/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
-#include "busybox.h"
+#include "libbb.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
#define LN_SYMLINK 1
#define LN_FORCE 2
#define LN_BACKUP 8
#define LN_SUFFIX 16
+int ln_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ln_main(int argc, char **argv)
{
int status = EXIT_SUCCESS;
char *last;
char *src_name;
char *src;
- char *suffix = "~";
+ char *suffix = (char*)"~";
struct stat statbuf;
int (*link_func)(const char *, const char *);
- flag = getopt32(argc, argv, "sfnbS:", &suffix);
+ flag = getopt32(argv, "sfnbS:", &suffix);
if (argc == optind) {
bb_show_usage();
if (argc == optind + 1) {
*--argv = last;
- last = bb_get_last_path_component(xstrdup(last));
+ last = bb_get_last_path_component_strip(xstrdup(last));
}
do {
src = last;
if (is_directory(src,
- (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
- NULL)) {
+ (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
+ NULL)
+ ) {
src_name = xstrdup(*argv);
- src = concat_path_file(src, bb_get_last_path_component(src_name));
+ src = concat_path_file(src, bb_get_last_path_component_strip(src_name));
free(src_name);
src_name = src;
}
if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
- bb_perror_msg("%s", *argv);
- status = EXIT_FAILURE;
- free(src_name);
- continue;
+ // coreutils: "ln dangling_symlink new_hardlink" works
+ if (lstat(*argv, &statbuf) || !S_ISLNK(statbuf.st_mode)) {
+ bb_simple_perror_msg(*argv);
+ status = EXIT_FAILURE;
+ free(src_name);
+ continue;
+ }
}
if (flag & LN_BACKUP) {
- char *backup;
- backup = xasprintf("%s%s", src, suffix);
- if (rename(src, backup) < 0 && errno != ENOENT) {
- bb_perror_msg("%s", src);
- status = EXIT_FAILURE;
- free(backup);
- continue;
- }
+ char *backup;
+ backup = xasprintf("%s%s", src, suffix);
+ if (rename(src, backup) < 0 && errno != ENOENT) {
+ bb_simple_perror_msg(src);
+ status = EXIT_FAILURE;
free(backup);
- /*
- * When the source and dest are both hard links to the same
- * inode, a rename may succeed even though nothing happened.
- * Therefore, always unlink().
- */
- unlink(src);
+ continue;
+ }
+ free(backup);
+ /*
+ * When the source and dest are both hard links to the same
+ * inode, a rename may succeed even though nothing happened.
+ * Therefore, always unlink().
+ */
+ unlink(src);
} else if (flag & LN_FORCE) {
unlink(src);
}
}
if (link_func(*argv, src) != 0) {
- bb_perror_msg("%s", src);
+ bb_simple_perror_msg(src);
status = EXIT_FAILURE;
}