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 06:29:34 dillon Exp $
  39  */
  40
  41 #include "ww.h"
  42 #include "tt.h"
  43 #include <errno.h>
  44
  45 /*
  46  * Buffered output package.
  47  * We need this because stdio fails on non-blocking writes.
  48  */
  49
  50 ttflush()
  51 {
  52         register char *p;
  53         register n = tt_obp - tt_ob;
  54
  55         if (n == 0)
  56                 return;
  57         if (tt.tt_checksum)
  58                 (*tt.tt_checksum)(tt_ob, n);
  59         if (tt.tt_flush) {
  60                 (*tt.tt_flush)();
  61                 return;
  62         }
  63         wwnflush++;
  64         for (p = tt_ob; p < tt_obp;) {
  65                 wwnwr++;
  66                 n = write(1, p, tt_obp - p);
  67                 if (n < 0) {
  68                         wwnwre++;
  69                         if (errno != EWOULDBLOCK) {
  70                                 /* can't deal with this */
  71                                 p = tt_obp;
  72                         }
  73                 } else if (n == 0) {
  74                         /* what to do? */
  75                         wwnwrz++;
  76                 } else {
  77                         wwnwrc += n;
  78                         p += n;
  79                 }
  80         }
  81         tt_obp = tt_ob;
  82 }
  83
  84 ttputs(s)
  85 register char *s;
  86 {
  87         while (*s)
  88                 ttputc(*s++);
  89 }
  90
  91 ttwrite(s, n)
  92         register char *s;
  93         register n;
  94 {
  95         switch (n) {
  96         case 0:
  97                 break;
  98         case 1:
  99                 ttputc(*s);
 100                 break;
 101         case 2:
 102                 if (tt_obe - tt_obp < 2)
 103                         ttflush();
 104                 *tt_obp++ = *s++;
 105                 *tt_obp++ = *s;
 106                 break;
 107         case 3:
 108                 if (tt_obe - tt_obp < 3)
 109                         ttflush();
 110                 *tt_obp++ = *s++;
 111                 *tt_obp++ = *s++;
 112                 *tt_obp++ = *s;
 113                 break;
 114         case 4:
 115                 if (tt_obe - tt_obp < 4)
 116                         ttflush();
 117                 *tt_obp++ = *s++;
 118                 *tt_obp++ = *s++;
 119                 *tt_obp++ = *s++;
 120                 *tt_obp++ = *s;
 121                 break;
 122         case 5:
 123                 if (tt_obe - tt_obp < 5)
 124                         ttflush();
 125                 *tt_obp++ = *s++;
 126                 *tt_obp++ = *s++;
 127                 *tt_obp++ = *s++;
 128                 *tt_obp++ = *s++;
 129                 *tt_obp++ = *s;
 130                 break;
 131         default:
 132                 while (n > 0) {
 133                         register m;
 134
 135                         while ((m = tt_obe - tt_obp) == 0)
 136                                 ttflush();
 137                         if ((m = tt_obe - tt_obp) > n)
 138                                 m = n;
 139                         bcopy(s, tt_obp, m);
 140                         tt_obp += m;
 141                         s += m;
 142                         n -= m;
 143                 }
 144         }
 145 }