usr.bin/window/ttoutput.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)ttoutput.c       8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/ttoutput.c,v 1.1.1.1.14.2 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/ttoutput.c,v 1.2 2003/06/17 04:29:34 dillon Exp $
  39  */
  40
  41 #include <errno.h>
  42 #include <string.h>
  43
  44 #include "ww.h"
  45 #include "tt.h"
  46
  47 /*
  48  * Buffered output package.
  49  * We need this because stdio fails on non-blocking writes.
  50  */
  51
  52 ttflush()
  53 {
  54         register char *p;
  55         register n = tt_obp - tt_ob;
  56
  57         if (n == 0)
  58                 return;
  59         if (tt.tt_checksum)
  60                 (*tt.tt_checksum)(tt_ob, n);
  61         if (tt.tt_flush) {
  62                 (*tt.tt_flush)();
  63                 return;
  64         }
  65         wwnflush++;
  66         for (p = tt_ob; p < tt_obp;) {
  67                 wwnwr++;
  68                 n = write(1, p, tt_obp - p);
  69                 if (n < 0) {
  70                         wwnwre++;
  71                         if (errno != EWOULDBLOCK) {
  72                                 /* can't deal with this */
  73                                 p = tt_obp;
  74                         }
  75                 } else if (n == 0) {
  76                         /* what to do? */
  77                         wwnwrz++;
  78                 } else {
  79                         wwnwrc += n;
  80                         p += n;
  81                 }
  82         }
  83         tt_obp = tt_ob;
  84 }
  85
  86 ttputs(s)
  87 register char *s;
  88 {
  89         while (*s)
  90                 ttputc(*s++);
  91 }
  92
  93 ttwrite(s, n)
  94         register char *s;
  95         register n;
  96 {
  97         switch (n) {
  98         case 0:
  99                 break;
 100         case 1:
 101                 ttputc(*s);
 102                 break;
 103         case 2:
 104                 if (tt_obe - tt_obp < 2)
 105                         ttflush();
 106                 *tt_obp++ = *s++;
 107                 *tt_obp++ = *s;
 108                 break;
 109         case 3:
 110                 if (tt_obe - tt_obp < 3)
 111                         ttflush();
 112                 *tt_obp++ = *s++;
 113                 *tt_obp++ = *s++;
 114                 *tt_obp++ = *s;
 115                 break;
 116         case 4:
 117                 if (tt_obe - tt_obp < 4)
 118                         ttflush();
 119                 *tt_obp++ = *s++;
 120                 *tt_obp++ = *s++;
 121                 *tt_obp++ = *s++;
 122                 *tt_obp++ = *s;
 123                 break;
 124         case 5:
 125                 if (tt_obe - tt_obp < 5)
 126                         ttflush();
 127                 *tt_obp++ = *s++;
 128                 *tt_obp++ = *s++;
 129                 *tt_obp++ = *s++;
 130                 *tt_obp++ = *s++;
 131                 *tt_obp++ = *s;
 132                 break;
 133         default:
 134                 while (n > 0) {
 135                         register m;
 136
 137                         while ((m = tt_obe - tt_obp) == 0)
 138                                 ttflush();
 139                         if ((m = tt_obe - tt_obp) > n)
 140                                 m = n;
 141                         bcopy(s, tt_obp, m);
 142                         tt_obp += m;
 143                         s += m;
 144                         n -= m;
 145                 }
 146         }
 147 }