git.m6w6.name Git - m6w6/libmemcached/blob - lib/memcached_auto.c

   1 #include "common.h"
   2
   3 static memcached_return memcached_auto(memcached_st *ptr,
   4                                        char *verb,
   5                                        char *key, size_t key_length,
   6                                        unsigned int offset,
   7                                        uint64_t *value)
   8 {
   9   size_t send_length;
  10   memcached_return rc;
  11   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  12   unsigned int server_key;
  13
  14   if (key_length == 0)
  15     return MEMCACHED_NO_KEY_PROVIDED;
  16
  17   if (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  18     return MEMCACHED_NO_SERVERS;
  19
  20   server_key= memcached_generate_hash(ptr, key, key_length);
  21
  22   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  23                         "%s %.*s %u\r\n", verb,
  24                         (int)key_length, key,
  25                         offset);
  26   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  27     return MEMCACHED_WRITE_FAILURE;
  28
  29   rc= memcached_do(ptr, server_key, buffer, send_length, 1);
  30   if (rc != MEMCACHED_SUCCESS)
  31     return rc;
  32
  33   memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
  34
  35   rc= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
  36
  37   /*
  38     So why recheck responce? Because the protocol is brain dead :)
  39     The number returned might end up equaling one of the string
  40     values. Less chance of a mistake with memcmp() so we will
  41     use it. We still called memcached_response() though since it
  42     worked its magic for non-blocking IO.
  43   */
  44   if (!memcmp(buffer, "ERROR\r\n", MEMCACHED_DEFAULT_COMMAND_SIZE))
  45   {
  46     *value= 0;
  47     rc= MEMCACHED_PROTOCOL_ERROR;
  48   }
  49   else if (!memcmp(buffer, "NOT_FOUND\r\n", MEMCACHED_DEFAULT_COMMAND_SIZE))
  50   {
  51     *value= 0;
  52     rc= MEMCACHED_NOTFOUND;
  53   }
  54   else
  55   {
  56     *value= (uint64_t)strtoll(buffer, (char **)NULL, 10);
  57     rc= MEMCACHED_SUCCESS;
  58   }
  59
  60   return rc;
  61 }
  62
  63 memcached_return memcached_increment(memcached_st *ptr,
  64                                      char *key, size_t key_length,
  65                                      unsigned int offset,
  66                                      uint64_t *value)
  67 {
  68   memcached_return rc;
  69
  70   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
  71   rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
  72   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
  73
  74   return rc;
  75 }
  76
  77 memcached_return memcached_decrement(memcached_st *ptr,
  78                                      char *key, size_t key_length,
  79                                      unsigned int offset,
  80                                      uint64_t *value)
  81 {
  82   memcached_return rc;
  83
  84   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
  85   rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
  86   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
  87
  88   return rc;
  89 }