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/* LibMemcached
* Copyright (C) 2006-2009 Brian Aker
* All rights reserved.
*
* Use and distribution licensed under the BSD license. See
* the COPYING file in the parent directory for full text.
*
* Summary: String structure used for libmemcached.
*
*/
#include "common.h"
inline static memcached_return_t _string_check(memcached_string_st *string, size_t need)
{
if (need && need > (size_t)(string->current_size - (size_t)(string->end - string->string)))
{
size_t current_offset= (size_t) (string->end - string->string);
char *new_value;
size_t adjust;
size_t new_size;
/* This is the block multiplier. To keep it larger and surive division errors we must round it up */
adjust= (need - (size_t)(string->current_size - (size_t)(string->end - string->string))) / MEMCACHED_BLOCK_SIZE;
adjust++;
new_size= sizeof(char) * (size_t)((adjust * MEMCACHED_BLOCK_SIZE) + string->current_size);
/* Test for overflow */
if (new_size < need)
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
new_value= libmemcached_realloc(string->root, string->string, new_size);
if (new_value == NULL)
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
string->string= new_value;
string->end= string->string + current_offset;
string->current_size+= (MEMCACHED_BLOCK_SIZE * adjust);
}
return MEMCACHED_SUCCESS;
}
static inline void _init_string(memcached_string_st *self)
{
self->current_size= 0;
self->end= self->string= NULL;
}
memcached_string_st *memcached_string_create(const memcached_st *memc, memcached_string_st *self, size_t initial_size)
{
memcached_return_t rc;
WATCHPOINT_ASSERT(memc);
/* Saving malloc calls :) */
if (self)
{
WATCHPOINT_ASSERT(self->options.is_initialized == false);
self->options.is_allocated= false;
}
else
{
self= libmemcached_malloc(memc, sizeof(memcached_string_st));
if (self == NULL)
{
return NULL;
}
self->options.is_allocated= true;
}
self->root= memc;
_init_string(self);
rc= _string_check(self, initial_size);
if (rc != MEMCACHED_SUCCESS)
{
libmemcached_free(memc, self);
return NULL;
}
self->options.is_initialized= true;
WATCHPOINT_ASSERT(self->string == self->end);
return self;
}
memcached_return_t memcached_string_append_character(memcached_string_st *string,
char character)
{
memcached_return_t rc;
rc= _string_check(string, 1);
if (rc != MEMCACHED_SUCCESS)
return rc;
*string->end= character;
string->end++;
return MEMCACHED_SUCCESS;
}
memcached_return_t memcached_string_append(memcached_string_st *string,
const char *value, size_t length)
{
memcached_return_t rc;
rc= _string_check(string, length);
if (rc != MEMCACHED_SUCCESS)
return rc;
WATCHPOINT_ASSERT(length <= string->current_size);
WATCHPOINT_ASSERT(string->string);
WATCHPOINT_ASSERT(string->end >= string->string);
memcpy(string->end, value, length);
string->end+= length;
return MEMCACHED_SUCCESS;
}
char *memcached_string_c_copy(memcached_string_st *string)
{
char *c_ptr;
if (memcached_string_length(string) == 0)
return NULL;
c_ptr= libmemcached_malloc(string->root, (memcached_string_length(string)+1) * sizeof(char));
if (c_ptr == NULL)
return NULL;
memcpy(c_ptr, memcached_string_value(string), memcached_string_length(string));
c_ptr[memcached_string_length(string)]= 0;
return c_ptr;
}
memcached_return_t memcached_string_reset(memcached_string_st *string)
{
string->end= string->string;
return MEMCACHED_SUCCESS;
}
void memcached_string_free(memcached_string_st *ptr)
{
if (ptr == NULL)
return;
if (ptr->string)
{
libmemcached_free(ptr->root, ptr->string);
}
if (memcached_is_allocated(ptr))
{
libmemcached_free(ptr->root, ptr);
}
else
{
ptr->options.is_initialized= false;
}
}
memcached_return_t memcached_string_check(memcached_string_st *string, size_t need)
{
return _string_check(string, need);
}
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