linux-kernel - [PATCH v2 1/4] perf config: Invert a if statement to reduce nesting in cmd

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Date:   Mon,  8 May 2017 20:07:30 +0900
From:   Taeung Song <treeze.taeung@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH v2 1/4] perf config: Invert a if statement to reduce nesting in cmd_config()

Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Taeung Song <treeze.taeung@...il.com>
---
 tools/perf/builtin-config.c | 44 +++++++++++++++++++++++---------------------
 1 file changed, 23 insertions(+), 21 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 80668fa..7545966 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -204,31 +204,33 @@ int cmd_config(int argc, const char **argv)
 		}
 		break;
 	default:
-		if (argc) {
-			for (i = 0; argv[i]; i++) {
-				char *var, *value;
-				char *arg = strdup(argv[i]);
-
-				if (!arg) {
-					pr_err("%s: strdup failed\n", __func__);
-					ret = -1;
-					break;
-				}
+		if (!argc) {
+			usage_with_options(config_usage, config_options);
+			break;
+		}
 
-				if (parse_config_arg(arg, &var, &value) < 0) {
-					free(arg);
-					ret = -1;
-					break;
-				}
+		for (i = 0; argv[i]; i++) {
+			char *var, *value;
+			char *arg = strdup(argv[i]);
 
-				if (value == NULL)
-					ret = show_spec_config(set, var);
-				else
-					ret = set_config(set, config_filename, var, value);
+			if (!arg) {
+				pr_err("%s: strdup failed\n", __func__);
+				ret = -1;
+				break;
+			}
+
+			if (parse_config_arg(arg, &var, &value) < 0) {
 				free(arg);
+				ret = -1;
+				break;
 			}
-		} else
-			usage_with_options(config_usage, config_options);
+
+			if (value == NULL)
+				ret = show_spec_config(set, var);
+			else
+				ret = set_config(set, config_filename, var, value);
+			free(arg);
+		}
 	}
 
 	perf_config_set__delete(set);
-- 
2.7.4