Re: [PATCH 1/5] "diff --check" should affect exit status

@@ -1456,7 +1456,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
 	diff_free_filespec_data(two);
 }
 
-static int builtin_checkdiff(const char *name_a, const char *name_b,
+static void builtin_checkdiff(const char *name_a, const char *name_b,
 			     struct diff_filespec *one,
 			     struct diff_filespec *two, struct diff_options *o)
 {

@@ -1464,7 +1464,7 @@ static int builtin_checkdiff(const char *name_a, const char *name_b,
 	struct checkdiff_t data;
 
 	if (!two)
-		return 0;
+		return;
 
 	memset(&data, 0, sizeof(data));
 	data.xm.consume = checkdiff_consume;

@@ -1493,7 +1493,8 @@ static int builtin_checkdiff(const char *name_a, const char *name_b,
  free_and_return:
 	diff_free_filespec_data(one);
 	diff_free_filespec_data(two);
-	return data.status;
+	if (data.status)
+		DIFF_OPT_SET(o, CHECK_FAILED);
 }
 
 struct diff_filespec *alloc_filespec(const char *path)

@@ -2078,14 +2079,14 @@ static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
 	builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
 }
 
-static int run_checkdiff(struct diff_filepair *p, struct diff_options *o)
+static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
 {
 	const char *name;
 	const char *other;
 
 	if (DIFF_PAIR_UNMERGED(p)) {
 		/* unmerged */
-		return 0;
+		return;
 	}
 
 	name = p->one->path;

@@ -2094,7 +2095,7 @@ static int run_checkdiff(struct diff_filepair *p, struct diff_options *o)
 	diff_fill_sha1_info(p->one);
 	diff_fill_sha1_info(p->two);
 
-	return builtin_checkdiff(name, other, p->one, p->two, o);
+	builtin_checkdiff(name, other, p->one, p->two, o);
 }
 
 void diff_setup(struct diff_options *options)

@@ -2596,17 +2597,17 @@ static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
 	run_diffstat(p, o, diffstat);
 }
 
-static int diff_flush_checkdiff(struct diff_filepair *p,
+static void diff_flush_checkdiff(struct diff_filepair *p,
 		struct diff_options *o)
 {
 	if (diff_unmodified_pair(p))
-		return 0;
+		return;
 
 	if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
 	    (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
-		return 0; /* no tree diffs in patch format */
+		return; /* no tree diffs in patch format */
 
-	return run_checkdiff(p, o);
+	run_checkdiff(p, o);
 }
 
 int diff_queue_is_empty(void)

@@ -2725,19 +2726,16 @@ static int check_pair_status(struct diff_filepair *p)
 	}
 }
 
-static int flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
+static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
 {
 	int fmt = opt->output_format;
 
 	if (fmt & DIFF_FORMAT_CHECKDIFF)
-		return diff_flush_checkdiff(p, opt);
+		diff_flush_checkdiff(p, opt);
 	else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
 		diff_flush_raw(p, opt);
 	else if (fmt & DIFF_FORMAT_NAME)
 		write_name_quoted(p->two->path, stdout, opt->line_termination);
-
-	/* return value only matters with DIFF_FORMAT_CHECKDIFF */
-	return 0;
 }
 
 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)

@@ -2976,8 +2974,8 @@ void diff_flush(struct diff_options *options)
 			     DIFF_FORMAT_CHECKDIFF)) {
 		for (i = 0; i < q->nr; i++) {
 			struct diff_filepair *p = q->queue[i];
-			if (check_pair_status(p) && flush_one_pair(p, options))
-				DIFF_OPT_SET(options, CHECK_FAILED);
+			if (check_pair_status(p))
+				flush_one_pair(p, options);
 		}
 		separator++;
 	}