git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/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= string->root->call_realloc(string->root, 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     memset(string, 0, sizeof(memcached_string_st));
  42   else
  43   {
  44     string= ptr->call_calloc(ptr, 1, sizeof(memcached_string_st));
  45
  46     if (string == NULL)
  47       return NULL;
  48     string->is_allocated= true;
  49   }
  50   string->block_size= MEMCACHED_BLOCK_SIZE;
  51   string->root= ptr;
  52
  53   rc=  memcached_string_check(string, initial_size);
  54   if (rc != MEMCACHED_SUCCESS)
  55   {
  56     ptr->call_free(ptr, string);
  57     return NULL;
  58   }
  59
  60   WATCHPOINT_ASSERT(string->string == string->end);
  61
  62   return string;
  63 }
  64
  65 memcached_return memcached_string_append_character(memcached_string_st *string,
  66                                                    char character)
  67 {
  68   memcached_return rc;
  69
  70   rc=  memcached_string_check(string, 1);
  71
  72   if (rc != MEMCACHED_SUCCESS)
  73     return rc;
  74
  75   *string->end= character;
  76   string->end++;
  77
  78   return MEMCACHED_SUCCESS;
  79 }
  80
  81 memcached_return memcached_string_append(memcached_string_st *string,
  82                                          char *value, size_t length)
  83 {
  84   memcached_return rc;
  85
  86   rc= memcached_string_check(string, length);
  87
  88   if (rc != MEMCACHED_SUCCESS)
  89     return rc;
  90
  91   WATCHPOINT_ASSERT(length <= string->current_size);
  92   WATCHPOINT_ASSERT(string->string);
  93   WATCHPOINT_ASSERT(string->end >= string->string);
  94
  95   memcpy(string->end, value, length);
  96   string->end+= length;
  97
  98   return MEMCACHED_SUCCESS;
  99 }
 100
 101 char *memcached_string_c_copy(memcached_string_st *string)
 102 {
 103   char *c_ptr;
 104
 105   if (memcached_string_length(string) == 0)
 106     return NULL;
 107
 108   c_ptr= string->root->call_malloc(string->root, (memcached_string_length(string)+1) * sizeof(char));
 109
 110   if (c_ptr == NULL)
 111     return NULL;
 112
 113   memcpy(c_ptr, memcached_string_value(string), memcached_string_length(string));
 114   c_ptr[memcached_string_length(string)]= 0;
 115
 116   return c_ptr;
 117 }
 118
 119 memcached_return memcached_string_reset(memcached_string_st *string)
 120 {
 121   string->end= string->string;
 122
 123   return MEMCACHED_SUCCESS;
 124 }
 125
 126 void memcached_string_free(memcached_string_st *ptr)
 127 {
 128   if (ptr == NULL)
 129     return;
 130
 131   if (ptr->string)
 132     ptr->root->call_free(ptr->root, ptr->string);
 133
 134   if (ptr->is_allocated)
 135     ptr->root->call_free(ptr->root, ptr);
 136   else
 137     memset(ptr, 0, sizeof(memcached_string_st));
 138 }