Update comment for substrFunc(). Added additional SUBSTR() test cases.

FossilOrigin-Name: d7b3801dc7fad1b002f892fb5d82047ebff98369

diff --git a/manifest b/manifest
index b89db16a5df54d2f9828d3440852247dc5818410..4e029ff51e30f24ca5b22620506b7f8d35f8977a 100644 (file)
--- a/manifest
+++ b/manifest
@@ -1,8 +1,5 @@
------BEGIN PGP SIGNED MESSAGE-----
-Hash: SHA1
-
-C Suppress\sunnecessary\sOP_Noop\sinstructions\son\swhen\sthe\sright\stable\sof\sa\s\nLEFT\sJOIN\suses\sthe\sindex-only\soptimization.
-D 2009-11-12T04:26:39
+C Update\scomment\sfor\ssubstrFunc().\s\sAdded\sadditional\sSUBSTR()\stest\scases.
+D 2009-11-12T05:04:50
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in 53f3dfa49f28ab5b80cb083fb7c9051e596bcfa1
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -120,7 +117,7 @@ F src/delete.c ec04635d152debdab70d4b30c5516b59282075ea
 F src/expr.c be605c60ff84699f3087209f2f86a140a6a5e96c
 F src/fault.c 160a0c015b6c2629d3899ed2daf63d75754a32bb
 F src/fkey.c 41219cba186bcf0a053e42327dfa23aaba4f834a
-F src/func.c 97cb15ef7a7c32293a938589c9eb6933f6688a21
+F src/func.c bf54e1202cbfb28bf4b1fd9b58899009ae76716f
 F src/global.c 271952d199a8cc59d4ce840b3bbbfd2f30c8ba32
 F src/hash.c 458488dcc159c301b8e7686280ab209f1fb915af
 F src/hash.h 2894c932d84d9f892d4b4023a75e501f83050970
@@ -400,6 +397,7 @@ F test/fts3expr.test 05dab77387801e4900009917bb18f556037d82da
 F test/fts3expr2.test 18da930352e5693eaa163a3eacf96233b7290d1a
 F test/fts3near.test dc196dd17b4606f440c580d45b3d23aa975fd077
 F test/func.test af106ed834001738246d276659406823e35cde7b
+F test/func2.test 772d66227e4e6684b86053302e2d74a2500e1e0f
 F test/fuzz.test a4174c3009a3e2c2e14b31b364ebf7ddb49de2c9
 F test/fuzz2.test ea38692ce2da99ad79fe0be5eb1a452c1c4d37bb
 F test/fuzz3.test aec64345184d1662bd30e6a17851ff659d596dc5
@@ -770,14 +768,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P cff1b36ab2c417611f59e96694005c03762788d2
-R 27ea3cc9eb26b161a34ebbe34741190e
-U drh
-Z 1781a9afcc14917ad21934e90b64a6d9
------BEGIN PGP SIGNATURE-----
-Version: GnuPG v1.4.6 (GNU/Linux)
-
-iD8DBQFK+46CoxKgR168RlERAs2eAJ9q+CJ0pBp0WyIBy8gQXLRefcg5DACdH31c
-P01a4JtLngUfv/eThlehXws=
-=kK2G
------END PGP SIGNATURE-----
+P e8aec08bee1c8d593474561898037aed571e64ce
+R eff535e110e372495a1d64aaae18bfd2
+U shaneh
+Z 84a73f30a17aaa895fe2eee2c345ef85

diff --git a/manifest.uuid b/manifest.uuid
index af79f3e45274073321db3173eed67f66edacbce1..e10db54a287c93a91ecbb595647c5b5ebf933bef 100644 (file)
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-e8aec08bee1c8d593474561898037aed571e64ce
\ No newline at end of file
+d7b3801dc7fad1b002f892fb5d82047ebff98369
\ No newline at end of file

diff --git a/src/func.c b/src/func.c
index e1ad9a36cc0598e8fb425f8ab7d1602dfcb4fbd0..8cb7a037c086f340db778f148a716556783bb3f5 100644 (file)
--- a/src/func.c
+++ b/src/func.c
@@ -157,6 +157,8 @@ static void absFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
 ** If x is a blob, then we count bytes.
 **
 ** If p1 is negative, then we begin abs(p1) from the end of x[].
+**
+** If p2 is negative, return the p2 characters preceeding p1.
 */
 static void substrFunc(
   sqlite3_context *context,

diff --git a/test/func2.test b/test/func2.test
new file mode 100644 (file)
index 0000000..08ad857
--- /dev/null
+++ b/test/func2.test
@@ -0,0 +1,511 @@
+# 2009 November 11
+#
+# 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 file implements regression tests for SQLite library.  The
+# focus of this file is testing built-in functions.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# Test plan:
+#
+#   func2-1.*: substr implementation (ascii)
+#   func2-2.*: substr implementation (utf8)
+#   func2-3.*: substr implementation (blob)
+#
+
+proc bin_to_hex {blob} {
+  set bytes {}
+  binary scan $blob \c* bytes
+  set bytes2 [list]
+  foreach b $bytes {lappend bytes2 [format %02X [expr $b & 0xFF]]}
+  join $bytes2 {}
+}
+
+#----------------------------------------------------------------------------
+# Test cases func2-1.*: substr implementation (ascii)
+#
+
+do_test func2-1.1 {
+  execsql {SELECT 'Supercalifragilisticexpialidocious'}
+} {Supercalifragilisticexpialidocious}
+
+# substr(x,y), substr(x,y,z)
+do_test func2-1.2.1 {
+  catchsql {SELECT SUBSTR()}
+} {1 {wrong number of arguments to function SUBSTR()}}
+do_test func2-1.2.2 {
+  catchsql {SELECT SUBSTR('Supercalifragilisticexpialidocious')}
+} {1 {wrong number of arguments to function SUBSTR()}}
+do_test func2-1.2.3 {
+  catchsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 1,1,1)}
+} {1 {wrong number of arguments to function SUBSTR()}}
+
+# p1 is 1-indexed
+do_test func2-1.3 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 0)}
+} {Supercalifragilisticexpialidocious}
+do_test func2-1.4 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 1)}
+} {Supercalifragilisticexpialidocious}
+do_test func2-1.5 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 2)}
+} {upercalifragilisticexpialidocious}
+do_test func2-1.6 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 30)}
+} {cious}
+do_test func2-1.7 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 34)}
+} {s}
+do_test func2-1.8 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 35)}
+} {{}}
+do_test func2-1.9 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 36)}
+} {{}}
+
+# if p1<0, start from right
+do_test func2-1.10 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -0)}
+} {Supercalifragilisticexpialidocious}
+do_test func2-1.11 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -1)}
+} {s}
+do_test func2-1.12 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -2)}
+} {us}
+do_test func2-1.13 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -30)}
+} {rcalifragilisticexpialidocious}
+do_test func2-1.14 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -34)}
+} {Supercalifragilisticexpialidocious}
+do_test func2-1.15 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -35)}
+} {Supercalifragilisticexpialidocious}
+do_test func2-1.16 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -36)}
+} {Supercalifragilisticexpialidocious}
+
+# p1 is 1-indexed, p2 length to return
+do_test func2-1.17.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 0, 1)}
+} {{}}
+do_test func2-1.17.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 0, 2)}
+} {S}
+do_test func2-1.18 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 1, 1)}
+} {S}
+do_test func2-1.19.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 2, 0)}
+} {{}}
+do_test func2-1.19.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 2, 1)}
+} {u}
+do_test func2-1.19.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 2, 2)}
+} {up}
+do_test func2-1.20 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 30, 1)}
+} {c}
+do_test func2-1.21 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 34, 1)}
+} {s}
+do_test func2-1.22 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 35, 1)}
+} {{}}
+do_test func2-1.23 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 36, 1)}
+} {{}}
+
+# if p1<0, start from right, p2 length to return
+do_test func2-1.24 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -0, 1)}
+} {{}}
+do_test func2-1.25.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -1, 0)}
+} {{}}
+do_test func2-1.25.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -1, 1)}
+} {s}
+do_test func2-1.25.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -1, 2)}
+} {s}
+do_test func2-1.26 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -2, 1)}
+} {u}
+do_test func2-1.27 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -30, 1)}
+} {r}
+do_test func2-1.28.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -34, 0)}
+} {{}}
+do_test func2-1.28.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -34, 1)}
+} {S}
+do_test func2-1.28.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -34, 2)}
+} {Su}
+do_test func2-1.29.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -35, 1)}
+} {{}}
+do_test func2-1.29.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -35, 2)}
+} {S}
+do_test func2-1.30.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -36, 0)}
+} {{}}
+do_test func2-1.30.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -36, 1)}
+} {{}}
+do_test func2-1.30.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -36, 2)}
+} {{}}
+do_test func2-1.30.3 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', -36, 3)}
+} {S}
+
+# p1 is 1-indexed, p2 length to return, p2<0 return p2 chars before p1
+do_test func2-1.31.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 0, 0)}
+} {{}}
+do_test func2-1.31.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 0, -1)}
+} {{}}
+do_test func2-1.31.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 0, -2)}
+} {{}}
+do_test func2-1.32.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 1, 0)}
+} {{}}
+do_test func2-1.32.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 1, -1)}
+} {{}}
+do_test func2-1.33.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 2, 0)}
+} {{}}
+do_test func2-1.33.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 2, -1)}
+} {S}
+do_test func2-1.33.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 2, -2)}
+} {S}
+do_test func2-1.34.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 3, 0)}
+} {{}}
+do_test func2-1.34.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 3, -1)}
+} {u}
+do_test func2-1.34.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 3, -2)}
+} {Su}
+do_test func2-1.35.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 30, -1)}
+} {o}
+do_test func2-1.35.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 30, -2)}
+} {do}
+do_test func2-1.36 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 34, -1)}
+} {u}
+do_test func2-1.37 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 35, -1)}
+} {s}
+do_test func2-1.38.0 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 36, 0)}
+} {{}}
+do_test func2-1.38.1 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 36, -1)}
+} {{}}
+do_test func2-1.38.2 {
+  execsql {SELECT SUBSTR('Supercalifragilisticexpialidocious', 36, -2)}
+} {s}
+
+
+#----------------------------------------------------------------------------
+# Test cases func2-2.*: substr implementation (utf8)
+#
+
+# Only do the following tests if TCL has UTF-8 capabilities
+#
+if {"\u1234"!="u1234"} {
+
+do_test func2-2.1.1 {
+  execsql "SELECT 'hi\u1234ho'"
+} "hi\u1234ho"
+
+# substr(x,y), substr(x,y,z)
+do_test func2-2.1.2 {
+  catchsql "SELECT SUBSTR()"
+} {1 {wrong number of arguments to function SUBSTR()}}
+do_test func2-2.1.3 {
+  catchsql "SELECT SUBSTR('hi\u1234ho')"
+} {1 {wrong number of arguments to function SUBSTR()}}
+do_test func2-2.1.4 {
+  catchsql "SELECT SUBSTR('hi\u1234ho', 1,1,1)"
+} {1 {wrong number of arguments to function SUBSTR()}}
+
+do_test func2-2.2.0 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 0, 0)"
+} {{}}
+do_test func2-2.2.1 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 0, 1)"
+} {{}}
+do_test func2-2.2.2 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 0, 2)"
+} "h"
+do_test func2-2.2.3 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 0, 3)"
+} "hi"
+do_test func2-2.2.4 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 0, 4)"
+} "hi\u1234"
+do_test func2-2.2.5 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 0, 5)"
+} "hi\u1234h"
+do_test func2-2.2.6 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 0, 6)"
+} "hi\u1234ho"
+
+do_test func2-2.3.0 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 1, 0)"
+} {{}}
+do_test func2-2.3.1 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 1, 1)"
+} "h"
+do_test func2-2.3.2 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 1, 2)"
+} "hi"
+do_test func2-2.3.3 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 1, 3)"
+} "hi\u1234"
+do_test func2-2.3.4 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 1, 4)"
+} "hi\u1234h"
+do_test func2-2.3.5 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 1, 5)"
+} "hi\u1234ho"
+do_test func2-2.3.6 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 1, 6)"
+} "hi\u1234ho"
+
+do_test func2-2.4.0 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 3, 0)"
+} {{}}
+do_test func2-2.4.1 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 3, 1)"
+} "\u1234"
+do_test func2-2.4.2 {
+  execsql "SELECT SUBSTR('hi\u1234ho', 3, 2)"
+} "\u1234h"
+
+do_test func2-2.5.0 {
+  execsql "SELECT SUBSTR('\u1234', 0, 0)"
+} {{}}
+do_test func2-2.5.1 {
+  execsql "SELECT SUBSTR('\u1234', 0, 1)"
+} {{}}
+do_test func2-2.5.2 {
+  execsql "SELECT SUBSTR('\u1234', 0, 2)"
+} "\u1234"
+do_test func2-2.5.3 {
+  execsql "SELECT SUBSTR('\u1234', 0, 3)"
+} "\u1234"
+
+do_test func2-2.6.0 {
+  execsql "SELECT SUBSTR('\u1234', 1, 0)"
+} {{}}
+do_test func2-2.6.1 {
+  execsql "SELECT SUBSTR('\u1234', 1, 1)"
+} "\u1234"
+do_test func2-2.6.2 {
+  execsql "SELECT SUBSTR('\u1234', 1, 2)"
+} "\u1234"
+do_test func2-2.6.3 {
+  execsql "SELECT SUBSTR('\u1234', 1, 3)"
+} "\u1234"
+
+do_test func2-2.7.0 {
+  execsql "SELECT SUBSTR('\u1234', 2, 0)"
+} {{}}
+do_test func2-2.7.1 {
+  execsql "SELECT SUBSTR('\u1234', 2, 1)"
+} {{}}
+do_test func2-2.7.2 {
+  execsql "SELECT SUBSTR('\u1234', 2, 2)"
+} {{}}
+
+do_test func2-2.8.0 {
+  execsql "SELECT SUBSTR('\u1234', -1, 0)"
+} {{}}
+do_test func2-2.8.1 {
+  execsql "SELECT SUBSTR('\u1234', -1, 1)"
+} "\u1234"
+do_test func2-2.8.2 {
+  execsql "SELECT SUBSTR('\u1234', -1, 2)"
+} "\u1234"
+do_test func2-2.8.3 {
+  execsql "SELECT SUBSTR('\u1234', -1, 3)"
+} "\u1234"
+
+} ;# End \u1234!=u1234
+
+#----------------------------------------------------------------------------
+# Test cases func2-3.*: substr implementation (blob)
+#
+
+ifcapable {!bloblit} {
+  finish_test
+  return
+}
+
+do_test func2-3.1.1 {
+  set blob [execsql "SELECT x'1234'"]
+  bin_to_hex [lindex $blob 0]
+} "1234"
+
+# substr(x,y), substr(x,y,z)
+do_test func2-3.1.2 {
+  catchsql {SELECT SUBSTR()}
+} {1 {wrong number of arguments to function SUBSTR()}}
+do_test func2-3.1.3 {
+  catchsql {SELECT SUBSTR(x'1234')}
+} {1 {wrong number of arguments to function SUBSTR()}}
+do_test func2-3.1.4 {
+  catchsql {SELECT SUBSTR(x'1234', 1,1,1)}
+} {1 {wrong number of arguments to function SUBSTR()}}
+
+do_test func2-3.2.0 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 0, 0)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.2.1 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 0, 1)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.2.2 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 0, 2)"]
+  bin_to_hex [lindex $blob 0]
+} "12"
+do_test func2-3.2.3 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 0, 3)"]
+  bin_to_hex [lindex $blob 0]
+} "1234"
+
+do_test func2-3.3.0 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 1, 0)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.3.1 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 1, 1)"]
+  bin_to_hex [lindex $blob 0]
+} "12"
+do_test func2-3.3.2 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 1, 2)"]
+  bin_to_hex [lindex $blob 0]
+} "1234"
+do_test func2-3.3.3 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 1, 3)"]
+  bin_to_hex [lindex $blob 0]
+} "1234"
+
+do_test func2-3.4.0 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -1, 0)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.4.1 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -1, 1)"]
+  bin_to_hex [lindex $blob 0]
+} "34"
+do_test func2-3.4.2 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -1, 2)"]
+  bin_to_hex [lindex $blob 0]
+} "34"
+do_test func2-3.4.3 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -1, 3)"]
+  bin_to_hex [lindex $blob 0]
+} "34"
+
+do_test func2-3.5.0 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -2, 0)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.5.1 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -2, 1)"]
+  bin_to_hex [lindex $blob 0]
+} "12"
+do_test func2-3.5.2 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -2, 2)"]
+  bin_to_hex [lindex $blob 0]
+} "1234"
+do_test func2-3.5.3 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -2, 3)"]
+  bin_to_hex [lindex $blob 0]
+} "1234"
+
+do_test func2-3.6.0 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -1, 0)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.6.1 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -1, -1)"]
+  bin_to_hex [lindex $blob 0]
+} "12"
+do_test func2-3.6.2 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -1, -2)"]
+  bin_to_hex [lindex $blob 0]
+} "12"
+do_test func2-3.6.3 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -1, -3)"]
+  bin_to_hex [lindex $blob 0]
+} "12"
+
+do_test func2-3.7.0 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -2, 0)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.7.1 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -2, -1)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.7.2 {
+  set blob [execsql "SELECT SUBSTR(x'1234', -2, -2)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+
+do_test func2-3.8.0 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 1, 0)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.8.1 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 1, -1)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.8.2 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 1, -2)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+
+do_test func2-3.9.0 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 2, 0)"]
+  bin_to_hex [lindex $blob 0]
+} {}
+do_test func2-3.9.1 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 2, -1)"]
+  bin_to_hex [lindex $blob 0]
+} "12"
+do_test func2-3.9.2 {
+  set blob [execsql "SELECT SUBSTR(x'1234', 2, -2)"]
+  bin_to_hex [lindex $blob 0]
+} "12"
+
+finish_test