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pkg/fatfs/fatfs_vfs: silence -Wcast-align

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The -Wcast-align warnings are false positives. Hence, document
the reason why unaligned accesses cannot occur and silence the
warning.
This commit is contained in:
Marian Buschsieweke 2021-11-04 16:23:54 +01:00
parent 79103d3156
commit 83f86d471b
No known key found for this signature in database
GPG Key ID: CB8E3238CE715A94
1 changed files with 22 additions and 8 deletions
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30
pkg/fatfs/fatfs_vfs/fatfs_vfs.c
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@ -118,10 +118,17 @@ static int _rename(vfs_mount_t *mountp, const char *from_path,
fatfs_abs_path_to));
}
static fatfs_file_desc_t * _get_fatfs_file_desc(vfs_file_t *f)
{
/* the private buffer is part of a union that also contains a
* void pointer, hence, it is naturally aligned */
return (fatfs_file_desc_t *)(uintptr_t)f->private_data.buffer;
}
static int _open(vfs_file_t *filp, const char *name, int flags, mode_t mode,
const char *abs_path)
{
fatfs_file_desc_t *fd = (fatfs_file_desc_t *)&filp->private_data.buffer[0];
fatfs_file_desc_t *fd = _get_fatfs_file_desc(filp);
fatfs_desc_t *fs_desc = (fatfs_desc_t *)filp->mp->private_data;
_build_abs_path(fs_desc, name);
@ -179,7 +186,7 @@ static int _open(vfs_file_t *filp, const char *name, int flags, mode_t mode,
static int _close(vfs_file_t *filp)
{
fatfs_file_desc_t *fd = (fatfs_file_desc_t *)filp->private_data.buffer;
fatfs_file_desc_t *fd = _get_fatfs_file_desc(filp);
DEBUG("fatfs_vfs.c: _close: private_data = %p\n", filp->mp->private_data);
@ -197,7 +204,7 @@ static int _close(vfs_file_t *filp)
static ssize_t _write(vfs_file_t *filp, const void *src, size_t nbytes)
{
fatfs_file_desc_t *fd = (fatfs_file_desc_t *)filp->private_data.buffer;
fatfs_file_desc_t *fd = _get_fatfs_file_desc(filp);
UINT bw;
@ -212,7 +219,7 @@ static ssize_t _write(vfs_file_t *filp, const void *src, size_t nbytes)
static ssize_t _read(vfs_file_t *filp, void *dest, size_t nbytes)
{
fatfs_file_desc_t *fd = (fatfs_file_desc_t *)filp->private_data.buffer;
fatfs_file_desc_t *fd = _get_fatfs_file_desc(filp);
UINT br;
@ -227,7 +234,7 @@ static ssize_t _read(vfs_file_t *filp, void *dest, size_t nbytes)
static off_t _lseek(vfs_file_t *filp, off_t off, int whence)
{
fatfs_file_desc_t *fd = (fatfs_file_desc_t *)filp->private_data.buffer;
fatfs_file_desc_t *fd = _get_fatfs_file_desc(filp);
FRESULT res;
off_t new_pos = 0;
@ -294,9 +301,16 @@ static int _fstat(vfs_file_t *filp, struct stat *buf)
return fatfs_err_to_errno(res);
}
static inline DIR * _get_DIR(vfs_DIR *d)
{
/* the private buffer is part of a union that also contains a
* void pointer, hence, it is naturally aligned */
return (DIR *)(uintptr_t)d->private_data.buffer;
}
static int _opendir(vfs_DIR *dirp, const char *dirname, const char *abs_path)
{
DIR *dir = (DIR *)&dirp->private_data.buffer;
DIR *dir = _get_DIR(dirp);
fatfs_desc_t *fs_desc = (fatfs_desc_t *)dirp->mp->private_data;
(void) abs_path;
@ -307,7 +321,7 @@ static int _opendir(vfs_DIR *dirp, const char *dirname, const char *abs_path)
static int _readdir(vfs_DIR *dirp, vfs_dirent_t *entry)
{
DIR *dir = (DIR *)&dirp->private_data.buffer[0];
DIR *dir = _get_DIR(dirp);
FILINFO fi;
FRESULT res = f_readdir(dir, &fi);
@ -328,7 +342,7 @@ static int _readdir(vfs_DIR *dirp, vfs_dirent_t *entry)
static int _closedir(vfs_DIR *dirp)
{
DIR *dir = (DIR *)&dirp->private_data.buffer[0];
DIR *dir = _get_DIR(dirp);
return fatfs_err_to_errno(f_closedir(dir));
}