101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
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/***
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*dupx.c - MAC _dup and _dup2 helper function
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*
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* Copyright (c) 1989-1995, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* helper function for _dup/_dup2 - opens a handle on a new handle
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*
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*Revision History:
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* 12-02-92 PLM Module created, based on OS2 version
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* 02-14-95 GJF Replaced _CALLTYPE1 with __cdecl.
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*
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*******************************************************************************/
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#include <cruntime.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 <stdlib.h>
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#include <string.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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#include <fltintrn.h>
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/***
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*int __dupx(fh1, fh2) - force handle 2 to refer to handle 1
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*
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*Purpose:
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* Forces file handle 2 to refer to the same file as file
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* handle 1. Handle 2 must be validated by the caller
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*
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*
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*Entry:
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* int fh1 - file handle to duplicate
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* int fh2 - file handle to assign to file handle 1
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*
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*Exit:
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* returns fh2 if successful, -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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int __cdecl __dupx (
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int fh1,
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int fh2
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)
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{
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OSErr osErr;
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FCBPBRec parmFCB;
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HParamBlockRec parmH;
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char st[32];
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/* validate handle */
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if ((unsigned)fh1 >= (unsigned)_nfile || !(_osfile[fh1] & FOPEN) ||
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_osfile[fh1] & 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(&parmFCB, '\0', sizeof(FCBPBRec));
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parmFCB.ioRefNum = _osfhnd[fh1];
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*st = sizeof(st) - 1;
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parmFCB.ioNamePtr = st;
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osErr = PBGetFCBInfoSync(&parmFCB);
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if (osErr != 0)
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{
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_dosmaperr(osErr);
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return -1;
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}
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/* try to open the file using Appleshare calls*/
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memset(&parmH, '\0', sizeof(HParamBlockRec));
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parmH.ioParam.ioNamePtr = parmFCB.ioNamePtr;
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parmH.ioParam.ioVRefNum = parmFCB.ioFCBVRefNum;
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parmH.accessParam.ioDenyModes = _osperm[fh1];
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parmH.fileParam.ioDirID = parmFCB.ioFCBParID;
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parmH.ioParam.ioMisc = NULL;
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osErr = PBHOpenDenySync(&parmH);
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if (osErr == paramErr)
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{
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/* Try local open */
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parmH.ioParam.ioPermssn = _osperm[fh1];
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osErr = PBHOpenSync(&parmH);
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}
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if (osErr != 0)
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{
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_dosmaperr(osErr);
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return -1;
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}
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_osfile[fh2] = _osfile[fh1];
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_osfhnd[fh2] = parmH.ioParam.ioRefNum;
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_osperm[fh2] = _osperm[fh1];
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return fh2;
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}
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