Add the ieee754_inc(r,N) function to the ieee754.c extension.

FossilOrigin-Name: 9a36f269451d8832f68e223ac3995493704364e7fd0cc772989c96e863a08d29

ext/misc/ieee754.c

@@ -256,6 +256,37 @@ static void ieee754func_to_blob(
   }
 }
 
+/*
+** SQL Function:   ieee754_inc(r,N)
+**
+** Move the floating point value r by N quantums and return the new
+** values.
+**
+** Behind the scenes: this routine merely casts r into a 64-bit unsigned
+** integer, adds N, then casts the value back into float.
+**
+** Example:  To find the smallest positive number:
+**
+**     SELECT ieee754_inc(0.0,+1);
+*/
+static void ieee754inc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  double r;
+  sqlite3_int64 N;
+  sqlite3_uint64 m1, m2;
+  double r2;
+  UNUSED_PARAMETER(argc);
+  r = sqlite3_value_double(argv[0]);
+  N = sqlite3_value_int64(argv[1]);
+  memcpy(&m1, &r, 8);
+  m2 = m1 + N;
+  memcpy(&r2, &m2, 8);
+  sqlite3_result_double(context, r2);
+}
+
 
 #ifdef _WIN32
 __declspec(dllexport)
@@ -277,7 +308,7 @@ int sqlite3_ieee_init(
     { "ieee754_exponent",  1,   2, ieee754func },
     { "ieee754_to_blob",   1,   0, ieee754func_to_blob },
     { "ieee754_from_blob", 1,   0, ieee754func_from_blob },
-
+    { "ieee754_inc",       2,   0, ieee754inc  },
   };
   unsigned int i;
   int rc = SQLITE_OK;

manifest

@@ -1,5 +1,5 @@
-C Enhance\sthe\ssqlite3AtoF()\sfunction\sso\sthat\sit\scan\soperate\swith\sor\swithout\nlong\sdouble\sand\sprovides\saccurate\sresults\sin\sboth\scases.
-D 2023-07-03T18:32:29.741
+C Add\sthe\sieee754_inc(r,N)\sfunction\sto\sthe\sieee754.c\sextension.
+D 2023-07-05T12:00:32.550
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 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -293,7 +293,7 @@ F ext/misc/explain.c 0086fab288d4352ea638cf40ac382aad3b0dc5e845a1ea829a694c015fd
 F ext/misc/fileio.c 4e7f7cd30de8df4820c552f14af3c9ca451c5ffe1f2e7bef34d598a12ebfb720
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 F ext/misc/fuzzer.c eae560134f66333e9e1ca4c8ffea75df42056e2ce8456734565dbe1c2a92bf3d
-F ext/misc/ieee754.c 984d51fe23e956484ec1049df6f5257002e3ab338cabceb39761c2e80ad10bf4
+F ext/misc/ieee754.c 62a90978204d2c956d5036eb89e548e736ca5fac0e965912867ddd7bb833256d
 F ext/misc/memstat.c 3017a0832c645c0f8c773435620d663855f04690172316bd127270d1a7523d4d
 F ext/misc/memtrace.c 7c0d115d2ef716ad0ba632c91e05bd119cb16c1aedf3bec9f06196ead2d5537b
 F ext/misc/memvfs.c 7dffa8cc89c7f2d73da4bd4ccea1bcbd2bd283e3bb4cea398df7c372a197291b
@@ -2043,9 +2043,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-fd987508d5589d42b46625c97cfb2feeac70fdb1cb11224610554b07a60644e6
+9a36f269451d8832f68e223ac3995493704364e7fd0cc772989c96e863a08d29