/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Libmemcached library
*
* Copyright (C) 2011 Data Differential, http://datadifferential.com/
* Copyright (C) 2006-2009 Brian Aker All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * The names of its contributors may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <libmemcached/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);
/* This is the block multiplier. To keep it larger and surive division errors we must round it up */
size_t adjust= (need - (size_t)(string->current_size - (size_t)(string->end - string->string))) / MEMCACHED_BLOCK_SIZE;
adjust++;
size_t new_size= sizeof(char) * (size_t)((adjust * MEMCACHED_BLOCK_SIZE) + string->current_size);
/* Test for overflow */
if (new_size < need)
{
char error_message[1024];
int error_message_length= snprintf(error_message, sizeof(error_message),"Needed %ld, got %ld", (long)need, (long)new_size);
return memcached_set_error(*string->root, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT, error_message, error_message_length);
}
char *new_value= libmemcached_xrealloc(string->root, string->string, new_size, char);
if (new_value == NULL)
{
return memcached_set_error(*string->root, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT);
}
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(Memcached *memc, memcached_string_st *self, size_t initial_size)
{
WATCHPOINT_ASSERT(memc);
/* Saving malloc calls :) */
if (self)
{
WATCHPOINT_ASSERT(self->options.is_initialized == false);
memcached_set_allocated(self, false);
}
else
{
self= libmemcached_xmalloc(memc, memcached_string_st);
if (self == NULL)
{
return NULL;
}
memcached_set_allocated(self, true);
}
self->root= memc;
_init_string(self);
if (memcached_failed(_string_check(self, initial_size)))
{
if (memcached_is_allocated(self))
{
libmemcached_free(memc, self);
}
return NULL;
}
memcached_set_initialized(self, true);
WATCHPOINT_ASSERT(self->string == self->end);
return self;
}
static memcached_return_t memcached_string_append_null(memcached_string_st& string)
{
if (memcached_failed(_string_check(&string, 1)))
{
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
}
*string.end= 0;
return MEMCACHED_SUCCESS;
}
static memcached_return_t memcached_string_append_null(memcached_string_st *string)
{
if (memcached_failed(_string_check(string, 1)))
{
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
}
*string->end= 0;
return MEMCACHED_SUCCESS;
}
memcached_return_t memcached_string_append_character(memcached_string_st *string,
char character)
{
if (memcached_failed(_string_check(string, 1)))
{
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
}
*string->end= character;
string->end++;
return MEMCACHED_SUCCESS;
}
memcached_return_t memcached_string_append(memcached_string_st *string,
const char *value, size_t length)
{
if (memcached_failed(_string_check(string, length)))
{
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
}
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)
{
if (memcached_string_length(string) == 0)
{
return NULL;
}
char *c_ptr= static_cast<char *>(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;
}
bool memcached_string_set(memcached_string_st& string, const char* value, size_t length)
{
memcached_string_reset(&string);
if (memcached_success(memcached_string_append(&string, value, length)))
{
memcached_string_append_null(string);
return true;
}
return false;
}
void memcached_string_reset(memcached_string_st *string)
{
string->end= string->string;
}
void memcached_string_free(memcached_string_st& ptr)
{
memcached_string_free(&ptr);
}
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);
}
bool memcached_string_resize(memcached_string_st& string, const size_t need)
{
return memcached_success(_string_check(&string, need));
}
size_t memcached_string_length(const memcached_string_st *self)
{
return size_t(self->end -self->string);
}
size_t memcached_string_length(const memcached_string_st& self)
{
return size_t(self.end -self.string);
}
size_t memcached_string_size(const memcached_string_st *self)
{
return self->current_size;
}
const char *memcached_string_value(const memcached_string_st *self)
{
return self->string;
}
const char *memcached_string_value(const memcached_string_st& self)
{
return self.string;
}
char *memcached_string_take_value(memcached_string_st *self)
{
char* value= NULL;
assert_msg(self, "Invalid memcached_string_st");
if (self)
{
if (memcached_string_length(self))
{
// If we fail at adding the null, we copy and move on
if (memcached_failed(memcached_string_append_null(self)))
{
return NULL;
}
value= self->string;
_init_string(self);
}
}
return value;
}
char *memcached_string_value_mutable(const memcached_string_st *self)
{
return self->string;
}
char *memcached_string_c_str(memcached_string_st& self)
{
return self.string;
}
void memcached_string_set_length(memcached_string_st *self, size_t length)
{
self->end= self->string +length;
}
void memcached_string_set_length(memcached_string_st& self, const size_t length)
{
assert(self.current_size >= length);
size_t set_length= length;
if (self.current_size > length)
{
if (memcached_failed(_string_check(&self, length)))
{
set_length= self.current_size;
}
}
self.end= self.string +set_length;
}