add TBTGetFirst/TBTGetLast methods

diff --git a/expected/btree b/expected/btree
index c359f66..3b04600 100644 (file)
--- a/expected/btree
+++ b/expected/btree
@@ -999,6 +999,8 @@ I   996     dyxa3q596u5mj3wfk8qebotg0oats5wbhcgiwoud5je2ortyjxbt429oqo4sl5hf7pxf8u12e3
 I      997     5sphrrpkp6zogpqtuphdo2e7udw8b83l
 I      998     k83wbmalo9dk07nndjfrlmms1e9tajd25tok40hk820dnrwj050lzn4mu24jnub91d6qsakow7wyhech7x86nuxafgukqah1va18xocexviqtphjp3sg97n216p1cnjihbx0sck6oy63g1pblqk7dutekfoekmmd3mdrap99ga23qj707f6p0h273qg1yre835jztgkltn2ctrxk7617s8oz8bpeu3hhe69u1hyat76nh6ys2sblp7wvz2yy0xxw7lovg47lyovxro650z3oh5sgwj0qjxkdey9j9sgrzkbvmz8nlmff0nijxu7q1gf4z2mll
 I      999     wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
+0      9piyiad8wg6gibvnlj30oh81116zzyll5yrwj698pps7fgxs54azoopggtf8p7hxk9cf4q2lpehe7hginn17dhs1znnoqz39l5s2aea0cye8qjxmx1w8y3bt82f8scsp6rjycuyvsbx3rxkrslqjstcnsgwehfssjo7wgwt1tn9boh20f2jtsk3bs5m1ikwrmgxrhnpx3iikegjjvdq8p4qxrus1b343u4se9ceuomr2txb1dbrv7tv0a8mfu9ydoj5uk73ue78u7qdobhax080pamejri4str8wq1ieexn9xqun68n65bxt3rc715b58wdfi06pxzix04ns1dvqjvyomuxjqo1fpeijeeye
+999    wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
 Value: 'nynle4vpeonknahl5g74by29h61z9pgr6lw8sbv5s12hqv85w4rtgae4u3dxlir4mt1ki3s99lf9y1ouq3agl3otwqm0b33ff9ax1w0nzdenz1azlq8w'
 Not found
 sort -k2 -k3 data/btree.data | ./tbtreetest -c 10 -f temp/BTREE -b -S 1 
@@ -2002,6 +2004,8 @@ I 996     dyxa3q596u5mj3wfk8qebotg0oats5wbhcgiwoud5je2ortyjxbt429oqo4sl5hf7pxf8u12e3
 I      997     5sphrrpkp6zogpqtuphdo2e7udw8b83l
 I      998     k83wbmalo9dk07nndjfrlmms1e9tajd25tok40hk820dnrwj050lzn4mu24jnub91d6qsakow7wyhech7x86nuxafgukqah1va18xocexviqtphjp3sg97n216p1cnjihbx0sck6oy63g1pblqk7dutekfoekmmd3mdrap99ga23qj707f6p0h273qg1yre835jztgkltn2ctrxk7617s8oz8bpeu3hhe69u1hyat76nh6ys2sblp7wvz2yy0xxw7lovg47lyovxro650z3oh5sgwj0qjxkdey9j9sgrzkbvmz8nlmff0nijxu7q1gf4z2mll
 I      999     wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
+0      9piyiad8wg6gibvnlj30oh81116zzyll5yrwj698pps7fgxs54azoopggtf8p7hxk9cf4q2lpehe7hginn17dhs1znnoqz39l5s2aea0cye8qjxmx1w8y3bt82f8scsp6rjycuyvsbx3rxkrslqjstcnsgwehfssjo7wgwt1tn9boh20f2jtsk3bs5m1ikwrmgxrhnpx3iikegjjvdq8p4qxrus1b343u4se9ceuomr2txb1dbrv7tv0a8mfu9ydoj5uk73ue78u7qdobhax080pamejri4str8wq1ieexn9xqun68n65bxt3rc715b58wdfi06pxzix04ns1dvqjvyomuxjqo1fpeijeeye
+999    wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
 Value: 'nynle4vpeonknahl5g74by29h61z9pgr6lw8sbv5s12hqv85w4rtgae4u3dxlir4mt1ki3s99lf9y1ouq3agl3otwqm0b33ff9ax1w0nzdenz1azlq8w'
 Not found
 sort -k2 -k3 data/btree.data | ./tbtreetest -c 10 -f temp/BTREE -b -S 2 
@@ -3005,6 +3009,8 @@ I 996     dyxa3q596u5mj3wfk8qebotg0oats5wbhcgiwoud5je2ortyjxbt429oqo4sl5hf7pxf8u12e3
 I      997     5sphrrpkp6zogpqtuphdo2e7udw8b83l
 I      998     k83wbmalo9dk07nndjfrlmms1e9tajd25tok40hk820dnrwj050lzn4mu24jnub91d6qsakow7wyhech7x86nuxafgukqah1va18xocexviqtphjp3sg97n216p1cnjihbx0sck6oy63g1pblqk7dutekfoekmmd3mdrap99ga23qj707f6p0h273qg1yre835jztgkltn2ctrxk7617s8oz8bpeu3hhe69u1hyat76nh6ys2sblp7wvz2yy0xxw7lovg47lyovxro650z3oh5sgwj0qjxkdey9j9sgrzkbvmz8nlmff0nijxu7q1gf4z2mll
 I      999     wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
+0      9piyiad8wg6gibvnlj30oh81116zzyll5yrwj698pps7fgxs54azoopggtf8p7hxk9cf4q2lpehe7hginn17dhs1znnoqz39l5s2aea0cye8qjxmx1w8y3bt82f8scsp6rjycuyvsbx3rxkrslqjstcnsgwehfssjo7wgwt1tn9boh20f2jtsk3bs5m1ikwrmgxrhnpx3iikegjjvdq8p4qxrus1b343u4se9ceuomr2txb1dbrv7tv0a8mfu9ydoj5uk73ue78u7qdobhax080pamejri4str8wq1ieexn9xqun68n65bxt3rc715b58wdfi06pxzix04ns1dvqjvyomuxjqo1fpeijeeye
+999    wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
 Value: 'nynle4vpeonknahl5g74by29h61z9pgr6lw8sbv5s12hqv85w4rtgae4u3dxlir4mt1ki3s99lf9y1ouq3agl3otwqm0b33ff9ax1w0nzdenz1azlq8w'
 Not found
 cat data/btree.data | ./tbtreetest -c 10 -f temp/BTREE -b -S 0 -k
@@ -4008,6 +4014,8 @@ I 996     dyxa3q596u5mj3wfk8qebotg0oats5wbhcgiwoud5je2ortyjxbt429oqo4sl5hf7pxf8u12e3
 I      997     5sphrrpkp6zogpqtuphdo2e7udw8b83l
 I      998     k83wbmalo9dk07nndjfrlmms1e9tajd25tok40hk820dnrwj050lzn4mu24jnub91d6qsakow7wyhech7x86nuxafgukqah1va18xocexviqtphjp3sg97n216p1cnjihbx0sck6oy63g1pblqk7dutekfoekmmd3mdrap99ga23qj707f6p0h273qg1yre835jztgkltn2ctrxk7617s8oz8bpeu3hhe69u1hyat76nh6ys2sblp7wvz2yy0xxw7lovg47lyovxro650z3oh5sgwj0qjxkdey9j9sgrzkbvmz8nlmff0nijxu7q1gf4z2mll
 I      999     wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
+0      9piyiad8wg6gibvnlj30oh81116zzyll5yrwj698pps7fgxs54azoopggtf8p7hxk9cf4q2lpehe7hginn17dhs1znnoqz39l5s2aea0cye8qjxmx1w8y3bt82f8scsp6rjycuyvsbx3rxkrslqjstcnsgwehfssjo7wgwt1tn9boh20f2jtsk3bs5m1ikwrmgxrhnpx3iikegjjvdq8p4qxrus1b343u4se9ceuomr2txb1dbrv7tv0a8mfu9ydoj5uk73ue78u7qdobhax080pamejri4str8wq1ieexn9xqun68n65bxt3rc715b58wdfi06pxzix04ns1dvqjvyomuxjqo1fpeijeeye
+999    wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
 Value: 'nynle4vpeonknahl5g74by29h61z9pgr6lw8sbv5s12hqv85w4rtgae4u3dxlir4mt1ki3s99lf9y1ouq3agl3otwqm0b33ff9ax1w0nzdenz1azlq8w'
 Not found
 sort -k2n -k3 data/btree.data | ./tbtreetest -c 10 -f temp/BTREE -b -S 1 -k
@@ -5011,6 +5019,8 @@ I 996     dyxa3q596u5mj3wfk8qebotg0oats5wbhcgiwoud5je2ortyjxbt429oqo4sl5hf7pxf8u12e3
 I      997     5sphrrpkp6zogpqtuphdo2e7udw8b83l
 I      998     k83wbmalo9dk07nndjfrlmms1e9tajd25tok40hk820dnrwj050lzn4mu24jnub91d6qsakow7wyhech7x86nuxafgukqah1va18xocexviqtphjp3sg97n216p1cnjihbx0sck6oy63g1pblqk7dutekfoekmmd3mdrap99ga23qj707f6p0h273qg1yre835jztgkltn2ctrxk7617s8oz8bpeu3hhe69u1hyat76nh6ys2sblp7wvz2yy0xxw7lovg47lyovxro650z3oh5sgwj0qjxkdey9j9sgrzkbvmz8nlmff0nijxu7q1gf4z2mll
 I      999     wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
+0      9piyiad8wg6gibvnlj30oh81116zzyll5yrwj698pps7fgxs54azoopggtf8p7hxk9cf4q2lpehe7hginn17dhs1znnoqz39l5s2aea0cye8qjxmx1w8y3bt82f8scsp6rjycuyvsbx3rxkrslqjstcnsgwehfssjo7wgwt1tn9boh20f2jtsk3bs5m1ikwrmgxrhnpx3iikegjjvdq8p4qxrus1b343u4se9ceuomr2txb1dbrv7tv0a8mfu9ydoj5uk73ue78u7qdobhax080pamejri4str8wq1ieexn9xqun68n65bxt3rc715b58wdfi06pxzix04ns1dvqjvyomuxjqo1fpeijeeye
+999    wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
 Value: 'nynle4vpeonknahl5g74by29h61z9pgr6lw8sbv5s12hqv85w4rtgae4u3dxlir4mt1ki3s99lf9y1ouq3agl3otwqm0b33ff9ax1w0nzdenz1azlq8w'
 Not found
 sort -k2n -k3 data/btree.data | ./tbtreetest -c 10 -f temp/BTREE -b -S 2 -k
@@ -6014,5 +6024,7 @@ I 996     dyxa3q596u5mj3wfk8qebotg0oats5wbhcgiwoud5je2ortyjxbt429oqo4sl5hf7pxf8u12e3
 I      997     5sphrrpkp6zogpqtuphdo2e7udw8b83l
 I      998     k83wbmalo9dk07nndjfrlmms1e9tajd25tok40hk820dnrwj050lzn4mu24jnub91d6qsakow7wyhech7x86nuxafgukqah1va18xocexviqtphjp3sg97n216p1cnjihbx0sck6oy63g1pblqk7dutekfoekmmd3mdrap99ga23qj707f6p0h273qg1yre835jztgkltn2ctrxk7617s8oz8bpeu3hhe69u1hyat76nh6ys2sblp7wvz2yy0xxw7lovg47lyovxro650z3oh5sgwj0qjxkdey9j9sgrzkbvmz8nlmff0nijxu7q1gf4z2mll
 I      999     wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
+0      9piyiad8wg6gibvnlj30oh81116zzyll5yrwj698pps7fgxs54azoopggtf8p7hxk9cf4q2lpehe7hginn17dhs1znnoqz39l5s2aea0cye8qjxmx1w8y3bt82f8scsp6rjycuyvsbx3rxkrslqjstcnsgwehfssjo7wgwt1tn9boh20f2jtsk3bs5m1ikwrmgxrhnpx3iikegjjvdq8p4qxrus1b343u4se9ceuomr2txb1dbrv7tv0a8mfu9ydoj5uk73ue78u7qdobhax080pamejri4str8wq1ieexn9xqun68n65bxt3rc715b58wdfi06pxzix04ns1dvqjvyomuxjqo1fpeijeeye
+999    wwwmt1nk5uubzv21es703r4ydddwa6cddek7oyfr2qu1e97tp3zw63vichms11bl4xhwyox7o2eam96g257eb91nf60rcrv5bk7pm7ygbnt3vhi4ar7fwew68jg9zj4b8y7rwkkmywk3ktc2b8xyhwq3k52wsqtnyq2v8nsr1psi47gka9vmhv977mfiy8718rd6otg94mcvwhrs4mko2hxnx9sm6b6p2ixhs94xbgin4ajej8ab3523or8x134804d22ys509lopgay2qoz6qszzormqdrjyhidw9uj8yyvz6is7hai6e1gaat2eiine5qzobjyoci27gl35phmsvxw7t3gshe4mzf9vpz55iw1cq06pgwxjcc3m5ijmmphoe4as3tc0v3cvi76w86l97abu8z7b42ssqvr3uto37p5zyycrqrkf4yz2n6g8eyme23697zup3w38ufjb79juzhfbsicfd17tlil51trl
 Value: 'nynle4vpeonknahl5g74by29h61z9pgr6lw8sbv5s12hqv85w4rtgae4u3dxlir4mt1ki3s99lf9y1ouq3agl3otwqm0b33ff9ax1w0nzdenz1azlq8w'
 Not found

diff --git a/tbtree.c b/tbtree.c
index 1096a94..b7bb757 100644 (file)
--- a/tbtree.c
+++ b/tbtree.c
@@ -1043,4 +1043,69 @@ TBTIterate(TBTree *db, TBTIterator *iterator, TBTValue *key, TBTValue *value ) {
        return TBT_OK;
 }
 
+int 
+TBTGetFirst(TBTree *db, TBTValue *key, TBTValue *value) {
+       TBTIterator     iterator;
+       int rc;
+
+       if ( (rc=TBTInitIterator(db, &iterator))!=TBT_OK )
+               return rc;
+
+       rc=TBTIterate(db, &iterator, key, value);
+
+       TBTFreeIterator(db, &iterator);
+
+       return rc;
+}
+
+static int
+findLast(TBTree *db, TBTValue *key, TBTValue *value, u_int32_t pagenumber) {
+       TBTMemPage      *page;
+       TBTPointer      *ptr;
+       int rc=TBT_OK,i;
+
+       if ( (rc=TBTReadPage(db, pagenumber, &page)) != TBT_OK )
+               return rc;
+
+       if ( page->page.npointer==0 ) {
+               if ( !page->iscached )
+                       tfree(page);
+               return TBT_OK;
+       }
+
+       page->islocked=1;
+       if ( page->page.isleaf ) {
+               ptr = (TBTPointer*)(page->page.data + db->pointersize * (page->page.npointer-1));
+               if ( db->keylen ) {
+                       key->length = db->keylen;
+                       key->value = ptr->key.fixed.key;
+               } else {
+                       key->length = ptr->key.varlen.length; 
+                       key->value = page->page.data + ptr->key.varlen.offset;
+               }
+
+               value->length = ptr->pointer.leaf.length; 
+               value->value = page->page.data + ptr->pointer.leaf.offset;
+       } else {
+               for(i=page->page.npointer-1; i>=0; i--) {
+                       ptr = (TBTPointer*)( page->page.data + db->pointersize * i );
+                       rc = findLast(db, key, value, ptr->pointer.internal.link);
+                       if ( rc!=TBT_OK || key->value )
+                               break;
+               } 
+       }
+
+       page->islocked=0;
+       if ( !page->iscached )
+               tfree(page);
+
+       return rc;
+}
+
+int 
+TBTGetLast(TBTree *db, TBTValue *key, TBTValue *value) {
+       memset(key, 0, sizeof(TBTValue));
+       memset(value, 0, sizeof(TBTValue));
+       return findLast(db, key, value, TBTPAGEROOT);
+}
 

diff --git a/tbtree.h b/tbtree.h
index 083d34c..0df6381 100644 (file)
--- a/tbtree.h
+++ b/tbtree.h
@@ -156,4 +156,7 @@ int TBTIterate(TBTree *db, TBTIterator *iterator, TBTValue *key, TBTValue *value
 void TBTFreeIterator(TBTree *db, TBTIterator *iterator);
 
 
+int TBTGetFirst(TBTree *db, TBTValue *key, TBTValue *value);
+int TBTGetLast(TBTree *db, TBTValue *key, TBTValue *value);
+
 #endif

diff --git a/tbtreetest.c b/tbtreetest.c
index cb5456e..124d733 100644 (file)
--- a/tbtreetest.c
+++ b/tbtreetest.c
@@ -41,7 +41,7 @@ static void
 usage() {
        puts(
        "Usage:\n"
-       "tbtreetest [ -c CACHESIZE ] [-r] [-k] [-f FILE] [-D | -L | -b | -i KEY -v VALUE [ -S strategynumber ] | -d KEY | -s KEY ] [-V] [-q]\n"
+       "tbtreetest [ -c CACHESIZE ] [-r] [-k] [-f FILE] [-D | -L | -z | -b | -i KEY -v VALUE [ -S strategynumber ] | -d KEY | -s KEY ] [-V] [-q]\n"
        "\t-c CACHESIZE    - cache size in pages (default 0)\n"
        "\t-r              - readonly mode\n"
        "\t-k              - fixed size key (integer)\n"
@@ -49,6 +49,7 @@ usage() {
        puts(
        "\t-D              - dump data base\n"
         "\t-L              - list all pairs (in bulk format)\n"
+        "\t-z              - list first and last pairs\n"
        "\t-b              - bulk operations from stdin in format (insert/delete/search):\n"
        "\t                   I KEY VALUE\n"
        "\t                   D KEY\n"
@@ -72,6 +73,7 @@ extern int opterr;
 #define MODE_DUMP      4
 #define MODE_LIST      5
 #define MODE_BULK      6
+#define MODE_FL                7
 
 
 static TBTValue K,V;
@@ -127,7 +129,7 @@ main(int argn, char *argv[]) {
 
        memset(&db, 0, sizeof(TBTree));
 
-       while((i=getopt(argn,argv,"qVbS:Dc:hrkf:i:v:d:s:L")) != EOF) {
+       while((i=getopt(argn,argv,"qVbS:Dc:hrkf:i:v:d:s:Lz")) != EOF) {
                switch(i) {
                        case 'q':
                                quietout=1;
@@ -177,6 +179,9 @@ main(int argn, char *argv[]) {
                        case 'b':
                                mode=MODE_BULK;
                                break;
+                       case 'z':
+                               mode=MODE_FL;
+                               break;
                        case 'h':
                        default:
                                usage();
@@ -237,6 +242,28 @@ main(int argn, char *argv[]) {
 
                }
                TBTFreeIterator(&db, &iterator);
+       } else if ( mode==MODE_FL ) {
+               TBTValue key, value;
+               rc = TBTGetFirst(&db, &key, &value);
+               if ( key.value ) {
+                       if ( db.keylen )
+                               printf("%d", *(int*)(key.value));
+                       else 
+                               printLSTR(key.length, key.value);
+                       fputc('\t', stdout);
+                       printLSTR(value.length, value.value);
+                       fputc('\n', stdout);
+               }
+               rc |= TBTGetLast(&db, &key, &value);
+               if ( key.value ) {
+                       if ( db.keylen )
+                               printf("%d", *(int*)(key.value));
+                       else 
+                               printLSTR(key.length, key.value);
+                       fputc('\t', stdout);
+                       printLSTR(value.length, value.value);
+                       fputc('\n', stdout);
+               }
        } else if ( mode==MODE_BULK ) {
                char buf[TBTREEPAGESIZE];
                int tmp;

diff --git a/tests/btree b/tests/btree
index df18b14..e364e0b 100644 (file)
--- a/tests/btree
+++ b/tests/btree
@@ -9,6 +9,7 @@ do
                echo "$DATACAT | ./tbtreetest -c 10 -f temp/BTREE -b -S $STRATEGY $BTREEOPT"
                $DATACAT | ./tbtreetest -c 10 -f temp/BTREE -b -S $STRATEGY $BTREEOPT || exit 1
                ./tbtreetest -c 10 -f temp/BTREE -S $STRATEGY $BTREEOPT -L || exit 1
+               ./tbtreetest -c 10 -f temp/BTREE -S $STRATEGY $BTREEOPT -z || exit 1
                ./tbtreetest -c 10 -f temp/BTREE -S $STRATEGY $BTREEOPT -s 542 || exit 1 
                ./tbtreetest -c 10 -f temp/BTREE -S $STRATEGY $BTREEOPT -d 542 || exit 1 
                ./tbtreetest -c 10 -f temp/BTREE -S $STRATEGY $BTREEOPT -s 542 || exit 1