Fix compare bug for tsvector: problem was in aligment. Per Stefan Kaltenbrunner <stefan@kaltenbrunner.cc> and Phil Frost <indigo@bitglue.com>

Author: feodor

contrib/tsearch2/tsvector.c

@@ -966,17 +966,43 @@ silly_cmp_tsvector(const tsvector * a, const tsvector * b)
 		return 1;
 	else
 	{
-		unsigned char *aptr = (unsigned char *) (a->data) + DATAHDRSIZE;
-		unsigned char *bptr = (unsigned char *) (b->data) + DATAHDRSIZE;
+		WordEntry  *aptr = ARRPTR(a);
+		WordEntry  *bptr = ARRPTR(b);
+		int 		i	= 0;
+		int 		res;
+
+
+		for(i=0;i<a->size;i++) {
+			if ( aptr->haspos != bptr->haspos ) {
+				return ( aptr->haspos > bptr->haspos ) ? -1 : 1;
+			} else if ( aptr->pos != bptr->pos ) {
+				return ( aptr->pos > bptr->pos ) ? -1 : 1;
+			} else if ( aptr->len != bptr->len ) {
+				return ( aptr->len > bptr->len ) ? -1 : 1;
+			} else if ( (res=strncmp(STRPTR(a) + aptr->pos, STRPTR(b) + bptr->pos, b->len))!= 0 ) {
+				return res;
+			} else if ( aptr->haspos ) {
+				WordEntryPos	*ap = POSDATAPTR(a, aptr);
+				WordEntryPos	*bp = POSDATAPTR(b, bptr);
+				int				j;
+
+				if ( POSDATALEN(a, aptr) != POSDATALEN(b, bptr) )
+					return ( POSDATALEN(a, aptr) > POSDATALEN(b, bptr) ) ? -1 : 1;
+
+				for(j=0;j<POSDATALEN(a, aptr);j++) {
+					if ( WEP_GETPOS(*ap) != WEP_GETPOS(*bp) ) {
+						return ( WEP_GETPOS(*ap) > WEP_GETPOS(*bp) ) ? -1 : 1;
+					} else if ( WEP_GETWEIGHT(*ap) != WEP_GETWEIGHT(*bp) ) {
+						return ( WEP_GETWEIGHT(*ap) > WEP_GETWEIGHT(*bp) ) ? -1 : 1;
+					}
+					ap++, bp++;
+				}
+			}
 
-		while (aptr - ((unsigned char *) (a->data)) < a->len)
-		{
-			if (*aptr != *bptr)
-				return (*aptr < *bptr) ? -1 : 1;
-			aptr++;
-			bptr++;
+			aptr++; bptr++;
 		}
 	}
+
 	return 0;
 }