httpd: fix handling of range requests

[oweals/busybox.git] / coreutils / pwd.c

diff --git a/coreutils/pwd.c b/coreutils/pwd.c
index 9c5d70cef5fe5c500e70cbf4da4dbb42e8b74355..05dee497be028c9b8a1172419c32f49f0700d25c 100644 (file)
--- a/coreutils/pwd.c
+++ b/coreutils/pwd.c
@@ -4,40 +4,90 @@
  *
  * 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.
+
+//applet:IF_PWD(APPLET_NOFORK(pwd, pwd, BB_DIR_BIN, BB_SUID_DROP, pwd))
+
+//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)
+{
+       struct stat st1;
+       struct stat st2;
+       char *wd;
+       char *p;
 
-/* getopt not needed */
+       wd = getenv("PWD");
+       if (!wd || wd[0] != '/')
+               return 0;
 
-#include <stdio.h>
-#include <dirent.h>
-#include <errno.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include "busybox.h"
+       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;
 
-extern int pwd_main(int argc, char **argv)
+       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)
 {
-       static char *buf; 
-       
-       buf = xgetcwd(buf);
-       
-       if (buf != NULL) {
+       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();
+       }
+
+       buf = xrealloc_getcwd_or_warn(NULL);
+
+       if (buf) {
                puts(buf);
-               return EXIT_SUCCESS;
+               free(buf);
+               return fflush_all();
        }
+
        return EXIT_FAILURE;
 }