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att
GitHub Repository: att/ast
 Path: blob/master/src/cmd/3d/copy.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1989-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Eduardo Krell <[email protected]>                   *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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#include "3d.h"

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#if _hdr_utime

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#include <utime.h>

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#else

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struct utimbuf

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{

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	time_t  actime;

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	time_t  modtime;

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};

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#endif

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#define COPYBUF		8096

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#if __sun__ || sun

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#if _lib_mmap

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#define COPYMAP		(32*COPYBUF)

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#endif

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#endif

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/*

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 * copy rfd to wfd

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 * return 0 if success, otherwise -1.

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 */

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int

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fs3d_copy(int rfd, int wfd, struct stat* st)

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{

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	register ssize_t	n;

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	ssize_t			filesize;

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	struct stat		stbuf;

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	struct utimbuf		ut;

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	char			buf[COPYBUF];

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#ifdef COPYMAP

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	off_t			offset;

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	size_t			munmapsize;

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	size_t			mapsize;

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	char*			mapbuf;

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#endif

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	if (!st && FSTAT(rfd, st = &stbuf)) return -1;

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	if (!S_ISREG(st->st_mode)) return 0;

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	if ((filesize = st->st_size) <= 0)

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		filesize = 1;

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#ifdef COPYMAP

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	mapsize = (filesize < COPYMAP) ? filesize : COPYMAP;

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	if ((filesize > COPYBUF) && ((mapbuf = mmap((caddr_t)0, mapsize, PROT_READ, MAP_SHARED, rfd, 0)) != ((caddr_t)-1)))

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	{

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		offset = 0;

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		munmapsize = mapsize;

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		for (;;)

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		{

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			if (write(wfd, mapbuf, mapsize) != mapsize)

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			{

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				munmap(mapbuf, munmapsize);

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				return -1;

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			}

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			filesize -= mapsize;

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			if (filesize <= 0) break;

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			offset += mapsize;

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			if (filesize < mapsize) mapsize = filesize;

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			if (mmap(mapbuf, mapsize, PROT_READ, MAP_SHARED|MAP_FIXED, rfd, offset) == (caddr_t)-1)

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			{

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				munmap(mapbuf, munmapsize);

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				return -1;

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			}

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		}

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		munmap(mapbuf, munmapsize);

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	}

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#endif

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	if (filesize > 0)

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	{

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		while ((n = read(rfd, buf, COPYBUF)) > 0)

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			if (write(wfd, buf, n) != n) 

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				return -1;

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		if (n < 0 || lseek(wfd, (off_t)0, 0)) return -1;

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	}

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	ut.actime = st->st_atime;

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	ut.modtime = st->st_mtime;

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	UTIME(state.path.name, &ut);

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	return 0;

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}

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