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5.5-merge

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This commit is contained in:
Sergei Golubchik
2011-07-02 22:08:51 +02:00
parent 0accbd0364 5a0e7394a5
commit 9809f05199
3220 changed files with 94894 additions and 422456 deletions
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45
sql/sql_string.cc
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@ -54,11 +54,33 @@ bool String::real_alloc(uint32 length)
}
/*
** Check that string is big enough. Set string[alloc_length] to 0
** (for C functions)
*/
/**
Allocates a new buffer on the heap for this String.
- If the String's internal buffer is privately owned and heap allocated,
one of the following is performed.
- If the requested length is greater than what fits in the buffer, a new
buffer is allocated, data moved and the old buffer freed.
- If the requested length is less or equal to what fits in the buffer, a
null character is inserted at the appropriate position.
- If the String does not keep a private buffer on the heap, such a buffer
will be allocated and the string copied accoring to its length, as found
in String::length().
For C compatibility, the new string buffer is null terminated.
@param alloc_length The requested string size in characters, excluding any
null terminator.
@retval false Either the copy operation is complete or, if the size of the
new buffer is smaller than the currently allocated buffer (if one exists),
no allocation occured.
@retval true An error occured when attempting to allocate memory.
*/
bool String::realloc(uint32 alloc_length)
{
if (Alloced_length <= alloc_length)
@ -131,6 +153,17 @@ bool String::copy()
return FALSE;
}
/**
Copies the internal buffer from str. If this String has a private heap
allocated buffer where new data does not fit, a new buffer is allocated
before copying and the old buffer freed. Character set information is also
copied.
@param str The string whose internal buffer is to be copied.
@retval false Success.
@retval true Memory allocation failed.
*/
bool String::copy(const String &str)
{
if (alloc(str.str_length))
@ -222,8 +255,8 @@ bool String::copy_aligned(const char *str,uint32 arg_length, uint32 offset,
CHARSET_INFO *cs)
{
/* How many bytes are in incomplete character */
offset= cs->mbmaxlen - offset; /* How many zeros we should prepend */
DBUG_ASSERT(offset && offset != cs->mbmaxlen);
offset= cs->mbminlen - offset; /* How many zeros we should prepend */
DBUG_ASSERT(offset && offset != cs->mbminlen);
uint32 aligned_length= arg_length + offset;
if (alloc(aligned_length))