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mariadb/sql/sql_string.h
Alexander Barkov 1517087b54 MDEV-20042 Implement EXTRA2_FIELD_DATA_TYPE_INFO in FRM
2019-07-11 21:51:18 +04:00

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#ifndef SQL_STRING_INCLUDED
#define SQL_STRING_INCLUDED
/*
Copyright (c) 2000, 2013, Oracle and/or its affiliates.
Copyright (c) 2008, 2018, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/* This file is originally from the mysql distribution. Coded by monty */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
#include "m_ctype.h" /* my_charset_bin */
#include <my_sys.h> /* alloc_root, my_free, my_realloc */
#include "m_string.h" /* TRASH */
#include "sql_list.h"
class String;
typedef struct st_io_cache IO_CACHE;
typedef struct st_mem_root MEM_ROOT;
#include "pack.h"
int sortcmp(const String *a,const String *b, CHARSET_INFO *cs);
String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);
inline uint32 copy_and_convert(char *to, size_t to_length,
CHARSET_INFO *to_cs,
const char *from, size_t from_length,
CHARSET_INFO *from_cs, uint *errors)
{
return my_convert(to, (uint)to_length, to_cs, from, (uint)from_length, from_cs, errors);
}
class String_copy_status: protected MY_STRCOPY_STATUS
{
public:
const char *source_end_pos() const
{ return m_source_end_pos; }
const char *well_formed_error_pos() const
{ return m_well_formed_error_pos; }
};
class Well_formed_prefix_status: public String_copy_status
{
public:
Well_formed_prefix_status(CHARSET_INFO *cs,
const char *str, const char *end, size_t nchars)
{ cs->cset->well_formed_char_length(cs, str, end, nchars, this); }
};
class Well_formed_prefix: public Well_formed_prefix_status
{
const char *m_str; // The beginning of the string
public:
Well_formed_prefix(CHARSET_INFO *cs, const char *str, const char *end,
size_t nchars)
:Well_formed_prefix_status(cs, str, end, nchars), m_str(str)
{ }
Well_formed_prefix(CHARSET_INFO *cs, const char *str, size_t length,
size_t nchars)
:Well_formed_prefix_status(cs, str, str + length, nchars), m_str(str)
{ }
Well_formed_prefix(CHARSET_INFO *cs, const char *str, size_t length)
:Well_formed_prefix_status(cs, str, str + length, length), m_str(str)
{ }
size_t length() const { return m_source_end_pos - m_str; }
};
class String_copier: public String_copy_status,
protected MY_STRCONV_STATUS
{
public:
const char *cannot_convert_error_pos() const
{ return m_cannot_convert_error_pos; }
const char *most_important_error_pos() const
{
return well_formed_error_pos() ? well_formed_error_pos() :
cannot_convert_error_pos();
}
/*
Convert a string between character sets.
"dstcs" and "srccs" cannot be &my_charset_bin.
*/
size_t convert_fix(CHARSET_INFO *dstcs, char *dst, size_t dst_length,
CHARSET_INFO *srccs, const char *src, size_t src_length, size_t nchars)
{
return my_convert_fix(dstcs, dst, dst_length,
srccs, src, src_length, nchars, this, this);
}
/*
Copy a string. Fix bad bytes/characters to '?'.
*/
uint well_formed_copy(CHARSET_INFO *to_cs, char *to, size_t to_length,
CHARSET_INFO *from_cs, const char *from, size_t from_length, size_t nchars);
// Same as above, but without the "nchars" limit.
uint well_formed_copy(CHARSET_INFO *to_cs, char *to, size_t to_length,
CHARSET_INFO *from_cs, const char *from, size_t from_length)
{
return well_formed_copy(to_cs, to, to_length,
from_cs, from, from_length,
from_length /* No limit on "nchars"*/);
}
};
size_t my_copy_with_hex_escaping(CHARSET_INFO *cs,
char *dst, size_t dstlen,
const char *src, size_t srclen);
uint convert_to_printable(char *to, size_t to_len,
const char *from, size_t from_len,
CHARSET_INFO *from_cs, size_t nbytes= 0);
size_t convert_to_printable_required_length(uint len);
class Charset
{
CHARSET_INFO *m_charset;
public:
Charset() :m_charset(&my_charset_bin) { }
Charset(CHARSET_INFO *cs) :m_charset(cs) { }
CHARSET_INFO *charset() const { return m_charset; }
uint mbminlen() const { return m_charset->mbminlen; }
uint mbmaxlen() const { return m_charset->mbmaxlen; }
bool is_good_for_ft() const
{
// Binary and UCS2/UTF16/UTF32 are not supported
return m_charset != &my_charset_bin && m_charset->mbminlen == 1;
}
size_t numchars(const char *str, const char *end) const
{
return m_charset->cset->numchars(m_charset, str, end);
}
size_t charpos(const char *str, const char *end, size_t pos) const
{
return m_charset->cset->charpos(m_charset, str, end, pos);
}
void set_charset(CHARSET_INFO *charset_arg)
{
m_charset= charset_arg;
}
void set_charset(const Charset &other)
{
m_charset= other.m_charset;
}
void swap(Charset &other)
{
swap_variables(CHARSET_INFO*, m_charset, other.m_charset);
}
/*
Collation name without the character set name.
For example, in case of "latin1_swedish_ci",
this method returns "_swedish_ci".
*/
LEX_CSTRING collation_specific_name() const;
bool encoding_allows_reinterpret_as(CHARSET_INFO *cs) const;
bool eq_collation_specific_names(CHARSET_INFO *cs) const;
};
/*
A storage for String.
Should be eventually derived from LEX_STRING.
*/
class Static_binary_string : public Sql_alloc
{
protected:
char *Ptr;
uint32 str_length;
public:
Static_binary_string()
:Ptr(NULL),
str_length(0)
{ }
Static_binary_string(char *str, size_t length_arg)
:Ptr(str),
str_length((uint32) length_arg)
{
DBUG_ASSERT(length_arg < UINT_MAX32);
}
inline uint32 length() const { return str_length;}
inline char& operator [] (size_t i) const { return Ptr[i]; }
inline void length(size_t len) { str_length=(uint32)len ; }
inline bool is_empty() const { return (str_length == 0); }
inline const char *ptr() const { return Ptr; }
inline const char *end() const { return Ptr + str_length; }
LEX_STRING lex_string() const
{
LEX_STRING str = { (char*) ptr(), length() };
return str;
}
LEX_CSTRING lex_cstring() const
{
LEX_CSTRING skr = { ptr(), length() };
return skr;
}
bool has_8bit_bytes() const
{
for (const char *c= ptr(), *c_end= end(); c < c_end; c++)
{
if (!my_isascii(*c))
return true;
}
return false;
}
bool bin_eq(const Static_binary_string *other) const
{
return length() == other->length() &&
!memcmp(ptr(), other->ptr(), length());
}
void set(char *str, size_t len)
{
Ptr= str;
str_length= (uint32) len;
}
void swap(Static_binary_string &s)
{
swap_variables(char *, Ptr, s.Ptr);
swap_variables(uint32, str_length, s.str_length);
}
/*
PMG 2004.11.12
This is a method that works the same as perl's "chop". It simply
drops the last character of a string. This is useful in the case
of the federated storage handler where I'm building a unknown
number, list of values and fields to be used in a sql insert
statement to be run on the remote server, and have a comma after each.
When the list is complete, I "chop" off the trailing comma
ex.
String stringobj;
stringobj.append("VALUES ('foo', 'fi', 'fo',");
stringobj.chop();
stringobj.append(")");
In this case, the value of string was:
VALUES ('foo', 'fi', 'fo',
VALUES ('foo', 'fi', 'fo'
VALUES ('foo', 'fi', 'fo')
*/
inline void chop()
{
str_length--;
Ptr[str_length]= '\0';
DBUG_ASSERT(strlen(Ptr) == str_length);
}
// Returns offset to substring or -1
int strstr(const Static_binary_string &search, uint32 offset=0);
// Returns offset to substring or -1
int strrstr(const Static_binary_string &search, uint32 offset=0);
/*
The following append operations do NOT check alloced memory
q_*** methods writes values of parameters itself
qs_*** methods writes string representation of value
*/
void q_append(const char c)
{
Ptr[str_length++] = c;
}
void q_append2b(const uint32 n)
{
int2store(Ptr + str_length, n);
str_length += 2;
}
void q_append(const uint32 n)
{
int4store(Ptr + str_length, n);
str_length += 4;
}
void q_append(double d)
{
float8store(Ptr + str_length, d);
str_length += 8;
}
void q_append(double *d)
{
float8store(Ptr + str_length, *d);
str_length += 8;
}
void q_append(const char *data, size_t data_len)
{
memcpy(Ptr + str_length, data, data_len);
DBUG_ASSERT(str_length <= UINT_MAX32 - data_len);
str_length += (uint)data_len;
}
void q_append(const LEX_CSTRING *ls)
{
DBUG_ASSERT(ls->length < UINT_MAX32 &&
((ls->length == 0 && !ls->str) ||
ls->length == strlen(ls->str)));
q_append(ls->str, (uint32) ls->length);
}
void write_at_position(int position, uint32 value)
{
int4store(Ptr + position,value);
}
void qs_append(const char *str)
{
qs_append(str, (uint32)strlen(str));
}
void qs_append(const LEX_CSTRING *ls)
{
DBUG_ASSERT(ls->length < UINT_MAX32 &&
((ls->length == 0 && !ls->str) ||
ls->length == strlen(ls->str)));
qs_append(ls->str, (uint32)ls->length);
}
void qs_append(const char *str, size_t len);
void qs_append_hex(const char *str, uint32 len);
void qs_append(double d);
void qs_append(double *d);
inline void qs_append(const char c)
{
Ptr[str_length]= c;
str_length++;
}
void qs_append(int i);
void qs_append(uint i)
{
qs_append((ulonglong)i);
}
void qs_append(ulong i)
{
qs_append((ulonglong)i);
}
void qs_append(ulonglong i);
void qs_append(longlong i, int radix)
{
char *buff= Ptr + str_length;
char *end= ll2str(i, buff, radix, 0);
str_length+= uint32(end-buff);
}
};
class Binary_string: public Static_binary_string
{
uint32 Alloced_length, extra_alloc;
bool alloced, thread_specific;
void init_private_data()
{
Alloced_length= extra_alloc= 0;
alloced= thread_specific= false;
}
public:
Binary_string()
{
init_private_data();
}
explicit Binary_string(size_t length_arg)
{
init_private_data();
(void) real_alloc(length_arg);
}
explicit Binary_string(const char *str)
:Binary_string(str, strlen(str))
{ }
/*
NOTE: If one intend to use the c_ptr() method, the following two
contructors need the size of memory for STR to be at least LEN+1 (to make
room for zero termination).
*/
Binary_string(const char *str, size_t len)
:Static_binary_string((char *) str, len)
{
init_private_data();
}
Binary_string(char *str, size_t len)
:Static_binary_string(str, len)
{
Alloced_length= (uint32) len;
extra_alloc= 0;
alloced= thread_specific= 0;
}
explicit Binary_string(const Binary_string &str)
:Static_binary_string(str)
{
Alloced_length= str.Alloced_length;
extra_alloc= 0;
alloced= thread_specific= 0;
}
~Binary_string() { free(); }
/* Mark variable thread specific it it's not allocated already */
inline void set_thread_specific()
{
if (!alloced)
thread_specific= 1;
}
bool is_alloced() const { return alloced; }
inline uint32 alloced_length() const { return Alloced_length;}
inline uint32 extra_allocation() const { return extra_alloc;}
inline void extra_allocation(size_t len) { extra_alloc= (uint32)len; }
inline void mark_as_const() { Alloced_length= 0;}
inline bool uses_buffer_owned_by(const Binary_string *s) const
{
return (s->alloced && Ptr >= s->Ptr && Ptr < s->Ptr + s->str_length);
}
/* Swap two string objects. Efficient way to exchange data without memcpy. */
void swap(Binary_string &s)
{
Static_binary_string::swap(s);
swap_variables(uint32, Alloced_length, s.Alloced_length);
swap_variables(bool, alloced, s.alloced);
}
/**
Points the internal buffer to the supplied one. The old buffer is freed.
@param str Pointer to the new buffer.
@param arg_length Length of the new buffer in characters, excluding any
null character.
@note The new buffer will not be null terminated.
*/
void set_alloced(char *str, size_t length_arg, size_t alloced_length_arg)
{
free();
Static_binary_string::set(str, length_arg);
DBUG_ASSERT(alloced_length_arg < UINT_MAX32);
Alloced_length= (uint32) alloced_length_arg;
}
inline void set(char *str, size_t arg_length)
{
set_alloced(str, arg_length, arg_length);
}
inline void set(const char *str, size_t arg_length)
{
free();
Static_binary_string::set((char *) str, arg_length);
}
void set(Binary_string &str, size_t offset, size_t arg_length)
{
DBUG_ASSERT(&str != this);
free();
Static_binary_string::set((char*) str.ptr() + offset, arg_length);
if (str.Alloced_length)
Alloced_length= (uint32) (str.Alloced_length - offset);
}
/* Take over handling of buffer from some other object */
void reset(char *ptr_arg, size_t length_arg, size_t alloced_length_arg)
{
set_alloced(ptr_arg, length_arg, alloced_length_arg);
alloced= ptr_arg != 0;
}
/* Forget about the buffer, let some other object handle it */
char *release()
{
char *old= Ptr;
Static_binary_string::set(NULL, 0);
init_private_data();
return old;
}
inline void set_quick(char *str, size_t arg_length)
{
if (!alloced)
{
Static_binary_string::set(str, arg_length);
Alloced_length= (uint32) arg_length;
}
}
inline Binary_string& operator=(const Binary_string &s)
{
if (&s != this)
{
/*
It is forbidden to do assignments like
some_string = substring_of_that_string
*/
DBUG_ASSERT(!s.uses_buffer_owned_by(this));
set_alloced((char *) s.Ptr, s.str_length, s.Alloced_length);
}
return *this;
}
bool set_hex(ulonglong num);
bool set_hex(const char *str, uint32 len);
bool copy(); // Alloc string if not alloced
bool copy(const Binary_string &s); // Allocate new string
bool copy(const char *s, size_t arg_length); // Allocate new string
bool copy_or_move(const char *s,size_t arg_length);
bool append_ulonglong(ulonglong val);
bool append_longlong(longlong val);
bool append(const char *s, size_t size)
{
if (!size)
return false;
if (realloc_with_extra_if_needed(str_length + size))
return true;
q_append(s, size);
return false;
}
bool append(const LEX_CSTRING &s)
{
return append(s.str, s.length);
}
bool append(const Binary_string &s)
{
return append(s.ptr(), s.length());
}
bool append(IO_CACHE* file, uint32 arg_length);
inline bool append_char(char chr)
{
if (str_length < Alloced_length)
{
Ptr[str_length++]= chr;
}
else
{
if (unlikely(realloc_with_extra(str_length + 1)))
return true;
Ptr[str_length++]= chr;
}
return false;
}
bool append_hex(const char *src, uint32 srclen)
{
for (const char *src_end= src + srclen ; src != src_end ; src++)
{
if (unlikely(append_char(_dig_vec_lower[((uchar) *src) >> 4])) ||
unlikely(append_char(_dig_vec_lower[((uchar) *src) & 0x0F])))
return true;
}
return false;
}
bool append_with_step(const char *s, uint32 arg_length, uint32 step_alloc)
{
uint32 new_length= arg_length + str_length;
if (new_length > Alloced_length &&
unlikely(realloc(new_length + step_alloc)))
return true;
q_append(s, arg_length);
return false;
}
inline char *c_ptr()
{
DBUG_ASSERT(!alloced || !Ptr || !Alloced_length ||
(Alloced_length >= (str_length + 1)));
if (!Ptr || Ptr[str_length]) // Should be safe
(void) realloc(str_length);
return Ptr;
}
inline char *c_ptr_quick()
{
if (Ptr && str_length < Alloced_length)
Ptr[str_length]=0;
return Ptr;
}
inline char *c_ptr_safe()
{
if (Ptr && str_length < Alloced_length)
Ptr[str_length]=0;
else
(void) realloc(str_length);
return Ptr;
}
inline void free()
{
if (alloced)
{
alloced=0;
my_free(Ptr);
}
Alloced_length= extra_alloc= 0;
Static_binary_string::set(NULL, 0); // Safety
}
inline bool alloc(size_t arg_length)
{
if (arg_length < Alloced_length)
return 0;
return real_alloc(arg_length);
}
bool real_alloc(size_t arg_length); // Empties old string
bool realloc_raw(size_t arg_length);
bool realloc(size_t arg_length)
{
if (realloc_raw(arg_length))
return TRUE;
Ptr[arg_length]= 0; // This make other funcs shorter
return FALSE;
}
bool realloc_with_extra(size_t arg_length)
{
if (extra_alloc < 4096)
extra_alloc= extra_alloc*2+128;
if (realloc_raw(arg_length + extra_alloc))
return TRUE;
Ptr[arg_length]=0; // This make other funcs shorter
return FALSE;
}
bool realloc_with_extra_if_needed(size_t arg_length)
{
if (arg_length < Alloced_length)
{
Ptr[arg_length]=0; // behave as if realloc was called.
return 0;
}
return realloc_with_extra(arg_length);
}
// Shrink the buffer, but only if it is allocated on the heap.
inline void shrink(size_t arg_length)
{
if (!is_alloced())
return;
if (ALIGN_SIZE(arg_length+1) < Alloced_length)
{
char *new_ptr;
if (unlikely(!(new_ptr=(char*)
my_realloc(Ptr,
arg_length,MYF((thread_specific ?
MY_THREAD_SPECIFIC : 0))))))
{
Alloced_length= 0;
real_alloc(arg_length);
}
else
{
Ptr= new_ptr;
Alloced_length= (uint32) arg_length;
}
}
}
void move(Binary_string &s)
{
set_alloced(s.Ptr, s.str_length, s.Alloced_length);
extra_alloc= s.extra_alloc;
alloced= s.alloced;
thread_specific= s.thread_specific;
s.alloced= 0;
}
bool fill(uint32 max_length,char fill);
/*
Replace substring with string
If wrong parameter or not enough memory, do nothing
*/
bool replace(uint32 offset,uint32 arg_length, const char *to, uint32 length);
bool replace(uint32 offset,uint32 arg_length, const Static_binary_string &to)
{
return replace(offset,arg_length,to.ptr(),to.length());
}
int reserve(size_t space_needed)
{
DBUG_ASSERT((ulonglong) str_length + space_needed < UINT_MAX32);
return realloc(str_length + space_needed);
}
int reserve(size_t space_needed, size_t grow_by);
inline char *prep_append(uint32 arg_length, uint32 step_alloc)
{
uint32 new_length= arg_length + str_length;
if (new_length > Alloced_length)
{
if (unlikely(realloc(new_length + step_alloc)))
return 0;
}
uint32 old_length= str_length;
str_length+= arg_length;
return Ptr + old_length; // Area to use
}
void q_net_store_length(ulonglong length)
{
DBUG_ASSERT(Alloced_length >= (str_length + net_length_size(length)));
char *pos= (char *) net_store_length((uchar *)(Ptr + str_length), length);
str_length= uint32(pos - Ptr);
}
void q_net_store_data(const uchar *from, size_t length)
{
DBUG_ASSERT(length < UINT_MAX32);
DBUG_ASSERT(Alloced_length >= (str_length + length +
net_length_size(length)));
q_net_store_length(length);
q_append((const char *)from, (uint32) length);
}
};
class String: public Charset, public Binary_string
{
public:
String() { }
String(size_t length_arg)
:Binary_string(length_arg)
{ }
String(const char *str, CHARSET_INFO *cs)
:Charset(cs),
Binary_string(str)
{ }
/*
NOTE: If one intend to use the c_ptr() method, the following two
contructors need the size of memory for STR to be at least LEN+1 (to make
room for zero termination).
*/
String(const char *str, size_t len, CHARSET_INFO *cs)
:Charset(cs),
Binary_string((char *) str, len)
{ }
String(char *str, size_t len, CHARSET_INFO *cs)
:Charset(cs),
Binary_string(str, len)
{ }
String(const String &str)
:Charset(str),
Binary_string(str)
{ }
void set(String &str,size_t offset,size_t arg_length)
{
Binary_string::set(str, offset, arg_length);
set_charset(str);
}
inline void set(char *str,size_t arg_length, CHARSET_INFO *cs)
{
Binary_string::set(str, arg_length);
set_charset(cs);
}
inline void set(const char *str,size_t arg_length, CHARSET_INFO *cs)
{
Binary_string::set(str, arg_length);
set_charset(cs);
}
bool set_ascii(const char *str, size_t arg_length);
inline void set_quick(char *str,size_t arg_length, CHARSET_INFO *cs)
{
Binary_string::set_quick(str, arg_length);
set_charset(cs);
}
bool set_int(longlong num, bool unsigned_flag, CHARSET_INFO *cs);
bool set(int num, CHARSET_INFO *cs) { return set_int(num, false, cs); }
bool set(uint num, CHARSET_INFO *cs) { return set_int(num, true, cs); }
bool set(long num, CHARSET_INFO *cs) { return set_int(num, false, cs); }
bool set(ulong num, CHARSET_INFO *cs) { return set_int(num, true, cs); }
bool set(longlong num, CHARSET_INFO *cs) { return set_int(num, false, cs); }
bool set(ulonglong num, CHARSET_INFO *cs) { return set_int((longlong)num, true, cs); }
bool set_real(double num,uint decimals, CHARSET_INFO *cs);
bool set_hex(ulonglong num)
{
set_charset(&my_charset_latin1);
return Binary_string::set_hex(num);
}
bool set_hex(const char *str, uint32 len)
{
set_charset(&my_charset_latin1);
return Binary_string::set_hex(str, len);
}
/* Take over handling of buffer from some other object */
void reset(char *ptr_arg, size_t length_arg, size_t alloced_length_arg,
CHARSET_INFO *cs)
{
Binary_string::reset(ptr_arg, length_arg, alloced_length_arg);
set_charset(cs);
}
inline String& operator = (const String &s)
{
if (&s != this)
{
set_charset(s);
Binary_string::operator=(s);
}
return *this;
}
bool copy()
{
return Binary_string::copy();
}
bool copy(const String &s)
{
set_charset(s);
return Binary_string::copy(s);
}
bool copy(const char *s, size_t arg_length, CHARSET_INFO *cs)
{
set_charset(cs);
return Binary_string::copy(s, arg_length);
}
bool copy_or_move(const char *s, size_t arg_length, CHARSET_INFO *cs)
{
set_charset(cs);
return Binary_string::copy_or_move(s, arg_length);
}
static bool needs_conversion(size_t arg_length,
CHARSET_INFO *cs_from, CHARSET_INFO *cs_to,
uint32 *offset);
static bool needs_conversion_on_storage(size_t arg_length,
CHARSET_INFO *cs_from,
CHARSET_INFO *cs_to);
bool copy_aligned(const char *s, size_t arg_length, size_t offset,
CHARSET_INFO *cs);
bool set_or_copy_aligned(const char *s, size_t arg_length, CHARSET_INFO *cs);
bool copy(const char*s, size_t arg_length, CHARSET_INFO *csfrom,
CHARSET_INFO *csto, uint *errors);
bool copy(const String *str, CHARSET_INFO *tocs, uint *errors)
{
return copy(str->ptr(), str->length(), str->charset(), tocs, errors);
}
bool copy(CHARSET_INFO *tocs,
CHARSET_INFO *fromcs, const char *src, size_t src_length,
size_t nchars, String_copier *copier)
{
if (unlikely(alloc(tocs->mbmaxlen * src_length)))
return true;
str_length= copier->well_formed_copy(tocs, Ptr, alloced_length(),
fromcs, src, (uint)src_length, (uint)nchars);
set_charset(tocs);
return false;
}
// Append without character set conversion
bool append(const String &s)
{
return Binary_string::append(s);
}
inline bool append(char chr)
{
return Binary_string::append_char(chr);
}
bool append_hex(const char *src, uint32 srclen)
{
return Binary_string::append_hex(src, srclen);
}
bool append_hex(const uchar *src, uint32 srclen)
{
return Binary_string::append_hex((const char*)src, srclen);
}
bool append(IO_CACHE* file, uint32 arg_length)
{
return Binary_string::append(file, arg_length);
}
inline bool append(const char *s, uint32 arg_length, uint32 step_alloc)
{
return append_with_step(s, arg_length, step_alloc);
}
// Append with optional character set conversion from ASCII (e.g. to UCS2)
bool append(const char *s)
{
return append(s, strlen(s));
}
bool append(const LEX_STRING *ls)
{
DBUG_ASSERT(ls->length < UINT_MAX32 &&
((ls->length == 0 && !ls->str) ||
ls->length == strlen(ls->str)));
return append(ls->str, (uint32) ls->length);
}
bool append(const LEX_CSTRING *ls)
{
DBUG_ASSERT(ls->length < UINT_MAX32 &&
((ls->length == 0 && !ls->str) ||
ls->length == strlen(ls->str)));
return append(ls->str, (uint32) ls->length);
}
bool append(const LEX_CSTRING &ls)
{
return append(&ls);
}
bool append(const char *s, size_t size);
bool append_with_prefill(const char *s, uint32 arg_length,
uint32 full_length, char fill_char);
bool append_parenthesized(long nr, int radix= 10);
// Append with optional character set conversion from cs to charset()
bool append(const char *s, size_t arg_length, CHARSET_INFO *cs);
bool append(const LEX_CSTRING &s, CHARSET_INFO *cs)
{
return append(s.str, s.length, cs);
}
void strip_sp();
friend int sortcmp(const String *a,const String *b, CHARSET_INFO *cs);
friend int stringcmp(const String *a,const String *b);
friend String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);
friend class Field;
uint32 numchars() const
{
return (uint32) Charset::numchars(ptr(), end());
}
int charpos(longlong i, uint32 offset=0)
{
if (i <= 0)
return (int) i;
return (int) Charset::charpos(ptr() + offset, end(), (size_t) i);
}
void print(String *to) const;
void print_with_conversion(String *to, CHARSET_INFO *cs) const;
void print(String *to, CHARSET_INFO *cs) const
{
if (my_charset_same(charset(), cs))
print(to);
else
print_with_conversion(to, cs);
}
bool append_for_single_quote(const char *st, size_t len);
bool append_for_single_quote(const String *s)
{
return append_for_single_quote(s->ptr(), s->length());
}
bool append_for_single_quote(const char *st)
{
size_t len= strlen(st);
DBUG_ASSERT(len < UINT_MAX32);
return append_for_single_quote(st, (uint32) len);
}
void swap(String &s)
{
Charset::swap(s);
Binary_string::swap(s);
}
uint well_formed_length() const
{
return (uint) Well_formed_prefix(charset(), ptr(), length()).length();
}
bool is_ascii() const
{
if (length() == 0)
return TRUE;
if (charset()->mbminlen > 1)
return FALSE;
return !has_8bit_bytes();
}
bool eq(const String *other, CHARSET_INFO *cs) const
{
return !sortcmp(this, other, cs);
}
private:
bool append_semi_hex(const char *s, uint len, CHARSET_INFO *cs);
};
// The following class is a backport from MySQL 5.6:
/**
String class wrapper with a preallocated buffer of size buff_sz
This class allows to replace sequences of:
char buff[12345];
String str(buff, sizeof(buff));
str.length(0);
with a simple equivalent declaration:
StringBuffer<12345> str;
*/
template<size_t buff_sz>
class StringBuffer : public String
{
char buff[buff_sz];
public:
StringBuffer() : String(buff, buff_sz, &my_charset_bin) { length(0); }
explicit StringBuffer(CHARSET_INFO *cs) : String(buff, buff_sz, cs)
{
length(0);
}
};
template<size_t buff_sz>
class BinaryStringBuffer : public Binary_string
{
char buff[buff_sz];
public:
BinaryStringBuffer() : Binary_string(buff, buff_sz) { length(0); }
};
class String_space: public String
{
public:
String_space(uint n)
{
if (fill(n, ' '))
set("", 0, &my_charset_bin);
}
};
static inline bool check_if_only_end_space(CHARSET_INFO *cs,
const char *str,
const char *end)
{
return str+ cs->cset->scan(cs, str, end, MY_SEQ_SPACES) == end;
}
int append_query_string(CHARSET_INFO *csinfo, String *to,
const char *str, size_t len, bool no_backslash);
#endif /* SQL_STRING_INCLUDED */
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