Mercurial > gnulib
annotate lib/fts.c @ 10482:e8d1a5b2c49c
fts: tweak inode comparison function
* lib/fts.c (fts_compare_ino): Sort on increasing, not decreasing
inode numbers, as documented.
SCALAR(0xeb1b20)
| author | Jim Meyering <meyering@redhat.com> |
|---|---|
| date | Fri, 26 Sep 2008 13:43:00 +0200 |
| parents | 47fe4e48e158 |
| children | 5e359fc738d5 |
| rev | line source |
|---|---|
| 5858 | 1 /* Traverse a file hierarchy. |
| 2 | |
|
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3 Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
| 5858 | 4 |
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5 This program is free software: you can redistribute it and/or modify |
| 5858 | 6 it under the terms of the GNU General Public License as published by |
|
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7 the Free Software Foundation; either version 3 of the License, or |
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8 (at your option) any later version. |
| 5858 | 9 |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
|
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 5858 | 17 |
| 18 /*- | |
| 19 * Copyright (c) 1990, 1993, 1994 | |
| 20 * The Regents of the University of California. All rights reserved. | |
| 21 * | |
| 22 * Redistribution and use in source and binary forms, with or without | |
| 23 * modification, are permitted provided that the following conditions | |
| 24 * are met: | |
| 25 * 1. Redistributions of source code must retain the above copyright | |
| 26 * notice, this list of conditions and the following disclaimer. | |
| 27 * 2. Redistributions in binary form must reproduce the above copyright | |
| 28 * notice, this list of conditions and the following disclaimer in the | |
| 29 * documentation and/or other materials provided with the distribution. | |
| 30 * 4. Neither the name of the University nor the names of its contributors | |
| 31 * may be used to endorse or promote products derived from this software | |
| 32 * without specific prior written permission. | |
| 33 * | |
| 34 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 35 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 36 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 37 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 38 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 39 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 40 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 41 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 42 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 43 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 44 * SUCH DAMAGE. | |
| 45 */ | |
| 46 | |
|
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47 #include <config.h> |
| 5858 | 48 |
| 49 #if defined(LIBC_SCCS) && !defined(lint) | |
| 50 static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94"; | |
| 51 #endif /* LIBC_SCCS and not lint */ | |
| 52 | |
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53 #include "fts_.h" |
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54 |
| 5858 | 55 #if HAVE_SYS_PARAM_H || defined _LIBC |
| 56 # include <sys/param.h> | |
| 57 #endif | |
| 58 #ifdef _LIBC | |
| 59 # include <include/sys/stat.h> | |
| 60 #else | |
| 61 # include <sys/stat.h> | |
| 62 #endif | |
| 63 #include <fcntl.h> | |
| 64 #include <errno.h> | |
| 65 #include "dirfd.h" | |
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66 #include <stdbool.h> |
| 5858 | 67 #include <stdlib.h> |
| 68 #include <string.h> | |
| 69 #include <unistd.h> | |
| 70 | |
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71 #if ! _LIBC |
| 7151 | 72 # include "fcntl--.h" |
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73 # include "lstat.h" |
| 7151 | 74 # include "openat.h" |
| 75 # include "unistd--.h" | |
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76 # include "same-inode.h" |
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77 #endif |
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78 |
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79 #include <dirent.h> |
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80 #ifndef _D_EXACT_NAMLEN |
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81 # define _D_EXACT_NAMLEN(dirent) strlen ((dirent)->d_name) |
| 5858 | 82 #endif |
| 83 | |
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84 #if HAVE_STRUCT_DIRENT_D_TYPE |
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85 /* True if the type of the directory entry D is known. */ |
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86 # define DT_IS_KNOWN(d) ((d)->d_type != DT_UNKNOWN) |
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87 /* True if the type of the directory entry D must be T. */ |
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88 # define DT_MUST_BE(d, t) ((d)->d_type == (t)) |
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89 #else |
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90 # define DT_IS_KNOWN(d) false |
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91 # define DT_MUST_BE(d, t) false |
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92 #endif |
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93 |
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94 enum |
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95 { |
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96 NOT_AN_INODE_NUMBER = 0 |
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97 }; |
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98 |
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99 #ifdef D_INO_IN_DIRENT |
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100 # define D_INO(dp) (dp)->d_ino |
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101 #else |
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102 /* Some systems don't have inodes, so fake them to avoid lots of ifdefs. */ |
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103 # define D_INO(dp) NOT_AN_INODE_NUMBER |
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104 #endif |
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105 |
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106 /* If there are more than this many entries in a directory, |
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107 and the conditions mentioned below are satisfied, then sort |
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108 the entries on inode number before any further processing. */ |
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109 #ifndef FTS_INODE_SORT_DIR_ENTRIES_THRESHOLD |
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110 # define FTS_INODE_SORT_DIR_ENTRIES_THRESHOLD 10000 |
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111 #endif |
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112 enum |
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113 { |
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114 _FTS_INODE_SORT_DIR_ENTRIES_THRESHOLD = FTS_INODE_SORT_DIR_ENTRIES_THRESHOLD |
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115 }; |
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116 |
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117 enum Fts_stat |
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118 { |
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119 FTS_NO_STAT_REQUIRED = 1, |
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120 FTS_STAT_REQUIRED = 2 |
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121 }; |
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122 |
| 5858 | 123 #ifdef _LIBC |
| 124 # undef close | |
| 125 # define close __close | |
| 126 # undef closedir | |
| 127 # define closedir __closedir | |
| 128 # undef fchdir | |
| 129 # define fchdir __fchdir | |
| 130 # undef open | |
| 131 # define open __open | |
| 132 # undef opendir | |
| 133 # define opendir __opendir | |
| 134 # undef readdir | |
| 135 # define readdir __readdir | |
| 136 #else | |
| 137 # undef internal_function | |
| 138 # define internal_function /* empty */ | |
| 139 #endif | |
| 140 | |
| 141 #ifndef __set_errno | |
| 142 # define __set_errno(Val) errno = (Val) | |
| 143 #endif | |
| 144 | |
| 145 #ifndef __attribute__ | |
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146 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) |
| 5858 | 147 # define __attribute__(x) /* empty */ |
| 148 # endif | |
| 149 #endif | |
| 150 | |
| 151 #ifndef ATTRIBUTE_UNUSED | |
| 152 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) | |
| 153 #endif | |
| 154 | |
| 7151 | 155 /* If this host provides the openat function, then we can avoid |
| 156 attempting to open "." in some initialization code below. */ | |
| 157 #ifdef HAVE_OPENAT | |
| 158 # define HAVE_OPENAT_SUPPORT 1 | |
| 159 #else | |
| 160 # define HAVE_OPENAT_SUPPORT 0 | |
| 161 #endif | |
| 5858 | 162 |
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163 #ifdef NDEBUG |
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164 # define fts_assert(expr) ((void) 0) |
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165 #else |
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166 # define fts_assert(expr) \ |
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167 do \ |
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168 { \ |
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169 if (!(expr)) \ |
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170 abort (); \ |
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171 } \ |
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172 while (false) |
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173 #endif |
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174 |
| 5858 | 175 static FTSENT *fts_alloc (FTS *, const char *, size_t) internal_function; |
| 176 static FTSENT *fts_build (FTS *, int) internal_function; | |
| 177 static void fts_lfree (FTSENT *) internal_function; | |
| 178 static void fts_load (FTS *, FTSENT *) internal_function; | |
| 179 static size_t fts_maxarglen (char * const *) internal_function; | |
| 180 static void fts_padjust (FTS *, FTSENT *) internal_function; | |
| 181 static bool fts_palloc (FTS *, size_t) internal_function; | |
| 182 static FTSENT *fts_sort (FTS *, FTSENT *, size_t) internal_function; | |
| 183 static unsigned short int fts_stat (FTS *, FTSENT *, bool) internal_function; | |
| 184 static int fts_safe_changedir (FTS *, FTSENT *, int, const char *) | |
| 185 internal_function; | |
| 186 | |
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187 #if GNULIB_FTS |
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188 # include "fts-cycle.c" |
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189 #else |
| 5872 | 190 static bool enter_dir (FTS *fts, FTSENT *ent) { return true; } |
| 191 static void leave_dir (FTS *fts, FTSENT *ent) {} | |
| 192 static bool setup_dir (FTS *fts) { return true; } | |
| 193 static void free_dir (FTS *fts) {} | |
| 194 #endif | |
| 195 | |
| 5858 | 196 #ifndef MAX |
| 197 # define MAX(a,b) ((a) > (b) ? (a) : (b)) | |
| 198 #endif | |
| 199 | |
| 200 #ifndef SIZE_MAX | |
| 201 # define SIZE_MAX ((size_t) -1) | |
| 202 #endif | |
| 203 | |
| 204 #ifndef O_DIRECTORY | |
| 205 # define O_DIRECTORY 0 | |
| 206 #endif | |
| 207 | |
| 208 #define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2]))) | |
| 7151 | 209 #define STREQ(a, b) (strcmp ((a), (b)) == 0) |
| 5858 | 210 |
| 211 #define CLR(opt) (sp->fts_options &= ~(opt)) | |
| 212 #define ISSET(opt) (sp->fts_options & (opt)) | |
| 213 #define SET(opt) (sp->fts_options |= (opt)) | |
| 214 | |
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215 /* FIXME: make this a function */ |
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216 #define RESTORE_INITIAL_CWD(sp) \ |
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217 (fd_ring_clear (&((sp)->fts_fd_ring)), \ |
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218 FCHDIR ((sp), (ISSET (FTS_CWDFD) ? AT_FDCWD : (sp)->fts_rfd))) |
| 7151 | 219 |
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220 /* FIXME: FTS_NOCHDIR is now misnamed. |
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221 Call it FTS_USE_FULL_RELATIVE_FILE_NAMES instead. */ |
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222 #define FCHDIR(sp, fd) \ |
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223 (!ISSET(FTS_NOCHDIR) && (ISSET(FTS_CWDFD) \ |
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224 ? (cwd_advance_fd ((sp), (fd), true), 0) \ |
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225 : fchdir (fd))) |
| 7151 | 226 |
| 5858 | 227 |
| 228 /* fts_build flags */ | |
|
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229 /* FIXME: make this an enum */ |
| 5858 | 230 #define BCHILD 1 /* fts_children */ |
| 231 #define BNAMES 2 /* fts_children, names only */ | |
| 232 #define BREAD 3 /* fts_read */ | |
| 233 | |
| 234 #if FTS_DEBUG | |
|
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235 # include <inttypes.h> |
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236 # include <stdint.h> |
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237 # include <stdio.h> |
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238 # include "getcwdat.h" |
| 5858 | 239 bool fts_debug = false; |
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240 # define Dprintf(x) do { if (fts_debug) printf x; } while (false) |
| 5858 | 241 #else |
| 242 # define Dprintf(x) | |
|
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243 # define fd_ring_check(x) |
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244 # define fd_ring_print(a, b, c) |
| 5858 | 245 #endif |
| 246 | |
| 247 #define LEAVE_DIR(Fts, Ent, Tag) \ | |
| 5872 | 248 do \ |
| 249 { \ | |
| 5858 | 250 Dprintf ((" %s-leaving: %s\n", Tag, (Ent)->fts_path)); \ |
| 5872 | 251 leave_dir (Fts, Ent); \ |
|
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252 fd_ring_check (Fts); \ |
| 5872 | 253 } \ |
| 254 while (false) | |
| 5858 | 255 |
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256 static void |
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257 fd_ring_clear (I_ring *fd_ring) |
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258 { |
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259 while ( ! i_ring_empty (fd_ring)) |
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260 { |
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261 int fd = i_ring_pop (fd_ring); |
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262 if (0 <= fd) |
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263 close (fd); |
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264 } |
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265 } |
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266 |
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267 /* Overload the fts_statp->st_size member (otherwise unused, when |
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268 fts_info is FTS_NSOK) to indicate whether fts_read should stat |
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269 this entry or not. */ |
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270 static void |
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271 fts_set_stat_required (FTSENT *p, bool required) |
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272 { |
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273 fts_assert (p->fts_info == FTS_NSOK); |
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274 p->fts_statp->st_size = (required |
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275 ? FTS_STAT_REQUIRED |
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276 : FTS_NO_STAT_REQUIRED); |
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277 } |
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278 |
| 7151 | 279 /* file-descriptor-relative opendir. */ |
| 280 /* FIXME: if others need this function, move it into lib/openat.c */ | |
| 281 static inline DIR * | |
| 282 internal_function | |
| 283 opendirat (int fd, char const *dir) | |
| 284 { | |
| 285 int new_fd = openat (fd, dir, O_RDONLY); | |
| 286 DIR *dirp; | |
| 287 | |
| 288 if (new_fd < 0) | |
| 289 return NULL; | |
| 290 dirp = fdopendir (new_fd); | |
| 291 if (dirp == NULL) | |
| 292 { | |
| 293 int saved_errno = errno; | |
| 294 close (new_fd); | |
| 295 errno = saved_errno; | |
| 296 } | |
| 297 return dirp; | |
| 298 } | |
| 299 | |
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300 /* Virtual fchdir. Advance SP's working directory file descriptor, |
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301 SP->fts_cwd_fd, to FD, and push the previous value onto the fd_ring. |
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302 CHDIR_DOWN_ONE is true if FD corresponds to an entry in the directory |
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303 open on sp->fts_cwd_fd; i.e., to move the working directory one level |
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304 down. */ |
| 7151 | 305 static void |
| 306 internal_function | |
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307 cwd_advance_fd (FTS *sp, int fd, bool chdir_down_one) |
| 7151 | 308 { |
| 309 int old = sp->fts_cwd_fd; | |
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310 fts_assert (old != fd || old == AT_FDCWD); |
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311 |
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312 if (chdir_down_one) |
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313 { |
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314 /* Push "old" onto the ring. |
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315 If the displaced file descriptor is non-negative, close it. */ |
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316 int prev_fd_in_slot = i_ring_push (&sp->fts_fd_ring, old); |
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317 fd_ring_print (sp, stderr, "post-push"); |
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318 if (0 <= prev_fd_in_slot) |
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319 close (prev_fd_in_slot); /* ignore any close failure */ |
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320 } |
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321 else if ( ! ISSET (FTS_NOCHDIR)) |
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322 { |
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323 if (0 <= old) |
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324 close (old); /* ignore any close failure */ |
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325 } |
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326 |
| 7151 | 327 sp->fts_cwd_fd = fd; |
| 328 } | |
| 329 | |
| 5858 | 330 /* Open the directory DIR if possible, and return a file |
| 331 descriptor. Return -1 and set errno on failure. It doesn't matter | |
| 332 whether the file descriptor has read or write access. */ | |
| 333 | |
| 7151 | 334 static inline int |
| 5858 | 335 internal_function |
| 7151 | 336 diropen (FTS const *sp, char const *dir) |
| 5858 | 337 { |
| 7151 | 338 int open_flags = (O_RDONLY | O_DIRECTORY | O_NOCTTY | O_NONBLOCK |
| 339 | (ISSET (FTS_PHYSICAL) ? O_NOFOLLOW : 0)); | |
| 340 | |
| 341 return (ISSET (FTS_CWDFD) | |
| 342 ? openat (sp->fts_cwd_fd, dir, open_flags) | |
| 343 : open (dir, open_flags)); | |
| 5858 | 344 } |
| 345 | |
| 346 FTS * | |
| 347 fts_open (char * const *argv, | |
| 348 register int options, | |
| 349 int (*compar) (FTSENT const **, FTSENT const **)) | |
| 350 { | |
| 351 register FTS *sp; | |
| 352 register FTSENT *p, *root; | |
| 353 register size_t nitems; | |
| 7151 | 354 FTSENT *parent = NULL; |
| 355 FTSENT *tmp = NULL; /* pacify gcc */ | |
| 5858 | 356 size_t len; |
|
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357 bool defer_stat; |
| 5858 | 358 |
| 359 /* Options check. */ | |
| 360 if (options & ~FTS_OPTIONMASK) { | |
| 361 __set_errno (EINVAL); | |
| 362 return (NULL); | |
| 363 } | |
| 7151 | 364 if ((options & FTS_NOCHDIR) && (options & FTS_CWDFD)) { |
| 365 __set_errno (EINVAL); | |
| 366 return (NULL); | |
| 367 } | |
| 368 if ( ! (options & (FTS_LOGICAL | FTS_PHYSICAL))) { | |
| 369 __set_errno (EINVAL); | |
| 370 return (NULL); | |
| 371 } | |
| 5858 | 372 |
| 373 /* Allocate/initialize the stream */ | |
| 374 if ((sp = malloc(sizeof(FTS))) == NULL) | |
| 375 return (NULL); | |
| 376 memset(sp, 0, sizeof(FTS)); | |
| 377 sp->fts_compar = compar; | |
| 378 sp->fts_options = options; | |
| 379 | |
| 380 /* Logical walks turn on NOCHDIR; symbolic links are too hard. */ | |
| 7151 | 381 if (ISSET(FTS_LOGICAL)) { |
| 5858 | 382 SET(FTS_NOCHDIR); |
| 7151 | 383 CLR(FTS_CWDFD); |
| 384 } | |
| 385 | |
| 386 /* Initialize fts_cwd_fd. */ | |
| 387 sp->fts_cwd_fd = AT_FDCWD; | |
| 388 if ( ISSET(FTS_CWDFD) && ! HAVE_OPENAT_SUPPORT) | |
| 389 { | |
| 390 /* While it isn't technically necessary to open "." this | |
| 391 early, doing it here saves us the trouble of ensuring | |
| 392 later (where it'd be messier) that "." can in fact | |
| 393 be opened. If not, revert to FTS_NOCHDIR mode. */ | |
| 394 int fd = open (".", O_RDONLY); | |
| 395 if (fd < 0) | |
| 396 { | |
| 397 /* Even if `.' is unreadable, don't revert to FTS_NOCHDIR mode | |
| 398 on systems like Linux+PROC_FS, where our openat emulation | |
| 399 is good enough. Note: on a system that emulates | |
| 400 openat via /proc, this technique can still fail, but | |
| 401 only in extreme conditions, e.g., when the working | |
| 402 directory cannot be saved (i.e. save_cwd fails) -- | |
|
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403 and that happens on Linux only when "." is unreadable |
| 7151 | 404 and the CWD would be longer than PATH_MAX. |
| 405 FIXME: once Linux kernel openat support is well established, | |
| 406 replace the above open call and this entire if/else block | |
| 407 with the body of the if-block below. */ | |
| 408 if ( openat_needs_fchdir ()) | |
| 409 { | |
| 410 SET(FTS_NOCHDIR); | |
| 411 CLR(FTS_CWDFD); | |
| 412 } | |
| 413 } | |
| 414 else | |
| 415 { | |
| 416 close (fd); | |
| 417 } | |
| 418 } | |
| 5858 | 419 |
| 420 /* | |
| 5907 | 421 * Start out with 1K of file name space, and enough, in any case, |
| 422 * to hold the user's file names. | |
| 5858 | 423 */ |
| 424 #ifndef MAXPATHLEN | |
| 425 # define MAXPATHLEN 1024 | |
| 426 #endif | |
|
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427 { |
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428 size_t maxarglen = fts_maxarglen(argv); |
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429 if (! fts_palloc(sp, MAX(maxarglen, MAXPATHLEN))) |
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430 goto mem1; |
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431 } |
| 5858 | 432 |
| 433 /* Allocate/initialize root's parent. */ | |
| 7151 | 434 if (*argv != NULL) { |
| 435 if ((parent = fts_alloc(sp, "", 0)) == NULL) | |
| 436 goto mem2; | |
| 437 parent->fts_level = FTS_ROOTPARENTLEVEL; | |
| 438 } | |
| 5858 | 439 |
|
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440 /* The classic fts implementation would call fts_stat with |
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441 a new entry for each iteration of the loop below. |
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442 If the comparison function is not specified or if the |
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443 FTS_DEFER_STAT option is in effect, don't stat any entry |
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444 in this loop. This is an attempt to minimize the interval |
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|
445 between the initial stat/lstat/fstatat and the point at which |
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446 a directory argument is first opened. This matters for any |
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|
447 directory command line argument that resides on a file system |
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26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
448 without genuine i-nodes. If you specify FTS_DEFER_STAT along |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
449 with a comparison function, that function must not access any |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
450 data via the fts_statp pointer. */ |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
451 defer_stat = (compar == NULL || ISSET(FTS_DEFER_STAT)); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
452 |
| 5858 | 453 /* Allocate/initialize root(s). */ |
| 454 for (root = NULL, nitems = 0; *argv != NULL; ++argv, ++nitems) { | |
| 5907 | 455 /* Don't allow zero-length file names. */ |
| 5858 | 456 if ((len = strlen(*argv)) == 0) { |
| 457 __set_errno (ENOENT); | |
| 458 goto mem3; | |
| 459 } | |
| 460 | |
| 461 if ((p = fts_alloc(sp, *argv, len)) == NULL) | |
| 462 goto mem3; | |
| 463 p->fts_level = FTS_ROOTLEVEL; | |
| 464 p->fts_parent = parent; | |
| 465 p->fts_accpath = p->fts_name; | |
|
7499
67ce0bed0a20
Fix a bug in yesterday's change.
Jim Meyering <jim@meyering.net>
parents:
7483
diff
changeset
|
466 /* Even when defer_stat is true, be sure to stat the first |
|
67ce0bed0a20
Fix a bug in yesterday's change.
Jim Meyering <jim@meyering.net>
parents:
7483
diff
changeset
|
467 command line argument, since fts_read (at least with |
|
67ce0bed0a20
Fix a bug in yesterday's change.
Jim Meyering <jim@meyering.net>
parents:
7483
diff
changeset
|
468 FTS_XDEV) requires that. */ |
|
67ce0bed0a20
Fix a bug in yesterday's change.
Jim Meyering <jim@meyering.net>
parents:
7483
diff
changeset
|
469 if (defer_stat && root != NULL) { |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
470 p->fts_info = FTS_NSOK; |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
471 fts_set_stat_required(p, true); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
472 } else { |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
473 p->fts_info = fts_stat(sp, p, false); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
474 } |
| 5858 | 475 |
| 476 /* | |
| 477 * If comparison routine supplied, traverse in sorted | |
| 478 * order; otherwise traverse in the order specified. | |
| 479 */ | |
| 480 if (compar) { | |
| 481 p->fts_link = root; | |
| 482 root = p; | |
| 483 } else { | |
| 484 p->fts_link = NULL; | |
| 485 if (root == NULL) | |
| 486 tmp = root = p; | |
| 487 else { | |
| 488 tmp->fts_link = p; | |
| 489 tmp = p; | |
| 490 } | |
| 491 } | |
| 492 } | |
| 493 if (compar && nitems > 1) | |
| 494 root = fts_sort(sp, root, nitems); | |
| 495 | |
| 496 /* | |
| 497 * Allocate a dummy pointer and make fts_read think that we've just | |
| 498 * finished the node before the root(s); set p->fts_info to FTS_INIT | |
| 499 * so that everything about the "current" node is ignored. | |
| 500 */ | |
| 501 if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL) | |
| 502 goto mem3; | |
| 503 sp->fts_cur->fts_link = root; | |
| 504 sp->fts_cur->fts_info = FTS_INIT; | |
| 5872 | 505 if (! setup_dir (sp)) |
|
7483
2433e5f6bfd0
* lib/fts.c (fts_open): Use consistent indentation.
Jim Meyering <jim@meyering.net>
parents:
7482
diff
changeset
|
506 goto mem3; |
| 5858 | 507 |
| 508 /* | |
| 509 * If using chdir(2), grab a file descriptor pointing to dot to ensure | |
| 5907 | 510 * that we can get back here; this could be avoided for some file names, |
| 5858 | 511 * but almost certainly not worth the effort. Slashes, symbolic links, |
| 512 * and ".." are all fairly nasty problems. Note, if we can't get the | |
| 513 * descriptor we run anyway, just more slowly. | |
| 514 */ | |
| 7151 | 515 if (!ISSET(FTS_NOCHDIR) && !ISSET(FTS_CWDFD) |
| 516 && (sp->fts_rfd = diropen (sp, ".")) < 0) | |
| 5858 | 517 SET(FTS_NOCHDIR); |
| 518 | |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
519 i_ring_init (&sp->fts_fd_ring, -1); |
| 5858 | 520 return (sp); |
| 521 | |
| 522 mem3: fts_lfree(root); | |
| 523 free(parent); | |
| 524 mem2: free(sp->fts_path); | |
| 525 mem1: free(sp); | |
| 526 return (NULL); | |
| 527 } | |
| 528 | |
| 529 static void | |
| 530 internal_function | |
| 531 fts_load (FTS *sp, register FTSENT *p) | |
| 532 { | |
| 533 register size_t len; | |
| 534 register char *cp; | |
| 535 | |
| 536 /* | |
| 537 * Load the stream structure for the next traversal. Since we don't | |
| 538 * actually enter the directory until after the preorder visit, set | |
| 539 * the fts_accpath field specially so the chdir gets done to the right | |
| 540 * place and the user can access the first node. From fts_open it's | |
| 5907 | 541 * known that the file name will fit. |
| 5858 | 542 */ |
| 543 len = p->fts_pathlen = p->fts_namelen; | |
| 544 memmove(sp->fts_path, p->fts_name, len + 1); | |
| 545 if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) { | |
| 546 len = strlen(++cp); | |
| 547 memmove(p->fts_name, cp, len + 1); | |
| 548 p->fts_namelen = len; | |
| 549 } | |
| 550 p->fts_accpath = p->fts_path = sp->fts_path; | |
| 551 } | |
| 552 | |
| 553 int | |
| 554 fts_close (FTS *sp) | |
| 555 { | |
| 556 register FTSENT *freep, *p; | |
| 557 int saved_errno = 0; | |
| 558 | |
| 559 /* | |
| 560 * This still works if we haven't read anything -- the dummy structure | |
| 561 * points to the root list, so we step through to the end of the root | |
| 562 * list which has a valid parent pointer. | |
| 563 */ | |
| 564 if (sp->fts_cur) { | |
| 565 for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) { | |
| 566 freep = p; | |
| 567 p = p->fts_link != NULL ? p->fts_link : p->fts_parent; | |
| 568 free(freep); | |
| 569 } | |
| 570 free(p); | |
| 571 } | |
| 572 | |
| 5907 | 573 /* Free up child linked list, sort array, file name buffer. */ |
| 5858 | 574 if (sp->fts_child) |
| 575 fts_lfree(sp->fts_child); | |
|
7396
6f79ccad009d
2006-10-02 Dmitry V. Levin <ldv@altlinux.org>
Jim Meyering <jim@meyering.net>
parents:
7302
diff
changeset
|
576 free(sp->fts_array); |
| 5858 | 577 free(sp->fts_path); |
| 578 | |
| 7151 | 579 if (ISSET(FTS_CWDFD)) |
| 580 { | |
| 581 if (0 <= sp->fts_cwd_fd) | |
| 582 close (sp->fts_cwd_fd); | |
| 583 } | |
| 584 else if (!ISSET(FTS_NOCHDIR)) | |
| 585 { | |
| 586 /* Return to original directory, save errno if necessary. */ | |
| 587 if (fchdir(sp->fts_rfd)) | |
| 588 saved_errno = errno; | |
| 589 close(sp->fts_rfd); | |
| 590 } | |
| 5858 | 591 |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
592 fd_ring_clear (&sp->fts_fd_ring); |
| 5872 | 593 free_dir (sp); |
| 5858 | 594 |
| 595 /* Free up the stream pointer. */ | |
| 596 free(sp); | |
| 597 | |
| 598 /* Set errno and return. */ | |
| 599 if (saved_errno) { | |
| 600 __set_errno (saved_errno); | |
| 601 return (-1); | |
| 602 } | |
| 603 | |
| 604 return (0); | |
| 605 } | |
| 606 | |
| 607 /* | |
| 5907 | 608 * Special case of "/" at the end of the file name so that slashes aren't |
| 609 * appended which would cause file names to be written as "....//foo". | |
| 5858 | 610 */ |
| 611 #define NAPPEND(p) \ | |
| 612 (p->fts_path[p->fts_pathlen - 1] == '/' \ | |
| 613 ? p->fts_pathlen - 1 : p->fts_pathlen) | |
| 614 | |
| 615 FTSENT * | |
| 616 fts_read (register FTS *sp) | |
| 617 { | |
| 618 register FTSENT *p, *tmp; | |
| 619 register unsigned short int instr; | |
| 620 register char *t; | |
| 621 | |
| 622 /* If finished or unrecoverable error, return NULL. */ | |
| 623 if (sp->fts_cur == NULL || ISSET(FTS_STOP)) | |
| 624 return (NULL); | |
| 625 | |
| 626 /* Set current node pointer. */ | |
| 627 p = sp->fts_cur; | |
| 628 | |
| 629 /* Save and zero out user instructions. */ | |
| 630 instr = p->fts_instr; | |
| 631 p->fts_instr = FTS_NOINSTR; | |
| 632 | |
| 633 /* Any type of file may be re-visited; re-stat and re-turn. */ | |
| 634 if (instr == FTS_AGAIN) { | |
| 635 p->fts_info = fts_stat(sp, p, false); | |
| 636 return (p); | |
| 637 } | |
| 638 Dprintf (("fts_read: p=%s\n", | |
| 639 p->fts_info == FTS_INIT ? "" : p->fts_path)); | |
| 640 | |
| 641 /* | |
| 642 * Following a symlink -- SLNONE test allows application to see | |
| 643 * SLNONE and recover. If indirecting through a symlink, have | |
| 644 * keep a pointer to current location. If unable to get that | |
| 645 * pointer, follow fails. | |
| 646 */ | |
| 647 if (instr == FTS_FOLLOW && | |
| 648 (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) { | |
| 649 p->fts_info = fts_stat(sp, p, true); | |
| 650 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
| 7151 | 651 if ((p->fts_symfd = diropen (sp, ".")) < 0) { |
| 5858 | 652 p->fts_errno = errno; |
| 653 p->fts_info = FTS_ERR; | |
| 654 } else | |
| 655 p->fts_flags |= FTS_SYMFOLLOW; | |
| 656 } | |
| 5872 | 657 goto check_for_dir; |
| 5858 | 658 } |
| 659 | |
| 660 /* Directory in pre-order. */ | |
| 661 if (p->fts_info == FTS_D) { | |
| 662 /* If skipped or crossed mount point, do post-order visit. */ | |
| 663 if (instr == FTS_SKIP || | |
| 664 (ISSET(FTS_XDEV) && p->fts_statp->st_dev != sp->fts_dev)) { | |
| 665 if (p->fts_flags & FTS_SYMFOLLOW) | |
| 666 (void)close(p->fts_symfd); | |
| 667 if (sp->fts_child) { | |
| 668 fts_lfree(sp->fts_child); | |
| 669 sp->fts_child = NULL; | |
| 670 } | |
| 671 p->fts_info = FTS_DP; | |
| 672 LEAVE_DIR (sp, p, "1"); | |
| 673 return (p); | |
| 674 } | |
| 675 | |
| 676 /* Rebuild if only read the names and now traversing. */ | |
| 677 if (sp->fts_child != NULL && ISSET(FTS_NAMEONLY)) { | |
| 678 CLR(FTS_NAMEONLY); | |
| 679 fts_lfree(sp->fts_child); | |
| 680 sp->fts_child = NULL; | |
| 681 } | |
| 682 | |
| 683 /* | |
| 684 * Cd to the subdirectory. | |
| 685 * | |
| 686 * If have already read and now fail to chdir, whack the list | |
| 687 * to make the names come out right, and set the parent errno | |
| 688 * so the application will eventually get an error condition. | |
| 689 * Set the FTS_DONTCHDIR flag so that when we logically change | |
| 690 * directories back to the parent we don't do a chdir. | |
| 691 * | |
| 692 * If haven't read do so. If the read fails, fts_build sets | |
| 693 * FTS_STOP or the fts_info field of the node. | |
| 694 */ | |
| 695 if (sp->fts_child != NULL) { | |
| 696 if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) { | |
| 697 p->fts_errno = errno; | |
| 698 p->fts_flags |= FTS_DONTCHDIR; | |
| 699 for (p = sp->fts_child; p != NULL; | |
| 700 p = p->fts_link) | |
| 701 p->fts_accpath = | |
| 702 p->fts_parent->fts_accpath; | |
| 703 } | |
| 704 } else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) { | |
| 705 if (ISSET(FTS_STOP)) | |
| 706 return (NULL); | |
| 707 /* If fts_build's call to fts_safe_changedir failed | |
| 708 because it was not able to fchdir into a | |
| 709 subdirectory, tell the caller. */ | |
|
9129
79b0e6e0f7ba
* lib/fts.c (fts_read): Upon failure to chdir into a subdirectory,
Jim Meyering <jim@meyering.net>
parents:
7853
diff
changeset
|
710 if (p->fts_errno && p->fts_info != FTS_DNR) |
| 5858 | 711 p->fts_info = FTS_ERR; |
| 712 LEAVE_DIR (sp, p, "2"); | |
| 713 return (p); | |
| 714 } | |
| 715 p = sp->fts_child; | |
| 716 sp->fts_child = NULL; | |
| 717 goto name; | |
| 718 } | |
| 719 | |
| 720 /* Move to the next node on this level. */ | |
| 721 next: tmp = p; | |
| 722 if ((p = p->fts_link) != NULL) { | |
|
7853
9ddbddb3fc43
fts.c: a small readability/maintainability improvement
Jim Meyering <jim@meyering.net>
parents:
7797
diff
changeset
|
723 sp->fts_cur = p; |
| 5858 | 724 free(tmp); |
| 725 | |
| 726 /* | |
| 727 * If reached the top, return to the original directory (or | |
| 5907 | 728 * the root of the tree), and load the file names for the next |
| 729 * root. | |
| 5858 | 730 */ |
| 731 if (p->fts_level == FTS_ROOTLEVEL) { | |
| 7151 | 732 if (RESTORE_INITIAL_CWD(sp)) { |
| 5858 | 733 SET(FTS_STOP); |
| 734 return (NULL); | |
| 735 } | |
| 736 fts_load(sp, p); | |
| 5872 | 737 goto check_for_dir; |
| 5858 | 738 } |
| 739 | |
| 740 /* | |
| 741 * User may have called fts_set on the node. If skipped, | |
| 742 * ignore. If followed, get a file descriptor so we can | |
| 743 * get back if necessary. | |
| 744 */ | |
| 745 if (p->fts_instr == FTS_SKIP) | |
| 746 goto next; | |
| 747 if (p->fts_instr == FTS_FOLLOW) { | |
| 748 p->fts_info = fts_stat(sp, p, true); | |
| 749 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
| 7151 | 750 if ((p->fts_symfd = diropen (sp, ".")) < 0) { |
| 5858 | 751 p->fts_errno = errno; |
| 752 p->fts_info = FTS_ERR; | |
| 753 } else | |
| 754 p->fts_flags |= FTS_SYMFOLLOW; | |
| 755 } | |
| 756 p->fts_instr = FTS_NOINSTR; | |
| 757 } | |
| 758 | |
| 759 name: t = sp->fts_path + NAPPEND(p->fts_parent); | |
| 760 *t++ = '/'; | |
| 761 memmove(t, p->fts_name, p->fts_namelen + 1); | |
| 5872 | 762 check_for_dir: |
|
7853
9ddbddb3fc43
fts.c: a small readability/maintainability improvement
Jim Meyering <jim@meyering.net>
parents:
7797
diff
changeset
|
763 sp->fts_cur = p; |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
764 if (p->fts_info == FTS_NSOK) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
765 { |
|
7786
f79f76e0b6f7
Use a more robust test for a "can't happen" condition.
Jim Meyering <jim@meyering.net>
parents:
7785
diff
changeset
|
766 if (p->fts_statp->st_size == FTS_STAT_REQUIRED) |
|
f79f76e0b6f7
Use a more robust test for a "can't happen" condition.
Jim Meyering <jim@meyering.net>
parents:
7785
diff
changeset
|
767 p->fts_info = fts_stat(sp, p, false); |
|
f79f76e0b6f7
Use a more robust test for a "can't happen" condition.
Jim Meyering <jim@meyering.net>
parents:
7785
diff
changeset
|
768 else |
|
f79f76e0b6f7
Use a more robust test for a "can't happen" condition.
Jim Meyering <jim@meyering.net>
parents:
7785
diff
changeset
|
769 fts_assert (p->fts_statp->st_size == FTS_NO_STAT_REQUIRED); |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
770 } |
|
7707
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
771 |
| 5858 | 772 if (p->fts_info == FTS_D) |
| 5872 | 773 { |
|
7707
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
774 /* Now that P->fts_statp is guaranteed to be valid, |
|
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
775 if this is a command-line directory, record its |
|
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
776 device number, to be used for FTS_XDEV. */ |
|
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
777 if (p->fts_level == FTS_ROOTLEVEL) |
|
3f57a32346a2
* lib/fts.c (fts_load): Don't set sp->fts_dev here, since
Jim Meyering <jim@meyering.net>
parents:
7684
diff
changeset
|
778 sp->fts_dev = p->fts_statp->st_dev; |
|
7635
7f65b3a0e7a4
* lib/fts.c [FTS_DEBUG]: Don't try to print a pointer via %s.
Jim Meyering <jim@meyering.net>
parents:
7623
diff
changeset
|
779 Dprintf ((" entering: %s\n", p->fts_path)); |
| 5872 | 780 if (! enter_dir (sp, p)) |
| 781 { | |
| 782 __set_errno (ENOMEM); | |
| 783 return NULL; | |
| 784 } | |
| 785 } | |
| 786 return p; | |
| 5858 | 787 } |
| 788 | |
| 789 /* Move up to the parent node. */ | |
| 790 p = tmp->fts_parent; | |
|
7853
9ddbddb3fc43
fts.c: a small readability/maintainability improvement
Jim Meyering <jim@meyering.net>
parents:
7797
diff
changeset
|
791 sp->fts_cur = p; |
| 5858 | 792 free(tmp); |
| 793 | |
| 794 if (p->fts_level == FTS_ROOTPARENTLEVEL) { | |
| 795 /* | |
| 796 * Done; free everything up and set errno to 0 so the user | |
| 797 * can distinguish between error and EOF. | |
| 798 */ | |
| 799 free(p); | |
| 800 __set_errno (0); | |
| 801 return (sp->fts_cur = NULL); | |
| 802 } | |
| 803 | |
|
7785
3246679850d5
Slight readability improvement: use an assert-like macro
Jim Meyering <jim@meyering.net>
parents:
7707
diff
changeset
|
804 fts_assert (p->fts_info != FTS_NSOK); |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
805 |
| 5907 | 806 /* NUL terminate the file name. */ |
| 5858 | 807 sp->fts_path[p->fts_pathlen] = '\0'; |
| 808 | |
| 809 /* | |
| 7151 | 810 * Return to the parent directory. If at a root node, restore |
| 811 * the initial working directory. If we came through a symlink, | |
| 812 * go back through the file descriptor. Otherwise, move up | |
| 813 * one level, via "..". | |
| 5858 | 814 */ |
| 815 if (p->fts_level == FTS_ROOTLEVEL) { | |
| 7151 | 816 if (RESTORE_INITIAL_CWD(sp)) { |
| 5858 | 817 p->fts_errno = errno; |
| 818 SET(FTS_STOP); | |
| 819 } | |
| 820 } else if (p->fts_flags & FTS_SYMFOLLOW) { | |
| 821 if (FCHDIR(sp, p->fts_symfd)) { | |
| 7151 | 822 int saved_errno = errno; |
| 5858 | 823 (void)close(p->fts_symfd); |
| 824 __set_errno (saved_errno); | |
| 825 p->fts_errno = errno; | |
| 826 SET(FTS_STOP); | |
| 827 } | |
| 828 (void)close(p->fts_symfd); | |
| 829 } else if (!(p->fts_flags & FTS_DONTCHDIR) && | |
| 830 fts_safe_changedir(sp, p->fts_parent, -1, "..")) { | |
| 831 p->fts_errno = errno; | |
| 832 SET(FTS_STOP); | |
| 833 } | |
| 834 p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP; | |
| 835 if (p->fts_errno == 0) | |
| 836 LEAVE_DIR (sp, p, "3"); | |
| 837 return ISSET(FTS_STOP) ? NULL : p; | |
| 838 } | |
| 839 | |
| 840 /* | |
| 841 * Fts_set takes the stream as an argument although it's not used in this | |
| 842 * implementation; it would be necessary if anyone wanted to add global | |
| 843 * semantics to fts using fts_set. An error return is allowed for similar | |
| 844 * reasons. | |
| 845 */ | |
| 846 /* ARGSUSED */ | |
| 847 int | |
| 848 fts_set(FTS *sp ATTRIBUTE_UNUSED, FTSENT *p, int instr) | |
| 849 { | |
| 850 if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW && | |
| 851 instr != FTS_NOINSTR && instr != FTS_SKIP) { | |
| 852 __set_errno (EINVAL); | |
| 853 return (1); | |
| 854 } | |
| 855 p->fts_instr = instr; | |
| 856 return (0); | |
| 857 } | |
| 858 | |
| 859 FTSENT * | |
| 860 fts_children (register FTS *sp, int instr) | |
| 861 { | |
| 862 register FTSENT *p; | |
| 863 int fd; | |
| 864 | |
| 865 if (instr != 0 && instr != FTS_NAMEONLY) { | |
| 866 __set_errno (EINVAL); | |
| 867 return (NULL); | |
| 868 } | |
| 869 | |
| 870 /* Set current node pointer. */ | |
| 871 p = sp->fts_cur; | |
| 872 | |
| 873 /* | |
| 874 * Errno set to 0 so user can distinguish empty directory from | |
| 875 * an error. | |
| 876 */ | |
| 877 __set_errno (0); | |
| 878 | |
| 879 /* Fatal errors stop here. */ | |
| 880 if (ISSET(FTS_STOP)) | |
| 881 return (NULL); | |
| 882 | |
| 883 /* Return logical hierarchy of user's arguments. */ | |
| 884 if (p->fts_info == FTS_INIT) | |
| 885 return (p->fts_link); | |
| 886 | |
| 887 /* | |
| 888 * If not a directory being visited in pre-order, stop here. Could | |
| 889 * allow FTS_DNR, assuming the user has fixed the problem, but the | |
| 890 * same effect is available with FTS_AGAIN. | |
| 891 */ | |
| 892 if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */) | |
| 893 return (NULL); | |
| 894 | |
| 895 /* Free up any previous child list. */ | |
| 896 if (sp->fts_child != NULL) | |
| 897 fts_lfree(sp->fts_child); | |
| 898 | |
| 899 if (instr == FTS_NAMEONLY) { | |
| 900 SET(FTS_NAMEONLY); | |
| 901 instr = BNAMES; | |
| 902 } else | |
| 903 instr = BCHILD; | |
| 904 | |
| 905 /* | |
| 5907 | 906 * If using chdir on a relative file name and called BEFORE fts_read |
| 907 * does its chdir to the root of a traversal, we can lose -- we need to | |
| 5858 | 908 * chdir into the subdirectory, and we don't know where the current |
| 909 * directory is, so we can't get back so that the upcoming chdir by | |
| 910 * fts_read will work. | |
| 911 */ | |
| 912 if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' || | |
| 913 ISSET(FTS_NOCHDIR)) | |
| 914 return (sp->fts_child = fts_build(sp, instr)); | |
| 915 | |
| 7151 | 916 if ((fd = diropen (sp, ".")) < 0) |
| 5858 | 917 return (sp->fts_child = NULL); |
| 918 sp->fts_child = fts_build(sp, instr); | |
| 7151 | 919 if (ISSET(FTS_CWDFD)) |
| 920 { | |
|
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921 cwd_advance_fd (sp, fd, true); |
| 7151 | 922 } |
| 923 else | |
| 924 { | |
| 925 if (fchdir(fd)) | |
| 926 { | |
|
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927 int saved_errno = errno; |
| 7151 | 928 close (fd); |
|
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|
929 __set_errno (saved_errno); |
| 7151 | 930 return NULL; |
| 931 } | |
| 932 close (fd); | |
| 933 } | |
| 5858 | 934 return (sp->fts_child); |
| 935 } | |
| 936 | |
|
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937 #if defined HAVE_SYS_VFS_H && HAVE_FSTATFS && HAVE_STRUCT_STATFS_F_TYPE |
|
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938 # include <sys/statfs.h> |
|
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939 /* FIXME: what about when f_type is not an integral type? |
|
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940 deal with that if/when it's encountered. */ |
|
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941 static bool |
|
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942 fs_handles_readdir_ordered_dirents_efficiently (uintmax_t fs_type) |
|
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943 { |
|
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944 /* From coreutils' src/fs.h */ |
|
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945 #define S_MAGIC_TMPFS 0x1021994 |
|
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946 #define S_MAGIC_NFS 0x6969 |
|
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947 switch (fs_type) |
|
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948 { |
|
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949 case S_MAGIC_TMPFS: |
|
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950 case S_MAGIC_NFS: |
|
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951 return true; |
|
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952 default: |
|
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953 return false; |
|
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954 } |
|
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955 } |
|
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956 |
|
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957 /* Return true if it is easy to determine the file system type of the |
|
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958 current directory, and sorting dirents on inode numbers is known to |
|
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959 improve traversal performance with that type of file system. */ |
|
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960 static bool |
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961 dirent_inode_sort_may_be_useful (FTS const *sp) |
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962 { |
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963 struct statfs fs_buf; |
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964 /* Skip the sort only if we can determine efficiently |
|
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965 that it's the right thing to do. */ |
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966 bool skip = (ISSET (FTS_CWDFD) |
|
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967 && fstatfs (sp->fts_cwd_fd, &fs_buf) == 0 |
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968 && fs_handles_readdir_ordered_dirents_efficiently |
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969 (fs_buf.f_type)); |
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970 return !skip; |
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971 } |
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972 #else |
|
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973 static bool dirent_inode_sort_may_be_useful (FTS const *sp) { return true; } |
|
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974 #endif |
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975 |
|
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976 /* A comparison function to sort on increasing inode number. |
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977 For some file system types, sorting either way makes a huge |
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978 performance difference for a directory with very many entries, |
|
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979 but sorting on increasing values is slightly better than sorting |
|
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980 on decreasing values. The difference is in the 5% range. */ |
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981 static int |
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982 fts_compare_ino (struct _ftsent const **a, struct _ftsent const **b) |
|
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|
983 { |
|
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|
984 return (a[0]->fts_statp->st_ino < b[0]->fts_statp->st_ino ? -1 |
|
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985 : b[0]->fts_statp->st_ino < a[0]->fts_statp->st_ino ? 1 : 0); |
|
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986 } |
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987 |
| 5858 | 988 /* |
| 989 * This is the tricky part -- do not casually change *anything* in here. The | |
| 990 * idea is to build the linked list of entries that are used by fts_children | |
| 991 * and fts_read. There are lots of special cases. | |
| 992 * | |
| 993 * The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is | |
| 994 * set and it's a physical walk (so that symbolic links can't be directories), | |
| 995 * we can do things quickly. First, if it's a 4.4BSD file system, the type | |
| 996 * of the file is in the directory entry. Otherwise, we assume that the number | |
| 997 * of subdirectories in a node is equal to the number of links to the parent. | |
| 998 * The former skips all stat calls. The latter skips stat calls in any leaf | |
| 999 * directories and for any files after the subdirectories in the directory have | |
| 1000 * been found, cutting the stat calls by about 2/3. | |
| 1001 */ | |
| 1002 static FTSENT * | |
| 1003 internal_function | |
| 1004 fts_build (register FTS *sp, int type) | |
| 1005 { | |
| 1006 register struct dirent *dp; | |
| 1007 register FTSENT *p, *head; | |
| 1008 register size_t nitems; | |
| 1009 FTSENT *cur, *tail; | |
| 1010 DIR *dirp; | |
| 1011 void *oldaddr; | |
| 1012 int saved_errno; | |
| 1013 bool descend; | |
| 1014 bool doadjust; | |
| 1015 ptrdiff_t level; | |
| 1016 nlink_t nlinks; | |
| 1017 bool nostat; | |
| 1018 size_t len, maxlen, new_len; | |
| 1019 char *cp; | |
| 1020 | |
| 1021 /* Set current node pointer. */ | |
| 1022 cur = sp->fts_cur; | |
| 1023 | |
| 1024 /* | |
| 1025 * Open the directory for reading. If this fails, we're done. | |
| 1026 * If being called from fts_read, set the fts_info field. | |
| 1027 */ | |
| 1028 #if defined FTS_WHITEOUT && 0 | |
| 1029 if (ISSET(FTS_WHITEOUT)) | |
| 1030 oflag = DTF_NODUP|DTF_REWIND; | |
| 1031 else | |
| 1032 oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND; | |
| 1033 #else | |
| 7151 | 1034 # define __opendir2(file, flag) \ |
| 1035 ( ! ISSET(FTS_NOCHDIR) && ISSET(FTS_CWDFD) \ | |
| 1036 ? opendirat(sp->fts_cwd_fd, file) \ | |
| 1037 : opendir(file)) | |
| 5858 | 1038 #endif |
| 1039 if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) { | |
| 1040 if (type == BREAD) { | |
| 1041 cur->fts_info = FTS_DNR; | |
| 1042 cur->fts_errno = errno; | |
| 1043 } | |
| 1044 return (NULL); | |
| 1045 } | |
|
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|
1046 /* Rather than calling fts_stat for each and every entry encountered |
|
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|
1047 in the readdir loop (below), stat each directory only right after |
|
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|
1048 opening it. */ |
|
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|
1049 if (cur->fts_info == FTS_NSOK) |
|
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|
1050 cur->fts_info = fts_stat(sp, cur, false); |
| 5858 | 1051 |
| 1052 /* | |
| 1053 * Nlinks is the number of possible entries of type directory in the | |
| 1054 * directory if we're cheating on stat calls, 0 if we're not doing | |
| 1055 * any stat calls at all, (nlink_t) -1 if we're statting everything. | |
| 1056 */ | |
| 1057 if (type == BNAMES) { | |
| 1058 nlinks = 0; | |
| 1059 /* Be quiet about nostat, GCC. */ | |
| 1060 nostat = false; | |
| 1061 } else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) { | |
| 1062 nlinks = (cur->fts_statp->st_nlink | |
| 1063 - (ISSET(FTS_SEEDOT) ? 0 : 2)); | |
| 1064 nostat = true; | |
| 1065 } else { | |
| 1066 nlinks = -1; | |
| 1067 nostat = false; | |
| 1068 } | |
| 1069 | |
| 1070 /* | |
| 1071 * If we're going to need to stat anything or we want to descend | |
| 1072 * and stay in the directory, chdir. If this fails we keep going, | |
| 1073 * but set a flag so we don't chdir after the post-order visit. | |
| 1074 * We won't be able to stat anything, but we can still return the | |
| 1075 * names themselves. Note, that since fts_read won't be able to | |
| 5907 | 1076 * chdir into the directory, it will have to return different file |
| 5858 | 1077 * names than before, i.e. "a/b" instead of "b". Since the node |
| 1078 * has already been visited in pre-order, have to wait until the | |
| 1079 * post-order visit to return the error. There is a special case | |
| 1080 * here, if there was nothing to stat then it's not an error to | |
| 1081 * not be able to stat. This is all fairly nasty. If a program | |
| 1082 * needed sorted entries or stat information, they had better be | |
| 1083 * checking FTS_NS on the returned nodes. | |
| 1084 */ | |
| 1085 if (nlinks || type == BREAD) { | |
| 7151 | 1086 int dir_fd = dirfd(dirp); |
| 1087 if (ISSET(FTS_CWDFD) && 0 <= dir_fd) | |
| 1088 dir_fd = dup (dir_fd); | |
| 1089 if (dir_fd < 0 || fts_safe_changedir(sp, cur, dir_fd, NULL)) { | |
| 5858 | 1090 if (nlinks && type == BREAD) |
| 1091 cur->fts_errno = errno; | |
| 1092 cur->fts_flags |= FTS_DONTCHDIR; | |
| 1093 descend = false; | |
|
5867
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diff
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|
1094 closedir(dirp); |
| 7151 | 1095 if (ISSET(FTS_CWDFD) && 0 <= dir_fd) |
| 1096 close (dir_fd); | |
| 5858 | 1097 dirp = NULL; |
| 1098 } else | |
| 1099 descend = true; | |
| 1100 } else | |
| 1101 descend = false; | |
| 1102 | |
| 1103 /* | |
| 1104 * Figure out the max file name length that can be stored in the | |
| 5907 | 1105 * current buffer -- the inner loop allocates more space as necessary. |
| 5858 | 1106 * We really wouldn't have to do the maxlen calculations here, we |
| 5907 | 1107 * could do them in fts_read before returning the name, but it's a |
| 5858 | 1108 * lot easier here since the length is part of the dirent structure. |
| 1109 * | |
| 1110 * If not changing directories set a pointer so that can just append | |
| 5907 | 1111 * each new component into the file name. |
| 5858 | 1112 */ |
| 1113 len = NAPPEND(cur); | |
| 1114 if (ISSET(FTS_NOCHDIR)) { | |
| 1115 cp = sp->fts_path + len; | |
| 1116 *cp++ = '/'; | |
| 1117 } else { | |
| 1118 /* GCC, you're too verbose. */ | |
| 1119 cp = NULL; | |
| 1120 } | |
| 1121 len++; | |
| 1122 maxlen = sp->fts_pathlen - len; | |
| 1123 | |
| 1124 level = cur->fts_level + 1; | |
| 1125 | |
| 1126 /* Read the directory, attaching each entry to the `link' pointer. */ | |
| 1127 doadjust = false; | |
| 1128 for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp));) { | |
|
7555
0da62e3fa6c7
(fts_build): Move variable declaration, for C89 compliance.
Bruno Haible <bruno@clisp.org>
parents:
7499
diff
changeset
|
1129 bool is_dir; |
|
0da62e3fa6c7
(fts_build): Move variable declaration, for C89 compliance.
Bruno Haible <bruno@clisp.org>
parents:
7499
diff
changeset
|
1130 |
| 5858 | 1131 if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name)) |
| 1132 continue; | |
| 1133 | |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1134 if ((p = fts_alloc (sp, dp->d_name, |
|
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1135 _D_EXACT_NAMLEN (dp))) == NULL) |
| 5858 | 1136 goto mem1; |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1137 if (_D_EXACT_NAMLEN (dp) >= maxlen) { |
|
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1138 /* include space for NUL */ |
| 5858 | 1139 oldaddr = sp->fts_path; |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1140 if (! fts_palloc(sp, _D_EXACT_NAMLEN (dp) + len + 1)) { |
| 5858 | 1141 /* |
| 5907 | 1142 * No more memory. Save |
| 5858 | 1143 * errno, free up the current structure and the |
| 1144 * structures already allocated. | |
| 1145 */ | |
| 1146 mem1: saved_errno = errno; | |
|
7396
6f79ccad009d
2006-10-02 Dmitry V. Levin <ldv@altlinux.org>
Jim Meyering <jim@meyering.net>
parents:
7302
diff
changeset
|
1147 free(p); |
| 5858 | 1148 fts_lfree(head); |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1149 closedir(dirp); |
| 5858 | 1150 cur->fts_info = FTS_ERR; |
| 1151 SET(FTS_STOP); | |
| 1152 __set_errno (saved_errno); | |
| 1153 return (NULL); | |
| 1154 } | |
| 1155 /* Did realloc() change the pointer? */ | |
| 1156 if (oldaddr != sp->fts_path) { | |
| 1157 doadjust = true; | |
| 1158 if (ISSET(FTS_NOCHDIR)) | |
| 1159 cp = sp->fts_path + len; | |
| 1160 } | |
| 1161 maxlen = sp->fts_pathlen - len; | |
| 1162 } | |
| 1163 | |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
1164 new_len = len + _D_EXACT_NAMLEN (dp); |
| 5858 | 1165 if (new_len < len) { |
| 1166 /* | |
|
9718
5954dae30c7f
* lib/fts.c (fts_build): Typo correction to comment.
Martin Buchholz <martin@xemacs.org>
parents:
9613
diff
changeset
|
1167 * In the unlikely event that we would end up |
| 5907 | 1168 * with a file name longer than SIZE_MAX, free up |
| 5858 | 1169 * the current structure and the structures already |
| 1170 * allocated, then error out with ENAMETOOLONG. | |
| 1171 */ | |
| 1172 free(p); | |
| 1173 fts_lfree(head); | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1174 closedir(dirp); |
| 5858 | 1175 cur->fts_info = FTS_ERR; |
| 1176 SET(FTS_STOP); | |
| 1177 __set_errno (ENAMETOOLONG); | |
| 1178 return (NULL); | |
| 1179 } | |
| 1180 p->fts_level = level; | |
| 1181 p->fts_parent = sp->fts_cur; | |
| 1182 p->fts_pathlen = new_len; | |
| 1183 | |
| 1184 #if defined FTS_WHITEOUT && 0 | |
| 1185 if (dp->d_type == DT_WHT) | |
| 1186 p->fts_flags |= FTS_ISW; | |
| 1187 #endif | |
|
10481
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1188 /* Store dirent.d_ino, in case we need to sort |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1189 entries before processing them. */ |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1190 p->fts_statp->st_ino = D_INO (dp); |
| 5858 | 1191 |
| 7151 | 1192 /* Build a file name for fts_stat to stat. */ |
| 1193 if (ISSET(FTS_NOCHDIR)) { | |
| 1194 p->fts_accpath = p->fts_path; | |
| 1195 memmove(cp, p->fts_name, p->fts_namelen + 1); | |
| 1196 } else | |
| 1197 p->fts_accpath = p->fts_name; | |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1198 |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1199 if (sp->fts_compar == NULL || ISSET(FTS_DEFER_STAT)) { |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1200 /* Record what fts_read will have to do with this |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1201 entry. In many cases, it will simply fts_stat it, |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1202 but we can take advantage of any d_type information |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1203 to optimize away the unnecessary stat calls. I.e., |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1204 if FTS_NOSTAT is in effect and we're not following |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1205 symlinks (FTS_PHYSICAL) and d_type indicates this |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1206 is *not* a directory, then we won't have to stat it |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1207 at all. If it *is* a directory, then (currently) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1208 we stat it regardless, in order to get device and |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1209 inode numbers. Some day we might optimize that |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1210 away, too, for directories where d_ino is known to |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1211 be valid. */ |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1212 bool skip_stat = (ISSET(FTS_PHYSICAL) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1213 && ISSET(FTS_NOSTAT) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1214 && DT_IS_KNOWN(dp) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1215 && ! DT_MUST_BE(dp, DT_DIR)); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1216 p->fts_info = FTS_NSOK; |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1217 fts_set_stat_required(p, !skip_stat); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1218 is_dir = (ISSET(FTS_PHYSICAL) && ISSET(FTS_NOSTAT) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1219 && DT_MUST_BE(dp, DT_DIR)); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1220 } else { |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1221 p->fts_info = fts_stat(sp, p, false); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1222 is_dir = (p->fts_info == FTS_D |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1223 || p->fts_info == FTS_DC |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1224 || p->fts_info == FTS_DOT); |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1225 } |
| 5858 | 1226 |
| 7151 | 1227 /* Decrement link count if applicable. */ |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
Jim Meyering <jim@meyering.net>
parents:
7408
diff
changeset
|
1228 if (nlinks > 0 && is_dir) |
| 7151 | 1229 nlinks -= nostat; |
| 5858 | 1230 |
| 1231 /* We walk in directory order so "ls -f" doesn't get upset. */ | |
| 1232 p->fts_link = NULL; | |
| 1233 if (head == NULL) | |
| 1234 head = tail = p; | |
| 1235 else { | |
| 1236 tail->fts_link = p; | |
| 1237 tail = p; | |
| 1238 } | |
| 1239 ++nitems; | |
| 1240 } | |
| 1241 if (dirp) | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1242 closedir(dirp); |
| 5858 | 1243 |
| 1244 /* | |
| 5907 | 1245 * If realloc() changed the address of the file name, adjust the |
| 5858 | 1246 * addresses for the rest of the tree and the dir list. |
| 1247 */ | |
| 1248 if (doadjust) | |
| 1249 fts_padjust(sp, head); | |
| 1250 | |
| 1251 /* | |
| 5907 | 1252 * If not changing directories, reset the file name back to original |
| 5858 | 1253 * state. |
| 1254 */ | |
| 1255 if (ISSET(FTS_NOCHDIR)) { | |
| 1256 if (len == sp->fts_pathlen || nitems == 0) | |
| 1257 --cp; | |
| 1258 *cp = '\0'; | |
| 1259 } | |
| 1260 | |
| 1261 /* | |
| 1262 * If descended after called from fts_children or after called from | |
| 1263 * fts_read and nothing found, get back. At the root level we use | |
| 5907 | 1264 * the saved fd; if one of fts_open()'s arguments is a relative name |
| 5858 | 1265 * to an empty directory, we wind up here with no other way back. If |
| 1266 * can't get back, we're done. | |
| 1267 */ | |
| 1268 if (descend && (type == BCHILD || !nitems) && | |
| 7151 | 1269 (cur->fts_level == FTS_ROOTLEVEL |
| 1270 ? RESTORE_INITIAL_CWD(sp) | |
| 1271 : fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) { | |
| 5858 | 1272 cur->fts_info = FTS_ERR; |
| 1273 SET(FTS_STOP); | |
| 7151 | 1274 fts_lfree(head); |
| 5858 | 1275 return (NULL); |
| 1276 } | |
| 1277 | |
| 1278 /* If didn't find anything, return NULL. */ | |
| 1279 if (!nitems) { | |
| 1280 if (type == BREAD) | |
| 1281 cur->fts_info = FTS_DP; | |
| 7151 | 1282 fts_lfree(head); |
| 5858 | 1283 return (NULL); |
| 1284 } | |
| 1285 | |
|
10481
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1286 /* If there are many entries, no sorting function has been specified, |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1287 and this file system is of a type that may be slow with a large |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1288 number of entries, then sort the directory entries on increasing |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1289 inode numbers. */ |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1290 if (nitems > _FTS_INODE_SORT_DIR_ENTRIES_THRESHOLD |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1291 && !sp->fts_compar |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1292 && dirent_inode_sort_may_be_useful (sp)) { |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1293 sp->fts_compar = fts_compare_ino; |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1294 head = fts_sort (sp, head, nitems); |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1295 sp->fts_compar = NULL; |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1296 } |
|
47fe4e48e158
fts: sort dirent entries on inode number before traversing
Jim Meyering <meyering@redhat.com>
parents:
9718
diff
changeset
|
1297 |
| 5858 | 1298 /* Sort the entries. */ |
| 1299 if (sp->fts_compar && nitems > 1) | |
| 1300 head = fts_sort(sp, head, nitems); | |
| 1301 return (head); | |
| 1302 } | |
| 1303 | |
| 1304 #if FTS_DEBUG | |
| 1305 | |
| 1306 /* Walk ->fts_parent links starting at E_CURR, until the root of the | |
| 1307 current hierarchy. There should be a directory with dev/inode | |
| 1308 matching those of AD. If not, print a lot of diagnostics. */ | |
| 1309 static void | |
| 1310 find_matching_ancestor (FTSENT const *e_curr, struct Active_dir const *ad) | |
| 1311 { | |
| 1312 FTSENT const *ent; | |
| 1313 for (ent = e_curr; ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
| 1314 { | |
| 1315 if (ad->ino == ent->fts_statp->st_ino | |
| 1316 && ad->dev == ent->fts_statp->st_dev) | |
| 1317 return; | |
| 1318 } | |
| 1319 printf ("ERROR: tree dir, %s, not active\n", ad->fts_ent->fts_accpath); | |
| 1320 printf ("active dirs:\n"); | |
| 1321 for (ent = e_curr; | |
| 1322 ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
| 1323 printf (" %s(%"PRIuMAX"/%"PRIuMAX") to %s(%"PRIuMAX"/%"PRIuMAX")...\n", | |
| 1324 ad->fts_ent->fts_accpath, | |
| 1325 (uintmax_t) ad->dev, | |
| 1326 (uintmax_t) ad->ino, | |
| 1327 ent->fts_accpath, | |
| 1328 (uintmax_t) ent->fts_statp->st_dev, | |
| 1329 (uintmax_t) ent->fts_statp->st_ino); | |
| 1330 } | |
| 1331 | |
| 1332 void | |
| 1333 fts_cross_check (FTS const *sp) | |
| 1334 { | |
| 1335 FTSENT const *ent = sp->fts_cur; | |
| 1336 FTSENT const *t; | |
| 1337 if ( ! ISSET (FTS_TIGHT_CYCLE_CHECK)) | |
| 1338 return; | |
| 1339 | |
| 1340 Dprintf (("fts-cross-check cur=%s\n", ent->fts_path)); | |
| 1341 /* Make sure every parent dir is in the tree. */ | |
| 1342 for (t = ent->fts_parent; t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
| 1343 { | |
| 1344 struct Active_dir ad; | |
| 1345 ad.ino = t->fts_statp->st_ino; | |
| 1346 ad.dev = t->fts_statp->st_dev; | |
|
6034
96149b1bbb32
(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
Jim Meyering <jim@meyering.net>
parents:
5907
diff
changeset
|
1347 if ( ! hash_lookup (sp->fts_cycle.ht, &ad)) |
| 5858 | 1348 printf ("ERROR: active dir, %s, not in tree\n", t->fts_path); |
| 1349 } | |
| 1350 | |
| 1351 /* Make sure every dir in the tree is an active dir. | |
| 1352 But ENT is not necessarily a directory. If so, just skip this part. */ | |
| 1353 if (ent->fts_parent->fts_level >= FTS_ROOTLEVEL | |
| 1354 && (ent->fts_info == FTS_DP | |
| 1355 || ent->fts_info == FTS_D)) | |
| 1356 { | |
| 1357 struct Active_dir *ad; | |
|
6034
96149b1bbb32
(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
Jim Meyering <jim@meyering.net>
parents:
5907
diff
changeset
|
1358 for (ad = hash_get_first (sp->fts_cycle.ht); ad != NULL; |
|
96149b1bbb32
(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
Jim Meyering <jim@meyering.net>
parents:
5907
diff
changeset
|
1359 ad = hash_get_next (sp->fts_cycle.ht, ad)) |
| 5858 | 1360 { |
| 1361 find_matching_ancestor (ent, ad); | |
| 1362 } | |
| 1363 } | |
| 1364 } | |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1365 |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1366 static bool |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1367 same_fd (int fd1, int fd2) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1368 { |
|
1670d42131d7
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|
1369 struct stat sb1, sb2; |
|
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|
1370 return (fstat (fd1, &sb1) == 0 |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1371 && fstat (fd2, &sb2) == 0 |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1372 && SAME_INODE (sb1, sb2)); |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1373 } |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1374 |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1375 static void |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
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|
1376 fd_ring_print (FTS const *sp, FILE *stream, char const *msg) |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1377 { |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
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|
1378 I_ring const *fd_ring = &sp->fts_fd_ring; |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1379 unsigned int i = fd_ring->fts_front; |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1380 char *cwd = getcwdat (sp->fts_cwd_fd, NULL, 0); |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1381 fprintf (stream, "=== %s ========== %s\n", msg, cwd); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1382 free (cwd); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1383 if (i_ring_empty (fd_ring)) |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1384 return; |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1385 |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1386 while (true) |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
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|
1387 { |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1388 int fd = fd_ring->fts_fd_ring[i]; |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1389 if (fd < 0) |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
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|
1390 fprintf (stream, "%d: %d:\n", i, fd); |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1391 else |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1392 { |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1393 char *wd = getcwdat (fd, NULL, 0); |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1394 fprintf (stream, "%d: %d: %s\n", i, fd, wd); |
|
1670d42131d7
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Jim Meyering <jim@meyering.net>
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|
1395 free (wd); |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
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|
1396 } |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1397 if (i == fd_ring->fts_back) |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1398 break; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
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|
1399 i = (i + I_RING_SIZE - 1) % I_RING_SIZE; |
|
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Jim Meyering <jim@meyering.net>
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|
1400 } |
|
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Jim Meyering <jim@meyering.net>
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|
1401 } |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1402 |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1403 /* Ensure that each file descriptor on the fd_ring matches a |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1404 parent, grandparent, etc. of the current working directory. */ |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1405 static void |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1406 fd_ring_check (FTS const *sp) |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1407 { |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1408 if (!fts_debug) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1409 return; |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1410 |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1411 /* Make a writable copy. */ |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1412 I_ring fd_w = sp->fts_fd_ring; |
|
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1413 |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1414 int cwd_fd = sp->fts_cwd_fd; |
|
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|
1415 cwd_fd = dup (cwd_fd); |
|
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1416 char *dot = getcwdat (cwd_fd, NULL, 0); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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diff
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|
1417 error (0, 0, "===== check ===== cwd: %s", dot); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
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1418 free (dot); |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1419 while ( ! i_ring_empty (&fd_w)) |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1420 { |
|
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1421 int fd = i_ring_pop (&fd_w); |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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1422 if (0 <= fd) |
|
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1423 { |
|
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1424 int parent_fd = openat (cwd_fd, "..", O_RDONLY); |
|
1670d42131d7
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|
1425 if (parent_fd < 0) |
|
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1426 { |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1427 // Warn? |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1428 break; |
|
1670d42131d7
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|
1429 } |
|
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|
1430 if (!same_fd (fd, parent_fd)) |
|
1670d42131d7
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|
1431 { |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1432 char *cwd = getcwdat (fd, NULL, 0); |
|
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|
1433 error (0, errno, "ring : %s", cwd); |
|
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|
1434 char *c2 = getcwdat (parent_fd, NULL, 0); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1435 error (0, errno, "parent: %s", c2); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1436 free (cwd); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1437 free (c2); |
|
7785
3246679850d5
Slight readability improvement: use an assert-like macro
Jim Meyering <jim@meyering.net>
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7707
diff
changeset
|
1438 fts_assert (0); |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1439 } |
|
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Make fts (in FTS_CWDFD mode) more efficient by caching a few open
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|
1440 close (cwd_fd); |
|
1670d42131d7
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changeset
|
1441 cwd_fd = parent_fd; |
|
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|
1442 } |
|
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|
1443 } |
|
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|
1444 close (cwd_fd); |
|
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|
1445 } |
| 5858 | 1446 #endif |
| 1447 | |
| 1448 static unsigned short int | |
| 1449 internal_function | |
| 1450 fts_stat(FTS *sp, register FTSENT *p, bool follow) | |
| 1451 { | |
| 1452 struct stat *sbp = p->fts_statp; | |
| 1453 int saved_errno; | |
| 1454 | |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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diff
changeset
|
1455 if (p->fts_level == FTS_ROOTLEVEL && ISSET(FTS_COMFOLLOW)) |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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diff
changeset
|
1456 follow = true; |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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diff
changeset
|
1457 |
| 5858 | 1458 #if defined FTS_WHITEOUT && 0 |
| 1459 /* check for whiteout */ | |
| 1460 if (p->fts_flags & FTS_ISW) { | |
| 1461 memset(sbp, '\0', sizeof (*sbp)); | |
| 1462 sbp->st_mode = S_IFWHT; | |
| 1463 return (FTS_W); | |
| 1464 } | |
| 1465 #endif | |
| 1466 | |
| 1467 /* | |
| 1468 * If doing a logical walk, or application requested FTS_FOLLOW, do | |
| 1469 * a stat(2). If that fails, check for a non-existent symlink. If | |
| 1470 * fail, set the errno from the stat call. | |
| 1471 */ | |
| 1472 if (ISSET(FTS_LOGICAL) || follow) { | |
| 1473 if (stat(p->fts_accpath, sbp)) { | |
| 1474 saved_errno = errno; | |
|
6611
e4456c51dde7
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diff
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|
1475 if (errno == ENOENT |
|
e4456c51dde7
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diff
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|
1476 && lstat(p->fts_accpath, sbp) == 0) { |
| 5858 | 1477 __set_errno (0); |
| 1478 return (FTS_SLNONE); | |
| 1479 } | |
| 1480 p->fts_errno = saved_errno; | |
| 1481 goto err; | |
| 1482 } | |
| 7151 | 1483 } else if (fstatat(sp->fts_cwd_fd, p->fts_accpath, sbp, |
| 1484 AT_SYMLINK_NOFOLLOW)) { | |
| 5858 | 1485 p->fts_errno = errno; |
| 1486 err: memset(sbp, 0, sizeof(struct stat)); | |
| 1487 return (FTS_NS); | |
| 1488 } | |
| 1489 | |
| 1490 if (S_ISDIR(sbp->st_mode)) { | |
|
7482
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
1491 if (ISDOT(p->fts_name)) { |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
1492 /* Command-line "." and ".." are real directories. */ |
|
26914593f079
Big performance improvement for fts-based tools that use FTS_NOSTAT.
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7408
diff
changeset
|
1493 return (p->fts_level == FTS_ROOTLEVEL ? FTS_D : FTS_DOT); |
|
26914593f079
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7408
diff
changeset
|
1494 } |
| 5872 | 1495 |
|
7797
10432bdf90d3
2007-01-08 Bruno Haible <bruno@clisp.org>
Bruno Haible <bruno@clisp.org>
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7786
diff
changeset
|
1496 #if !GNULIB_FTS |
| 5872 | 1497 { |
| 1498 /* | |
| 1499 * Cycle detection is done by brute force when the directory | |
| 1500 * is first encountered. If the tree gets deep enough or the | |
| 1501 * number of symbolic links to directories is high enough, | |
| 1502 * something faster might be worthwhile. | |
| 1503 */ | |
| 1504 FTSENT *t; | |
| 1505 | |
| 1506 for (t = p->fts_parent; | |
| 1507 t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
| 1508 if (sbp->st_ino == t->fts_statp->st_ino | |
| 1509 && sbp->st_dev == t->fts_statp->st_dev) | |
| 1510 { | |
| 1511 p->fts_cycle = t; | |
| 1512 return (FTS_DC); | |
| 1513 } | |
| 1514 } | |
| 1515 #endif | |
| 1516 | |
| 5858 | 1517 return (FTS_D); |
| 1518 } | |
| 1519 if (S_ISLNK(sbp->st_mode)) | |
| 1520 return (FTS_SL); | |
| 1521 if (S_ISREG(sbp->st_mode)) | |
| 1522 return (FTS_F); | |
| 1523 return (FTS_DEFAULT); | |
| 1524 } | |
| 1525 | |
| 1526 static int | |
| 1527 fts_compar (void const *a, void const *b) | |
| 1528 { | |
| 1529 /* Convert A and B to the correct types, to pacify the compiler, and | |
| 1530 for portability to bizarre hosts where "void const *" and "FTSENT | |
| 1531 const **" differ in runtime representation. The comparison | |
| 1532 function cannot modify *a and *b, but there is no compile-time | |
| 1533 check for this. */ | |
| 1534 FTSENT const **pa = (FTSENT const **) a; | |
| 1535 FTSENT const **pb = (FTSENT const **) b; | |
| 1536 return pa[0]->fts_fts->fts_compar (pa, pb); | |
| 1537 } | |
| 1538 | |
| 1539 static FTSENT * | |
| 1540 internal_function | |
| 1541 fts_sort (FTS *sp, FTSENT *head, register size_t nitems) | |
| 1542 { | |
| 1543 register FTSENT **ap, *p; | |
| 1544 | |
| 1545 /* On most modern hosts, void * and FTSENT ** have the same | |
| 1546 run-time representation, and one can convert sp->fts_compar to | |
| 1547 the type qsort expects without problem. Use the heuristic that | |
| 1548 this is OK if the two pointer types are the same size, and if | |
| 1549 converting FTSENT ** to long int is the same as converting | |
| 1550 FTSENT ** to void * and then to long int. This heuristic isn't | |
| 1551 valid in general but we don't know of any counterexamples. */ | |
| 1552 FTSENT *dummy; | |
| 1553 int (*compare) (void const *, void const *) = | |
| 1554 ((sizeof &dummy == sizeof (void *) | |
| 1555 && (long int) &dummy == (long int) (void *) &dummy) | |
| 1556 ? (int (*) (void const *, void const *)) sp->fts_compar | |
| 1557 : fts_compar); | |
| 1558 | |
| 1559 /* | |
| 1560 * Construct an array of pointers to the structures and call qsort(3). | |
| 1561 * Reassemble the array in the order returned by qsort. If unable to | |
| 1562 * sort for memory reasons, return the directory entries in their | |
| 1563 * current order. Allocate enough space for the current needs plus | |
| 1564 * 40 so don't realloc one entry at a time. | |
| 1565 */ | |
| 1566 if (nitems > sp->fts_nitems) { | |
|
9562
1850c982220c
Avoid use of private FTS type name.
Jim Meyering <jim@meyering.net>
parents:
9309
diff
changeset
|
1567 FTSENT **a; |
| 5858 | 1568 |
| 1569 sp->fts_nitems = nitems + 40; | |
| 1570 if (SIZE_MAX / sizeof *a < sp->fts_nitems | |
| 1571 || ! (a = realloc (sp->fts_array, | |
| 1572 sp->fts_nitems * sizeof *a))) { | |
| 1573 free(sp->fts_array); | |
| 1574 sp->fts_array = NULL; | |
| 1575 sp->fts_nitems = 0; | |
| 1576 return (head); | |
| 1577 } | |
| 1578 sp->fts_array = a; | |
| 1579 } | |
| 1580 for (ap = sp->fts_array, p = head; p; p = p->fts_link) | |
| 1581 *ap++ = p; | |
| 1582 qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *), compare); | |
| 1583 for (head = *(ap = sp->fts_array); --nitems; ++ap) | |
| 1584 ap[0]->fts_link = ap[1]; | |
| 1585 ap[0]->fts_link = NULL; | |
| 1586 return (head); | |
| 1587 } | |
| 1588 | |
| 1589 static FTSENT * | |
| 1590 internal_function | |
| 1591 fts_alloc (FTS *sp, const char *name, register size_t namelen) | |
| 1592 { | |
| 1593 register FTSENT *p; | |
| 1594 size_t len; | |
| 1595 | |
| 1596 /* | |
| 1597 * The file name is a variable length array. Allocate the FTSENT | |
| 1598 * structure and the file name in one chunk. | |
| 1599 */ | |
| 1600 len = sizeof(FTSENT) + namelen; | |
| 1601 if ((p = malloc(len)) == NULL) | |
| 1602 return (NULL); | |
| 1603 | |
| 1604 /* Copy the name and guarantee NUL termination. */ | |
| 1605 memmove(p->fts_name, name, namelen); | |
| 1606 p->fts_name[namelen] = '\0'; | |
| 1607 | |
| 1608 p->fts_namelen = namelen; | |
| 1609 p->fts_fts = sp; | |
| 1610 p->fts_path = sp->fts_path; | |
| 1611 p->fts_errno = 0; | |
| 1612 p->fts_flags = 0; | |
| 1613 p->fts_instr = FTS_NOINSTR; | |
| 1614 p->fts_number = 0; | |
| 1615 p->fts_pointer = NULL; | |
| 1616 return (p); | |
| 1617 } | |
| 1618 | |
| 1619 static void | |
| 1620 internal_function | |
| 1621 fts_lfree (register FTSENT *head) | |
| 1622 { | |
| 1623 register FTSENT *p; | |
| 1624 | |
| 1625 /* Free a linked list of structures. */ | |
| 1626 while ((p = head)) { | |
| 1627 head = head->fts_link; | |
| 1628 free(p); | |
| 1629 } | |
| 1630 } | |
| 1631 | |
| 1632 /* | |
| 5907 | 1633 * Allow essentially unlimited file name lengths; find, rm, ls should |
| 1634 * all work on any tree. Most systems will allow creation of file | |
| 1635 * names much longer than MAXPATHLEN, even though the kernel won't | |
| 1636 * resolve them. Add the size (not just what's needed) plus 256 bytes | |
| 1637 * so don't realloc the file name 2 bytes at a time. | |
| 5858 | 1638 */ |
| 1639 static bool | |
| 1640 internal_function | |
| 1641 fts_palloc (FTS *sp, size_t more) | |
| 1642 { | |
| 1643 char *p; | |
| 1644 size_t new_len = sp->fts_pathlen + more + 256; | |
| 1645 | |
| 1646 /* | |
| 1647 * See if fts_pathlen would overflow. | |
| 1648 */ | |
| 1649 if (new_len < sp->fts_pathlen) { | |
|
7396
6f79ccad009d
2006-10-02 Dmitry V. Levin <ldv@altlinux.org>
Jim Meyering <jim@meyering.net>
parents:
7302
diff
changeset
|
1650 free(sp->fts_path); |
| 5858 | 1651 sp->fts_path = NULL; |
| 1652 __set_errno (ENAMETOOLONG); | |
| 1653 return false; | |
| 1654 } | |
| 1655 sp->fts_pathlen = new_len; | |
| 1656 p = realloc(sp->fts_path, sp->fts_pathlen); | |
| 1657 if (p == NULL) { | |
| 1658 free(sp->fts_path); | |
| 1659 sp->fts_path = NULL; | |
| 1660 return false; | |
| 1661 } | |
| 1662 sp->fts_path = p; | |
| 1663 return true; | |
| 1664 } | |
| 1665 | |
| 1666 /* | |
| 5907 | 1667 * When the file name is realloc'd, have to fix all of the pointers in |
| 1668 * structures already returned. | |
| 5858 | 1669 */ |
| 1670 static void | |
| 1671 internal_function | |
| 1672 fts_padjust (FTS *sp, FTSENT *head) | |
| 1673 { | |
| 1674 FTSENT *p; | |
| 1675 char *addr = sp->fts_path; | |
| 1676 | |
| 1677 #define ADJUST(p) do { \ | |
| 1678 if ((p)->fts_accpath != (p)->fts_name) { \ | |
| 1679 (p)->fts_accpath = \ | |
| 1680 (char *)addr + ((p)->fts_accpath - (p)->fts_path); \ | |
| 1681 } \ | |
| 1682 (p)->fts_path = addr; \ | |
| 1683 } while (0) | |
| 1684 /* Adjust the current set of children. */ | |
| 1685 for (p = sp->fts_child; p; p = p->fts_link) | |
| 1686 ADJUST(p); | |
| 1687 | |
| 1688 /* Adjust the rest of the tree, including the current level. */ | |
| 1689 for (p = head; p->fts_level >= FTS_ROOTLEVEL;) { | |
| 1690 ADJUST(p); | |
| 1691 p = p->fts_link ? p->fts_link : p->fts_parent; | |
| 1692 } | |
| 1693 } | |
| 1694 | |
| 1695 static size_t | |
| 1696 internal_function | |
| 1697 fts_maxarglen (char * const *argv) | |
| 1698 { | |
| 1699 size_t len, max; | |
| 1700 | |
| 1701 for (max = 0; *argv; ++argv) | |
| 1702 if ((len = strlen(*argv)) > max) | |
| 1703 max = len; | |
| 1704 return (max + 1); | |
| 1705 } | |
| 1706 | |
| 1707 /* | |
| 5907 | 1708 * Change to dir specified by fd or file name without getting |
| 5858 | 1709 * tricked by someone changing the world out from underneath us. |
| 1710 * Assumes p->fts_statp->st_dev and p->fts_statp->st_ino are filled in. | |
| 7151 | 1711 * If FD is non-negative, expect it to be used after this function returns, |
| 1712 * and to be closed eventually. So don't pass e.g., `dirfd(dirp)' and then | |
| 1713 * do closedir(dirp), because that would invalidate the saved FD. | |
| 1714 * Upon failure, close FD immediately and return nonzero. | |
| 5858 | 1715 */ |
| 1716 static int | |
| 1717 internal_function | |
| 5907 | 1718 fts_safe_changedir (FTS *sp, FTSENT *p, int fd, char const *dir) |
| 5858 | 1719 { |
| 7151 | 1720 int ret; |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1721 bool is_dotdot = dir && STREQ (dir, ".."); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1722 int newfd; |
|
7623
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1723 |
|
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1724 /* This clause handles the unusual case in which FTS_NOCHDIR |
|
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1725 is specified, along with FTS_CWDFD. In that case, there is |
|
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1726 no need to change even the virtual cwd file descriptor. |
|
5bfad7d666d6
* lib/fts.c (fts_safe_changedir): Add a comment.
Jim Meyering <jim@meyering.net>
parents:
7621
diff
changeset
|
1727 However, if FD is non-negative, we do close it here. */ |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1728 if (ISSET (FTS_NOCHDIR)) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1729 { |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1730 if (ISSET (FTS_CWDFD) && 0 <= fd) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1731 close (fd); |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1732 return 0; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1733 } |
| 5858 | 1734 |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1735 if (fd < 0 && is_dotdot && ISSET (FTS_CWDFD)) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1736 { |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1737 /* When possible, skip the diropen and subsequent fstat+dev/ino |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1738 comparison. I.e., when changing to parent directory |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1739 (chdir ("..")), use a file descriptor from the ring and |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1740 save the overhead of diropen+fstat, as well as avoiding |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1741 failure when we lack "x" access to the virtual cwd. */ |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1742 if ( ! i_ring_empty (&sp->fts_fd_ring)) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1743 { |
|
7681
a6b7b31e9ddf
* lib/fts.c (fts_safe_changedir): Move a declaration "up",
Jim Meyering <jim@meyering.net>
parents:
7639
diff
changeset
|
1744 int parent_fd; |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1745 fd_ring_print (sp, stderr, "pre-pop"); |
|
7681
a6b7b31e9ddf
* lib/fts.c (fts_safe_changedir): Move a declaration "up",
Jim Meyering <jim@meyering.net>
parents:
7639
diff
changeset
|
1746 parent_fd = i_ring_pop (&sp->fts_fd_ring); |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1747 is_dotdot = true; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1748 if (0 <= parent_fd) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1749 { |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1750 fd = parent_fd; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1751 dir = NULL; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1752 } |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1753 } |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1754 } |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1755 |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1756 newfd = fd; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1757 if (fd < 0 && (newfd = diropen (sp, dir)) < 0) |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1758 return -1; |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1759 |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1760 /* The following dev/inode check is necessary if we're doing a |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1761 `logical' traversal (through symlinks, a la chown -L), if the |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1762 system lacks O_NOFOLLOW support, or if we're changing to ".." |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1763 (but not via a popped file descriptor). When changing to the |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1764 name "..", O_NOFOLLOW can't help. In general, when the target is |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1765 not "..", diropen's use of O_NOFOLLOW ensures we don't mistakenly |
|
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1766 follow a symlink, so we can avoid the expense of this fstat. */ |
| 7408 | 1767 if (ISSET(FTS_LOGICAL) || ! HAVE_WORKING_O_NOFOLLOW |
| 7151 | 1768 || (dir && STREQ (dir, ".."))) |
| 1769 { | |
| 1770 struct stat sb; | |
| 1771 if (fstat(newfd, &sb)) | |
| 1772 { | |
| 5858 | 1773 ret = -1; |
| 1774 goto bail; | |
| 7151 | 1775 } |
| 1776 if (p->fts_statp->st_dev != sb.st_dev | |
| 1777 || p->fts_statp->st_ino != sb.st_ino) | |
| 1778 { | |
| 5858 | 1779 __set_errno (ENOENT); /* disinformation */ |
| 1780 ret = -1; | |
| 1781 goto bail; | |
| 7151 | 1782 } |
| 1783 } | |
| 1784 | |
| 1785 if (ISSET(FTS_CWDFD)) | |
| 1786 { | |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1787 cwd_advance_fd (sp, newfd, ! is_dotdot); |
| 7151 | 1788 return 0; |
| 1789 } | |
| 1790 | |
| 5858 | 1791 ret = fchdir(newfd); |
| 1792 bail: | |
| 1793 if (fd < 0) | |
| 7151 | 1794 { |
| 1795 int oerrno = errno; | |
| 1796 (void)close(newfd); | |
| 1797 __set_errno (oerrno); | |
| 1798 } | |
|
7639
1670d42131d7
Make fts (in FTS_CWDFD mode) more efficient by caching a few open
Jim Meyering <jim@meyering.net>
parents:
7635
diff
changeset
|
1799 return ret; |
| 5858 | 1800 } |