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