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libip: sync with 9front

--- a/include/ip.h

+++ b/include/ip.h

@@ -10,9 +10,9 @@

 int	eipfmt(Fmt*);

 int	isv4(uchar*);

 vlong	parseip(uchar*, char*);

-vlong	parseipmask(uchar*, char*);

+vlong	parseipmask(uchar*, char*, int);

+vlong	parseipandmask(uchar*, uchar*, char*, char*);

 char*	v4parseip(uchar*, char*);

-char*	v4parsecidr(uchar*, uchar*, char*);

 void	hnputv(void*, uvlong);

 void	hnputl(void*, uint);

--- a/libip/parseip.c

+++ b/libip/parseip.c

@@ -112,7 +112,7 @@

 	}

 	if(v4){

 		to[10] = to[11] = 0xff;

-		return nhgetl(to + IPv4off);

+		return (ulong)nhgetl(to + IPv4off);

 	} else

 		return 6;

 }

@@ -122,10 +122,10 @@

  *  style

  */

 vlong

-parseipmask(uchar *to, char *from)

+parseipmask(uchar *to, char *from, int v4)

 {

-	int i, w;

 	vlong x;

+	int i, w;

 	uchar *p;

 	if(*from == '/'){

@@ -133,6 +133,8 @@

 		i = atoi(from+1);

 		if(i < 0)

 			i = 0;

+		if(i <= 32 && v4)

+			i += 96;

 		if(i > 128)

 			i = 128;

 		w = i;

@@ -141,48 +143,34 @@

 			*p++ = 0xff;

 		if(i > 0)

 			*p = ~((1<<(8-i))-1);

-		x = nhgetl(to+IPv4off);

 		/*

 		 * identify as ipv6 if the mask is inexpressible as a v4 mask

 		 * (because it has too few mask bits).  Arguably, we could

 		 * always return 6 here.

 		 */

-		if (w < 8*(IPaddrlen-IPv4addrlen))

-			return 6;

+		if (w < 96)

+			return v4 ? -1 : 6;

+		x = (ulong)nhgetl(to+IPv4off);

 	} else {

 		/* as a straight v4 bit mask */

 		x = parseip(to, from);

-		if (x != -1)

-			x = (ulong)nhgetl(to + IPv4off);

 		if(memcmp(to, v4prefix, IPv4off) == 0)

 			memset(to, 0xff, IPv4off);

+		else if(v4)

+			x = -1;

 	}

 	return x;

 }

-/*

- *  parse a v4 ip address/mask in cidr format

- */

-char*

-v4parsecidr(uchar *addr, uchar *mask, char *from)

+vlong

+parseipandmask(uchar *ip, uchar *mask, char *ipstr, char *maskstr)

 {

-	int i;

-	char *p;

-	uchar *a;

+	vlong x;

-	p = v4parseip(addr, from);

-

-	if(*p == '/'){

-		/* as a number of prefix bits */

-		i = strtoul(p+1, &p, 0);

-		if(i > 32)

-			i = 32;

-		memset(mask, 0, IPv4addrlen);

-		for(a = mask; i >= 8; i -= 8)

-			*a++ = 0xff;

-		if(i > 0)

-			*a = ~((1<<(8-i))-1);

-	} else 

-		memcpy(mask, defmask(addr), IPv4addrlen);

-	return p;

+	x = parseip(ip, ipstr);

+	if(maskstr == nil)

+		memset(mask, 0xff, IPaddrlen);

+	else if(parseipmask(mask, maskstr, memcmp(ip, v4prefix, IPv4off) == 0) == -1)

+		x = -1;

+	return x;

 }