Ported "cp" from NetBSD to toolbox.
Bug: 6798417
Change-Id: I716ab459b9edf4c7405bf042adbee0300b6f51c9
diff --git a/toolbox/cp/cp.c b/toolbox/cp/cp.c
new file mode 100644
index 0000000..bd3c70e
--- /dev/null
+++ b/toolbox/cp/cp.c
@@ -0,0 +1,552 @@
+/* $NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 christos Exp $ */
+
+/*
+ * Copyright (c) 1988, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * David Hitz of Auspex Systems Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT(
+"@(#) Copyright (c) 1988, 1993, 1994\
+ The Regents of the University of California. All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95";
+#else
+__RCSID("$NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 christos Exp $");
+#endif
+#endif /* not lint */
+
+/*
+ * Cp copies source files to target files.
+ *
+ * The global PATH_T structure "to" always contains the path to the
+ * current target file. Since fts(3) does not change directories,
+ * this path can be either absolute or dot-relative.
+ *
+ * The basic algorithm is to initialize "to" and use fts(3) to traverse
+ * the file hierarchy rooted in the argument list. A trivial case is the
+ * case of 'cp file1 file2'. The more interesting case is the case of
+ * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
+ * path (relative to the root of the traversal) is appended to dir (stored
+ * in "to") to form the final target path.
+ */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <assert.h>
+#include <err.h>
+#include <errno.h>
+#include <fts.h>
+#include <locale.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "extern.h"
+
+#define STRIP_TRAILING_SLASH(p) { \
+ while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \
+ *--(p).p_end = '\0'; \
+}
+
+static char empty[] = "";
+PATH_T to = { .p_end = to.p_path, .target_end = empty };
+
+uid_t myuid;
+int Hflag, Lflag, Rflag, Pflag, fflag, iflag, lflag, pflag, rflag, vflag, Nflag;
+mode_t myumask;
+sig_atomic_t pinfo;
+
+enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
+
+static int copy(char *[], enum op, int);
+
+static void
+progress(int sig __unused)
+{
+
+ pinfo++;
+}
+
+int
+cp_main(int argc, char *argv[])
+{
+ struct stat to_stat, tmp_stat;
+ enum op type;
+ int ch, fts_options, r, have_trailing_slash;
+ char *target, **src;
+
+#ifndef ANDROID
+ setprogname(argv[0]);
+#endif
+ (void)setlocale(LC_ALL, "");
+
+ Hflag = Lflag = Pflag = Rflag = 0;
+ while ((ch = getopt(argc, argv, "HLNPRfailprv")) != -1)
+ switch (ch) {
+ case 'H':
+ Hflag = 1;
+ Lflag = Pflag = 0;
+ break;
+ case 'L':
+ Lflag = 1;
+ Hflag = Pflag = 0;
+ break;
+ case 'N':
+ Nflag = 1;
+ break;
+ case 'P':
+ Pflag = 1;
+ Hflag = Lflag = 0;
+ break;
+ case 'R':
+ Rflag = 1;
+ break;
+ case 'a':
+ Pflag = 1;
+ pflag = 1;
+ Rflag = 1;
+ Hflag = Lflag = 0;
+ break;
+ case 'f':
+ fflag = 1;
+ iflag = 0;
+ break;
+ case 'i':
+ iflag = isatty(fileno(stdin));
+ fflag = 0;
+ break;
+ case 'l':
+ lflag = 1;
+ break;
+ case 'p':
+ pflag = 1;
+ break;
+ case 'r':
+ rflag = 1;
+ break;
+ case 'v':
+ vflag = 1;
+ break;
+ case '?':
+ default:
+ cp_usage();
+ /* NOTREACHED */
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (argc < 2)
+ cp_usage();
+
+ fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
+ if (rflag) {
+ if (Rflag) {
+ errx(EXIT_FAILURE,
+ "the -R and -r options may not be specified together.");
+ /* NOTREACHED */
+ }
+ if (Hflag || Lflag || Pflag) {
+ errx(EXIT_FAILURE,
+ "the -H, -L, and -P options may not be specified with the -r option.");
+ /* NOTREACHED */
+ }
+ fts_options &= ~FTS_PHYSICAL;
+ fts_options |= FTS_LOGICAL;
+ }
+
+ if (Rflag) {
+ if (Hflag)
+ fts_options |= FTS_COMFOLLOW;
+ if (Lflag) {
+ fts_options &= ~FTS_PHYSICAL;
+ fts_options |= FTS_LOGICAL;
+ }
+ } else if (!Pflag) {
+ fts_options &= ~FTS_PHYSICAL;
+ fts_options |= FTS_LOGICAL | FTS_COMFOLLOW;
+ }
+
+ myuid = getuid();
+
+ /* Copy the umask for explicit mode setting. */
+ myumask = umask(0);
+ (void)umask(myumask);
+
+ /* Save the target base in "to". */
+ target = argv[--argc];
+ if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path))
+ errx(EXIT_FAILURE, "%s: name too long", target);
+ to.p_end = to.p_path + strlen(to.p_path);
+ have_trailing_slash = (to.p_end[-1] == '/');
+ if (have_trailing_slash)
+ STRIP_TRAILING_SLASH(to);
+ to.target_end = to.p_end;
+
+ /* Set end of argument list for fts(3). */
+ argv[argc] = NULL;
+
+#ifndef ANDROID
+ (void)signal(SIGINFO, progress);
+#endif
+
+ /*
+ * Cp has two distinct cases:
+ *
+ * cp [-R] source target
+ * cp [-R] source1 ... sourceN directory
+ *
+ * In both cases, source can be either a file or a directory.
+ *
+ * In (1), the target becomes a copy of the source. That is, if the
+ * source is a file, the target will be a file, and likewise for
+ * directories.
+ *
+ * In (2), the real target is not directory, but "directory/source".
+ */
+ if (Pflag)
+ r = lstat(to.p_path, &to_stat);
+ else
+ r = stat(to.p_path, &to_stat);
+ if (r == -1 && errno != ENOENT) {
+ err(EXIT_FAILURE, "%s", to.p_path);
+ /* NOTREACHED */
+ }
+ if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
+ /*
+ * Case (1). Target is not a directory.
+ */
+ if (argc > 1)
+ cp_usage();
+ /*
+ * Need to detect the case:
+ * cp -R dir foo
+ * Where dir is a directory and foo does not exist, where
+ * we want pathname concatenations turned on but not for
+ * the initial mkdir().
+ */
+ if (r == -1) {
+ if (rflag || (Rflag && (Lflag || Hflag)))
+ r = stat(*argv, &tmp_stat);
+ else
+ r = lstat(*argv, &tmp_stat);
+ if (r == -1) {
+ err(EXIT_FAILURE, "%s", *argv);
+ /* NOTREACHED */
+ }
+
+ if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag))
+ type = DIR_TO_DNE;
+ else
+ type = FILE_TO_FILE;
+ } else
+ type = FILE_TO_FILE;
+
+ if (have_trailing_slash && type == FILE_TO_FILE) {
+ if (r == -1)
+ errx(1, "directory %s does not exist",
+ to.p_path);
+ else
+ errx(1, "%s is not a directory", to.p_path);
+ }
+ } else {
+ /*
+ * Case (2). Target is a directory.
+ */
+ type = FILE_TO_DIR;
+ }
+
+ /*
+ * make "cp -rp src/ dst" behave like "cp -rp src dst" not
+ * like "cp -rp src/. dst"
+ */
+ for (src = argv; *src; src++) {
+ size_t len = strlen(*src);
+ while (len-- > 1 && (*src)[len] == '/')
+ (*src)[len] = '\0';
+ }
+
+ exit(copy(argv, type, fts_options));
+ /* NOTREACHED */
+}
+
+static int dnestack[MAXPATHLEN]; /* unlikely we'll have more nested dirs */
+static ssize_t dnesp;
+static void
+pushdne(int dne)
+{
+
+ dnestack[dnesp++] = dne;
+ assert(dnesp < MAXPATHLEN);
+}
+
+static int
+popdne(void)
+{
+ int rv;
+
+ rv = dnestack[--dnesp];
+ assert(dnesp >= 0);
+ return rv;
+}
+
+static int
+copy(char *argv[], enum op type, int fts_options)
+{
+ struct stat to_stat;
+ FTS *ftsp;
+ FTSENT *curr;
+ int base, dne, sval;
+ int this_failed, any_failed;
+ size_t nlen;
+ char *p, *target_mid;
+
+ base = 0; /* XXX gcc -Wuninitialized (see comment below) */
+
+ if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL)
+ err(EXIT_FAILURE, "%s", argv[0]);
+ /* NOTREACHED */
+ for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) {
+ this_failed = 0;
+ switch (curr->fts_info) {
+ case FTS_NS:
+ case FTS_DNR:
+ case FTS_ERR:
+ warnx("%s: %s", curr->fts_path,
+ strerror(curr->fts_errno));
+ this_failed = any_failed = 1;
+ continue;
+ case FTS_DC: /* Warn, continue. */
+ warnx("%s: directory causes a cycle", curr->fts_path);
+ this_failed = any_failed = 1;
+ continue;
+ }
+
+ /*
+ * If we are in case (2) or (3) above, we need to append the
+ * source name to the target name.
+ */
+ if (type != FILE_TO_FILE) {
+ if ((curr->fts_namelen +
+ to.target_end - to.p_path + 1) > MAXPATHLEN) {
+ warnx("%s/%s: name too long (not copied)",
+ to.p_path, curr->fts_name);
+ this_failed = any_failed = 1;
+ continue;
+ }
+
+ /*
+ * Need to remember the roots of traversals to create
+ * correct pathnames. If there's a directory being
+ * copied to a non-existent directory, e.g.
+ * cp -R a/dir noexist
+ * the resulting path name should be noexist/foo, not
+ * noexist/dir/foo (where foo is a file in dir), which
+ * is the case where the target exists.
+ *
+ * Also, check for "..". This is for correct path
+ * concatentation for paths ending in "..", e.g.
+ * cp -R .. /tmp
+ * Paths ending in ".." are changed to ".". This is
+ * tricky, but seems the easiest way to fix the problem.
+ *
+ * XXX
+ * Since the first level MUST be FTS_ROOTLEVEL, base
+ * is always initialized.
+ */
+ if (curr->fts_level == FTS_ROOTLEVEL) {
+ if (type != DIR_TO_DNE) {
+ p = strrchr(curr->fts_path, '/');
+ base = (p == NULL) ? 0 :
+ (int)(p - curr->fts_path + 1);
+
+ if (!strcmp(&curr->fts_path[base],
+ ".."))
+ base += 1;
+ } else
+ base = curr->fts_pathlen;
+ }
+
+ p = &curr->fts_path[base];
+ nlen = curr->fts_pathlen - base;
+ target_mid = to.target_end;
+ if (*p != '/' && target_mid[-1] != '/')
+ *target_mid++ = '/';
+ *target_mid = 0;
+
+ if (target_mid - to.p_path + nlen >= PATH_MAX) {
+ warnx("%s%s: name too long (not copied)",
+ to.p_path, p);
+ this_failed = any_failed = 1;
+ continue;
+ }
+ (void)strncat(target_mid, p, nlen);
+ to.p_end = target_mid + nlen;
+ *to.p_end = 0;
+ STRIP_TRAILING_SLASH(to);
+ }
+
+ sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat);
+ /* Not an error but need to remember it happened */
+ if (sval == -1)
+ dne = 1;
+ else {
+ if (to_stat.st_dev == curr->fts_statp->st_dev &&
+ to_stat.st_ino == curr->fts_statp->st_ino) {
+ warnx("%s and %s are identical (not copied).",
+ to.p_path, curr->fts_path);
+ this_failed = any_failed = 1;
+ if (S_ISDIR(curr->fts_statp->st_mode))
+ (void)fts_set(ftsp, curr, FTS_SKIP);
+ continue;
+ }
+ if (!S_ISDIR(curr->fts_statp->st_mode) &&
+ S_ISDIR(to_stat.st_mode)) {
+ warnx("cannot overwrite directory %s with non-directory %s",
+ to.p_path, curr->fts_path);
+ this_failed = any_failed = 1;
+ continue;
+ }
+ dne = 0;
+ }
+
+ switch (curr->fts_statp->st_mode & S_IFMT) {
+ case S_IFLNK:
+ /* Catch special case of a non dangling symlink */
+ if((fts_options & FTS_LOGICAL) ||
+ ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) {
+ if (copy_file(curr, dne))
+ this_failed = any_failed = 1;
+ } else {
+ if (copy_link(curr, !dne))
+ this_failed = any_failed = 1;
+ }
+ break;
+ case S_IFDIR:
+ if (!Rflag && !rflag) {
+ if (curr->fts_info == FTS_D)
+ warnx("%s is a directory (not copied).",
+ curr->fts_path);
+ (void)fts_set(ftsp, curr, FTS_SKIP);
+ this_failed = any_failed = 1;
+ break;
+ }
+
+ /*
+ * Directories get noticed twice:
+ * In the first pass, create it if needed.
+ * In the second pass, after the children have been copied, set the permissions.
+ */
+ if (curr->fts_info == FTS_D) /* First pass */
+ {
+ /*
+ * If the directory doesn't exist, create the new
+ * one with the from file mode plus owner RWX bits,
+ * modified by the umask. Trade-off between being
+ * able to write the directory (if from directory is
+ * 555) and not causing a permissions race. If the
+ * umask blocks owner writes, we fail..
+ */
+ pushdne(dne);
+ if (dne) {
+ if (mkdir(to.p_path,
+ curr->fts_statp->st_mode | S_IRWXU) < 0)
+ err(EXIT_FAILURE, "%s",
+ to.p_path);
+ /* NOTREACHED */
+ } else if (!S_ISDIR(to_stat.st_mode)) {
+ errno = ENOTDIR;
+ err(EXIT_FAILURE, "%s",
+ to.p_path);
+ /* NOTREACHED */
+ }
+ }
+ else if (curr->fts_info == FTS_DP) /* Second pass */
+ {
+ /*
+ * If not -p and directory didn't exist, set it to be
+ * the same as the from directory, umodified by the
+ * umask; arguably wrong, but it's been that way
+ * forever.
+ */
+ if (pflag && setfile(curr->fts_statp, 0))
+ this_failed = any_failed = 1;
+ else if ((dne = popdne()))
+ (void)chmod(to.p_path,
+ curr->fts_statp->st_mode);
+ }
+ else
+ {
+ warnx("directory %s encountered when not expected.",
+ curr->fts_path);
+ this_failed = any_failed = 1;
+ break;
+ }
+
+ break;
+ case S_IFBLK:
+ case S_IFCHR:
+ if (Rflag) {
+ if (copy_special(curr->fts_statp, !dne))
+ this_failed = any_failed = 1;
+ } else
+ if (copy_file(curr, dne))
+ this_failed = any_failed = 1;
+ break;
+ case S_IFIFO:
+ if (Rflag) {
+ if (copy_fifo(curr->fts_statp, !dne))
+ this_failed = any_failed = 1;
+ } else
+ if (copy_file(curr, dne))
+ this_failed = any_failed = 1;
+ break;
+ default:
+ if (copy_file(curr, dne))
+ this_failed = any_failed = 1;
+ break;
+ }
+ if (vflag && !this_failed)
+ (void)printf("%s -> %s\n", curr->fts_path, to.p_path);
+ }
+ if (errno) {
+ err(EXIT_FAILURE, "fts_read");
+ /* NOTREACHED */
+ }
+ (void)fts_close(ftsp);
+ return (any_failed);
+}