fs_filelen

int fs_filelen(const struct fs_file *file, uint32_t *out_len)

Retrieves the current length of the specified open file.

Arguments

Argument	Description
file	Pointer to the file to query
out_len	On success, the number of bytes in the file gets written here

Returned values

• 0 on success
• FS error code on failure

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;
}