Esoteric zsh bug

[Zefram <A.Main@xxxxxxxxxxxxxxxxx>]

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A bit of maltreatment of zsh:

% cat >xyzzy.c
main(c,v)char**v;{execlp(*++v,0);}
^D
% cc xyzzy.c
% ./a.out zsh
zsh: segmentation fault  ./a.out zsh

zsh falls over if argc is 0, as does ksh, and bash, and csh, and tcsh, and sh.
Not to mention sed, cut, grep, and in fact just about anything that cares about
its command-line arguments.  If anyone is actually interested in making zsh
survive this, here's the patch:

      *** Src/init.c.old	Tue May 23 10:50:26 1995
      --- Src/init.c	Tue May 23 10:52:49 1995
      ***************
      *** 42,47 ****
      --- 42,48 ----
        void
        main(int argc, char **argv, char **envp)
        {
      +     static char *defargv[2] = {"zsh", (char *)NULL};
            char *zshname;
        
        #ifdef LC_ALL
      ***************
      *** 49,54 ****
      --- 50,57 ----
        #endif
            environ = envp;
            permalloc();
      +     if (!argc)
      + 	argv = defargv;
            if (!(zshname = strrchr(argv[0], '/')))
        	zshname = argv[0];
            else

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