git.m6w6.name Git - m6w6/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
  12   *error= memcached_connect(ptr);
  13
  14   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
  15                         key_length, key);
  16   if (*error != MEMCACHED_SUCCESS)
  17     return NULL;
  18
  19   if ((send(ptr->fd, buffer, send_length, 0) == -1))
  20   {
  21     fprintf(stderr, "failed fetch on %.*s TCP\n", key_length+1, key);
  22     *error= MEMCACHED_WRITE_FAILURE;
  23     return NULL;
  24   }
  25
  26   memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
  27   *error= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE);
  28
  29   if (*error == MEMCACHED_SUCCESS)
  30   {
  31     char *end_ptr;
  32
  33     string_ptr= buffer;
  34     string_ptr+= 6; /* "VALUE " */
  35
  36     /* We do nothing with the key, since we only asked for one key */
  37     for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
  38
  39     /* Flags fetch */
  40     string_ptr= end_ptr + 1;
  41     for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
  42     *flags= (uint16_t)strtol(string_ptr, &end_ptr, 10);
  43
  44     /* Length fetch */
  45     string_ptr= end_ptr + 1;
  46     for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
  47     *value_length= strtoll(string_ptr, &end_ptr, 10);
  48
  49     /* Skip past the \r\n */
  50     string_ptr= end_ptr +2;
  51
  52     if (*value_length)
  53     {
  54       size_t need_to_copy;
  55       char *pos_ptr;
  56       char *value;
  57
  58       value= (char *)malloc(*value_length * sizeof(char));
  59
  60       if (!value)
  61       {
  62         *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  63         return NULL;
  64       }
  65
  66       need_to_copy= (*value_length < (size_t)(buffer-string_ptr))
  67         ? *value_length
  68         : (size_t)(buffer-string_ptr) ;
  69
  70       pos_ptr= memcpy(value, string_ptr, need_to_copy);
  71
  72       if ( need_to_copy > *value_length)
  73       {
  74         size_t read_length;
  75         size_t need_to_read;
  76
  77         need_to_read= *value_length - need_to_copy;
  78
  79         read_length= read(ptr->fd, pos_ptr, need_to_read);
  80         if (read_length != need_to_read)
  81         {
  82           free(value);
  83           *error= MEMCACHED_PARTIAL_READ;
  84
  85           return NULL;
  86         }
  87       }
  88
  89       return value;
  90     }
  91   }
  92
  93   return NULL;
  94 }