1 files changed, 52 insertions, 0 deletions
diff --git a/libbb/xgetcwd.c b/libbb/xgetcwd.c
new file mode 100644
index 0000000..2746681
--- /dev/null
+++ b/libbb/xgetcwd.c
@@ -0,0 +1,52 @@
+/*
+ * xgetcwd.c -- return current directory with unlimited length
+ * Copyright (C) 1992, 1996 Free Software Foundation, Inc.
+ * Written by David MacKenzie <djm@gnu.ai.mit.edu>.
+ *
+ * Special function for busybox written by Vladimir Oleynik <vodz@usa.net>
+*/
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <limits.h>
+#include "libbb.h"
+
+/* Amount to increase buffer size by in each try. */
+#define PATH_INCR 32
+
+/* Return the current directory, newly allocated, arbitrarily long.
+   Return NULL and set errno on error.
+   If argument is not NULL (previous usage allocate memory), call free()
+*/
+
+char *
+xgetcwd (char *cwd)
+{
+  char *ret;
+  unsigned path_max;
+
+  errno = 0;
+  path_max = (unsigned) PATH_MAX;
+  path_max += 2;                /* The getcwd docs say to do this. */
+
+  if(cwd==0)
+	cwd = xmalloc (path_max);
+
+  errno = 0;
+  while ((ret = getcwd (cwd, path_max)) == NULL && errno == ERANGE) {
+      path_max += PATH_INCR;
+      cwd = xrealloc (cwd, path_max);
+      errno = 0;
+  }
+
+  if (ret == NULL) {
+      int save_errno = errno;
+      free (cwd);
+      errno = save_errno;
+      perror_msg("getcwd()");
+      return NULL;
+  }
+
+  return cwd;
+}