contrib/libarchive/cpio/cpio.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27
  28 #include "cpio_platform.h"
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/types.h>
  32 #include <archive.h>
  33 #include <archive_entry.h>
  34
  35 #ifdef HAVE_SYS_MKDEV_H
  36 #include <sys/mkdev.h>
  37 #endif
  38 #ifdef HAVE_SYS_STAT_H
  39 #include <sys/stat.h>
  40 #endif
  41 #ifdef HAVE_SYS_TIME_H
  42 #include <sys/time.h>
  43 #endif
  44 #ifdef HAVE_ERRNO_H
  45 #include <errno.h>
  46 #endif
  47 #ifdef HAVE_FCNTL_H
  48 #include <fcntl.h>
  49 #endif
  50 #ifdef HAVE_GRP_H
  51 #include <grp.h>
  52 #endif
  53 #ifdef HAVE_LOCALE_H
  54 #include <locale.h>
  55 #endif
  56 #ifdef HAVE_PWD_H
  57 #include <pwd.h>
  58 #endif
  59 #ifdef HAVE_SIGNAL_H
  60 #include <signal.h>
  61 #endif
  62 #ifdef HAVE_STDARG_H
  63 #include <stdarg.h>
  64 #endif
  65 #ifdef HAVE_STDINT_H
  66 #include <stdint.h>
  67 #endif
  68 #include <stdio.h>
  69 #ifdef HAVE_STDLIB_H
  70 #include <stdlib.h>
  71 #endif
  72 #ifdef HAVE_STRING_H
  73 #include <string.h>
  74 #endif
  75 #ifdef HAVE_UNISTD_H
  76 #include <unistd.h>
  77 #endif
  78 #ifdef HAVE_TIME_H
  79 #include <time.h>
  80 #endif
  81
  82 #include "cpio.h"
  83 #include "err.h"
  84 #include "line_reader.h"
  85
  86 /* Fixed size of uname/gname caches. */
  87 #define name_cache_size 101
  88
  89 #ifndef O_BINARY
  90 #define O_BINARY 0
  91 #endif
  92
  93 struct name_cache {
  94         int     probes;
  95         int     hits;
  96         size_t  size;
  97         struct {
  98                 id_t id;
  99                 char *name;
 100         } cache[name_cache_size];
 101 };
 102
 103 static int      extract_data(struct archive *, struct archive *);
 104 const char *    cpio_i64toa(int64_t);
 105 static const char *cpio_rename(const char *name);
 106 static int      entry_to_archive(struct cpio *, struct archive_entry *);
 107 static int      file_to_archive(struct cpio *, const char *);
 108 static void     free_cache(struct name_cache *cache);
 109 static void     list_item_verbose(struct cpio *, struct archive_entry *);
 110 static void     long_help(void);
 111 static const char *lookup_gname(struct cpio *, gid_t gid);
 112 static int      lookup_gname_helper(struct cpio *,
 113                     const char **name, id_t gid);
 114 static const char *lookup_uname(struct cpio *, uid_t uid);
 115 static int      lookup_uname_helper(struct cpio *,
 116                     const char **name, id_t uid);
 117 static void     mode_in(struct cpio *);
 118 static void     mode_list(struct cpio *);
 119 static void     mode_out(struct cpio *);
 120 static void     mode_pass(struct cpio *, const char *);
 121 static const char *remove_leading_slash(const char *);
 122 static int      restore_time(struct cpio *, struct archive_entry *,
 123                     const char *, int fd);
 124 static void     usage(void);
 125 static void     version(void);
 126
 127 int
 128 main(int argc, char *argv[])
 129 {
 130         static char buff[16384];
 131         struct cpio _cpio; /* Allocated on stack. */
 132         struct cpio *cpio;
 133         const char *errmsg;
 134         int uid, gid;
 135         int opt;
 136
 137         cpio = &_cpio;
 138         memset(cpio, 0, sizeof(*cpio));
 139         cpio->buff = buff;
 140         cpio->buff_size = sizeof(buff);
 141
 142 #if defined(HAVE_SIGACTION) && defined(SIGPIPE)
 143         { /* Ignore SIGPIPE signals. */
 144                 struct sigaction sa;
 145                 sigemptyset(&sa.sa_mask);
 146                 sa.sa_flags = 0;
 147                 sa.sa_handler = SIG_IGN;
 148                 sigaction(SIGPIPE, &sa, NULL);
 149         }
 150 #endif
 151
 152         /* Need lafe_progname before calling lafe_warnc. */
 153         if (*argv == NULL)
 154                 lafe_progname = "bsdcpio";
 155         else {
 156 #if defined(_WIN32) && !defined(__CYGWIN__)
 157                 lafe_progname = strrchr(*argv, '\\');
 158                 if (strrchr(*argv, '/') > lafe_progname)
 159 #endif
 160                 lafe_progname = strrchr(*argv, '/');
 161                 if (lafe_progname != NULL)
 162                         lafe_progname++;
 163                 else
 164                         lafe_progname = *argv;
 165         }
 166 #if HAVE_SETLOCALE
 167         if (setlocale(LC_ALL, "") == NULL)
 168                 lafe_warnc(0, "Failed to set default locale");
 169 #endif
 170
 171         cpio->uid_override = -1;
 172         cpio->gid_override = -1;
 173         cpio->argv = argv;
 174         cpio->argc = argc;
 175         cpio->mode = '\0';
 176         cpio->verbose = 0;
 177         cpio->compress = '\0';
 178         cpio->extract_flags = ARCHIVE_EXTRACT_NO_AUTODIR;
 179         cpio->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
 180         cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_SYMLINKS;
 181         cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_NODOTDOT;
 182         cpio->extract_flags |= ARCHIVE_EXTRACT_PERM;
 183         cpio->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
 184         cpio->extract_flags |= ARCHIVE_EXTRACT_ACL;
 185 #if !defined(_WIN32) && !defined(__CYGWIN__)
 186         if (geteuid() == 0)
 187                 cpio->extract_flags |= ARCHIVE_EXTRACT_OWNER;
 188 #endif
 189         cpio->bytes_per_block = 512;
 190         cpio->filename = NULL;
 191
 192         cpio->matching = archive_match_new();
 193         if (cpio->matching == NULL)
 194                 lafe_errc(1, 0, "Out of memory");
 195
 196         while ((opt = cpio_getopt(cpio)) != -1) {
 197                 switch (opt) {
 198                 case '0': /* GNU convention: --null, -0 */
 199                         cpio->option_null = 1;
 200                         break;
 201                 case 'A': /* NetBSD/OpenBSD */
 202                         cpio->option_append = 1;
 203                         break;
 204                 case 'a': /* POSIX 1997 */
 205                         cpio->option_atime_restore = 1;
 206                         break;
 207                 case 'B': /* POSIX 1997 */
 208                         cpio->bytes_per_block = 5120;
 209                         break;
 210                 case OPTION_B64ENCODE:
 211                         cpio->add_filter = opt;
 212                         break;
 213                 case 'C': /* NetBSD/OpenBSD */
 214                         cpio->bytes_per_block = atoi(cpio->argument);
 215                         if (cpio->bytes_per_block <= 0)
 216                                 lafe_errc(1, 0, "Invalid blocksize %s", cpio->argument);
 217                         break;
 218                 case 'c': /* POSIX 1997 */
 219                         cpio->format = "odc";
 220                         break;
 221                 case 'd': /* POSIX 1997 */
 222                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_NO_AUTODIR;
 223                         break;
 224                 case 'E': /* NetBSD/OpenBSD */
 225                         if (archive_match_include_pattern_from_file(
 226                             cpio->matching, cpio->argument,
 227                             cpio->option_null) != ARCHIVE_OK)
 228                                 lafe_errc(1, 0, "Error : %s",
 229                                     archive_error_string(cpio->matching));
 230                         break;
 231                 case 'F': /* NetBSD/OpenBSD/GNU cpio */
 232                         cpio->filename = cpio->argument;
 233                         break;
 234                 case 'f': /* POSIX 1997 */
 235                         if (archive_match_exclude_pattern(cpio->matching,
 236                             cpio->argument) != ARCHIVE_OK)
 237                                 lafe_errc(1, 0, "Error : %s",
 238                                     archive_error_string(cpio->matching));
 239                         break;
 240                 case OPTION_GRZIP:
 241                         cpio->compress = opt;
 242                         break;
 243                 case 'H': /* GNU cpio (also --format) */
 244                         cpio->format = cpio->argument;
 245                         break;
 246                 case 'h':
 247                         long_help();
 248                         break;
 249                 case 'I': /* NetBSD/OpenBSD */
 250                         cpio->filename = cpio->argument;
 251                         break;
 252                 case 'i': /* POSIX 1997 */
 253                         if (cpio->mode != '\0')
 254                                 lafe_errc(1, 0,
 255                                     "Cannot use both -i and -%c", cpio->mode);
 256                         cpio->mode = opt;
 257                         break;
 258                 case 'J': /* GNU tar, others */
 259                         cpio->compress = opt;
 260                         break;
 261                 case 'j': /* GNU tar, others */
 262                         cpio->compress = opt;
 263                         break;
 264                 case OPTION_INSECURE:
 265                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_SYMLINKS;
 266                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT;
 267                         break;
 268                 case 'L': /* GNU cpio */
 269                         cpio->option_follow_links = 1;
 270                         break;
 271                 case 'l': /* POSIX 1997 */
 272                         cpio->option_link = 1;
 273                         break;
 274                 case OPTION_LRZIP:
 275                 case OPTION_LZMA: /* GNU tar, others */
 276                 case OPTION_LZOP: /* GNU tar, others */
 277                         cpio->compress = opt;
 278                         break;
 279                 case 'm': /* POSIX 1997 */
 280                         cpio->extract_flags |= ARCHIVE_EXTRACT_TIME;
 281                         break;
 282                 case 'n': /* GNU cpio */
 283                         cpio->option_numeric_uid_gid = 1;
 284                         break;
 285                 case OPTION_NO_PRESERVE_OWNER: /* GNU cpio */
 286                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
 287                         break;
 288                 case 'O': /* GNU cpio */
 289                         cpio->filename = cpio->argument;
 290                         break;
 291                 case 'o': /* POSIX 1997 */
 292                         if (cpio->mode != '\0')
 293                                 lafe_errc(1, 0,
 294                                     "Cannot use both -o and -%c", cpio->mode);
 295                         cpio->mode = opt;
 296                         break;
 297                 case 'p': /* POSIX 1997 */
 298                         if (cpio->mode != '\0')
 299                                 lafe_errc(1, 0,
 300                                     "Cannot use both -p and -%c", cpio->mode);
 301                         cpio->mode = opt;
 302                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT;
 303                         break;
 304                 case OPTION_PRESERVE_OWNER:
 305                         cpio->extract_flags |= ARCHIVE_EXTRACT_OWNER;
 306                         break;
 307                 case OPTION_QUIET: /* GNU cpio */
 308                         cpio->quiet = 1;
 309                         break;
 310                 case 'R': /* GNU cpio, also --owner */
 311                         /* TODO: owner_parse should return uname/gname
 312                          * also; use that to set [ug]name_override. */
 313                         errmsg = owner_parse(cpio->argument, &uid, &gid);
 314                         if (errmsg) {
 315                                 lafe_warnc(-1, "%s", errmsg);
 316                                 usage();
 317                         }
 318                         if (uid != -1) {
 319                                 cpio->uid_override = uid;
 320                                 cpio->uname_override = NULL;
 321                         }
 322                         if (gid != -1) {
 323                                 cpio->gid_override = gid;
 324                                 cpio->gname_override = NULL;
 325                         }
 326                         break;
 327                 case 'r': /* POSIX 1997 */
 328                         cpio->option_rename = 1;
 329                         break;
 330                 case 't': /* POSIX 1997 */
 331                         cpio->option_list = 1;
 332                         break;
 333                 case 'u': /* POSIX 1997 */
 334                         cpio->extract_flags
 335                             &= ~ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
 336                         break;
 337                 case OPTION_UUENCODE:
 338                         cpio->add_filter = opt;
 339                         break;
 340                 case 'v': /* POSIX 1997 */
 341                         cpio->verbose++;
 342                         break;
 343                 case 'V': /* GNU cpio */
 344                         cpio->dot++;
 345                         break;
 346                 case OPTION_VERSION: /* GNU convention */
 347                         version();
 348                         break;
 349 #if 0
 350                 /*
 351                  * cpio_getopt() handles -W specially, so it's not
 352                  * available here.
 353                  */
 354                 case 'W': /* Obscure, but useful GNU convention. */
 355                         break;
 356 #endif
 357                 case 'y': /* tar convention */
 358                         cpio->compress = opt;
 359                         break;
 360                 case 'Z': /* tar convention */
 361                         cpio->compress = opt;
 362                         break;
 363                 case 'z': /* tar convention */
 364                         cpio->compress = opt;
 365                         break;
 366                 default:
 367                         usage();
 368                 }
 369         }
 370
 371         /*
 372          * Sanity-check args, error out on nonsensical combinations.
 373          */
 374         /* -t implies -i if no mode was specified. */
 375         if (cpio->option_list && cpio->mode == '\0')
 376                 cpio->mode = 'i';
 377         /* -t requires -i */
 378         if (cpio->option_list && cpio->mode != 'i')
 379                 lafe_errc(1, 0, "Option -t requires -i");
 380         /* -n requires -it */
 381         if (cpio->option_numeric_uid_gid && !cpio->option_list)
 382                 lafe_errc(1, 0, "Option -n requires -it");
 383         /* Can only specify format when writing */
 384         if (cpio->format != NULL && cpio->mode != 'o')
 385                 lafe_errc(1, 0, "Option --format requires -o");
 386         /* -l requires -p */
 387         if (cpio->option_link && cpio->mode != 'p')
 388                 lafe_errc(1, 0, "Option -l requires -p");
 389         /* -v overrides -V */
 390         if (cpio->dot && cpio->verbose)
 391                 cpio->dot = 0;
 392         /* TODO: Flag other nonsensical combinations. */
 393
 394         switch (cpio->mode) {
 395         case 'o':
 396                 /* TODO: Implement old binary format in libarchive,
 397                    use that here. */
 398                 if (cpio->format == NULL)
 399                         cpio->format = "odc"; /* Default format */
 400
 401                 mode_out(cpio);
 402                 break;
 403         case 'i':
 404                 while (*cpio->argv != NULL) {
 405                         if (archive_match_include_pattern(cpio->matching,
 406                             *cpio->argv) != ARCHIVE_OK)
 407                                 lafe_errc(1, 0, "Error : %s",
 408                                     archive_error_string(cpio->matching));
 409                         --cpio->argc;
 410                         ++cpio->argv;
 411                 }
 412                 if (cpio->option_list)
 413                         mode_list(cpio);
 414                 else
 415                         mode_in(cpio);
 416                 break;
 417         case 'p':
 418                 if (*cpio->argv == NULL || **cpio->argv == '\0')
 419                         lafe_errc(1, 0,
 420                             "-p mode requires a target directory");
 421                 mode_pass(cpio, *cpio->argv);
 422                 break;
 423         default:
 424                 lafe_errc(1, 0,
 425                     "Must specify at least one of -i, -o, or -p");
 426         }
 427
 428         archive_match_free(cpio->matching);
 429         free_cache(cpio->gname_cache);
 430         free_cache(cpio->uname_cache);
 431         free(cpio->destdir);
 432         return (cpio->return_value);
 433 }
 434
 435 static void
 436 usage(void)
 437 {
 438         const char      *p;
 439
 440         p = lafe_progname;
 441
 442         fprintf(stderr, "Brief Usage:\n");
 443         fprintf(stderr, "  List:    %s -it < archive\n", p);
 444         fprintf(stderr, "  Extract: %s -i < archive\n", p);
 445         fprintf(stderr, "  Create:  %s -o < filenames > archive\n", p);
 446         fprintf(stderr, "  Help:    %s --help\n", p);
 447         exit(1);
 448 }
 449
 450 static const char *long_help_msg =
 451         "First option must be a mode specifier:\n"
 452         "  -i Input  -o Output  -p Pass\n"
 453         "Common Options:\n"
 454         "  -v Verbose filenames     -V  one dot per file\n"
 455         "Create: %p -o [options]  < [list of files] > [archive]\n"
 456         "  -J,-y,-z,--lzma  Compress archive with xz/bzip2/gzip/lzma\n"
 457         "  --format {odc|newc|ustar}  Select archive format\n"
 458         "List: %p -it < [archive]\n"
 459         "Extract: %p -i [options] < [archive]\n";
 460
 461
 462 /*
 463  * Note that the word 'bsdcpio' will always appear in the first line
 464  * of output.
 465  *
 466  * In particular, /bin/sh scripts that need to test for the presence
 467  * of bsdcpio can use the following template:
 468  *
 469  * if (cpio --help 2>&1 | grep bsdcpio >/dev/null 2>&1 ) then \
 470  *          echo bsdcpio; else echo not bsdcpio; fi
 471  */
 472 static void
 473 long_help(void)
 474 {
 475         const char      *prog;
 476         const char      *p;
 477
 478         prog = lafe_progname;
 479
 480         fflush(stderr);
 481
 482         p = (strcmp(prog,"bsdcpio") != 0) ? "(bsdcpio)" : "";
 483         printf("%s%s: manipulate archive files\n", prog, p);
 484
 485         for (p = long_help_msg; *p != '\0'; p++) {
 486                 if (*p == '%') {
 487                         if (p[1] == 'p') {
 488                                 fputs(prog, stdout);
 489                                 p++;
 490                         } else
 491                                 putchar('%');
 492                 } else
 493                         putchar(*p);
 494         }
 495         version();
 496 }
 497
 498 static void
 499 version(void)
 500 {
 501         fprintf(stdout,"bsdcpio %s -- %s\n",
 502             BSDCPIO_VERSION_STRING,
 503             archive_version_string());
 504         exit(0);
 505 }
 506
 507 static void
 508 mode_out(struct cpio *cpio)
 509 {
 510         struct archive_entry *entry, *spare;
 511         struct lafe_line_reader *lr;
 512         const char *p;
 513         int r;
 514
 515         if (cpio->option_append)
 516                 lafe_errc(1, 0, "Append mode not yet supported.");
 517
 518         cpio->archive_read_disk = archive_read_disk_new();
 519         if (cpio->archive_read_disk == NULL)
 520                 lafe_errc(1, 0, "Failed to allocate archive object");
 521         if (cpio->option_follow_links)
 522                 archive_read_disk_set_symlink_logical(cpio->archive_read_disk);
 523         else
 524                 archive_read_disk_set_symlink_physical(cpio->archive_read_disk);
 525         archive_read_disk_set_standard_lookup(cpio->archive_read_disk);
 526
 527         cpio->archive = archive_write_new();
 528         if (cpio->archive == NULL)
 529                 lafe_errc(1, 0, "Failed to allocate archive object");
 530         switch (cpio->compress) {
 531         case OPTION_GRZIP:
 532                 r = archive_write_add_filter_grzip(cpio->archive);
 533                 break;
 534         case 'J':
 535                 r = archive_write_add_filter_xz(cpio->archive);
 536                 break;
 537         case OPTION_LRZIP:
 538                 r = archive_write_add_filter_lrzip(cpio->archive);
 539                 break;
 540         case OPTION_LZMA:
 541                 r = archive_write_add_filter_lzma(cpio->archive);
 542                 break;
 543         case OPTION_LZOP:
 544                 r = archive_write_add_filter_lzop(cpio->archive);
 545                 break;
 546         case 'j': case 'y':
 547                 r = archive_write_add_filter_bzip2(cpio->archive);
 548                 break;
 549         case 'z':
 550                 r = archive_write_add_filter_gzip(cpio->archive);
 551                 break;
 552         case 'Z':
 553                 r = archive_write_add_filter_compress(cpio->archive);
 554                 break;
 555         default:
 556                 r = archive_write_add_filter_none(cpio->archive);
 557                 break;
 558         }
 559         if (r < ARCHIVE_WARN)
 560                 lafe_errc(1, 0, "Requested compression not available");
 561         switch (cpio->add_filter) {
 562         case 0:
 563                 r = ARCHIVE_OK;
 564                 break;
 565         case OPTION_B64ENCODE:
 566                 r = archive_write_add_filter_b64encode(cpio->archive);
 567                 break;
 568         case OPTION_UUENCODE:
 569                 r = archive_write_add_filter_uuencode(cpio->archive);
 570                 break;
 571         }
 572         if (r < ARCHIVE_WARN)
 573                 lafe_errc(1, 0, "Requested filter not available");
 574         r = archive_write_set_format_by_name(cpio->archive, cpio->format);
 575         if (r != ARCHIVE_OK)
 576                 lafe_errc(1, 0, "%s", archive_error_string(cpio->archive));
 577         archive_write_set_bytes_per_block(cpio->archive, cpio->bytes_per_block);
 578         cpio->linkresolver = archive_entry_linkresolver_new();
 579         archive_entry_linkresolver_set_strategy(cpio->linkresolver,
 580             archive_format(cpio->archive));
 581
 582         /*
 583          * The main loop:  Copy each file into the output archive.
 584          */
 585         r = archive_write_open_filename(cpio->archive, cpio->filename);
 586         if (r != ARCHIVE_OK)
 587                 lafe_errc(1, 0, "%s", archive_error_string(cpio->archive));
 588         lr = lafe_line_reader("-", cpio->option_null);
 589         while ((p = lafe_line_reader_next(lr)) != NULL)
 590                 file_to_archive(cpio, p);
 591         lafe_line_reader_free(lr);
 592
 593         /*
 594          * The hardlink detection may have queued up a couple of entries
 595          * that can now be flushed.
 596          */
 597         entry = NULL;
 598         archive_entry_linkify(cpio->linkresolver, &entry, &spare);
 599         while (entry != NULL) {
 600                 entry_to_archive(cpio, entry);
 601                 archive_entry_free(entry);
 602                 entry = NULL;
 603                 archive_entry_linkify(cpio->linkresolver, &entry, &spare);
 604         }
 605
 606         r = archive_write_close(cpio->archive);
 607         if (cpio->dot)
 608                 fprintf(stderr, "\n");
 609         if (r != ARCHIVE_OK)
 610                 lafe_errc(1, 0, "%s", archive_error_string(cpio->archive));
 611
 612         if (!cpio->quiet) {
 613                 int64_t blocks =
 614                         (archive_filter_bytes(cpio->archive, 0) + 511)
 615                         / 512;
 616                 fprintf(stderr, "%lu %s\n", (unsigned long)blocks,
 617                     blocks == 1 ? "block" : "blocks");
 618         }
 619         archive_write_free(cpio->archive);
 620 }
 621
 622 static const char *
 623 remove_leading_slash(const char *p)
 624 {
 625         const char *rp;
 626
 627         /* Remove leading "//./" or "//?/" or "//?/UNC/"
 628          * (absolute path prefixes used by Windows API) */
 629         if ((p[0] == '/' || p[0] == '\\') &&
 630             (p[1] == '/' || p[1] == '\\') &&
 631             (p[2] == '.' || p[2] == '?') &&
 632             (p[3] == '/' || p[3] == '\\'))
 633         {
 634                 if (p[2] == '?' &&
 635                     (p[4] == 'U' || p[4] == 'u') &&
 636                     (p[5] == 'N' || p[5] == 'n') &&
 637                     (p[6] == 'C' || p[6] == 'c') &&
 638                     (p[7] == '/' || p[7] == '\\'))
 639                         p += 8;
 640                 else
 641                         p += 4;
 642         }
 643         do {
 644                 rp = p;
 645                 /* Remove leading drive letter from archives created
 646                  * on Windows. */
 647                 if (((p[0] >= 'a' && p[0] <= 'z') ||
 648                      (p[0] >= 'A' && p[0] <= 'Z')) &&
 649                          p[1] == ':') {
 650                         p += 2;
 651                 }
 652                 /* Remove leading "/../", "//", etc. */
 653                 while (p[0] == '/' || p[0] == '\\') {
 654                         if (p[1] == '.' && p[2] == '.' &&
 655                                 (p[3] == '/' || p[3] == '\\')) {
 656                                 p += 3; /* Remove "/..", leave "/"
 657                                          * for next pass. */
 658                         } else
 659                                 p += 1; /* Remove "/". */
 660                 }
 661         } while (rp != p);
 662         return (p);
 663 }
 664
 665 /*
 666  * This is used by both out mode (to copy objects from disk into
 667  * an archive) and pass mode (to copy objects from disk to
 668  * an archive_write_disk "archive").
 669  */
 670 static int
 671 file_to_archive(struct cpio *cpio, const char *srcpath)
 672 {
 673         const char *destpath;
 674         struct archive_entry *entry, *spare;
 675         size_t len;
 676         int r;
 677
 678         /*
 679          * Create an archive_entry describing the source file.
 680          *
 681          */
 682         entry = archive_entry_new();
 683         if (entry == NULL)
 684                 lafe_errc(1, 0, "Couldn't allocate entry");
 685         archive_entry_copy_sourcepath(entry, srcpath);
 686         r = archive_read_disk_entry_from_file(cpio->archive_read_disk,
 687             entry, -1, NULL);
 688         if (r < ARCHIVE_FAILED)
 689                 lafe_errc(1, 0, "%s",
 690                     archive_error_string(cpio->archive_read_disk));
 691         if (r < ARCHIVE_OK)
 692                 lafe_warnc(0, "%s",
 693                     archive_error_string(cpio->archive_read_disk));
 694         if (r <= ARCHIVE_FAILED) {
 695                 cpio->return_value = 1;
 696                 return (r);
 697         }
 698
 699         if (cpio->uid_override >= 0) {
 700                 archive_entry_set_uid(entry, cpio->uid_override);
 701                 archive_entry_set_uname(entry, cpio->uname_override);
 702         }
 703         if (cpio->gid_override >= 0) {
 704                 archive_entry_set_gid(entry, cpio->gid_override);
 705                 archive_entry_set_gname(entry, cpio->gname_override);
 706         }
 707
 708         /*
 709          * Generate a destination path for this entry.
 710          * "destination path" is the name to which it will be copied in
 711          * pass mode or the name that will go into the archive in
 712          * output mode.
 713          */
 714         destpath = srcpath;
 715         if (cpio->destdir) {
 716                 len = strlen(cpio->destdir) + strlen(srcpath) + 8;
 717                 if (len >= cpio->pass_destpath_alloc) {
 718                         while (len >= cpio->pass_destpath_alloc) {
 719                                 cpio->pass_destpath_alloc += 512;
 720                                 cpio->pass_destpath_alloc *= 2;
 721                         }
 722                         free(cpio->pass_destpath);
 723                         cpio->pass_destpath = malloc(cpio->pass_destpath_alloc);
 724                         if (cpio->pass_destpath == NULL)
 725                                 lafe_errc(1, ENOMEM,
 726                                     "Can't allocate path buffer");
 727                 }
 728                 strcpy(cpio->pass_destpath, cpio->destdir);
 729                 strcat(cpio->pass_destpath, remove_leading_slash(srcpath));
 730                 destpath = cpio->pass_destpath;
 731         }
 732         if (cpio->option_rename)
 733                 destpath = cpio_rename(destpath);
 734         if (destpath == NULL)
 735                 return (0);
 736         archive_entry_copy_pathname(entry, destpath);
 737
 738         /*
 739          * If we're trying to preserve hardlinks, match them here.
 740          */
 741         spare = NULL;
 742         if (cpio->linkresolver != NULL
 743             && archive_entry_filetype(entry) != AE_IFDIR) {
 744                 archive_entry_linkify(cpio->linkresolver, &entry, &spare);
 745         }
 746
 747         if (entry != NULL) {
 748                 r = entry_to_archive(cpio, entry);
 749                 archive_entry_free(entry);
 750                 if (spare != NULL) {
 751                         if (r == 0)
 752                                 r = entry_to_archive(cpio, spare);
 753                         archive_entry_free(spare);
 754                 }
 755         }
 756         return (r);
 757 }
 758
 759 static int
 760 entry_to_archive(struct cpio *cpio, struct archive_entry *entry)
 761 {
 762         const char *destpath = archive_entry_pathname(entry);
 763         const char *srcpath = archive_entry_sourcepath(entry);
 764         int fd = -1;
 765         ssize_t bytes_read;
 766         int r;
 767
 768         /* Print out the destination name to the user. */
 769         if (cpio->verbose)
 770                 fprintf(stderr,"%s", destpath);
 771         if (cpio->dot)
 772                 fprintf(stderr, ".");
 773
 774         /*
 775          * Option_link only makes sense in pass mode and for
 776          * regular files.  Also note: if a link operation fails
 777          * because of cross-device restrictions, we'll fall back
 778          * to copy mode for that entry.
 779          *
 780          * TODO: Test other cpio implementations to see if they
 781          * hard-link anything other than regular files here.
 782          */
 783         if (cpio->option_link
 784             && archive_entry_filetype(entry) == AE_IFREG)
 785         {
 786                 struct archive_entry *t;
 787                 /* Save the original entry in case we need it later. */
 788                 t = archive_entry_clone(entry);
 789                 if (t == NULL)
 790                         lafe_errc(1, ENOMEM, "Can't create link");
 791                 /* Note: link(2) doesn't create parent directories,
 792                  * so we use archive_write_header() instead as a
 793                  * convenience. */
 794                 archive_entry_set_hardlink(t, srcpath);
 795                 /* This is a straight link that carries no data. */
 796                 archive_entry_set_size(t, 0);
 797                 r = archive_write_header(cpio->archive, t);
 798                 archive_entry_free(t);
 799                 if (r != ARCHIVE_OK)
 800                         lafe_warnc(archive_errno(cpio->archive),
 801                             "%s", archive_error_string(cpio->archive));
 802                 if (r == ARCHIVE_FATAL)
 803                         exit(1);
 804 #ifdef EXDEV
 805                 if (r != ARCHIVE_OK && archive_errno(cpio->archive) == EXDEV) {
 806                         /* Cross-device link:  Just fall through and use
 807                          * the original entry to copy the file over. */
 808                         lafe_warnc(0, "Copying file instead");
 809                 } else
 810 #endif
 811                 return (0);
 812         }
 813
 814         /*
 815          * Make sure we can open the file (if necessary) before
 816          * trying to write the header.
 817          */
 818         if (archive_entry_filetype(entry) == AE_IFREG) {
 819                 if (archive_entry_size(entry) > 0) {
 820                         fd = open(srcpath, O_RDONLY | O_BINARY);
 821                         if (fd < 0) {
 822                                 lafe_warnc(errno,
 823                                     "%s: could not open file", srcpath);
 824                                 goto cleanup;
 825                         }
 826                 }
 827         } else {
 828                 archive_entry_set_size(entry, 0);
 829         }
 830
 831         r = archive_write_header(cpio->archive, entry);
 832
 833         if (r != ARCHIVE_OK)
 834                 lafe_warnc(archive_errno(cpio->archive),
 835                     "%s: %s",
 836                     srcpath,
 837                     archive_error_string(cpio->archive));
 838
 839         if (r == ARCHIVE_FATAL)
 840                 exit(1);
 841
 842         if (r >= ARCHIVE_WARN && archive_entry_size(entry) > 0 && fd >= 0) {
 843                 bytes_read = read(fd, cpio->buff, (unsigned)cpio->buff_size);
 844                 while (bytes_read > 0) {
 845                         ssize_t bytes_write;
 846                         bytes_write = archive_write_data(cpio->archive,
 847                             cpio->buff, bytes_read);
 848                         if (bytes_write < 0)
 849                                 lafe_errc(1, archive_errno(cpio->archive),
 850                                     "%s", archive_error_string(cpio->archive));
 851                         if (bytes_write < bytes_read) {
 852                                 lafe_warnc(0,
 853                                     "Truncated write; file may have "
 854                                     "grown while being archived.");
 855                         }
 856                         bytes_read = read(fd, cpio->buff,
 857                             (unsigned)cpio->buff_size);
 858                 }
 859         }
 860
 861         fd = restore_time(cpio, entry, srcpath, fd);
 862
 863 cleanup:
 864         if (cpio->verbose)
 865                 fprintf(stderr,"\n");
 866         if (fd >= 0)
 867                 close(fd);
 868         return (0);
 869 }
 870
 871 static int
 872 restore_time(struct cpio *cpio, struct archive_entry *entry,
 873     const char *name, int fd)
 874 {
 875 #ifndef HAVE_UTIMES
 876         static int warned = 0;
 877
 878         (void)cpio; /* UNUSED */
 879         (void)entry; /* UNUSED */
 880         (void)name; /* UNUSED */
 881
 882         if (!warned)
 883                 lafe_warnc(0, "Can't restore access times on this platform");
 884         warned = 1;
 885         return (fd);
 886 #else
 887 #if defined(_WIN32) && !defined(__CYGWIN__)
 888         struct __timeval times[2];
 889 #else
 890         struct timeval times[2];
 891 #endif
 892
 893         if (!cpio->option_atime_restore)
 894                 return (fd);
 895
 896         times[1].tv_sec = archive_entry_mtime(entry);
 897         times[1].tv_usec = archive_entry_mtime_nsec(entry) / 1000;
 898
 899         times[0].tv_sec = archive_entry_atime(entry);
 900         times[0].tv_usec = archive_entry_atime_nsec(entry) / 1000;
 901
 902 #if defined(HAVE_FUTIMES) && !defined(__CYGWIN__)
 903         if (fd >= 0 && futimes(fd, times) == 0)
 904                 return (fd);
 905 #endif
 906         /*
 907          * Some platform cannot restore access times if the file descriptor
 908          * is still opened.
 909          */
 910         if (fd >= 0) {
 911                 close(fd);
 912                 fd = -1;
 913         }
 914
 915 #ifdef HAVE_LUTIMES
 916         if (lutimes(name, times) != 0)
 917 #else
 918         if ((AE_IFLNK != archive_entry_filetype(entry))
 919                         && utimes(name, times) != 0)
 920 #endif
 921                 lafe_warnc(errno, "Can't update time for %s", name);
 922 #endif
 923         return (fd);
 924 }
 925
 926
 927 static void
 928 mode_in(struct cpio *cpio)
 929 {
 930         struct archive *a;
 931         struct archive_entry *entry;
 932         struct archive *ext;
 933         const char *destpath;
 934         int r;
 935
 936         ext = archive_write_disk_new();
 937         if (ext == NULL)
 938                 lafe_errc(1, 0, "Couldn't allocate restore object");
 939         r = archive_write_disk_set_options(ext, cpio->extract_flags);
 940         if (r != ARCHIVE_OK)
 941                 lafe_errc(1, 0, "%s", archive_error_string(ext));
 942         a = archive_read_new();
 943         if (a == NULL)
 944                 lafe_errc(1, 0, "Couldn't allocate archive object");
 945         archive_read_support_filter_all(a);
 946         archive_read_support_format_all(a);
 947
 948         if (archive_read_open_filename(a, cpio->filename,
 949                                         cpio->bytes_per_block))
 950                 lafe_errc(1, archive_errno(a),
 951                     "%s", archive_error_string(a));
 952         for (;;) {
 953                 r = archive_read_next_header(a, &entry);
 954                 if (r == ARCHIVE_EOF)
 955                         break;
 956                 if (r != ARCHIVE_OK) {
 957                         lafe_errc(1, archive_errno(a),
 958                             "%s", archive_error_string(a));
 959                 }
 960                 if (archive_match_path_excluded(cpio->matching, entry))
 961                         continue;
 962                 if (cpio->option_rename) {
 963                         destpath = cpio_rename(archive_entry_pathname(entry));
 964                         archive_entry_set_pathname(entry, destpath);
 965                 } else
 966                         destpath = archive_entry_pathname(entry);
 967                 if (destpath == NULL)
 968                         continue;
 969                 if (cpio->verbose)
 970                         fprintf(stderr, "%s\n", destpath);
 971                 if (cpio->dot)
 972                         fprintf(stderr, ".");
 973                 if (cpio->uid_override >= 0)
 974                         archive_entry_set_uid(entry, cpio->uid_override);
 975                 if (cpio->gid_override >= 0)
 976                         archive_entry_set_gid(entry, cpio->gid_override);
 977                 r = archive_write_header(ext, entry);
 978                 if (r != ARCHIVE_OK) {
 979                         fprintf(stderr, "%s: %s\n",
 980                             archive_entry_pathname(entry),
 981                             archive_error_string(ext));
 982                 } else if (!archive_entry_size_is_set(entry)
 983                     || archive_entry_size(entry) > 0) {
 984                         r = extract_data(a, ext);
 985                         if (r != ARCHIVE_OK)
 986                                 cpio->return_value = 1;
 987                 }
 988         }
 989         r = archive_read_close(a);
 990         if (cpio->dot)
 991                 fprintf(stderr, "\n");
 992         if (r != ARCHIVE_OK)
 993                 lafe_errc(1, 0, "%s", archive_error_string(a));
 994         r = archive_write_close(ext);
 995         if (r != ARCHIVE_OK)
 996                 lafe_errc(1, 0, "%s", archive_error_string(ext));
 997         if (!cpio->quiet) {
 998                 int64_t blocks = (archive_filter_bytes(a, 0) + 511)
 999                               / 512;
1000                 fprintf(stderr, "%lu %s\n", (unsigned long)blocks,
1001                     blocks == 1 ? "block" : "blocks");
1002         }
1003         archive_read_free(a);
1004         archive_write_free(ext);
1005         exit(cpio->return_value);
1006 }
1007
1008 /*
1009  * Exits if there's a fatal error.  Returns ARCHIVE_OK
1010  * if everything is kosher.
1011  */
1012 static int
1013 extract_data(struct archive *ar, struct archive *aw)
1014 {
1015         int r;
1016         size_t size;
1017         const void *block;
1018         int64_t offset;
1019
1020         for (;;) {
1021                 r = archive_read_data_block(ar, &block, &size, &offset);
1022                 if (r == ARCHIVE_EOF)
1023                         return (ARCHIVE_OK);
1024                 if (r != ARCHIVE_OK) {
1025                         lafe_warnc(archive_errno(ar),
1026                             "%s", archive_error_string(ar));
1027                         exit(1);
1028                 }
1029                 r = (int)archive_write_data_block(aw, block, size, offset);
1030                 if (r != ARCHIVE_OK) {
1031                         lafe_warnc(archive_errno(aw),
1032                             "%s", archive_error_string(aw));
1033                         return (r);
1034                 }
1035         }
1036 }
1037
1038 static void
1039 mode_list(struct cpio *cpio)
1040 {
1041         struct archive *a;
1042         struct archive_entry *entry;
1043         int r;
1044
1045         a = archive_read_new();
1046         if (a == NULL)
1047                 lafe_errc(1, 0, "Couldn't allocate archive object");
1048         archive_read_support_filter_all(a);
1049         archive_read_support_format_all(a);
1050
1051         if (archive_read_open_filename(a, cpio->filename,
1052                                         cpio->bytes_per_block))
1053                 lafe_errc(1, archive_errno(a),
1054                     "%s", archive_error_string(a));
1055         for (;;) {
1056                 r = archive_read_next_header(a, &entry);
1057                 if (r == ARCHIVE_EOF)
1058                         break;
1059                 if (r != ARCHIVE_OK) {
1060                         lafe_errc(1, archive_errno(a),
1061                             "%s", archive_error_string(a));
1062                 }
1063                 if (archive_match_path_excluded(cpio->matching, entry))
1064                         continue;
1065                 if (cpio->verbose)
1066                         list_item_verbose(cpio, entry);
1067                 else
1068                         fprintf(stdout, "%s\n", archive_entry_pathname(entry));
1069         }
1070         r = archive_read_close(a);
1071         if (r != ARCHIVE_OK)
1072                 lafe_errc(1, 0, "%s", archive_error_string(a));
1073         if (!cpio->quiet) {
1074                 int64_t blocks = (archive_filter_bytes(a, 0) + 511)
1075                               / 512;
1076                 fprintf(stderr, "%lu %s\n", (unsigned long)blocks,
1077                     blocks == 1 ? "block" : "blocks");
1078         }
1079         archive_read_free(a);
1080         exit(0);
1081 }
1082
1083 /*
1084  * Display information about the current file.
1085  *
1086  * The format here roughly duplicates the output of 'ls -l'.
1087  * This is based on SUSv2, where 'tar tv' is documented as
1088  * listing additional information in an "unspecified format,"
1089  * and 'pax -l' is documented as using the same format as 'ls -l'.
1090  */
1091 static void
1092 list_item_verbose(struct cpio *cpio, struct archive_entry *entry)
1093 {
1094         char                     size[32];
1095         char                     date[32];
1096         char                     uids[16], gids[16];
1097         const char              *uname, *gname;
1098         FILE                    *out = stdout;
1099         const char              *fmt;
1100         time_t                   mtime;
1101         static time_t            now;
1102
1103         if (!now)
1104                 time(&now);
1105
1106         if (cpio->option_numeric_uid_gid) {
1107                 /* Format numeric uid/gid for display. */
1108                 strcpy(uids, cpio_i64toa(archive_entry_uid(entry)));
1109                 uname = uids;
1110                 strcpy(gids, cpio_i64toa(archive_entry_gid(entry)));
1111                 gname = gids;
1112         } else {
1113                 /* Use uname if it's present, else lookup name from uid. */
1114                 uname = archive_entry_uname(entry);
1115                 if (uname == NULL)
1116                         uname = lookup_uname(cpio, (uid_t)archive_entry_uid(entry));
1117                 /* Use gname if it's present, else lookup name from gid. */
1118                 gname = archive_entry_gname(entry);
1119                 if (gname == NULL)
1120                         gname = lookup_gname(cpio, (uid_t)archive_entry_gid(entry));
1121         }
1122
1123         /* Print device number or file size. */
1124         if (archive_entry_filetype(entry) == AE_IFCHR
1125             || archive_entry_filetype(entry) == AE_IFBLK) {
1126                 snprintf(size, sizeof(size), "%lu,%lu",
1127                     (unsigned long)archive_entry_rdevmajor(entry),
1128                     (unsigned long)archive_entry_rdevminor(entry));
1129         } else {
1130                 strcpy(size, cpio_i64toa(archive_entry_size(entry)));
1131         }
1132
1133         /* Format the time using 'ls -l' conventions. */
1134         mtime = archive_entry_mtime(entry);
1135 #if defined(_WIN32) && !defined(__CYGWIN__)
1136         /* Windows' strftime function does not support %e format. */
1137         if (mtime - now > 365*86400/2
1138                 || mtime - now < -365*86400/2)
1139                 fmt = cpio->day_first ? "%d %b  %Y" : "%b %d  %Y";
1140         else
1141                 fmt = cpio->day_first ? "%d %b %H:%M" : "%b %d %H:%M";
1142 #else
1143         if (abs(mtime - now) > (365/2)*86400)
1144                 fmt = cpio->day_first ? "%e %b  %Y" : "%b %e  %Y";
1145         else
1146                 fmt = cpio->day_first ? "%e %b %H:%M" : "%b %e %H:%M";
1147 #endif
1148         strftime(date, sizeof(date), fmt, localtime(&mtime));
1149
1150         fprintf(out, "%s%3d %-8s %-8s %8s %12s %s",
1151             archive_entry_strmode(entry),
1152             archive_entry_nlink(entry),
1153             uname, gname, size, date,
1154             archive_entry_pathname(entry));
1155
1156         /* Extra information for links. */
1157         if (archive_entry_hardlink(entry)) /* Hard link */
1158                 fprintf(out, " link to %s", archive_entry_hardlink(entry));
1159         else if (archive_entry_symlink(entry)) /* Symbolic link */
1160                 fprintf(out, " -> %s", archive_entry_symlink(entry));
1161         fprintf(out, "\n");
1162 }
1163
1164 static void
1165 mode_pass(struct cpio *cpio, const char *destdir)
1166 {
1167         struct lafe_line_reader *lr;
1168         const char *p;
1169         int r;
1170
1171         /* Ensure target dir has a trailing '/' to simplify path surgery. */
1172         cpio->destdir = malloc(strlen(destdir) + 8);
1173         strcpy(cpio->destdir, destdir);
1174         if (destdir[strlen(destdir) - 1] != '/')
1175                 strcat(cpio->destdir, "/");
1176
1177         cpio->archive = archive_write_disk_new();
1178         if (cpio->archive == NULL)
1179                 lafe_errc(1, 0, "Failed to allocate archive object");
1180         r = archive_write_disk_set_options(cpio->archive, cpio->extract_flags);
1181         if (r != ARCHIVE_OK)
1182                 lafe_errc(1, 0, "%s", archive_error_string(cpio->archive));
1183         cpio->linkresolver = archive_entry_linkresolver_new();
1184         archive_write_disk_set_standard_lookup(cpio->archive);
1185
1186         cpio->archive_read_disk = archive_read_disk_new();
1187         if (cpio->archive_read_disk == NULL)
1188                 lafe_errc(1, 0, "Failed to allocate archive object");
1189         if (cpio->option_follow_links)
1190                 archive_read_disk_set_symlink_logical(cpio->archive_read_disk);
1191         else
1192                 archive_read_disk_set_symlink_physical(cpio->archive_read_disk);
1193         archive_read_disk_set_standard_lookup(cpio->archive_read_disk);
1194
1195         lr = lafe_line_reader("-", cpio->option_null);
1196         while ((p = lafe_line_reader_next(lr)) != NULL)
1197                 file_to_archive(cpio, p);
1198         lafe_line_reader_free(lr);
1199
1200         archive_entry_linkresolver_free(cpio->linkresolver);
1201         r = archive_write_close(cpio->archive);
1202         if (cpio->dot)
1203                 fprintf(stderr, "\n");
1204         if (r != ARCHIVE_OK)
1205                 lafe_errc(1, 0, "%s", archive_error_string(cpio->archive));
1206
1207         if (!cpio->quiet) {
1208                 int64_t blocks =
1209                         (archive_filter_bytes(cpio->archive, 0) + 511)
1210                         / 512;
1211                 fprintf(stderr, "%lu %s\n", (unsigned long)blocks,
1212                     blocks == 1 ? "block" : "blocks");
1213         }
1214
1215         archive_write_free(cpio->archive);
1216 }
1217
1218 /*
1219  * Prompt for a new name for this entry.  Returns a pointer to the
1220  * new name or NULL if the entry should not be copied.  This
1221  * implements the semantics defined in POSIX.1-1996, which specifies
1222  * that an input of '.' means the name should be unchanged.  GNU cpio
1223  * treats '.' as a literal new name.
1224  */
1225 static const char *
1226 cpio_rename(const char *name)
1227 {
1228         static char buff[1024];
1229         FILE *t;
1230         char *p, *ret;
1231 #if defined(_WIN32) && !defined(__CYGWIN__)
1232         FILE *to;
1233
1234         t = fopen("CONIN$", "r");
1235         if (t == NULL)
1236                 return (name);
1237         to = fopen("CONOUT$", "w");
1238         if (to == NULL)
1239                 return (name);
1240         fprintf(to, "%s (Enter/./(new name))? ", name);
1241         fclose(to);
1242 #else
1243         t = fopen("/dev/tty", "r+");
1244         if (t == NULL)
1245                 return (name);
1246         fprintf(t, "%s (Enter/./(new name))? ", name);
1247         fflush(t);
1248 #endif
1249
1250         p = fgets(buff, sizeof(buff), t);
1251         fclose(t);
1252         if (p == NULL)
1253                 /* End-of-file is a blank line. */
1254                 return (NULL);
1255
1256         while (*p == ' ' || *p == '\t')
1257                 ++p;
1258         if (*p == '\n' || *p == '\0')
1259                 /* Empty line. */
1260                 return (NULL);
1261         if (*p == '.' && p[1] == '\n')
1262                 /* Single period preserves original name. */
1263                 return (name);
1264         ret = p;
1265         /* Trim the final newline. */
1266         while (*p != '\0' && *p != '\n')
1267                 ++p;
1268         /* Overwrite the final \n with a null character. */
1269         *p = '\0';
1270         return (ret);
1271 }
1272
1273 static void
1274 free_cache(struct name_cache *cache)
1275 {
1276         size_t i;
1277
1278         if (cache != NULL) {
1279                 for (i = 0; i < cache->size; i++)
1280                         free(cache->cache[i].name);
1281                 free(cache);
1282         }
1283 }
1284
1285 /*
1286  * Lookup uname/gname from uid/gid, return NULL if no match.
1287  */
1288 static const char *
1289 lookup_name(struct cpio *cpio, struct name_cache **name_cache_variable,
1290     int (*lookup_fn)(struct cpio *, const char **, id_t), id_t id)
1291 {
1292         char asnum[16];
1293         struct name_cache       *cache;
1294         const char *name;
1295         int slot;
1296
1297
1298         if (*name_cache_variable == NULL) {
1299                 *name_cache_variable = malloc(sizeof(struct name_cache));
1300                 if (*name_cache_variable == NULL)
1301                         lafe_errc(1, ENOMEM, "No more memory");
1302                 memset(*name_cache_variable, 0, sizeof(struct name_cache));
1303                 (*name_cache_variable)->size = name_cache_size;
1304         }
1305
1306         cache = *name_cache_variable;
1307         cache->probes++;
1308
1309         slot = id % cache->size;
1310         if (cache->cache[slot].name != NULL) {
1311                 if (cache->cache[slot].id == id) {
1312                         cache->hits++;
1313                         return (cache->cache[slot].name);
1314                 }
1315                 free(cache->cache[slot].name);
1316                 cache->cache[slot].name = NULL;
1317         }
1318
1319         if (lookup_fn(cpio, &name, id) == 0) {
1320                 if (name == NULL || name[0] == '\0') {
1321                         /* If lookup failed, format it as a number. */
1322                         snprintf(asnum, sizeof(asnum), "%u", (unsigned)id);
1323                         name = asnum;
1324                 }
1325                 cache->cache[slot].name = strdup(name);
1326                 if (cache->cache[slot].name != NULL) {
1327                         cache->cache[slot].id = id;
1328                         return (cache->cache[slot].name);
1329                 }
1330                 /*
1331                  * Conveniently, NULL marks an empty slot, so
1332                  * if the strdup() fails, we've just failed to
1333                  * cache it.  No recovery necessary.
1334                  */
1335         }
1336         return (NULL);
1337 }
1338
1339 static const char *
1340 lookup_uname(struct cpio *cpio, uid_t uid)
1341 {
1342         return (lookup_name(cpio, &cpio->uname_cache,
1343                     &lookup_uname_helper, (id_t)uid));
1344 }
1345
1346 static int
1347 lookup_uname_helper(struct cpio *cpio, const char **name, id_t id)
1348 {
1349         struct passwd   *pwent;
1350
1351         (void)cpio; /* UNUSED */
1352
1353         errno = 0;
1354         pwent = getpwuid((uid_t)id);
1355         if (pwent == NULL) {
1356                 *name = NULL;
1357                 if (errno != 0 && errno != ENOENT)
1358                         lafe_warnc(errno, "getpwuid(%s) failed",
1359                             cpio_i64toa((int64_t)id));
1360                 return (errno);
1361         }
1362
1363         *name = pwent->pw_name;
1364         return (0);
1365 }
1366
1367 static const char *
1368 lookup_gname(struct cpio *cpio, gid_t gid)
1369 {
1370         return (lookup_name(cpio, &cpio->gname_cache,
1371                     &lookup_gname_helper, (id_t)gid));
1372 }
1373
1374 static int
1375 lookup_gname_helper(struct cpio *cpio, const char **name, id_t id)
1376 {
1377         struct group    *grent;
1378
1379         (void)cpio; /* UNUSED */
1380
1381         errno = 0;
1382         grent = getgrgid((gid_t)id);
1383         if (grent == NULL) {
1384                 *name = NULL;
1385                 if (errno != 0)
1386                         lafe_warnc(errno, "getgrgid(%s) failed",
1387                             cpio_i64toa((int64_t)id));
1388                 return (errno);
1389         }
1390
1391         *name = grent->gr_name;
1392         return (0);
1393 }
1394
1395 /*
1396  * It would be nice to just use printf() for formatting large numbers,
1397  * but the compatibility problems are a big headache.  Hence the
1398  * following simple utility function.
1399  */
1400 const char *
1401 cpio_i64toa(int64_t n0)
1402 {
1403         /* 2^64 =~ 1.8 * 10^19, so 20 decimal digits suffice.
1404          * We also need 1 byte for '-' and 1 for '\0'.
1405          */
1406         static char buff[22];
1407         int64_t n = n0 < 0 ? -n0 : n0;
1408         char *p = buff + sizeof(buff);
1409
1410         *--p = '\0';
1411         do {
1412                 *--p = '0' + (int)(n % 10);
1413                 n /= 10;
1414         } while (n > 0);
1415         if (n0 < 0)
1416                 *--p = '-';
1417         return p;
1418 }