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att
GitHub Repository: att/ast
 Path: blob/master/src/cmd/cs/vcs_src/vcs_checkout.c
1810 views
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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) 1990-2011 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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*                                                                      *

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

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/*

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 *	checkout()

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 */

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#include "vcs_cmd.h"

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#include "vcs_rscs.h"

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int checkout(rp, vp)

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	register rfile_t*	rp;

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	register version_t*	vp;

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{

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	register attr_t*	ap;

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	tag_t*			tp;

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	tag_t*			marker;

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	Sfio_t	*fsrc, *wtar, *rtar, *fdel;

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	char	*sbuf, *tbuf, *dbuf, magic[4];

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	long	nsrc, ntar;

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	int	len;

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	rdirent_t*	dir;

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	fsrc = wtar = rtar = fdel = NULL;

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	sbuf = dbuf = tbuf = NULL;	

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	ap = rp->ap;

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	if (vp->tp == NULL)

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	{

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		vp->tp = tp = (tag_t *)malloc(sizeof(tag_t));

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		TOBEGIN(rp->fd);

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		/*

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		if (lookup_tag(NULL, rp->fd, ap, vp->version, vp->domain, &tp, 0))

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		*/

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		if (search_tag(rp->fd, ap, vp->version, vp->domain, &tp, G_LINK, &dir))

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			return (-1);

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		if ((marker = getmarkerbyfrom(dir, vp->tp->version)))

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		{

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			char	buf[1024];

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			char*	s;

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			strcpy(buf, marker->version);

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			if ((s = strchr(buf, CHRMARKER)))

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			{

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				*s = '\0';

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				s++;

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			}

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			message((0, "Version %s has been check out and marked as version%s", s, buf));

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		}

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	}

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	else

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		tp = vp->tp;

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	/* get the base */

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	(void) TOBASE(rp->fd, ap);

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	nsrc = ap->basesize;

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	if ((sbuf = (char *) malloc(nsrc)) == NULL 	||

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	     sfread(rp->fd, sbuf, nsrc) != nsrc 		||

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	      !(fsrc = sfnew(NULL, sbuf, nsrc, -1, SF_STRING|SF_READ)))

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	{

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		rserrno = ERRBASE;

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		goto ERR_EXIT;

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	}

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	(void) sfseek(fsrc, 0L, 0);

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	if (ISBASE(tp))

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	{

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		sfmove(fsrc, vp->fd, -1, -1);

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		sfclose(fsrc);

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		free((char *)sbuf);

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		vp->tp = tp;

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		message((1, "check out from the base"));

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		return (0);

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	}

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	/* get the delta */

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	len = tp->dsize;

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	if (((dbuf = (char *) malloc(len)) == NULL) || sfseek(rp->fd, tp->del, 0) != tp->del || sfread(rp->fd, dbuf, len) != len || !(fdel = sfnew(NULL, dbuf, len, -1, SF_STRING|SF_READ)))

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	{

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		rserrno = ERRDELTA;	

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		goto ERR_EXIT;

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	}

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	/* get sizes */

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	(void) TOBEGIN(fdel);

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	if (sfread(fdel, magic,4)!=4 || sfgetc(fdel)<0 || (nsrc = sfgetu(fdel))<0 || (ntar = sfgetu(fdel))<0)

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	{

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		rserrno = ERRDELTA; 

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		goto ERR_EXIT;

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	}

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	(void) TOBEGIN(fdel);

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	/* set buffer for target */

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	tbuf = (char *)malloc(ntar);

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	if(!(rtar = sfnew(NULL,tbuf,ntar,-1,SF_STRING|SF_READ)) ||

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	   !(wtar = sfnew(NULL,tbuf,ntar,-1,SF_STRING|SF_WRITE)))

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	{

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		rserrno = NOMEM;

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		goto ERR_EXIT;

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	}

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	/* do the update */

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	if(update(fsrc, fdel, wtar, rtar) < 0)

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	{

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		rserrno = ERRUPDATE;

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		goto ERR_EXIT;

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	}

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	sfseek(rtar, 0L, 0);

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	sfmove(rtar, vp->fd, -1, -1);

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	sfclose(fdel); sfclose(rtar); sfclose(fsrc);

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	free((char *)dbuf); 

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	free((char *)sbuf);

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	free((char *)tbuf);

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	return (0);

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ERR_EXIT:

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	if (dbuf)	free((char *)dbuf);

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	if (sbuf)	free((char *)sbuf);

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	if (tbuf)	free((char *)tbuf);

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	if (fdel)	sfclose(fdel);

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	if (rtar)	sfclose(rtar);

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	if (fsrc)	sfclose(fsrc);

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	return (-1);

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}

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