From 2d4a491737b2888211fb27150088148740cf3dbc Mon Sep 17 00:00:00 2001 From: Stefan Herbrechtsmeier Date: Fri, 17 Mar 2023 13:04:13 +0100 Subject: [PATCH] fs: fat: do not mangle short filenames Do not mangle lower or mixed case filenames which fit into the upper case 8.3 short filename. This ensures FAT standard compatible short filenames (SFN) to support systems without long filename (LFN) support like boot roms (ex. SFN BOOT.BIN instead of BOOT~1.BIN for LFN boot.bin). Signed-off-by: Stefan Herbrechtsmeier --- fs/fat/fat_write.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c index 00541ebc3a..413fc432eb 100644 --- a/fs/fat/fat_write.c +++ b/fs/fat/fat_write.c @@ -141,6 +141,8 @@ static int set_name(fat_itr *itr, const char *filename, char *shortname) if (!strcmp(buf, filename)) { ret = 1; goto out; + } else if (!strcasecmp(buf, filename)) { + goto out_ret; } /* Construct an indexed short name */ @@ -177,12 +179,13 @@ static int set_name(fat_itr *itr, const char *filename, char *shortname) if (find_directory_entry(itr, buf)) continue; - debug("chosen short name: %s\n", buf); - /* Each long name directory entry takes 13 characters. */ - ret = (strlen(filename) + 25) / 13; - goto out; + goto out_ret; } return -EIO; +out_ret: + debug("chosen short name: %s\n", buf); + /* Each long name directory entry takes 13 characters. */ + ret = (strlen(filename) + 25) / 13; out: memcpy(shortname, &dirent, SHORT_NAME_SIZE); return ret; -- 2.39.5