Undeclared function arguments

[Rick 'Transputer' Stein]

I wonder if any of you gurus can comment on the following fragment of
code output from lex:

The function yyback has two arguments, but only one is typed in argument
the list.  Why does my C compiler or lint, for that matter, not complain?

yyback(p,m)
int *p;
{
	if (p==0)return(0);
	while(*p)
	{
	  if ( *p++ == 0 )return(1);
	}
	return(0);
}

I've compiled this fragment along with the body of lex.yy.c on many
machines and compilers (SGI/4D, HP9000, SUN/4, Inmos transputers with
3L,MSC 4.0, etc) and no errors have been generated.  Are undeclared
function arguments auto casted to pointers?

Thanks in advance.

+--------------------------+---------------------------------------+
| Rick 'Transputer' Stein  | uucp: ...{felix, zardoz}!dhw68k!stein |
| "Goddam digital confuser | MaBellnet: 714-786-7794 (H)           |
| technology..."           |            714-540-8900 (W)           |
| Disclaimer: These opinions are mine, not my employer's.          |
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