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

   1 #include "common.h"
   2
   3 memcached_return memcached_string_check(memcached_string_st *string, size_t need)
   4 {
   5   if (need && need > (size_t)(string->current_size - (size_t)(string->end - string->string)))
   6   {
   7     size_t current_offset= string->end - string->string;
   8     char *new_value;
   9     size_t adjust;
  10     size_t new_size;
  11
  12     /* This is the block multiplier. To keep it larger and surive division errors we must round it up */
  13     adjust= (need - (size_t)(string->current_size - (size_t)(string->end - string->string))) / string->block_size;
  14     adjust++;
  15
  16     new_size= sizeof(char) * (size_t)((adjust * string->block_size) + string->current_size);
  17     /* Test for overflow */
  18     if (new_size < need)
  19       return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  20
  21     new_value= (char *)realloc(string->string, new_size);
  22
  23     if (new_value == NULL)
  24       return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  25
  26     string->string= new_value;
  27     string->end= string->string + current_offset;
  28
  29     string->current_size+= (string->block_size * adjust);
  30   }
  31
  32   return MEMCACHED_SUCCESS;
  33 }
  34
  35 memcached_string_st *memcached_string_create(memcached_st *ptr, memcached_string_st *string, size_t initial_size)
  36 {
  37   memcached_return rc;
  38
  39   /* Saving malloc calls :) */
  40   if (string)
  41   {
  42     memset(string, 0, sizeof(memcached_string_st));
  43     string->is_allocated= MEMCACHED_NOT_ALLOCATED;
  44   }
  45   else
  46   {
  47     string= (memcached_string_st *)malloc(sizeof(memcached_string_st));
  48     if (!string)
  49       return NULL;
  50     memset(string, 0, sizeof(memcached_string_st));
  51     string->is_allocated= MEMCACHED_ALLOCATED;
  52   }
  53   string->block_size= MEMCACHED_BLOCK_SIZE;
  54   string->root= ptr;
  55
  56   rc=  memcached_string_check(string, initial_size);
  57   if (rc != MEMCACHED_SUCCESS)
  58   {
  59     free(string);
  60     return NULL;
  61   }
  62
  63   WATCHPOINT_ASSERT(string->string == string->end);
  64
  65   return string;
  66 }
  67
  68 memcached_return memcached_string_append_character(memcached_string_st *string,
  69                                                    char character)
  70 {
  71   memcached_return rc;
  72
  73   rc=  memcached_string_check(string, 1);
  74
  75   if (rc != MEMCACHED_SUCCESS)
  76     return rc;
  77
  78   *string->end= ' ';
  79   string->end++;
  80
  81   return MEMCACHED_SUCCESS;
  82 }
  83
  84 memcached_return memcached_string_append(memcached_string_st *string,
  85                                          char *value, size_t length)
  86 {
  87   memcached_return rc;
  88
  89   rc= memcached_string_check(string, length);
  90
  91   if (rc != MEMCACHED_SUCCESS)
  92     return rc;
  93
  94   WATCHPOINT_ASSERT(length <= string->current_size);
  95   WATCHPOINT_ASSERT(string->string);
  96   WATCHPOINT_ASSERT(string->end >= string->string);
  97
  98   memcpy(string->end, value, length);
  99   string->end+= length;
 100
 101   return MEMCACHED_SUCCESS;
 102 }
 103
 104 size_t memcached_string_backspace(memcached_string_st *string, size_t remove)
 105 {
 106   if (string->end - string->string  > remove)
 107   {
 108     size_t difference;
 109
 110     difference= string->end - string->string;
 111     string->end= string->string;
 112
 113     return difference;
 114   }
 115   string->end-= remove;
 116
 117   return remove;
 118 }
 119
 120 char *memcached_string_c_copy(memcached_string_st *string)
 121 {
 122   char *c_ptr;
 123   c_ptr= (char *)malloc(memcached_string_length(string) * sizeof(char));
 124   if (!c_ptr)
 125     return NULL;
 126
 127   memcpy(c_ptr, memcached_string_value(string), memcached_string_length(string));
 128
 129   return c_ptr;
 130 }
 131
 132 memcached_return memcached_string_reset(memcached_string_st *string)
 133 {
 134   string->end= string->string;
 135
 136   return MEMCACHED_SUCCESS;
 137 }
 138
 139 void memcached_string_free(memcached_string_st *string)
 140 {
 141   if (string->string)
 142     free(string->string);
 143   if (string->is_allocated == MEMCACHED_ALLOCATED)
 144     free(string);
 145 }