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pc: remove -n option and check if stdin is cons instead

--- a/sys/man/1/pc

+++ b/sys/man/1/pc

@@ -16,11 +16,6 @@

 .I Pc

 prints the value of all expressions that are not terminated by a semicolon.

 .PP

-.I Pc

-can be run non-interactively by using the

-.B -n

-switch. In this case no input prompt is printed.

-.PP

 Expressions can use the C-like operators

 .TP

 .B + - * ** \fR(exponentiation\fR)

--- a/sys/src/cmd/pc.y

+++ b/sys/src/cmd/pc.y

@@ -1025,8 +1025,9 @@

 }

 void

-main(int argc, char **argv)

+main(int, char **)

 {

+	char buf[32];

 	Keyword *kw;

 	fmtinstall('B', mpfmt);

@@ -1056,13 +1057,10 @@

 	regfunc("rev", fnrev, 2);

 	regfunc("cat", fncat, -1);

-	prompt = 1;

-	ARGBEGIN{

-	case 'n': prompt = 0; break;

-	}ARGEND;

-	

+	prompt = fd2path(0, buf, sizeof buf) >= 0 && strstr(buf, "/dev/cons") != nil;

 	in = Bfdopen(0, OREAD);

-	if(in == nil) sysfatal("Bfdopen: %r");

+	if(in == nil)

+		sysfatal("Bfdopen: %r");

 	extern void yyparse(void);

 	yyparse();

 	extern int yynerrs;