/contrib/cvs/src/no_diff.c

  1/*
  2 * Copyright (C) 1986-2005 The Free Software Foundation, Inc.
  3 *
  4 * Portions Copyright (C) 1998-2005 Derek Price, Ximbiot <http://ximbiot.com>,
  5 *                                  and others.
  6 *
  7 * Portions Copyright (C) 1992, Brian Berliner and Jeff Polk
  8 * Portions Copyright (C) 1989-1992, Brian Berliner
  9 * 
 10 * You may distribute under the terms of the GNU General Public License as
 11 * specified in the README file that comes with the CVS source distribution.
 12 * 
 13 * No Difference
 14 * 
 15 * The user file looks modified judging from its time stamp; however it needn't
 16 * be.  No_Difference() finds out whether it is or not. If it is not, it
 17 * updates the administration.
 18 * 
 19 * returns 0 if no differences are found and non-zero otherwise
 20 */
 21
 22#include "cvs.h"
 23#include <assert.h>
 24
 25int
 26No_Difference (finfo, vers)
 27    struct file_info *finfo;
 28    Vers_TS *vers;
 29{
 30    Node *p;
 31    int ret;
 32    char *ts, *options;
 33    int retcode = 0;
 34    char *tocvsPath;
 35
 36    /* If ts_user is "Is-modified", we can only conclude the files are
 37       different (since we don't have the file's contents).  */
 38    if (vers->ts_user != NULL
 39	&& strcmp (vers->ts_user, "Is-modified") == 0)
 40	return -1;
 41
 42    if (!vers->srcfile || !vers->srcfile->path)
 43	return (-1);			/* different since we couldn't tell */
 44
 45#ifdef PRESERVE_PERMISSIONS_SUPPORT
 46    /* If special files are in use, then any mismatch of file metadata
 47       information also means that the files should be considered different. */
 48    if (preserve_perms && special_file_mismatch (finfo, vers->vn_user, NULL))
 49	return 1;
 50#endif
 51
 52    if (vers->entdata && vers->entdata->options)
 53	options = xstrdup (vers->entdata->options);
 54    else
 55	options = xstrdup ("");
 56
 57    tocvsPath = wrap_tocvs_process_file (finfo->file);
 58    retcode = RCS_cmp_file( vers->srcfile, vers->vn_user, (char **)NULL,
 59                            (char *)NULL, options,
 60			    tocvsPath == NULL ? finfo->file : tocvsPath );
 61    if (retcode == 0)
 62    {
 63	/* no difference was found, so fix the entries file */
 64	ts = time_stamp (finfo->file);
 65	Register (finfo->entries, finfo->file,
 66		  vers->vn_user ? vers->vn_user : vers->vn_rcs, ts,
 67		  options, vers->tag, vers->date, (char *) 0);
 68#ifdef SERVER_SUPPORT
 69	if (server_active)
 70	{
 71	    /* We need to update the entries line on the client side.  */
 72	    server_update_entries
 73	      (finfo->file, finfo->update_dir, finfo->repository, SERVER_UPDATED);
 74	}
 75#endif
 76	free (ts);
 77
 78	/* update the entdata pointer in the vers_ts structure */
 79	p = findnode (finfo->entries, finfo->file);
 80	assert (p);
 81	vers->entdata = p->data;
 82
 83	ret = 0;
 84    }
 85    else
 86	ret = 1;			/* files were really different */
 87
 88    if (tocvsPath)
 89    {
 90	/* Need to call unlink myself because the noexec variable
 91	 * has been set to 1.  */
 92	if (trace)
 93	    (void) fprintf (stderr, "%s-> unlink (%s)\n",
 94			    CLIENT_SERVER_STR, tocvsPath);
 95	if ( CVS_UNLINK (tocvsPath) < 0)
 96	    error (0, errno, "could not remove %s", tocvsPath);
 97    }
 98
 99    free (options);
100    return (ret);
101}