From e557e5ae0229f096fce9435f891d304f7daa4e4a Mon Sep 17 00:00:00 2001
From: Armaan Bhojwani <me@armaanb.net>
Date: Wed, 3 Mar 2021 20:41:25 -0500
Subject: [PATCH] fortune: add more bad input checks

---
 fortune | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/fortune b/fortune
index a8589a5..cbf1984 100755
--- a/fortune
+++ b/fortune
@@ -16,8 +16,14 @@ a simple POSIX sh/awk implementation of fortune
 
 Exit codes:
   0    success
-  1    argument error
-  2    parse error'
+  1    generic error
+  2    argument parsing error'
+}
+
+parse_err() {
+  echo "$1"
+  $2
+  exit 2
 }
 
 DIR=${FORTUNEDIR:-"/usr/share/fortune/"}
@@ -45,22 +51,22 @@ while [ "$1" != "" ]; do
       exit
       ;;
     *)
-      echo "ERROR: unknown option \"$1\""
-      usage
-      exit 1
+      parse_err "ERROR: unknown option \"$1\"" usage
       ;;
   esac
   shift 2
 done
 
 [ "$MAXLENGTH" -lt "$MINLENGTH" ] && {
-  echo "ERROR: maximum length is less than minimum length"
-  exit 2
+  parse_err "ERROR: maximum length is less than minimum length"
 }
 
 [ -d "$FILE" ] && {
-  echo "ERROR: directory given, please provide a file or glob of files"
-  exit 2
+  parse_err "ERROR: directory given, please provide a file or glob of files"
+}
+
+[ "$(find $FILE -maxdepth 1 -print -quit 2> /dev/null)" ] || {
+  parse_err "ERROR: no such file or directory"
 }
 
 awk -v maxlen=$MAXLENGTH -v minlen=$MINLENGTH \
-- 
2.39.2