From 761599ae61b8c9dfc1af047e502f62cbb7e55e53 Mon Sep 17 00:00:00 2001
From: sin <sin@2f30.org>
Date: Thu, 4 Dec 2014 12:04:41 +0000
Subject: [PATCH] nl(1) should handle up to 1 file

---
 nl.1 |  2 +-
 nl.c | 18 ++++++++----------
 2 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/nl.1 b/nl.1
index c6e2ed5..61159b4 100644
--- a/nl.1
+++ b/nl.1
@@ -9,7 +9,7 @@ nl \- number lines
 .IR increment ]
 .RB [ \-s
 .IR separator ]
-.RI [ file ...]
+.RI [ file ]
 .SH DESCRIPTION
 .B nl
 reads each file in sequence and writes it to stdout with non\-empty lines
diff --git a/nl.c b/nl.c
index f21e133..44772ad 100644
--- a/nl.c
+++ b/nl.c
@@ -18,8 +18,7 @@ static regex_t preg;
 static void
 usage(void)
 {
-	eprintf("usage: %s [-b style] [-i increment] [-s sep] [FILE...]\n",
-			argv0);
+	eprintf("usage: %s [-b style] [-i increment] [-s sep] [file]\n", argv0);
 }
 
 int
@@ -27,7 +26,6 @@ main(int argc, char *argv[])
 {
 	FILE *fp;
 	char *r;
-	int ret = 0;
 
 	ARGBEGIN {
 	case 'b':
@@ -48,18 +46,18 @@ main(int argc, char *argv[])
 		usage();
 	} ARGEND;
 
+	if (argc > 1)
+		usage();
+
 	if (argc == 0) {
 		nl("<stdin>", stdin);
-	} else for (; argc > 0; argc--, argv++) {
-		if (!(fp = fopen(argv[0], "r"))) {
-			weprintf("fopen %s:", argv[0]);
-			ret = 1;
-			continue;
-		}
+	} else {
+		if (!(fp = fopen(argv[0], "r")))
+			eprintf("fopen %s:", argv[0]);
 		nl(argv[0], fp);
 		fclose(fp);
 	}
-	return ret;
+	return 0;
 }
 
 void