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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems
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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; version 2 of the License.
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef DRIZZLED_SQL_STRING_H
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#define DRIZZLED_SQL_STRING_H
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/* This file is originally from the mysql distribution. Coded by monty */
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#include <drizzled/common.h>
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#define NOT_FIXED_DEC (uint8_t)31
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extern String my_empty_string;
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extern const String my_null_string;
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namespace memory { class Root; }
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typedef struct charset_info_st CHARSET_INFO;
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std::string String_to_std_string(String const& s);
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String* set_String_from_std_string(String* s, std::string const& cs);
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int sortcmp(const String *a,const String *b, const CHARSET_INFO * const cs);
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int stringcmp(const String *a,const String *b);
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String *copy_if_not_alloced(String *a,String *b,uint32_t arg_length);
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uint32_t well_formed_copy_nchars(const CHARSET_INFO * const to_cs,
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char *to, uint32_t to_length,
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const CHARSET_INFO * const from_cs,
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const char *from, uint32_t from_length,
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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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uint32_t str_length,Alloced_length;
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const CHARSET_INFO *str_charset;
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String(uint32_t length_arg);
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String(const char *str, const CHARSET_INFO * const cs);
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String(const char *str, uint32_t len, const CHARSET_INFO * const cs);
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String(char *str, uint32_t len, const CHARSET_INFO * const cs);
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String(const String &str);
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static void *operator new(size_t size, memory::Root *mem_root);
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static void operator delete(void *, size_t)
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static void operator delete(void *, memory::Root *)
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inline void set_charset(const CHARSET_INFO * const charset_arg)
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{ str_charset= charset_arg; }
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inline const CHARSET_INFO *charset() const { return str_charset; }
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inline uint32_t length() const { return str_length;}
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inline uint32_t alloced_length() const { return Alloced_length;}
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inline char& operator [] (uint32_t i) const { return Ptr[i]; }
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inline void length(uint32_t 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 char *ptr() { return Ptr; }
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inline const char *ptr() const { return Ptr; }
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if (str_length == Alloced_length)
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(void) realloc(str_length);
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inline char *c_ptr_quick()
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if (Ptr && str_length < Alloced_length)
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inline char *c_ptr_safe()
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if (Ptr && str_length < Alloced_length)
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(void) realloc(str_length);
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if (Ptr && str_length < Alloced_length)
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(void) realloc(str_length);
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void append_identifier(const char *name, uint32_t length);
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void set(String &str,uint32_t offset,uint32_t arg_length)
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assert(&str != this);
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Ptr= 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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str_charset=str.str_charset;
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inline void set(char *str,uint32_t arg_length, const CHARSET_INFO * const cs)
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Ptr= str; str_length=Alloced_length=arg_length ; alloced=0;
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inline void set(const char *str,uint32_t arg_length, const CHARSET_INFO * const cs)
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Ptr= const_cast<char*>(str);
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str_length=arg_length; Alloced_length=0 ; alloced=0;
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bool set_ascii(const char *str, uint32_t arg_length);
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inline void set_quick(char *str,uint32_t arg_length, const CHARSET_INFO * const cs)
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Ptr= str; str_length= Alloced_length= arg_length;
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bool set_int(int64_t num, bool unsigned_flag, const CHARSET_INFO * const cs);
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bool set(int64_t num, const CHARSET_INFO * const cs)
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{ return set_int(num, false, cs); }
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bool set(uint64_t num, const CHARSET_INFO * const cs)
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{ return set_int(static_cast<int64_t>(num), true, cs); }
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bool set_real(double num,uint32_t decimals, const CHARSET_INFO * const cs);
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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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stringobj.append("VALUES ('foo', 'fi', 'fo',");
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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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Ptr[str_length--]= '\0';
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str_length=0; /* Safety */
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inline bool alloc(uint32_t arg_length)
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if (arg_length < Alloced_length)
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return real_alloc(arg_length);
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bool real_alloc(uint32_t arg_length); // Empties old string
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bool realloc(uint32_t arg_length);
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inline void shrink(uint32_t arg_length) // Shrink buffer
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if (arg_length < Alloced_length)
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if (!(new_ptr= reinterpret_cast<char*>(::realloc(Ptr,arg_length))))
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real_alloc(arg_length);
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Alloced_length=arg_length;
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bool is_alloced() { return alloced; }
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inline String& operator = (const String &s)
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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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assert(!s.uses_buffer_owned_by(this));
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Ptr=s.Ptr ; str_length=s.str_length ; Alloced_length=s.Alloced_length;
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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_t arg_length, const CHARSET_INFO * const cs); // Allocate new string
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static bool needs_conversion(uint32_t arg_length,
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const CHARSET_INFO * const cs_from, const CHARSET_INFO * const cs_to,
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bool set_or_copy_aligned(const char *s, uint32_t arg_length, const CHARSET_INFO * const cs);
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bool copy(const char*s,uint32_t arg_length, const CHARSET_INFO * const csfrom,
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const CHARSET_INFO * const csto, uint32_t *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_t arg_length);
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bool append(const char *s,uint32_t arg_length, const CHARSET_INFO * const cs);
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bool append_with_prefill(const char *s, uint32_t arg_length,
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uint32_t full_length, char fill_char);
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int strstr(const String &search,uint32_t offset=0); // Returns offset to substring or -1
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int strrstr(const String &search,uint32_t offset=0); // Returns offset to substring or -1
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bool replace(uint32_t offset,uint32_t arg_length,const char *to,uint32_t length);
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bool replace(uint32_t offset,uint32_t arg_length,const String &to);
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inline bool append(char chr)
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if (str_length < Alloced_length)
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Ptr[str_length++]=chr;
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if (realloc(str_length+1))
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Ptr[str_length++]=chr;
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friend int sortcmp(const String *a,const String *b, const CHARSET_INFO * const 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_t arg_length);
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int charpos(int i,uint32_t offset=0);
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int reserve(uint32_t space_needed)
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return realloc(str_length + space_needed);
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int reserve(uint32_t space_needed, uint32_t grow_by);
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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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void q_append(const char c);
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void q_append(const uint32_t n);
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void q_append(double d);
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void q_append(double *d);
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void q_append(const char *data, uint32_t data_len);
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void write_at_position(int position, uint32_t value);
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/* Inline (general) functions used by the protocol functions */
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inline char *prep_append(uint32_t arg_length, uint32_t step_alloc)
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uint32_t new_length= arg_length + str_length;
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if (new_length > Alloced_length)
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if (realloc(new_length + step_alloc))
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uint32_t 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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inline bool append(const char *s, uint32_t arg_length, uint32_t step_alloc)
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uint32_t new_length= arg_length + str_length;
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if (new_length > Alloced_length && realloc(new_length + step_alloc))
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memcpy(Ptr+str_length, s, arg_length);
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str_length+= arg_length;
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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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return (s->alloced && Ptr >= s->Ptr && Ptr < s->Ptr + s->str_length);
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bool check_if_only_end_space(const CHARSET_INFO * const cs, char *str,
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} /* namespace drizzled */
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bool operator==(const drizzled::String &s1, const drizzled::String &s2);
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bool operator!=(const drizzled::String &s1, const drizzled::String &s2);
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#endif /* DRIZZLED_SQL_STRING_H */