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-rw-r--r--libbb/copy_file.c237
1 files changed, 237 insertions, 0 deletions
diff --git a/libbb/copy_file.c b/libbb/copy_file.c
new file mode 100644
index 0000000..c79fbeb
--- /dev/null
+++ b/libbb/copy_file.c
@@ -0,0 +1,237 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini copy_file implementation for busybox
+ *
+ *
+ * Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <utime.h>
+#include <errno.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libbb.h"
+
+int copy_file(const char *source, const char *dest, int flags)
+{
+ struct stat source_stat;
+ struct stat dest_stat;
+ int dest_exists = 1;
+ int status = 0;
+
+ if (((flags & FILEUTILS_PRESERVE_SYMLINKS) &&
+ lstat(source, &source_stat) < 0) ||
+ (!(flags & FILEUTILS_PRESERVE_SYMLINKS) &&
+ stat(source, &source_stat) < 0)) {
+ perror_msg("%s", source);
+ return -1;
+ }
+
+ if (stat(dest, &dest_stat) < 0) {
+ if (errno != ENOENT) {
+ perror_msg("unable to stat `%s'", dest);
+ return -1;
+ }
+ dest_exists = 0;
+ }
+
+ if (dest_exists && source_stat.st_rdev == dest_stat.st_rdev &&
+ source_stat.st_ino == dest_stat.st_ino) {
+ error_msg("`%s' and `%s' are the same file", source, dest);
+ return -1;
+ }
+
+ if (S_ISDIR(source_stat.st_mode)) {
+ DIR *dp;
+ struct dirent *d;
+ mode_t saved_umask = 0;
+
+ if (!(flags & FILEUTILS_RECUR)) {
+ error_msg("%s: omitting directory", source);
+ return -1;
+ }
+
+ /* Create DEST. */
+ if (dest_exists) {
+ if (!S_ISDIR(dest_stat.st_mode)) {
+ error_msg("`%s' is not a directory", dest);
+ return -1;
+ }
+ } else {
+ mode_t mode;
+ saved_umask = umask(0);
+
+ mode = source_stat.st_mode;
+ if (!(flags & FILEUTILS_PRESERVE_STATUS))
+ mode = source_stat.st_mode & ~saved_umask;
+ mode |= S_IRWXU;
+
+ if (mkdir(dest, mode) < 0) {
+ umask(saved_umask);
+ perror_msg("cannot create directory `%s'", dest);
+ return -1;
+ }
+
+ umask(saved_umask);
+ }
+
+ /* Recursively copy files in SOURCE. */
+ if ((dp = opendir(source)) == NULL) {
+ perror_msg("unable to open directory `%s'", source);
+ status = -1;
+ goto end;
+ }
+
+ while ((d = readdir(dp)) != NULL) {
+ char *new_source, *new_dest;
+
+ if (strcmp(d->d_name, ".") == 0 ||
+ strcmp(d->d_name, "..") == 0)
+ continue;
+
+ new_source = concat_path_file(source, d->d_name);
+ new_dest = concat_path_file(dest, d->d_name);
+ if (copy_file(new_source, new_dest, flags) < 0)
+ status = -1;
+ free(new_source);
+ free(new_dest);
+ }
+
+ /* ??? What if an error occurs in readdir? */
+
+ if (closedir(dp) < 0) {
+ perror_msg("unable to close directory `%s'", source);
+ status = -1;
+ }
+
+ if (!dest_exists &&
+ chmod(dest, source_stat.st_mode & ~saved_umask) < 0) {
+ perror_msg("unable to change permissions of `%s'", dest);
+ status = -1;
+ }
+ } else if (S_ISREG(source_stat.st_mode)) {
+ FILE *sfp, *dfp;
+
+ if (dest_exists) {
+ if (flags & FILEUTILS_INTERACTIVE) {
+ fprintf(stderr, "%s: overwrite `%s'? ", applet_name, dest);
+ if (!ask_confirmation())
+ return 0;
+ }
+
+ if ((dfp = fopen(dest, "w")) == NULL) {
+ if (!(flags & FILEUTILS_FORCE)) {
+ perror_msg("unable to open `%s'", dest);
+ return -1;
+ }
+
+ if (unlink(dest) < 0) {
+ perror_msg("unable to remove `%s'", dest);
+ return -1;
+ }
+
+ dest_exists = 0;
+ }
+ }
+
+ if (!dest_exists) {
+ int fd;
+
+ if ((fd = open(dest, O_WRONLY|O_CREAT, source_stat.st_mode)) < 0 ||
+ (dfp = fdopen(fd, "w")) == NULL) {
+ if (fd >= 0)
+ close(fd);
+ perror_msg("unable to open `%s'", dest);
+ return -1;
+ }
+ }
+
+ if ((sfp = fopen(source, "r")) == NULL) {
+ fclose(dfp);
+ perror_msg("unable to open `%s'", source);
+ status = -1;
+ goto end;
+ }
+
+ if (copy_file_chunk(sfp, dfp, -1) < 0)
+ status = -1;
+
+ if (fclose(dfp) < 0) {
+ perror_msg("unable to close `%s'", dest);
+ status = -1;
+ }
+
+ if (fclose(sfp) < 0) {
+ perror_msg("unable to close `%s'", source);
+ status = -1;
+ }
+ } else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode) ||
+ S_ISSOCK(source_stat.st_mode)) {
+ if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) {
+ perror_msg("unable to create `%s'", dest);
+ return -1;
+ }
+ } else if (S_ISFIFO(source_stat.st_mode)) {
+ if (mkfifo(dest, source_stat.st_mode) < 0) {
+ perror_msg("cannot create fifo `%s'", dest);
+ return -1;
+ }
+ } else if (S_ISLNK(source_stat.st_mode)) {
+ char *lpath = xreadlink(source);
+ if (symlink(lpath, dest) < 0) {
+ perror_msg("cannot create symlink `%s'", dest);
+ return -1;
+ }
+ free(lpath);
+
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
+ if (flags & FILEUTILS_PRESERVE_STATUS)
+ if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0)
+ perror_msg("unable to preserve ownership of `%s'", dest);
+#endif
+ return 0;
+ } else {
+ error_msg("internal error: unrecognized file type");
+ return -1;
+ }
+
+end:
+
+ if (flags & FILEUTILS_PRESERVE_STATUS) {
+ struct utimbuf times;
+
+ times.actime = source_stat.st_atime;
+ times.modtime = source_stat.st_mtime;
+ if (utime(dest, &times) < 0)
+ perror_msg("unable to preserve times of `%s'", dest);
+ if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) {
+ source_stat.st_mode &= ~(S_ISUID | S_ISGID);
+ perror_msg("unable to preserve ownership of `%s'", dest);
+ }
+ if (chmod(dest, source_stat.st_mode) < 0)
+ perror_msg("unable to preserve permissions of `%s'", dest);
+ }
+
+ return status;
+}
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