usr.bin/window/ttoutput.c

   1 /*      $NetBSD: ttoutput.c,v 1.9 2009/04/14 08:50:06 lukem Exp $       */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)ttoutput.c  8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: ttoutput.c,v 1.9 2009/04/14 08:50:06 lukem Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <errno.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include "ww.h"
  48 #include "tt.h"
  49
  50 /*
  51  * Buffered output package.
  52  * We need this because stdio fails on non-blocking writes.
  53  */
  54
  55 void
  56 ttflush(void)
  57 {
  58         char *p;
  59         int n = tt_obp - tt_ob;
  60
  61         if (n == 0)
  62                 return;
  63         if (tt.tt_checksum)
  64                 (*tt.tt_checksum)(tt_ob, n);
  65         if (tt.tt_flush) {
  66                 (*tt.tt_flush)();
  67                 return;
  68         }
  69         wwnflush++;
  70         for (p = tt_ob; p < tt_obp;) {
  71                 wwnwr++;
  72                 n = write(1, p, tt_obp - p);
  73                 if (n < 0) {
  74                         wwnwre++;
  75                         if (errno != EWOULDBLOCK) {
  76                                 /* can't deal with this */
  77                                 p = tt_obp;
  78                         }
  79                 } else if (n == 0) {
  80                         /* what to do? */
  81                         wwnwrz++;
  82                 } else {
  83                         wwnwrc += n;
  84                         p += n;
  85                 }
  86         }
  87         tt_obp = tt_ob;
  88 }
  89
  90 void
  91 ttputs(const char *s)
  92 {
  93         while (*s)
  94                 ttputc(*s++);
  95 }
  96
  97 void
  98 ttwrite(const char *s, int n)
  99 {
 100         switch (n) {
 101         case 0:
 102                 break;
 103         case 1:
 104                 ttputc(*s);
 105                 break;
 106         case 2:
 107                 if (tt_obe - tt_obp < 2)
 108                         ttflush();
 109                 *tt_obp++ = *s++;
 110                 *tt_obp++ = *s;
 111                 break;
 112         case 3:
 113                 if (tt_obe - tt_obp < 3)
 114                         ttflush();
 115                 *tt_obp++ = *s++;
 116                 *tt_obp++ = *s++;
 117                 *tt_obp++ = *s;
 118                 break;
 119         case 4:
 120                 if (tt_obe - tt_obp < 4)
 121                         ttflush();
 122                 *tt_obp++ = *s++;
 123                 *tt_obp++ = *s++;
 124                 *tt_obp++ = *s++;
 125                 *tt_obp++ = *s;
 126                 break;
 127         case 5:
 128                 if (tt_obe - tt_obp < 5)
 129                         ttflush();
 130                 *tt_obp++ = *s++;
 131                 *tt_obp++ = *s++;
 132                 *tt_obp++ = *s++;
 133                 *tt_obp++ = *s++;
 134                 *tt_obp++ = *s;
 135                 break;
 136         default:
 137                 while (n > 0) {
 138                         int m;
 139
 140                         while ((m = tt_obe - tt_obp) == 0)
 141                                 ttflush();
 142                         if ((m = tt_obe - tt_obp) > n)
 143                                 m = n;
 144                         memmove(tt_obp, s, m);
 145                         tt_obp += m;
 146                         s += m;
 147                         n -= m;
 148                 }
 149         }
 150 }