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annotate lib/same.c @ 4179:7dd6887fa0db

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Optimization: Avoid unnecessary stat() calls.
author Bruno Haible <bruno@clisp.org>
date Tue, 14 Jan 2003 13:51:17 +0000
parents 22d3032f0239
children 5c87af30c731
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1 /* Determine whether two file names refer to the same file.
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2 Copyright (C) 1997-2000, 2002-2003 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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17
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18 /* written by Jim Meyering */
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19
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20 #if HAVE_CONFIG_H
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21 # include <config.h>
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22 #endif
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23
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24 #include <stdio.h>
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25 #ifdef HAVE_UNISTD_H
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26 # include <unistd.h>
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27 #endif
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28 #if HAVE_STDLIB_H
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29 # include <stdlib.h>
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30 #endif
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31 #include <sys/types.h>
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32 #include <sys/stat.h>
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33 #include <ctype.h>
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34 #include <errno.h>
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35 #ifndef errno
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36 extern int errno;
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37 #endif
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38
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39 #if HAVE_STRING_H
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40 # include <string.h>
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41 #else
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42 # include <strings.h>
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43 #endif
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44
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45 #include "same.h"
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46 #include "dirname.h"
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47 #include "error.h"
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48 #include "xalloc.h"
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49
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50 #ifndef HAVE_DECL_FREE
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51 "this configure-time declaration test was not run"
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52 #endif
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53 #if !HAVE_DECL_FREE
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54 void free ();
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55 #endif
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56
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57 #define SAME_INODE(Stat_buf_1, Stat_buf_2) \
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58 ((Stat_buf_1).st_ino == (Stat_buf_2).st_ino \
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59 && (Stat_buf_1).st_dev == (Stat_buf_2).st_dev)
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60
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61 /* Return nonzero if SOURCE and DEST point to the same name in the same
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62 directory. */
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63
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64 int
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65 same_name (const char *source, const char *dest)
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66 {
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67 char *source_basename, *dest_basename;
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68 size_t source_baselen, dest_baselen;
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69
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70 /* Compare the basenames. */
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71 source_basename = base_name (source);
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72 dest_basename = base_name (dest);
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73 source_baselen = base_len (source_basename);
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74 dest_baselen = base_len (dest_basename);
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75 if (source_baselen == dest_baselen
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76 && memcmp (source_basename, dest_basename, dest_baselen) == 0)
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77 {
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78 struct stat source_dir_stats;
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79 struct stat dest_dir_stats;
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80 char *source_dirname, *dest_dirname;
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81
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82 /* Compare the directories (by comparing their inodes). */
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83 source_dirname = dir_name (source);
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84 dest_dirname = dir_name (dest);
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85
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86 if (stat (source_dirname, &source_dir_stats))
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87 {
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88 /* Shouldn't happen. */
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89 error (1, errno, "%s", source_dirname);
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90 }
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91
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92 if (stat (dest_dirname, &dest_dir_stats))
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93 {
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94 /* Shouldn't happen. */
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95 error (1, errno, "%s", dest_dirname);
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96 }
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97
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98 free (source_dirname);
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99 free (dest_dirname);
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100
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101 if (SAME_INODE (source_dir_stats, dest_dir_stats))
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102 return 1;
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103 }
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104
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105 return 0;
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106 }