From 060dc4813d37e40f5a225c3b9058e093cf44d666 Mon Sep 17 00:00:00 2001
From: naddy <naddy@openbsd.org>
Date: Sun, 31 Jan 2021 14:23:05 +0000
Subject: [PATCH] replace fgetln(3) with getline(3) in sed

Partly from Johann Oskarsson for Illumos/FreeBSD.
ok millert@
---
 usr.bin/sed/main.c | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/usr.bin/sed/main.c b/usr.bin/sed/main.c
index a3b4e02c949..42179376c0c 100644
--- a/usr.bin/sed/main.c
+++ b/usr.bin/sed/main.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: main.c,v 1.41 2020/10/13 06:07:54 martijn Exp $	*/
+/*	$OpenBSD: main.c,v 1.42 2021/01/31 14:23:05 naddy Exp $	*/
 
 /*-
  * Copyright (c) 1992 Diomidis Spinellis.
@@ -252,15 +252,9 @@ again:
 			goto again;
 		}
 	case ST_FILE:
-		if ((p = fgetln(f, &len)) != NULL) {
+		if (getline(outbuf, outsize, f) != -1) {
+			p = *outbuf;
 			linenum++;
-			if (len >= *outsize) {
-				free(*outbuf);
-				*outsize = ROUNDLEN(len + 1);
-				*outbuf = xmalloc(*outsize);
-			}
-			memcpy(*outbuf, p, len);
-			(*outbuf)[len] = '\0';
 			if (linenum == 1 && p[0] == '#' && p[1] == 'n')
 				nflag = 1;
 			return (*outbuf);
@@ -344,7 +338,8 @@ mf_fgets(SPACE *sp, enum e_spflag spflag)
 	struct stat sb;
 	size_t len;
 	char dirbuf[PATH_MAX];
-	char *p;
+	static char *p;
+	static size_t psize;
 	int c, fd;
 	static int firstfile;
 
@@ -429,13 +424,13 @@ mf_fgets(SPACE *sp, enum e_spflag spflag)
 	 * We are here only when infile is open and we still have something
 	 * to read from it.
 	 *
-	 * Use fgetln so that we can handle essentially infinite input data.
-	 * Can't use the pointer into the stdio buffer as the process space
-	 * because the ungetc() can cause it to move.
+	 * Use getline() so that we can handle essentially infinite input
+	 * data.  The p and psize are static so each invocation gives
+	 * getline() the same buffer which is expanded as needed.
 	 */
-	p = fgetln(infile, &len);
-	if (ferror(infile))
-		error(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO));
+	len = getline(&p, &psize, infile);
+	if ((ssize_t)len == -1)
+		error(FATAL, "%s: %s", fname, strerror(errno));
 	if (len != 0 && p[len - 1] == '\n') {
 		sp->append_newline = 1;
 		len--;
-- 
2.20.1