Make sure the array of overloadable system calls is always correctly

sized, regardless of the compile-time configuration.
Ticket [bb3a86e890c8e96ab].

FossilOrigin-Name: c6e727ab3b16e71b0151673bb24b0bafec368ee6

1 files changed, 7 insertions, 1 deletions

diff --git a/src/os_unix.c b/src/os_unix.c
index f0e8258f1..744d85776 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -365,8 +365,10 @@ static struct unix_syscall {
 
 #if SQLITE_ENABLE_LOCKING_STYLE
   { "fchmod",       (sqlite3_syscall_ptr)fchmod,     0  },
-#define osFchmod    ((int(*)(int,mode_t))aSyscall[14].pCurrent)
+#else
+  { "fchmod",       (sqlite3_syscall_ptr)0,          0  },
 #endif
+#define osFchmod    ((int(*)(int,mode_t))aSyscall[14].pCurrent)
 
 #if defined(HAVE_POSIX_FALLOCATE) && HAVE_POSIX_FALLOCATE
   { "fallocate",    (sqlite3_syscall_ptr)posix_fallocate,  0 },
@@ -6684,6 +6686,10 @@ int sqlite3_os_init(void){
   };
   unsigned int i;          /* Loop counter */
 
+  /* Double-check that the aSyscall[] array has been constructed
+  ** correctly.  See ticket [bb3a86e890c8e96ab] */
+  assert( ArraySize(aSyscall)==16 );
+
   /* Register all VFSes defined in the aVfs[] array */
   for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
     sqlite3_vfs_register(&aVfs[i], i==0);