From 93c75d2bad341af383520409fd354dcff3f2c279 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Mon, 1 Oct 2018 17:20:35 +0200
Subject: grep: update from Plan 9

This change fixes a segfault in grep -e when no argument
has been provided. Thanks to Sean Hinchee for reporting
this issue.

Fixes #186.
---
 src/cmd/grep/main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'src/cmd/grep')

diff --git a/src/cmd/grep/main.c b/src/cmd/grep/main.c
index d37aeb10..a847d73f 100644
--- a/src/cmd/grep/main.c
+++ b/src/cmd/grep/main.c
@@ -5,7 +5,7 @@ char *validflags = "bchiLlnsv";
 void
 usage(void)
 {
-	fprint(2, "usage: grep [-%s] [-f file] [-e expr] [file ...]\n", validflags);
+	fprint(2, "usage: grep [-%s] [-e pattern] [-f patternfile] [file ...]\n", validflags);
 	exits("usage");
 }
 
@@ -31,12 +31,12 @@ main(int argc, char *argv[])
 	case 'e':
 		flags['e']++;
 		lineno = 0;
-		str2top(ARGF());
+		str2top(EARGF(usage()));
 		break;
 
 	case 'f':
 		flags['f']++;
-		filename = ARGF();
+		filename = EARGF(usage());
 		rein = Bopen(filename, OREAD);
 		if(rein == 0) {
 			fprint(2, "grep: can't open %s: %r\n", filename);
-- 
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