X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=coreutils%2Fln.c;h=eb7171959cbe62b479753124fb817eda6df90309;hb=bb13079c8e9ca7bd86193a220baae1befb053fd6;hp=ead5322fa88351f8e579b1262e369b0ca6993b0e;hpb=f57c944e09417edcbcd69f2b01b937cadef39db2;p=oweals%2Fbusybox.git

diff --git a/coreutils/ln.c b/coreutils/ln.c
index ead5322fa..eb7171959 100644
--- a/coreutils/ln.c
+++ b/coreutils/ln.c
@@ -2,117 +2,108 @@
 /*
  * Mini ln implementation for busybox
  *
- * Copyright (C) 1999,2000 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
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include "busybox.h"
-#define BB_DECLARE_EXTERN
-#define bb_need_not_a_directory
-#include "messages.c"
+/* BB_AUDIT SUSv3 compliant */
+/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
 
-#include <stdio.h>
-#include <dirent.h>
-#include <errno.h>
+#include "libbb.h"
 
-#define LN_SYMLINK		1
-#define LN_FORCE			2
-#define LN_NODEREFERENCE	4
+/* This is a NOEXEC applet. Be very careful! */
 
-/*
- * linkDestName is where the link points to,
- * linkSrcName is the name of the link to be created.
- */
-static int fs_link(const char *link_DestName, const char *link_SrcName, const int flag)
+
+#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) MAIN_EXTERNALLY_VISIBLE;
+int ln_main(int argc, char **argv)
 {
-	int status;
-	int srcIsDir;
-	char *srcName;
-
-	if (link_DestName==NULL)
-		return(FALSE);
-
-	srcName = (char *) malloc(strlen(link_SrcName)+strlen(link_DestName)+1);
-
-	if (link_SrcName==NULL)
-		strcpy(srcName, link_DestName);
-	else
-		strcpy(srcName, link_SrcName);
-
-	if (flag&LN_NODEREFERENCE)
-		srcIsDir = is_directory(srcName, TRUE, NULL);
-	else
-		srcIsDir = is_directory(srcName, FALSE, NULL);	
-	
-	if ((srcIsDir==TRUE)&&((flag&LN_NODEREFERENCE)==0)) {
-		strcat(srcName, "/");
-		strcat(srcName, link_DestName);
+	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 (flag&LN_FORCE)
-		unlink(srcName);
-		
-	if (flag&LN_SYMLINK)
-		status = symlink(link_DestName, srcName);
-	else
-		status = link(link_DestName, srcName);
-
-	if (status != 0) {
-		perror(srcName);
-		return(FALSE);
+
+	last = argv[argc - 1];
+	argv += optind;
+
+	if (argc == optind + 1) {
+		*--argv = last;
+		last = bb_get_last_path_component_strip(xstrdup(last));
 	}
-	return(TRUE);
-}
 
-extern int ln_main(int argc, char **argv)
-{
-	int status = EXIT_SUCCESS;
-	int flag = 0;
-	int opt;
-	
-	/* Parse any options */
-	while ((opt=getopt(argc, argv, "sfn")) != -1) {
-		switch(opt) {
-			case 's':
-				flag |= LN_SYMLINK;
-				break;
-			case 'f':
-				flag |= LN_FORCE;
-				break;
-			case 'n':
-				flag |= LN_NODEREFERENCE;
-				break;
-			default:
-				usage(ln_usage);
+	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;
 		}
-	}
-	while(optind<(argc-1)) {
-		if (fs_link(argv[optind], argv[argc-1], flag)==FALSE)
+		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;
-		optind++;
-	}
-	return(status);
-}
+		}
 
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+		free(src_name);
+
+	} while ((++argv)[1]);
+
+	return status;
+}