From b7acde90f39d5e2d895c5be79b1b33a1fddd864d Mon Sep 17 00:00:00 2001 From: Karl Heuer Date: Wed, 24 Jan 1996 23:44:22 +0000 Subject: [PATCH] (XCAR, XCDR, CAR, CDR): New macros. (make_number): New macro definition. --- src/lisp.h | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/src/lisp.h b/src/lisp.h index 61ead0907d3..9fe189f36f5 100644 --- a/src/lisp.h +++ b/src/lisp.h @@ -307,6 +307,11 @@ extern int pure_size; ((var) = ((EMACS_INT)(type) << VALBITS) + ((EMACS_INT) (ptr) & VALMASK)) #endif +/* Convert a C integer into a Lisp_Object integer. */ + +#define make_number(N) \ + ((((EMACS_INT) (N)) & VALMASK) | ((EMACS_INT) Lisp_Int) << VALBITS) + /* During garbage collection, XGCTYPE must be used for extracting types so that the mark bit is ignored. XMARKBIT accesses the markbit. Markbits are used only in particular slots of particular structure types. @@ -510,6 +515,21 @@ struct Lisp_Cons Lisp_Object car, cdr; }; +/* Take the car or cdr of something known to be a cons cell. */ +#define XCAR(c) (XCONS ((c))->car) +#define XCDR(c) (XCONS ((c))->cdr) + +/* Take the car or cdr of something whose type is not known. */ +#define CAR(c) \ + (CONSP ((c)) ? XCAR ((c)) \ + : NILP ((c)) ? Qnil \ + : wrong_type_argument (Qlistp, (c))) + +#define CDR(c) \ + (CONSP ((c)) ? XCDR ((c)) \ + : NILP ((c)) ? Qnil \ + : wrong_type_argument (Qlistp, (c))) + /* Like a cons, but records info on where the text lives that it was read from */ /* This is not really in use now */ @@ -1400,7 +1420,6 @@ extern Lisp_Object Flsh (), Fash (); extern Lisp_Object Fadd1 (), Fsub1 (); -extern Lisp_Object make_number (); extern Lisp_Object long_to_cons (); extern unsigned long cons_to_long (); extern void args_out_of_range (); -- 2.39.2