diff options
Diffstat (limited to 'libguile/gsubr.c')
-rw-r--r-- | libguile/gsubr.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/libguile/gsubr.c b/libguile/gsubr.c index 3b7315565..6123a0b1f 100644 --- a/libguile/gsubr.c +++ b/libguile/gsubr.c @@ -317,6 +317,45 @@ scm_i_gsubr_apply_list (SCM self, SCM args) } #undef FUNC_NAME +/* Apply SELF, a gsubr, to the arguments in ARGS. Missing optional + arguments are added, and rest arguments are consed into a list. */ +SCM +scm_i_gsubr_apply_array (SCM self, SCM *args, int nargs, int headroom) +#define FUNC_NAME "scm_i_gsubr_apply" +{ + unsigned int typ = SCM_GSUBR_TYPE (self); + long i, n = SCM_GSUBR_REQ (typ) + SCM_GSUBR_OPT (typ) + SCM_GSUBR_REST (typ); + + if (SCM_UNLIKELY (nargs < SCM_GSUBR_REQ (typ))) + scm_wrong_num_args (SCM_SUBR_NAME (self)); + + if (SCM_UNLIKELY (headroom < n - nargs)) + { + /* fallback on apply-list */ + SCM arglist = SCM_EOL; + while (nargs--) + arglist = scm_cons (args[nargs], arglist); + return scm_i_gsubr_apply_list (self, arglist); + } + + for (i = nargs; i < SCM_GSUBR_REQ (typ) + SCM_GSUBR_OPT (typ); i++) + args[i] = SCM_UNDEFINED; + + if (SCM_GSUBR_REST(typ)) + { + SCM rest = SCM_EOL; + /* fallback on apply-list */ + while (nargs-- >= n) + rest = scm_cons (args[nargs], rest); + args[n - 1] = rest; + } + else if (nargs > n) + scm_wrong_num_args (SCM_SUBR_NAME (self)); + + return gsubr_apply_raw (self, n, args); +} +#undef FUNC_NAME + #ifdef GSUBR_TEST /* A silly example, taking 2 required args, 1 optional, and |