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-rw-r--r--erts/emulator/beam/bif.c68
1 files changed, 67 insertions, 1 deletions
diff --git a/erts/emulator/beam/bif.c b/erts/emulator/beam/bif.c
index 97c8114437..182129cd36 100644
--- a/erts/emulator/beam/bif.c
+++ b/erts/emulator/beam/bif.c
@@ -2917,7 +2917,73 @@ BIF_RETTYPE float_to_list_1(BIF_ALIST_1)
need = i*2;
hp = HAlloc(BIF_P, need);
BIF_RET(buf_to_intlist(&hp, fbuf, i, NIL));
- }
+}
+
+BIF_RETTYPE float_to_list_2(BIF_ALIST_2)
+{
+ const static int arity_two = make_arityval(2);
+ int decimals = SYS_DEFAULT_FLOAT_DECIMALS;
+ int compact = 0;
+ enum fmt_type_ {
+ FMT_LEGACY,
+ FMT_FIXED,
+ FMT_SCIENTIFIC
+ } fmt_type = FMT_LEGACY;
+ Eterm list = BIF_ARG_2;
+ Eterm arg;
+ int i;
+ Uint need;
+ Eterm* hp;
+ FloatDef f;
+ char fbuf[256];
+
+ /* check the arguments */
+ if (is_not_float(BIF_ARG_1))
+ goto badarg;
+
+ for(; is_list(list); list = CDR(list_val(list))) {
+ arg = CAR(list_val(list));
+ if (arg == am_compact) {
+ compact = 1;
+ continue;
+ } else if (is_tuple(arg)) {
+ Eterm* tp = tuple_val(arg);
+ if (*tp == arity_two && is_small(tp[2])) {
+ decimals = signed_val(tp[2]);
+ if (decimals > 0 && decimals < sizeof(fbuf) - 6 /* "X." ++ "e+YY" */)
+ switch (tp[1]) {
+ case am_decimals:
+ fmt_type = FMT_FIXED;
+ continue;
+ case am_scientific:
+ fmt_type = FMT_SCIENTIFIC;
+ continue;
+ }
+ }
+ }
+ goto badarg;
+ }
+ if (is_not_nil(list)) {
+ goto badarg;
+ }
+
+ GET_DOUBLE(BIF_ARG_1, f);
+
+ if (fmt_type == FMT_FIXED) {
+ if ((i = sys_double_to_chars_fast(f.fd, fbuf, sizeof(fbuf),
+ decimals, compact)) <= 0)
+ goto badarg;
+ } else {
+ if ((i = sys_double_to_chars_ext(f.fd, fbuf, sizeof(fbuf), decimals)) <= 0)
+ goto badarg;
+ }
+
+ need = i*2;
+ hp = HAlloc(BIF_P, need);
+ BIF_RET(buf_to_intlist(&hp, fbuf, i, NIL));
+badarg:
+ BIF_ERROR(BIF_P, BADARG);
+}
/**********************************************************************/