usr/src/sys/stand.att/write.c

/*-
 * Copyright (c) 1982, 1988, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.proprietary.c%
 *
 *      @(#)write.c     8.1 (Berkeley) %G%
 */

#include <sys/param.h>

#include <stand.att/saio.h>

#ifndef SMALL
write(fdesc, buf, count)
        int fdesc, count;
        char *buf;
{
        register i;
        register struct iob *file;

        errno = 0;
        if (fdesc >= 0 && fdesc <= 2) {
                i = count;
                while (i--)
                        putchar(*buf++);
                return (count);
        }
        fdesc -= 3;
        if (fdesc < 0 || fdesc >= SOPEN_MAX ||
            ((file = &iob[fdesc])->i_flgs&F_ALLOC) == 0) {
                errno = EBADF;
                return (-1);
        }
        if ((file->i_flgs&F_WRITE) == 0) {
                errno = EBADF;
                return (-1);
        }
        file->i_cc = count;
        file->i_ma = buf;
        file->i_bn = file->i_boff + (file->i_offset / DEV_BSIZE);
        i = devwrite(file);
        file->i_offset += count;
        if (i < 0)
                errno = file->i_error;
        return (i);
}
#endif