1 files changed, 41 insertions, 0 deletions
diff --git a/libbb/xgetcwd.c b/libbb/xgetcwd.c
new file mode 100644
index 0000000..eefe1d6
--- /dev/null
+++ b/libbb/xgetcwd.c
@@ -0,0 +1,41 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * 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 <dzo@simtreas.ru>
+*/
+
+#include "libbb.h"
+
+/* 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* FAST_FUNC
+xrealloc_getcwd_or_warn(char *cwd)
+{
+#define PATH_INCR 64
+
+	char *ret;
+	unsigned path_max;
+
+	path_max = 128;	/* 128 + 64 should be enough for 99% of cases */
+
+	while (1) {
+		path_max += PATH_INCR;
+		cwd = xrealloc(cwd, path_max);
+		ret = getcwd(cwd, path_max);
+		if (ret == NULL) {
+			if (errno == ERANGE)
+				continue;
+			free(cwd);
+			bb_perror_msg("getcwd");
+			return NULL;
+		}
+		cwd = xrealloc(cwd, strlen(cwd) + 1);
+		return cwd;
+	}
+}