From f4852f7b900387f363e44ead37e86686f9c6e304 Mon Sep 17 00:00:00 2001
From: kevin <kevin@larke.org>
Date: Sat, 14 May 2022 10:12:47 -0400
Subject: [PATCH] filesys.cpp: Add nullptr guards to isDir(), isFile(),
 isLink().

---
 cwFileSys.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/cwFileSys.cpp b/cwFileSys.cpp
index 5d5b8e8..7946109 100644
--- a/cwFileSys.cpp
+++ b/cwFileSys.cpp
@@ -63,6 +63,9 @@ bool cw::filesys::isDir( const char* dirStr )
 
   errno = 0;
 
+  if( dirStr == nullptr )
+    return false;
+
   if( stat(dirStr,&s)  != 0 )
   {
     // if the dir does not exist
@@ -81,6 +84,9 @@ bool cw::filesys::isFile( const char* fnStr )
   struct stat s;
   errno = 0;
 
+  if( fnStr == nullptr )
+    return false;
+  
   if( stat(fnStr,&s)  != 0 )
   {
 
@@ -101,6 +107,9 @@ bool cw::filesys::isLink( const char* fnStr )
   struct stat s;
   errno = 0;
 
+  if( fnStr == nullptr )
+    return false;
+
   if( lstat(fnStr,&s)  != 0 )
   {
     // if the file does not exist
@@ -314,6 +323,9 @@ char* cw::filesys::expandPath( const char* dir )
 
   memset(&res,0,sizeof(res));
 
+  if( dir == nullptr )
+    return nullptr;
+
   if((sysRC = wordexp(dir,&res,flags)) != 0)
   {
     switch(sysRC)