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- /*-
- * Copyright (c) 1982, 1986, 1991 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * from: @(#)tty_subr.c 7.7 (Berkeley) 5/9/91
- */
-
- #include "param.h"
- #include "systm.h"
- #include "buf.h"
- #include "ioctl.h"
- #include "tty.h"
- #include "clist.h"
-
- /*
- * Initialize clists.
- */
- cinit()
- {
-
- /*
- * Body deleted.
- */
- }
-
- /*
- * Get a character from a clist.
- */
- getc(clp)
- struct clist *clp;
- {
- char c;
-
- /*
- * Body deleted.
- */
- return (c);
- }
-
- /*
- * Copy clist to buffer.
- * Return number of bytes moved.
- */
- q_to_b(clp, cp, count)
- struct clist *clp;
- char *cp;
- int count;
- {
- int s, moved = 0;
-
- if (count <= 0)
- return (0);
- s = spltty();
- /*
- * Body deleted.
- */
- splx(s);
- return (moved);
- }
-
- /*
- * Return count of contiguous characters in clist.
- * Stop counting if flag&character is non-null.
- */
- ndqb(clp, flag)
- struct clist *clp;
- int flag;
- {
- int count = 0;
- int s;
-
- s = spltty();
- /*
- * Body deleted.
- */
- splx(s);
- return (count);
- }
-
- /*
- * Flush count bytes from clist.
- */
- ndflush(clp, count)
- struct clist *clp;
- int count;
- {
- int s;
-
- s = spltty();
- /*
- * Body deleted.
- */
- splx(s);
- }
-
- /*
- * Put a character into the output queue.
- */
- putc(c, clp)
- char c;
- struct clist *clp;
- {
- int s, error = 0;
-
- s = spltty();
- /*
- * Body deleted.
- */
- if (error) {
- splx(s);
- return (-1);
- }
- splx(s);
- return (0);
- }
-
- /*
- * Copy buffer to clist.
- * Return number of bytes not transfered.
- */
- b_to_q(cp, count, clp)
- char *cp;
- int count;
- struct clist *clp;
- {
- int s, resid;
-
- if (count <= 0)
- return (0);
- resid = count;
- s = spltty();
- /*
- * Body deleted.
- */
- splx(s);
- return (resid);
- }
-
- /*
- * Given a non-NULL pointer into the clist return the pointer
- * to the next character in the list or return NULL if no more chars.
- *
- * Callers must not allow getc's to happen between nextc's so that the
- * pointer becomes invalid. Note that interrupts are NOT masked.
- */
- char *
- nextc(clp, cp, count)
- struct clist *clp;
- char *cp;
- int *count;
- {
- int empty = 0;
-
- /*
- * Body deleted.
- */
- if (!empty)
- return (cp);
- return (0);
- }
-
- /*
- * Remove the last character in the clist and return it.
- */
- unputc(clp)
- struct clist *clp;
- {
- char c;
- int s;
-
- s = spltty();
- /*
- * Body deleted.
- */
- splx(s);
- return (c);
- }
-
- /*
- * Put the chars in the from queue on the end of the to queue.
- */
- catq(from, to)
- struct clist *from, *to;
- {
- char c;
-
- while ((c = getc(from)) >= 0)
- putc(c, to);
- }
-