git.m6w6.name Git - awesomized/libmemcached/blob - lib/memcached_get.c

   1 #include <memcached.h>
   2
   3 char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
   4                     size_t *value_length,
   5                     uint16_t *flags,
   6                     memcached_return *error)
   7 {
   8   size_t send_length;
   9   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  10   char *string_ptr;
  11   unsigned int server_key;
  12
  13   *error= memcached_connect(ptr);
  14
  15   if (*error != MEMCACHED_SUCCESS)
  16     return NULL;
  17
  18   server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
  19
  20   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
  21                         key_length, key);
  22   if (*error != MEMCACHED_SUCCESS)
  23     return NULL;
  24
  25   if ((send(ptr->hosts[server_key].fd, buffer, send_length, 0) == -1))
  26   {
  27     fprintf(stderr, "failed fetch on %.*s TCP\n", key_length+1, key);
  28     *error= MEMCACHED_WRITE_FAILURE;
  29     return NULL;
  30   }
  31
  32   memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
  33   *error= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
  34
  35   if (*error == MEMCACHED_SUCCESS)
  36   {
  37     char *end_ptr;
  38
  39     string_ptr= buffer;
  40     string_ptr+= 6; /* "VALUE " */
  41
  42     /* We do nothing with the key, since we only asked for one key */
  43     for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
  44
  45     /* Flags fetch */
  46     string_ptr= end_ptr + 1;
  47     for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
  48     *flags= (uint16_t)strtol(string_ptr, &end_ptr, 10);
  49
  50     /* Length fetch */
  51     string_ptr= end_ptr + 1;
  52     for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
  53     *value_length= strtoll(string_ptr, &end_ptr, 10);
  54
  55     /* Skip past the \r\n */
  56     string_ptr= end_ptr +2;
  57
  58     if (*value_length)
  59     {
  60       size_t need_to_copy;
  61       char *pos_ptr;
  62       char *value;
  63
  64       value= (char *)malloc(*value_length * sizeof(char));
  65
  66       if (!value)
  67       {
  68         *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  69         return NULL;
  70       }
  71
  72       need_to_copy= (*value_length < (size_t)(buffer-string_ptr))
  73         ? *value_length
  74         : (size_t)(buffer-string_ptr) ;
  75
  76       pos_ptr= memcpy(value, string_ptr, need_to_copy);
  77
  78       if ( need_to_copy > *value_length)
  79       {
  80         size_t read_length;
  81         size_t need_to_read;
  82
  83         need_to_read= *value_length - need_to_copy;
  84
  85         read_length= read(ptr->hosts[server_key].fd, pos_ptr, need_to_read);
  86         if (read_length != need_to_read)
  87         {
  88           free(value);
  89           *error= MEMCACHED_PARTIAL_READ;
  90
  91           return NULL;
  92         }
  93       }
  94
  95       return value;
  96     }
  97   }
  98
  99   return NULL;
 100 }