[PATCH V3 1/2] mkfs.f2fs: avoid dumplicate extensions

[Sheng Yong <shengyong1@huawei.com>]

Before copying an user specified extension to extension_list, check if it
is already in the list. User specified extensions are delimitted by token
either ',' or ' '.

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
---
 mkfs/f2fs_format.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index 176bdea..a29d7ef 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -118,6 +118,19 @@ const char *media_ext_lists[] = {
 	NULL
 };
 
+static bool is_extension_exist(const char *name)
+{
+	int i;
+
+	for (i = 0; i < F2FS_MAX_EXTENSION; i++) {
+		char *ext = (char *)sb.extension_list[i];
+		if (!strcmp(ext, name))
+			return 1;
+	}
+
+	return 0;
+}
+
 static void configure_extension_list(void)
 {
 	const char **extlist = media_ext_lists;
@@ -141,11 +154,12 @@ static void configure_extension_list(void)
 		return;
 
 	/* add user ext list */
-	ue = strtok(ext_str, ",");
+	ue = strtok(ext_str, ", ");
 	while (ue != NULL) {
 		name_len = strlen(ue);
-		memcpy(sb.extension_list[i++], ue, name_len);
-		ue = strtok(NULL, ",");
+		if (!is_extension_exist(ue))
+			memcpy(sb.extension_list[i++], ue, name_len);
+		ue = strtok(NULL, ", ");
 		if (i >= F2FS_MAX_EXTENSION)
 			break;
 	}
-- 
1.9.1


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