mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 14:33:32 +03:00
373 lines
11 KiB
C++
373 lines
11 KiB
C++
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* This file is originally from the mysql distribution. Coded by monty */
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class implementation */
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#endif
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#ifndef NOT_FIXED_DEC
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#define NOT_FIXED_DEC 31
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#endif
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class String;
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int sortcmp(const String *a,const String *b, CHARSET_INFO *cs);
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String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);
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uint32 copy_and_convert(char *to, uint32 to_length, CHARSET_INFO *to_cs,
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const char *from, uint32 from_length,
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CHARSET_INFO *from_cs, uint *errors);
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uint32 well_formed_copy_nchars(CHARSET_INFO *to_cs,
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char *to, uint to_length,
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CHARSET_INFO *from_cs,
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const char *from, uint from_length,
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uint nchars,
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const char **well_formed_error_pos,
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const char **cannot_convert_error_pos,
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const char **from_end_pos);
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class String
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{
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char *Ptr;
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uint32 str_length,Alloced_length;
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bool alloced;
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CHARSET_INFO *str_charset;
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public:
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String()
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{
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Ptr=0; str_length=Alloced_length=0; alloced=0;
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str_charset= &my_charset_bin;
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}
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String(uint32 length_arg)
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{
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alloced=0; Alloced_length=0; (void) real_alloc(length_arg);
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str_charset= &my_charset_bin;
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}
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String(const char *str, CHARSET_INFO *cs)
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{
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Ptr=(char*) str; str_length=(uint) strlen(str); Alloced_length=0; alloced=0;
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str_charset=cs;
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}
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String(const char *str,uint32 len, CHARSET_INFO *cs)
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{
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Ptr=(char*) str; str_length=len; Alloced_length=0; alloced=0;
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str_charset=cs;
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}
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String(char *str,uint32 len, CHARSET_INFO *cs)
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{
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Ptr=(char*) str; Alloced_length=str_length=len; alloced=0;
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str_charset=cs;
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}
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String(const String &str)
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{
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Ptr=str.Ptr ; str_length=str.str_length ;
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Alloced_length=str.Alloced_length; alloced=0;
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str_charset=str.str_charset;
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}
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static void *operator new(size_t size, MEM_ROOT *mem_root)
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{ return (void*) alloc_root(mem_root, (uint) size); }
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static void operator delete(void *ptr_arg,size_t size)
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{ TRASH(ptr_arg, size); }
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static void operator delete(void *ptr_arg, MEM_ROOT *mem_root)
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{ /* never called */ }
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~String() { free(); }
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inline void set_charset(CHARSET_INFO *charset) { str_charset= charset; }
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inline CHARSET_INFO *charset() const { return str_charset; }
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inline uint32 length() const { return str_length;}
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inline uint32 alloced_length() const { return Alloced_length;}
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inline char& operator [] (uint32 i) const { return Ptr[i]; }
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inline void length(uint32 len) { str_length=len ; }
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inline bool is_empty() { return (str_length == 0); }
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inline void mark_as_const() { Alloced_length= 0;}
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inline const char *ptr() const { return Ptr; }
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inline char *c_ptr()
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{
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if (!Ptr || Ptr[str_length]) /* Should be safe */
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(void) realloc(str_length);
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return Ptr;
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}
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inline char *c_ptr_quick()
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{
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if (Ptr && str_length < Alloced_length)
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Ptr[str_length]=0;
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return Ptr;
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}
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inline char *c_ptr_safe()
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{
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if (Ptr && str_length < Alloced_length)
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Ptr[str_length]=0;
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else
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(void) realloc(str_length);
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return Ptr;
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}
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void set(String &str,uint32 offset,uint32 arg_length)
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{
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DBUG_ASSERT(&str != this);
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free();
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Ptr=(char*) str.ptr()+offset; str_length=arg_length; alloced=0;
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if (str.Alloced_length)
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Alloced_length=str.Alloced_length-offset;
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else
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Alloced_length=0;
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str_charset=str.str_charset;
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}
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inline void set(char *str,uint32 arg_length, CHARSET_INFO *cs)
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{
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free();
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Ptr=(char*) str; str_length=Alloced_length=arg_length ; alloced=0;
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str_charset=cs;
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}
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inline void set(const char *str,uint32 arg_length, CHARSET_INFO *cs)
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{
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free();
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Ptr=(char*) str; str_length=arg_length; Alloced_length=0 ; alloced=0;
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str_charset=cs;
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}
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bool set_ascii(const char *str, uint32 arg_length);
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inline void set_quick(char *str,uint32 arg_length, CHARSET_INFO *cs)
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{
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if (!alloced)
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{
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Ptr=(char*) str; str_length=Alloced_length=arg_length;
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}
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str_charset=cs;
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}
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bool set_int(longlong num, bool unsigned_flag, CHARSET_INFO *cs);
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bool set(longlong num, CHARSET_INFO *cs)
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{ return set_int(num, false, cs); }
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bool set(ulonglong num, CHARSET_INFO *cs)
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{ return set_int((longlong)num, true, cs); }
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bool set_real(double num,uint decimals, CHARSET_INFO *cs);
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/*
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PMG 2004.11.12
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This is a method that works the same as perl's "chop". It simply
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drops the last character of a string. This is useful in the case
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of the federated storage handler where I'm building a unknown
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number, list of values and fields to be used in a sql insert
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statement to be run on the remote server, and have a comma after each.
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When the list is complete, I "chop" off the trailing comma
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ex.
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String stringobj;
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stringobj.append("VALUES ('foo', 'fi', 'fo',");
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stringobj.chop();
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stringobj.append(")");
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In this case, the value of string was:
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VALUES ('foo', 'fi', 'fo',
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VALUES ('foo', 'fi', 'fo'
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VALUES ('foo', 'fi', 'fo')
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*/
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inline void chop()
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{
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Ptr[str_length--]= '\0';
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}
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inline void free()
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{
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if (alloced)
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{
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alloced=0;
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Alloced_length=0;
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my_free(Ptr,MYF(0));
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Ptr=0;
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str_length=0; /* Safety */
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}
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}
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inline bool alloc(uint32 arg_length)
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{
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if (arg_length < Alloced_length)
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return 0;
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return real_alloc(arg_length);
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}
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bool real_alloc(uint32 arg_length); // Empties old string
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bool realloc(uint32 arg_length);
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inline void shrink(uint32 arg_length) // Shrink buffer
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{
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if (arg_length < Alloced_length)
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{
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char *new_ptr;
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if (!(new_ptr=(char*) my_realloc(Ptr,arg_length,MYF(0))))
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{
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Alloced_length = 0;
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real_alloc(arg_length);
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}
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else
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{
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Ptr=new_ptr;
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Alloced_length=arg_length;
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}
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}
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}
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bool is_alloced() { return alloced; }
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inline String& operator = (const String &s)
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{
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if (&s != this)
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{
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/*
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It is forbidden to do assignments like
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some_string = substring_of_that_string
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*/
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DBUG_ASSERT(!s.uses_buffer_owned_by(this));
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free();
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Ptr=s.Ptr ; str_length=s.str_length ; Alloced_length=s.Alloced_length;
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alloced=0;
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}
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return *this;
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}
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bool copy(); // Alloc string if not alloced
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bool copy(const String &s); // Allocate new string
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bool copy(const char *s,uint32 arg_length, CHARSET_INFO *cs); // Allocate new string
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static bool needs_conversion(uint32 arg_length,
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CHARSET_INFO *cs_from, CHARSET_INFO *cs_to,
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uint32 *offset);
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bool copy_aligned(const char *s, uint32 arg_length, uint32 offset,
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CHARSET_INFO *cs);
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bool set_or_copy_aligned(const char *s, uint32 arg_length, CHARSET_INFO *cs);
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bool copy(const char*s,uint32 arg_length, CHARSET_INFO *csfrom,
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CHARSET_INFO *csto, uint *errors);
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bool append(const String &s);
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bool append(const char *s);
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bool append(const char *s,uint32 arg_length);
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bool append(const char *s,uint32 arg_length, CHARSET_INFO *cs);
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bool append(IO_CACHE* file, uint32 arg_length);
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bool append_with_prefill(const char *s, uint32 arg_length,
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uint32 full_length, char fill_char);
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int strstr(const String &search,uint32 offset=0); // Returns offset to substring or -1
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int strrstr(const String &search,uint32 offset=0); // Returns offset to substring or -1
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bool replace(uint32 offset,uint32 arg_length,const char *to,uint32 length);
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bool replace(uint32 offset,uint32 arg_length,const String &to);
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inline bool append(char chr)
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{
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if (str_length < Alloced_length)
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{
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Ptr[str_length++]=chr;
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}
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else
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{
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if (realloc(str_length+1))
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return 1;
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Ptr[str_length++]=chr;
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}
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return 0;
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}
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bool fill(uint32 max_length,char fill);
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void strip_sp();
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friend int sortcmp(const String *a,const String *b, CHARSET_INFO *cs);
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friend int stringcmp(const String *a,const String *b);
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friend String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);
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uint32 numchars();
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int charpos(int i,uint32 offset=0);
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int reserve(uint32 space_needed)
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{
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return realloc(str_length + space_needed);
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}
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int reserve(uint32 space_needed, uint32 grow_by);
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/*
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The following append operations do NOT check alloced memory
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q_*** methods writes values of parameters itself
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qs_*** methods writes string representation of value
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*/
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void q_append(const char c)
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{
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Ptr[str_length++] = c;
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}
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void q_append(const uint32 n)
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{
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int4store(Ptr + str_length, n);
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str_length += 4;
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}
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void q_append(double d)
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{
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float8store(Ptr + str_length, d);
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str_length += 8;
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}
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void q_append(double *d)
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{
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float8store(Ptr + str_length, *d);
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str_length += 8;
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}
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void q_append(const char *data, uint32 data_len)
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{
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memcpy(Ptr + str_length, data, data_len);
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str_length += data_len;
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}
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void write_at_position(int position, uint32 value)
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{
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int4store(Ptr + position,value);
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}
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void qs_append(const char *str, uint32 len);
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void qs_append(double d);
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void qs_append(double *d);
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inline void qs_append(const char c)
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{
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Ptr[str_length]= c;
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str_length++;
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}
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void qs_append(int i);
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void qs_append(uint i);
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/* Inline (general) functions used by the protocol functions */
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inline char *prep_append(uint32 arg_length, uint32 step_alloc)
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{
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uint32 new_length= arg_length + str_length;
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if (new_length > Alloced_length)
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{
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if (realloc(new_length + step_alloc))
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return 0;
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}
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uint32 old_length= str_length;
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str_length+= arg_length;
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return Ptr+ old_length; /* Area to use */
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}
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inline bool append(const char *s, uint32 arg_length, uint32 step_alloc)
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{
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uint32 new_length= arg_length + str_length;
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if (new_length > Alloced_length && realloc(new_length + step_alloc))
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return TRUE;
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memcpy(Ptr+str_length, s, arg_length);
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str_length+= arg_length;
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return FALSE;
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}
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void print(String *print);
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/* Swap two string objects. Efficient way to exchange data without memcpy. */
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void swap(String &s);
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inline bool uses_buffer_owned_by(const String *s) const
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{
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return (s->alloced && Ptr >= s->Ptr && Ptr < s->Ptr + s->str_length);
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}
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};
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static inline bool check_if_only_end_space(CHARSET_INFO *cs, char *str,
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char *end)
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{
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return str+ cs->cset->scan(cs, str, end, MY_SEQ_SPACES) == end;
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}
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