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(scm_cons_star): Don't modify the rest list, it belongs to

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the caller when cons* is reached through apply.
This commit is contained in:
Kevin Ryde 2005-04-22 23:18:59 +00:00
parent 01adf598d9
commit b906b056e4
1 changed files with 12 additions and 10 deletions
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22
libguile/list.c
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@ -109,7 +109,7 @@ SCM_DEFINE (scm_list, "list", 0, 0, 1,
#undef FUNC_NAME
SCM_DEFINE (scm_cons_star, "cons*", 1, 0, 1,
SCM_DEFINE (scm_cons_star, "cons*", 1, 0, 1,
(SCM arg, SCM rest),
"Like @code{list}, but the last arg provides the tail of the\n"
"constructed list, returning @code{(cons @var{arg1} (cons\n"
@ -119,18 +119,20 @@ SCM_DEFINE (scm_cons_star, "cons*", 1, 0, 1,
"Schemes and in Common LISP.")
#define FUNC_NAME s_scm_cons_star
{
SCM ret = SCM_EOL;
SCM *p = &ret;
SCM_VALIDATE_REST_ARGUMENT (rest);
if (!scm_is_null (rest))
for ( ; scm_is_pair (rest); rest = SCM_CDR (rest))
{
SCM prev = arg = scm_cons (arg, rest);
while (!scm_is_null (SCM_CDR (rest)))
{
prev = rest;
rest = SCM_CDR (rest);
}
SCM_SETCDR (prev, SCM_CAR (rest));
*p = scm_cons (arg, SCM_EOL);
p = SCM_CDRLOC (*p);
arg = SCM_CAR (rest);
}
return arg;
*p = arg;
return ret;
}
#undef FUNC_NAME