[PATCH 2/4] parse-options: factor out parse_options_count()

[René Scharfe <l.s.r@xxxxxx>]

Add a helper function to count the number of options (excluding the
final OPT_END()) and use it to simplify parse_options_dup() and
parse_options_concat().

Signed-off-by: René Scharfe <l.s.r@xxxxxx>
---
 parse-options-cb.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/parse-options-cb.c b/parse-options-cb.c
index 012e048856..db6f666ef7 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -159,16 +159,20 @@ int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 	return 0;
 }

+static size_t parse_options_count(const struct option *opt)
+{
+	size_t n = 0;
+
+	for (; opt && opt->type != OPTION_END; opt++)
+		n++;
+	return n;
+}
+
 struct option *parse_options_dup(const struct option *o)
 {
 	const struct option *orig = o;
 	struct option *opts;
-	int nr = 0;
-
-	while (o && o->type != OPTION_END) {
-		nr++;
-		o++;
-	}
+	size_t nr = parse_options_count(o);

 	ALLOC_ARRAY(opts, nr + 1);
 	COPY_ARRAY(opts, orig, nr);
@@ -180,12 +184,8 @@ struct option *parse_options_dup(const struct option *o)
 struct option *parse_options_concat(struct option *a, struct option *b)
 {
 	struct option *ret;
-	size_t i, a_len = 0, b_len = 0;
-
-	for (i = 0; a[i].type != OPTION_END; i++)
-		a_len++;
-	for (i = 0; b[i].type != OPTION_END; i++)
-		b_len++;
+	size_t a_len = parse_options_count(a);
+	size_t b_len = parse_options_count(b);

 	ALLOC_ARRAY(ret, st_add3(a_len, b_len, 1));
 	COPY_ARRAY(ret, a, a_len);
--
2.25.0