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 self
->options
.is_allocated
= false;
95 self
= static_cast<memcached_string_st
*>(libmemcached_malloc(memc
, sizeof(memcached_string_st
)));
102 self
->options
.is_allocated
= true;
108 if (memcached_failed(_string_check(self
, initial_size
)))
110 libmemcached_free(memc
, self
);
115 self
->options
.is_initialized
= true;
117 WATCHPOINT_ASSERT(self
->string
== self
->end
);
122 static memcached_return_t
memcached_string_append_null(memcached_string_st
*string
)
124 if (memcached_failed(_string_check(string
, 1)))
126 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
131 return MEMCACHED_SUCCESS
;
134 memcached_return_t
memcached_string_append_character(memcached_string_st
*string
,
137 if (memcached_failed(_string_check(string
, 1)))
139 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
142 *string
->end
= character
;
145 return MEMCACHED_SUCCESS
;
148 memcached_return_t
memcached_string_append(memcached_string_st
*string
,
149 const char *value
, size_t length
)
151 if (memcached_failed(_string_check(string
, length
)))
153 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
156 WATCHPOINT_ASSERT(length
<= string
->current_size
);
157 WATCHPOINT_ASSERT(string
->string
);
158 WATCHPOINT_ASSERT(string
->end
>= string
->string
);
160 memcpy(string
->end
, value
, length
);
161 string
->end
+= length
;
163 return MEMCACHED_SUCCESS
;
166 char *memcached_string_c_copy(memcached_string_st
*string
)
168 if (not memcached_string_length(string
))
171 char *c_ptr
= static_cast<char *>(libmemcached_malloc(string
->root
, (memcached_string_length(string
)+1) * sizeof(char)));
176 memcpy(c_ptr
, memcached_string_value(string
), memcached_string_length(string
));
177 c_ptr
[memcached_string_length(string
)]= 0;
182 memcached_return_t
memcached_string_reset(memcached_string_st
*string
)
184 string
->end
= string
->string
;
186 return MEMCACHED_SUCCESS
;
189 void memcached_string_free(memcached_string_st
*ptr
)
196 libmemcached_free(ptr
->root
, ptr
->string
);
199 if (memcached_is_allocated(ptr
))
201 libmemcached_free(ptr
->root
, ptr
);
205 ptr
->options
.is_initialized
= false;
209 memcached_return_t
memcached_string_check(memcached_string_st
*string
, size_t need
)
211 return _string_check(string
, need
);
214 size_t memcached_string_length(const memcached_string_st
*self
)
216 return (size_t)(self
->end
- self
->string
);
219 size_t memcached_string_size(const memcached_string_st
*self
)
221 return self
->current_size
;
224 const char *memcached_string_value(const memcached_string_st
*self
)
229 char *memcached_string_take_value(memcached_string_st
*self
)
232 // If we fail at adding the null, we copy and move on
233 if (memcached_success(memcached_string_append_null(self
)))
235 return memcached_string_c_copy(self
);
238 char *value
= self
->string
;
245 char *memcached_string_value_mutable(const memcached_string_st
*self
)
250 void memcached_string_set_length(memcached_string_st
*self
, size_t length
)
252 self
->end
= self
->string
+ length
;