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>
41 inline static memcached_return_t
_string_check(memcached_string_st
*string
, size_t need
)
43 if (need
&& need
> (size_t)(string
->current_size
- (size_t)(string
->end
- string
->string
)))
45 size_t current_offset
= (size_t) (string
->end
- string
->string
);
50 /* This is the block multiplier. To keep it larger and surive division errors we must round it up */
51 adjust
= (need
- (size_t)(string
->current_size
- (size_t)(string
->end
- string
->string
))) / MEMCACHED_BLOCK_SIZE
;
54 new_size
= sizeof(char) * (size_t)((adjust
* MEMCACHED_BLOCK_SIZE
) + string
->current_size
);
55 /* Test for overflow */
57 return memcached_set_error(*string
->root
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
);
59 new_value
= static_cast<char *>(libmemcached_realloc(string
->root
, string
->string
, new_size
));
63 return memcached_set_error(*string
->root
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
);
66 string
->string
= new_value
;
67 string
->end
= string
->string
+ current_offset
;
69 string
->current_size
+= (MEMCACHED_BLOCK_SIZE
* adjust
);
72 return MEMCACHED_SUCCESS
;
75 static inline void _init_string(memcached_string_st
*self
)
77 self
->current_size
= 0;
78 self
->end
= self
->string
= NULL
;
81 memcached_string_st
*memcached_string_create(memcached_st
*memc
, memcached_string_st
*self
, size_t initial_size
)
83 WATCHPOINT_ASSERT(memc
);
85 /* Saving malloc calls :) */
88 WATCHPOINT_ASSERT(self
->options
.is_initialized
== false);
90 self
->options
.is_allocated
= false;
94 self
= static_cast<memcached_string_st
*>(libmemcached_malloc(memc
, sizeof(memcached_string_st
)));
101 self
->options
.is_allocated
= true;
107 if (memcached_failed(_string_check(self
, initial_size
)))
109 libmemcached_free(memc
, self
);
114 self
->options
.is_initialized
= true;
116 WATCHPOINT_ASSERT(self
->string
== self
->end
);
121 memcached_return_t
memcached_string_append_character(memcached_string_st
*string
,
124 if (memcached_failed(_string_check(string
, 1)))
126 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
129 *string
->end
= character
;
132 return MEMCACHED_SUCCESS
;
135 memcached_return_t
memcached_string_append(memcached_string_st
*string
,
136 const char *value
, size_t length
)
138 if (memcached_failed(_string_check(string
, length
)))
140 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
143 WATCHPOINT_ASSERT(length
<= string
->current_size
);
144 WATCHPOINT_ASSERT(string
->string
);
145 WATCHPOINT_ASSERT(string
->end
>= string
->string
);
147 memcpy(string
->end
, value
, length
);
148 string
->end
+= length
;
150 return MEMCACHED_SUCCESS
;
153 char *memcached_string_c_copy(memcached_string_st
*string
)
155 if (not memcached_string_length(string
))
158 char *c_ptr
= static_cast<char *>(libmemcached_malloc(string
->root
, (memcached_string_length(string
)+1) * sizeof(char)));
163 memcpy(c_ptr
, memcached_string_value(string
), memcached_string_length(string
));
164 c_ptr
[memcached_string_length(string
)]= 0;
169 memcached_return_t
memcached_string_reset(memcached_string_st
*string
)
171 string
->end
= string
->string
;
173 return MEMCACHED_SUCCESS
;
176 void memcached_string_free(memcached_string_st
*ptr
)
183 libmemcached_free(ptr
->root
, ptr
->string
);
186 if (memcached_is_allocated(ptr
))
188 libmemcached_free(ptr
->root
, ptr
);
192 ptr
->options
.is_initialized
= false;
196 memcached_return_t
memcached_string_check(memcached_string_st
*string
, size_t need
)
198 return _string_check(string
, need
);
201 size_t memcached_string_length(const memcached_string_st
*self
)
203 return (size_t)(self
->end
- self
->string
);
206 size_t memcached_string_size(const memcached_string_st
*self
)
208 return self
->current_size
;
211 const char *memcached_string_value(const memcached_string_st
*self
)
216 char *memcached_string_value_mutable(const memcached_string_st
*self
)
221 void memcached_string_set_length(memcached_string_st
*self
, size_t length
)
223 self
->end
= self
->string
+ length
;