fs_write

int fs_write(struct fs_file *file, const void *data, int len)

Writes the supplied data to the current offset of the specified file handle.

Arguments

Argument	Description
file	Pointer to the file to write to
data	The data to write
len	The number of bytes to write

Returned values

• 0 on success
• FS error code on failure

Notes

For files opened in append mode, the specified data is always written to the end.

Header file

#include "fs/fs.h"

Example

int
write_config(void)
{
    struct fs_file *file;
    int rc;

    /* If the file doesn't exist, create it.  If it does exist, truncate it to
     * zero bytes.
     */
    rc = fs_open("/settings/config.txt", FS_ACCESS_WRITE | FS_ACCESS_TRUNCATE,
                 &file);
    if (rc == 0) {
        /* Write 5 bytes of data to the file. */
        rc = fs_write(file, "hello", 5);
        if (rc == 0) {
            /* The file should now contain exactly five bytes. */
            assert(fs_filelen(file) == 5);
        }

        /* Close the file. */
        fs_close(file);
    }

    return rc == 0 ? 0 : -1;
}