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-rw-r--r--erts/emulator/beam/erl_bits.c14
-rw-r--r--erts/emulator/test/bs_construct_SUITE.erl21
2 files changed, 26 insertions, 9 deletions
diff --git a/erts/emulator/beam/erl_bits.c b/erts/emulator/beam/erl_bits.c
index 88d2c06246..6f8a7436d5 100644
--- a/erts/emulator/beam/erl_bits.c
+++ b/erts/emulator/beam/erl_bits.c
@@ -555,10 +555,11 @@ fmt_int(byte *buf, Uint sz, Eterm val, Uint size, Uint flags)
{
unsigned long offs;
- ASSERT(size != 0);
offs = BIT_OFFSET(size);
if (is_small(val)) {
Sint v = signed_val(val);
+
+ ASSERT(size != 0); /* Tested by caller */
if (flags & BSF_LITTLE) { /* Little endian */
sz--;
COPY_VAL(buf,1,v,sz);
@@ -578,6 +579,9 @@ fmt_int(byte *buf, Uint sz, Eterm val, Uint size, Uint flags)
ErtsDigit* dp = big_v(val);
int n = MIN(sz,ds);
+ if (size == 0) {
+ return 0;
+ }
if (flags & BSF_LITTLE) {
sz -= n; /* pad with this amount */
if (sign) {
@@ -729,15 +733,13 @@ erts_new_bs_put_integer(ERL_BITS_PROTO_3(Eterm arg, Uint num_bits, unsigned flag
Uint b;
byte *iptr;
- if (num_bits == 0) {
- return 1;
- }
-
bit_offset = BIT_OFFSET(bin_offset);
if (is_small(arg)) {
Uint rbits = 8 - bit_offset;
- if (bit_offset + num_bits <= 8) {
+ if (num_bits == 0) {
+ return 1;
+ } else if (bit_offset + num_bits <= 8) {
/*
* All bits are in the same byte.
*/
diff --git a/erts/emulator/test/bs_construct_SUITE.erl b/erts/emulator/test/bs_construct_SUITE.erl
index 3d9b51d278..138a19a626 100644
--- a/erts/emulator/test/bs_construct_SUITE.erl
+++ b/erts/emulator/test/bs_construct_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1999-2009. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -27,7 +27,7 @@
mem_leak/1, coerce_to_float/1, bjorn/1,
huge_float_field/1, huge_binary/1, system_limit/1, badarg/1,
copy_writable_binary/1, kostis/1, dynamic/1, bs_add/1,
- otp_7422/1]).
+ otp_7422/1, zero_width/1]).
-include("test_server.hrl").
@@ -36,7 +36,7 @@ all(suite) ->
not_used, in_guard, mem_leak, coerce_to_float, bjorn,
huge_float_field, huge_binary, system_limit, badarg,
copy_writable_binary, kostis, dynamic, bs_add,
- otp_7422].
+ otp_7422, zero_width].
big(1) ->
57285702734876389752897683.
@@ -786,5 +786,20 @@ otp_7422_bin(N) when N < 512 ->
end),
otp_7422_bin(N+1);
otp_7422_bin(_) -> ok.
+
+zero_width(Config) when is_list(Config) ->
+ ?line Z = id(0),
+ Small = id(42),
+ Big = id(1 bsl 128),
+ ?line <<>> = <<Small:Z>>,
+ ?line <<>> = <<Small:0>>,
+ ?line <<>> = <<Big:Z>>,
+ ?line <<>> = <<Big:0>>,
+
+ ?line {'EXIT',{badarg,_}} = (catch <<not_a_number:0>>),
+ ?line {'EXIT',{badarg,_}} = (catch <<(id(not_a_number)):Z>>),
+ ?line {'EXIT',{badarg,_}} = (catch <<(id(not_a_number)):0>>),
+
+ ok.
id(I) -> I.