claenups for previous commit

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

diff --git a/coreutils/pwd.c b/coreutils/pwd.c
index 893ed1e15cd6f338f4d012ab36a83997dc4b4a18..345d8510045ba054a76edd2ca49c7fdb645c298c 100644 (file)
--- a/coreutils/pwd.c
+++ b/coreutils/pwd.c
@@ -1,18 +1,93 @@
-#include "internal.h"
-#include <stdio.h>
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini pwd implementation for busybox
+ *
+ * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+//config:config PWD
+//config:      bool "pwd (3.4 kb)"
+//config:      default y
+//config:      help
+//config:      pwd is used to print the current directory.
 
-const char     pwd_usage[] = "Print the current directory.\n";
+//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)
+{
+       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[1024];
+       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 ( getcwd(buf, sizeof(buf)) == NULL ) {
-               perror("get working directory");
-               exit( FALSE);
+       if (buf) {
+               puts(buf);
+               free(buf);
+               return fflush_all();
        }
 
-       printf("%s\n", buf);
-       exit( TRUE);
+       return EXIT_FAILURE;
 }