[src/trunk]: src/usr.bin/make make(1): don't modify progname in usage

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/cc6fc7423392
branches:  trunk
changeset: 946053:cc6fc7423392
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Nov 14 21:55:22 2020 +0000

description:
make(1): don't modify progname in usage

diffstat:

 usr.bin/make/main.c |  12 +++++-------
 1 files changed, 5 insertions(+), 7 deletions(-)

diffs (38 lines):

diff -r 3e1de9f32665 -r cc6fc7423392 usr.bin/make/main.c
--- a/usr.bin/make/main.c       Sat Nov 14 21:29:44 2020 +0000
+++ b/usr.bin/make/main.c       Sat Nov 14 21:55:22 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: main.c,v 1.465 2020/11/14 18:36:27 rillig Exp $        */
+/*     $NetBSD: main.c,v 1.466 2020/11/14 21:55:22 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -109,7 +109,7 @@
 #include "trace.h"
 
 /*     "@(#)main.c     8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: main.c,v 1.465 2020/11/14 18:36:27 rillig Exp $");
+MAKE_RCSID("$NetBSD: main.c,v 1.466 2020/11/14 21:55:22 rillig Exp $");
 #if defined(MAKE_NATIVE) && !defined(lint)
 __COPYRIGHT("@(#) Copyright (c) 1988, 1989, 1990, 1993 "
            "The Regents of the University of California.  "
@@ -187,16 +187,14 @@
 MAKE_ATTR_DEAD static void
 usage(void)
 {
-       char *p;
-       if ((p = strchr(progname, '[')) != NULL)
-               *p = '\0';
+       size_t prognameLen = strcspn(progname, "[");
 
        (void)fprintf(stderr,
-"usage: %s [-BeikNnqrstWwX] \n"
+"usage: %.*s [-BeikNnqrstWwX] \n"
 "            [-C directory] [-D variable] [-d flags] [-f makefile]\n"
 "            [-I directory] [-J private] [-j max_jobs] [-m directory] [-T file]\n"
 "            [-V variable] [-v variable] [variable=value] [target ...]\n",
-           progname);
+           (int)prognameLen, progname);
        exit(2);
 }