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fs: fat: do not mangle short filenames

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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 <stefan.herbrechtsmeier@weidmueller.com>
This commit is contained in:
Stefan Herbrechtsmeier 2023-03-17 13:04:13 +01:00 committed by Tom Rini
parent 447dfbc063
commit fefd949157
1 changed files with 7 additions and 4 deletions
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9
fs/fat/fat_write.c
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@ -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;
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;
goto out;
}
return -EIO;
out:
memcpy(shortname, &dirent, SHORT_NAME_SIZE);
return ret;