enhanced qse_addtime() and qse_subtime() to detect overflow/underflow

changed qse_mbsntonwad()/qse_wcsntonwad() to accept a unix path beginning with a slash.
changed the nwad to string conversion function to not append @ if a unix socket address begins with a slash

qse/include/qse/cmn/time.h

@@ -93,7 +93,7 @@
 #define QSE_SEC_TO_USEC(sec) ((sec) * QSE_USECS_PER_SEC)
 #define QSE_USEC_TO_SEC(usec) ((usec) / QSE_USECS_PER_SEC)
 
-typedef qse_long_t qse_ntime_sec_t;
+typedef qse_int64_t qse_ntime_sec_t;
 typedef qse_int32_t qse_ntime_nsec_t;
 
 /**

qse/lib/cmn/time.c

@@ -619,14 +619,64 @@ void qse_addtime (const qse_ntime_t* x, const qse_ntime_t* y, qse_ntime_t* z)
 	QSE_ASSERT (x->nsec >= 0 && x->nsec < QSE_NSECS_PER_SEC);
 	QSE_ASSERT (y->nsec >= 0 && y->nsec < QSE_NSECS_PER_SEC);
 
+#if 0
 	z->sec = x->sec + y->sec;
 	z->nsec = x->nsec + y->nsec;
 
-	if (z->nsec >= QSE_NSECS_PER_SEC)
+	while (z->nsec >= QSE_NSECS_PER_SEC)
 	{
 		z->sec = z->sec + 1;
 		z->nsec = z->nsec - QSE_NSECS_PER_SEC;
 	}
+#else
+	qse_ntime_sec_t xs, ys;
+	qse_ntime_nsec_t ns;
+
+	ns = x->nsec + y->nsec;
+	if (ns >= QSE_NSECS_PER_SEC)
+	{
+		ns = ns - QSE_NSECS_PER_SEC;
+		if (x->sec == QSE_TYPE_MAX(qse_ntime_sec_t))
+		{
+			if (y->sec >= 0) goto overflow;
+			xs = x->sec;
+			ys = y->sec + 1; /* this won't overflow */
+		}
+		else
+		{
+			xs = x->sec + 1; /* this won't overflow */
+			ys = y->sec;
+		}
+	}
+	else
+	{
+		xs = x->sec;
+		ys = y->sec;
+	}
+
+	if ((ys >= 1 && xs > QSE_TYPE_MAX(qse_ntime_sec_t) - ys) ||
+	    (ys <= -1 && xs < QSE_TYPE_MIN(qse_ntime_sec_t) - ys))
+	{
+		if (xs >= 0)
+		{
+		overflow:
+			xs = QSE_TYPE_MAX(qse_ntime_sec_t);
+			ns = QSE_NSECS_PER_SEC - 1;
+		}
+		else
+		{
+			xs = QSE_TYPE_MIN(qse_ntime_sec_t);
+			ns = 0;
+		}
+	}
+	else
+	{
+		xs = xs + ys;
+	}
+
+	z->sec = xs;
+	z->nsec = ns;
+#endif
 }
 
 void qse_subtime (const qse_ntime_t* x, const qse_ntime_t* y, qse_ntime_t* z)
@@ -634,17 +684,65 @@ void qse_subtime (const qse_ntime_t* x, const qse_ntime_t* y, qse_ntime_t* z)
 	QSE_ASSERT (x->nsec >= 0 && x->nsec < QSE_NSECS_PER_SEC);
 	QSE_ASSERT (y->nsec >= 0 && y->nsec < QSE_NSECS_PER_SEC);
 
+#if 0
 	z->sec = x->sec - y->sec;
 	z->nsec = x->nsec - y->nsec;
 
-	if (z->nsec < 0)
+	while (z->nsec < 0)
 	{
 		z->sec = z->sec - 1;
 		z->nsec = z->nsec + QSE_NSECS_PER_SEC;
 	}
+#else
+	qse_ntime_sec_t xs, ys;
+	qse_ntime_nsec_t ns;
+
+	ns = x->nsec - y->nsec;
+	if (ns < 0)
+	{
+		ns = ns + QSE_NSECS_PER_SEC;
+		if (x->sec == QSE_TYPE_MIN(qse_ntime_sec_t))
+		{
+			if (y->sec <= 0) goto underflow;
+			xs = x->sec;
+			ys = y->sec - 1; /* this won't underflow */
+		}
+		else
+		{
+			xs = x->sec - 1; /* this won't underflow */
+			ys = y->sec;
+		}
+	}
+	else
+	{
+		xs = x->sec;
+		ys = y->sec;
 	}
 
+	if ((ys >= 1 && xs < QSE_TYPE_MIN(qse_ntime_sec_t) + ys) ||
+	    (ys <= -1 && xs > QSE_TYPE_MAX(qse_ntime_sec_t) + ys))
+	{
+		if (xs >= 0)
+		{
+			xs = QSE_TYPE_MAX(qse_ntime_sec_t);
+			ns = QSE_NSECS_PER_SEC - 1;
+		}
+		else
+		{
+		underflow:
+			xs = QSE_TYPE_MIN(qse_ntime_sec_t);
+			ns = 0;
+		}
+	} 
+	else
+	{
+		xs = xs - ys;
+	}
 
+	z->sec = xs;
+	z->nsec = ns;
+#endif
+}
 
 int qse_mbs_to_ntime (const qse_mchar_t* text, qse_ntime_t* ntime)
 {

qse/lib/si/Socket.cpp

@@ -356,13 +356,14 @@ int Socket::finiConnectNB () QSE_CPP_NOEXCEPT
 {
 	QSE_ASSERT (qse_is_sck_valid(this->handle));
 
-	if (qse_fini_sck_conn(this->handle) <= -1)
+	int n;
+	if ((n = qse_fini_sck_conn(this->handle)) <= -1)
 	{
 		this->setErrorFmt (syserr_to_errnum(errno), QSE_T("%hs"), strerror(errno));
 		return -1;
 	}
 
-	return 0;
+	return n;
 }
 
 
@@ -522,6 +523,7 @@ int Socket::accept (Socket* newsck, SocketAddress* newaddr, int traits) QSE_CPP_
 
 accept_done:
 	newsck->handle = newfd;
+	newsck->domain = this->domain; // the new socket inherits the listener's domain.
 	return 0;
 }
 

qse/lib/si/SocketAddress.cpp

@@ -289,7 +289,7 @@ int SocketAddress::set (const qse_wchar_t* str, qse_size_t len) QSE_CPP_NOEXCEPT
 /* 
  * NOTICE: 
  *   When host is "", the address is resolved to localhost.
- *   When host is XP_NULL, the address is resolved to INADDR_ANY 
+ *   When host is QSE_NULL, the address is resolved to INADDR_ANY 
  *   or IN6ADDR_ANY_INIT depending on the address family.
  */
 int SocketAddress::resolve (const qse_mchar_t* service, const qse_mchar_t* host, int family, int type) QSE_CPP_NOEXCEPT
@@ -354,6 +354,7 @@ int SocketAddress::resolve (const qse_wchar_t* service, const qse_wchar_t* host,
 		if (qse_wcstombs(service, &wcslen, mb_service, &mbslen) <= -1) return -1;
 		p_service = mb_service;
 	}
+
 	x = ::getaddrinfo(p_host, p_service, &hints, &info);	
 	if (x != 0) return -1;
 	

qse/lib/si/nwad.c

@@ -135,15 +135,16 @@ int qse_mbsntonwad (const qse_mchar_t* str, qse_size_t len, qse_nwad_t* nwad)
 
 	if (p >= end) return -1;
 
-	if (*p == QSE_MT('@') && len >= 2)
+	if ((*p == '@' && len >= 2) || *p == '/') // with @, you can specify a relative path
 	{
-		/* the string begins with @. it's a local name */
+		/* the string begins with @. it's a local name excluding @.
+		 * if it begins with /, it's also a local name */
 	#if defined(QSE_CHAR_IS_MCHAR)
-		qse_mbsxncpy (tmpad.u.local.path, QSE_COUNTOF(tmpad.u.local.path), p + 1, len - 1);
+		qse_mbsxncpy (tmpad.u.local.path, QSE_COUNTOF(tmpad.u.local.path), p + (*p == '@'), len - (*p == '@'));
 	#else
-		qse_size_t mbslen = len - 1;
+		qse_size_t mbslen = len - (*p == '@');
 		qse_size_t wcslen = QSE_COUNTOF(tmpad.u.local.path) - 1;
-		if (qse_mbsntowcsn (p + 1, &mbslen, tmpad.u.local.path, &wcslen) <= -1) return -1;
+		if (qse_mbsntowcsn(p + (*p == '@'), &mbslen, tmpad.u.local.path, &wcslen) <= -1) return -1;
 		tmpad.u.local.path[wcslen] = QSE_WT('\0');
 	#endif
 
@@ -317,16 +318,17 @@ int qse_wcsntonwad (const qse_wchar_t* str, qse_size_t len, qse_nwad_t* nwad)
 
 	if (p >= end) return -1;
 
-	if (*p == QSE_WT('@') && len >= 2)
+	if ((*p == '@' && len >= 2) || *p == '/') // with @, you can specify a relative path
 	{
-		/* the string begins with @. it's a local name */
+		/* the string begins with @. it's a local name excluding @.
+		 * if it begins with /, it's also a local name */
 	#if defined(QSE_CHAR_IS_MCHAR)
 		qse_size_t wcslen = len - 1;
-		qse_size_t mbslen = QSE_COUNTOF(tmpad.u.local.path) - 1;
+		qse_size_t mbslen = QSE_COUNTOF(tmpad.u.local.path) - (*p == '@');
-		if (qse_wcsntombsn (p + 1, &wcslen, tmpad.u.local.path, &mbslen) <= -1) return -1;
+		if (qse_wcsntombsn(p + (*p == '@'), &wcslen, tmpad.u.local.path, &mbslen) <= -1) return -1;
 		tmpad.u.local.path[mbslen] = QSE_MT('\0');
 	#else
-		qse_wcsxncpy (tmpad.u.local.path, QSE_COUNTOF(tmpad.u.local.path), p + 1, len - 1);
+		qse_wcsxncpy (tmpad.u.local.path, QSE_COUNTOF(tmpad.u.local.path), p + (*p == '@'), len - (*p == '@'));
 	#endif
 
 		tmpad.type = QSE_NWAD_LOCAL;
@@ -582,9 +584,12 @@ qse_size_t qse_nwadtombs (
 
 		case QSE_NWAD_LOCAL:
 			if (flags & QSE_NWADTOMBS_ADDR)
+			{
+				if (nwad->u.local.path[0] != '/')
 				{
 					if (xlen + 1 >= len) goto done;
-				buf[xlen++] = QSE_MT('@');
+					buf[xlen++] = '@';
+				}
 
 			#if defined(QSE_CHAR_IS_MCHAR)
 				if (xlen + 1 >= len) goto done;
@@ -711,9 +716,12 @@ qse_size_t qse_nwadtowcs (
 
 		case QSE_NWAD_LOCAL:
 			if (flags & QSE_NWADTOMBS_ADDR)
+			{
+				if (nwad->u.local.path[0] != '/')
 				{
 					if (xlen + 1 >= len) goto done;
-				buf[xlen++] = QSE_WT('@');
+					buf[xlen++] = '@';
+				}
 
 			#if defined(QSE_CHAR_IS_MCHAR)
 				if (xlen + 1 >= len) goto done;