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  • uspace/lib/c/generic/vfs/vfs.c

    r79ae36dd r8fd04ba9  
    417417}
    418418
     419/** Read entire buffer.
     420 *
     421 * In face of short reads this function continues reading until either
     422 * the entire buffer is read or no more data is available (at end of file).
     423 *
     424 * @param fildes        File descriptor
     425 * @param buf           Buffer, @a nbytes bytes long
     426 * @param nbytes        Number of bytes to read
     427 *
     428 * @return              On success, positive number of bytes read.
     429 *                      On failure, negative error code from read().
     430 */
     431ssize_t read_all(int fildes, void *buf, size_t nbyte)
     432{
     433        ssize_t cnt = 0;
     434        size_t nread = 0;
     435        uint8_t *bp = (uint8_t *) buf;
     436
     437        do {
     438                bp += cnt;
     439                nread += cnt;
     440                cnt = read(fildes, bp, nbyte - nread);
     441        } while (cnt > 0 && (nbyte - nread - cnt) > 0);
     442
     443        if (cnt < 0)
     444                return cnt;
     445
     446        return nread + cnt;
     447}
     448
     449/** Write entire buffer.
     450 *
     451 * This function fails if it cannot write exactly @a len bytes to the file.
     452 *
     453 * @param fildes        File descriptor
     454 * @param buf           Data, @a nbytes bytes long
     455 * @param nbytes        Number of bytes to write
     456 *
     457 * @return              EOK on error, return value from write() if writing
     458 *                      failed.
     459 */
     460ssize_t write_all(int fildes, const void *buf, size_t nbyte)
     461{
     462        ssize_t cnt = 0;
     463        ssize_t nwritten = 0;
     464        const uint8_t *bp = (uint8_t *) buf;
     465
     466        do {
     467                bp += cnt;
     468                nwritten += cnt;
     469                cnt = write(fildes, bp, nbyte - nwritten);
     470        } while (cnt > 0 && ((ssize_t )nbyte - nwritten - cnt) > 0);
     471
     472        if (cnt < 0)
     473                return cnt;
     474
     475        if ((ssize_t)nbyte - nwritten - cnt > 0)
     476                return EIO;
     477
     478        return nbyte;
     479}
     480
    419481int fsync(int fildes)
    420482{
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