[src/trunk]: src/bin/ed add -S to disable ! commands.

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

details:   https://anonhg.NetBSD.org/src/rev/1a4476b2eda0
branches:  trunk
changeset: 831551:1a4476b2eda0
user:      christos <christos%NetBSD.org@localhost>
date:      Thu Apr 05 18:44:57 2018 +0000

description:
add -S to disable ! commands.

diffstat:

 bin/ed/ed.1   |  13 ++++++++++---
 bin/ed/main.c |  16 ++++++++++++----
 2 files changed, 22 insertions(+), 7 deletions(-)

diffs (113 lines):

diff -r e129b516330b -r 1a4476b2eda0 bin/ed/ed.1
--- a/bin/ed/ed.1       Thu Apr 05 16:31:54 2018 +0000
+++ b/bin/ed/ed.1       Thu Apr 05 18:44:57 2018 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: ed.1,v 1.31 2017/07/03 21:33:23 wiz Exp $
+.\"    $NetBSD: ed.1,v 1.32 2018/04/05 18:44:57 christos Exp $
 .\"    $OpenBSD: ed.1,v 1.42 2003/07/27 13:25:43 jmc Exp $
 .\"
 .\" Copyright (c) 1993 Andrew Moore, Talke Studio.
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd January 23, 2002
+.Dd April 23, 2002
 .Dt ED 1
 .Os
 .Sh NAME
@@ -34,7 +34,7 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl
-.Op Fl Esx
+.Op Fl ESsx
 .Op Fl p Ar string
 .Op Ar file
 .Sh DESCRIPTION
@@ -130,6 +130,12 @@
 .It Fl E
 Enables the use of extended regular expressions instead of the basic
 regular expressions that are normally used.
+.It Fl S
+Disables using of the
+.Dq !
+command (execuring a subshell).
+Intended to be used by batch jobs like
+.Xr patch 1 .
 .It Fl p Ar string
 Specifies a command prompt.
 This may be toggled on and off with the
@@ -955,6 +961,7 @@
 .Xr sed 1 ,
 .Xr sh 1 ,
 .Xr vi 1 ,
+.Xr patch 1 ,
 .Xr regex 3
 .Pp
 USD:09-10
diff -r e129b516330b -r 1a4476b2eda0 bin/ed/main.c
--- a/bin/ed/main.c     Thu Apr 05 16:31:54 2018 +0000
+++ b/bin/ed/main.c     Thu Apr 05 18:44:57 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: main.c,v 1.28 2016/03/02 19:11:28 christos Exp $       */
+/*     $NetBSD: main.c,v 1.29 2018/04/05 18:44:57 christos Exp $       */
 
 /* main.c: This file contains the main control and user-interface routines
    for the ed line editor. */
@@ -39,7 +39,7 @@
 #if 0
 static char *rcsid = "@(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp";
 #else
-__RCSID("$NetBSD: main.c,v 1.28 2016/03/02 19:11:28 christos Exp $");
+__RCSID("$NetBSD: main.c,v 1.29 2018/04/05 18:44:57 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -94,6 +94,7 @@
 int red = 0;                   /* if set, restrict shell/directory access */
 int ere = 0;                   /* if set, use extended regexes */
 int scripted = 0;              /* if set, suppress diagnostics */
+int secure = 0;                        /* is set, ! is not allowed */
 int sigflags = 0;              /* if set, signals received while mutex set */
 int sigactive = 0;             /* if set, signal handlers are enabled */
 
@@ -105,7 +106,7 @@
 const char *dps = "*";         /* default command-line prompt */
 
 
-static const char usage[] = "Usage: %s [-] [-sxE] [-p string] [name]\n";
+static const char usage[] = "Usage: %s [-] [-ESsx] [-p string] [name]\n";
 
 /* ed: line editor */
 int
@@ -118,7 +119,7 @@
 
        red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
 top:
-       while ((c = getopt(argc, argv, "p:sxE")) != -1)
+       while ((c = getopt(argc, argv, "p:sxES")) != -1)
                switch(c) {
                case 'p':                               /* set prompt */
                        prompt = optarg;
@@ -137,6 +138,9 @@
                case 'E':
                        ere = REG_EXTENDED;
                        break;
+               case 'S':                               /* ! is not allowed */
+                       secure = 1;
+                       break;
                default:
                        fprintf(stderr, usage, getprogname());
                        exit(1);
@@ -861,6 +865,10 @@
                printf("%ld\n", addr_cnt ? second_addr : addr_last);
                break;
        case '!':
+               if (secure) {
+                       seterrmsg("'!' not allowed");
+                       return ERR;
+               }
                if (addr_cnt > 0) {
                        seterrmsg("unexpected address");
                        return ERR;