View Source

int  fs_setvbuf (FS_FILE    *p_file,

                 char       *p_buf,

                 int         mode,

                 fs_size_t   size);

File	Called from	Code enabled by
`fs_api.c`	Application	`FS_CFG_API_EN` and `FS_CFG_FILE_BUF_EN`

Assign buffer to a file.

p_file

Pointer to a file.

p_buf

Pointer to buffer.

mode

Buffer mode:

FS__IONBR

Unbuffered.

FS__IOFBF

Fully buffered.

size

Size of buffer, in octets.

-1, if an error occurs.

0, if no error occurs.

fs_setvbuf() must be used after a stream is opened but before any other operation is performed on stream.
size must be more than or equal to the size of one sector; it will be rounded DOWN to the nearest size of a multiple of full sectors.
Once a buffer is assigned to a file, a new buffer may not be assigned nor may the assigned buffer be removed. To change the buffer, the file should be closed and re-opened.
Upon power loss, any data stored in file buffers will be lost.