Minor fixes to being a standalone shell.

[oweals/busybox.git] / ln.c

diff --git a/ln.c b/ln.c
index 1e30e2b2914b8f7321bb683456354fcf552e2293..29ff938635df4131c6180b1b130e36a12c4a72b6 100644 (file)
--- a/ln.c
+++ b/ln.c
@@ -1,8 +1,8 @@
+/* vi: set sw=4 ts=4: */
 /*
  * Mini ln implementation for busybox
  *
- *
- * Copyright (C) 1999 by Lineo, inc.
+ * 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
@@ -22,79 +22,118 @@
  */
 
 #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 <dirent.h>
 #include <errno.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"
 
-static 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";
-
+       "\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 const char *destName;
-
+static int followLinks = TRUE;
 
 extern int ln_main(int argc, char **argv)
 {
-    int status;
-    char newdestName[NAME_MAX];
-
-    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);
-           }
+       char *linkName;
+       int linkIntoDirFlag;
+
+       if (argc < 3) {
+               usage(ln_usage);
+       }
        argc--;
        argv++;
-    }
-
-
-    destName = argv[argc - 1];
-
-    if ((argc > 3) && !(isDirectory(destName))) {
-       fprintf(stderr, "%s: not a directory\n", destName);
-       exit (FALSE);
-    }
-
-    while (argc-- >= 2) {
-       strcpy(newdestName, destName);
-       strcat(newdestName, (*argv)+(strlen(*(++argv))));
-       
-       if (removeoldFlag==TRUE ) {
-           status = ( unlink(newdestName) && errno != ENOENT );
-           if ( status != 0 ) {
-               perror(newdestName);
-               exit( FALSE);
-           }
+
+       /* Parse any options */
+       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);
+                       }
+               argc--;
+               argv++;
+       }
+
+       linkName = argv[argc - 1];
+
+       if (strlen(linkName) > BUFSIZ) {
+               fprintf(stderr, name_too_long, "ln");
+               exit FALSE;
        }
-       if ( symlinkFlag==TRUE)
-               status = symlink(*argv, newdestName);
-       else
-               status = link(*argv, newdestName);
-       if ( status != 0 ) {
-           perror(newdestName);
-           exit( FALSE);
+
+       linkIntoDirFlag = isDirectory(linkName, TRUE, NULL);
+
+       if ((argc > 3) && !linkIntoDirFlag) {
+               fprintf(stderr, not_a_directory, "ln", linkName);
+               exit FALSE;
+       }
+
+       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;
+               }
        }
-    }
-    exit( TRUE);
+       exit TRUE;
 }
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/