X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=coreutils%2Fln.c;h=229c682185ef029a0bb80deeacc05b30c23d453e;hb=e2e56c7c4129de7d20df42e8239fd304c81ef29b;hp=6d41cce62c67dd07602379ebaf7f697d971b2997;hpb=cbe31dace5fb24304694d399b9eb267fbe752516;p=oweals%2Fbusybox.git

diff --git a/coreutils/ln.c b/coreutils/ln.c
index 6d41cce62..229c68218 100644
--- a/coreutils/ln.c
+++ b/coreutils/ln.c
@@ -2,8 +2,7 @@
 /*
  * Mini ln implementation for busybox
  *
- * Copyright (C) 1999,2000,2001 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.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
@@ -21,114 +20,99 @@
  *
  */
 
+/* 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 <string.h>
 #include <stdlib.h>
-#include <errno.h>
 #include <unistd.h>
+#include <errno.h>
 #include "busybox.h"
-#define BB_DECLARE_EXTERN
-#define bb_need_not_a_directory
-#include "messages.c"
-
 
-static const int LN_SYMLINK = 1;
-static const int LN_FORCE = 2;
-static const int LN_NODEREFERENCE = 4;
+#define LN_SYMLINK          1
+#define LN_FORCE            2
+#define LN_NODEREFERENCE    4
+#define LN_BACKUP           8
+#define LN_SUFFIX           16
 
-/*
- * 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)
+int ln_main(int argc, char **argv)
 {
-	int status;
-	int src_is_dir;
+	int status = EXIT_SUCCESS;
+	int flag;
+	char *last;
 	char *src_name;
+	char *src;
+	char *suffix = "~";
+	struct stat statbuf;
+	int (*link_func)(const char *, const char *);
 
-	if (link_destname==NULL)
-		return(FALSE);
-
-	src_name = (char *) xmalloc(strlen(link_srcname)+strlen(link_destname)+1);
+	flag = bb_getopt_ulflags(argc, argv, "sfnbS:", &suffix);
 
-	if (link_srcname==NULL)
-		strcpy(src_name, link_destname);
-	else
-		strcpy(src_name, link_srcname);
+	if (argc == optind) {
+		bb_show_usage();
+	}
 
-	if (flag&LN_NODEREFERENCE)
-		src_is_dir = is_directory(src_name, TRUE, NULL);
-	else
-		src_is_dir = is_directory(src_name, FALSE, NULL);	
-	
-	if ((src_is_dir==TRUE)&&((flag&LN_NODEREFERENCE)==0)) {
-		char* srcdir_name;
+	last = argv[argc - 1];
+	argv += optind;
 
-		srcdir_name = xstrdup(link_destname);
-		strcat(src_name, "/");
-		strcat(src_name, get_last_path_component(srcdir_name));
-		free(srcdir_name);
-	}
-	
-	if (flag&LN_FORCE)
-		unlink(src_name);
-		
-	if (flag&LN_SYMLINK)
-		status = symlink(link_destname, src_name);
-	else
-		status = link(link_destname, src_name);
-
-	if (status != 0) {
-		perror_msg(src_name);
-		return(FALSE);
+	if (argc == optind + 1) {
+		*--argv = last;
+		last = bb_get_last_path_component(bb_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:
-				show_usage();
+	do {
+		src_name = NULL;
+		src = last;
+
+		if (is_directory(src,
+						 (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
+						 NULL)) {
+			src_name = bb_xstrdup(*argv);
+			src = concat_path_file(src, bb_get_last_path_component(src_name));
+			free(src_name);
+			src_name = src;
 		}
-	}
-	if (optind > (argc-1)) {
-		show_usage();
-	} 
-	if (optind == (argc-1)) {
-		if (fs_link(argv[optind], 
-					get_last_path_component(argv[optind]), flag)==FALSE)
+		if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
+			bb_perror_msg("%s", *argv);
 			status = EXIT_FAILURE;
-	}
-	while(optind<(argc-1)) {
-		if (fs_link(argv[optind], argv[argc-1], flag)==FALSE)
+			free(src_name);
+			continue;
+		}
+
+		if (flag & LN_BACKUP) {
+				char *backup;
+				backup = bb_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;
-		optind++;
-	}
-	exit(status);
-}
+		}
 
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+		free(src_name);
+
+	} while ((++argv)[1]);
+
+	return status;
+}