1 files changed, 180 insertions, 0 deletions

diff --git a/libbb/copy_file.c b/libbb/copy_file.c
new file mode 100644
index 000000000..64b65b9fa
--- /dev/null
+++ b/libbb/copy_file.c
@@ -0,0 +1,180 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) tons of folks.  Tracking down who wrote what
+ * isn't something I'm going to worry about...  If you wrote something
+ * here, please feel free to acknowledge your work.
+ *
+ * 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
+ *
+ * Based in part on code from sash, Copyright (c) 1999 by David I. Bell 
+ * Permission has been granted to redistribute this code under the GPL.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <utime.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include "libbb.h"
+
+
+/*
+ * Copy one file to another, while possibly preserving its modes, times, and
+ * modes.  Returns TRUE if successful, or FALSE on a failure with an error
+ * message output.  (Failure is not indicated if attributes cannot be set.)
+ * -Erik Andersen
+ */
+int
+copy_file(const char *srcName, const char *destName,
+                 int setModes, int followLinks, int forceFlag)
+{
+        int rfd;
+        int wfd;
+        int status;
+        struct stat srcStatBuf;
+        struct stat dstStatBuf;
+        struct utimbuf times;
+
+        if (followLinks == TRUE)
+                status = stat(srcName, &srcStatBuf);
+        else
+                status = lstat(srcName, &srcStatBuf);
+
+        if (status < 0) {
+                perror_msg("%s", srcName);
+                return FALSE;
+        }
+
+        if (followLinks == TRUE)
+                status = stat(destName, &dstStatBuf);
+        else
+                status = lstat(destName, &dstStatBuf);
+
+        if (status < 0 || forceFlag==TRUE) {
+                unlink(destName);
+                dstStatBuf.st_ino = -1;
+                dstStatBuf.st_dev = -1;
+        }
+
+        if ((srcStatBuf.st_dev == dstStatBuf.st_dev) &&
+                (srcStatBuf.st_ino == dstStatBuf.st_ino)) {
+                error_msg("Copying file \"%s\" to itself", srcName);
+                return FALSE;
+        }
+
+        if (S_ISDIR(srcStatBuf.st_mode)) {
+                //fprintf(stderr, "copying directory %s to %s\n", srcName, destName);
+                /* Make sure the directory is writable */
+                status = mkdir(destName, 0777777 ^ umask(0));
+                if (status < 0 && errno != EEXIST) {
+                        perror_msg("%s", destName);
+                        return FALSE;
+                }
+        } else if (S_ISLNK(srcStatBuf.st_mode)) {
+                char link_val[BUFSIZ + 1];
+                int link_size;
+
+                //fprintf(stderr, "copying link %s to %s\n", srcName, destName);
+                /* Warning: This could possibly truncate silently, to BUFSIZ chars */
+                link_size = readlink(srcName, &link_val[0], BUFSIZ);
+                if (link_size < 0) {
+                        perror_msg("%s", srcName);
+                        return FALSE;
+                }
+                link_val[link_size] = '\0';
+                status = symlink(link_val, destName);
+                if (status < 0) {
+                        perror_msg("%s", destName);
+                        return FALSE;
+                }
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
+                if (setModes == TRUE) {
+                        /* Try to set owner, but fail silently like GNU cp */
+                        lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
+                }
+#endif
+                return TRUE;
+        } else if (S_ISFIFO(srcStatBuf.st_mode)) {
+                //fprintf(stderr, "copying fifo %s to %s\n", srcName, destName);
+                if (mkfifo(destName, 0644) < 0) {
+                        perror_msg("%s", destName);
+                        return FALSE;
+                }
+        } else if (S_ISBLK(srcStatBuf.st_mode) || S_ISCHR(srcStatBuf.st_mode)
+                           || S_ISSOCK(srcStatBuf.st_mode)) {
+                //fprintf(stderr, "copying soc, blk, or chr %s to %s\n", srcName, destName);
+                if (mknod(destName, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) {
+                        perror_msg("%s", destName);
+                        return FALSE;
+                }
+        } else if (S_ISREG(srcStatBuf.st_mode)) {
+                //fprintf(stderr, "copying regular file %s to %s\n", srcName, destName);
+                rfd = open(srcName, O_RDONLY);
+                if (rfd < 0) {
+                        perror_msg("%s", srcName);
+                        return FALSE;
+                }
+
+                wfd = open(destName, O_WRONLY | O_CREAT | O_TRUNC,
+                                 srcStatBuf.st_mode);
+                if (wfd < 0) {
+                        perror_msg("%s", destName);
+                        close(rfd);
+                        return FALSE;
+                }
+
+                if (copy_file_chunk(rfd, wfd, srcStatBuf.st_size)==FALSE)
+                        goto error_exit;        
+                
+                close(rfd);
+                if (close(wfd) < 0) {
+                        return FALSE;
+                }
+        }
+
+        if (setModes == TRUE) {
+                /* This is fine, since symlinks never get here */
+                if (chown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0)
+                        perror_msg_and_die("%s", destName);
+                if (chmod(destName, srcStatBuf.st_mode) < 0)
+                        perror_msg_and_die("%s", destName);
+                times.actime = srcStatBuf.st_atime;
+                times.modtime = srcStatBuf.st_mtime;
+                if (utime(destName, &times) < 0)
+                        perror_msg_and_die("%s", destName);
+        }
+
+        return TRUE;
+
+  error_exit:
+        perror_msg("%s", destName);
+        close(rfd);
+        close(wfd);
+
+        return FALSE;
+}
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/