/* pipe_write.c - pipe_write */

#include 

/*------------------------------------------------------------------------
 *  pipe_write  -  write one or more bytes of data to a pipe device
 *------------------------------------------------------------------------
 */
devcall pipe_write(
          struct dentry *devptr,        /* Entry in device switch table */
          char  *buff,                  /* Buffer for the bytes         */
          int32 count                   /* Count of bytes to write      */
        )
{
        int32   nbytes;                 /* Count of bytes written       */
        int32   retval;                 /* Return value from pipe_putc  */

        /* Ensure count is valid */

        if (count <= 0) {
                return SYSERR;
        }

        nbytes = 0;
        while(count > 0) {
                retval = pipe_putc(devptr, *buff++);
                if (retval == SYSERR) {
                        if (nbytes > 0) {
                                /* Report what has been written on this */
                                /*  call and SYSERR on next call        */
                                return nbytes;
                        } else {
                                return SYSERR;
                        }
                }
                nbytes++;
                count--;
        }
        return nbytes;
}