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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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1116
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4 * Copyright (C) 2001, 2002 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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1116
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35 #include "sysdir.h"
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428
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36
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771
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37 #define MAX_READLINKS 32
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38
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1116
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39 #ifdef WIN32_ANY
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446
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40 #include "syswindows.h"
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41 #ifndef ELOOP
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42 #define ELOOP 10062 /* = WSAELOOP in winsock.h */
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43 #endif
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1116
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44 #endif
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45
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446
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46 /* Length of start of absolute filename. */
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47 static int
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1116
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48 abs_start (const Ibyte *name)
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446
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49 {
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1116
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50 #ifdef WIN32_ANY
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446
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51 if (isalpha (*name) && IS_DEVICE_SEP (name[1])
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52 && IS_DIRECTORY_SEP (name[2]))
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53 return 3;
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54 else if (IS_DIRECTORY_SEP (*name))
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55 return IS_DIRECTORY_SEP (name[1]) ? 2 : 1;
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56 else
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57 return 0;
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1116
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58 #else /* not WIN32_ANY */
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59 return IS_DIRECTORY_SEP (*name) ? 1 : 0;
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60 #endif
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446
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61 }
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1116
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62
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63 /* Find real name of a file by resolving symbolic links and (under Windows)
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64 looking up the correct case of the file as it appears on the file
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65 system.
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66
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67 Under Windows, UNC servers and shares are lower-cased. Directories must
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68 be given without trailing '/'. One day, this could read Win2K's reparse
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69 points. */
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70
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71 static int
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72 readlink_and_correct_case (const Ibyte *name, Ibyte *buf,
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73 int size)
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74 {
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75 #ifndef WIN32_ANY
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76 return qxe_readlink (name, buf, size);
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77 #else
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78 # ifdef CYGWIN
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79 Ibyte *tmp;
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80 int n = qxe_readlink (name, buf, size);
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81 if (n >= 0 || errno != EINVAL)
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82 return n;
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83
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84 /* The file may exist, but isn't a symlink. Try to find the
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85 right name. */
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86 tmp = (Ibyte *) ALLOCA (cygwin_posix_to_win32_path_list_buf_size
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87 ((char *) name));
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88 cygwin_posix_to_win32_path_list ((char *) name, (char *) tmp);
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89 name = tmp;
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90 # endif
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91
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92 {
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93 int len = 0;
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94 int err = 0;
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95 const Ibyte *lastname;
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96 int count = 0;
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1204
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97 const Ibyte *nn;
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1116
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98 DECLARE_EISTRING (result);
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99
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100 assert (*name);
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101
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102 /* Sort of check we have a valid filename. */
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103 if (qxestrpbrk (name, "*?|<>\""))
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104 {
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105 errno = ENOENT;
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106 return -1;
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107 }
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108 else if (qxestrlen (name) >= PATH_MAX)
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109 {
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110 errno = ENAMETOOLONG;
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111 return -1;
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112 }
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113
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114 /* Find start of filename */
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115 lastname = name + qxestrlen (name);
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116 while (lastname > name && !IS_DIRECTORY_SEP (lastname[-1]))
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117 --lastname;
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118
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119 /* Count slashes in unc path */
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120 if (abs_start (name) == 2)
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1204
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121 for (nn = name; *nn; nn++)
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122 if (IS_DIRECTORY_SEP (*nn))
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1116
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123 count++;
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124
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125 if (count >= 2 && count < 4)
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126 {
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127 eicpy_rawz (result, lastname);
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128 eilwr (result);
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129 }
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130 else
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131 {
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132 WIN32_FIND_DATAW find_data;
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133 Extbyte *nameext;
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134 HANDLE dir_handle;
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135
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136 C_STRING_TO_TSTR (name, nameext);
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137 dir_handle = qxeFindFirstFile (nameext, &find_data);
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138 if (dir_handle == INVALID_HANDLE_VALUE)
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139 {
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140 errno = ENOENT;
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141 return -1;
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142 }
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143 eicpy_ext (result, (Extbyte *) find_data.cFileName, Qmswindows_tstr);
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144 FindClose (dir_handle);
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145 }
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146
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147 if ((len = eilen (result)) < size)
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148 {
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149 DECLARE_EISTRING (eilastname);
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150
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151 eicpy_rawz (eilastname, lastname);
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152 if (eicmp_ei (eilastname, result) == 0)
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153 /* Signal that the name is already OK. */
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154 err = EINVAL;
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155 else
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156 memcpy (buf, eidata (result), len + 1);
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157 }
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158 else
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159 err = ENAMETOOLONG;
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160
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161 errno = err;
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162 return err ? -1 : len;
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163 }
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164 #endif /* WIN32_ANY */
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165 }
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446
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166
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771
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167 /* Mule Note: This function works with and returns
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168 internally-formatted strings. */
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440
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169
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867
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170 Ibyte *
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171 qxe_realpath (const Ibyte *path, Ibyte *resolved_path)
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428
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172 {
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867
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173 Ibyte copy_path[PATH_MAX];
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174 Ibyte *new_path = resolved_path;
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175 Ibyte *max_path;
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1116
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176 #if defined (HAVE_READLINK) || defined (WIN32_ANY)
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428
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177 int readlinks = 0;
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867
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178 Ibyte link_path[PATH_MAX];
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428
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179 int n;
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1116
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180 int abslen = abs_start (path);
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428
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181 #endif
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182
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183 /* Make a copy of the source path since we may need to modify it. */
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771
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184 qxestrcpy (copy_path, path);
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428
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185 path = copy_path;
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186 max_path = copy_path + PATH_MAX - 2;
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446
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187
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819
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188 if (0)
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189 ;
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1116
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190 #ifdef WIN32_ANY
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446
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191 /* Check for c:/... or //server/... */
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988
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192 else if (abslen == 3 || abslen == 2)
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428
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193 {
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462
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194 /* Make sure drive letter is lowercased. */
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1116
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195 if (abslen == 3)
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196 {
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197 *new_path = tolower (*path);
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198 new_path++;
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199 path++;
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200 abslen--;
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201 }
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988
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202 /* Coerce directory chars. */
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1116
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203 while (abslen-- > 0)
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204 {
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205 if (IS_DIRECTORY_SEP (*path))
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206 *new_path++ = DIRECTORY_SEP;
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207 else
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208 *new_path++ = *path;
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209 path++;
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210 }
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428
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211 }
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819
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212 #endif
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213 #ifdef WIN32_NATIVE
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446
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214 /* No drive letter, but a beginning slash? Prepend drive letter. */
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215 else if (abslen == 1)
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428
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216 {
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771
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217 get_initial_directory (new_path, PATH_MAX - 1);
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428
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218 new_path += 3;
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219 path++;
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220 }
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446
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221 /* Just a path name, prepend the current directory */
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1116
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222 else
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428
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223 {
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771
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224 get_initial_directory (new_path, PATH_MAX - 1);
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225 new_path += qxestrlen (new_path);
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446
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226 if (!IS_DIRECTORY_SEP (new_path[-1]))
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227 *new_path++ = DIRECTORY_SEP;
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428
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228 }
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229 #else
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771
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230 /* If it's a relative pathname use get_initial_directory for starters. */
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819
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231 else if (abslen == 0)
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428
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232 {
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771
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233 get_initial_directory (new_path, PATH_MAX - 1);
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234 new_path += qxestrlen (new_path);
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446
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235 if (!IS_DIRECTORY_SEP (new_path[-1]))
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236 *new_path++ = DIRECTORY_SEP;
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428
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237 }
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238 else
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239 {
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446
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240 /* Copy first directory sep. May have two on cygwin. */
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771
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241 qxestrncpy (new_path, path, abslen);
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446
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242 new_path += abslen;
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243 path += abslen;
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428
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244 }
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245 #endif
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246 /* Expand each slash-separated pathname component. */
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247 while (*path != '\0')
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248 {
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249 /* Ignore stray "/". */
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446
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250 if (IS_DIRECTORY_SEP (*path))
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428
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251 {
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252 path++;
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253 continue;
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254 }
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255
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256 if (*path == '.')
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257 {
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258 /* Ignore ".". */
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446
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259 if (path[1] == '\0' || IS_DIRECTORY_SEP (path[1]))
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428
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260 {
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261 path++;
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262 continue;
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263 }
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264
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442
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265 /* Handle ".." */
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266 if (path[1] == '.' &&
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446
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267 (path[2] == '\0' || IS_DIRECTORY_SEP (path[2])))
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428
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268 {
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442
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269 path += 2;
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428
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270
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442
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271 /* Ignore ".." at root. */
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1116
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272 if (new_path == resolved_path + abs_start (resolved_path))
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442
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273 continue;
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428
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274
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442
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275 /* Handle ".." by backing up. */
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446
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276 --new_path;
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277 while (!IS_DIRECTORY_SEP (new_path[-1]))
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278 --new_path;
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442
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279 continue;
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428
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280 }
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281 }
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282
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283 /* Safely copy the next pathname component. */
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446
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284 while (*path != '\0' && !IS_DIRECTORY_SEP (*path))
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428
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285 {
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286 if (path > max_path)
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287 {
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288 errno = ENAMETOOLONG;
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289 return NULL;
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290 }
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291 *new_path++ = *path++;
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292 }
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293
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1116
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294 #if defined (HAVE_READLINK) || defined (WIN32_ANY)
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771
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295 /* See if latest pathname component is a symlink or needs case
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296 correction. */
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428
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297 *new_path = '\0';
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771
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298 n = readlink_and_correct_case (resolved_path, link_path, PATH_MAX - 1);
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428
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299
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300 if (n < 0)
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301 {
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771
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302 /* EINVAL means the file exists but isn't a symlink or doesn't
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303 need case correction. */
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1116
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304 #ifdef WIN32_ANY
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462
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305 if (errno != EINVAL && errno != ENOENT)
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306 #else
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307 if (errno != EINVAL)
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308 #endif
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428
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309 return NULL;
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310 }
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311 else
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312 {
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313 /* Protect against infinite loops. */
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314 if (readlinks++ > MAX_READLINKS)
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315 {
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316 errno = ELOOP;
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317 return NULL;
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318 }
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319
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320 /* Note: readlink doesn't add the null byte. */
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321 link_path[n] = '\0';
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446
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322
|
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1116
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323 if (abs_start (link_path) > 0)
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428
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324 /* Start over for an absolute symlink. */
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1116
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325 new_path = resolved_path + abs_start (link_path) - 1;
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428
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326 else
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327 /* Otherwise back up over this component. */
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446
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328 for (--new_path; !IS_DIRECTORY_SEP (*new_path); --new_path)
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329 assert (new_path > resolved_path);
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428
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330
|
|
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331 /* Safe sex check. */
|
|
771
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332 if (qxestrlen (path) + n >= PATH_MAX)
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428
|
333 {
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334 errno = ENAMETOOLONG;
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335 return NULL;
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336 }
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337
|
|
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338 /* Insert symlink contents into path. */
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|
771
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339 qxestrcat (link_path, path);
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|
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340 qxestrcpy (copy_path, link_path);
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|
428
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341 path = copy_path;
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|
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342 }
|
|
1116
|
343 #endif /* HAVE_READLINK || WIN32_ANY */
|
|
446
|
344 *new_path++ = DIRECTORY_SEP;
|
|
428
|
345 }
|
|
|
346
|
|
|
347 /* Delete trailing slash but don't whomp a lone slash. */
|
|
1116
|
348 if (new_path != resolved_path + abs_start (resolved_path) &&
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|
771
|
349 IS_DIRECTORY_SEP (new_path[-1]))
|
|
428
|
350 new_path--;
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|
|
351
|
|
|
352 /* Make sure it's null terminated. */
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|
|
353 *new_path = '\0';
|
|
446
|
354
|
|
428
|
355 return resolved_path;
|
|
|
356 }
|
