1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
5 * Copyright (C) 2011 Data Differential, http://datadifferential.com/
6 * Copyright (C) 2006-2009 Brian Aker All rights reserved.
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39 #include <libmemcached/common.h>
42 inline static memcached_return_t
_string_check(memcached_string_st
*string
, size_t need
)
44 if (need
&& need
> (size_t)(string
->current_size
- (size_t)(string
->end
- string
->string
)))
46 size_t current_offset
= (size_t) (string
->end
- string
->string
);
51 /* This is the block multiplier. To keep it larger and surive division errors we must round it up */
52 adjust
= (need
- (size_t)(string
->current_size
- (size_t)(string
->end
- string
->string
))) / MEMCACHED_BLOCK_SIZE
;
55 new_size
= sizeof(char) * (size_t)((adjust
* MEMCACHED_BLOCK_SIZE
) + string
->current_size
);
56 /* Test for overflow */
58 return memcached_set_error(*string
->root
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
);
60 new_value
= static_cast<char *>(libmemcached_realloc(string
->root
, string
->string
, new_size
));
64 return memcached_set_error(*string
->root
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
);
67 string
->string
= new_value
;
68 string
->end
= string
->string
+ current_offset
;
70 string
->current_size
+= (MEMCACHED_BLOCK_SIZE
* adjust
);
73 return MEMCACHED_SUCCESS
;
76 static inline void _init_string(memcached_string_st
*self
)
78 self
->current_size
= 0;
79 self
->end
= self
->string
= NULL
;
82 memcached_string_st
*memcached_string_create(memcached_st
*memc
, memcached_string_st
*self
, size_t initial_size
)
84 WATCHPOINT_ASSERT(memc
);
86 /* Saving malloc calls :) */
89 WATCHPOINT_ASSERT(self
->options
.is_initialized
== false);
91 memcached_set_allocated(self
, false);
95 self
= static_cast<memcached_string_st
*>(libmemcached_malloc(memc
, sizeof(memcached_string_st
)));
102 memcached_set_allocated(self
, true);
108 if (memcached_failed(_string_check(self
, initial_size
)))
110 if (memcached_is_allocated(self
))
112 libmemcached_free(memc
, self
);
118 self
->options
.is_initialized
= true;
120 WATCHPOINT_ASSERT(self
->string
== self
->end
);
125 static memcached_return_t
memcached_string_append_null(memcached_string_st
*string
)
127 if (memcached_failed(_string_check(string
, 1)))
129 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
134 return MEMCACHED_SUCCESS
;
137 memcached_return_t
memcached_string_append_character(memcached_string_st
*string
,
140 if (memcached_failed(_string_check(string
, 1)))
142 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
145 *string
->end
= character
;
148 return MEMCACHED_SUCCESS
;
151 memcached_return_t
memcached_string_append(memcached_string_st
*string
,
152 const char *value
, size_t length
)
154 if (memcached_failed(_string_check(string
, length
)))
156 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
159 WATCHPOINT_ASSERT(length
<= string
->current_size
);
160 WATCHPOINT_ASSERT(string
->string
);
161 WATCHPOINT_ASSERT(string
->end
>= string
->string
);
163 memcpy(string
->end
, value
, length
);
164 string
->end
+= length
;
166 return MEMCACHED_SUCCESS
;
169 char *memcached_string_c_copy(memcached_string_st
*string
)
171 if (not memcached_string_length(string
))
174 char *c_ptr
= static_cast<char *>(libmemcached_malloc(string
->root
, (memcached_string_length(string
)+1) * sizeof(char)));
179 memcpy(c_ptr
, memcached_string_value(string
), memcached_string_length(string
));
180 c_ptr
[memcached_string_length(string
)]= 0;
185 memcached_return_t
memcached_string_reset(memcached_string_st
*string
)
187 string
->end
= string
->string
;
189 return MEMCACHED_SUCCESS
;
192 void memcached_string_free(memcached_string_st
*ptr
)
199 libmemcached_free(ptr
->root
, ptr
->string
);
202 if (memcached_is_allocated(ptr
))
204 libmemcached_free(ptr
->root
, ptr
);
208 ptr
->options
.is_initialized
= false;
212 memcached_return_t
memcached_string_check(memcached_string_st
*string
, size_t need
)
214 return _string_check(string
, need
);
217 size_t memcached_string_length(const memcached_string_st
*self
)
219 return (size_t)(self
->end
- self
->string
);
222 size_t memcached_string_size(const memcached_string_st
*self
)
224 return self
->current_size
;
227 const char *memcached_string_value(const memcached_string_st
*self
)
232 char *memcached_string_take_value(memcached_string_st
*self
)
235 // If we fail at adding the null, we copy and move on
236 if (memcached_success(memcached_string_append_null(self
)))
238 return memcached_string_c_copy(self
);
241 char *value
= self
->string
;
248 char *memcached_string_value_mutable(const memcached_string_st
*self
)
253 void memcached_string_set_length(memcached_string_st
*self
, size_t length
)
255 self
->end
= self
->string
+ length
;