git.m6w6.name Git - awesomized/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     if (string->root->call_realloc)
  22       new_value= (char *)string->root->call_realloc(string->root, string->string, new_size);
  23     else
  24       new_value= (char *)realloc(string->string, new_size);
  25
  26     if (new_value == NULL)
  27       return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  28
  29     string->string= new_value;
  30     string->end= string->string + current_offset;
  31
  32     string->current_size+= (string->block_size * adjust);
  33   }
  34
  35   return MEMCACHED_SUCCESS;
  36 }
  37
  38 memcached_string_st *memcached_string_create(memcached_st *ptr, memcached_string_st *string, size_t initial_size)
  39 {
  40   memcached_return rc;
  41
  42   /* Saving malloc calls :) */
  43   if (string)
  44     memset(string, 0, sizeof(memcached_string_st));
  45   else
  46   {
  47     if (ptr->call_malloc)
  48       string= (memcached_string_st *)ptr->call_malloc(ptr, sizeof(memcached_string_st));
  49     else
  50       string= (memcached_string_st *)malloc(sizeof(memcached_string_st));
  51
  52     if (string == NULL)
  53       return NULL;
  54     memset(string, 0, sizeof(memcached_string_st));
  55     string->is_allocated= true;
  56   }
  57   string->block_size= MEMCACHED_BLOCK_SIZE;
  58   string->root= ptr;
  59
  60   rc=  memcached_string_check(string, initial_size);
  61   if (rc != MEMCACHED_SUCCESS)
  62   {
  63     if (ptr->call_free)
  64       ptr->call_free(ptr, string);
  65     else
  66       free(string);
  67
  68     return NULL;
  69   }
  70
  71   WATCHPOINT_ASSERT(string->string == string->end);
  72
  73   return string;
  74 }
  75
  76 memcached_return memcached_string_append_character(memcached_string_st *string,
  77                                                    char character)
  78 {
  79   memcached_return rc;
  80
  81   rc=  memcached_string_check(string, 1);
  82
  83   if (rc != MEMCACHED_SUCCESS)
  84     return rc;
  85
  86   *string->end= character;
  87   string->end++;
  88
  89   return MEMCACHED_SUCCESS;
  90 }
  91
  92 memcached_return memcached_string_append(memcached_string_st *string,
  93                                          char *value, size_t length)
  94 {
  95   memcached_return rc;
  96
  97   rc= memcached_string_check(string, length);
  98
  99   if (rc != MEMCACHED_SUCCESS)
 100     return rc;
 101
 102   WATCHPOINT_ASSERT(length <= string->current_size);
 103   WATCHPOINT_ASSERT(string->string);
 104   WATCHPOINT_ASSERT(string->end >= string->string);
 105
 106   memcpy(string->end, value, length);
 107   string->end+= length;
 108
 109   return MEMCACHED_SUCCESS;
 110 }
 111
 112 char *memcached_string_c_copy(memcached_string_st *string)
 113 {
 114   char *c_ptr;
 115
 116   if (memcached_string_length(string) == 0)
 117     return NULL;
 118
 119   if (string->root->call_malloc)
 120     c_ptr= (char *)string->root->call_malloc(string->root, (memcached_string_length(string)+1) * sizeof(char));
 121   else
 122     c_ptr= (char *)malloc((memcached_string_length(string)+1) * sizeof(char));
 123
 124   if (c_ptr == NULL)
 125     return NULL;
 126
 127   memcpy(c_ptr, memcached_string_value(string), memcached_string_length(string));
 128   c_ptr[memcached_string_length(string)]= 0;
 129
 130   return c_ptr;
 131 }
 132
 133 memcached_return memcached_string_reset(memcached_string_st *string)
 134 {
 135   string->end= string->string;
 136
 137   return MEMCACHED_SUCCESS;
 138 }
 139
 140 void memcached_string_free(memcached_string_st *ptr)
 141 {
 142   if (ptr == NULL)
 143     return;
 144
 145   if (ptr->string)
 146   {
 147     if (ptr->root->call_free)
 148       ptr->root->call_free(ptr->root, ptr->string);
 149     else
 150       free(ptr->string);
 151   }
 152
 153   if (ptr->is_allocated)
 154   {
 155     if (ptr->root->call_free)
 156       ptr->root->call_free(ptr->root, ptr);
 157     else
 158       free(ptr);
 159   }
 160   else
 161     memset(ptr, 0, sizeof(memcached_string_st));
 162 }