X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=coreutils%2Fln.c;h=229c682185ef029a0bb80deeacc05b30c23d453e;hb=e2e56c7c4129de7d20df42e8239fd304c81ef29b;hp=d4fa47306b585164571b731091903b73b29301f0;hpb=815e90447064e287ad181c1231636e7f1b44f76c;p=oweals%2Fbusybox.git

diff --git a/coreutils/ln.c b/coreutils/ln.c
index d4fa47306..229c68218 100644
--- a/coreutils/ln.c
+++ b/coreutils/ln.c
@@ -2,8 +2,7 @@
 /*
  * Mini ln implementation for busybox
  *
- * Copyright (C) 1999,2000 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
@@ -21,124 +20,99 @@
  *
  */
 
-#include "internal.h"
-#define BB_DECLARE_EXTERN
-#define bb_need_name_too_long
-#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 <stdlib.h>
+#include <unistd.h>
 #include <errno.h>
+#include "busybox.h"
 
-static const char ln_usage[] =
-	"ln [OPTION] TARGET... LINK_NAME|DIRECTORY\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
-	"\nCreate a link named LINK_NAME or DIRECTORY to the specified TARGET\n\n"
-	"Options:\n"
-	"\t-s\tmake symbolic links instead of hard links\n"
+#define LN_SYMLINK          1
+#define LN_FORCE            2
+#define LN_NODEREFERENCE    4
+#define LN_BACKUP           8
+#define LN_SUFFIX           16
 
-	"\t-f\tremove existing destination files\n"
-	"\t-n\tno dereference symlinks - treat like normal file\n"
-#endif
-	;
-
-static int symlinkFlag = FALSE;
-static int removeoldFlag = FALSE;
-static int followLinks = TRUE;
-
-extern int ln_main(int argc, char **argv)
+int ln_main(int argc, char **argv)
 {
-	char *linkName;
-	int linkIntoDirFlag;
-
-	if (argc < 3) {
-		usage(ln_usage);
-	}
-	argc--;
-	argv++;
-
-	/* Parse any options */
-	while (--argc >= 0 && *argv && **argv) {
-		while (**argv == '-') {
-			while (*++(*argv))
-				switch (**argv) {
-					case 's':
-						symlinkFlag = TRUE;
-						break;
-					case 'f':
-						removeoldFlag = TRUE;
-						break;
-					case 'n':
-						followLinks = FALSE;
-						break;
-					default:
-						usage(ln_usage);
-				}
-		}
-		argv++;
-	}
-
-	if (argc < 1) {
-		fatalError("ln: missing file argument\n");
-	}
-
-	linkName = argv[argc - 1];
-
-	if (strlen(linkName) > BUFSIZ) {
-		fprintf(stderr, name_too_long, "ln");
-		exit FALSE;
+	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 *);
+
+	flag = bb_getopt_ulflags(argc, argv, "sfnbS:", &suffix);
+
+	if (argc == optind) {
+		bb_show_usage();
 	}
 
-	linkIntoDirFlag = isDirectory(linkName, TRUE, NULL);
+	last = argv[argc - 1];
+	argv += optind;
 
-	if ((argc > 3) && !linkIntoDirFlag) {
-		fprintf(stderr, not_a_directory, "ln", linkName);
-		exit FALSE;
+	if (argc == optind + 1) {
+		*--argv = last;
+		last = bb_get_last_path_component(bb_xstrdup(last));
 	}
 
-	while (argc-- >= 2) {
-		char srcName[BUFSIZ + 1];
-		int nChars, status;
-
-		if (strlen(*argv) > BUFSIZ) {
-			fprintf(stderr, name_too_long, "ln");
-			exit FALSE;
+	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 (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
+			bb_perror_msg("%s", *argv);
+			status = EXIT_FAILURE;
+			free(src_name);
+			continue;
 		}
 
-		if (followLinks == FALSE) {
-			strcpy(srcName, *argv);
-		} else {
-			/* Warning!  This can silently truncate if > BUFSIZ, but
-			   I don't think that there can be one > BUFSIZ anyway. */
-			nChars = readlink(*argv, srcName, BUFSIZ);
-			srcName[nChars] = '\0';
+		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);
 		}
 
-		if (removeoldFlag == TRUE) {
-			status = (unlink(linkName) && errno != ENOENT);
-			if (status != 0) {
-				perror(linkName);
-				exit FALSE;
-			}
+		link_func = link;
+		if (flag & LN_SYMLINK) {
+			link_func = symlink;
 		}
 
-		if (symlinkFlag == TRUE)
-			status = symlink(*argv, linkName);
-		else
-			status = link(*argv, linkName);
-		if (status != 0) {
-			perror(linkName);
-			exit FALSE;
+		if (link_func(*argv, src) != 0) {
+			bb_perror_msg("%s", src);
+			status = EXIT_FAILURE;
 		}
-	}
-	exit TRUE;
-}
 
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+		free(src_name);
+
+	} while ((++argv)[1]);
+
+	return status;
+}