X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=coreutils%2Fln.c;h=eb7171959cbe62b479753124fb817eda6df90309;hb=eab40e58858d01372b5d74b7330be2d7b1c7fc75;hp=62496fba09b84b779784647112e9892683fafdc5;hpb=29d2e362dedf42d60ffebf6756144fb5449e753a;p=oweals%2Fbusybox.git

diff --git a/coreutils/ln.c b/coreutils/ln.c
index 62496fba0..eb7171959 100644
--- a/coreutils/ln.c
+++ b/coreutils/ln.c
@@ -1,95 +1,109 @@
+/* vi: set sw=4 ts=4: */
 /*
  * Mini ln implementation for busybox
  *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  *
- * Copyright (C) 1999 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
- *
- * 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include "internal.h"
-#include <stdio.h>
-#include <dirent.h>
-#include <errno.h>
-
+/* BB_AUDIT SUSv3 compliant */
+/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
 
-static const char ln_usage[] = "ln [OPTION] TARGET... LINK_NAME|DIRECTORY\n"
-"Create a link named LINK_NAME or DIRECTORY to the specified TARGET\n"
-"\nOptions:\n"
-"\t-s\tmake symbolic links instead of hard links\n"
-"\t-f\tremove existing destination files\n";
+#include "libbb.h"
 
+/* This is a NOEXEC applet. Be very careful! */
 
-static int symlinkFlag = FALSE;
-static int removeoldFlag = FALSE;
 
+#define LN_SYMLINK          1
+#define LN_FORCE            2
+#define LN_NODEREFERENCE    4
+#define LN_BACKUP           8
+#define LN_SUFFIX           16
 
-extern int ln_main(int argc, char **argv)
+int ln_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ln_main(int argc, char **argv)
 {
-    int status;
-    static char* linkName;
-
-    if (argc < 3) {
-	usage (ln_usage);
-    }
-    argc--;
-    argv++;
-
-    /* Parse any options */
-    while (**argv == '-') {
-	while (*++(*argv))
-	    switch (**argv) {
-	    case 's':
-		symlinkFlag = TRUE;
-		break;
-	    case 'f':
-		removeoldFlag = TRUE;
-		break;
-	    default:
-		usage (ln_usage);
-	    }
-	argc--;
-	argv++;
-    }
-
-
-    linkName = argv[argc - 1];
-
-    if ((argc > 3) && !(isDirectory(linkName))) {
-	fprintf(stderr, "%s: not a directory\n", linkName);
-	exit (FALSE);
-    }
-
-    while (argc-- >= 2) {
-	if (removeoldFlag==TRUE ) {
-	    status = ( unlink(linkName) && errno != ENOENT );
-	    if ( status != 0 ) {
-		perror(linkName);
-		exit( FALSE);
-	    }
+	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(argv, "sfnbS:", &suffix);
+
+	if (argc == optind) {
+		bb_show_usage();
 	}
-	if ( symlinkFlag==TRUE)
-		status = symlink(*argv, linkName);
-	else
-		status = link(*argv, linkName);
-	if ( status != 0 ) {
-	    perror(linkName);
-	    exit( FALSE);
+
+	last = argv[argc - 1];
+	argv += optind;
+
+	if (argc == optind + 1) {
+		*--argv = last;
+		last = bb_get_last_path_component_strip(xstrdup(last));
 	}
-    }
-    exit( TRUE);
+
+	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_strip(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_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_simple_perror_msg(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_simple_perror_msg(src);
+			status = EXIT_FAILURE;
+		}
+
+		free(src_name);
+
+	} while ((++argv)[1]);
+
+	return status;
 }