Drizzled Public API Documentation

memc_decrement.cc

00001 /* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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00003  *
00004  * Copyright (C) 2009, Patrick "CaptTofu" Galbraith, Padraig O'Sullivan
00005  * All rights reserved.
00006  *
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions are met:
00009  *
00010  *   * Redistributions of source code must retain the above copyright notice,
00011  *     this list of conditions and the following disclaimer.
00012  *   * Redistributions in binary form must reproduce the above copyright notice,
00013  *     this list of conditions and the following disclaimer in the documentation
00014  *     and/or other materials provided with the distribution.
00015  *   * Neither the name of Patrick Galbraith nor the names of its contributors
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00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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00031 
00032 #include <config.h>
00033 #include <drizzled/function/str/strfunc.h>
00034 
00035 #include "memcached_functions.h"
00036 #include "memc_decrement.h"
00037 
00038 #include <libmemcached/memcached.h>
00039 
00040 #include <string>
00041 
00042 using namespace std;
00043 using namespace drizzled;
00044 
00045 String *MemcachedDecrement::val_str(String *str)
00046 {
00047   memcached_return rc;
00048   uint32_t offset;
00049   uint64_t value;
00050   size_t val_len;
00051   char tmp_buff[32]= "";
00052   String *key;
00053   String *dec_str;
00054   null_value= false;
00055 
00056   if ((arg_count != 1 && arg_count != 2) ||
00057       ! (key= args[0]->val_str(str)) ||
00058       ! memc)
00059   {
00060     return &failure_buff;
00061   }
00062 
00063   if (arg_count == 2) {
00064     dec_str= args[1]->val_str(str);
00065     offset= static_cast<uint32_t>(atoi(dec_str->c_ptr()));
00066   }
00067   else
00068   {
00069     offset= 1;
00070   }
00071 
00072   rc= memcached_decrement(memc,
00073                     key->c_ptr(),
00074                     key->length(),
00075                     offset,
00076                     &value);
00077 
00078   snprintf(tmp_buff, 32, "%"PRIu64, value);
00079   val_len= strlen(tmp_buff);
00080 
00081   if (rc != MEMCACHED_SUCCESS)
00082   {
00083     return &failure_buff;
00084   }
00085 
00086   buffer.realloc(val_len);
00087   buffer.length(val_len);
00088   memcpy(buffer.ptr(), tmp_buff, val_len);
00089 
00090   return &buffer;
00091 }
00092