From NetBSD:

- parser.c: Fix prompting in old style backquote expansion. Fixes PR/2139
	    and many user complaints why the shell hangs in echo "`"
- eval.c:   Fix exitstatus invalid resetting in `if' statements were:
		if (exit 3); then
			echo foo $?
		else
			echo bar $?
		fi
	    printed 'bar 0' instead of bar 3
	    Return zero status if `else' clause is empty.

1 files changed, 48 insertions, 9 deletions

diff --git a/bin/sh/parser.c b/bin/sh/parser.c
index d70b3ebb9c3..41eed597ee3 100644
--- a/bin/sh/parser.c
+++ b/bin/sh/parser.c
@@ -1,4 +1,5 @@
-/*	$NetBSD: parser.c,v 1.27 1995/10/19 04:14:41 christos Exp $	*/
+/*	$OpenBSD: parser.c,v 1.3 1996/03/08 22:01:03 niklas Exp $	*/
+/*	$NetBSD: parser.c,v 1.28 1996/03/05 21:04:00 christos Exp $	*/
 
 /*-
  * Copyright (c) 1991, 1993
@@ -40,7 +41,7 @@
 #if 0
 static char sccsid[] = "@(#)parser.c	8.7 (Berkeley) 5/16/95";
 #else
-static char rcsid[] = "$NetBSD: parser.c,v 1.27 1995/10/19 04:14:41 christos Exp $";
+static char rcsid[] = "$NetBSD: parser.c,v 1.28 1996/03/05 21:04:00 christos Exp $";
 #endif
 #endif /* not lint */
 
@@ -1233,6 +1234,7 @@ parsebackq: {
 	struct jmploc jmploc;
 	struct jmploc *volatile savehandler;
 	int savelen;
+	int saveprompt;
 
 	savepbq = parsebackquote;
 	if (setjmp(jmploc.loc)) {
@@ -1260,17 +1262,42 @@ parsebackq: {
                 register c;
                 int savelen;
                 char *str;
+
  
                 STARTSTACKSTR(out);
-                while ((c = pgetc ()) != '`') {
-                       if (c == '\\') {
-                                c = pgetc ();
+		for (;;) {
+			if (needprompt) {
+				setprompt(2);
+				needprompt = 0;
+			}
+			switch (c = pgetc()) {
+			case '`':
+				goto done;
+
+			case '\\':
+                                if ((c = pgetc()) == '\n') {
+					plinno++;
+					if (doprompt)
+						setprompt(2);
+					else
+						setprompt(0);
+				}
                                 if (c != '\\' && c != '`' && c != '$'
                                     && (!dblquote || c != '"'))
                                         STPUTC('\\', out);
-                       }
-                       STPUTC(c, out);
+				break;
+
+			case '\n':
+				plinno++;
+				needprompt = doprompt;
+				break;
+
+			default:
+				break;
+			}
+			STPUTC(c, out);
                 }
+done:
                 STPUTC('\0', out);
                 savelen = out - stackblock();
                 if (savelen > 0) {
@@ -1285,9 +1312,21 @@ parsebackq: {
 	*nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
 	(*nlpp)->next = NULL;
 	parsebackquote = oldstyle;
+
+	if (oldstyle) {
+		saveprompt = doprompt;
+		doprompt = 0;
+	}
+
 	n = list(0);
-        if (!oldstyle && (readtoken() != TRP))
-                synexpect(TRP);
+
+	if (oldstyle)
+		doprompt = saveprompt;
+	else {
+		if (readtoken() != TRP)
+			synexpect(TRP);
+	}
+
 	(*nlpp)->n = n;
         if (oldstyle) {
 		/*