[PATCH v3 2/5] strvec: add a strvec_pushvec()

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Add a strvec_pushvec() function to concatenate two "struct strvec *"
together, and modify code added in 50d89ad6542 (submodule: use
argv_array instead of hand-building arrays, 2012-09-01) to use it. In
a subsequent commit we'll gain another API user.

This could also have been named strvec_concat()[1], but I opted to
make its name consistent with the strbuf_addbuf() function instead. We
only name these sorts of functions *_concat() in one instance:
parse_options_concat().

1. http://lore.kernel.org/git/30620e13-4509-1905-7644-9962b6adf9c5@gmail.com

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 strvec.c    | 8 ++++++++
 strvec.h    | 7 +++++++
 submodule.c | 4 +---
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/strvec.c b/strvec.c
index 61a76ce6cb9..54ed8427c13 100644
--- a/strvec.c
+++ b/strvec.c
@@ -56,6 +56,14 @@ void strvec_pushv(struct strvec *array, const char **items)
 		strvec_push(array, *items);
 }
 
+void strvec_pushvec(struct strvec *array, const struct strvec *items)
+{
+	int i;
+
+	for (i = 0; i < items->nr; i++)
+		strvec_push(array, items->v[i]);
+}
+
 void strvec_pop(struct strvec *array)
 {
 	if (!array->nr)
diff --git a/strvec.h b/strvec.h
index fdcad75b45b..9003bde2b7d 100644
--- a/strvec.h
+++ b/strvec.h
@@ -62,6 +62,13 @@ void strvec_pushl(struct strvec *, ...);
 /* Push a null-terminated array of strings onto the end of the array. */
 void strvec_pushv(struct strvec *, const char **);
 
+/**
+ * Push the contents of another "struct strvec *" onto the end of the
+ * array. Like strvec_pushv(), this is a convenience wrapper that
+ * calls strvec_push() in a loop.
+ */
+void strvec_pushvec(struct strvec *, const struct strvec *);
+
 /**
  * Remove the final element from the array. If there are no
  * elements in the array, do nothing.
diff --git a/submodule.c b/submodule.c
index 8e611fe1dbf..84b5f5dc0e0 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1606,7 +1606,6 @@ int fetch_populated_submodules(struct repository *r,
 			       int default_option,
 			       int quiet, int max_parallel_jobs)
 {
-	int i;
 	struct submodule_parallel_fetch spf = SPF_INIT;
 
 	spf.r = r;
@@ -1622,8 +1621,7 @@ int fetch_populated_submodules(struct repository *r,
 		die(_("index file corrupt"));
 
 	strvec_push(&spf.args, "fetch");
-	for (i = 0; i < options->nr; i++)
-		strvec_push(&spf.args, options->v[i]);
+	strvec_pushvec(&spf.args, options);
 	strvec_push(&spf.args, "--recurse-submodules-default");
 	/* default value, "--submodule-prefix" and its value are added later */
 
-- 
2.33.0.733.ga72a4f1c2e1