Reinstate the fpdecode() SQL function for testing, but only when compiled

with SQLITE_DEBUG.

FossilOrigin-Name: 07eab52e0801bb0e4743b304a06ad16e18cdf8eaa18c0faf8d47a1f5d8576ea0

manifest

@@ -1,5 +1,5 @@
-C Improved\srounding\spolicy.
-D 2023-07-01T17:56:00.664
+C Reinstate\sthe\sfpdecode()\sSQL\sfunction\sfor\stesting,\sbut\sonly\swhen\scompiled\nwith\sSQLITE_DEBUG.
+D 2023-07-01T18:33:26.856
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -590,7 +590,7 @@ F src/delete.c cd5f5cd06ed0b6a882ec1a8c2a0d73b3cecb28479ad19e9931c4706c5e2182be
 F src/expr.c 8d1656b65e26af3e34f78e947ac423f0d20c214ed25a67486e433bf16ca6b543
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c a7fcbf7e66d14dbb73cf49f31489ebf66d0e6006c62b95246924a3bae9f37b36
-F src/func.c 02ad65dea00c07db33df86ad649a81a503ac7b8a259e89d00e7a81e16ae9d2d6
+F src/func.c 6028c160f693bdd018b651b5468a0a8e790f4e01e200796916b2d10a5d3237aa
 F src/global.c bd0892ade7289f6e20bff44c07d06371f2ff9b53cea359e7854b9b72f65adc30
 F src/hash.c 9ee4269fb1d6632a6fecfb9479c93a1f29271bddbbaf215dd60420bcb80c7220
 F src/hash.h 3340ab6e1d13e725571d7cee6d3e3135f0779a7d8e76a9ce0a85971fa3953c51
@@ -633,7 +633,7 @@ F src/pcache1.c 602acb23c471bb8d557a6f0083cc2be641d6cafcafa19e481eba7ef4c9ca0f00
 F src/pragma.c 37b8fb02d090262280c86e1e2654bf59d8dbfbfe8dc6733f2b968a11374c095a
 F src/pragma.h e690a356c18e98414d2e870ea791c1be1545a714ba623719deb63f7f226d8bb7
 F src/prepare.c d6c4354f8ea0dc06962fbabc4b68c4471a45276a2918c929be00f9f537f69eb1
-F src/printf.c 1d2d5ba8c2d6446b89ca4afeeb5e99f8c09ca8cfd6947e33493112771ea7532a
+F src/printf.c 84b7b4b647f336934a5ab2e7f0c52555833cc0778d2d60e016cca52ee8c6cd8f
 F src/random.c 606b00941a1d7dd09c381d3279a058d771f406c5213c9932bbd93d5587be4b9c
 F src/resolve.c 37953a5f36c60bea413c3c04efcd433b6177009f508ef2ace0494728912fe2e9
 F src/rowset.c 8432130e6c344b3401a8874c3cb49fefe6873fec593294de077afea2dce5ec97
@@ -2041,8 +2041,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 76ab8ae809a47a66688e2d50c20dc87ce946d82e9ffebb3adda55c451fad07fc
-R bac28918fe04cf4bb6c5ec2b0ffa1827
+P 6f1122e942b8269552daaf13d647d200d8546ec25f36310d67037c6b58d09976
+R eef1ed887e702bb26e5ed7046220e6a0
 U drh
-Z 6ffcf546adee0eb6c01fe1a8fc34f949
+Z 09a504821196951b22da7c1db783401d
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-6f1122e942b8269552daaf13d647d200d8546ec25f36310d67037c6b58d09976
+07eab52e0801bb0e4743b304a06ad16e18cdf8eaa18c0faf8d47a1f5d8576ea0

src/func.c

@@ -2371,6 +2371,37 @@ static void signFunc(
   sqlite3_result_int(context, x<0.0 ? -1 : x>0.0 ? +1 : 0);
 }
 
+#ifdef SQLITE_DEBUG
+/*
+** Implementation of fpdecode(x,y,z) function.
+**
+** x is a real number that is to be decoded.  y is the precision.
+** z is the maximum real precision.
+*/
+static void fpdecodeFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  FpDecode s;
+  double x;
+  int y, z;
+  char zBuf[100];
+  UNUSED_PARAMETER(argc);
+  assert( argc==3 );
+  x = sqlite3_value_double(argv[0]);
+  y = sqlite3_value_int(argv[1]);
+  z = sqlite3_value_int(argv[2]);
+  sqlite3FpDecode(&s, x, y, z);
+  if( s.isSpecial==2 ){
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "NaN");
+  }else{
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "%c%.*s/%d", s.sign, s.n, s.z, s.iDP);
+  }
+  sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
+}
+#endif /* SQLITE_DEBUG */
+
 /*
 ** All of the FuncDef structures in the aBuiltinFunc[] array above
 ** to the global function hash table.  This occurs at start-time (as
@@ -2442,6 +2473,9 @@ void sqlite3RegisterBuiltinFunctions(void){
     FUNCTION(unicode,            1, 0, 0, unicodeFunc      ),
     FUNCTION(char,              -1, 0, 0, charFunc         ),
     FUNCTION(abs,                1, 0, 0, absFunc          ),
+#ifdef SQLITE_DEBUG
+    FUNCTION(fpdecode,           3, 0, 0, fpdecodeFunc     ),
+#endif
 #ifndef SQLITE_OMIT_FLOATING_POINT
     FUNCTION(round,              1, 0, 0, roundFunc        ),
     FUNCTION(round,              2, 0, 0, roundFunc        ),

src/printf.c

@@ -202,7 +202,6 @@ void sqlite3_str_vappendf(
   int nOut;                  /* Size of the rendering buffer */
   char *zExtra = 0;          /* Malloced memory used by some conversion */
   int exp, e2;               /* exponent of real numbers */
-  int j;                     /* Number of significant digits returned */
   etByte flag_dp;            /* True if decimal point should be shown */
   etByte flag_rtz;           /* True if trailing zeros should be removed */
 
@@ -483,6 +482,7 @@ void sqlite3_str_vappendf(
       case etGENERIC: {
         FpDecode s;
         int iRound;
+        int j;
 
         if( bArgList ){
           realvalue = getDoubleArg(pArgList);