care whether the GNU version or the XSI version is used: */
		if (strerror_r(en, buff, sz)) {
			/* Yes, we really DO want to ignore the return value!
			 * GCC makes that extra hard, not even a (void) cast will do. */
		}
		if (buff[0] == '\0') {
			/* Buffer is unchanged, so we probably have called GNU strerror_r which
			 * returned a static constant string. Chances are that strerror will
			 * return the same static constant string and therefore be thread-safe. */
			return strerror(en);
		}
	}
	return buff; /* sz is 0 *or* strerror_r wrote into the buffer */
#elif COMPAT53_HAVE_STRERROR_S
	/* for MSVC and other C11 implementations, use strerror_s since it's
	 * provided by default by the libraries */
	strerror_s(buff, sz, en);
	return buff;
#else
	/* fallback, but strerror is not guaranteed to be threadsafe due to modifying
	 * errno itself and some impls not locking a static buffer for it ... but most
	 * known systems have threadsafe errno: this might only change if the locale
	 * is changed out from under someone while this function is being called */
	(void)buff;
	(void)sz;
	return strerror(en);
#endif
}

COMPAT53_API int lua_absindex(lua_State* L, int i) {
	if (i < 0 && i > LUA_REGISTRYINDEX)