From: t-ishii@sra.co.jp

scrappy · scrappy · commit e4dccfdc6e60 · 1998-03-15T08:09:37.000Z
6.3 postmaster is supposed to work with pre 6.3 protocol. This is true
for little endian architecture servers. But for big endian machines
such as Sparc the backward compatibility function do not work.
Attached are patches to fix the problem.
diff --git a/src/backend/libpq/pqcomprim.c b/src/backend/libpq/pqcomprim.c
@@ -34,12 +34,20 @@
 #else
 #if BYTE_ORDER == BIG_ENDIAN
 
+/*
 #define ntoh_s(n)	(uint16)(((u_char *)&n)[1] << 8 \
 			  | ((u_char *)&n)[0])
 #define ntoh_l(n)	(uint32)(((u_char *)&n)[3] << 24 \
 			  | ((u_char *)&n)[2] << 16 \
 			  | ((u_char *)&n)[1] <<  8 \
 			  | ((u_char *)&n)[0])
+*/
+#define ntoh_s(n)	(uint16)((((uint16)n & 0x00ff) <<  8) | \
+				 (((uint16)n & 0xff00) >>  8))
+#define ntoh_l(n)	(uint32)((((uint32)n & 0x000000ff) << 24) | \
+				 (((uint32)n & 0x0000ff00) <<  8) | \
+				 (((uint32)n & 0x00ff0000) >>  8) | \
+				 (((uint32)n & 0xff000000) >> 24))
 #define hton_s(n)	(ntoh_s(n))
 #define hton_l(n)	(ntoh_l(n))
 
