156 lines
3.2 KiB
C
156 lines
3.2 KiB
C
/***
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*setmode.c - set file translation mode
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*
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* Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defined _setmode() - set file translation mode of a file
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*
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*Revision History:
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* 08-16-84 RN initial version
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* 10-29-87 JCR Multi-thread support
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 05-25-88 PHG Merged DLL and normal versions
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* 03-13-90 GJF Made calling type _CALLTYPE1, added #include
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* <cruntime.h>, removed #include <register.h> and
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* fixed the copyright. Also, cleaned up the formatting
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* a bit.
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* 04-04-90 GJF Added #include <io.h>.
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* 10-01-90 GJF New-style function declarators.
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* 12-04-90 GJF Appended Win32 version onto the source with #ifdef-s.
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* Two versions should be merged together, the differences
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* are trivial.
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* 12-06-90 SRW Changed to use _osfile and _osfhnd instead of _osfinfo
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* 01-17-91 GJF ANSI naming.
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* 02-13-92 GJF Replaced _nfile by _nhandle for Win32.
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*
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*******************************************************************************/
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#include <cruntime.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 <errno.h>
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#include <msdos.h>
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#include <os2dll.h>
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#include <stddef.h>
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#include <internal.h>
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/***
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*int _setmode(fh, mode) - set file translation mode
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*
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*Purpose:
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* changes file mode to text/binary, depending on mode arg. this affects
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* whether read's and write's on the file translate between CRLF and LF
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* or is untranslated
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*
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*Entry:
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* int fh - file handle to change mode on
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* int mode - file translation mode (one of O_TEXT and O_BINARY)
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*
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*Exit:
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* returns old file translation mode
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* returns -1 and sets errno if fails
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifdef MTHREAD /* multi-thread code calls _lk_setmode() */
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int _CALLTYPE1 _setmode (
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int fh,
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int mode
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)
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{
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int retval;
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#ifdef _WIN32_
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if ( (unsigned)fh >= (unsigned)_nhandle ) {
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#else
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if (fh < 0 || fh >= _nfile) {
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#endif
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errno = EBADF;
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return(-1);
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}
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/* lock the file */
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_lock_fh(fh);
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/* set the text/binary mode */
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retval = _setmode_lk(fh, mode);
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/* unlock the file */
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_unlock_fh(fh);
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/* Return to user (_setmode_lk sets errno, if needed) */
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return(retval);
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}
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/***
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*_setmode_lk() - Perform core setmode operation
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*
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*Purpose:
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* Core setmode code. Assumes:
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* (1) Caller has validated fh to make sure it's in range.
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* (2) Caller has locked the file handle.
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*
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* [See _setmode() description above.]
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*
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*Entry: [Same as _setmode()]
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*
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*Exit: [Same as _setmode()]
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*
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*Exceptions:
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*
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*******************************************************************************/
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int _CALLTYPE1 _setmode_lk (
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REG1 int fh,
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int mode
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)
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{
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int oldmode;
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#else /* non multi-thread code */
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int _CALLTYPE1 _setmode (
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REG1 int fh,
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int mode
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)
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{
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int oldmode;
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#ifdef _WIN32_
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if ( (unsigned)fh >= (unsigned)_nhandle ) {
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#else
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if (fh < 0 || fh >= _nfile) {
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#endif
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errno = EBADF;
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return(-1);
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}
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#endif /* now join common code */
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if (!(_osfile[fh] & FOPEN)) {
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errno = EBADF;
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return(-1);
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}
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else {
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oldmode = _osfile[fh] & FTEXT;
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if (mode == _O_BINARY)
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_osfile[fh] &= ~FTEXT;
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else if (mode == _O_TEXT)
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_osfile[fh] |= FTEXT;
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else {
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errno = EINVAL;
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return(-1);
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}
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}
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return(oldmode ? _O_TEXT : _O_BINARY);
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}
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