[PATCH 1/5] f2fs-tools: Fix various compilation warnings

[Damien Le Moal <damien.lemoal@wdc.com>]

Avoid various compilation warnings due to strncpy:

libf2fs.c:590:33: warning: ‘snprintf’ output may be truncated before
the last format character [-Wformat-truncation=]
  snprintf(rootdev, ret, "/dev/%s", buf);

../include/f2fs_fs.h:1384:2: warning: ‘strncpy’ specified bound
depends on the length of the source argument [-Wstringop-overflow=]
  strncpy(buf, features, strlen(features) + 1);

f2fstat.c:243:3: warning: ‘strncpy’ output truncated before
terminating nul copying as many bytes from a string as its length
[-Wstringop-truncation]
   strncpy(ptr_buf, name[i], strlen(name[i]));

This patch does not change any functionality.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
---
 include/f2fs_fs.h | 6 +++---
 lib/libf2fs.c     | 2 +-
 tools/f2fstat.c   | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index a730688..e073723 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -1379,9 +1379,9 @@ static inline int parse_feature(struct feature *table, const char *features)
 {
 	char *buf, *sub, *next;
 
-	buf = calloc(strlen(features) + 1, sizeof(char));
-	ASSERT(buf);
-	strncpy(buf, features, strlen(features) + 1);
+	buf = strdup(features);
+	if (!buf)
+		return -1;
 
 	for (sub = buf; sub && *sub; sub = next ? next + 1 : NULL) {
 		/* Skip the beginning blanks */
diff --git a/lib/libf2fs.c b/lib/libf2fs.c
index c692bf2..60b84e0 100644
--- a/lib/libf2fs.c
+++ b/lib/libf2fs.c
@@ -587,7 +587,7 @@ char *get_rootdev()
 		return NULL;
 	rootdev[ret] = '\0';
 
-	snprintf(rootdev, ret, "/dev/%s", buf);
+	snprintf(rootdev, ret + 1, "/dev/%s", buf);
 	return rootdev;
 #endif
 }
diff --git a/tools/f2fstat.c b/tools/f2fstat.c
index 7f485b0..0618806 100644
--- a/tools/f2fstat.c
+++ b/tools/f2fstat.c
@@ -240,7 +240,7 @@ void print_head(char *res)
 
 	for (i = 0; i < 20; i++) {
 		ptr = (i == 0) ? strtok(res, " ") : strtok(NULL, " ");
-		strncpy(ptr_buf, name[i], strlen(name[i]));
+		strcpy(ptr_buf, name[i]);
 		if (i == 1) {
 			prev_index = ptr_buf - buf - 1;
 		} else if (i == 7) {
-- 
2.20.1



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