Mercurial > hg > octave-lojdl > gnulib-hg
annotate lib/rename.c @ 12094:67458384fb3f
rename: fix Solaris 10 bug
rename("file","name/") mistakenly succeeded. But since Solaris 10
already obeys POSIX behavior on rename("link/","name"), we avoid
blindly forcing GNU behavior of rejecting symlinks with trailing slash.
* m4/rename.m4 (gl_FUNC_RENAME): Detect Solaris bug.
* lib/rename.c (rpl_rename): Don't cripple POSIX behavior if this
was the only bug.
Signed-off-by: Eric Blake <ebb9@byu.net>
| author | Eric Blake <ebb9@byu.net> |
|---|---|
| date | Wed, 30 Sep 2009 21:57:58 -0600 |
| parents | b07a0a61b0c1 |
| children | 724dd32f13f7 |
| rev | line source |
|---|---|
| 12093 | 1 /* Work around rename bugs in some systems. |
|
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2 |
| 11972 | 3 Copyright (C) 2001, 2002, 2003, 2005, 2006, 2009 Free Software |
| 4 Foundation, Inc. | |
| 3099 | 5 |
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6 This program is free software: you can redistribute it and/or modify |
| 3099 | 7 it under the terms of the GNU General Public License as published by |
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8 the Free Software Foundation; either version 3 of the License, or |
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9 (at your option) any later version. |
| 3099 | 10 |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
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17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 3099 | 18 |
| 12093 | 19 /* Written by Volker Borchert, Eric Blake. */ |
| 3099 | 20 |
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21 #include <config.h> |
| 11972 | 22 |
| 23 #include <stdio.h> | |
| 24 | |
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25 #undef rename |
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26 |
| 11972 | 27 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
| 28 /* The mingw rename has problems with trailing slashes; it also | |
| 29 requires use of native Windows calls to allow atomic renames over | |
| 30 existing files. */ | |
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31 |
| 11972 | 32 # include <errno.h> |
| 33 | |
| 34 # define WIN32_LEAN_AND_MEAN | |
| 35 # include <windows.h> | |
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36 |
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37 /* Rename the file SRC to DST. This replacement is necessary on |
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38 Windows, on which the system rename function will not replace |
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39 an existing DST. */ |
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40 int |
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41 rpl_rename (char const *src, char const *dst) |
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42 { |
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43 int error; |
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44 |
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45 /* MoveFileEx works if SRC is a directory without any flags, |
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46 but fails with MOVEFILE_REPLACE_EXISTING, so try without |
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47 flags first. */ |
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48 if (MoveFileEx (src, dst, 0)) |
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49 return 0; |
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50 |
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51 /* Retry with MOVEFILE_REPLACE_EXISTING if the move failed |
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52 * due to the destination already existing. */ |
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53 error = GetLastError (); |
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54 if (error == ERROR_FILE_EXISTS || error == ERROR_ALREADY_EXISTS) |
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55 { |
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56 if (MoveFileEx (src, dst, MOVEFILE_REPLACE_EXISTING)) |
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57 return 0; |
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58 |
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59 error = GetLastError (); |
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60 } |
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61 |
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62 switch (error) |
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63 { |
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64 case ERROR_FILE_NOT_FOUND: |
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65 case ERROR_PATH_NOT_FOUND: |
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66 case ERROR_BAD_PATHNAME: |
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67 case ERROR_DIRECTORY: |
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68 errno = ENOENT; |
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69 break; |
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70 |
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71 case ERROR_ACCESS_DENIED: |
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72 case ERROR_SHARING_VIOLATION: |
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73 errno = EACCES; |
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74 break; |
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75 |
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76 case ERROR_OUTOFMEMORY: |
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77 errno = ENOMEM; |
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78 break; |
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79 |
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80 case ERROR_CURRENT_DIRECTORY: |
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81 errno = EBUSY; |
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82 break; |
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83 |
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84 case ERROR_NOT_SAME_DEVICE: |
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85 errno = EXDEV; |
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86 break; |
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87 |
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88 case ERROR_WRITE_PROTECT: |
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89 errno = EROFS; |
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90 break; |
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91 |
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92 case ERROR_WRITE_FAULT: |
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93 case ERROR_READ_FAULT: |
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94 case ERROR_GEN_FAILURE: |
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95 errno = EIO; |
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96 break; |
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97 |
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98 case ERROR_HANDLE_DISK_FULL: |
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99 case ERROR_DISK_FULL: |
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100 case ERROR_DISK_TOO_FRAGMENTED: |
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101 errno = ENOSPC; |
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102 break; |
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103 |
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104 case ERROR_FILE_EXISTS: |
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105 case ERROR_ALREADY_EXISTS: |
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106 errno = EEXIST; |
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107 break; |
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108 |
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109 case ERROR_BUFFER_OVERFLOW: |
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110 case ERROR_FILENAME_EXCED_RANGE: |
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111 errno = ENAMETOOLONG; |
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112 break; |
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113 |
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114 case ERROR_INVALID_NAME: |
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115 case ERROR_DELETE_PENDING: |
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116 errno = EPERM; /* ? */ |
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117 break; |
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118 |
| 11972 | 119 # ifndef ERROR_FILE_TOO_LARGE |
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120 /* This value is documented but not defined in all versions of windows.h. */ |
| 11972 | 121 # define ERROR_FILE_TOO_LARGE 223 |
| 122 # endif | |
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123 case ERROR_FILE_TOO_LARGE: |
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124 errno = EFBIG; |
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125 break; |
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126 |
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127 default: |
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128 errno = EINVAL; |
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129 break; |
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130 } |
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131 |
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132 return -1; |
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133 } |
| 11972 | 134 |
| 135 #else /* ! W32 platform */ | |
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136 |
| 11972 | 137 # if RENAME_DEST_EXISTS_BUG |
| 138 # error Please report your platform and this message to bug-gnulib@gnu.org. | |
| 12094 | 139 # elif RENAME_TRAILING_SLASH_SOURCE_BUG || RENAME_TRAILING_SLASH_DEST_BUG |
| 12093 | 140 |
| 141 # include <errno.h> | |
| 11972 | 142 # include <stdio.h> |
| 143 # include <stdlib.h> | |
| 144 # include <string.h> | |
| 12093 | 145 # include <sys/stat.h> |
| 11972 | 146 |
| 147 # include "dirname.h" | |
| 3099 | 148 |
| 12093 | 149 /* Rename the file SRC to DST, fixing any trailing slash bugs. */ |
| 3099 | 150 |
| 151 int | |
| 5907 | 152 rpl_rename (char const *src, char const *dst) |
| 3099 | 153 { |
| 12093 | 154 size_t src_len = strlen (src); |
| 155 size_t dst_len = strlen (dst); | |
| 156 char *src_temp = (char *) src; | |
| 157 char *dst_temp = (char *) dst; | |
| 158 bool src_slash; | |
| 159 bool dst_slash; | |
| 160 int ret_val = -1; | |
| 161 int rename_errno = ENOTDIR; | |
| 162 struct stat src_st; | |
| 163 struct stat dst_st; | |
| 164 | |
| 165 if (!src_len || !dst_len) | |
| 166 return rename (src, dst); /* Let strace see the ENOENT failure. */ | |
| 3099 | 167 |
| 12093 | 168 src_slash = src[src_len - 1] == '/'; |
| 169 dst_slash = dst[dst_len - 1] == '/'; | |
| 170 if (!src_slash && !dst_slash) | |
| 171 return rename (src, dst); | |
| 172 | |
| 173 /* Presence of a trailing slash requires directory semantics. If | |
| 174 the source does not exist, or if the destination cannot be turned | |
| 175 into a directory, give up now. Otherwise, strip trailing slashes | |
| 176 before calling rename. */ | |
| 177 if (lstat (src, &src_st)) | |
| 178 return -1; | |
| 179 if (lstat (dst, &dst_st)) | |
| 180 { | |
| 181 if (errno != ENOENT || !S_ISDIR (src_st.st_mode)) | |
| 182 return -1; | |
| 183 } | |
| 184 else if (!S_ISDIR (dst_st.st_mode)) | |
| 185 { | |
| 186 errno = ENOTDIR; | |
| 187 return -1; | |
| 188 } | |
| 189 else if (!S_ISDIR (src_st.st_mode)) | |
| 3099 | 190 { |
| 12093 | 191 errno = EISDIR; |
| 192 return -1; | |
| 3099 | 193 } |
| 194 | |
| 12094 | 195 # if RENAME_TRAILING_SLASH_SOURCE_BUG |
| 196 /* If the only bug was that a trailing slash was allowed on a | |
| 197 non-existing file destination, as in Solaris 10, then we've | |
| 198 already covered that situation. But if there is any problem with | |
| 199 a trailing slash on an existing source or destination, as in | |
| 200 Solaris 9, then we must strip the offending slash and check that | |
| 201 we have not encountered a symlink instead of a directory. | |
| 202 | |
| 203 Stripping a trailing slash interferes with POSIX semantics, where | |
| 204 rename behavior on a symlink with a trailing slash operates on | |
| 205 the corresponding target directory. We prefer the GNU semantics | |
| 206 of rejecting any use of a symlink with trailing slash, but do not | |
| 207 enforce them, since Solaris 10 is able to obey POSIX semantics | |
| 208 and there might be clients expecting it, as counter-intuitive as | |
| 209 those semantics are. | |
| 210 | |
| 211 Technically, we could also follow the POSIX behavior by chasing a | |
| 212 readlink trail, but that is harder to implement. */ | |
| 12093 | 213 if (src_slash) |
| 214 { | |
| 215 src_temp = strdup (src); | |
| 216 if (!src_temp) | |
| 217 { | |
| 218 /* Rather than rely on strdup-posix, we set errno ourselves. */ | |
| 219 rename_errno = ENOMEM; | |
| 220 goto out; | |
| 221 } | |
| 222 strip_trailing_slashes (src_temp); | |
| 223 if (lstat (src_temp, &src_st)) | |
| 224 { | |
| 225 rename_errno = errno; | |
| 226 goto out; | |
| 227 } | |
| 228 if (S_ISLNK (src_st.st_mode)) | |
| 229 goto out; | |
| 230 } | |
| 231 if (dst_slash) | |
| 232 { | |
| 233 dst_temp = strdup (dst); | |
| 234 if (!dst_temp) | |
| 235 { | |
| 236 rename_errno = ENOMEM; | |
| 237 goto out; | |
| 238 } | |
| 239 strip_trailing_slashes (dst_temp); | |
| 240 if (lstat (dst_temp, &dst_st)) | |
| 241 { | |
| 242 if (errno != ENOENT) | |
| 243 { | |
| 244 rename_errno = errno; | |
| 245 goto out; | |
| 246 } | |
| 247 } | |
| 248 else if (S_ISLNK (dst_st.st_mode)) | |
| 249 goto out; | |
| 250 } | |
| 12094 | 251 # endif /* RENAME_TRAILING_SLASH_SOURCE_BUG */ |
| 252 | |
| 12093 | 253 ret_val = rename (src_temp, dst_temp); |
| 254 rename_errno = errno; | |
| 255 out: | |
| 5907 | 256 if (src_temp != src) |
| 3099 | 257 free (src_temp); |
| 12093 | 258 if (dst_temp != dst) |
| 259 free (dst_temp); | |
| 260 errno = rename_errno; | |
|
3102
a17f2d7d7ee1
Include stdlib.h, string.h or strings.h, and xalloc.h.
Jim Meyering <jim@meyering.net>
parents:
3099
diff
changeset
|
261 return ret_val; |
| 3099 | 262 } |
| 12094 | 263 # endif /* RENAME_TRAILING_SLASH_*_BUG */ |
| 11972 | 264 #endif /* ! W32 platform */ |