From d803989131e58c56aa5cf159fdf12ae20fe04197 Mon Sep 17 00:00:00 2001
From: Joshua Rogers <joshua@joshua.hu>
Date: Fri, 12 Jan 2024 01:17:56 +0700
Subject: [PATCH] An empty filename or directory is not allowed.

---
 Snake.nocomments.sh | 2 ++
 Snake.sh            | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/Snake.nocomments.sh b/Snake.nocomments.sh
index 8348943..1087ae8 100644
--- a/Snake.nocomments.sh
+++ b/Snake.nocomments.sh
@@ -1063,6 +1063,7 @@ done
 is_file() {
 local filename
 filename="$1"
+[[ -z "$filename" ]] && return 1
 [[ -v 'files["$filename"]' || ${#files["$filename"]} -gt 0 ]] && return 0
 [[ -v 'not_files["$filename"]' || ${#not_files["$filename"]} -gt 0 ]] && return 1
 ${s} test -s "$filename" && ${s} test -r "$filename" && ${s} test -f "$filename" && files["$filename"]=1 && return 0
@@ -1072,6 +1073,7 @@ return 1
 is_dir() {
 local dir_name
 dir_name="$1"
+[[ -z "$dir_name" ]] && return 1
 [[ -v 'folders["$dir_name"]' || ${#folders["$dir_name"]} -gt 0 ]] && return 0
 [[ -v 'not_folders["$dir_name"]' || ${#not_folders["$dir_name"]} -gt 0 ]] && return 1
 ${s} test -d "$dir_name" && ${s} test -r "$dir_name" && folders["$dir_name"]=1 && return 0
diff --git a/Snake.sh b/Snake.sh
index 2d97c61..b25eaf2 100755
--- a/Snake.sh
+++ b/Snake.sh
@@ -1785,6 +1785,8 @@ is_file() {
 
   filename="$1"
 
+  [[ -z "$filename" ]] && return 1
+
   [[ -v 'files["$filename"]' || ${#files["$filename"]} -gt 0 ]] && return 0
   [[ -v 'not_files["$filename"]' || ${#not_files["$filename"]} -gt 0 ]] && return 1
 
@@ -1800,6 +1802,8 @@ is_dir() {
 
   dir_name="$1"
 
+  [[ -z "$dir_name" ]] && return 1
+
   [[ -v 'folders["$dir_name"]' || ${#folders["$dir_name"]} -gt 0 ]] && return 0
   [[ -v 'not_folders["$dir_name"]' || ${#not_folders["$dir_name"]} -gt 0 ]] && return 1