From: BangLang Huang <banglang.huang@foxmail.com>
Date: Fri, 24 Feb 2017 02:52:52 +0000 (+0800)
Subject: nvram: improve argument check when program start
X-Git-Tag: v17.01.5~176
X-Git-Url: http://git.openwrt.org/?p=openwrt%2Fopenwrt.git;a=commitdiff_plain;h=118a2ea0bcdfb3895dfdec9fe4b98be5325d6386

nvram: improve argument check when program start

print help message when argument count is less
than 2.

Signed-off-by: BangLang Huang <banglang.huang@foxmail.com>
(cherry picked from commit c7e2a6fe923dc86bab14d94ead322a045efca4c9)
---

diff --git a/package/utils/nvram/src/cli.c b/package/utils/nvram/src/cli.c
index 149d307474..538bdce648 100644
--- a/package/utils/nvram/src/cli.c
+++ b/package/utils/nvram/src/cli.c
@@ -155,15 +155,16 @@ int main( int argc, const char *argv[] )
 	int done = 0;
 	int i;
 
+	if( argc < 2 ) {
+		usage();
+		return 1;
+	}
+
 	/* Ugly... iterate over arguments to see whether we can expect a write */
-	for( i = 1; i < argc; i++ )
-		if( ( !strcmp(argv[i], "set")   && ++i < argc ) ||
-			( !strcmp(argv[i], "unset") && ++i < argc ) ||
-			!strcmp(argv[i], "commit") )
-		{
-			write = 1;
-			break;
-		}
+	if( ( !strcmp(argv[1], "set")  && 2 < argc ) ||
+		( !strcmp(argv[1], "unset") && 2 < argc ) ||
+		!strcmp(argv[1], "commit") )
+		write = 1;
 
 
 	nvram = write ? nvram_open_staging() : nvram_open_rdonly();