Add the UINT collating sequence extension. The implementation is copied out

of the "natsort" branch.

FossilOrigin-Name: 6f46c6e3e3c471ca864d7596e0211ee90316b784c8fe22c7ae177c9d29731dc7

ext/misc/uint.c

@@ -0,0 +1,91 @@
+/*
+** 2020-04-14
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This SQLite extension implements the UINT collating sequence.
+**
+** UINT works like BINARY for text, except that embedded strings
+** of digits compare in numeric order.
+**
+**     *   Leading zeros are handled properly, in the sense that
+**         they do not mess of the maginitude comparison of embedded
+**         strings of digits.  "x00123y" is equal to "x123y".
+**
+**     *   Only unsigned integers are recognized.  Plus and minus
+**         signs are ignored.  Decimal points and exponential notation
+**         are ignored.
+**
+**     *   Embedded integers can be of arbitrary length.  Comparison
+**         is *not* limited integers that can be expressed as a
+**         64-bit machine integer.
+*/
+#include "sqlite3ext.h"
+SQLITE_EXTENSION_INIT1
+#include <assert.h>
+#include <string.h>
+#include <ctype.h>
+
+/*
+** Compare text in lexicographic order, except strings of digits
+** compare in numeric order.
+*/
+static int uintCollFunc(
+  void *notUsed,
+  int nKey1, const void *pKey1,
+  int nKey2, const void *pKey2
+){
+  const unsigned char *zA = (const unsigned char*)pKey1;
+  const unsigned char *zB = (const unsigned char*)pKey2;
+  int i=0, j=0, x;
+  while( i<nKey1 && j<nKey2 ){
+    x = zA[i] - zB[j];
+    if( isdigit(zA[i]) ){
+      int k;
+      if( !isdigit(zB[j]) ) return x;
+      while( i<nKey1 && zA[i]=='0' ){ i++; }
+      while( j<nKey2 && zB[j]=='0' ){ j++; }
+      k = 0;
+      while( i+k<nKey1 && isdigit(zA[i+k])
+             && j+k<nKey2 && isdigit(zB[j+k]) ){
+        k++;
+      }
+      if( i+k<nKey1 && isdigit(zA[i+k]) ){
+        return +1;
+      }else if( j+k<nKey2 && isdigit(zB[j+k]) ){
+        return -1;
+      }else{
+        x = memcmp(zA+i, zB+j, k);
+        if( x ) return x;
+        i += k;
+        j += k;
+      }
+    }else if( x ){
+      return x;
+    }else{
+      i++;
+      j++;
+    }
+  }
+  return (nKey1 - i) - (nKey2 - j);
+}
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int sqlite3_uint_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  return sqlite3_create_collation(db, "uint", SQLITE_UTF8, 0, uintCollFunc);
+}

manifest

@@ -1,5 +1,5 @@
-C When\scompiling\sthe\sshell\sfor\sWinRT,\savoid\susing\sWin32\sAPIs\sthat\sare\sunavailable.
-D 2020-04-09T15:31:22.553
+C Add\sthe\sUINT\scollating\ssequence\sextension.\s\sThe\simplementation\sis\scopied\sout\nof\sthe\s"natsort"\sbranch.
+D 2020-04-14T15:48:55.103
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -320,6 +320,7 @@ F ext/misc/sqlar.c c9e5d58544e1506135806a1e0f525f92d4bb6bb125348dce469d778fb334f
 F ext/misc/stmt.c 8a8dc4675042e4551e4afe99b8d0cc7a4a2fc1a8dacc0a9ce1b1bbff145da93d
 F ext/misc/templatevtab.c 8a16a91a5ceaccfcbd6aaaa56d46828806e460dd194965b3f77bf38f14b942c4
 F ext/misc/totype.c fa4aedeb07f66169005dffa8de3b0a2b621779fd44f85c103228a42afa71853b
+F ext/misc/uint.c 5870865fb5f6153db18db443f3ecdcdb17a06567ee47ecd9fd26e3ec7e5f6ce8
 F ext/misc/unionvtab.c 36237f0607ca954ac13a4a0e2d2ac40c33bc6e032a5f55f431713061ef1625f9
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-R 979d0103f7b3acef2369409e370d6fa7
-U mistachkin
-Z 484824f16820465db78cbfdb9a5d496b
+P 85d3dc8c50d8dbb8eac1956e8976e861d3b671e03355ca9257060fa3dca51cc4
+R 90abc1adacfe98d7a7e36bcfbb02dfec
+U drh
+Z 3c9766781f32af8c6294daca79b779f0

manifest.uuid

@@ -1 +1 @@
-85d3dc8c50d8dbb8eac1956e8976e861d3b671e03355ca9257060fa3dca51cc4
+6f46c6e3e3c471ca864d7596e0211ee90316b784c8fe22c7ae177c9d29731dc7