/** Copyright (C) 2000 MySQL AB
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/** This file is originally from the mysql distribution. Coded by monty */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /** gcc class implementation */
#endif
#ifndef NOT_FIXED_DEC
#define NOT_FIXED_DEC 31
#endif
class String;
int sortcmp(const String *a,const String *b, CHARSET_INFO *cs);
String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);
uint32 copy_and_convert(char *to, uint32 to_length, CHARSET_INFO *to_cs,
const char *from, uint32 from_length,
CHARSET_INFO *from_cs, uint *errors);
class String
{
char *Ptr;
uint32 str_length,Alloced_length;
bool alloced;
CHARSET_INFO *str_charset;
public:
String()
{
Ptr=0; str_length=Alloced_length=0; alloced=0;
str_charset= &my_charset_bin;
}
String(uint32 length_arg)
{
alloced=0; Alloced_length=0; (void) real_alloc(length_arg);
str_charset= &my_charset_bin;
}
String(const char *str, CHARSET_INFO *cs)
{
Ptr=(char*) str; str_length=(uint) strlen(str); Alloced_length=0; alloced=0;
str_charset=cs;
}
String(const char *str,uint32 len, CHARSET_INFO *cs)
{
Ptr=(char*) str; str_length=len; Alloced_length=0; alloced=0;
str_charset=cs;
}
String(char *str,uint32 len, CHARSET_INFO *cs)
{
Ptr=(char*) str; Alloced_length=str_length=len; alloced=0;
str_charset=cs;
}
String(const String &str)
{
Ptr=str.Ptr ; str_length=str.str_length ;
Alloced_length=str.Alloced_length; alloced=0;
str_charset=str.str_charset;
}
static void *operator new(size_t size, MEM_ROOT *mem_root)
{ return (void*) alloc_root(mem_root, (uint) size); }
static void operator delete(void *ptr_arg,size_t size)
{ TRASH(ptr_arg, size); }
static void operator delete(void *ptr_arg, MEM_ROOT *mem_root)
{ /** never called */ }
~String() { free(); }
inline void set_charset(CHARSET_INFO *charset_arg)
{ str_charset= charset_arg; }
inline CHARSET_INFO *charset() const { return str_charset; }
inline uint32 length() const { return str_length;}
inline uint32 alloced_length() const { return Alloced_length;}
inline char& operator [] (uint32 i) const { return Ptr[i]; }
inline void length(uint32 len) { str_length=len ; }
inline bool is_empty() { return (str_length == 0); }
inline void mark_as_const() { Alloced_length= 0;}
inline const char *ptr() const { return Ptr; }
inline char *c_ptr()
{
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;
}
void set(String &str,uint32 offset,uint32 arg_length)
{
DBUG_ASSERT(&str != this);
free();
Ptr=(char*) str.ptr()+offset; str_length=arg_length; alloced=0;
if (str.Alloced_length)
Alloced_length=str.Alloced_length-offset;
else
Alloced_length=0;
str_charset=str.str_charset;
}
inline void set(char *str,uint32 arg_length, CHARSET_INFO *cs)
{
free();
Ptr=(char*) str; str_length=Alloced_length=arg_length ; alloced=0;
str_charset=cs;
}
inline void set(const char *str,uint32 arg_length, CHARSET_INFO *cs)
{
free();
Ptr=(char*) str; str_length=arg_length; Alloced_length=0 ; alloced=0;
str_charset=cs;
}
bool set_ascii(const char *str, uint32 arg_length);
inline void set_quick(char *str,uint32 arg_length, CHARSET_INFO *cs)
{
if (!alloced)
{
Ptr=(char*) str; str_length=Alloced_length=arg_length;
}
str_charset=cs;
}
bool set(longlong num, CHARSET_INFO *cs);
bool set(ulonglong num, CHARSET_INFO *cs);
bool set(double num,uint decimals, CHARSET_INFO *cs);
/**
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()
{
Ptr[str_length--]= '\0';
}
inline void free()
{
if (alloced)
{
alloced=0;
Alloced_length=0;
my_free(Ptr,MYF(0));
Ptr=0;
str_length=0; /** Safety */
}
}
inline bool alloc(uint32 arg_length)
{
if (arg_length < Alloced_length)
return 0;
return real_alloc(arg_length);
}
bool real_alloc(uint32 arg_length); // Empties old string
bool realloc(uint32 arg_length);
inline void shrink(uint32 arg_length) // Shrink buffer
{
if (arg_length < Alloced_length)
{
char *new_ptr;
if (!(new_ptr=(char*) my_realloc(Ptr,arg_length,MYF(0))))
{
Alloced_length = 0;
real_alloc(arg_length);
}
else
{
Ptr=new_ptr;
Alloced_length=arg_length;
}
}
}
bool is_alloced() { return alloced; }
inline String& operator = (const 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));
free();
Ptr=s.Ptr ; str_length=s.str_length ; Alloced_length=s.Alloced_length;
alloced=0;
}
return *this;
}
bool copy(); // Alloc string if not alloced
bool copy(const String &s); // Allocate new string
bool copy(const char *s,uint32 arg_length, CHARSET_INFO *cs); // Allocate new string
static bool needs_conversion(uint32 arg_length,
CHARSET_INFO *cs_from, CHARSET_INFO *cs_to,
uint32 *offset);
bool copy_aligned(const char *s, uint32 arg_length, uint32 offset,
CHARSET_INFO *cs);
bool set_or_copy_aligned(const char *s, uint32 arg_length, CHARSET_INFO *cs);
bool copy(const char*s,uint32 arg_length, CHARSET_INFO *csfrom,
CHARSET_INFO *csto, uint *errors);
bool append(const String &s);
bool append(const char *s);
bool append(const char *s,uint32 arg_length);
bool append(const char *s,uint32 arg_length, CHARSET_INFO *cs);
bool append(IO_CACHE* file, uint32 arg_length);
bool append_with_prefill(const char *s, uint32 arg_length,
uint32 full_length, char fill_char);
int strstr(const String &search,uint32 offset=0); // Returns offset to substring or -1
int strrstr(const String &search,uint32 offset=0); // Returns offset to substring or -1
bool replace(uint32 offset,uint32 arg_length,const char *to,uint32 length);
bool replace(uint32 offset,uint32 arg_length,const String &to);
inline bool
