From 97ee3e9f9865ac8ad10e92ced073f905d61e75d7 Mon Sep 17 00:00:00 2001
From: Jacob Evan Shreve <jacob@shreve.io>
Date: Fri, 20 Sep 2019 01:01:52 -0400
Subject: [PATCH] Accept EOF as well as newline to complete line read

Currently a line isn't read if any error is reached, including EAGAIN,
which indicates you've reached the end of a file descriptor.

This commit allows EAGAIN to terminate a line if anything else has been
read from that fd. If nothing else has been read, it's either
non-existent or empty, which makes sense to error instead.
---
 line.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/line.c b/line.c
index 5cf738e5..646e1156 100644
--- a/line.c
+++ b/line.c
@@ -37,8 +37,13 @@ static ssize_t line_gets(int fd, char *buf, size_t size)
 			return -ENOSPC;
 
 		err = line_getc(fd, buf + len);
-		if (err)
+		if (err) {
+			if (err == -EAGAIN && len > 0) {
+				len++;
+				break;
+			}
 			return err;
+		}
 
 		if (buf[len++] == '\n')
 			break;