2 * Copyright (c) 2003-2007 Tim Kientzle
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
28 #include "cpio_platform.h"
29 __FBSDID("$FreeBSD: src/usr.bin/cpio/cpio.c,v 1.4 2008/06/24 15:18:40 kientzle Exp $");
31 #include <sys/types.h>
33 #include <archive_entry.h>
35 #ifdef HAVE_SYS_STAT_H
61 static int copy_data(struct archive *, struct archive *);
62 static const char *cpio_rename(const char *name);
63 static int entry_to_archive(struct cpio *, struct archive_entry *);
64 static int file_to_archive(struct cpio *, const char *);
65 static void long_help(void);
66 static void mode_in(struct cpio *);
67 static void mode_list(struct cpio *);
68 static void mode_out(struct cpio *);
69 static void mode_pass(struct cpio *, const char *);
70 static void restore_time(struct cpio *, struct archive_entry *,
71 const char *, int fd);
72 static void usage(void);
73 static void version(void);
76 main(int argc, char *argv[])
78 static char buff[16384];
79 struct cpio _cpio; /* Allocated on stack. */
85 memset(cpio, 0, sizeof(*cpio));
87 cpio->buff_size = sizeof(buff);
89 /* Need cpio_progname before calling cpio_warnc. */
91 cpio_progname = "bsdcpio";
93 cpio_progname = strrchr(*argv, '/');
94 if (cpio_progname != NULL)
97 cpio_progname = *argv;
100 cpio->uid_override = -1;
101 cpio->gid_override = -1;
104 cpio->line_separator = '\n';
107 cpio->compress = '\0';
108 /* TODO: Implement old binary format in libarchive, use that here. */
109 cpio->format = "odc"; /* Default format */
110 cpio->extract_flags = ARCHIVE_EXTRACT_NO_AUTODIR;
111 cpio->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
112 cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_SYMLINKS;
113 cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_NODOTDOT;
114 /* TODO: If run by root, set owner as well. */
115 cpio->bytes_per_block = 512;
116 cpio->filename = NULL;
118 while ((opt = cpio_getopt(cpio)) != -1) {
120 case '0': /* GNU convention: --null, -0 */
121 cpio->line_separator = '\0';
123 case 'A': /* NetBSD/OpenBSD */
124 cpio->option_append = 1;
126 case 'a': /* POSIX 1997 */
127 cpio->option_atime_restore = 1;
129 case 'B': /* POSIX 1997 */
130 cpio->bytes_per_block = 5120;
132 case 'C': /* NetBSD/OpenBSD */
133 cpio->bytes_per_block = atoi(optarg);
134 if (cpio->bytes_per_block <= 0)
135 cpio_errc(1, 0, "Invalid blocksize %s", optarg);
137 case 'c': /* POSIX 1997 */
138 cpio->format = "odc";
140 case 'd': /* POSIX 1997 */
141 cpio->extract_flags &= ~ARCHIVE_EXTRACT_NO_AUTODIR;
143 case 'E': /* NetBSD/OpenBSD */
144 include_from_file(cpio, optarg);
146 case 'F': /* NetBSD/OpenBSD/GNU cpio */
147 cpio->filename = optarg;
149 case 'f': /* POSIX 1997 */
150 exclude(cpio, optarg);
152 case 'H': /* GNU cpio (also --format) */
153 cpio->format = optarg;
158 case 'I': /* NetBSD/OpenBSD */
159 cpio->filename = optarg;
161 case 'i': /* POSIX 1997 */
164 case OPTION_INSECURE:
165 cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_SYMLINKS;
166 cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT;
168 case 'L': /* GNU cpio */
169 cpio->option_follow_links = 1;
171 case 'l': /* POSIX 1997 */
172 cpio->option_link = 1;
174 case 'm': /* POSIX 1997 */
175 cpio->extract_flags |= ARCHIVE_EXTRACT_TIME;
177 case 'O': /* GNU cpio */
178 cpio->filename = optarg;
180 case 'o': /* POSIX 1997 */
183 case 'p': /* POSIX 1997 */
185 cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT;
187 case OPTION_QUIET: /* GNU cpio */
190 case 'R': /* GNU cpio, also --owner */
191 if (owner_parse(optarg, &uid, &gid))
194 cpio->uid_override = uid;
196 cpio->gid_override = gid;
198 case 'r': /* POSIX 1997 */
199 cpio->option_rename = 1;
201 case 't': /* POSIX 1997 */
202 cpio->option_list = 1;
204 case 'u': /* POSIX 1997 */
206 &= ~ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
208 case 'v': /* POSIX 1997 */
211 case OPTION_VERSION: /* GNU convention */
216 * cpio_getopt() handles -W specially, so it's not
219 case 'W': /* Obscure, but useful GNU convention. */
222 case 'y': /* tar convention */
223 cpio->compress = opt;
225 case 'Z': /* tar convention */
226 cpio->compress = opt;
228 case 'z': /* tar convention */
229 cpio->compress = opt;
236 /* TODO: Sanity-check args, error out on nonsensical combinations. */
238 cpio->argc -= optind;
239 cpio->argv += optind;
241 switch (cpio->mode) {
246 while (*cpio->argv != NULL) {
247 include(cpio, *cpio->argv);
251 if (cpio->option_list)
257 if (*cpio->argv == NULL || **cpio->argv == '\0')
259 "-p mode requires a target directory");
260 mode_pass(cpio, *cpio->argv);
264 "Must specify at least one of -i, -o, or -p");
277 fprintf(stderr, "Brief Usage:\n");
278 fprintf(stderr, " List: %s -it < archive\n", p);
279 fprintf(stderr, " Extract: %s -i < archive\n", p);
280 fprintf(stderr, " Create: %s -o < filenames > archive\n", p);
281 #ifdef HAVE_GETOPT_LONG
282 fprintf(stderr, " Help: %s --help\n", p);
284 fprintf(stderr, " Help: %s -h\n", p);
289 static const char *long_help_msg =
290 "First option must be a mode specifier:\n"
291 " -i Input -o Output -p Pass\n"
294 "Create: %p -o [options] < [list of files] > [archive]\n"
295 " -z, -y Compress archive with gzip/bzip2\n"
296 " --format {odc|newc|ustar} Select archive format\n"
297 "List: %p -it < [archive]\n"
298 "Extract: %p -i [options] < [archive]\n";
302 * Note that the word 'bsdcpio' will always appear in the first line
305 * In particular, /bin/sh scripts that need to test for the presence
306 * of bsdcpio can use the following template:
308 * if (cpio --help 2>&1 | grep bsdcpio >/dev/null 2>&1 ) then \
309 * echo bsdcpio; else echo not bsdcpio; fi
317 prog = cpio_progname;
321 p = (strcmp(prog,"bsdcpio") != 0) ? "(bsdcpio)" : "";
322 printf("%s%s: manipulate archive files\n", prog, p);
324 for (p = long_help_msg; *p != '\0'; p++) {
340 fprintf(stdout,"bsdcpio %s -- %s\n",
341 BSDCPIO_VERSION_STRING,
347 mode_out(struct cpio *cpio)
349 unsigned long blocks;
350 struct archive_entry *entry, *spare;
351 struct line_reader *lr;
355 if (cpio->option_append)
356 cpio_errc(1, 0, "Append mode not yet supported.");
357 cpio->archive = archive_write_new();
358 if (cpio->archive == NULL)
359 cpio_errc(1, 0, "Failed to allocate archive object");
360 switch (cpio->compress) {
362 archive_write_set_compression_bzip2(cpio->archive);
365 archive_write_set_compression_gzip(cpio->archive);
368 archive_write_set_compression_compress(cpio->archive);
371 archive_write_set_compression_none(cpio->archive);
374 r = archive_write_set_format_by_name(cpio->archive, cpio->format);
376 cpio_errc(1, 0, archive_error_string(cpio->archive));
377 archive_write_set_bytes_per_block(cpio->archive, cpio->bytes_per_block);
378 cpio->linkresolver = archive_entry_linkresolver_new();
379 archive_entry_linkresolver_set_strategy(cpio->linkresolver,
380 archive_format(cpio->archive));
382 r = archive_write_open_file(cpio->archive, cpio->filename);
384 cpio_errc(1, 0, archive_error_string(cpio->archive));
385 lr = process_lines_init("-", cpio->line_separator);
386 while ((p = process_lines_next(lr)) != NULL)
387 file_to_archive(cpio, p);
388 process_lines_free(lr);
391 * The hardlink detection may have queued up a couple of entries
392 * that can now be flushed.
395 archive_entry_linkify(cpio->linkresolver, &entry, &spare);
396 while (entry != NULL) {
397 entry_to_archive(cpio, entry);
398 archive_entry_free(entry);
400 archive_entry_linkify(cpio->linkresolver, &entry, &spare);
403 r = archive_write_close(cpio->archive);
405 cpio_errc(1, 0, archive_error_string(cpio->archive));
408 blocks = (archive_position_uncompressed(cpio->archive) + 511)
410 fprintf(stderr, "%lu %s\n", blocks,
411 blocks == 1 ? "block" : "blocks");
413 archive_write_finish(cpio->archive);
417 * This is used by both out mode (to copy objects from disk into
418 * an archive) and pass mode (to copy objects from disk to
419 * an archive_write_disk "archive").
422 file_to_archive(struct cpio *cpio, const char *srcpath)
425 const char *destpath;
426 struct archive_entry *entry, *spare;
433 * Create an archive_entry describing the source file.
435 entry = archive_entry_new();
437 cpio_errc(1, 0, "Couldn't allocate entry");
438 archive_entry_copy_sourcepath(entry, srcpath);
440 /* Get stat information. */
441 if (cpio->option_follow_links)
442 r = stat(srcpath, &st);
444 r = lstat(srcpath, &st);
446 cpio_warnc(errno, "Couldn't stat \"%s\"", srcpath);
447 archive_entry_free(entry);
451 if (cpio->uid_override >= 0)
452 st.st_uid = cpio->uid_override;
453 if (cpio->gid_override >= 0)
454 st.st_gid = cpio->uid_override;
455 archive_entry_copy_stat(entry, &st);
457 /* If its a symlink, pull the target. */
458 if (S_ISLNK(st.st_mode)) {
459 lnklen = readlink(srcpath, cpio->buff, cpio->buff_size);
462 "%s: Couldn't read symbolic link", srcpath);
463 archive_entry_free(entry);
466 cpio->buff[lnklen] = 0;
467 archive_entry_set_symlink(entry, cpio->buff);
471 * Generate a destination path for this entry.
472 * "destination path" is the name to which it will be copied in
473 * pass mode or the name that will go into the archive in
478 len = strlen(cpio->destdir) + strlen(srcpath) + 8;
479 if (len >= cpio->pass_destpath_alloc) {
480 while (len >= cpio->pass_destpath_alloc) {
481 cpio->pass_destpath_alloc += 512;
482 cpio->pass_destpath_alloc *= 2;
484 free(cpio->pass_destpath);
485 cpio->pass_destpath = malloc(cpio->pass_destpath_alloc);
486 if (cpio->pass_destpath == NULL)
488 "Can't allocate path buffer");
490 strcpy(cpio->pass_destpath, cpio->destdir);
494 strcat(cpio->pass_destpath, p);
495 destpath = cpio->pass_destpath;
497 if (cpio->option_rename)
498 destpath = cpio_rename(destpath);
499 if (destpath == NULL)
501 archive_entry_copy_pathname(entry, destpath);
504 * If we're trying to preserve hardlinks, match them here.
507 if (cpio->linkresolver != NULL
508 && !S_ISDIR(st.st_mode)) {
509 archive_entry_linkify(cpio->linkresolver, &entry, &spare);
513 r = entry_to_archive(cpio, entry);
514 archive_entry_free(entry);
518 r = entry_to_archive(cpio, spare);
519 archive_entry_free(spare);
525 entry_to_archive(struct cpio *cpio, struct archive_entry *entry)
527 const char *destpath = archive_entry_pathname(entry);
528 const char *srcpath = archive_entry_sourcepath(entry);
533 /* Print out the destination name to the user. */
535 fprintf(stderr,"%s", destpath);
538 * Option_link only makes sense in pass mode and for
539 * regular files. Also note: if a link operation fails
540 * because of cross-device restrictions, we'll fall back
541 * to copy mode for that entry.
543 * TODO: Test other cpio implementations to see if they
544 * hard-link anything other than regular files here.
546 if (cpio->option_link
547 && archive_entry_filetype(entry) == AE_IFREG)
549 struct archive_entry *t;
550 /* Save the original entry in case we need it later. */
551 t = archive_entry_clone(entry);
553 cpio_errc(1, ENOMEM, "Can't create link");
554 /* Note: link(2) doesn't create parent directories,
555 * so we use archive_write_header() instead as a
557 archive_entry_set_hardlink(t, srcpath);
558 /* This is a straight link that carries no data. */
559 archive_entry_set_size(t, 0);
560 r = archive_write_header(cpio->archive, t);
561 archive_entry_free(t);
563 cpio_warnc(archive_errno(cpio->archive),
564 archive_error_string(cpio->archive));
565 if (r == ARCHIVE_FATAL)
568 if (r != ARCHIVE_OK && archive_errno(cpio->archive) == EXDEV) {
569 /* Cross-device link: Just fall through and use
570 * the original entry to copy the file over. */
571 cpio_warnc(0, "Copying file instead");
578 * Make sure we can open the file (if necessary) before
579 * trying to write the header.
581 if (archive_entry_filetype(entry) == AE_IFREG) {
582 if (archive_entry_size(entry) > 0) {
583 fd = open(srcpath, O_RDONLY);
586 "%s: could not open file", srcpath);
591 archive_entry_set_size(entry, 0);
594 r = archive_write_header(cpio->archive, entry);
597 cpio_warnc(archive_errno(cpio->archive),
600 archive_error_string(cpio->archive));
602 if (r == ARCHIVE_FATAL)
605 if (r >= ARCHIVE_WARN && fd >= 0) {
606 bytes_read = read(fd, cpio->buff, cpio->buff_size);
607 while (bytes_read > 0) {
608 r = archive_write_data(cpio->archive,
609 cpio->buff, bytes_read);
611 cpio_errc(1, archive_errno(cpio->archive),
612 archive_error_string(cpio->archive));
613 if (r < bytes_read) {
615 "Truncated write; file may have grown while being archived.");
617 bytes_read = read(fd, cpio->buff, cpio->buff_size);
621 restore_time(cpio, entry, srcpath, fd);
625 fprintf(stderr,"\n");
632 restore_time(struct cpio *cpio, struct archive_entry *entry,
633 const char *name, int fd)
636 static int warned = 0;
638 (void)cpio; /* UNUSED */
639 (void)entry; /* UNUSED */
640 (void)name; /* UNUSED */
641 (void)fd; /* UNUSED */
644 cpio_warnc(0, "Can't restore access times on this platform");
648 struct timeval times[2];
650 if (!cpio->option_atime_restore)
653 times[1].tv_sec = archive_entry_mtime(entry);
654 times[1].tv_usec = archive_entry_mtime_nsec(entry) / 1000;
656 times[0].tv_sec = archive_entry_atime(entry);
657 times[0].tv_usec = archive_entry_atime_nsec(entry) / 1000;
660 if (fd >= 0 && futimes(fd, times) == 0)
665 if (lutimes(name, times) != 0)
667 if (!S_ISLNK(archive_entry_mode(entry)) && utimes(name, times) != 0)
669 cpio_warnc(errno, "Can't update time for %s", name);
675 mode_in(struct cpio *cpio)
678 struct archive_entry *entry;
680 const char *destpath;
681 unsigned long blocks;
684 ext = archive_write_disk_new();
686 cpio_errc(1, 0, "Couldn't allocate restore object");
687 r = archive_write_disk_set_options(ext, cpio->extract_flags);
689 cpio_errc(1, 0, archive_error_string(ext));
690 a = archive_read_new();
692 cpio_errc(1, 0, "Couldn't allocate archive object");
693 archive_read_support_compression_all(a);
694 archive_read_support_format_all(a);
696 if (archive_read_open_file(a, cpio->filename, cpio->bytes_per_block))
697 cpio_errc(1, archive_errno(a),
698 archive_error_string(a));
700 r = archive_read_next_header(a, &entry);
701 if (r == ARCHIVE_EOF)
703 if (r != ARCHIVE_OK) {
704 cpio_errc(1, archive_errno(a),
705 archive_error_string(a));
707 if (excluded(cpio, archive_entry_pathname(entry)))
709 if (cpio->option_rename) {
710 destpath = cpio_rename(archive_entry_pathname(entry));
711 archive_entry_set_pathname(entry, destpath);
713 destpath = archive_entry_pathname(entry);
714 if (destpath == NULL)
717 fprintf(stdout, "%s\n", destpath);
718 if (cpio->uid_override >= 0)
719 archive_entry_set_uid(entry, cpio->uid_override);
720 if (cpio->gid_override >= 0)
721 archive_entry_set_gid(entry, cpio->gid_override);
722 r = archive_write_header(ext, entry);
723 if (r != ARCHIVE_OK) {
724 fprintf(stderr, "%s: %s\n",
725 archive_entry_pathname(entry),
726 archive_error_string(ext));
727 } else if (archive_entry_size(entry) > 0) {
728 r = copy_data(a, ext);
731 r = archive_read_close(a);
733 cpio_errc(1, 0, archive_error_string(a));
734 r = archive_write_close(ext);
736 cpio_errc(1, 0, archive_error_string(ext));
738 blocks = (archive_position_uncompressed(a) + 511)
740 fprintf(stderr, "%lu %s\n", blocks,
741 blocks == 1 ? "block" : "blocks");
743 archive_read_finish(a);
744 archive_write_finish(ext);
749 copy_data(struct archive *ar, struct archive *aw)
757 r = archive_read_data_block(ar, &block, &size, &offset);
758 if (r == ARCHIVE_EOF)
760 if (r != ARCHIVE_OK) {
761 cpio_warnc(archive_errno(ar),
762 "%s", archive_error_string(ar));
765 r = archive_write_data_block(aw, block, size, offset);
766 if (r != ARCHIVE_OK) {
767 cpio_warnc(archive_errno(aw),
768 archive_error_string(aw));
775 mode_list(struct cpio *cpio)
778 struct archive_entry *entry;
779 unsigned long blocks;
782 a = archive_read_new();
784 cpio_errc(1, 0, "Couldn't allocate archive object");
785 archive_read_support_compression_all(a);
786 archive_read_support_format_all(a);
788 if (archive_read_open_file(a, cpio->filename, cpio->bytes_per_block))
789 cpio_errc(1, archive_errno(a),
790 archive_error_string(a));
792 r = archive_read_next_header(a, &entry);
793 if (r == ARCHIVE_EOF)
795 if (r != ARCHIVE_OK) {
796 cpio_errc(1, archive_errno(a),
797 archive_error_string(a));
799 if (excluded(cpio, archive_entry_pathname(entry)))
802 /* TODO: uname/gname lookups */
803 /* TODO: Clean this up. */
805 "%s%3d %8s%8s " CPIO_FILESIZE_PRINTF " %s\n",
806 archive_entry_strmode(entry),
807 archive_entry_nlink(entry),
808 archive_entry_uname(entry),
809 archive_entry_gname(entry),
810 (CPIO_FILESIZE_TYPE)archive_entry_size(entry),
811 archive_entry_pathname(entry));
813 fprintf(stdout, "%s\n", archive_entry_pathname(entry));
815 r = archive_read_close(a);
817 cpio_errc(1, 0, archive_error_string(a));
819 blocks = (archive_position_uncompressed(a) + 511)
821 fprintf(stderr, "%lu %s\n", blocks,
822 blocks == 1 ? "block" : "blocks");
824 archive_read_finish(a);
829 mode_pass(struct cpio *cpio, const char *destdir)
831 struct line_reader *lr;
835 /* Ensure target dir has a trailing '/' to simplify path surgery. */
836 cpio->destdir = malloc(strlen(destdir) + 8);
837 strcpy(cpio->destdir, destdir);
838 if (destdir[strlen(destdir) - 1] != '/')
839 strcat(cpio->destdir, "/");
841 cpio->archive = archive_write_disk_new();
842 if (cpio->archive == NULL)
843 cpio_errc(1, 0, "Failed to allocate archive object");
844 r = archive_write_disk_set_options(cpio->archive, cpio->extract_flags);
846 cpio_errc(1, 0, archive_error_string(cpio->archive));
847 cpio->linkresolver = archive_entry_linkresolver_new();
848 archive_write_disk_set_standard_lookup(cpio->archive);
849 lr = process_lines_init("-", cpio->line_separator);
850 while ((p = process_lines_next(lr)) != NULL)
851 file_to_archive(cpio, p);
852 process_lines_free(lr);
854 archive_entry_linkresolver_free(cpio->linkresolver);
855 r = archive_write_close(cpio->archive);
857 cpio_errc(1, 0, archive_error_string(cpio->archive));
858 archive_write_finish(cpio->archive);
862 * Prompt for a new name for this entry. Returns a pointer to the
863 * new name or NULL if the entry should not be copied. This
864 * implements the semantics defined in POSIX.1-1996, which specifies
865 * that an input of '.' means the name should be unchanged. GNU cpio
866 * treats '.' as a literal new name.
869 cpio_rename(const char *name)
871 static char buff[1024];
875 t = fopen("/dev/tty", "r+");
878 fprintf(t, "%s (Enter/./(new name))? ", name);
881 p = fgets(buff, sizeof(buff), t);
884 /* End-of-file is a blank line. */
887 while (*p == ' ' || *p == '\t')
889 if (*p == '\n' || *p == '\0')
892 if (*p == '.' && p[1] == '\n')
893 /* Single period preserves original name. */
896 /* Trim the final newline. */
897 while (*p != '\0' && *p != '\n')
899 /* Overwrite the final \n with a null character. */
906 * Read lines from file and do something with each one. If option_null
907 * is set, lines are terminated with zero bytes; otherwise, they're
908 * terminated with newlines.
910 * This uses a self-sizing buffer to handle arbitrarily-long lines.
914 char *buff, *buff_end, *line_start, *line_end, *p;
922 process_lines_init(const char *pathname, char separator)
924 struct line_reader *lr;
926 lr = calloc(1, sizeof(*lr));
928 cpio_errc(1, ENOMEM, "Can't open %s", pathname);
930 lr->separator = separator;
931 lr->pathname = strdup(pathname);
933 if (strcmp(pathname, "-") == 0)
936 lr->f = fopen(pathname, "r");
938 cpio_errc(1, errno, "Couldn't open %s", pathname);
939 lr->buff_length = 8192;
940 lr->buff = malloc(lr->buff_length);
941 if (lr->buff == NULL)
942 cpio_errc(1, ENOMEM, "Can't read %s", pathname);
943 lr->line_start = lr->line_end = lr->buff_end = lr->buff;
949 process_lines_next(struct line_reader *lr)
951 size_t bytes_wanted, bytes_read, new_buff_size;
952 char *line_start, *p;
955 /* If there's a line in the buffer, return it immediately. */
956 while (lr->line_end < lr->buff_end) {
957 if (*lr->line_end == lr->separator) {
958 *lr->line_end = '\0';
959 line_start = lr->line_start;
960 lr->line_start = lr->line_end + 1;
961 lr->line_end = lr->line_start;
967 /* If we're at end-of-file, process the final data. */
969 /* If there's more text, return one last line. */
970 if (lr->line_end > lr->line_start) {
971 *lr->line_end = '\0';
972 line_start = lr->line_start;
973 lr->line_start = lr->line_end + 1;
974 lr->line_end = lr->line_start;
977 /* Otherwise, we're done. */
981 /* Buffer only has part of a line. */
982 if (lr->line_start > lr->buff) {
983 /* Move a leftover fractional line to the beginning. */
984 memmove(lr->buff, lr->line_start,
985 lr->buff_end - lr->line_start);
986 lr->buff_end -= lr->line_start - lr->buff;
987 lr->line_end -= lr->line_start - lr->buff;
988 lr->line_start = lr->buff;
990 /* Line is too big; enlarge the buffer. */
991 new_buff_size = lr->buff_length * 2;
992 if (new_buff_size <= lr->buff_length)
994 "Line too long in %s", lr->pathname);
995 lr->buff_length = new_buff_size;
996 p = realloc(lr->buff, new_buff_size);
999 "Line too long in %s", lr->pathname);
1000 lr->buff_end = p + (lr->buff_end - lr->buff);
1001 lr->line_end = p + (lr->line_end - lr->buff);
1002 lr->line_start = lr->buff = p;
1005 /* Get some more data into the buffer. */
1006 bytes_wanted = lr->buff + lr->buff_length - lr->buff_end;
1007 bytes_read = fread(lr->buff_end, 1, bytes_wanted, lr->f);
1008 lr->buff_end += bytes_read;
1011 cpio_errc(1, errno, "Can't read %s", lr->pathname);
1021 process_lines_free(struct line_reader *lr)