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list-objects-filter-options: clean up use of ALLOC_GROW

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Introduce a new macro ALLOC_GROW_BY which automatically zeros the added
array elements and takes care of updating the nr value. Use the macro in
code introduced earlier in this patchset.

Signed-off-by: Matthew DeVore <matvore@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matthew DeVore 2019-06-27 15:54:13 -07:00 committed by Junio C Hamano
parent 489fc9ee71
commit 5a133e8a7f
2 changed files with 29 additions and 10 deletions
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22
cache.h
View File

@ -660,6 +660,9 @@ int daemonize(void);
* at least 'nr' entries; the number of entries currently allocated
* is 'alloc', using the standard growing factor alloc_nr() macro.
*
* Consider using ALLOC_GROW_BY instead of ALLOC_GROW as it has some
* added niceties.
*
* DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
*/
#define ALLOC_GROW(x, nr, alloc) \
@ -673,6 +676,25 @@ int daemonize(void);
} \
} while (0)
/*
* Similar to ALLOC_GROW but handles updating of the nr value and
* zeroing the bytes of the newly-grown array elements.
*
* DO NOT USE any expression with side-effect for any of the
* arguments.
*/
#define ALLOC_GROW_BY(x, nr, increase, alloc) \
do { \
if (increase) { \
size_t new_nr = nr + (increase); \
if (new_nr < nr) \
BUG("negative growth in ALLOC_GROW_BY"); \
ALLOC_GROW(x, new_nr, alloc); \
memset((x) + nr, 0, sizeof(*(x)) * (increase)); \
nr = new_nr; \
} \
} while (0)
/* Initialize and use the cache information */
struct lock_file;
void preload_index(struct index_state *index,

17
list-objects-filter-options.c
View File

@ -120,14 +120,12 @@ static int parse_combine_subfilter(
struct strbuf *subspec,
struct strbuf *errbuf)
{
size_t new_index = filter_options->sub_nr++;
size_t new_index = filter_options->sub_nr;
char *decoded;
int result;
ALLOC_GROW(filter_options->sub, filter_options->sub_nr,
filter_options->sub_alloc);
memset(&filter_options->sub[new_index], 0,
sizeof(*filter_options->sub));
ALLOC_GROW_BY(filter_options->sub, filter_options->sub_nr, 1,
filter_options->sub_alloc);
decoded = url_percent_decode(subspec->buf);
@ -255,13 +253,12 @@ int parse_list_objects_filter(
string_list_append(&filter_options->filter_spec, xstrdup("+"));
filter_spec_append_urlencode(filter_options, arg);
ALLOC_GROW(filter_options->sub, filter_options->sub_nr + 1,
filter_options->sub_alloc);
filter_options = &filter_options->sub[filter_options->sub_nr++];
memset(filter_options, 0, sizeof(*filter_options));
ALLOC_GROW_BY(filter_options->sub, filter_options->sub_nr, 1,
filter_options->sub_alloc);
parse_error = gently_parse_list_objects_filter(
filter_options, arg, &errbuf);
&filter_options->sub[filter_options->sub_nr - 1], arg,
&errbuf);
}
if (parse_error)
die("%s", errbuf.buf);