/*
* Mini ln implementation for busybox
*
- *
- * Copyright (C) 1999 by Lineo, inc.
+ * Copyright (C) 1999,2000,2001 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
*
*/
-#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 <string.h>
+#include <stdlib.h>
#include <errno.h>
-#include <sys/param.h> /* for PATH_MAX */
-
-static const char ln_usage[] =
- "ln [OPTION] TARGET... LINK_NAME|DIRECTORY\n\n"
- "Create 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"
+#include <unistd.h>
+#include "busybox.h"
+#define BB_DECLARE_EXTERN
+#define bb_need_not_a_directory
+#include "messages.c"
- "\t-f\tremove existing destination files\n"
- "\t-n\tno dereference symlinks - treat like normal file\n";
-static int symlinkFlag = FALSE;
-static int removeoldFlag = FALSE;
-static int followLinks = TRUE;
+static const int LN_SYMLINK = 1;
+static const int LN_FORCE = 2;
+static const int LN_NODEREFERENCE = 4;
-extern int ln_main(int argc, char **argv)
+/*
+ * 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)
{
- char *linkName;
- int linkIntoDirFlag;
-
- if (argc < 3) {
- usage(ln_usage);
+ int status;
+ int src_is_dir;
+ char *src_name;
+
+ if (link_destname==NULL)
+ return(FALSE);
+
+ src_name = (char *) xmalloc(strlen(link_srcname)+strlen(link_destname)+1);
+
+ if (link_srcname==NULL)
+ strcpy(src_name, link_destname);
+ else
+ strcpy(src_name, link_srcname);
+
+ 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;
+
+ srcdir_name = xstrdup(link_destname);
+ strcat(src_name, "/");
+ strcat(src_name, get_last_path_component(srcdir_name));
+ free(srcdir_name);
}
- argc--;
- argv++;
+
+ 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);
+ }
+ return(TRUE);
+}
+extern int ln_main(int argc, char **argv)
+{
+ int status = EXIT_SUCCESS;
+ int flag = 0;
+ int opt;
+
/* Parse any options */
- while (**argv == '-') {
- while (*++(*argv))
- switch (**argv) {
+ while ((opt=getopt(argc, argv, "sfn")) != -1) {
+ switch(opt) {
case 's':
- symlinkFlag = TRUE;
+ flag |= LN_SYMLINK;
break;
case 'f':
- removeoldFlag = TRUE;
+ flag |= LN_FORCE;
break;
case 'n':
- followLinks = FALSE;
+ flag |= LN_NODEREFERENCE;
break;
default:
- usage(ln_usage);
- }
- argc--;
- argv++;
+ show_usage();
+ }
}
-
- linkName = argv[argc - 1];
-
- if (strlen(linkName) > PATH_MAX) {
- fprintf(stderr, name_too_long, "ln");
- exit FALSE;
+ if (optind > (argc-1)) {
+ show_usage();
+ }
+ if (optind == (argc-1)) {
+ if (fs_link(argv[optind],
+ get_last_path_component(argv[optind]), flag)==FALSE)
+ status = EXIT_FAILURE;
}
-
- linkIntoDirFlag = isDirectory(linkName, TRUE);
-
- if ((argc > 3) && !linkIntoDirFlag) {
- fprintf(stderr, not_a_directory, "ln", linkName);
- exit FALSE;
+ while(optind<(argc-1)) {
+ if (fs_link(argv[optind], argv[argc-1], flag)==FALSE)
+ status = EXIT_FAILURE;
+ optind++;
}
-
- while (argc-- >= 2) {
- char srcName[PATH_MAX + 1];
- int nChars, status;
-
- if (strlen(*argv) > PATH_MAX) {
- fprintf(stderr, name_too_long, "ln");
- exit FALSE;
- }
-
- if (followLinks == FALSE) {
- strcpy(srcName, *argv);
- } else {
- /* Warning! This can silently truncate if > PATH_MAX, but
- I don't think that there can be one > PATH_MAX anyway. */
- nChars = readlink(*argv, srcName, PATH_MAX);
- 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(status);
}
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/