[U-Boot] [PATCH v1] tools: mtk_image: replace strncpy(d, s, sizeof(d)) with snprintf()

[Andy Shevchenko]

Starting from version 8 the GCC, i.e. C compiler, starts complaining about
possible '\0' terminator loss or, as in this case, garbage copy.

In function ‘mtk_image_set_gen_header’,
    inlined from ‘mtk_image_set_header’ at tools/mtk_image.c:733:3:
tools/mtk_image.c:659:2: warning: ‘strncpy’ specified bound 12 equals destination size [-Wstringop-truncation]
  strncpy(hdr->boot.name, bootname, sizeof(hdr->boot.name));
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘mtk_brom_parse_imagename’,
    inlined from ‘mtk_image_check_params’ at tools/mtk_image.c:388:9:
tools/mtk_image.c:325:5: warning: ‘strncpy’ specified bound 32 equals destination size [-Wstringop-truncation]
     strncpy(lk_name, val, sizeof(lk_name));
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Replace it with snprintf() to tell compiler how much room we have in the
destination buffer for source string.

Fixes: 3b975a147c3c ("tools: MediaTek: add MTK boot header generation to mkimage")
Cc: Ryder Lee <ryder.lee at mediatek.com>
Cc: Weijie Gao <weijie.gao at mediatek.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
---
 tools/mtk_image.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/mtk_image.c b/tools/mtk_image.c
index 2706d2de32..2ca519483d 100644
--- a/tools/mtk_image.c
+++ b/tools/mtk_image.c
@@ -322,7 +322,7 @@ static int mtk_brom_parse_imagename(const char *imagename)
 				lk = val;
 
 			if (!strcmp(key, "lkname"))
-				strncpy(lk_name, val, sizeof(lk_name));
+				snprintf(lk_name, sizeof(lk_name), "%s", val);
 		}
 
 		if (next)
@@ -656,7 +656,7 @@ static void mtk_image_set_gen_header(void *ptr, off_t filesize,
 		bootname = SDMMC_BOOT_NAME;
 
 	/* Generic device header */
-	strncpy(hdr->boot.name, bootname, sizeof(hdr->boot.name));
+	snprintf(hdr->boot.name, sizeof(hdr->boot.name), "%s", bootname);
 	hdr->boot.version = cpu_to_le32(1);
 	hdr->boot.size = cpu_to_le32(sizeof(hdr->boot));
 
-- 
2.19.2