The exit status of a case statement where none of the patterns is matched

is supposed to be 0, not the status of the previous command.

Reported by:	Eygene Ryabinkin
PR:		116559
Approved by:	re (gnn)

bin/sh/eval.c

@@ -367,6 +367,7 @@ evalcase(union node *n, int flags)
 	setstackmark(&smark);
 	arglist.lastp = &arglist.list;
 	oexitstatus = exitstatus;
+	exitstatus = 0;
 	expandarg(n->ncase.expr, &arglist, EXP_TILDE);
 	for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
 		for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {

bin/sh/sh.1

@@ -861,6 +861,10 @@ described later),
 separated by
 .Dq Li \&|
 characters.
+The exit code of the
+.Ic case
+command is the exit code of the last command executed in the list or
+zero if no patterns were matched.
 .Ss Grouping Commands Together
 Commands may be grouped by writing either
 .Bd -literal -offset indent

tools/regression/bin/sh/builtins/case1.0

@@ -0,0 +1,13 @@
+#$FreeBSD$
+f()
+{
+	false
+	case $1 in
+	foo) true ;;
+	bar) false ;;
+	esac
+}
+
+f foo || exit 1
+f bar && exit 1
+f quux || exit 1