86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
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* Copyright (c) 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the rights
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* to redistribute these changes.
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*/
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/* ffilecopy -- very fast buffered file copy
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*
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* Usage: i = ffilecopy (here,there)
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* int i;
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* FILE *here, *there;
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*
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* Ffilecopy is a very fast routine to copy the rest of a buffered
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* input file to a buffered output file. Here and there are open
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* buffers for reading and writing (respectively); ffilecopy
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* performs a file-copy faster than you should expect to do it
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* yourself. Ffilecopy returns 0 if everything was OK; EOF if
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* there was any error. Normally, the input file will be left in
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* EOF state (feof(here) will return TRUE), and the output file will be
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* flushed (i.e. all data on the file rather in the core buffer).
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* It is not necessary to flush the output file before ffilecopy.
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*
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* HISTORY
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* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
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* Created for VAX.
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*
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*/
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#include <stdio.h>
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int filecopy();
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int ffilecopy (here,there)
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FILE *here, *there;
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{
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register int i, herefile, therefile;
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herefile = fileno(here);
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therefile = fileno(there);
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if (fflush (there) == EOF) /* flush pending output */
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return (EOF);
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#ifdef __FreeBSD__
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if ((here->_r) > 0) { /* flush buffered input */
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i = write (therefile, here->_p, here->_r);
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if (i != here->_r) return (EOF);
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here->_p = here->_bf._base;
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here->_r = 0;
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}
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#else
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if ((here->_cnt) > 0) { /* flush buffered input */
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i = write (therefile, here->_ptr, here->_cnt);
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if (i != here->_cnt) return (EOF);
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here->_ptr = here->_base;
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here->_cnt = 0;
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}
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#endif
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i = filecopy (herefile, therefile); /* fast file copy */
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if (i < 0) return (EOF);
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#ifdef __FreeBSD__
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(here->_flags) |= __SEOF; /* indicate EOF */
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#else
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(here->_flag) |= _IOEOF; /* indicate EOF */
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#endif
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return (0);
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}
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