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\n\n\\\\\\1\<\/td\>\<\/tr\>\\2\<\/td\>\<\/tr\>\\3\<\/td\>\<\/tr\>\\4\<\/td\>\<\/tr\>\\5\<\/td\>\<\/tr\>\\6\<\/td\>\<\/tr\>\\7\<\/td\>\<\/tr\>\\8\<\/td\>\<\/tr\>\\9\<\/td\>\<\/tr\>\\10\<\/td\>\<\/tr\>\\11\<\/td\>\<\/tr\>\\12\<\/td\>\<\/tr\>\\13\<\/td\>\<\/tr\>\\14\<\/td\>\<\/tr\>\\15\<\/td\>\<\/tr\>\\16\<\/td\>\<\/tr\>\\17\<\/td\>\<\/tr\>\\18\<\/td\>\<\/tr\>\\19\<\/td\>\<\/tr\>\\20\<\/td\>\<\/tr\>\\21\<\/td\>\<\/tr\>\\22\<\/td\>\<\/tr\>\\23\<\/td\>\<\/tr\>\\24\<\/td\>\<\/tr\>\\25\<\/td\>\<\/tr\>\\26\<\/td\>\<\/tr\>\\27\<\/td\>\<\/tr\>\\28\<\/td\>\<\/tr\>\\29\<\/td\>\<\/tr\>\\30\<\/td\>\<\/tr\>\\31\<\/td\>\<\/tr\>\\32\<\/td\>\<\/tr\>\\33\<\/td\>\<\/tr\>\\34\<\/td\>\<\/tr\>\\35\<\/td\>\<\/tr\>\\36\<\/td\>\<\/tr\>\\37\<\/td\>\<\/tr\>\\38\<\/td\>\<\/tr\>\\39\<\/td\>\<\/tr\>\\40\<\/td\>\<\/tr\>\\41\<\/td\>\<\/tr\>\\42\<\/td\>\<\/tr\>\\43\<\/td\>\<\/tr\>\\44\<\/td\>\<\/tr\>\\45\<\/td\>\<\/tr\>\\46\<\/td\>\<\/tr\>\\47\<\/td\>\<\/tr\>\\48\<\/td\>\<\/tr\>\\49\<\/td\>\<\/tr\>\\50\<\/td\>\<\/tr\>\\51\<\/td\>\<\/tr\>\\52\<\/td\>\<\/tr\>\\53\<\/td\>\<\/tr\>\\54\<\/td\>\<\/tr\>\\55\<\/td\>\<\/tr\>\\56\<\/td\>\<\/tr\>\\57\<\/td\>\<\/tr\>\\58\<\/td\>\<\/tr\>\\59\<\/td\>\<\/tr\>\\60\<\/td\>\<\/tr\>\\61\<\/td\>\<\/tr\>\\62\<\/td\>\<\/tr\>\\63\<\/td\>\<\/tr\>\\64\<\/td\>\<\/tr\>\\65\<\/td\>\<\/tr\>\\66\<\/td\>\<\/tr\>\\67\<\/td\>\<\/tr\>\\68\<\/td\>\<\/tr\>\\69\<\/td\>\<\/tr\>\\70\<\/td\>\<\/tr\>\\71\<\/td\>\<\/tr\>\\72\<\/td\>\<\/tr\>\\73\<\/td\>\<\/tr\>\\74\<\/td\>\<\/tr\>\<\/table\>\<\/td\>\\\\\\\/\/\ Retrieve\ a\ record\ from\ the\ database\,\ if\ it\ exists\<\/span\>\<\/td\>\<\/tr\>\\\static\<\/span\>\ \void\<\/span\>\ \get\<\/span\>\\(\<\/span\>\bdb\_drv\_t\<\/span\>\ \\*\<\/span\>\bdb\_drv\<\/span\>\\,\<\/span\>\ \ErlIOVec\<\/span\>\ \\*\<\/span\>\ev\<\/span\>\\)\<\/span\>\ \\{\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ErlDrvBinary\<\/span\>\\*\<\/span\>\ \input\<\/span\>\ \\=\<\/span\>\ \ev\<\/span\>\\-\>\;\<\/span\>\binv\<\/span\>\\[\<\/span\>\1\<\/span\>\\]\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ErlDrvBinary\<\/span\>\ \\*\<\/span\>\output\_bytes\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \char\<\/span\>\ \\*\<\/span\>\bytes\<\/span\>\ \\=\<\/span\>\ \input\<\/span\>\\-\>\;\<\/span\>\orig\_bytes\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \char\<\/span\>\ \\*\<\/span\>\key\_bytes\<\/span\>\ \\=\<\/span\>\ \bytes\<\/span\>\\+\<\/span\>\1\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \<\/td\>\<\/tr\>\\\ \ \DB\<\/span\>\ \\*\<\/span\>\db\<\/span\>\ \\=\<\/span\>\ \bdb\_drv\<\/span\>\\-\>\;\<\/span\>\db\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \DBT\<\/span\>\ \key\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \DBT\<\/span\>\ \value\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \int\<\/span\>\ \status\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \<\/td\>\<\/tr\>\\\ \ \bzero\<\/span\>\\(\<\/span\>\\&\;\<\/span\>\key\<\/span\>\\,\<\/span\>\ \sizeof\<\/span\>\\(\<\/span\>\DBT\<\/span\>\\)\)\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \bzero\<\/span\>\\(\<\/span\>\\&\;\<\/span\>\value\<\/span\>\\,\<\/span\>\ \sizeof\<\/span\>\\(\<\/span\>\DBT\<\/span\>\\)\)\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \<\/td\>\<\/tr\>\\\ \ \key\<\/span\>\\.\<\/span\>\data\<\/span\>\ \\=\<\/span\>\ \key\_bytes\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \key\<\/span\>\\.\<\/span\>\size\<\/span\>\ \\=\<\/span\>\ \KEY\_SIZE\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \<\/td\>\<\/tr\>\\\ \ \\/\/\ Have\ BerkeleyDB\ allocate\ memory\ big\ enough\ to\ store\ the\ value\<\/span\>\<\/td\>\<\/tr\>\\\ \ \value\<\/span\>\\.\<\/span\>\flags\<\/span\>\ \\=\<\/span\>\ \DB\_DBT\_MALLOC\<\/span\>\\;\<\/span\>\ \\/\/\ Don\&\#39\;t\ forget\ to\ free\ it\ later\<\/span\>\<\/td\>\<\/tr\>\\\ \ \<\/td\>\<\/tr\>\\\ \ \\/\/\ Retrieve\ the\ record\<\/span\>\<\/td\>\<\/tr\>\\\ \ \status\<\/span\>\ \\=\<\/span\>\ \db\<\/span\>\\-\>\;\<\/span\>\get\<\/span\>\\(\<\/span\>\db\<\/span\>\\,\<\/span\>\ \NULL\<\/span\>\\,\<\/span\>\ \\&\;\<\/span\>\key\<\/span\>\\,\<\/span\>\ \\&\;\<\/span\>\value\<\/span\>\\,\<\/span\>\ \0\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\\<\/td\>\<\/tr\>\\\ \ \if\<\/span\>\\(\<\/span\>\status\<\/span\>\ \\=\=\<\/span\>\ \0\<\/span\>\\)\<\/span\>\ \\{\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \\/\/\ Get\ went\ OK\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \<\/td\>\<\/tr\>\\\ \ \ \\/\/\ Copy\ the\ record\ value\ to\ an\ output\ structure\ to\ return\ to\ Erlang\ VM\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \output\_bytes\<\/span\>\ \\=\<\/span\>\ \driver\_alloc\_binary\<\/span\>\\(\<\/span\>\value\<\/span\>\\.\<\/span\>\size\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \output\_bytes\<\/span\>\\-\>\;\<\/span\>\orig\_size\<\/span\>\ \\=\<\/span\>\ \value\<\/span\>\\.\<\/span\>\size\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \memcpy\<\/span\>\\(\<\/span\>\output\_bytes\<\/span\>\\-\>\;\<\/span\>\orig\_bytes\<\/span\>\\,\<\/span\>\ \value\<\/span\>\\.\<\/span\>\data\<\/span\>\\,\<\/span\>\ \value\<\/span\>\\.\<\/span\>\size\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \free\<\/span\>\\(\<\/span\>\value\<\/span\>\\.\<\/span\>\data\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \<\/td\>\<\/tr\>\\\ \ \ \ \\/\/\ TODO\:Figure\ out\ if\ we\ can\ somehow\ use\ this\ original\ memory\ without\ recopying\ a\ la\:\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \\/\/binary\-\>\;orig\_bytes\ \=\ \(char\ \*\)\&\;data\.data\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \<\/td\>\<\/tr\>\\\ \ \ \ \\/\/\ Returns\ tuple\ \{ok\,\ Data\}\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ErlDrvTermData\<\/span\>\ \spec\<\/span\>\\[\]\<\/span\>\ \\=\<\/span\>\ \\{\<\/span\>\ERL\_DRV\_ATOM\<\/span\>\\,\<\/span\>\ \driver\_mk\_atom\<\/span\>\\(\<\/span\>\\"\;ok\"\;\<\/span\>\\)\,\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \ \ \ERL\_DRV\_BINARY\<\/span\>\\,\<\/span\>\ \\(\<\/span\>\ErlDrvTermData\<\/span\>\\)\<\/span\>\ \output\_bytes\<\/span\>\\,\<\/span\>\ \output\_bytes\<\/span\>\\-\>\;\<\/span\>\orig\_size\<\/span\>\\,\<\/span\>\ \0\<\/span\>\\,\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \ \ \ERL\_DRV\_TUPLE\<\/span\>\\,\<\/span\>\ \2\<\/span\>\\}\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \<\/td\>\<\/tr\>\\\ \ \ \ \driver\_output\_term\<\/span\>\\(\<\/span\>\bdb\_drv\<\/span\>\\-\>\;\<\/span\>\port\<\/span\>\\,\<\/span\>\ \spec\<\/span\>\\,\<\/span\>\ \sizeof\<\/span\>\\(\<\/span\>\spec\<\/span\>\\)\<\/span\>\ \\/\<\/span\>\ \sizeof\<\/span\>\\(\<\/span\>\spec\<\/span\>\\[\<\/span\>\0\<\/span\>\\]\)\)\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \driver\_free\_binary\<\/span\>\\(\<\/span\>\output\_bytes\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \\}\<\/span\>\ \else\<\/span\>\ \\{\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \\/\/\ there\ was\ an\ error\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \char\<\/span\>\ \\*\<\/span\>\error\_reason\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\\<\/td\>\<\/tr\>\\\ \ \ \ \switch\<\/span\>\\(\<\/span\>\status\<\/span\>\\)\<\/span\>\ \\{\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \case\<\/span\>\ \DB\_LOCK\_DEADLOCK\<\/span\>\:\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \error\_reason\<\/span\>\ \\=\<\/span\>\ \\"\;deadlock\"\;\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \break\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \case\<\/span\>\ \DB\_SECONDARY\_BAD\<\/span\>\:\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \error\_reason\<\/span\>\ \\=\<\/span\>\ \\"\;bad\_secondary\_index\"\;\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \break\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \case\<\/span\>\ \ENOMEM\<\/span\>\:\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \error\_reason\<\/span\>\ \\=\<\/span\>\ \\"\;insufficient\_memory\"\;\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \break\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \case\<\/span\>\ \EINVAL\<\/span\>\:\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \error\_reason\<\/span\>\ \\=\<\/span\>\ \\"\;bad\_flag\"\;\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \break\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \case\<\/span\>\ \DB\_RUNRECOVERY\<\/span\>\:\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \error\_reason\<\/span\>\ \\=\<\/span\>\ \\"\;run\_recovery\"\;\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \break\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \default\<\/span\>\\:\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \error\_reason\<\/span\>\ \\=\<\/span\>\ \\"\;unknown\"\;\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \\}\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \<\/td\>\<\/tr\>\\\ \ \ \ \\/\/\ Return\ tuple\ \{error\,\ Reason\}\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ErlDrvTermData\<\/span\>\ \spec\<\/span\>\\[\]\<\/span\>\ \\=\<\/span\>\ \\{\<\/span\>\ERL\_DRV\_ATOM\<\/span\>\\,\<\/span\>\ \driver\_mk\_atom\<\/span\>\\(\<\/span\>\\"\;error\"\;\<\/span\>\\)\,\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \ \ \ERL\_DRV\_ATOM\<\/span\>\\,\<\/span\>\ \driver\_mk\_atom\<\/span\>\\(\<\/span\>\error\_reason\<\/span\>\\)\,\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \ \ \ \ \ERL\_DRV\_TUPLE\<\/span\>\\,\<\/span\>\ \2\<\/span\>\\}\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ \ \driver\_output\_term\<\/span\>\\(\<\/span\>\bdb\_drv\<\/span\>\\-\>\;\<\/span\>\port\<\/span\>\\,\<\/span\>\ \spec\<\/span\>\\,\<\/span\>\ \sizeof\<\/span\>\\(\<\/span\>\spec\<\/span\>\\)\<\/span\>\ \\/\<\/span\>\ \sizeof\<\/span\>\\(\<\/span\>\spec\<\/span\>\\[\<\/span\>\0\<\/span\>\\]\)\)\;\<\/span\>\<\/td\>\<\/tr\>\\\ \ \\}\<\/span\>\<\/td\>\<\/tr\>\\\\}\<\/span\>\<\/td\>\<\/tr\>\<\/table\>\<\/pre\>\<\/td\>\<\/tr\>\<\/table\>\n\n\n
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