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patch 8.1.0802: negative index doesn't work for Blob

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Problem:    Negative index doesn't work for Blob.
Solution:   Make it work, add a test. (closes #3856)
This commit is contained in:
Bram Moolenaar 2019-01-24 12:31:44 +01:00
parent fb1199d934
commit a5be9b6248
5 changed files with 20 additions and 6 deletions
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6
src/blob.c
View File

@ -72,8 +72,12 @@ blob_copy(typval_T *from, typval_T *to)
int len = from->vval.v_blob->bv_ga.ga_len;
if (len > 0)
{
to->vval.v_blob->bv_ga.ga_data =
vim_memsave(from->vval.v_blob->bv_ga.ga_data, len);
if (to->vval.v_blob->bv_ga.ga_data == NULL)
len = 0;
}
to->vval.v_blob->bv_ga.ga_len = len;
}
return ret;
@ -112,7 +116,7 @@ blob_len(blob_T *b)
* Get byte "idx" in blob "b".
* Caller must check that "idx" is valid.
*/
char_u
int
blob_get(blob_T *b, int idx)
{
return ((char_u*)b->bv_ga.ga_data)[idx];

9
src/eval.c
View File

@ -4723,12 +4723,13 @@ eval_index(
}
else
{
// The resulting variable is a string of a single
// character. If the index is too big or negative the
// result is empty.
// The resulting variable is a byte value.
// If the index is too big or negative that is an error.
if (n1 < 0)
n1 = len + n1;
if (n1 < len && n1 >= 0)
{
int v = (int)blob_get(rettv->vval.v_blob, n1);
int v = blob_get(rettv->vval.v_blob, n1);
clear_tv(rettv);
rettv->v_type = VAR_NUMBER;

2
src/proto/blob.pro
View File

@ -6,7 +6,7 @@ int blob_copy(typval_T *from, typval_T *to);
void blob_free(blob_T *b);
void blob_unref(blob_T *b);
long blob_len(blob_T *b);
char_u blob_get(blob_T *b, int idx);
int blob_get(blob_T *b, int idx);
void blob_set(blob_T *b, int idx, char_u c);
int blob_equal(blob_T *b1, blob_T *b2);
int read_blob(FILE *fd, blob_T *blob);

7
src/testdir/test_blob.vim
View File

@ -95,6 +95,13 @@ func Test_blob_get()
call assert_equal(999, get(b, 5, 999))
call assert_equal(-1, get(b, -8))
call assert_equal(999, get(b, -8, 999))
call assert_equal(0x00, b[0])
call assert_equal(0x22, b[2])
call assert_equal(0x44, b[4])
call assert_equal(0x44, b[-1])
call assert_fails('echo b[5]', 'E979:')
call assert_fails('echo b[-8]', 'E979:')
endfunc
func Test_blob_to_string()

2
src/version.c
View File

@ -791,6 +791,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
802,
/**/
801,
/**/