Re: Parse errors don't cause a non-zero exit code?

[Peter Stephenson <pws@xxxxxxx>]

Dan Nelson wrote:
> In the last episode (Mar 29), Dan Nelson said:
> > $ echo "'" > /tmp/test ; zsh -f /tmp/test ; echo $?
> > /tmp/test:2: unmatched '
> > 0
> > 
> > ksh93, ash, and bash all return non-zero here, and it looks like
> > http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag
> _02_08
> > wants a non-zero result also.
> 
> I'm thinking something like this, but I don't know enough about zsh
> internals to say that propagating errflag into lastval here is the
> right fix.  It doesn't break the testsuite at least:

I came up with this.  It uses the LEXERR to signal the error rather than
propagating errflag.

I found there was another case which still didn't return non-zero
status, when the same code came from stdin.  That needed handling at the
next level down.

I've added tests for both.

Index: Src/init.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/init.c,v
retrieving revision 1.49
diff -u -r1.49 init.c
--- Src/init.c	31 Mar 2005 09:54:59 -0000	1.49
+++ Src/init.c	1 Apr 2005 10:02:41 -0000
@@ -131,6 +131,8 @@
 		(tok == LEXERR && (!isset(SHINSTDIN) || !toplevel)) ||
 		justonce)
 		break;
+	    if (tok == LEXERR && !lastval)
+		lastval = 1;
 	    continue;
 	}
 	if (hend(prog)) {
@@ -1282,6 +1284,9 @@
 	    loop(1,0);
 	while (tok != ENDINPUT && (tok != LEXERR || isset(SHINSTDIN)));
 	if (tok == LEXERR) {
+	    /* Make sure a parse error exits with non-zero status */
+	    if (!lastval)
+		lastval = 1;
 	    stopmsg = 1;
 	    zexit(lastval, 0);
 	}
Index: Test/A01grammar.ztst
===================================================================
RCS file: /cvsroot/zsh/zsh/Test/A01grammar.ztst,v
retrieving revision 1.9
diff -u -r1.9 A01grammar.ztst
--- Test/A01grammar.ztst	22 Jun 2004 13:10:02 -0000	1.9
+++ Test/A01grammar.ztst	1 Apr 2005 10:02:41 -0000
@@ -7,6 +7,7 @@
   mkdir basic.tmp && cd basic.tmp
 
   touch foo bar
+  echo "'" >unmatched_quote.txt
 
 %test
 #
@@ -439,3 +440,11 @@
   done || print no
 0:Handling of &&'s and ||'s with a for loop in between
 >no
+
+  $ZTST_testdir/../Src/zsh -f unmatched_quote.txt
+1:Parse error with file causes non-zero exit status
+?unmatched_quote.txt:2: unmatched '
+
+  $ZTST_testdir/../Src/zsh -f <unmatched_quote.txt
+1:Parse error on standard input causes non-zero exit status
+?zsh: unmatched '

-- 
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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