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Fixed non-standard behaviour of rdwr streams

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Originally had two seperate positions for reading/writing,
but this is inconsistent with the the posix standard, which
has a single position for reading and writing.

Also added proper handling of when the file is dirty, just
added an internal flag for this state.

Also moved the entry out of the file struct, and rearranged
some members to clean things up.
This commit is contained in:
Christopher Haster
2017-04-23 23:39:50 -05:00
parent 287b54876e
commit 0406442253
4 changed files with 146 additions and 130 deletions
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14
lfs.h
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@@ -55,6 +55,7 @@ enum lfs_open_flags {
LFS_O_TRUNC = 0x080,
LFS_O_APPEND = 0x100,
LFS_O_SYNC = 0x200,
LFS_O_DIRTY = 0x10000,
};
enum lfs_whence_flags {
@@ -128,7 +129,6 @@ struct lfs_info {
// littlefs data structures
typedef struct lfs_entry {
lfs_block_t pair[2];
lfs_off_t off;
struct lfs_disk_entry {
@@ -145,14 +145,17 @@ typedef struct lfs_entry {
} lfs_entry_t;
typedef struct lfs_file {
struct lfs_entry entry;
int flags;
lfs_block_t pair[2];
lfs_off_t off;
lfs_block_t head;
lfs_size_t size;
uint32_t flags;
lfs_off_t pos;
lfs_off_t wpos;
lfs_block_t wblock;
lfs_off_t woff;
lfs_off_t rpos;
lfs_block_t rblock;
lfs_off_t roff;
} lfs_file_t;
@@ -172,7 +175,6 @@ typedef struct lfs_dir {
} lfs_dir_t;
typedef struct lfs_superblock {
lfs_block_t pair[2];
lfs_off_t off;
struct lfs_disk_superblock {