Prevent negative values of SQLITE_DEFAULT_CACHE_SIZE from making SQLITE_WIN32_HEAP_INIT_SIZE negative.

FossilOrigin-Name: e0737f5236ed3e85bd03203c880ee41b34619137

manifest

@@ -1,5 +1,5 @@
-C Larger\smargins\sfor\sone\smemsubsys1\srange\scheck\swhen\srunning\swith\sa\nnon-zero\sreserved-bytes\svalue.
-D 2016-03-24T15:32:19.097
+C Prevent\snegative\svalues\sof\sSQLITE_DEFAULT_CACHE_SIZE\sfrom\smaking\sSQLITE_WIN32_HEAP_INIT_SIZE\snegative.
+D 2016-03-24T20:36:47.715
 F Makefile.in f53429fb2f313c099283659d0df6f20f932c861f
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc df0bf9ff7f8b3f4dd9fb4cc43f92fe58f6ec5c66
@@ -338,7 +338,7 @@ F src/os.h 91ff889115ecd01f436d3611f7f5ea4dc12d92f1
 F src/os_common.h b2f4707a603e36811d9b1a13278bffd757857b85
 F src/os_setup.h c9d4553b5aaa6f73391448b265b89bed0b890faa
 F src/os_unix.c b1ccb273771f41dbdbe0ba7c1ad63c38ad5972ec
-F src/os_win.c 17493f12b0b023c2d5a349b6860009f0d45e08d6
+F src/os_win.c 7c071f7f8f04827ab25a8f441080832be58688e9
 F src/os_win.h eb7a47aa17b26b77eb97e4823f20a00b8bda12ca
 F src/pager.c 38718a019ca762ba4f6795425d5a54db70d1790d
 F src/pager.h e1d38a2f14849e219df0f91f8323504d134c8a56
@@ -1459,7 +1459,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P f4d234b5013bf93b6eac7f8be6d4c074cf9f5293
-R 918e030f39e9a5a455482186d2119a1e
-U drh
-Z 4c4813ba0d5bb38b250579ca5f32f159
+P 6db1d1fbc6c1acc896fa635dfdc5564800502c40
+R 5e26e94cafc58d6fd55eccc4e6c637ee
+U mistachkin
+Z 1088b9c27d83d36a2ae2a2fd6824e14f

manifest.uuid

@@ -1 +1 @@
-6db1d1fbc6c1acc896fa635dfdc5564800502c40
+e0737f5236ed3e85bd03203c880ee41b34619137

src/os_win.c

@@ -344,11 +344,23 @@ struct winFile {
 #  define SQLITE_WIN32_HEAP_CREATE    (TRUE)
 #endif
 
+/*
+ * This is cache size used in the calculation of the initial size of the
+ * Win32-specific heap.  It cannot be negative.
+ */
+#ifndef SQLITE_WIN32_CACHE_SIZE
+#  if SQLITE_DEFAULT_CACHE_SIZE>=0
+#    define SQLITE_WIN32_CACHE_SIZE (SQLITE_DEFAULT_CACHE_SIZE)
+#  else
+#    define SQLITE_WIN32_CACHE_SIZE (-(SQLITE_DEFAULT_CACHE_SIZE))
+#  endif
+#endif
+
 /*
  * The initial size of the Win32-specific heap.  This value may be zero.
  */
 #ifndef SQLITE_WIN32_HEAP_INIT_SIZE
-#  define SQLITE_WIN32_HEAP_INIT_SIZE ((SQLITE_DEFAULT_CACHE_SIZE) * \
+#  define SQLITE_WIN32_HEAP_INIT_SIZE ((SQLITE_WIN32_CACHE_SIZE) * \
                                        (SQLITE_DEFAULT_PAGE_SIZE) + 4194304)
 #endif