From 4472fd66d0067347e3123896ae1b33f8bd444d56 Mon Sep 17 00:00:00 2001
From: Cosimo Cecchi <cosimo@apple.com>
Date: Thu, 6 Jun 2024 17:24:07 +0000
Subject: [PATCH] lam: fail on I/O errors

I/O errors should be reported; however lam currently does not
disambiguate between EOF because end-of-file was reached and EOF because
an I/O error occurred.
This commit changes lam to exit with EX_IOERR when an I/O error occurs.

Reviewed by:	imp, allanjude
Sponsored by:	Apple Inc.
Differential Revision:	https://reviews.freebsd.org/D45437
---
 usr.bin/lam/lam.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/usr.bin/lam/lam.c b/usr.bin/lam/lam.c
index 68cb4b94657..2194ae7ab59 100644
--- a/usr.bin/lam/lam.c
+++ b/usr.bin/lam/lam.c
@@ -43,6 +43,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sysexits.h>
 #include <unistd.h>
 
 #define	MAXOFILES	20
@@ -212,6 +213,9 @@ gatherline(struct openfile *ip)
 	*p = '\0';
 	if (c == EOF) {
 		ip->eof = 1;
+		if (ferror(ip->fp)) {
+			err(EX_IOERR, NULL);
+		}
 		if (ip->fp == stdin)
 			fclose(stdin);
 		morefiles--;