shithub: riscv

Download patch

ref: ada1920a0e4787d46402dcdc3e9f3ad3ddae7f0e
parent: 892008af7ca37124d61f3833f800675f6aa77f6b
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Sun Sep 18 06:40:46 EDT 2022

devip: less stupid hnputs_csum()

--- a/sys/src/9/ip/ipaux.c
+++ b/sys/src/9/ip/ipaux.c
@@ -556,16 +556,17 @@
 hnputs_csum(void *p, ushort v, uchar *pcsum)
 {
 	ulong csum;
+	ushort o;
 
+	csum = nhgets(pcsum)^0xFFFF;
+	o = nhgets(p);
+	hnputs(p, v);
 	if(((uchar*)p - pcsum) & 1){
-		hnputs_csum((uchar*)p-1, (nhgets((uchar*)p-1) & 0xFF00) | v>>8, pcsum);
-		hnputs_csum((uchar*)p+1, (nhgets((uchar*)p+1) & 0x00FF) | v<<8, pcsum);
-		return;
+		o = o << 8 | o >> 8;
+		v = v << 8 | v >> 8;
 	}
-	csum = nhgets(pcsum)^0xFFFF;
-	csum += nhgets(p)^0xFFFF;
+	csum += o ^ 0xFFFF;
 	csum += v;
-	hnputs(p, v);
 	while(v = csum >> 16)
 		csum = (csum & 0xFFFF) + v;
 	hnputs(pcsum, csum^0xFFFF);