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
);
49 /* This is the block multiplier. To keep it larger and surive division errors we must round it up */
50 adjust
= (need
- (size_t)(string
->current_size
- (size_t)(string
->end
- string
->string
))) / MEMCACHED_BLOCK_SIZE
;
53 new_size
= sizeof(char) * (size_t)((adjust
* MEMCACHED_BLOCK_SIZE
) + string
->current_size
);
54 /* Test for overflow */
56 return memcached_set_error(*string
->root
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
);
58 char *new_value
= libmemcached_xrealloc(string
->root
, string
->string
, new_size
, char);
60 if (new_value
== NULL
)
62 return memcached_set_error(*string
->root
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
);
65 string
->string
= new_value
;
66 string
->end
= string
->string
+ current_offset
;
68 string
->current_size
+= (MEMCACHED_BLOCK_SIZE
* adjust
);
71 return MEMCACHED_SUCCESS
;
74 static inline void _init_string(memcached_string_st
*self
)
76 self
->current_size
= 0;
77 self
->end
= self
->string
= NULL
;
80 memcached_string_st
*memcached_string_create(memcached_st
*memc
, memcached_string_st
*self
, size_t initial_size
)
82 WATCHPOINT_ASSERT(memc
);
84 /* Saving malloc calls :) */
87 WATCHPOINT_ASSERT(self
->options
.is_initialized
== false);
89 memcached_set_allocated(self
, false);
93 self
= libmemcached_xmalloc(memc
, memcached_string_st
);
100 memcached_set_allocated(self
, true);
106 if (memcached_failed(_string_check(self
, initial_size
)))
108 if (memcached_is_allocated(self
))
110 libmemcached_free(memc
, self
);
116 self
->options
.is_initialized
= true;
118 WATCHPOINT_ASSERT(self
->string
== self
->end
);
123 static memcached_return_t
memcached_string_append_null(memcached_string_st
*string
)
125 if (memcached_failed(_string_check(string
, 1)))
127 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
132 return MEMCACHED_SUCCESS
;
135 memcached_return_t
memcached_string_append_character(memcached_string_st
*string
,
138 if (memcached_failed(_string_check(string
, 1)))
140 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
143 *string
->end
= character
;
146 return MEMCACHED_SUCCESS
;
149 memcached_return_t
memcached_string_append(memcached_string_st
*string
,
150 const char *value
, size_t length
)
152 if (memcached_failed(_string_check(string
, length
)))
154 return MEMCACHED_MEMORY_ALLOCATION_FAILURE
;
157 WATCHPOINT_ASSERT(length
<= string
->current_size
);
158 WATCHPOINT_ASSERT(string
->string
);
159 WATCHPOINT_ASSERT(string
->end
>= string
->string
);
161 memcpy(string
->end
, value
, length
);
162 string
->end
+= length
;
164 return MEMCACHED_SUCCESS
;
167 char *memcached_string_c_copy(memcached_string_st
*string
)
169 if (not memcached_string_length(string
))
172 char *c_ptr
= static_cast<char *>(libmemcached_malloc(string
->root
, (memcached_string_length(string
)+1) * sizeof(char)));
177 memcpy(c_ptr
, memcached_string_value(string
), memcached_string_length(string
));
178 c_ptr
[memcached_string_length(string
)]= 0;
183 memcached_return_t
memcached_string_reset(memcached_string_st
*string
)
185 string
->end
= string
->string
;
187 return MEMCACHED_SUCCESS
;
190 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
)
234 assert_msg(self
, "Invalid memcached_string_st");
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
;