126 lines
2.4 KiB
C
126 lines
2.4 KiB
C
/***
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*tell.c - find file position
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*
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* Copyright (c) 1985-1995, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* contains _tell() - find file position
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*
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*Revision History:
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* 09-02-83 RN initial version
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 03-13-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h> and fixed the copyright. Also, cleaned
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* up the formatting a bit.
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* 10-01-90 GJF New-style function declarator.
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* 01-17-91 GJF ANSI naming.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 02-15-95 GJF Appended Mac version of source file (somewhat cleaned
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* up), with appropriate #ifdef-s.
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*
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*******************************************************************************/
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#ifdef _WIN32
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#include <cruntime.h>
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#include <io.h>
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/***
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*long _tell(filedes) - find file position
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*
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*Purpose:
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* Gets the current position of the file pointer (no adjustment
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* for buffering).
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*
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*Entry:
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* int filedes - file handle of file
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*
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*Exit:
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* returns file position or -1L (sets errno) if bad file descriptor or
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* pipe
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*
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*Exceptions:
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*
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*******************************************************************************/
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long __cdecl _tell (
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int filedes
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)
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{
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return(_lseek(filedes,0L,1));
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}
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#else /* ndef _WIN32 */
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#if defined(_M_MPPC) || defined(_M_M68K)
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#include <cruntime.h>
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#include <stdio.h>
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#include <errno.h>
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#include <io.h>
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#include <internal.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <msdos.h>
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#include <macos\files.h>
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#include <macos\errors.h>
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/***
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*long _tell(fh) - find file position
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*
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*Purpose:
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* Gets the current position of the file pointer (no adjustment
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* for buffering).
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*
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*Entry:
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* int fh - file handle of file
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*
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*Exit:
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* returns file position or -1L (sets errno) if bad file descriptor or
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* pipe
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*
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*Exceptions:
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*
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*******************************************************************************/
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long __cdecl _tell (
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int fh
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)
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{
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ParamBlockRec parm;
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OSErr osErr;
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/* validate handle */
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if ((unsigned)fh >= (unsigned)_nfile ||
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!(_osfile[fh] & FOPEN) ||
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_osfile[fh] & FDEV)
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{
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/* out of range -- return error */
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errno = EBADF;
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_macerrno = 0;
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return -1;
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}
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memset(&parm, 0, sizeof(ParamBlockRec));
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parm.ioParam.ioRefNum = _osfhnd[fh];
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osErr = PBGetFPosSync(&parm);
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switch (osErr)
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{
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case noErr:
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return parm.ioParam.ioPosOffset;
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default:
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errno = EIO;
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return -1;
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}
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}
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#endif /* defined(_M_MPPC) || defined(_M_M68K) */
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#endif /* _WIN32 */
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