mirror of
https://github.com/MariaDB/server.git
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126 lines
3.5 KiB
C
126 lines
3.5 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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#include "mysys_priv.h"
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#include "mysys_err.h"
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#include "m_string.h"
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/*
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Change size of file.
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SYNOPSIS
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my_chsize()
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fd File descriptor
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new_length New file size
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filler If we don't have truncate, fill up all bytes after
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new_length with this character
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MyFlags Flags
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DESCRIPTION
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my_chsize() truncates file if shorter, else fill with the filler character
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RETURN VALUE
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0 Ok
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1 Error
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*/
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int my_chsize(File fd, my_off_t newlength, int filler, myf MyFlags)
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{
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DBUG_ENTER("my_chsize");
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DBUG_PRINT("my",("fd: %d length: %lu MyFlags: %d",fd,(ulong) newlength,
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MyFlags));
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/* if file is shorter, expand with null, else fill unused part with null */
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{
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my_off_t oldsize;
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char buff[IO_SIZE];
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oldsize = my_seek(fd, 0L, MY_SEEK_END, MYF(MY_WME+MY_FAE));
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DBUG_PRINT("info",("old_size: %ld", (ulong) oldsize));
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#ifdef __WIN__
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if (oldsize > newlength)
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{
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LARGE_INTEGER new_length;
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HANDLE win_file;
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win_file= (HANDLE)_get_osfhandle(fd);
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new_length.QuadPart = newlength;
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if (SetFilePointerEx(win_file,new_length,NULL,FILE_BEGIN))
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{
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if (SetEndOfFile(win_file))
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DBUG_RETURN(0);
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}
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DBUG_PRINT("error",("errno: %d",errno));
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my_errno=errno;
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if (MyFlags & MY_WME)
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my_error(EE_CANT_CHSIZE,MYF(ME_BELL+ME_WAITTANG),errno);
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DBUG_RETURN(1);
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}
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#elif defined(HAVE_CHSIZE)
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if (oldsize > newlength || filler == 0)
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{
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if (chsize(fd,(off_t) newlength))
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{
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DBUG_PRINT("error",("errno: %d",errno));
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my_errno=errno;
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if (MyFlags & MY_WME)
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my_error(EE_CANT_CHSIZE,MYF(ME_BELL+ME_WAITTANG),errno);
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DBUG_RETURN(1);
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}
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else
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{
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if (filler == 0)
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DBUG_RETURN(0);
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}
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}
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#elif defined(HAVE_FTRUNCATE)
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if (oldsize > newlength)
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{
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if (ftruncate(fd, (off_t) newlength))
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{
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my_errno=errno;
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DBUG_PRINT("error",("errno: %d",errno));
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if (MyFlags & MY_WME)
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my_error(EE_CANT_CHSIZE, MYF(ME_BELL+ME_WAITTANG), errno);
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DBUG_RETURN(1);
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}
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DBUG_RETURN(0);
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}
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#else
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if (oldsize > newlength)
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{ /* Fill diff with null */
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VOID(my_seek(fd, newlength, MY_SEEK_SET, MYF(MY_WME+MY_FAE)));
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swap(my_off_t, newlength, oldsize);
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}
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#endif
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/* Full file with 0 until it's as big as requested */
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bfill(buff, IO_SIZE, filler);
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while (newlength-oldsize > IO_SIZE)
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{
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if (my_write(fd,(byte*) buff,IO_SIZE,MYF(MY_NABP)))
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goto err;
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oldsize+= IO_SIZE;
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}
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if (my_write(fd,(byte*) buff,(uint) (newlength-oldsize),MYF(MY_NABP)))
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goto err;
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DBUG_RETURN(0);
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err:
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if (MyFlags & MY_WME)
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my_error(EE_CANT_CHSIZE,MYF(ME_BELL+ME_WAITTANG),my_errno);
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DBUG_PRINT("error",("errno: %d",my_errno));
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DBUG_RETURN(1);
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}
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} /* my_chsize */
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