/*
* Mini pwd implementation for busybox
*
- *
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
*
- * 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config PWD
+//config: bool "pwd"
+//config: default y
+//config: help
+//config: pwd is used to print the current directory.
-#include "internal.h"
-#include <stdio.h>
-#include <dirent.h>
-#include <errno.h>
+//applet:IF_PWD(APPLET_NOFORK(pwd, pwd, BB_DIR_BIN, BB_SUID_DROP, pwd))
-extern int pwd_main(int argc, char **argv)
+//kbuild:lib-$(CONFIG_PWD) += pwd.o
+
+//usage:#define pwd_trivial_usage
+//usage: ""
+//usage:#define pwd_full_usage "\n\n"
+//usage: "Print the full filename of the current working directory"
+//usage:
+//usage:#define pwd_example_usage
+//usage: "$ pwd\n"
+//usage: "/root\n"
+
+#include "libbb.h"
+
+static int logical_getcwd(void)
{
- char buf[BUFSIZ + 1];
+ struct stat st1;
+ struct stat st2;
+ char *wd;
+ char *p;
+
+ wd = getenv("PWD");
+ if (!wd || wd[0] != '/')
+ return 0;
+
+ p = wd;
+ while (*p) {
+ /* doing strstr(p, "/.") by hand is smaller and faster... */
+ if (*p++ != '/')
+ continue;
+ if (*p != '.')
+ continue;
+ /* we found "/.", skip to next char */
+ p++;
+ if (*p == '.')
+ p++; /* we found "/.." */
+ if (*p == '\0' || *p == '/')
+ return 0; /* "/./" or "/../" component: bad */
+ }
+
+ if (stat(wd, &st1) != 0)
+ return 0;
+ if (stat(".", &st2) != 0)
+ return 0;
+ if (st1.st_ino != st2.st_ino)
+ return 0;
+ if (st1.st_dev != st2.st_dev)
+ return 0;
+
+ puts(wd);
+ return 1;
+}
+
+int pwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int pwd_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+ char *buf;
+
+ if (ENABLE_DESKTOP) {
+ /* TODO: assume -L if $POSIXLY_CORRECT? (coreutils does that)
+ * Rationale:
+ * POSIX requires a default of -L, but most scripts expect -P
+ */
+ unsigned opt = getopt32(argv, "LP");
+ if ((opt & 1) && logical_getcwd())
+ return fflush_all();
+ }
- if (argc > 1 && strcmp(argv[1], "--help") == 0)
- usage(pwd_usage);
+ buf = xrealloc_getcwd_or_warn(NULL);
- if (getcwd(buf, sizeof(buf)) == NULL)
- fatalError("%s\n", strerror(errno));
+ if (buf) {
+ puts(buf);
+ free(buf);
+ return fflush_all();
+ }
- printf("%s\n", buf);
- return(TRUE);
+ return EXIT_FAILURE;
}