[PATCH 1/9] sha1-array: provide oid_array_filter
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
Documentation/technical/api-oid-array.txt | 5 +++++
sha1-array.c | 17 +++++++++++++++++
sha1-array.h | 3 +++
3 files changed, 25 insertions(+)
diff --git a/Documentation/technical/api-oid-array.txt b/Documentation/technical/api-oid-array.txt
index 9febfb1d52..c97428c2c3 100644
--- a/Documentation/technical/api-oid-array.txt
+++ b/Documentation/technical/api-oid-array.txt
@@ -48,6 +48,11 @@ Functions
is not sorted, this function has the side effect of sorting
it.
+`oid_array_filter`::
+ Apply the callback function `want` to each entry in the array,
+ retaining only the entries for which the function returns true.
+ Preserve the order of the entries that are retained.
+
Examples
--------
diff --git a/sha1-array.c b/sha1-array.c
index 265941fbf4..d505a004bb 100644
--- a/sha1-array.c
+++ b/sha1-array.c
@@ -77,3 +77,20 @@ int oid_array_for_each_unique(struct oid_array *array,
}
return 0;
}
+
+void oid_array_filter(struct oid_array *array,
+ for_each_oid_fn want,
+ void *cb_data)
+{
+ unsigned nr = array->nr, src, dst;
+ struct object_id *oids = array->oid;
+
+ for (src = dst = 0; src < nr; src++) {
+ if (want(&oids[src], cb_data)) {
+ if (src != dst)
+ oidcpy(&oids[dst], &oids[src]);
+ dst++;
+ }
+ }
+ array->nr = dst;
+}
diff --git a/sha1-array.h b/sha1-array.h
index 232bf95017..55d016c4bf 100644
--- a/sha1-array.h
+++ b/sha1-array.h
@@ -22,5 +22,8 @@ int oid_array_for_each(struct oid_array *array,
int oid_array_for_each_unique(struct oid_array *array,
for_each_oid_fn fn,
void *data);
+void oid_array_filter(struct oid_array *array,
+ for_each_oid_fn want,
+ void *cbdata);
#endif /* SHA1_ARRAY_H */
--
2.19.0
Stefan Beller <sbeller@google.com>