parse_options: allocate a new array when concatenatingjk/parse-options-concat

In exactly one callers (builtin/revert.c), we build up the
options list dynamically from multiple arrays. We do so by
manually inserting "filler" entries into one array, and then
copying the other array into the allocated space.

This is tedious and error-prone, as you have to adjust the
filler any time the second array is modified (although we do
at least check and die() when the counts do not match up).

Instead, let's just allocate a new array.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

3 files changed, 22 insertions, 22 deletions

diff --git a/builtin/revert.c b/builtin/revert.c
index 56a2c36669..4e693808b1 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -76,7 +76,7 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 	const char * const * usage_str = revert_or_cherry_pick_usage(opts);
 	const char *me = action_name(opts);
 	int cmd = 0;
-	struct option options[] = {
+	struct option base_options[] = {
 		OPT_CMDMODE(0, "quit", &cmd, N_("end revert or cherry-pick sequence"), 'q'),
 		OPT_CMDMODE(0, "continue", &cmd, N_("resume revert or cherry-pick sequence"), 'c'),
 		OPT_CMDMODE(0, "abort", &cmd, N_("cancel revert or cherry-pick sequence"), 'a'),
@@ -91,13 +91,9 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 			N_("option for merge strategy"), option_parse_x),
 		{ OPTION_STRING, 'S', "gpg-sign", &opts->gpg_sign, N_("key-id"),
 		  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
-		OPT_END(),
-		OPT_END(),
-		OPT_END(),
-		OPT_END(),
-		OPT_END(),
-		OPT_END(),
+		OPT_END()
 	};
+	struct option *options = base_options;
 
 	if (opts->action == REPLAY_PICK) {
 		struct option cp_extra[] = {
@@ -108,8 +104,7 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 			OPT_BOOL(0, "keep-redundant-commits", &opts->keep_redundant_commits, N_("keep redundant, empty commits")),
 			OPT_END(),
 		};
-		if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra))
-			die(_("program error"));
+		options = parse_options_concat(options, cp_extra);
 	}
 
 	argc = parse_options(argc, argv, NULL, options, usage_str,
diff --git a/parse-options-cb.c b/parse-options-cb.c
index 239898d946..2d875202cd 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -117,19 +117,24 @@ int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
-int parse_options_concat(struct option *dst, size_t dst_size, struct option *src)
+struct option *parse_options_concat(struct option *a, struct option *b)
 {
-	int i, j;
-
-	for (i = 0; i < dst_size; i++)
-		if (dst[i].type == OPTION_END)
-			break;
-	for (j = 0; i < dst_size; i++, j++) {
-		dst[i] = src[j];
-		if (src[j].type == OPTION_END)
-			return 0;
-	}
-	return -1;
+	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++;
+
+	ALLOC_ARRAY(ret, st_add3(a_len, b_len, 1));
+	for (i = 0; i < a_len; i++)
+		ret[i] = a[i];
+	for (i = 0; i < b_len; i++)
+		ret[a_len + i] = b[i];
+	ret[a_len + b_len] = b[b_len]; /* final OPTION_END */
+
+	return ret;
 }
 
 int parse_opt_string_list(const struct option *opt, const char *arg, int unset)
diff --git a/parse-options.h b/parse-options.h
index ea4af92a51..78f8384c56 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -215,7 +215,7 @@ extern int parse_options_step(struct parse_opt_ctx_t *ctx,
 
 extern int parse_options_end(struct parse_opt_ctx_t *ctx);
 
-extern int parse_options_concat(struct option *dst, size_t, struct option *src);
+extern struct option *parse_options_concat(struct option *a, struct option *b);
 
 /*----- some often used options -----*/
 extern int parse_opt_abbrev_cb(const struct option *, const char *, int);