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(length+): Rewrite using scm_ilength.

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This commit is contained in:
Kevin Ryde 2003-07-28 23:54:39 +00:00
parent 15d36a3438
commit de51f5955d
3 changed files with 13 additions and 13 deletions
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12
srfi/srfi-1.c
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@ -370,6 +370,18 @@ SCM_DEFINE (scm_srfi1_delete_duplicates_x, "delete-duplicates!", 1, 1, 0,
#undef FUNC_NAME #undef FUNC_NAME
SCM_DEFINE (scm_srfi1_length_plus, "length+", 1, 0, 0,
(SCM lst),
"Return the length of @var{lst}, or @code{#f} if @var{lst} is\n"
"circular.")
#define FUNC_NAME s_scm_srfi1_length_plus
{
long len = scm_ilength (lst);
return (len >= 0 ? SCM_MAKINUM (len) : SCM_BOOL_F);
}
#undef FUNC_NAME
/* Typechecking for multi-argument MAP and FOR-EACH. /* Typechecking for multi-argument MAP and FOR-EACH.
Verify that each element of the vector ARGV, except for the first, Verify that each element of the vector ARGV, except for the first,

1
srfi/srfi-1.h
View file

@ -36,6 +36,7 @@ SCM_SRFI1_API SCM scm_srfi1_delete (SCM x, SCM lst, SCM pred);
SCM_SRFI1_API SCM scm_srfi1_delete_x (SCM x, SCM lst, SCM pred); SCM_SRFI1_API SCM scm_srfi1_delete_x (SCM x, SCM lst, SCM pred);
SCM_SRFI1_API SCM scm_srfi1_delete_duplicates (SCM lst, SCM pred); SCM_SRFI1_API SCM scm_srfi1_delete_duplicates (SCM lst, SCM pred);
SCM_SRFI1_API SCM scm_srfi1_delete_duplicates_x (SCM lst, SCM pred); SCM_SRFI1_API SCM scm_srfi1_delete_duplicates_x (SCM lst, SCM pred);
SCM_SRFI1_API SCM scm_srfi1_length_plus (SCM lst);
SCM_SRFI1_API SCM scm_srfi1_map (SCM proc, SCM arg1, SCM args); SCM_SRFI1_API SCM scm_srfi1_map (SCM proc, SCM arg1, SCM args);
SCM_SRFI1_API SCM scm_srfi1_for_each (SCM proc, SCM arg1, SCM args); SCM_SRFI1_API SCM scm_srfi1_for_each (SCM proc, SCM arg1, SCM args);
SCM_SRFI1_API SCM scm_srfi1_member (SCM obj, SCM ls, SCM pred); SCM_SRFI1_API SCM scm_srfi1_member (SCM obj, SCM ls, SCM pred);

13
srfi/srfi-1.scm
View file

@ -414,19 +414,6 @@
;;; Miscelleneous: length, append, concatenate, reverse, zip & count ;;; Miscelleneous: length, append, concatenate, reverse, zip & count
(define (length+ clist)
(if (null? clist)
0
(let lp ((hare (cdr clist)) (tortoise clist) (l 1))
(if (null? hare)
l
(let ((hare (cdr hare)))
(if (null? hare)
(+ l 1)
(if (eq? hare tortoise)
#f
(lp (cdr hare) (cdr tortoise) (+ l 2)))))))))
(define (append-reverse rev-head tail) (define (append-reverse rev-head tail)
(let lp ((l rev-head) (acc tail)) (let lp ((l rev-head) (acc tail))
(if (null? l) (if (null? l)