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428
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1 /*
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2 * realpath.c -- canonicalize pathname by removing symlinks
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3 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
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771
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4 * Copyright (C) 2001 Ben Wing.
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428
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5 *
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6
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7 This file is part of XEmacs.
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8
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9 XEmacs is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 2, or (at your option) any
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12 later version.
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13
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14 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with XEmacs; see the file COPYING. If not, write to
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21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 Boston, MA 02111-1307, USA. */
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23
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24 /* Synched up with: Not in FSF. */
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25
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771
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26 /* This file has been Mule-ized, June 2001 by Ben Wing.
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27
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28 Everything in this file now works in terms of internal, not external,
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29 data. This is the only way to be safe, and it makes the code cleaner. */
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30
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428
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31 #include <config.h>
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446
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32 #include "lisp.h"
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442
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33
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558
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34 #include "sysfile.h"
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428
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35
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771
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36 #define MAX_READLINKS 32
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37
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819
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38 #if defined (HAVE_SYS_PARAM_H) && !defined (WIN32_NATIVE)
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39 #include <sys/param.h>
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40 #endif
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41
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42 #ifdef WIN32_NATIVE
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43 #include <direct.h>
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44 #endif
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45
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46 #include <sys/stat.h> /* for S_IFLNK */
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47
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48 #if defined(WIN32_NATIVE) || defined(CYGWIN)
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49 #define WIN32_FILENAMES
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50 #endif
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51
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446
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52 /* First char after start of absolute filename. */
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53 #define ABS_START(name) (name + ABS_LENGTH (name))
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54
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55 #if defined (WIN32_NATIVE)
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56 /* Length of start of absolute filename. */
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771
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57 # define ABS_LENGTH(name) (mswindows_abs_start (name))
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867
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58 static int mswindows_abs_start (const Ibyte *name);
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771
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59 # define readlink_and_correct_case mswindows_readlink_and_correct_case
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446
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60 #else
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61 # ifdef CYGWIN
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819
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62 # ifdef WIN32_FILENAMES
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63 # define ABS_LENGTH(name) (mswindows_abs_start (name))
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867
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64 static int mswindows_abs_start (const Ibyte * name);
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819
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65 # else
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66 # define ABS_LENGTH(name) (IS_DIRECTORY_SEP (*name) ? \
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67 (IS_DIRECTORY_SEP (name[1]) ? 2 : 1) : 0)
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68 # endif
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771
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69 # define readlink_and_correct_case cygwin_readlink_and_correct_case
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446
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70 # else
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71 # define ABS_LENGTH(name) (IS_DIRECTORY_SEP (*name) ? 1 : 0)
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771
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72 # define readlink_and_correct_case qxe_readlink
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446
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73 # endif /* CYGWIN */
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74 #endif /* WIN32_NATIVE */
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75
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76 #if defined (WIN32_NATIVE) || defined (CYGWIN)
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77 #include "syswindows.h"
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771
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78 /* "Emulate" readlink on mswindows - finds real name (i.e. correct
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79 case) of a file. (#### "readlink" is used extremely misleadingly
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80 here. This is much more like "truename"!) UNC servers and shares
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81 are lower-cased. Directories must be given without trailing
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82 '/'. One day, this could read Win2K's reparse points. */
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446
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83 static int
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867
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84 mswindows_readlink_and_correct_case (const Ibyte *name, Ibyte *buf,
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771
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85 int size)
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446
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86 {
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87 int len = 0;
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88 int err = 0;
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867
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89 const Ibyte *lastname;
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446
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90 int count = 0;
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867
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91 const Ibyte *tmp;
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771
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92 DECLARE_EISTRING (result);
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446
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93
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94 assert (*name);
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95
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96 /* Sort of check we have a valid filename. */
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771
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97 if (qxestrpbrk (name, "*?|<>\"") || qxestrlen (name) >= PATH_MAX)
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446
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98 {
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99 errno = EIO;
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100 return -1;
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101 }
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102
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103 /* Find start of filename */
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771
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104 lastname = name + qxestrlen (name);
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446
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105 while (lastname > name && !IS_DIRECTORY_SEP (lastname[-1]))
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106 --lastname;
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107
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108 /* Count slashes in unc path */
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109 if (ABS_LENGTH (name) == 2)
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110 for (tmp = name; *tmp; tmp++)
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111 if (IS_DIRECTORY_SEP (*tmp))
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112 count++;
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113
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114 if (count >= 2 && count < 4)
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115 {
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771
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116 eicpy_rawz (result, lastname);
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117 eilwr (result);
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446
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118 }
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119 else
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771
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120 {
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121 WIN32_FIND_DATAW find_data;
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122 Extbyte *nameext;
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123 HANDLE dir_handle;
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446
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124
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771
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125 C_STRING_TO_TSTR (name, nameext);
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126 dir_handle = qxeFindFirstFile (nameext, &find_data);
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127 if (dir_handle == INVALID_HANDLE_VALUE)
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446
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128 {
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771
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129 errno = ENOENT;
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130 return -1;
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446
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131 }
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771
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132 eicpy_ext (result, (Extbyte *) find_data.cFileName, Qmswindows_tstr);
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133 FindClose (dir_handle);
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134 }
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135
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136 if ((len = eilen (result)) < size)
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137 {
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138 DECLARE_EISTRING (eilastname);
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139
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140 eicpy_rawz (eilastname, lastname);
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141 if (eicmp_ei (eilastname, result) == 0)
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142 /* Signal that the name is already OK. */
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143 err = EINVAL;
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446
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144 else
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771
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145 memcpy (buf, eidata (result), len + 1);
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446
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146 }
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147 else
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771
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148 err = ENAMETOOLONG;
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446
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149
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150 errno = err;
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151 return err ? -1 : len;
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152 }
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153 #endif /* WIN32_NATIVE || CYGWIN */
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154
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155 #ifdef CYGWIN
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156 /* Call readlink and try to find out the correct case for the file. */
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157 static int
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867
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158 cygwin_readlink_and_correct_case (const Ibyte *name, Ibyte *buf,
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771
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159 int size)
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446
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160 {
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771
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161 int n = qxe_readlink (name, buf, size);
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462
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162 if (n < 0 && errno == EINVAL)
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446
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163 {
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164 /* The file may exist, but isn't a symlink. Try to find the
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165 right name. */
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867
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166 Ibyte *tmp =
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167 (Ibyte *) ALLOCA (cygwin_posix_to_win32_path_list_buf_size
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771
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168 ((char *) name));
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169 cygwin_posix_to_win32_path_list ((char *) name, (char *) tmp);
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170 n = mswindows_readlink_and_correct_case (tmp, buf, size);
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446
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171 }
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172 return n;
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173 }
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174 #endif /* CYGWIN */
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175
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819
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176 #ifdef WIN32_FILENAMES
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446
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177 #ifndef ELOOP
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178 #define ELOOP 10062 /* = WSAELOOP in winsock.h */
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179 #endif
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180 /* Length of start of absolute filename. */
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181 static int
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867
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182 mswindows_abs_start (const Ibyte *name)
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446
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183 {
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184 if (isalpha (*name) && IS_DEVICE_SEP (name[1])
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185 && IS_DIRECTORY_SEP (name[2]))
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186 return 3;
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187 else if (IS_DIRECTORY_SEP (*name))
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188 return IS_DIRECTORY_SEP (name[1]) ? 2 : 1;
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189 else
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190 return 0;
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191 }
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192 #endif /* WIN32_NATIVE */
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193
|
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771
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194 /* Mule Note: This function works with and returns
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195 internally-formatted strings. */
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440
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196
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867
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197 Ibyte *
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198 qxe_realpath (const Ibyte *path, Ibyte *resolved_path)
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428
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199 {
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867
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200 Ibyte copy_path[PATH_MAX];
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201 Ibyte *new_path = resolved_path;
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202 Ibyte *max_path;
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771
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203 #if defined (HAVE_READLINK) || defined (WIN32_NATIVE)
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428
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204 int readlinks = 0;
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867
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205 Ibyte link_path[PATH_MAX];
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428
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206 int n;
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446
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207 int abslen = ABS_LENGTH (path);
|
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428
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208 #endif
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209
|
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210 /* Make a copy of the source path since we may need to modify it. */
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|
771
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211 qxestrcpy (copy_path, path);
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428
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212 path = copy_path;
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213 max_path = copy_path + PATH_MAX - 2;
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|
446
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214
|
|
819
|
215 if (0)
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216 ;
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217 #ifdef WIN32_FILENAMES
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|
446
|
218 /* Check for c:/... or //server/... */
|
|
819
|
219 else if (abslen == 2 || abslen == 3)
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428
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220 {
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771
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221 qxestrncpy (new_path, path, abslen);
|
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462
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222 /* Make sure drive letter is lowercased. */
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223 if (abslen == 3)
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224 *new_path = tolower (*new_path);
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446
|
225 new_path += abslen;
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226 path += abslen;
|
|
428
|
227 }
|
|
819
|
228 #endif
|
|
|
229 #ifdef WIN32_NATIVE
|
|
446
|
230 /* No drive letter, but a beginning slash? Prepend drive letter. */
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|
|
231 else if (abslen == 1)
|
|
428
|
232 {
|
|
771
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233 get_initial_directory (new_path, PATH_MAX - 1);
|
|
428
|
234 new_path += 3;
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235 path++;
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|
|
236 }
|
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446
|
237 /* Just a path name, prepend the current directory */
|
|
819
|
238 else if (1)
|
|
428
|
239 {
|
|
771
|
240 get_initial_directory (new_path, PATH_MAX - 1);
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|
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241 new_path += qxestrlen (new_path);
|
|
446
|
242 if (!IS_DIRECTORY_SEP (new_path[-1]))
|
|
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243 *new_path++ = DIRECTORY_SEP;
|
|
428
|
244 }
|
|
|
245 #else
|
|
771
|
246 /* If it's a relative pathname use get_initial_directory for starters. */
|
|
819
|
247 else if (abslen == 0)
|
|
428
|
248 {
|
|
771
|
249 get_initial_directory (new_path, PATH_MAX - 1);
|
|
|
250 new_path += qxestrlen (new_path);
|
|
446
|
251 if (!IS_DIRECTORY_SEP (new_path[-1]))
|
|
|
252 *new_path++ = DIRECTORY_SEP;
|
|
428
|
253 }
|
|
|
254 else
|
|
|
255 {
|
|
446
|
256 /* Copy first directory sep. May have two on cygwin. */
|
|
771
|
257 qxestrncpy (new_path, path, abslen);
|
|
446
|
258 new_path += abslen;
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|
|
259 path += abslen;
|
|
428
|
260 }
|
|
|
261 #endif
|
|
|
262 /* Expand each slash-separated pathname component. */
|
|
|
263 while (*path != '\0')
|
|
|
264 {
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|
|
265 /* Ignore stray "/". */
|
|
446
|
266 if (IS_DIRECTORY_SEP (*path))
|
|
428
|
267 {
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|
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268 path++;
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|
|
269 continue;
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|
|
270 }
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|
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271
|
|
|
272 if (*path == '.')
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|
|
273 {
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|
|
274 /* Ignore ".". */
|
|
446
|
275 if (path[1] == '\0' || IS_DIRECTORY_SEP (path[1]))
|
|
428
|
276 {
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|
|
277 path++;
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|
|
278 continue;
|
|
|
279 }
|
|
|
280
|
|
442
|
281 /* Handle ".." */
|
|
|
282 if (path[1] == '.' &&
|
|
446
|
283 (path[2] == '\0' || IS_DIRECTORY_SEP (path[2])))
|
|
428
|
284 {
|
|
442
|
285 path += 2;
|
|
428
|
286
|
|
442
|
287 /* Ignore ".." at root. */
|
|
446
|
288 if (new_path == ABS_START (resolved_path))
|
|
442
|
289 continue;
|
|
428
|
290
|
|
442
|
291 /* Handle ".." by backing up. */
|
|
446
|
292 --new_path;
|
|
|
293 while (!IS_DIRECTORY_SEP (new_path[-1]))
|
|
|
294 --new_path;
|
|
442
|
295 continue;
|
|
428
|
296 }
|
|
|
297 }
|
|
|
298
|
|
|
299 /* Safely copy the next pathname component. */
|
|
446
|
300 while (*path != '\0' && !IS_DIRECTORY_SEP (*path))
|
|
428
|
301 {
|
|
|
302 if (path > max_path)
|
|
|
303 {
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|
|
304 errno = ENAMETOOLONG;
|
|
|
305 return NULL;
|
|
|
306 }
|
|
|
307 *new_path++ = *path++;
|
|
|
308 }
|
|
|
309
|
|
771
|
310 #if defined (HAVE_READLINK) || defined (WIN32_NATIVE)
|
|
|
311 /* See if latest pathname component is a symlink or needs case
|
|
|
312 correction. */
|
|
428
|
313 *new_path = '\0';
|
|
771
|
314 n = readlink_and_correct_case (resolved_path, link_path, PATH_MAX - 1);
|
|
428
|
315
|
|
|
316 if (n < 0)
|
|
|
317 {
|
|
771
|
318 /* EINVAL means the file exists but isn't a symlink or doesn't
|
|
|
319 need case correction. */
|
|
462
|
320 #ifdef CYGWIN
|
|
|
321 if (errno != EINVAL && errno != ENOENT)
|
|
|
322 #else
|
|
|
323 if (errno != EINVAL)
|
|
|
324 #endif
|
|
428
|
325 return NULL;
|
|
|
326 }
|
|
|
327 else
|
|
|
328 {
|
|
|
329 /* Protect against infinite loops. */
|
|
|
330 if (readlinks++ > MAX_READLINKS)
|
|
|
331 {
|
|
|
332 errno = ELOOP;
|
|
|
333 return NULL;
|
|
|
334 }
|
|
|
335
|
|
|
336 /* Note: readlink doesn't add the null byte. */
|
|
|
337 link_path[n] = '\0';
|
|
446
|
338
|
|
|
339 if (ABS_LENGTH (link_path) > 0)
|
|
428
|
340 /* Start over for an absolute symlink. */
|
|
446
|
341 new_path = resolved_path + ABS_LENGTH (link_path) - 1;
|
|
428
|
342 else
|
|
|
343 /* Otherwise back up over this component. */
|
|
446
|
344 for (--new_path; !IS_DIRECTORY_SEP (*new_path); --new_path)
|
|
|
345 assert (new_path > resolved_path);
|
|
428
|
346
|
|
|
347 /* Safe sex check. */
|
|
771
|
348 if (qxestrlen (path) + n >= PATH_MAX)
|
|
428
|
349 {
|
|
|
350 errno = ENAMETOOLONG;
|
|
|
351 return NULL;
|
|
|
352 }
|
|
|
353
|
|
|
354 /* Insert symlink contents into path. */
|
|
771
|
355 qxestrcat (link_path, path);
|
|
|
356 qxestrcpy (copy_path, link_path);
|
|
428
|
357 path = copy_path;
|
|
|
358 }
|
|
771
|
359 #endif /* HAVE_READLINK || WIN32_NATIVE */
|
|
446
|
360 *new_path++ = DIRECTORY_SEP;
|
|
428
|
361 }
|
|
|
362
|
|
|
363 /* Delete trailing slash but don't whomp a lone slash. */
|
|
771
|
364 if (new_path != ABS_START (resolved_path) &&
|
|
|
365 IS_DIRECTORY_SEP (new_path[-1]))
|
|
428
|
366 new_path--;
|
|
|
367
|
|
|
368 /* Make sure it's null terminated. */
|
|
|
369 *new_path = '\0';
|
|
446
|
370
|
|
428
|
371 return resolved_path;
|
|
|
372 }
|
