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Added lfs_file_truncate

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As a copy-on-write filesystem, the truncate function is a very nice
function to have, as it can take advantage of reusing the data already
written out to disk.
This commit is contained in:
Christopher Haster
2018-01-20 17:30:40 -06:00
parent 2ad435ed63
commit d88f0ac02f
4 changed files with 195 additions and 2 deletions
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5
lfs.h
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@@ -364,6 +364,11 @@ lfs_ssize_t lfs_file_write(lfs_t *lfs, lfs_file_t *file,
lfs_soff_t lfs_file_seek(lfs_t *lfs, lfs_file_t *file,
lfs_soff_t off, int whence);
// Truncates the size of the file to the specified size
//
// Returns a negative error code on failure.
int lfs_file_truncate(lfs_t *lfs, lfs_file_t *file, lfs_off_t size);
// Return the position of the file
//
// Equivalent to lfs_file_seek(lfs, file, 0, LFS_SEEK_CUR)