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Skip flushing file if lfs_file_rawseek() doesn't change position

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Themba Dube
2020-12-24 14:05:46 -05:00
parent 1a59954ec6
commit 6bb4043154
1 changed files with 13 additions and 8 deletions
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21
lfs.c
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@@ -3048,14 +3048,6 @@ relocate:
static lfs_soff_t lfs_file_rawseek(lfs_t *lfs, lfs_file_t *file, static lfs_soff_t lfs_file_rawseek(lfs_t *lfs, lfs_file_t *file,
lfs_soff_t off, int whence) { lfs_soff_t off, int whence) {
#ifndef LFS_READONLY
// write out everything beforehand, may be noop if rdonly
int err = lfs_file_flush(lfs, file);
if (err) {
return err;
}
#endif
// find new pos // find new pos
lfs_off_t npos = file->pos; lfs_off_t npos = file->pos;
if (whence == LFS_SEEK_SET) { if (whence == LFS_SEEK_SET) {
@@ -3071,6 +3063,19 @@ static lfs_soff_t lfs_file_rawseek(lfs_t *lfs, lfs_file_t *file,
return LFS_ERR_INVAL; return LFS_ERR_INVAL;
} }
if (file->pos == npos) {
// noop - position has not changed
return npos;
}
#ifndef LFS_READONLY
// write out everything beforehand, may be noop if rdonly
int err = lfs_file_flush(lfs, file);
if (err) {
return err;
}
#endif
// update pos // update pos
file->pos = npos; file->pos = npos;
return npos; return npos;