With the -DSQLITE_ENABLE_JSON_NAN_INF compile-time option, non-standard

JSON numeric values "Inf", "Infinity", "-Inf", "-Infinity", "NaN", "QNaN",
and "SNaN" are all accepted.  SQLite should never generate these values,
but it will accept that with the appropriate compile-time option.

FossilOrigin-Name: 0a050e9013331595e13ca9f859180057b59291c70a6cedb6230eefb25956df9e

manifest

@@ -1,5 +1,5 @@
-C Earlier\sdetection\sof\scorruption\sin\ssqlite3BtreeDelete().\ndbsqlfuzz\sa4c48c291d6e40157a1b749a05eaa7c7faf5a625.
-D 2023-04-02T16:43:20.854
+C With\sthe\s-DSQLITE_ENABLE_JSON_NAN_INF\scompile-time\soption,\snon-standard\nJSON\snumeric\svalues\s"Inf",\s"Infinity",\s"-Inf",\s"-Infinity",\s"NaN",\s"QNaN",\nand\s"SNaN"\sare\sall\saccepted.\s\sSQLite\sshould\snever\sgenerate\sthese\svalues,\nbut\sit\swill\saccept\sthat\swith\sthe\sappropriate\scompile-time\soption.
+D 2023-04-02T20:56:29.250
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -585,7 +585,7 @@ F src/hash.h 3340ab6e1d13e725571d7cee6d3e3135f0779a7d8e76a9ce0a85971fa3953c51
 F src/hwtime.h b638809e083b601b618df877b2e89cb87c2a47a01f4def10be4c4ebb54664ac7
 F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c a8de1db43335fc4946370a7a7e47d89975ad678ddb15078a150e993ba2fb37d4
-F src/json.c 9e3a6acf9e4fa8bb6c84a38538ed9c2f9ad09f106910ef0e9cc68e19c8dc4fc8
+F src/json.c edae65fe1f66ce8b1e7fa6eb036a3d8cf525dacd91d58f12068e80a81ac34f61
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c be5af440f3192c58681b5d43167dbca3ccbfce394d89faa22378a14264781136
 F src/main.c 09bc5191f75dc48fc4dfddda143cb864c0c3dbc3297eb9a9c8e01fea58ff847d
@@ -2052,8 +2052,9 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ec1ddbce7db270afc25f71546fa745935ad74bc72920fccfcb37e98649612bf2
-R 1f7f7780d232aaca9814c0eee95933c1
+P 978dc71c388b37740da38c310674315c7d7fe814d1daa16a146b4df71385d1e1 dbc99662087b63c9ed5b398535a6091fc2c5e507907dd1fcb7ad0b6ab3f17144
+R 0c80a0a9d7056c4e9cc79fd3f48ab255
+T +closed dbc99662087b63c9ed5b398535a6091fc2c5e507907dd1fcb7ad0b6ab3f17144
 U drh
-Z 4959631f3771aa98a65ccf057f0978b9
+Z ff807b459bbce1f6e27ef0b5e65a972d
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-978dc71c388b37740da38c310674315c7d7fe814d1daa16a146b4df71385d1e1
+0a050e9013331595e13ca9f859180057b59291c70a6cedb6230eefb25956df9e

src/json.c

@@ -757,6 +757,27 @@ static int jsonIs4Hex(const char *z){
   return 1;
 }
 
+#ifdef SQLITE_ENABLE_JSON_NAN_INF
+/*
+** Extra floating-point literals to allow in JSON.
+*/
+static const struct NanInfName {
+  char c1;
+  char c2;
+  char n;
+  char eType;
+  char nRepl;
+  char *zMatch;
+  char *zRepl;
+} aNanInfName[] = {
+  { 'i', 'I', 3, JSON_REAL, 7, "inf", "9.0e999" },
+  { 'i', 'I', 8, JSON_REAL, 7, "infinity", "9.0e999" },
+  { 'n', 'N', 3, JSON_NULL, 4, "NaN", "null" },
+  { 'q', 'Q', 4, JSON_NULL, 4, "QNaN", "null" },
+  { 's', 'S', 4, JSON_NULL, 4, "SNaN", "null" },
+}; 
+#endif /* SQLITE_ENABLE_JSON_NAN_INF */
+
 /*
 ** Parse a single JSON value which begins at pParse->zJson[i].  Return the
 ** index of the first character past the end of the value parsed.
@@ -902,6 +923,24 @@ static int jsonParseValue(JsonParse *pParse, u32 i){
         if( c<'0' || c>'9' ) return -1;
         continue;
       }
+#ifdef SQLITE_ENABLE_JSON_NAN_INF
+      /* Non-standard JSON:  Allow "-Inf" (in any case)
+      ** to be understood as floating point literals. */
+      if( (c=='i' || c=='I')
+       && j==i+1
+       && z[i]=='-'
+       && sqlite3StrNICmp(&z[j], "inf",3)==0
+      ){
+        if( !sqlite3Isalnum(z[j+3]) ){
+          jsonParseAddNode(pParse, JSON_REAL, 8, "-9.0e999");
+          return i+4;
+        }else if( (sqlite3StrNICmp(&z[j],"infinity",8)==0 &&
+                  !sqlite3Isalnum(z[j+8])) ){
+          jsonParseAddNode(pParse, JSON_REAL, 8, "-9.0e999");
+          return i+9;
+        }
+      }
+#endif
       break;
     }
     if( z[j-1]<'0' ) return -1;
@@ -915,6 +954,20 @@ static int jsonParseValue(JsonParse *pParse, u32 i){
   }else if( c==0 ){
     return 0;   /* End of file */
   }else{
+#ifdef SQLITE_ENABLE_JSON_NAN_INF
+    int k, nn;
+    for(k=0; k<sizeof(aNanInfName)/sizeof(aNanInfName[0]); k++){
+      if( c!=aNanInfName[k].c1 && c!=aNanInfName[k].c2 ) continue;
+      nn = aNanInfName[k].n;
+      if( sqlite3StrNICmp(&z[i], aNanInfName[k].zMatch, nn)!=0 ){
+        continue;
+      }
+      if( sqlite3Isalnum(z[i+nn]) ) continue;
+      jsonParseAddNode(pParse, aNanInfName[k].eType,
+          aNanInfName[k].nRepl, aNanInfName[k].zRepl);
+      return i + nn;
+    }
+#endif
     return -1;  /* Syntax error */
   }
 }