Fix the comment display for the OP_Function opcode. And at the same time,

improve the comment generating logic to make use of the newer
sqlite3_str_appendf() interface.

FossilOrigin-Name: 4248980a356f659b10b12c778592996d53c91fae4ea50c8566678da176bdd152

manifest

@@ -1,5 +1,5 @@
-C Merge\sthe\ssqlite3CodecQueryParameters()\sfix\sinto\strunk.
+C Fix\sthe\scomment\sdisplay\sfor\sthe\sOP_Function\sopcode.\s\sAnd\sat\sthe\ssame\stime,\nimprove\sthe\scomment\sgenerating\slogic\sto\smake\suse\sof\sthe\snewer\nsqlite3_str_appendf()\sinterface.
-D 2020-02-01T14:20:35.510
+D 2020-02-01T17:38:24.757
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -603,11 +603,11 @@ F src/upsert.c 2920de71b20f04fe25eb00b655d086f0ba60ea133c59d7fa3325c49838818e78
 F src/utf.c 736ff76753236ffbc8b5b939f5e0607f28aeaa7c780b3a56b419228f0a81c87b
 F src/util.c d035b09df9cecbc0e8f07c34b815acbf0d43c8adc8d2c540e3dc92eecb27855a
 F src/vacuum.c 82dcec9e7b1afa980288718ad11bc499651c722d7b9f32933c4d694d91cb6ebf
-F src/vdbe.c e3dd230ece613409507523e68436764cc20638bb77ba2f416097de5b37235ce1
+F src/vdbe.c 9a3bf7470aab17c64a5470f16bbd989bfdd54861dc1ee2476fd069db91631b2a
 F src/vdbe.h defd693289c7bb8d325f109be9490c77138061211a116827da7244b6015a4934
 F src/vdbeInt.h 30d3e8b991547cdf39025e416a0a737b0416d46747af70ae058f60e2e0466fe7
 F src/vdbeapi.c 1252d80c548711e47a6d84dae88ed4e95d3fbb4e7bd0eaa1347299af7efddf02
-F src/vdbeaux.c 4c5788121f0818f33489dc81ebfd688311aa6388c3279e9373a941ada1b491d8
+F src/vdbeaux.c 72a47b6beca06811144ddf370e2327fc9628243eab69f09cc5ace4d19b39e208
 F src/vdbeblob.c 253ed82894924c362a7fa3079551d3554cd1cdace39aa833da77d3bc67e7c1b1
 F src/vdbemem.c 6200af702c87105d5b00d8ac5f5fa2c6d8f796aa974dbe2d15dcd95379ba1fa7
 F src/vdbesort.c 2be76d26998ce2b3324cdcc9f6443728e54b6c7677c553ad909c7d7cfab587df
@@ -1858,7 +1858,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P b5a66d10f4bbaf10def7b50b9ed98b05b41bb2c2af5ab9a90f6cda61169ab123 cc65ca541265bd7061ed8f5ec9a54f3c384c41019c5ea1c68dcaabeff3495839
+P a812f533693a3605f297199ae0320d663e872208675e86860c5c1803943943aa
-R 38e4d50870b636b26dd03f2e2c8fedf3
+R 8e8f5a4f3995927880e2f9313ea17c79
 U drh
-Z 53e4c409bce656a6e52d30f174d1ac30
+Z f948c772d5a7abb99b2764402327f3c7

manifest.uuid

@@ -1 +1 @@
-a812f533693a3605f297199ae0320d663e872208675e86860c5c1803943943aa
+4248980a356f659b10b12c778592996d53c91fae4ea50c8566678da176bdd152

src/vdbe.c

@@ -7574,7 +7574,7 @@ case OP_MaxPgcnt: {            /* out2 */
 #endif
 
 /* Opcode: Function P1 P2 P3 P4 *
-** Synopsis: r[P3]=func(r[P2@P5])
+** Synopsis: r[P3]=func(r[P2@NP])
 **
 ** Invoke a user function (P4 is a pointer to an sqlite3_context object that
 ** contains a pointer to the function to be run) with arguments taken
@@ -7593,7 +7593,7 @@ case OP_MaxPgcnt: {            /* out2 */
 ** See also: AggStep, AggFinal, PureFunc
 */
 /* Opcode: PureFunc P1 P2 P3 P4 *
-** Synopsis: r[P3]=func(r[P2@P5])
+** Synopsis: r[P3]=func(r[P2@NP])
 **
 ** Invoke a user function (P4 is a pointer to an sqlite3_context object that
 ** contains a pointer to the function to be run) with arguments taken

src/vdbeaux.c

@@ -1445,8 +1445,11 @@ static int displayComment(
   const char *zOpName;
   const char *zSynopsis;
   int nOpName;
-  int ii, jj;
+  int ii;
   char zAlt[50];
+  StrAccum x;
+  sqlite3StrAccumInit(&x, 0, zTemp, nTemp, 0);
+
   zOpName = sqlite3OpcodeName(pOp->opcode);
   nOpName = sqlite3Strlen30(zOpName);
   if( zOpName[nOpName+1] ){
@@ -1461,51 +1464,61 @@ static int displayComment(
       }
       zSynopsis = zAlt;
     }
-    for(ii=jj=0; jj<nTemp-1 && (c = zSynopsis[ii])!=0; ii++){
+    for(ii=0; (c = zSynopsis[ii])!=0; ii++){
       if( c=='P' ){
         c = zSynopsis[++ii];
         if( c=='4' ){
-          sqlite3_snprintf(nTemp-jj, zTemp+jj, "%s", zP4);
+          sqlite3_str_appendall(&x, zP4);
         }else if( c=='X' ){
-          sqlite3_snprintf(nTemp-jj, zTemp+jj, "%s", pOp->zComment);
+          sqlite3_str_appendall(&x, pOp->zComment);
           seenCom = 1;
         }else{
           int v1 = translateP(c, pOp);
           int v2;
-          sqlite3_snprintf(nTemp-jj, zTemp+jj, "%d", v1);
           if( strncmp(zSynopsis+ii+1, "@P", 2)==0 ){
             ii += 3;
-            jj += sqlite3Strlen30(zTemp+jj);
             v2 = translateP(zSynopsis[ii], pOp);
             if( strncmp(zSynopsis+ii+1,"+1",2)==0 ){
               ii += 2;
               v2++;
             }
-            if( v2>1 ){
+            if( v2<2 ){
-              sqlite3_snprintf(nTemp-jj, zTemp+jj, "..%d", v1+v2-1);
+              sqlite3_str_appendf(&x, "%d", v1);
+            }else{
+              sqlite3_str_appendf(&x, "%d..%d", v1, v1+v2-1);
+            }
+          }else if( strncmp(zSynopsis+ii+1, "@NP", 3)==0 ){
+            sqlite3_context *pCtx = pOp->p4.pCtx;
+            assert( pOp->p4type==P4_FUNCCTX );
+            if( pCtx->argc==1 ){
+              sqlite3_str_appendf(&x, "%d", v1);
+            }else if( pCtx->argc>1 ){
+              sqlite3_str_appendf(&x, "%d..%d", v1, v1+pCtx->argc-1);
+            }else{
+              assert( x.nChar>2 );
+              x.nChar -= 2;
+              ii++;
+            }
+            ii += 3;
+          }else{
+            sqlite3_str_appendf(&x, "%d", v1);
+            if( strncmp(zSynopsis+ii+1, "..P3", 4)==0 && pOp->p3==0 ){
+              ii += 4;
             }
-          }else if( strncmp(zSynopsis+ii+1, "..P3", 4)==0 && pOp->p3==0 ){
-            ii += 4;
           }
         }
-        jj += sqlite3Strlen30(zTemp+jj);
       }else{
-        zTemp[jj++] = c;
+        sqlite3_str_appendchar(&x, 1, c);
       }
     }
-    if( !seenCom && jj<nTemp-5 && pOp->zComment ){
+    if( !seenCom && pOp->zComment ){
-      sqlite3_snprintf(nTemp-jj, zTemp+jj, "; %s", pOp->zComment);
+      sqlite3_str_appendf(&x, "; %s", pOp->zComment);
-      jj += sqlite3Strlen30(zTemp+jj);
     }
-    if( jj<nTemp ) zTemp[jj] = 0;
   }else if( pOp->zComment ){
-    sqlite3_snprintf(nTemp, zTemp, "%s", pOp->zComment);
+    sqlite3_str_appendall(&x, pOp->zComment);
-    jj = sqlite3Strlen30(zTemp);
-  }else{
-    zTemp[0] = 0;
-    jj = 0;
   }
-  return jj;
+  sqlite3StrAccumFinish(&x);
+  return x.nChar;
 }
 #endif /* SQLITE_DEBUG */