From: drh <>
Date: Fri, 21 Apr 2023 15:30:47 +0000 (+0000)
Subject: Add a new modifier to date/time functions: "subsecond".  May be
X-Git-Tag: version-3.42.0~45^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=11d5efde75b4de29c4d70d9fc321a6ec47bc0398;p=thirdparty%2Fsqlite.git

Add a new modifier to date/time functions: "subsecond".  May be
abbreviated as just "subsec".  This modifier causes functions to try
to show fractional seconds if they do not already.

FossilOrigin-Name: 03f2a15e8779d8ca76510badeabde62a0539ce8a6368d7a9688f5aadc215b940
---

diff --git a/manifest b/manifest
index d0a4959f5a..e34485f0ad 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Increase\sCLI\stolerance\sof\sarifically\slow\smemory.
-D 2023-04-20T20:07:14.732
+C Add\sa\snew\smodifier\sto\sdate/time\sfunctions:\s"subsecond".\s\sMay\sbe\nabbreviated\sas\sjust\s"subsec".\s\sThis\smodifier\scauses\sfunctions\sto\stry\nto\sshow\sfractional\sseconds\sif\sthey\sdo\snot\salready.
+D 2023-04-21T15:30:47.608
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -578,7 +578,7 @@ F src/build.c 8357d6ca9a8c9afc297c431df28bc2af407b47f3ef2311875276c944b30c4d54
 F src/callback.c 4cd7225b26a97f7de5fee5ae10464bed5a78f2adefe19534cc2095b3a8ca484a
 F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
 F src/ctime.c 20507cc0b0a6c19cd882fcd0eaeda32ae6a4229fb4b024cfdf3183043d9b703d
-F src/date.c f21815ca7172ce073db3163ac54c8d9f2841077165c1a6123b4d1c376a0c7ec7
+F src/date.c aca9e0c08b400b21238b609aea7c09585396cd770985cf8f475560f69222dad3
 F src/dbpage.c f3eea5f7ec47e09ee7da40f42b25092ecbe961fc59566b8e5f705f34335b2387
 F src/dbstat.c ec92074baa61d883de58c945162d9e666c13cd7cf3a23bc38b4d1c4d0b2c2bef
 F src/delete.c a9c6d3f51c0a31e9b831e0a0580a98d702904b42d216fee530940e40dec34873
@@ -2059,8 +2059,11 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 104ab105ac0e96c0fc61c6d69179bf984fcfe5e0efb2c82f3742456c1b5fe5d1
-R aa97778045cfce91a857103f91418d38
-U larrybr
-Z aaec46b2f4c843c0506897156fa41de9
+P 13f2638622871db9b91db547dcfd38f61c03e7696e4df5144adefcd86140aeba
+R 2529341824942da9d8aad7d6b6ee37a6
+T *branch * subsec-modifier
+T *sym-subsec-modifier *
+T -sym-trunk *
+U drh
+Z 03013fcb8c96af9e078547fa6f689eef
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 3151763d58..730a04f96b 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-13f2638622871db9b91db547dcfd38f61c03e7696e4df5144adefcd86140aeba
\ No newline at end of file
+03f2a15e8779d8ca76510badeabde62a0539ce8a6368d7a9688f5aadc215b940
\ No newline at end of file
diff --git a/src/date.c b/src/date.c
index 7cc6fa684e..9b7957bbf0 100644
--- a/src/date.c
+++ b/src/date.c
@@ -77,6 +77,7 @@ struct DateTime {
   char validTZ;       /* True (1) if tz is valid */
   char tzSet;         /* Timezone was set explicitly */
   char isError;       /* An overflow has occurred */
+  char useSubsec;     /* Display subsecond precision */
 };
 
 
@@ -391,6 +392,11 @@ static int parseDateOrTime(
   }else if( sqlite3AtoF(zDate, &r, sqlite3Strlen30(zDate), SQLITE_UTF8)>0 ){
     setRawDateNumber(p, r);
     return 0;
+  }else if( (sqlite3StrICmp(zDate,"subsec")==0
+             || sqlite3StrICmp(zDate,"subsecond")==0)
+           && sqlite3NotPureFunc(context) ){
+    p->useSubsec = 1;
+    return setDateTimeToCurrent(context, p);
   }
   return 1;
 }
@@ -805,8 +811,22 @@ static int parseModifier(
       **
       ** Move the date backwards to the beginning of the current day,
       ** or month or year.
+      **
+      **    subsecond
+      **    subsec
+      **
+      ** Show subsecond precision in the output of datetime() and
+      ** unixepoch() and strftime('%s').
       */
-      if( sqlite3_strnicmp(z, "start of ", 9)!=0 ) break;
+      if( sqlite3_strnicmp(z, "start of ", 9)!=0 ){
+        if( sqlite3_stricmp(z, "subsec")==0
+         || sqlite3_stricmp(z, "subsecond")==0
+        ){
+          p->useSubsec = 1;
+          rc = 0;
+        }
+        break;
+      }        
       if( !p->validJD && !p->validYMD && !p->validHMS ) break;
       z += 9;
       computeYMD(p);
@@ -1004,7 +1024,11 @@ static void unixepochFunc(
   DateTime x;
   if( isDate(context, argc, argv, &x)==0 ){
     computeJD(&x);
-    sqlite3_result_int64(context, x.iJD/1000 - 21086676*(i64)10000);
+    if( x.useSubsec ){
+      sqlite3_result_double(context, (x.iJD - 21086676*(i64)10000000)/1000.0);
+    }else{
+      sqlite3_result_int64(context, x.iJD/1000 - 21086676*(i64)10000);
+    }
   }
 }
 
@@ -1020,8 +1044,8 @@ static void datetimeFunc(
 ){
   DateTime x;
   if( isDate(context, argc, argv, &x)==0 ){
-    int Y, s;
-    char zBuf[24];
+    int Y, s, n;
+    char zBuf[32];
     computeYMD_HMS(&x);
     Y = x.Y;
     if( Y<0 ) Y = -Y;
@@ -1042,15 +1066,28 @@ static void datetimeFunc(
     zBuf[15] = '0' + (x.m/10)%10;
     zBuf[16] = '0' + (x.m)%10;
     zBuf[17] = ':';
-    s = (int)x.s;
-    zBuf[18] = '0' + (s/10)%10;
-    zBuf[19] = '0' + (s)%10;
-    zBuf[20] = 0;
+    if( x.useSubsec ){
+      s = (int)1000.0*x.s;
+      zBuf[18] = '0' + (s/10000)%10;
+      zBuf[19] = '0' + (s/1000)%10;
+      zBuf[20] = '.';
+      zBuf[21] = '0' + (s/100)%10;
+      zBuf[22] = '0' + (s/10)%10;
+      zBuf[23] = '0' + (s)%10;
+      zBuf[24] = 0;
+      n = 24;
+    }else{
+      s = (int)x.s;
+      zBuf[18] = '0' + (s/10)%10;
+      zBuf[19] = '0' + (s)%10;
+      zBuf[20] = 0;
+      n = 20;
+    }
     if( x.Y<0 ){
       zBuf[0] = '-';
-      sqlite3_result_text(context, zBuf, 20, SQLITE_TRANSIENT);
+      sqlite3_result_text(context, zBuf, n, SQLITE_TRANSIENT);
     }else{
-      sqlite3_result_text(context, &zBuf[1], 19, SQLITE_TRANSIENT);
+      sqlite3_result_text(context, &zBuf[1], n-1, SQLITE_TRANSIENT);
     }
   }
 }
@@ -1067,7 +1104,7 @@ static void timeFunc(
 ){
   DateTime x;
   if( isDate(context, argc, argv, &x)==0 ){
-    int s;
+    int s, n;
     char zBuf[16];
     computeHMS(&x);
     zBuf[0] = '0' + (x.h/10)%10;
@@ -1076,11 +1113,24 @@ static void timeFunc(
     zBuf[3] = '0' + (x.m/10)%10;
     zBuf[4] = '0' + (x.m)%10;
     zBuf[5] = ':';
-    s = (int)x.s;
-    zBuf[6] = '0' + (s/10)%10;
-    zBuf[7] = '0' + (s)%10;
-    zBuf[8] = 0;
-    sqlite3_result_text(context, zBuf, 8, SQLITE_TRANSIENT);
+    if( x.useSubsec ){
+      s = (int)1000.0*x.s;
+      zBuf[6] = '0' + (s/10000)%10;
+      zBuf[7] = '0' + (s/1000)%10;
+      zBuf[8] = '.';
+      zBuf[9] = '0' + (s/100)%10;
+      zBuf[10] = '0' + (s/10)%10;
+      zBuf[11] = '0' + (s)%10;
+      zBuf[12] = 0;
+      n = 12;
+    }else{
+      s = (int)x.s;
+      zBuf[6] = '0' + (s/10)%10;
+      zBuf[7] = '0' + (s)%10;
+      zBuf[8] = 0;
+      n = 8;
+    }
+    sqlite3_result_text(context, zBuf, n, SQLITE_TRANSIENT);
   }
 }
 
@@ -1211,8 +1261,13 @@ static void strftimeFunc(
         break;
       }
       case 's': {
-        i64 iS = (i64)(x.iJD/1000 - 21086676*(i64)10000);
-        sqlite3_str_appendf(&sRes,"%lld",iS);
+        if( x.useSubsec ){
+          sqlite3_str_appendf(&sRes,"%.3f",
+                (x.iJD - 21086676*(i64)10000000)/1000.0);
+        }else{
+          i64 iS = (i64)(x.iJD/1000 - 21086676*(i64)10000);
+          sqlite3_str_appendf(&sRes,"%lld",iS);
+        }
         break;
       }
       case 'S': {