67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*-
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* Copyright (c) 2008-2012 WiredTiger, Inc.
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*
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* This is free and unencumbered software released into the public domain.
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*
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* Anyone is free to copy, modify, publish, use, compile, sell, or
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* distribute this software, either in source code form or as a compiled
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* binary, for any purpose, commercial or non-commercial, and by any
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* means.
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*
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* In jurisdictions that recognize copyright laws, the author or authors
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* of this software dedicate any and all copyright interest in the
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* software to the public domain. We make this dedication for the benefit
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* of the public at large and to the detriment of our heirs and
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* successors. We intend this dedication to be an overt act of
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* relinquishment in perpetuity of all present and future rights to this
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* software under copyright law.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <errno.h>
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#include <string.h>
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#include <wiredtiger_ext.h>
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WT_EXTENSION_API *wt_api;
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#define __UNUSED(v) ((void)(v))
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static int
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collate_reverse(WT_COLLATOR *collator, WT_SESSION *session,
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const WT_ITEM *k1, const WT_ITEM *k2, int *cmp)
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{
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size_t len;
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__UNUSED(collator);
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__UNUSED(session);
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len = (k1->size < k2->size) ? k1->size : k2->size;
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if ((*cmp = memcmp(k2->data, k1->data, len)) == 0)
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*cmp = ((int)k1->size - (int)k2->size);
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return (0);
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}
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static WT_COLLATOR reverse_collator = { collate_reverse };
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int
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wiredtiger_extension_init(
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WT_SESSION *session, WT_EXTENSION_API *api, const char *config)
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{
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WT_CONNECTION *conn;
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__UNUSED(config);
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wt_api = api;
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conn = session->connection;
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return (conn->add_collator(conn, "reverse", &reverse_collator, NULL));
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}
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