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/*
Unix SMB/Netbios implementation.
Version 1.9.
read/write to a files_struct
Copyright (C) Andrew Tridgell 1992-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
/****************************************************************************
seek a file. Try to avoid the seek if possible
****************************************************************************/
SMB_OFF_T seek_file(files_struct *fsp,SMB_OFF_T pos)
{
SMB_OFF_T offset = 0;
SMB_OFF_T seek_ret;
if (fsp->print_file && lp_postscript(fsp->conn->service))
offset = 3;
seek_ret = sys_lseek(fsp->fd_ptr->fd,pos+offset,SEEK_SET);
if((seek_ret == -1) || (seek_ret != pos+offset)) {
DEBUG(0,("seek_file: sys_lseek failed. Error was %s\n", strerror(errno) ));
fsp->pos = -1;
return -1;
}
fsp->pos = seek_ret - offset;
DEBUG(10,("seek_file: requested pos = %.0f, new pos = %.0f\n",
(double)(pos+offset), (double)fsp->pos ));
return(fsp->pos);
}
/****************************************************************************
read from a file
****************************************************************************/
ssize_t read_file(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
{
ssize_t ret=0,readret;
#if USE_READ_PREDICTION
if (!fsp->can_write) {
ret = read_predict(fsp->fd_ptr->fd,pos,data,NULL,n);
data += ret;
n -= ret;
pos += ret;
}
#endif
#if WITH_MMAP
if (fsp->mmap_ptr) {
SMB_OFF_T num = (fsp->mmap_size > pos) ? (fsp->mmap_size - pos) : 0;
num = MIN(n,num);
if (num > 0) {
memcpy(data,fsp->mmap_ptr+pos,num);
data += num;
pos += num;
n -= num;
ret += num;
}
}
#endif
if (seek_file(fsp,pos) == -1) {
DEBUG(3,("read_file: Failed to seek to %.0f\n",(double)pos));
return(ret);
}
if (n > 0) {
readret = read(fsp->fd_ptr->fd,data,n);
if (readret > 0) ret += readret;
}
return(ret);
}
/****************************************************************************
write to a file
****************************************************************************/
ssize_t write_file(files_struct *fsp,char *data,size_t n)
{
if (!fsp->can_write) {
errno = EPERM;
return(0);
}
if (!fsp->modified) {
SMB_STRUCT_STAT st;
fsp->modified = True;
if (sys_fstat(fsp->fd_ptr->fd,&st) == 0) {
int dosmode = dos_mode(fsp->conn,fsp->fsp_name,&st);
if (MAP_ARCHIVE(fsp->conn) && !IS_DOS_ARCHIVE(dosmode)) {
file_chmod(fsp->conn,fsp->fsp_name,dosmode | aARCH,&st);
}
}
}
return(write_data(fsp->fd_ptr->fd,data,n));
}
/*******************************************************************
sync a file
********************************************************************/
void sync_file(connection_struct *conn, files_struct *fsp)
{
#ifdef HAVE_FSYNC
if(lp_strict_sync(SNUM(conn)))
fsync(fsp->fd_ptr->fd);
#endif
}
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