summaryrefslogtreecommitdiff
path: root/i/pc104/initrd/conf/busybox/coreutils/ln.c
diff options
context:
space:
mode:
Diffstat (limited to 'i/pc104/initrd/conf/busybox/coreutils/ln.c')
-rw-r--r--i/pc104/initrd/conf/busybox/coreutils/ln.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/coreutils/ln.c b/i/pc104/initrd/conf/busybox/coreutils/ln.c
new file mode 100644
index 0000000..7207134
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/coreutils/ln.c
@@ -0,0 +1,105 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini ln implementation for busybox
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+/* BB_AUDIT SUSv3 compliant */
+/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
+
+#include "busybox.h"
+
+#define LN_SYMLINK 1
+#define LN_FORCE 2
+#define LN_NODEREFERENCE 4
+#define LN_BACKUP 8
+#define LN_SUFFIX 16
+
+int ln_main(int argc, char **argv);
+int ln_main(int argc, char **argv)
+{
+ int status = EXIT_SUCCESS;
+ int flag;
+ char *last;
+ char *src_name;
+ char *src;
+ char *suffix = (char*)"~";
+ struct stat statbuf;
+ int (*link_func)(const char *, const char *);
+
+ flag = getopt32(argc, argv, "sfnbS:", &suffix);
+
+ if (argc == optind) {
+ bb_show_usage();
+ }
+
+ last = argv[argc - 1];
+ argv += optind;
+
+ if (argc == optind + 1) {
+ *--argv = last;
+ last = bb_get_last_path_component(xstrdup(last));
+ }
+
+ do {
+ src_name = NULL;
+ src = last;
+
+ if (is_directory(src,
+ (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
+ NULL)) {
+ src_name = xstrdup(*argv);
+ src = concat_path_file(src, bb_get_last_path_component(src_name));
+ free(src_name);
+ src_name = src;
+ }
+ if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
+ // coreutils: "ln dangling_symlink new_hardlink" works
+ if (lstat(*argv, &statbuf) || !S_ISLNK(statbuf.st_mode)) {
+ bb_perror_msg("%s", *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;
+ }
+ 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);
+ }
+
+ link_func = link;
+ if (flag & LN_SYMLINK) {
+ link_func = symlink;
+ }
+
+ if (link_func(*argv, src) != 0) {
+ bb_perror_msg("%s", src);
+ status = EXIT_FAILURE;
+ }
+
+ free(src_name);
+
+ } while ((++argv)[1]);
+
+ return status;
+}