a73bea0da8
set_file_size: watcom-specific implementation git-svn-id: svn://kolibrios.org@727 a494cfbc-eb01-0410-851d-a64ba20cac60
283 lines
8.8 KiB
C
283 lines
8.8 KiB
C
/****************************************************************************
|
|
*
|
|
* Open Watcom Project
|
|
*
|
|
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* This file contains Original Code and/or Modifications of Original
|
|
* Code as defined in and that are subject to the Sybase Open Watcom
|
|
* Public License version 1.0 (the 'License'). You may not use this file
|
|
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
|
|
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
|
|
* provided with the Original Code and Modifications, and is also
|
|
* available at www.sybase.com/developer/opensource.
|
|
*
|
|
* The Original Code and all software distributed under the License are
|
|
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
|
|
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
|
|
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
|
|
* NON-INFRINGEMENT. Please see the License for the specific language
|
|
* governing rights and limitations under the License.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* Description: C Runtime write() and _lwrite() implementation.
|
|
*
|
|
****************************************************************************/
|
|
|
|
|
|
#include "variety.h"
|
|
#include "int64.h"
|
|
#include <stdio.h>
|
|
#include <io.h>
|
|
#include <fcntl.h>
|
|
#include <malloc.h>
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
#include "iomode.h"
|
|
#include "fileacc.h"
|
|
#include "rtcheck.h"
|
|
#include "rtdata.h"
|
|
#include "seterrno.h"
|
|
#include "lseek.h"
|
|
#include "kolibri.h"
|
|
|
|
/*
|
|
The _lwrite function writes data to the specified file.
|
|
|
|
Note: This function is provided only for compatibility with 16-bit
|
|
versions of Windows. Win32-based applications should use the WriteFile
|
|
function.
|
|
|
|
UINT _lwrite(
|
|
HFILE hFile, // handle to file
|
|
LPCSTR lpBuffer, // write data buffer
|
|
UINT uBytes // number of bytes to write
|
|
);
|
|
*/
|
|
|
|
extern void __STKOVERFLOW();
|
|
|
|
/*
|
|
Win32 Note:
|
|
Note that it is not an error to set the file pointer to a position
|
|
beyond the end of the file. The size of the file does not increase
|
|
until you call the SetEndOfFile, WriteFile, or WriteFileEx function. A
|
|
write operation increases the size of the file to the file pointer
|
|
position plus the size of the buffer written, leaving the intervening
|
|
bytes uninitialized. Hence, the reason for zero-padding the file
|
|
to achieve POSIX conformance.
|
|
*/
|
|
|
|
/*
|
|
POSIX Note:
|
|
When writing to a file that does not support seek operations (pipe,
|
|
device, etc.), the O_APPEND flag is effectively ignored. POSIX does
|
|
not explicitly state this, but it is implied. Also, ESPIPE (illegal
|
|
seek error) is not listed for write(), only pwrite(). Hence we must
|
|
either not attempt to seek on such devices, or ignore the failures.
|
|
*/
|
|
|
|
#define PAD_SIZE 512
|
|
|
|
typedef union {
|
|
unsigned __int64 _64;
|
|
long _32[2];
|
|
} __i64;
|
|
|
|
static int zero_pad( int handle ) /* 09-jan-95 */
|
|
/*******************************/
|
|
{
|
|
int rc;
|
|
long curPos, eodPos;
|
|
long bytesToWrite;
|
|
unsigned writeAmt;
|
|
char zeroBuf[PAD_SIZE];
|
|
|
|
// Pad with zeros due to lseek() past EOF (POSIX)
|
|
curPos = __lseek( handle, 0L, SEEK_CUR ); /* current offset */
|
|
if( curPos == -1 )
|
|
return( -1 );
|
|
eodPos = __lseek( handle, 0L, SEEK_END ); /* end of data offset */
|
|
if( eodPos == -1 )
|
|
return( -1 );
|
|
|
|
if( curPos > eodPos ) {
|
|
bytesToWrite = curPos - eodPos; /* amount to pad by */
|
|
|
|
if( bytesToWrite > 0 ) { /* only write if needed */
|
|
memset( zeroBuf, 0x00, PAD_SIZE ); /* zero out a buffer */
|
|
do { /* loop until done */
|
|
if( bytesToWrite > PAD_SIZE )
|
|
writeAmt = 512;
|
|
else
|
|
writeAmt = (unsigned)bytesToWrite;
|
|
rc = write( handle, zeroBuf, writeAmt );
|
|
if( rc < 0 )
|
|
return( rc );
|
|
bytesToWrite -= writeAmt; /* more bytes written */
|
|
} while( bytesToWrite != 0 );
|
|
}
|
|
} else {
|
|
curPos = __lseek( handle, curPos, SEEK_SET );
|
|
if( curPos == -1 ) {
|
|
return( -1 );
|
|
}
|
|
}
|
|
|
|
return( 0 ); /* return success code */
|
|
}
|
|
|
|
/*
|
|
The os_write function returns 0 meaning no error, -1 meaning error, or
|
|
ENOSPC meaning no space left on device.
|
|
*/
|
|
|
|
typedef struct
|
|
{
|
|
char *name;
|
|
unsigned int offset;
|
|
}__file_handle;
|
|
|
|
static int os_write( int handle, const void *buffer, unsigned len, unsigned *amt )
|
|
/********************************************************************************/
|
|
{
|
|
__file_handle *fh;
|
|
int rc;
|
|
|
|
rc = 0;
|
|
|
|
fh = (__file_handle*) __getOSHandle( handle );
|
|
|
|
rc = write_file(fh->name,buffer,fh->offset,len,amt);
|
|
fh->offset+= *amt;
|
|
|
|
if( *amt != len )
|
|
{
|
|
rc = ENOSPC;
|
|
__set_errno( rc );
|
|
}
|
|
return( rc );
|
|
}
|
|
|
|
_WCRTLINK int write( int handle, const void *buffer, unsigned len )
|
|
/**********************************************************************/
|
|
{
|
|
unsigned iomode_flags;
|
|
char *buf;
|
|
unsigned buf_size;
|
|
unsigned len_written, i, j;
|
|
int rc2;
|
|
|
|
__file_handle *fh;
|
|
|
|
__handle_check( handle, -1 );
|
|
iomode_flags = __GetIOMode( handle );
|
|
if( iomode_flags == 0 )
|
|
{
|
|
__set_errno( EBADF );
|
|
return( -1 );
|
|
}
|
|
|
|
if( !(iomode_flags & _WRITE) ) {
|
|
__set_errno( EACCES ); /* changed from EBADF to EACCES 23-feb-89 */
|
|
return( -1 );
|
|
}
|
|
|
|
fh = (__file_handle*) __getOSHandle( handle );
|
|
|
|
// put a semaphore around our writes
|
|
|
|
_AccessFileH( handle );
|
|
if( (iomode_flags & _APPEND) && !(iomode_flags & _ISTTY) )
|
|
{
|
|
fh->offset = __lseek( handle, 0L, SEEK_END ); /* end of data offset */
|
|
}
|
|
|
|
len_written = 0;
|
|
rc2 = 0;
|
|
|
|
// Pad the file with zeros if necessary
|
|
if( iomode_flags & _FILEEXT ) {
|
|
// turn off file extended flag
|
|
__SetIOMode_nogrow( handle, iomode_flags&(~_FILEEXT) );
|
|
|
|
// It is not required to pad a file with zeroes on an NTFS file system;
|
|
// unfortunately it is required on FAT (and probably FAT32). (JBS)
|
|
rc2 = zero_pad( handle );
|
|
}
|
|
|
|
if( rc2 == 0 ) {
|
|
if( iomode_flags & _BINARY ) { /* if binary mode */
|
|
rc2 = os_write( handle, buffer, len, &len_written );
|
|
/* end of binary mode part */
|
|
} else { /* text mode */
|
|
i = stackavail();
|
|
if( i < 0x00b0 ) {
|
|
__STKOVERFLOW(); /* not enough stack space */
|
|
}
|
|
buf_size = 512;
|
|
if( i < (512 + 48) ) {
|
|
buf_size = 128;
|
|
}
|
|
|
|
buf = __alloca( buf_size );
|
|
|
|
j = 0;
|
|
for( i = 0; i < len; )
|
|
{
|
|
if( ((const char*)buffer)[i] == '\n' )
|
|
{
|
|
buf[j] = '\r';
|
|
++j;
|
|
if( j == buf_size )
|
|
{
|
|
rc2 = os_write( handle, buf, buf_size, &j );
|
|
if( rc2 == -1 )
|
|
break;
|
|
len_written += j;
|
|
if( rc2 == ENOSPC )
|
|
break;
|
|
len_written = i;
|
|
j = 0;
|
|
}
|
|
}
|
|
buf[j] = ((const char*)buffer)[i];
|
|
++i;
|
|
++j;
|
|
if( j == buf_size ) {
|
|
rc2 = os_write( handle, buf, buf_size, &j );
|
|
if( rc2 == -1 )
|
|
break;
|
|
len_written += j;
|
|
if( rc2 == ENOSPC )
|
|
break;
|
|
len_written = i;
|
|
j = 0;
|
|
}
|
|
}
|
|
if( j ) {
|
|
rc2 = os_write( handle, buf, j, &i );
|
|
if( rc2 == ENOSPC ) {
|
|
len_written += i;
|
|
} else {
|
|
len_written = len;
|
|
}
|
|
}
|
|
/* end of text mode part */
|
|
}
|
|
}
|
|
_ReleaseFileH( handle );
|
|
if( rc2 == -1 ) {
|
|
return( rc2 );
|
|
} else {
|
|
return( len_written );
|
|
}
|
|
}
|
|
|
|
|