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/* 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; 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., 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_IMPLEMENTATION
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#pragma implementation // gcc: Class implementation
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#include <my_global.h>
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#include <floatingpoint.h>
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The following extern declarations are ok as these are interface functions
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required by the string function
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extern void sql_alloc(size_t size);
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extern void sql_element_free(void *ptr);
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#include "sql_string.h"
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/*****************************************************************************
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*****************************************************************************/
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bool String::real_alloc(uint32 arg_length)
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arg_length=ALIGN_SIZE(arg_length+1);
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if (Alloced_length < arg_length)
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if (!(Ptr=(char*) my_malloc(arg_length,MYF(MY_WME))))
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Alloced_length=arg_length;
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** Check that string is big enough. Set string[alloc_length] to 0
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bool String::realloc(uint32 alloc_length)
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uint32 len=ALIGN_SIZE(alloc_length+1);
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if (Alloced_length < len)
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if (!(new_ptr= (char*) my_realloc(Ptr,len,MYF(MY_WME))))
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return TRUE; // Signal error
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else if ((new_ptr= (char*) my_malloc(len,MYF(MY_WME))))
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if (str_length > len - 1)
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if (str_length) // Avoid bugs in memcpy on AIX
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memcpy(new_ptr,Ptr,str_length);
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new_ptr[str_length]=0;
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return TRUE; // Signal error
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Ptr[alloc_length]=0; // This make other funcs shorter
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bool String::set(longlong num, CHARSET_INFO *cs)
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uint l=20*cs->mbmaxlen+1;
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str_length=(uint32) (cs->cset->longlong10_to_str)(cs,Ptr,l,-10,num);
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bool String::set(ulonglong num, CHARSET_INFO *cs)
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uint l=20*cs->mbmaxlen+1;
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str_length=(uint32) (cs->cset->longlong10_to_str)(cs,Ptr,l,10,num);
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bool String::set(double num,uint decimals, CHARSET_INFO *cs)
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if (decimals >= NOT_FIXED_DEC)
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uint32 len= my_sprintf(buff,(buff, "%.15g",num));// Enough for a DATETIME
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return copy(buff, len, &my_charset_latin1, cs, &dummy_errors);
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VOID(fconvert(num,(int) decimals,&decpt,&sign,buff+1));
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if (!my_isdigit(&my_charset_latin1, buff[1]))
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return copy(pos,(uint32) strlen(pos), &my_charset_latin1, cs, &dummy_errors);
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if (alloc((uint32) ((uint32) decpt+3+decimals)))
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if ((uint32) -decpt > decimals)
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decpt= - (int) decimals;
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decimals=(uint32) ((int) decimals+decpt);
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str_length=(uint32) (to-Ptr);
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buff[sizeof(buff)-1]=0; // Safety
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snprintf(buff,sizeof(buff)-1, "%.*f",(int) decimals,num);
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sprintf(buff,"%.*f",(int) decimals,num);
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return copy(buff,(uint32) strlen(buff), &my_charset_latin1, cs,
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Alloced_length=0; // Force realloc
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return realloc(str_length);
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bool String::copy(const String &str)
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if (alloc(str.str_length))
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str_length=str.str_length;
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bmove(Ptr,str.Ptr,str_length); // May be overlapping
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str_charset=str.str_charset;
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bool String::copy(const char *str,uint32 arg_length, CHARSET_INFO *cs)
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if (alloc(arg_length))
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if ((str_length=arg_length))
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memcpy(Ptr,str,arg_length);
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Checks that the source string can be just copied to the destination string
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arg_length Length of string to copy.
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from_cs Character set to copy from
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to_cs Character set to copy to
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uint32 *offset Returns number of unaligned characters.
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0 No conversion needed
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1 Either character set conversion or adding leading zeros
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(e.g. for UCS-2) must be done
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to_cs may be NULL for "no conversion" if the system variable
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character_set_results is NULL.
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bool String::needs_conversion(uint32 arg_length,
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CHARSET_INFO *from_cs,
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(to_cs == &my_charset_bin) ||
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(to_cs == from_cs) ||
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my_charset_same(from_cs, to_cs) ||
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((from_cs == &my_charset_bin) &&
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(!(*offset=(arg_length % to_cs->mbminlen)))))
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Copy a multi-byte character sets with adding leading zeros.
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arg_length Length of string. This should NOT be dividable with
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offset arg_length % cs->mb_minlength
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cs Character set for 'str'
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For real multi-byte, ascii incompatible charactser sets,
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like UCS-2, add leading zeros if we have an incomplete character.
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will automatically be converted into
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bool String::copy_aligned(const char *str,uint32 arg_length, uint32 offset,
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/* How many bytes are in incomplete character */
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offset= cs->mbmaxlen - offset; /* How many zeros we should prepend */
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DBUG_ASSERT(offset && offset != cs->mbmaxlen);
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uint32 aligned_length= arg_length + offset;
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if (alloc(aligned_length))
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Note, this is only safe for little-endian UCS-2.
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If we add big-endian UCS-2 sometimes, this code
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will be more complicated. But it's OK for now.
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bzero((char*) Ptr, offset);
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memcpy(Ptr + offset, str, arg_length);
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Ptr[aligned_length]=0;
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/* str_length is always >= 0 as arg_length is != 0 */
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str_length= aligned_length;
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bool String::set_or_copy_aligned(const char *str,uint32 arg_length,
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/* How many bytes are in incomplete character */
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uint32 offset= (arg_length % cs->mbminlen);
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if (!offset) /* All characters are complete, just copy */
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set(str, arg_length, cs);
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return copy_aligned(str, arg_length, offset, cs);
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/* Copy with charset convertion */
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bool String::copy(const char *str, uint32 arg_length,
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CHARSET_INFO *from_cs, CHARSET_INFO *to_cs, uint *errors)
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if (!needs_conversion(arg_length, from_cs, to_cs, &offset))
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return copy(str, arg_length, to_cs);
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if ((from_cs == &my_charset_bin) && offset)
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return copy_aligned(str, arg_length, offset, to_cs);
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uint32 new_length= to_cs->mbmaxlen*arg_length;
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if (alloc(new_length))
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str_length=copy_and_convert((char*) Ptr, new_length, to_cs,
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str, arg_length, from_cs, errors);
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Set a string to the value of a latin1-string, keeping the original charset
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str String of a simple charset (latin1)
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arg_length Length of string
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If string object is of a simple character set, set it to point to the
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If not, make a copy and convert it to the new character set.
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1 Could not allocate result buffer
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bool String::set_ascii(const char *str, uint32 arg_length)
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if (str_charset->mbminlen == 1)
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set(str, arg_length, str_charset);
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return copy(str, arg_length, &my_charset_latin1, str_charset, &dummy_errors);
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/* This is used by mysql.cc */
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bool String::fill(uint32 max_length,char fill_char)
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if (str_length > max_length)
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Ptr[str_length=max_length]=0;
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if (realloc(max_length))
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bfill(Ptr+str_length,max_length-str_length,fill_char);
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str_length=max_length;
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void String::strip_sp()
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while (str_length && my_isspace(str_charset,Ptr[str_length-1]))
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bool String::append(const String &s)
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if (realloc(str_length+s.length()))
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memcpy(Ptr+str_length,s.ptr(),s.length());
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str_length+=s.length();
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Append an ASCII string to the a string of the current character set
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bool String::append(const char *s,uint32 arg_length)
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For an ASCII incompatible string, e.g. UCS-2, we need to convert
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if (str_charset->mbminlen > 1)
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uint32 add_length=arg_length * str_charset->mbmaxlen;
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if (realloc(str_length+ add_length))
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str_length+= copy_and_convert(Ptr+str_length, add_length, str_charset,
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s, arg_length, &my_charset_latin1,
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For an ASCII compatinble string we can just append.
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if (realloc(str_length+arg_length))
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memcpy(Ptr+str_length,s,arg_length);
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str_length+=arg_length;
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Append a 0-terminated ASCII string
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bool String::append(const char *s)
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return append(s, (uint) strlen(s));
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Append a string in the given charset to the string
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with character set recoding
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bool String::append(const char *s,uint32 arg_length, CHARSET_INFO *cs)
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if (needs_conversion(arg_length, cs, str_charset, &dummy_offset))
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uint32 add_length= arg_length / cs->mbminlen * str_charset->mbmaxlen;
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if (realloc(str_length + add_length))
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str_length+= copy_and_convert(Ptr+str_length, add_length, str_charset,
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s, arg_length, cs, &dummy_errors);
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if (realloc(str_length + arg_length))
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memcpy(Ptr + str_length, s, arg_length);
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str_length+= arg_length;
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bool String::append(FILE* file, uint32 arg_length, myf my_flags)
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if (realloc(str_length+arg_length))
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if (my_fread(file, (uchar*) Ptr + str_length, arg_length, my_flags))
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str_length+=arg_length;
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bool String::append(IO_CACHE* file, uint32 arg_length)
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if (realloc(str_length+arg_length))
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if (my_b_read(file, (uchar*) Ptr + str_length, arg_length))
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str_length+=arg_length;
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bool String::append_with_prefill(const char *s,uint32 arg_length,
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uint32 full_length, char fill_char)
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int t_length= arg_length > full_length ? arg_length : full_length;
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if (realloc(str_length + t_length))
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t_length= full_length - arg_length;
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bfill(Ptr+str_length, t_length, fill_char);
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str_length=str_length + t_length;
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append(s, arg_length);
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uint32 String::numchars()
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return str_charset->cset->numchars(str_charset, Ptr, Ptr+str_length);
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int String::charpos(int i,uint32 offset)
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return str_charset->cset->charpos(str_charset,Ptr+offset,Ptr+str_length,i);
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int String::strstr(const String &s,uint32 offset)
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if (s.length()+offset <= str_length)
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return ((int) offset); // Empty string is always found
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register const char *str = Ptr+offset;
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register const char *search=s.ptr();
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const char *end=Ptr+str_length-s.length()+1;
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const char *search_end=s.ptr()+s.length();
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if (*str++ == *search)
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i=(char*) str; j=(char*) search+1;
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while (j != search_end)
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if (*i++ != *j++) goto skip;
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return (int) (str-Ptr) -1;
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** Search string from end. Offset is offset to the end of string
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int String::strrstr(const String &s,uint32 offset)
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if (s.length() <= offset && offset <= str_length)
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return offset; // Empty string is always found
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register const char *str = Ptr+offset-1;
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register const char *search=s.ptr()+s.length()-1;
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const char *end=Ptr+s.length()-2;
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const char *search_end=s.ptr()-1;
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if (*str-- == *search)
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i=(char*) str; j=(char*) search-1;
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while (j != search_end)
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if (*i-- != *j--) goto skip;
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return (int) (i-Ptr) +1;
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Replace substring with string
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If wrong parameter or not enough memory, do nothing
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bool String::replace(uint32 offset,uint32 arg_length,const String &to)
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return replace(offset,arg_length,to.ptr(),to.length());
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bool String::replace(uint32 offset,uint32 arg_length,
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const char *to, uint32 to_length)
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long diff = (long) to_length-(long) arg_length;
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if (offset+arg_length <= str_length)
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memcpy(Ptr+offset,to,to_length);
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bmove(Ptr+offset+to_length,Ptr+offset+arg_length,
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str_length-offset-arg_length);
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if (realloc(str_length+(uint32) diff))
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bmove_upp((uchar*) Ptr+str_length+diff, (uchar*) Ptr+str_length,
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str_length-offset-arg_length);
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memcpy(Ptr+offset,to,to_length);
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str_length+=(uint32) diff;
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// added by Holyfoot for "geometry" needs
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int String::reserve(uint32 space_needed, uint32 grow_by)
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if (Alloced_length < str_length + space_needed)
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if (realloc(Alloced_length + max(space_needed, grow_by) - 1))
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void String::qs_append(const char *str, uint32 len)
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memcpy(Ptr + str_length, str, len + 1);
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void String::qs_append(double d)
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char *buff = Ptr + str_length;
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str_length+= my_sprintf(buff, (buff, "%.15g", d));
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void String::qs_append(double *d)
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float8get(ld, (char*) d);
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void String::qs_append(int i)
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char *buff= Ptr + str_length;
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char *end= int10_to_str(i, buff, -10);
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str_length+= (int) (end-buff);
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void String::qs_append(uint i)
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char *buff= Ptr + str_length;
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char *end= int10_to_str(i, buff, 10);
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str_length+= (int) (end-buff);
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Compare strings according to collation, without end space.
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Normally this is case sensitive comparison
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int sortcmp(const String *s,const String *t, CHARSET_INFO *cs)
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return cs->coll->strnncollsp(cs,
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(unsigned char *) s->ptr(),s->length(),
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(unsigned char *) t->ptr(),t->length(), 0);
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Compare strings byte by byte. End spaces are also compared.
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Strings are compared as a stream of unsigned chars
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int stringcmp(const String *s,const String *t)
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uint32 s_len=s->length(),t_len=t->length(),len=min(s_len,t_len);
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int cmp= memcmp(s->ptr(), t->ptr(), len);
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return (cmp) ? cmp : (int) (s_len - t_len);
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String *copy_if_not_alloced(String *to,String *from,uint32 from_length)
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if (from->Alloced_length >= from_length)
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if (from->alloced || !to || from == to)
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(void) from->realloc(from_length);
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if (to->realloc(from_length))
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return from; // Actually an error
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if ((to->str_length=min(from->str_length,from_length)))
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memcpy(to->Ptr,from->Ptr,to->str_length);
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to->str_charset=from->str_charset;
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/****************************************************************************
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****************************************************************************/
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copy a string from one character set to another
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to_cs Character set of result string
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from_length Length of from string
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from_cs From character set
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'to' must be big enough as form_length * to_cs->mbmaxlen
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length of bytes copied to 'to'
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copy_and_convert(char *to, uint32 to_length, CHARSET_INFO *to_cs,
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const char *from, uint32 from_length, CHARSET_INFO *from_cs,
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const uchar *from_end= (const uchar*) from+from_length;
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uchar *to_end= (uchar*) to+to_length;
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my_charset_conv_mb_wc mb_wc= from_cs->cset->mb_wc;
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my_charset_conv_wc_mb wc_mb= to_cs->cset->wc_mb;
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if ((cnvres= (*mb_wc)(from_cs, &wc, (uchar*) from,
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else if (cnvres == MY_CS_ILSEQ)
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else if (cnvres > MY_CS_TOOSMALL)
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A correct multibyte sequence detected
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But it doesn't have Unicode mapping.
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break; // Not enough characters
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if ((cnvres= (*wc_mb)(to_cs, wc, (uchar*) to, to_end)) > 0)
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else if (cnvres == MY_CS_ILUNI && wc != '?')
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*errors= error_count;
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return (uint32) (to - to_start);
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void String::print(String *str)
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char *st= (char*)Ptr, *end= st+str_length;
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for (; st < end; st++)
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str->append(STRING_WITH_LEN("\\\\"));
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str->append(STRING_WITH_LEN("\\0"));
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str->append(STRING_WITH_LEN("\\'"));
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str->append(STRING_WITH_LEN("\\n"));
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str->append(STRING_WITH_LEN("\\r"));
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str->append(STRING_WITH_LEN("\\z"));
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Exchange state of this object and argument.
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Target string will contain state of this object and vice versa.
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void String::swap(String &s)
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swap_variables(char *, Ptr, s.Ptr);
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swap_variables(uint32, str_length, s.str_length);
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swap_variables(uint32, Alloced_length, s.Alloced_length);
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swap_variables(bool, alloced, s.alloced);
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swap_variables(CHARSET_INFO*, str_charset, s.str_charset);