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91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
/* Copyright (C) 2004 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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#ifdef __GNUC__
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#pragma implementation
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#endif
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#include "buffer.h"
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#include <m_string.h>
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/*
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Puts the given string to the buffer.
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SYNOPSYS
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put_to_buffer()
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start_pos start position in the buffer
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string string to be put in the buffer
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len_arg the length of the string. This way we can avoid some
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strlens.
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DESCRIPTION
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The method puts a string into the buffer, starting from start_pos .
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In the case when the buffer is too small it reallocs the buffer. The
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total size of the buffer is restricted with 16.
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RETURN
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0 - ok
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1 - The buffer came to 16Mb barrier
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*/
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int Buffer::put_to_buffer(char *start_pos, const char *string, uint len_arg)
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{
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if (check_and_add(start_pos - buffer, len_arg))
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return 1;
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strnmov(start_pos, string, len_arg);
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return 0;
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}
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/*
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Checks whether the current buffer size is ok to put a string of the length
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"len_arg" starting from "position" and reallocs it if no.
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SYNOPSYS
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check_and_add()
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position the number starting byte on the buffer to store a buffer
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len_arg the length of the string.
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DESCRIPTION
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The method checks whether it is possible to pus a string of teh "len_arg"
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length into the buffer, starting from "position" byte. In the case when the
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buffer is too small it reallocs the buffer. The total size of the buffer is
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restricted with 16 Mb.
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RETURN
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0 - ok
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1 - The buffer came to 16Mb barrier
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*/
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int Buffer::check_and_add(uint position, uint len_arg)
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{
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if (position + len_arg >= MAX_BUFFER_SIZE)
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return 1;
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if (position + len_arg>= buffer_size)
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{
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buffer= (char *) realloc(buffer,
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min(MAX_BUFFER_SIZE,
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max((uint) buffer_size*1.5,
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position + len_arg)));
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buffer_size= (uint) buffer_size*1.5;
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}
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return 0;
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}
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