contrib/cvs-1.12/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
  25 int
  26 No_Difference (struct file_info *finfo, Vers_TS *vers)
  27 {
  28     Node *p;
  29     int ret;
  30     char *ts, *options;
  31     int retcode = 0;
  32     char *tocvsPath;
  33
  34     /* If ts_user is "Is-modified", we can only conclude the files are
  35        different (since we don't have the file's contents).  */
  36     if (vers->ts_user != NULL
  37         && strcmp (vers->ts_user, "Is-modified") == 0)
  38         return -1;
  39
  40     if (!vers->srcfile || !vers->srcfile->path)
  41         return (-1);                    /* different since we couldn't tell */
  42
  43 #ifdef PRESERVE_PERMISSIONS_SUPPORT
  44     /* If special files are in use, then any mismatch of file metadata
  45        information also means that the files should be considered different. */
  46     if (preserve_perms && special_file_mismatch (finfo, vers->vn_user, NULL))
  47         return 1;
  48 #endif
  49
  50     if (vers->entdata && vers->entdata->options)
  51         options = xstrdup (vers->entdata->options);
  52     else
  53         options = xstrdup ("");
  54
  55     tocvsPath = wrap_tocvs_process_file (finfo->file);
  56     retcode = RCS_cmp_file (vers->srcfile, vers->vn_user, NULL, NULL, options,
  57                             tocvsPath == NULL ? finfo->file : tocvsPath);
  58     if (retcode == 0)
  59     {
  60         /* no difference was found, so fix the entries file */
  61         ts = time_stamp (finfo->file);
  62         Register (finfo->entries, finfo->file,
  63                   vers->vn_user ? vers->vn_user : vers->vn_rcs, ts,
  64                   options, vers->tag, vers->date, NULL);
  65 #ifdef SERVER_SUPPORT
  66         if (server_active)
  67         {
  68             /* We need to update the entries line on the client side.  */
  69             server_update_entries (finfo->file, finfo->update_dir,
  70                                    finfo->repository, SERVER_UPDATED);
  71         }
  72 #endif
  73         free (ts);
  74
  75         /* update the entdata pointer in the vers_ts structure */
  76         p = findnode (finfo->entries, finfo->file);
  77         assert (p);
  78         vers->entdata = p->data;
  79
  80         ret = 0;
  81     }
  82     else
  83         ret = 1;                        /* files were really different */
  84
  85     if (tocvsPath)
  86     {
  87         /* Need to call unlink myself because the noexec variable
  88          * has been set to 1.  */
  89         TRACE (TRACE_FUNCTION, "unlink (%s)", tocvsPath);
  90         if ( CVS_UNLINK (tocvsPath) < 0)
  91             error (0, errno, "could not remove %s", tocvsPath);
  92     }
  93
  94     free (options);
  95     return ret;
  96 }