Update internal.h to conditionally include asm/string.h

[oweals/busybox.git] / ln.c

diff --git a/ln.c b/ln.c
index 3e87b579e7e9a0a4fa15ef1d3624aa06fd18f6a4..2233a1d68d032d318d13cd6e43ae745e34526d2b 100644 (file)
--- a/ln.c
+++ b/ln.c
@@ -1,52 +1,148 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * 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
+ *
+ */
+
 #include "internal.h"
+#define BB_DECLARE_EXTERN
+#define bb_need_name_too_long
+#define bb_need_not_a_directory
+#include "messages.c"
+
 #include <stdio.h>
-#include <sys/stat.h>
-#include <sys/param.h>
+#include <dirent.h>
 #include <errno.h>
 
-const char     ln_usage[] = "ln [-s] [-f] original-name additional-name\n"
-"\n"
-"\tAdd a new name that refers to the same file as \"original-name\"\n"
-"\n"
-"\t-s:\tUse a \"symbolic\" link, instead of a \"hard\" link.\n"
-"\t-f:\tRemove existing destination files.\n";
+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"
+
+       "\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;
 
-int
-ln_fn(const struct FileInfo * i)
+extern int ln_main(int argc, char **argv)
 {
-       int                             status = 0;
-       char                    d[PATH_MAX];
-       const char *    destination = i->destination;
+       char *linkName;
+       int linkIntoDirFlag;
+       int stopIt = FALSE;
 
-       if ( !i->makeSymbolicLink && (i->stat.st_mode & S_IFMT) == S_IFDIR ) {
-               fprintf(stderr, "Please use \"ln -s\" to link directories.\n");
-               return 1;
+       argc--;
+       argv++;
+
+       /* Parse any options */
+       while (argc > 0 && stopIt == FALSE) {
+               if (**argv == '-') {
+                       while (*++(*argv))
+                               switch (**argv) {
+                                       case 's':
+                                               symlinkFlag = TRUE;
+                                               break;
+                                       case 'f':
+                                               removeoldFlag = TRUE;
+                                               break;
+                                       case 'n':
+                                               followLinks = FALSE;
+                                               break;
+                                       case '-':
+                                               stopIt = TRUE;
+                                               break;
+                                       default:
+                                               usage(ln_usage);
+                               }
+                       argc--;
+                       argv++;
+               }
+               else
+                       break;
        }
 
-       /*
-        * If the destination is a directory, create a file within it.
-        */
-       if ( is_a_directory(i->destination) ) {
-                       destination = join_paths(
-                        d
-                       ,i->destination
-                       ,&i->source[i->directoryLength]);
+       if (argc < 2) {
+               usage(ln_usage);
        }
 
-       if ( i->force )
-               status = ( unlink(destination) && errno != ENOENT );
+       linkName = argv[argc - 1];
 
-       if ( status == 0 ) {
-               if ( i->makeSymbolicLink )
-                       status = symlink(i->source, destination);
-               else
-                       status = link(i->source, destination);
+       if (strlen(linkName) > BUFSIZ) {
+               fprintf(stderr, name_too_long, "ln");
+               exit FALSE;
+       }
+
+       linkIntoDirFlag = isDirectory(linkName, TRUE, NULL);
+
+       if ((argc >= 3) && linkIntoDirFlag == FALSE) {
+               fprintf(stderr, not_a_directory, "ln", linkName);
+               exit FALSE;
        }
 
-       if ( status != 0 ) {
-               name_and_error(destination);
-               return 1;
+       while (argc-- >= 2) {
+               char srcName[BUFSIZ + 1];
+               int nChars, status;
+
+               if (strlen(*argv) > BUFSIZ) {
+                       fprintf(stderr, name_too_long, "ln");
+                       exit FALSE;
+               }
+
+               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 (removeoldFlag == TRUE) {
+                       status = (unlink(linkName) && errno != ENOENT);
+                       if (status != 0) {
+                               perror(linkName);
+                               exit FALSE;
+                       }
+               }
+
+               if (symlinkFlag == TRUE)
+                       status = symlink(*argv, linkName);
+               else
+                       status = link(*argv, linkName);
+               if (status != 0) {
+                       perror(linkName);
+                       exit FALSE;
+               }
        }
-       else
-               return 0;
+       return( TRUE);
 }
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/