Changes to geopoly to silience false-positive warnings coming out of clang.

FossilOrigin-Name: 11d9015f31d1ea2fd27174d4ceea08a145fdbb92a175bec0aae4b90f991694bc

ext/rtree/geopoly.c

@@ -106,14 +106,24 @@ typedef float GeoCoord;
 **
 **      encoding    (1 byte)   0=big-endian, 1=little-endian
 **      nvertex     (3 bytes)  Number of vertexes as a big-endian integer
+**
+** Enough space is allocated for 4 coordinates, to work around over-zealous
+** warnings coming from some compiler (notably, clang). In reality, the size
+** of each GeoPoly memory allocate is adjusted as necessary so that the
+** GeoPoly.a[] array at the end is the appropriate size.
 */
 typedef struct GeoPoly GeoPoly;
 struct GeoPoly {
   int nVertex;          /* Number of vertexes */
   unsigned char hdr[4]; /* Header for on-disk representation */
-  GeoCoord a[2];    /* 2*nVertex values. X (longitude) first, then Y */
+  GeoCoord a[8];        /* 2*nVertex values. X (longitude) first, then Y */
 };
 
+/* The size of a memory allocation needed for a GeoPoly object sufficient
+** to hold N coordinate pairs.
+*/
+#define GEOPOLY_SZ(N)  (sizeof(GeoPoly) + sizeof(GeoCoord)*2*((N)-4))
+
 /*
 ** State of a parse of a GeoJSON input.
 */
@@ -248,12 +258,10 @@ static GeoPoly *geopolyParseJson(const unsigned char *z, int *pRc){
      && s.a[1]==s.a[s.nVertex*2-1]
      && (s.z++, geopolySkipSpace(&s)==0)
     ){
-      int nByte;
       GeoPoly *pOut;
       int x = 1;
       s.nVertex--;  /* Remove the redundant vertex at the end */
-      nByte = sizeof(GeoPoly) * s.nVertex*2*sizeof(GeoCoord);
-      pOut = sqlite3_malloc64( nByte );
+      pOut = sqlite3_malloc64( GEOPOLY_SZ(s.nVertex) );
       x = 1;
       if( pOut==0 ) goto parse_json_err;
       pOut->nVertex = s.nVertex;
@@ -588,7 +596,7 @@ static GeoPoly *geopolyBBox(
     if( pRc ) *pRc = SQLITE_OK;
     if( aCoord==0 ){
       geopolyBboxFill:
-      pOut = sqlite3_realloc(p, sizeof(GeoPoly)+sizeof(GeoCoord)*6);
+      pOut = sqlite3_realloc(p, GEOPOLY_SZ(4));
       if( pOut==0 ){
         sqlite3_free(p);
         if( context ) sqlite3_result_error_nomem(context);

manifest

@@ -1,5 +1,5 @@
-C Add\san\sALWAYS\son\san\sunreachable\sbranch\sin\sthe\sALTER\sTABLE\slogic.
-D 2018-10-03T18:05:36.483
+C Changes\sto\sgeopoly\sto\ssilience\sfalse-positive\swarnings\scoming\sout\sof\sclang.
+D 2018-10-05T15:10:00.337
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in 01e95208a78b57d056131382c493c963518f36da4c42b12a97eb324401b3a334
@@ -361,7 +361,7 @@ F ext/repair/test/checkfreelist01.test 3e8aa6aeb4007680c94a8d07b41c339aa635cc782
 F ext/repair/test/checkindex01.test 6945d0ffc0c1dc993b2ce88036b26e0f5d6fcc65da70fc9df27c2647bb358b0f
 F ext/repair/test/test.tcl 686d76d888dffd021f64260abf29a55c57b2cedfa7fc69150b42b1d6119aac3c
 F ext/rtree/README 6315c0d73ebf0ec40dedb5aa0e942bc8b54e3761
-F ext/rtree/geopoly.c cdf7972736f6c60e4309debad504de52ccd2dbe29e02bc8afc7912923ee68059
+F ext/rtree/geopoly.c 04db01e24dca675c5ab75110709aed054325f7474b2f567dd98361c373dcff3c
 F ext/rtree/rtree.c 6cc2e673cf1e9ea1619f13ab990f12389dfb951b131acbc2fbe164cee8992a20
 F ext/rtree/rtree.h 4a690463901cb5e6127cf05eb8e642f127012fd5003830dbc974eca5802d9412
 F ext/rtree/rtree1.test 309afc04d4287542b2cd74f933296832cc681c7b014d9405cb329b62053a5349
@@ -1770,7 +1770,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
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-P bf0a6634cd8f9457992b8da522a6775a304156815bf6f4f64f96016356baa870
-R 3bd57e9abfbbe1b0866f4f1caa5677e9
+P ebcd4523171f0988ff08e2bf36fb8a0caa40efe7ac7556b4eb206784969b03e4
+R 0343e4736757244e342124d3ae0b6945
 U drh
-Z 12be36416a19f9505215ac2168bb7434
+Z 37c34aea8b9ce101934311a6217c0cb6

manifest.uuid

@@ -1 +1 @@
-ebcd4523171f0988ff08e2bf36fb8a0caa40efe7ac7556b4eb206784969b03e4
+11d9015f31d1ea2fd27174d4ceea08a145fdbb92a175bec0aae4b90f991694bc