Fix harmless scan-build warnings.

FossilOrigin-Name: beab3c98639be531744e60440223bb9ee76bc15234aff05e5efb273c8241dfd8

manifest

@@ -1,5 +1,5 @@
-C Omit\sthe\suse\sof\smemmove()\sin\ssqlite3FpDecode()\sin\san\sattempt\sto\savoid\nspurious\swarnings\sfrom\svalgrind.\s\sAlso\smakes\sthe\scode\sslightly\ssmaller\sand\nfaster.
-D 2023-07-07T18:49:08.930
+C Fix\sharmless\sscan-build\swarnings.
+D 2023-07-08T14:27:55.386
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -576,7 +576,7 @@ F src/auth.c 19b7ccacae3dfba23fc6f1d0af68134fa216e9040e53b0681b4715445ea030b4
 F src/backup.c 5c97e8023aab1ce14a42387eb3ae00ba5a0644569e3476f38661fa6f824c3523
 F src/bitvec.c 9eac5f42c11914d5ef00a75605bb205e934f435c579687f985f1f8b0995c8645
 F src/btmutex.c 79a43670447eacc651519a429f6ece9fd638563cf95b469d6891185ddae2b522
-F src/btree.c c0c93b6cb4dc133b528c1290bb4ad0f2414452f9a5758ff2b106af718874f39e
+F src/btree.c c9400cc1509116a29120dc06feb00ca7e26b5a4a6dba80758b1ba109d8fce5a4
 F src/btree.h aa354b9bad4120af71e214666b35132712b8f2ec11869cb2315c52c81fad45cc
 F src/btreeInt.h 3b4eff7155c0cea6971dc51f62e3529934a15a6640ec607dd42a767e379cb3a9
 F src/build.c a8ae3b32d9aa9bbd2c0e97d7c0dd80def9fbca408425de1608f57ee6f47f45f4
@@ -705,7 +705,7 @@ F src/trigger.c ad6ab9452715fa9a8075442e15196022275b414b9141b566af8cdb7a1605f2b0
 F src/update.c 0aa36561167a7c40d01163238c297297962f31a15a8d742216b3c37cdf25f731
 F src/upsert.c 5303dc6c518fa7d4b280ec65170f465c7a70b7ac2b22491598f6d0b4875b3145
 F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
-F src/util.c 672c28c8897a5901e1899b0905edc357addac0af4e7a0c498ab7793bdc9436b9
+F src/util.c c2c4c0d78060bae452b1f332e493868476a1d74a10053dd0a3235ab6f5bbe19d
 F src/vacuum.c 604fcdaebe76f3497c855afcbf91b8fa5046b32de3045bab89cc008d68e40104
 F src/vdbe.c 74282a947234513872a83b0bab1b8c644ece64b3e27b053ef17677c8ff9c81e0
 F src/vdbe.h 41485521f68e9437fdb7ec4a90f9d86ab294e9bb8281e33b235915e29122cfc0
@@ -2043,8 +2043,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P d3532eaed1cc671d8149b1bd34ead2a88fb83502a2898a5f60aea0a7daf18958
-R 4a4400c3c49ba8b871f445cac215bb74
+P b409943af00e35ad05906d0a80ffa1225a66f3d807c131e00cfbf6671a03a981
+R f6d7895f9e1a4f2f157e2c00c74052a3
 U drh
-Z 95723430906d3a88b97575fa5de4826b
+Z 31aaf2b4d0a16e9a02d6a166e7eb62cb
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-b409943af00e35ad05906d0a80ffa1225a66f3d807c131e00cfbf6671a03a981
+beab3c98639be531744e60440223bb9ee76bc15234aff05e5efb273c8241dfd8

src/btree.c

@@ -5341,6 +5341,7 @@ static int moveToChild(BtCursor *pCur, u32 newPgno){
   pCur->ix = 0;
   pCur->iPage++;
   rc = getAndInitPage(pCur->pBt, newPgno, &pCur->pPage, pCur->curPagerFlags);
+  assert( pCur->pPage!=0 || rc!=SQLITE_OK );
   if( rc==SQLITE_OK
    && (pCur->pPage->nCell<1 || pCur->pPage->intKey!=pCur->curIntKey)
   ){
@@ -5569,7 +5570,7 @@ int sqlite3BtreeFirst(BtCursor *pCur, int *pRes){
     *pRes = 0;
     rc = moveToLeftmost(pCur);
   }else if( rc==SQLITE_EMPTY ){
-    assert( pCur->pgnoRoot==0 || pCur->pPage->nCell==0 );
+    assert( pCur->pgnoRoot==0 || (pCur->pPage!=0 && pCur->pPage->nCell==0) );
     *pRes = 1;
     rc = SQLITE_OK;
   }

src/util.c

@@ -933,6 +933,11 @@ int sqlite3Atoi(const char *z){
 ** n is positive.  Or round to -n signficant digits after the
 ** decimal point if n is negative.  No rounding is performed if
 ** n is zero.
+**
+** The significant digits of the decimal representation are
+** stored in p->z[] which is a often (but not always) a pointer
+** into the middle of p->zBuf[].  There are p->n significant digits.
+** The p->z[] array is *not* zero-terminated.
 */
 void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
   int i;
@@ -1025,14 +1030,16 @@ void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
 
   /* Extract significant digits. */
   i = sizeof(p->zBuf)-1;
+  assert( v>0 );
   while( v ){  p->zBuf[i--] = (v%10) + '0'; v /= 10; }
-  assert( i>=0 );
+  assert( i>=0 && i<sizeof(p->zBuf)-1 );
   p->n = sizeof(p->zBuf) - 1 - i;
+  assert( p->n>0 );
   assert( p->n<sizeof(p->zBuf) );
   p->iDP = p->n + exp;
   if( iRound<0 ){
     iRound = p->iDP - iRound;
-    if( iRound==0 && p->z[i+1]>='5' ){
+    if( iRound==0 && p->zBuf[i+1]>='5' ){
       iRound = 1;
       p->zBuf[i--] = '0';
       p->n++;
@@ -1061,6 +1068,7 @@ void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
     }
   }
   p->z = &p->zBuf[i+1];
+  assert( i+p->n < sizeof(p->zBuf) );
   while( ALWAYS(p->n>0) && p->z[p->n-1]=='0' ){ p->n--; }
 }