Re: Zsh 3 and ${1+"$@"} (Was: [GNU Autoconf 2.53] testsuite.log: 126 failures)

[Peter Stephenson <pws@csr.com>]

Peter Stephenson wrote:
> I think the problem you are running across is that with the option
> SH_WORD_SPLIT set (as it is for sh compatibility), you get this behaviour:
> 
> % set 'one two'
> % for arg in ${1+"$@"}; do echo $arg; done
> one
> two
> 
> whereas you expect `one two' on the same line.  This problem is still in
> zsh 4 --- inside another substitution, either it's splitting all words
> on spaces, or it's splitting none.

(For zsh-workers only.)

By the way, I'm sure this is horribly incomplete at best --- and
paramsubst() is too grotesque for me to understand it --- but, just so I
understand what is going on, what is the problem with (deliberately
expanded the context):

Index: Src/subst.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/subst.c,v
retrieving revision 1.30
diff --unified=10 -r1.30 subst.c
--- Src/subst.c	22 Feb 2002 17:28:06 -0000	1.30
+++ Src/subst.c	9 Apr 2002 11:27:09 -0000
@@ -1478,20 +1478,22 @@
 		val = dupstring(s);
 		/*
 		 * This is not good enough for sh emulation!  Sh would
 		 * split unquoted substrings, yet not split quoted ones
 		 * (except according to $@ rules); but this leaves the
 		 * unquoted substrings unsplit, and other code below
 		 * for spbreak splits even within the quoted substrings.
 		 */
 		multsub(&val, (aspar ? NULL : &aval), &isarr, NULL);
 		copied = 1;
+		if (spbreak == 1)
+		    spbreak = 0;
 	    }
 	    break;
 	case ':':
 	    if (*s != '=' && *s != Equals)
 		goto noclosebrace;
 	    vunset = 1;
 	    s++;
 	    /* Fall through */
 	case '=':
 	case Equals:

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 392070


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