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Annotation of Net2/kern/tty_subr.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1982, 1986, 1991 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     from: @(#)tty_subr.c    7.7 (Berkeley) 5/9/91
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "systm.h"
        !            38: #include "buf.h"
        !            39: #include "ioctl.h"
        !            40: #include "tty.h"
        !            41: #include "clist.h"
        !            42: 
        !            43: /*
        !            44:  * Initialize clists.
        !            45:  */
        !            46: cinit()
        !            47: {
        !            48: 
        !            49:        /*
        !            50:         * Body deleted.
        !            51:         */
        !            52: }
        !            53: 
        !            54: /*
        !            55:  * Get a character from a clist.
        !            56:  */
        !            57: getc(clp)
        !            58:        struct clist *clp;
        !            59: {
        !            60:        char c;
        !            61: 
        !            62:        /*
        !            63:         * Body deleted.
        !            64:         */
        !            65:        return (c);
        !            66: }
        !            67: 
        !            68: /*
        !            69:  * Copy clist to buffer.
        !            70:  * Return number of bytes moved.
        !            71:  */
        !            72: q_to_b(clp, cp, count)
        !            73:        struct clist *clp;
        !            74:        char *cp;
        !            75:        int count;
        !            76: {
        !            77:        int s, moved = 0;
        !            78: 
        !            79:        if (count <= 0)
        !            80:                return (0);
        !            81:        s = spltty();
        !            82:        /*
        !            83:         * Body deleted.
        !            84:         */
        !            85:        splx(s);
        !            86:        return (moved);
        !            87: }
        !            88: 
        !            89: /*
        !            90:  * Return count of contiguous characters in clist.
        !            91:  * Stop counting if flag&character is non-null.
        !            92:  */
        !            93: ndqb(clp, flag)
        !            94:        struct clist *clp;
        !            95:        int flag;
        !            96: {
        !            97:        int count = 0;
        !            98:        int s;
        !            99: 
        !           100:        s = spltty();
        !           101:        /*
        !           102:         * Body deleted.
        !           103:         */
        !           104:        splx(s);
        !           105:        return (count);
        !           106: }
        !           107: 
        !           108: /*
        !           109:  * Flush count bytes from clist.
        !           110:  */
        !           111: ndflush(clp, count)
        !           112:        struct clist *clp;
        !           113:        int count;
        !           114: {
        !           115:        int s;
        !           116: 
        !           117:        s = spltty();
        !           118:        /*
        !           119:         * Body deleted.
        !           120:         */
        !           121:        splx(s);
        !           122: }
        !           123: 
        !           124: /*
        !           125:  * Put a character into the output queue.
        !           126:  */
        !           127: putc(c, clp)
        !           128:        char c;
        !           129:        struct clist *clp;
        !           130: {
        !           131:        int s, error = 0;
        !           132: 
        !           133:        s = spltty();
        !           134:        /*
        !           135:         * Body deleted.
        !           136:         */
        !           137:        if (error) {
        !           138:                splx(s);
        !           139:                return (-1);
        !           140:        }
        !           141:        splx(s);
        !           142:        return (0);
        !           143: }
        !           144: 
        !           145: /*
        !           146:  * Copy buffer to clist.
        !           147:  * Return number of bytes not transfered.
        !           148:  */
        !           149: b_to_q(cp, count, clp)
        !           150:        char *cp;
        !           151:        int count;
        !           152:        struct clist *clp;
        !           153: {
        !           154:        int s, resid;
        !           155: 
        !           156:        if (count <= 0)
        !           157:                return (0);
        !           158:        resid = count;
        !           159:        s = spltty();
        !           160:        /*
        !           161:         * Body deleted.
        !           162:         */
        !           163:        splx(s);
        !           164:        return (resid);
        !           165: }
        !           166: 
        !           167: /*
        !           168:  * Given a non-NULL pointer into the clist return the pointer
        !           169:  * to the next character in the list or return NULL if no more chars.
        !           170:  *
        !           171:  * Callers must not allow getc's to happen between nextc's so that the
        !           172:  * pointer becomes invalid.  Note that interrupts are NOT masked.
        !           173:  */
        !           174: char *
        !           175: nextc(clp, cp, count)
        !           176:        struct clist *clp;
        !           177:        char *cp;
        !           178:        int *count;
        !           179: {
        !           180:        int empty = 0;
        !           181: 
        !           182:        /*
        !           183:         * Body deleted.
        !           184:         */
        !           185:        if (!empty)
        !           186:                return (cp);
        !           187:        return (0);
        !           188: }
        !           189: 
        !           190: /*
        !           191:  * Remove the last character in the clist and return it.
        !           192:  */
        !           193: unputc(clp)
        !           194:        struct clist *clp;
        !           195: {
        !           196:        char c;
        !           197:        int s;
        !           198: 
        !           199:        s = spltty();
        !           200:        /*
        !           201:         * Body deleted.
        !           202:         */
        !           203:        splx(s);
        !           204:        return (c);
        !           205: }
        !           206: 
        !           207: /*
        !           208:  * Put the chars in the from queue on the end of the to queue.
        !           209:  */
        !           210: catq(from, to)
        !           211:        struct clist *from, *to;
        !           212: {
        !           213:        char c;
        !           214: 
        !           215:        while ((c = getc(from)) >= 0)
        !           216:                putc(c, to);
        !           217: }

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