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